JPH11155732A - Electric water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the temperature of stream discharged from a discharge port as low as possible by extending the length of a path from a steam generating source to the discharge port. SOLUTION: In the electric water heater having a vessel main body 1 having a container 3 to be heated by an electric heater 9 and a lid body 2 for the main body 1 of vessel, a stream discharge path 22 is installed for discharging steam S generated inside the container 3 to the outside, a detour flow passage 33 provided with second piping 35 to be a downward flow passage for downward guiding the steam S along with the main body 1 of vessel and third piping 36 to be an upward flow passage for upward guiding the steam derived from the second piping 35 is provided in the middle do the steam discharge path 22, a water receiving vessel 38 is freely attachably and detachably provided on the detour flow passage 33 while letting the lower ends of second and third piping 35 and 36 face it, and the steam S generated in the container 3 can be mixed with air through the detour flow passage 33 of the steam discharge path 22 and discharged to the outside after its temperature is lowered.

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, and more particularly, to an electric water heater having a function of lowering the temperature of discharged steam.

[0002]

2. Description of the Related Art In a well-known electric water heater, a liquid contained in a container body is heated and boiled and kept warm by an electric heater, and steam discharged from the container body at the time of the heating. Is discharged outside through a steam discharge passage formed in the lid.

[0003]

In the case of the above-described known electric water heater, since the steam discharge passage is formed in the lid, the length of the passage from the steam generation source to the outside outlet is increased. There was a structural constraint that it was difficult.

[0004] In the case of the above-mentioned known technique, since the path length from the steam generation source to the discharge port is short, the steam is kept at a high temperature from the discharge port during boiling (for example, at the time of initial boiling, re-boiling or descaling). If you accidentally put your hand near the outlet, you will feel hot.

[0005] The present invention has been made in view of the above points, and by increasing the length of a passage from a steam generation source to a discharge port, the temperature of steam discharged from the discharge port can be suppressed as low as possible. It is intended to do so.

[0006]

According to the basic structure of the present invention (invention of claim 1), a container body having an inner container heated by an electric heater and a container body are provided as means for solving the above problems. An electric water heater having a lid and a steam discharge passage for discharging steam generated in the inner container to the outside, and in the middle of the steam discharge passage, facing downward along the container body. While providing a bypass flow path consisting of a downward flow path for guiding steam and an upward flow path for guiding the vapor derived from the downward flow path upward, the lower end of the downward flow path and the upward flow path is provided in the bypass flow path. The facing water receiving container is provided detachably.

[0007] With the above configuration, the steam generated in the inner container is mixed with air in the bypass flow passage of the steam discharge passage, and is discharged to the outside after the temperature is reduced and a part of the dew is condensed. The Rukoto. Accordingly, the amount of discharged steam is reduced and the temperature is also significantly reduced, so that safety is improved.

When the downward flow path, the upward flow path, and the water receiving container are provided outside the container body as in the second aspect of the present invention, the downward flow path, the upward flow path, and the water receiving container are exposed to the outside air. Therefore, it is possible to promote a decrease in the temperature of the steam passing through the bypass flow path.

When the downward flow path, the upward flow path, and the water receiving container are provided between the outer case and the inner container in the container main body, the downward flow path and the upward flow path are provided. Since the space between the outer case and the inner container can be effectively used while being protected by the outer case, the outer dimensions of the container body can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment (Corresponding to Claims 1 and 2) FIGS. 1 to 10 show an electric water heater according to a first embodiment of the present invention.

As shown in FIGS. 1 and 2, the electric water heater has a container body 1 configured to accommodate a liquid (eg, water), and an opening and closing cover for covering an upper opening of the container body 1. A flexible lid 2 is provided.

The container main body 1 includes an inner container 3 made of metal (for example, stainless steel) forming an inner peripheral surface, an outer case 4 made of synthetic resin (for example, polypropylene) forming an outer peripheral surface, Synthetic resin (for example, polypropylene) that joins the upper edge of the inner container 3 and the upper edge of the outer case 4
And a bottom plate 6 made of synthetic resin (for example, made of polypropylene) that covers the lower end opening of the outer case 4.

The lid 2 is provided with a hinge pin 8 which is detachable from a hinge receiver 7 formed on the rear side of the shoulder member 5.
It is attached to open and close freely via.

