JP3063571B2 - Electric water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater which heats and keeps a liquid contained in a container and discharges the liquid outside the container.

[0002]

2. Description of the Related Art Conventionally, this type of electric water heater is shown in FIG.
And as shown in FIG. Hereinafter, the configuration will be described.

As shown in FIG. 1, a body 1 constitutes an outer portion and contains a container 3 for containing a liquid 2 therein.
The exterior part 4 has the container 3 placed in the central opening. The heating element 5 heats the liquid 2 and is fixed to the bottom of the container 3. 6 is a lid, 7a is a tapping pump, 7b is a circulation pump, 8a is a tapping path, 8b is a circulation path, one of the tapping paths 8a leads to the case 9 in the exterior part 4, and the other tapping pump 7a.
Is in communication with One of the circulation passages 8b communicates with a filter 11 having a water quality adjusting function attached to the inner surface of the container 3 via a connecting member 10 attached to the container 3, and the other communicates with the circulation pump 7b.

A control valve 12 is provided inside the case 9 to control the amount of hot water of the liquid 2 discharged by the hot water pump 7a. The control valve 12 is urged upward by a valve spring 13 and normally has a tapping path 8a,
The outlet 14 for leading the liquid 2 to the outside is in a shut-off state.
Above the control valve 12, an operation knob 15 attached to the exterior unit 4 is urged upward by a knob spring 16, and the case packing 1 mounted on the case 9 by external operation.
The control valve 12 is slidable downward through the control valve 7. The switch 18 operates in conjunction with the operation knob 15 to control the operation of the tapping pump 7a.

The operation of the above configuration will be described. When the operation knob 15 is pressed by an external operation, the operation knob 15
Is pushed downward against the urging of the knob spring 16, and in conjunction therewith, the switch 18 is operated to drive the tapping pump 7a to draw out the liquid 2 in the container 3 into the tapping path 8a. When the operation knob 15 is further pressed, it comes into contact with the control valve 12 via the case packing 17 and the control valve 1
2 slides downward against the bias of the valve spring 13.
In this state, the opening between the tapping path 8a and the spout 14 is released by the opening provided in the control valve 12 to establish a communication state, and the liquid 2 in the container 3 drawn out by the tapping pump 7a.
Passes through the opening of the control valve 12 through the hot water channel 8a and is led out of the spout 14 to the outside.

When the pressing operation of the operating knob 15 is stopped and the pressing force is reduced, the operating knob 15 is pushed upward by the urging of the knob spring 16, and accordingly the control valve 12 is attached to the valve spring 13. The spring slides upward due to the force, and finally the tapping path 8a and the spout 14 are shut off by the control valve 12, and the outflow to the outside is stopped. When the pressing force is further reduced, the operation knob 15 is turned on by the switch 1.
The operation of the tapping pump 8a is stopped by operating the hot water pump 7a by abutting the nozzle 8 and the discharge of the liquid 2 in the container 3 is completed.

On the other hand, when the temperature of the liquid 2 in the container 3 reaches a predetermined temperature, the circulation pump 7b is driven for a predetermined time to draw out the liquid 2 to the circulation path 8b, and the connecting member 10 attached to the container 3 is connected. By passing the water through a filter 11 having a water quality adjusting function attached to the inner surface of the container 3 through the filter, an effect of improving water quality is obtained.

[0008]

However, in the above-mentioned conventional structure, two drive pumps, that is, a hot water pump 7a and a circulation pump 7b, are required, so that the number of parts is increased and the cost is increased. There is a problem that the arrangement is complicated because of the arrangement inside, and the assemblability is not good.

To solve this problem, a hot water pump 7
a and the circulating pump 7b are combined, and the drive is controlled by one pump to switch the hot water supply and circulation flow paths inside the case. During the circulation, the liquid is drawn out to the spout side and heated. There has been a problem that the high-temperature liquid leaks out of the main body and causes burns.

Further, since the structure for shutting off the circulation side at the time of tapping operation is complicated and unstable, the circulation port does not reach a completely closed state, and a predetermined maximum tapping amount is obtained by returning a small amount of liquid into the container. There was a problem that it could not be obtained.

Further, when the operation knob is pressed without intention to supply hot water during the circulation, there is a problem that the high-temperature liquid in the circulation suddenly flows out of the main body through the opening of the control valve to cause a burn. Was.

The present invention solves the above-mentioned conventional problems.
It is intended to be safe, to significantly reduce the number of parts and production costs, and to improve assemblability.

