JPS627231Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electric water heater configured to heat water in a container and then keep it at a predetermined temperature.

Conventional structure and problems Generally, tap water contains chlorine called chlorine, inorganic ions, trihalomethane, which is said to be carcinogenic, and carbon dioxide gas.
If these substances are not removed from hot water used for coffee, tea, etc., the taste will deteriorate significantly and there is a risk of health problems. This limescale, trihalomethane, carbon dioxide gas, etc. are removed when the water is boiled, so it is desirable to use a water heater with a boiling function.

Therefore, a separate passage for steam from the container is provided,
A bimetal non-returnable boiling detection switch and a reset member are installed at the spout at the tip of the passage, and these are surrounded by a protective cover with a steam window.
Some manual reset type thermostats are attached to the container wall and directly connected to a reset member that protrudes outside the main body using a connecting plate, but this complicates the structure, increases costs, and makes it difficult to clean the passageway. Another problem was that it was difficult to assemble the container and the outer case (main body). In addition, conventional models have a water inlet on the front due to their construction, but due to the waterproof insulation of the reset member and the mounting position of the steam vent window, many of them have the reset member at the rear of the main unit, but it is difficult to operate. Needless to say, it is better to provide the section near the front of the main body for ease of use.

In addition, conventional manual reset thermostats have the characteristic of being difficult to restore, but if the environmental temperature drops abnormally, for example when the lid is opened while keeping warm, the switch will automatically restore and turn on again. Boiling may accelerate the deterioration of the durability of the resin and rubber materials that make up the body, and the operating temperature of the thermostat may change if mechanical operations are frequently applied directly to the bimetallic part of the thermostat immediately after the thermostat is turned off. There were problems with durability.

Purpose of the invention This invention solves the above-mentioned problems.
The object of the present invention is to provide a vapor detection structure that is easy to assemble, has high reliability, and is highly durable.

Structure and operation of the device In order to achieve the above object, the present invention includes a cylindrical container with a bottom, a heating element that heats the liquid contained in the container, an outer case that covers the outer periphery of the container, and an opening. a lid body equipped with a steam passage covering the container; a manually reset type thermostat mounted on the upper wall surface of the container so that the sensing surface faces the inner surface of the container; The configuration is such that a reset member having a return knob is attached separately. With this configuration, when the liquid in the container is heated by the heating element and boils, and the container is filled with steam, the temperature of the sensitive surface of the thermostat rises rapidly, causing the thermostat to operate. After operation, the thermostat is kept at a predetermined temperature, but if you want to boil it during use or when refilling with water, press the reset knob to turn on the thermostat again and repeat the above action. In addition, the temperature detection part is attached to the container side, and the reset member is attached separately to the outer case side, so they can be assembled individually.
This can be done simply by setting the outer case onto the main body.

Furthermore, the thermostat has a built-in reversing plate that automatically opens when the temperature reaches a certain level, and when it closes, operates only by external pressure, so even if the lid is opened, the thermostat will not operate.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described based on the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a cylindrical outer case, with a spout 2 fixed at its upper opening and a base 3 mounted at its lower end. Reference numeral 4 denotes a handle rotatably attached to both outer sides of the spout 2.

Reference numeral 5 denotes a lid which can be opened and closed over the spout 2, and is constructed so that it can be opened and removed from the spout 2 by pressing a lock knob 6 provided on its front surface.

Reference numeral 7 denotes a bottomed cylindrical container housed in the outer case 1. On the outer surface of the bottom of the container 7 is a heating element which integrally forms a main heating element 8 and an auxiliary heating element 9 by laminating insulating plates on top and bottom. is built in with a strong pressure bond between the bottom surface of the inner container 7 and a heat diffusion plate 10 and a back plate 11 made of a metal with good thermal conductivity such as aluminum or copper.

A heat shield plate 12 is provided below the heating element. At the center of the lower surface of the bottom of the container 7, there is a second thermostat 13 that detects the dry firing state by the temperature rise of the container and cuts off the power supply to the heating elements 8 and 9, and a temperature control for keeping warm that controls the auxiliary heating element 9. The container 14 is held in close contact. At the upper opening 7a of the side wall of the container 7, there is a first manual return type that detects steam and controls the main heating element 8.
A thermostat 17 is held in close contact with the heat insulating member 15 and a seal packing 70. Here, the operating temperature of the second thermostat 13 is the same as that of the first thermostat 13.
The thermostats 13 and 17 are set higher than the boiling point, and both thermostats 13 and 17 are connected in series. Reference numeral 18 denotes a display plate, and a reset member 20 having a reset knob 19 is provided opposite to the reset portion 21 of the first thermostat 17, so that the reset operation can be performed from the front.