On the lower surface of the bottom of the inner container 3, the inner container 3
An electric heater 9 for heating water stored in the inside is provided. Reference numeral 10 denotes a temperature sensor for detecting the temperature of the water contained in the inner container 3 (specifically, the temperature of the inner container 3), and 11 denotes that the heat of the electric heater 9 is not radiated downward. It is a heat shield plate to perform.

A liquid discharge passage 12 for discharging hot water in the inner container 3 to the outside is connected to the bottom of the inner container 3. The liquid discharge passage 12 is connected to the inner container 3. A space formed on the front side (that is, on the side opposite to the hinge pin) between the outer case 4 and the upper case 4 extends upward,
Faces a pipe cover portion 4a formed on the upper portion of the outer case 4. Reference numeral 14 denotes a water stop valve provided at the upper end of the liquid discharge passage 12.

An electric pump 15 for discharging liquid is interposed in a lower portion of the liquid discharging passage 12 (that is, a portion located in a space formed between the bottom of the inner container 3 and the bottom plate 6). (See FIG. 2).

As shown in FIG. 2, the upward straight pipe portion 12a in the liquid discharge passage 12 is
, And is provided at a position slightly closer to the side than directly below the, and a capacitance type liquid amount detecting means (not shown) is provided in the straight pipe portion 12a. The outer case 4 is provided with a liquid amount display section 16 for displaying the liquid amount detected by the liquid amount detecting means at a position slightly closer to the side than immediately below the spout 13. .

The lid 2 is made of an upper lid plate 17 made of synthetic resin.
And a lower lid plate 18 made of synthetic resin by welding at the outer peripheral portion by welding or the like. An inner lid plate 19 made of sheet metal is fixed to the lower surface of the lower lid plate 18 with screws 20. ing. A seal packing 21 for sealing the opening edge of the inner container 3 when the lid 2 is closed is provided on the outer peripheral portion of the inner lid plate 19.

The lower cover plate 18 is formed with a circular concave portion 23 having a substantially central portion recessed upward, and a substantially circular shape is formed between the lower cover plate 18 and the inner cover plate 19. The passage forming member 24 is clamped in a state of being inserted into the circular recess 23 from below. Reference numeral 25 denotes the passage constituting member 2
4 and a seal packing for sealing between the inner lid plate 19 and the lower lid plate 18.

A first steam chamber 2 for temporarily retaining steam S flowing from a steam inlet 26 formed in the inner cover plate 19 is provided between the passage constituting member 24 and the inner cover plate 19.
7 are formed. A second steam chamber 28 is formed between the passage forming member 24 and the circular recess 23 for temporarily retaining steam S flowing from a bypass flow path 33 described later. Further, an outlet 29 for the steam S is formed in the upper wall 23a of the circular concave portion 23, and a hanging wall 30 hanging from the lower surface of the upper lid plate 17 is provided above the edge of the outlet 29. It is pressed into contact with the seal packing 31. Further, at a position surrounded by the hanging wall 30 in the upper cover plate 17, a discharge port 32 serving as an outlet of the steam S to the outside is formed.

The first steam chamber 27 and the second steam chamber 28 communicate with each other via a bypass passage 33. The bypass passage 33 is connected to an outlet 34 formed on the upper surface of the passage member 24, and connects the second steam chamber 28 to the hinge pin 8.
A first pipe 35 bent horizontally slightly forward of the hinge pin 8 after passing horizontally through the side wall 24a of the passage component member 24 and the side wall 23b of the circular recess 23, and the first connection pipe. 35 is connected when the lid 2 is closed, and includes a second pipe 36 made of a stainless steel pipe or the like forming a downward flow path extending downward along the outside of the container body 1 (specifically, the outer case 4). And the second pipe 36, and communicates with the container body 1 (specifically,
A third pipe 37 made of a stainless steel pipe or the like forming an upward flow path extending upward along the outside of the outer case 4).
The third pipe 37 is connected to the lid 2 when the lid 2 is closed, and extends horizontally and substantially parallel to the first pipe 35 in a forward direction, and the side wall 23 b of the circular recess 23 and the side wall of the passage forming member 24. And a fourth pipe 38 penetrating the second steam chamber 28 through the second steam chamber 28.