[0013]

According to the present invention, in order to achieve the above object, a body constituting an outer portion, an exterior portion mounted on an upper portion of the body, and a liquid contained in the body. A container, a heating element that adheres to the container and heats the liquid, a lid that covers an upper opening of the container, a pump that draws the liquid in the container, and a liquid that is drawn out by the pump in the exterior part. A case comprising a tapping-side case for pouring water to the outside and a circulation-side case returning to the inside of the vessel, a tapping path connecting the pump and an inlet formed in the circulation-side case, and a circulation-side case. A shaped circulation port and a bypass for short-circuiting the container, and a tap hole and a drain hole for communicating the circulation side case and the tapping side case inside the case are formed; Normally at the outlet A slidable control valve for closing the tap hole and variably opening the tap port while changing the circulation port to the closed state at the time of tapping is provided by biasing with a valve spring, and is provided in the drain hole. The first means for solving the problem is that a check valve for closing the drain hole at all times is provided.

A second aspect of the present invention is that the control valve of the first means for solving the problem is provided with a valve packing which is always in contact with a tap hole on the outer periphery of the control valve and is in contact with a circulation port at the time of tapping. I have.

[0015] A third problem-solving means is that the inside surface of the tap hole to which the control valve provided with the valve packing of the second problem-solving means abuts is formed in a tapered shape.

The fourth problem-solving means is that the cross-sectional area of the circulation port of the first to third problem-solving means is ensured to be equal to or larger than the cross-sectional area of the tapping path.

The fifth problem-solving means is that the height difference between the circulation port and the drainage hole of the first to third problem-solving means is ensured to be equal to or larger than the inner diameter of the tapping path.

The sixth problem-solving means is that the drainage holes of the first to third problem-solving means are arranged upstream of the position of the circulation port.

A seventh aspect of the present invention is that a partition is provided between the circulation port and the drain hole of the first to third aspects of the present invention.

In addition, the length of the flow path connecting the circulation port and the drain hole of the first to third means for solving the problem is ensured to be longer than the flow path length between the inflow port of the circulation side case and the circulation port. This is referred to as eighth means for solving the problem.

A ninth problem solving means is that a flow path connecting the circulation port and the drain hole of the first to third problem solving means is formed in a maze shape.

A tenth problem-solving means is that the internal volume of the tapping-side case of the first to third problem-solving means is secured to be equal to or more than the internal volume of the circulation-side case.

[0023]

According to the first aspect of the present invention, there is provided:
Normally, the control valve opens the bypass path side to form a circulation path between the tapping path and the inside of the container.In this state, when a liquid such as water is heated and reaches a predetermined temperature, the pump is driven to drive the liquid. Is forcedly circulated, and the calcium component contained in the liquid evaporates, so that the odor of the calcium can be reduced.
In addition, at the time of tapping, the tap can be opened by opening the tap with the flow path switching function of the control valve and closing the circulation port.

According to the second means for solving the problem, a valve packing is provided on the outer periphery of the control valve which is always in contact with the tap hole and is in contact with the circulation port at the time of tapping, so that the tap port is securely closed during circulation. And the circulation port can be reliably closed at the time of tapping.

According to the third means for solving the problem, the closed state of the tap hole during circulation is further ensured by forming the tap hole inner surface portion to which the control valve equipped with the valve packing comes into contact with in a tapered shape. It can be.

Further, by the fourth means for solving the problem, by ensuring the cross-sectional area of the circulation port equal to or larger than the cross-sectional area of the tapping path, the circulating liquid does not fill the inside of the circulation side case, and the control valve and the tapping port are connected. The liquid can be prevented from reaching the abutting portion.

Further, the fifth problem-solving means ensures that the height difference between the circulation port and the drain hole is equal to or larger than the inside diameter of the tap hole, so that the circulating liquid can be prevented from reaching the drain hole.

According to the sixth means for solving the problem, by disposing the drain hole upstream of the circulation port, the circulating liquid passes through the circulation port first, so that the circulating liquid passes through the circulation port. To the drainage hole.

According to the seventh means for solving the problem, by providing a partition wall between the circulation port and the drainage hole, the circulating liquid does not flow out to the drainage hole but to the circulation port having a low flow path resistance. Can be derived.

Also, by means of the eighth means for solving the problem, by ensuring the length of the flow path connecting the circulation port and the drain hole to be equal to or greater than the flow path length between the inflow port and the circulation port of the circulation side case, Even if the circulating liquid flows out to the drain hole, the possibility of reaching the drain hole can be reduced.

Further, by forming a flow path connecting the circulation side case and the drainage hole in a maze shape by the ninth problem solving means, the circulating liquid may flow out to the drainage hole. However, because the flow velocity decreases due to the resistance of the maze-shaped flow path,
The possibility of reaching the drain hole can be further reduced.

Further, by means of the tenth problem solving means, the operation knob is operated during circulation by securing the internal volume of the tapping-side case equal to or larger than the internal volume of the circulation side case, and the interlocked switch stops the circulation of the pump. Even if the circulating liquid is led out of the opening of the control valve and the tap hole to the tapping side case until the completion of the control process, the derived hot liquid is stored inside the tapping side case and It can be prevented from being poured out.

[0033]

1 to 3 show a first embodiment of the present invention.
This will be described with reference to FIG.

As shown in the figure, the body 21 constitutes an outer portion, and contains a container 23 containing a liquid 22. The exterior part 24 has the container 23 mounted on the central opening. The heating element 25 heats the liquid 22,
It is fixed to the bottom part. 26 is a lid, 27 is a pump,
Reference numeral 28 denotes a tapping path, reference numeral 29 denotes a case, which comprises a tapping side case 29a and a circulation side case 29b. One of the hot water paths 28 communicates with an inflow port 29 c formed in a circulation side case 29 b in the exterior part 24, and the other communicates with a pump 27.

The circulation port 30 formed in the circulation side case 29b
Is connected to a connecting member 32 attached to the container 23 via a bypass path 31, and is short-circuited through a filter 33 having a water quality adjusting function attached to the inner surface of the container 23. Inside the case 29, there is provided a tap hole 34 and a drain hole 35 for making the tap side case 29a and the circulation side case 29b communicate with each other. The tap hole 34 is normally closed in the tap hole 34, At the time of tapping, a slidable control valve 36 that variably opens the tapping port 34 while changing the circulation port 30 to the closed state is urged by a valve spring 37. In normal times, the tapping path 28 The outlet 38 for leading the liquid 22 to the outside is in a shut-off state.

The drain hole 35 is provided with a check valve 39 which normally closes the drain hole 35 and returns to the circulation side case 29b when residual liquid is present in the tapping side case 29a. Above the control valve 36, an operation knob 40 attached to the exterior unit 24 is urged upward by a knob spring 41, and the control valve 36 can be slid downward through a case packing 42 by an external operation. The switch 43 works with the operation knob 40 to control the operation of the pump 27.

The operation of the above configuration will be described. When the operation knob 40 is pressed by an external operation, the operation knob 40
Is pushed downward against the bias of the thumb spring 41, and the switch 43 is operated in conjunction with the downward movement, so that the pump 2
7 is driven to draw out the liquid 22 in the container 23 into the tapping path 28. When the operation knob 40 is further pressed, it comes into contact with the control valve 36 via the case packing 42 and the control valve 36
Slides downward against the bias of the valve spring 37. In this state, the opening between the hot water supply path 28 and the spout 38 is released by the opening provided in the control valve 36 to establish a communication state, and the liquid 2 in the container 23 discharged by the pump 27 is released.
2 passes through the opening of the control valve 36 through the hot water path 28,
Hot water can be discharged from the outlet 38 to the outside.

When the pressing operation of the operating knob 40 is stopped and the pressing force is reduced, the operating knob 40 is pushed upward by the urging of the knob spring 41, and accordingly the control valve 36 is attached to the valve spring 37. The spring slides upward by the force, and finally the tapping path 28 and the spout 38 are shut off by the control valve 37, and the tapping to the outside is stopped. When the pressing force is further reduced, the operation knob 40 is switched to the switch 43.
Then, the drive of the pump 27 due to the contact operation is stopped, and the discharge of the liquid 22 in the container 23 is terminated.

On the other hand, in the state shown in FIG.
When the liquid 22 in the inside reaches a predetermined temperature, the pump 27 is driven for a predetermined time and the liquid
Since the tap hole 34 is kept closed by the control valve 36 urged by the valve spring 37, the circulation side case 29
b, passes through the bypass passage 31 through the circulation port 30 and is led out of the connecting member 32 attached to the container 23 to the filter 33 having a water quality adjusting function attached to the inner surface of the container 23, so that the water quality improving effect is obtained. Obtainable.