The upper ends of the second pipe 36 and the third pipe 37 are fitted and fixed to the shoulder member 5, while the lower ends of the second pipe 36 and the third pipe 37 are used for storing dew water that is detachable from the container body 1. And the two are communicated via the water receiving container 39. A packing 40 is provided at the upper ends of the second and third pipes 36 and 37 for maintaining airtightness at the connection between the lid 2 and the first and fourth pipes 35 and 38 on the lid side. (See FIG. 7). The packing 40 has a large number of radial slits 41, 41,..., And the connection of the first and fourth pipes 35, 38 to the second and third pipes 36, 37 is easily maintained in an airtight state. You can do it.

As shown in FIG. 4, the upper surface 24b of the passage constituting member 24 is connected to an outlet 34 of the first steam chamber 27.
And the first pipe 3
A slight gap 42 is formed between the inlet-side end 35 a of the fifth and the outlet 34 of the first steam chamber 27. The gap 42
Is formed, the dew condensation water of the steam S flowing through the bypass passage 33 in the second steam chamber 28 is returned to the inner container 3 through the first steam chamber 27.

That is, in the present embodiment, the lid 2
When the lid is closed, the first steam chamber 27 and the first steam chamber 27
Pipe 35, second pipe 36, water receiver 39, third pipe 3
7, the outlet 3 via the fourth pipe 38 and the second steam chamber 28
2 is formed.

FIG. 9 and FIG.
As shown in FIG. 5, the engaging piece 44 protruding from the rear side is engaged with the engaging hole 43 formed in the outer case 4, and the elastic piece formed in the center of the upper end on the front side is cut out. The second pipe 3 is inserted into an engagement hole 48 formed in the piece 47.
6 and the outer case 4 so as to cover the outside of the third pipe 36.
By engaging a projection 46 protruding from the lower end of the cover 45 fixed to the outer case 4, the cover 45 is detachable from the outer case 4 which is the outer wall of the container body 1. Reference numeral 49 denotes an operation knob integrally formed with the elastic piece 47, and reference numeral 50 denotes a seal packing for maintaining airtightness between the water receiving container 39 and the cover 45.

In FIG. 1, reference numeral 51 denotes a steam discharge passage 2
A falling water stop valve 52 provided on the inlet side of 2 is a lock mechanism for maintaining the lid 2 in a closed state.

In the electric water heater configured as described above, the following operation and effect can be obtained.

When the water contained in the inner container 3 is heated and brought into a boiling state by energizing the electric heater 9, the inner container 3 is heated.
A large amount of steam S is generated inside. The steam S is supplied to the steam inlet 2
6 enters the first steam chamber 27 and then to the steam discharge passage 22
Pipe 35 and second pipe 3 that constitute the bypass flow path 33
6. In the course of passing through the third pipe 37 and the fourth pipe 38, the temperature is reduced by being mixed with low-temperature air, and a part of the steam S is condensed. Is done. Accordingly, the temperature of the steam S discharged to the outside is low and the amount thereof is small, and the safety is improved. Moreover, in the present embodiment, since the second pipe 36 serving as a downward flow path, the third pipe 37 serving as an upward flow path, and the water receiving container 39 are provided outside the container body 1,
The temperature of the steam S passing through the bypass passage 33 can be reduced in temperature. In addition, although the dew condensation water accumulates in the water receiving container 39,
At an appropriate time, the water receiving container 39 may be removed from the container body 1 and the accumulated dew water may be discarded.

If the amount of generated steam is reduced by controlling the amount of electricity supplied to the electric heater 9 to perform intermittent boiling or reduce the amount of electricity supplied immediately before boiling, the steam is discharged from the outlet 32. The amount of steam is further reduced, which is more effective.

Second Embodiment (Corresponding to Claims 1 and 2) FIGS. 11 and 12 show an electric water heater according to a second embodiment of the present invention.

In this case, an outer case 4 constituting the outer wall of the container body 1 is composed of a substantially cylindrical body member 4a made of sheet metal and a bottom member 4 made of synthetic resin joined to the lower end of the body member 4a.
b, and the second pipe 36 and the third pipe 37 constituting the downward flow path and the upward flow path in the bypass flow path 33 are formed in a space 5 between the body member 4 a and the inner container 3.
3. The second pipe 36 and the third pipe 3
7 is attached to the shoulder member 5 to maintain the airtightness between the first pipe 35 and the second pipe 36 and the third pipe 3.
The airtightness between the seventh pipe and the fourth pipe 38 is maintained by a trumpet-shaped seal packing 54 fixed to the upper ends of the second pipe 36 and the third pipe 37.