When the operation knob 40 is depressed during the circulation, the switch 43 associated therewith stops driving the pump 27 after a predetermined processing time, and the liquid 22 is temporarily discharged for safety. Interrupted.

As described above, according to the present embodiment, normally, the control valve 36 opens the bypass passage 31 side, and a circulation passage is formed between the tapping passage 28 and the inside of the container 23. When the liquid 22 such as is heated and reaches a predetermined temperature, the pump 27 is driven to forcibly circulate the liquid 22, the calcium component contained in the liquid 22 evaporates, and the odor of calcium can be reduced. Further, by providing a control valve 36 having a function of switching the hot water circulation flow path of the liquid 22 inside the case 29, a single pump 27 can serve both for hot water and for circulation. Can be greatly reduced, and the structure can be simplified, so that the assemblability can be improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, the control valve 44 is provided with a valve packing 45 on its outer periphery. At all times (when the tapping operation is not performed), as shown in FIG. 4, it comes into contact with tap hole 34, and at the time of tapping, as shown in FIG. 5, it comes into contact with circulation port 30.

With this configuration, since the tap hole 34 can be reliably closed during circulation, it is possible to prevent the liquid 22 from leaking to the tap side case 29a through the minute gap between the control valve 44 and the tap port 34. Further, at the time of maximum tapping, the valve packing 45 can reliably close the circulating port 30 by abutting on the circulating port 30, so that the liquid 22 led out from the pump 27 is guided to the tapping-side case 29a to the maximum extent, and the Can stably obtain the maximum amount of hot water.

Next, a third embodiment of the present invention will be described with reference to FIG. The components having the same configuration as the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, the inner surface of the tap hole 46 with which the control valve 44 to which the valve packing 45 is attached comes into contact is formed in a tapered shape.

With this configuration, the closed state of the tap hole 46 during circulation can be further ensured, so that the leakage of the liquid 22 to the tap side case 29a is further avoided, and the outflow to the outside is prevented. be able to.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, the cross-sectional area A of the circulation port 30 is ensured to be larger than the cross-sectional area B of the tapping path 28.

With this configuration, the circulating liquid 22 is led out to the bypass passage 31 through the circulation port 30 having a small flow path resistance, so that the liquid 22 does not fill the circulation side case 29b and the control valve It does not reach the contact portion between 44 and tap hole 46. Therefore, even if a minute gap exists in the contact portion between the control valve 44 and the tap hole 46, it is possible to prevent the liquid 22 from leaking into the tapping side case 29a.

In the above-described embodiment, the control valve 44 is provided with a valve packing 45 on the outer periphery and the inner surface of the tap hole 46 is formed in a tapered shape. The packing 45 may not be provided, and the inner surface of the tap hole 46 may not be formed in a tapered shape.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, the circulation port 30 and the drain hole 3
5 is secured to the inner diameter B of the tapping path 28 or more.

With this configuration, the circulating liquid 22 does not reach the drain hole 35, and the leakage of the liquid 22 to the tapping side case 29a that may occur in the drain hole 35 can be avoided.

In the above embodiment, the control valve 44 is provided with a valve packing 45 on its outer periphery and the inner surface of the tap hole 46 is formed in a tapered shape. The packing 45 may not be provided, and the inner surface of the tap hole 46 may not be formed in a tapered shape.

Next, a sixth embodiment of the present invention will be described with reference to FIG. The same components as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG.
It is arranged upstream from the position of 0.

With this configuration, since the circulating liquid 22 passes through the circulation port 30 first, it is returned to the container 23 through the bypass path 31 via the circulation port 30. Therefore,
Leakage of the liquid 22 into the tapping-side case 29a that can occur in the drain hole 35 can be further avoided.

In the above embodiment, the control valve 44 is provided with a valve packing 45 on its outer periphery and the inner surface of the tap hole 46 is formed in a tapered shape. The packing 45 may not be provided, and the inner surface of the tap hole 46 may not be formed in a tapered shape.

Next, a seventh embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, the circulation port 30 and the drain hole 3
5, a partition 47 is provided. With this configuration, the circulating liquid 22 is guided to the circulation port 30 having a smaller flow path resistance than the drain hole 35 having a larger flow path resistance. Therefore, leakage of the liquid 22 to the tapping-side case 29a which may occur in the drain hole 35 can be further avoided.

Next, an eighth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, the circulation port 30 and the drain hole 3
5 is ensured to be equal to or greater than the flow path length between the inflow port 29c of the circulation side case 29b and the circulation port 30.

With this configuration, the circulating liquid 22 is guided to the circulation port 30 having a shorter flow path than the drain port 35 having a longer flow path. Therefore, leakage of the liquid 22 to the tapping-side case 29a which may occur in the drain hole 35 can be further avoided.

Next, a ninth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, the flow path connecting the circulation side case 29b and the drain hole 35 is formed in a maze shape.

With this configuration, the circulating liquid 22 is guided to the circulation port 30 having a smaller flow path resistance than the drain hole 35 having a larger flow path resistance. Therefore, it is possible to further avoid leakage of the liquid 22 to the tapping side case 29a that may occur in the drain hole 35. Next, a tenth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, the internal volume V1 of the tapping side case 29a is ensured to be equal to or larger than the internal volume V2 of the circulation side case 29b.

With this configuration, the liquid 22 is discharged to the tapping side case 29a before the operation knob 40 is pressed during circulation and the interlocking switch 43 completes the drive stop control of the pump 27. Also, the liquid 22 is sufficiently stored in the tapping side case 29a, and is not suddenly led out from the spout 38.

[0070]

As described above, according to the present invention, a tap hole and a drain hole for communicating the circulation side case and the tapping side case are formed inside the case. A slidable control valve for closing the tap and variably opening the tap while changing the circulation port to the closed state when tapping is provided by urging with a valve spring, and the drain hole is provided in the drain hole. Since a check valve that normally closes the drainage hole is provided, by providing a control valve having a function of switching the hot water circulation flow path, the control valve normally opens the bypass path side to allow a space between the hot water path and the inside of the container. When a liquid such as water is heated and reaches a predetermined temperature in this state, the pump is driven to forcibly circulate the liquid, and the calcium component contained in the liquid evaporates, and The odor can be reduced, and it is The hot water outlet can be opened by opening the tap hole and the circulation port can be closed by the valve channel switching function, so that one drive pump can be used for tapping and circulation, so the number of parts and production cost Can be greatly reduced, and the structure can be simplified, so that the assemblability can be improved.

Further, since the control valve is provided with a valve packing which is always in contact with the outer periphery of the tap hole and is in contact with the circulation port at the time of tapping, the tap hole is reliably closed during circulation so that the high-temperature liquid is removed. Since there is no outflow to the outside and the circulation port can be reliably closed at the time of tapping, a predetermined tapping amount can be obtained, and safety and performance can be ensured.

Further, since the inner surface of the tap hole to which the control valve with the valve packing comes in contact is formed in a tapered shape, the closed state of the tap hole during circulation can be further ensured and safety is improved. be able to.

Further, since the cross-sectional area of the circulation port is ensured to be larger than the cross-sectional area of the tap hole, the circulating liquid does not fill the inside of the circulation side case, and the contact portion between the control valve and the tap port is formed. Since the liquid does not reach, the outflow of the high-temperature liquid to the outside can be further avoided, and safety can be improved.

Further, since the height difference between the circulation port and the drainage hole is made larger than the inner diameter of the tapping channel, the circulating liquid does not reach the drainage hole, so that the high-temperature liquid flows out to the outside. Can be avoided and safety can be improved.

Further, since the drain hole is disposed upstream of the position of the circulation port, the circulating liquid passes through the circulation port first, so it is led out to the bypass path side through the circulation port, and is discharged to the drain hole. Therefore, the outflow of the high-temperature liquid can be avoided, and safety can be improved.

Further, since a partition wall is provided between the circulation port and the drain hole, the circulating liquid does not flow out to the drain hole, but is led out to the circulation port having a low flow path resistance, so that the liquid is reliably introduced into the container. It is possible to prevent the liquid that has been returned and becomes high temperature from flowing out, and it is possible to improve safety.

Also, since the length of the flow path connecting the circulation port and the drain hole is made longer than the flow path length between the inflow port of the circulation side case and the circulation port, the liquid in circulation should be prevented. Even if the liquid flows toward the drain hole, the possibility of reaching the drain hole can be reduced, and the outflow of the high-temperature liquid to the outside can be avoided, and the safety can be improved.

Further, since the flow path connecting the circulation port and the drain hole is formed in a maze, even if the circulating liquid flows out toward the drain hole, the flow path in the maze is formed. Since the flow velocity is reduced due to the resistance, the possibility of reaching the drain hole can be further reduced, the outflow of the high-temperature liquid to the outside can be avoided, and the safety can be improved.