The water receiving container 39 is provided with the body member 4a.
Is removably housed in a concave portion 55 formed by recessing the space portion 53 side. Reference numeral 56 denotes a seal packing for maintaining airtightness between the water receiving container 39 and the body member 4a, and reference numeral 57 denotes a seal packing for maintaining airtightness between the second pipe 36 and the third pipe 37 and the upper surface 55a of the recess 55. It is.

With the above configuration, the downward flow path 36
The upward flow path 37 is protected by the outer case 4 (specifically, the body member 4a), and the space 53 between the outer case 4 (specifically, the body member 4a) and the inner container 3 is formed. Since it can be used effectively, the outer dimensions of the container body 1 can be reduced.

The other configuration, operation, and effect are the same as those in the first embodiment, and the description is omitted.

[0036]

According to the invention of the present application (the invention of claim 1),
In a container body having an inner container heated by an electric heater, and an electric water heater having a lid of the container body,
A steam discharge passage for discharging steam generated in the inner container to the outside is provided, and in the middle of the steam discharge passage, a downward flow path for guiding steam downward along the container body and a downward flow path are derived from the downward flow path. An inner flow path comprising an upward flow path that guides upwardly directed steam, and a water receiving container in which the lower end of the downward flow path and the lower end of the upward flow path are detachably provided. The steam generated in the above is mixed with air in the bypass flow path of the steam discharge passage so as to lower the temperature, so that part of the discharged steam is discharged to the outside after dew condensation, and the amount of discharged steam As a result, there is an excellent effect that the temperature is lowered and the safety is improved.

When the downward flow path, the upward flow path, and the water receiving container are provided outside the container body as in the second aspect of the present invention, the downward flow path, the upward flow path, and the water receiving container are exposed to the outside air. Therefore, it is possible to promote a decrease in the temperature of the steam passing through the bypass flow path.

[0038] When the downward flow path, the upward flow path, and the water receiving container are provided between the outer case and the inner container in the container main body as in the invention of claim 3, the downward flow path and the upward flow path are provided. Since the space between the outer case and the inner container can be effectively used while being protected by the outer case, the outer dimensions of the container body can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a cross section of a part of the electric water heater according to the first embodiment of the present invention.

FIG. 3 is a plan view of a second steam chamber in the electric water heater according to the first embodiment of the present invention, as viewed from above.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 3;

FIG. 6 is an enlarged exploded perspective view of a main part of a container body and a lid in the electric water heater according to the first embodiment of the present invention.

FIG. 7 is an enlarged plan view of inlet and outlet openings of first and second pipes in the electric water heater according to the first embodiment of the present invention.

FIG. 8 is a rear view in which a part of the electric water heater according to the first embodiment of the present invention is sectioned.

FIG. 9 is an enlarged sectional view of a water receiving container part in the electric water heater according to the first embodiment of the present invention.

FIG. 10 is an enlarged front view of a water receiving container part in the electric water heater according to the first embodiment of the present invention.

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

FIG. 12 is an enlarged sectional view of a water receiving container part in the electric water heater according to the second embodiment of the present invention.

[Explanation of symbols]

1 is a container body, 2 is a lid, 3 is an inner container, 9 is an electric heater, 22 is a steam discharge passage, 26 is a steam inlet, and 27 is a first
A steam chamber, 28 is a second steam chamber, 32 is an outlet, 33 is a bypass flow path, 34 is a first pipe, 35 is a second pipe, 36 is a third pipe, 37 is a fourth pipe, and 38 is a water receiving container. .

Claims (3)

[Claims] An electric water heater comprising a container body having an inner container heated by an electric heater and a lid of the container body, wherein steam generated in the inner container is discharged to the outside. A steam discharge passage is provided, and in the middle of the steam discharge passage, a downward flow path that guides steam downward along the container body and an upward flow path that guides steam derived from the downward flow path upward. An electric water heater, wherein a water receiving container facing the lower end of the downward flow path and the lower end of the upward flow path is detachably provided in the bypass flow path. 2. The electric water heater according to claim 1, wherein the downward flow path, the upward flow path, and the water receiving container are provided outside the container main body. 3. The electric water heater according to claim 1, wherein the downward flow path, the upward flow path, and the water receiving container are provided between an outer case and an inner container in the container body.