Further, since the internal volume of the tapping-side case is secured to be equal to or greater than the internal volume of the circulation-side case, the operation knob is operated during the circulation, and the interlocking switch performs the control process of stopping the circulation of the pump. Even if the circulating liquid is drawn out to the tapping-side case through the opening of the control valve and the tapping hole until completion, the derived hot liquid is stored inside the tapping-side case. Therefore, it is possible to avoid a sudden outflow of the high-temperature liquid to the outside, thereby ensuring safety.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electric water heater according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the electric water heater in a state of circulating a liquid in a container.

FIG. 3 is an enlarged cross-sectional view of a main part of the electric water heater in a state where a liquid in a container is discharged.

FIG. 4 is a sectional view of a main part of a state in which the liquid in the container of the electric water heater according to the second embodiment of the present invention is circulated.

FIG. 5 is a cross-sectional view of a main part in a state where the liquid in the container of the electric water heater is discharged.

FIG. 6 is a sectional view of a main part of an electric water heater according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a main part of an electric water heater according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a main part of an electric water heater according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view of a main part of an electric water heater according to a sixth embodiment of the present invention.

FIG. 10 is a sectional view of a main part of an electric water heater according to a seventh embodiment of the present invention.

FIG. 11 is a sectional view of a main part of an electric water heater according to an eighth embodiment of the present invention.

FIG. 12 is a sectional view of a main part of an electric water heater according to a ninth embodiment of the present invention.

FIG. 13 is a sectional view of a main part of an electric water heater according to a tenth embodiment of the present invention.

FIG. 14 is a cross-sectional view of a conventional electric water heater.

FIG. 15 is an enlarged sectional view of a main part of the electric water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Body 22 Liquid 23 Container 24 Exterior part 25 Heating element 26 Lid 27 Pump 28 Hot water path 29 Case 29a Hot water side case 29b Circulation side case 29c Inflow port 30 Circulating port 31 Bypass path 34 Hot water port 35 Drain hole 36 Control valve 37 Valve spring 39 Check valve

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Morimoto 7-6 Tonoshimacho, Kadoma-shi, Osaka Excel Techno Co., Ltd. (56) References JP-A-3-106313 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) A47J 27/21 101

Claims (10)

(57) [Claims] 1. A body constituting an outer part, an exterior part mounted on an upper part of the body, a container for containing a liquid inside the body, and a heating element fixed to the container and heating the liquid. A lid for covering the upper opening of the container, a pump for drawing out the liquid in the container, and a return side case for discharging the liquid drawn out by the pump to the outside in the exterior portion and returning to the inside of the container. A case comprising a circulation side case, a hot water supply path connecting the pump and an inlet formed in the circulation side case, and a bypass path short-circuiting the circulation port formed in the circulation side case and the vessel. A water outlet and a drain hole for making the circulation side case and the hot water side case communicate with each other are formed inside the case, and the water outlet is normally closed at the water outlet, Time changes the circulation port to the closed state A slidable control valve for variably opening a tap hole while being urged is provided by a valve spring, and a check valve for always closing the drain hole is provided in the drain hole. Electric water heater. 2. The electric water heater according to claim 1, wherein the control valve is provided with a valve packing that is always in contact with an outer periphery of the control valve and is in contact with a circulation port during tapping. 3. The electric water heater according to claim 2, wherein an inner surface portion of the tap hole to which the control valve provided with the valve packing comes into contact is formed in a tapered shape. 4. The electric water heater according to claim 1, wherein a cross-sectional area of the circulation port is secured to be equal to or larger than a cross-sectional area of the tapping path. 5. The electric water heater according to claim 1, wherein a height difference between the circulation port and the drain hole is ensured to be equal to or larger than the inner diameter of the tapping path. 6. The electric water heater according to claim 1, wherein the drain hole is disposed upstream of the position of the circulation port. 7. The electric water heater according to claim 1, wherein a partition is provided between the circulation port and the drain hole. 8. The apparatus according to claim 1, wherein a length of a flow path connecting the circulation port and the drain hole is ensured to be equal to or greater than a flow path length between the inflow port of the circulation side case and the circulation port. An electric kettle according to claim 1. 9. The electric water heater according to claim 1, wherein a flow path connecting the circulation port and the drainage hole is formed in a maze shape. 10. The electric water heater according to claim 1, wherein the internal volume of the tapping-side case is secured to be equal to or larger than the internal volume of the circulation-side case.