The reset member 20 resets the first thermostat 1
The outer case 1 faces the reset portion 21 of 7, the display plate 18 is inserted into the through holes 22 and 23 formed by the display plate 18. The side that protrudes outward from the display plate 18 is the return knob 19 part, and the side that protrudes inward is the reset bar 24 part. It consists of an annular flange 25 provided at a suitable location approximately in the center. This annular flange 25 is pressed against the annular rib 27 on the inside of the display board 18 with a spring material 26, and a locking tool 28 that passes through the reset bar 24 and restricts the movement of the reset bar 24 is secured to the display board 18 with a screw 29. ing. An annular convex portion 30 is formed around the display plate 18 of the return knob 19 projecting outward, and the display plate 18 engages with a claw hole 32 in the outer case 1 with a claw 31 provided below, and the upper end is screwed. (not shown) is fixed to the outer case 1. The display plate 18 and the spout 2 are attached by forming the upper end surface 33 of the display plate 18 into a substantially L-shape 35 so as to engage with the inner surface 34 of the spout 2.
At the same time, the upper end surface 36 of the outer case 1 is also bent into a substantially L-shape 38 so as to engage with the inscribed surface 37 of the spout 2.

A heat shielding cover 41 made of resin or the like is removably attached to the inner surface of the container 7 of the heat insulating member 15, and has a steam vent hole 39 in the center and a drip hole 40 for dew on the side. 42 is an inner lid that is removably placed on the opening of the container 7, and has an air hole 4 approximately in the center.
3 and a steam chamber 45 having a communication hole 44.
Furthermore, a valve chamber 46 containing an overturning outflow valve 52 is provided below. Then, a screw 49 is attached to a support frame 48 formed of a stainless steel plate or the like and provided with an opening 47.
The inner lid packing 50 provided around the support frame 48 is used to airtightly attach the inner lid packing 50 to the container 7. Reference numeral 51 denotes a water rising pipe extending from the valve chamber 46 to the bottom of the container 7, and a spouting pipe 54 whose upper end extends outside the container 7 and has a spout 53 opening downward at its tip. and a valve chamber 46.

The lid body 5 has a cylindrical portion 55 with an open top surface in the upper center portion, and a push plate 56 that is vertically slidable is provided inside the cylindrical portion 55. The bellows 57 can be compressed against a spiral spring 58 built into the bellows 57 housed below the push plate 56. The bellows 57 is integrally provided with the lid cover 69 in a sealed manner, and a check valve 59 is provided on the top of the bellows 57.
A steam hole 60 at the upper end of the bellows 57 is arranged with a certain gap secured by a spiral spring 58, and an air jet hole 61 is provided at the lower part.

Further, there is a steam passage 63 hermetically formed around the periphery between the protective plate 62 and the steam passage 63, which is connected to an exhaust hole 64 of the lid body 5. 65 is a lid packing that connects with the bellows 57.

66 is a manual return type first thermostat 17
The reversing plate built in is molded into almost the same shape as the dish-shaped bimetal 67, and is reversed or restored only by pressure to open or close the switch contact 68.

In the configuration of this embodiment, when power is supplied to the heating elements 8 and 9 after filling the container 7 with water below the rated capacity, the water in the container is heated and begins to boil, and the container 7
A large amount of steam is suddenly generated inside the thermostat, and the temperature of the sensitive surface of the first thermostat 17 rises rapidly.When it reaches the operating temperature, it is activated and the power supply to the main heating element 8 is cut off. . Thereafter, the auxiliary heating element 9 is controlled by the temperature regulator 14, which is set at a slightly lower temperature than the first thermostat 17, to keep the water temperature constant. At this time, since the first thermostat 17 has a built-in reversing plate 66 that automatically opens the circuit when the temperature reaches a certain temperature, and operates only by external pressure when closing the circuit, is removed and the opening of the container 7 becomes open, and even if the temperature drop inside the container 7 becomes large, it will not return automatically.

If you want to boil the water again during use or when refilling, press the return knob 19.
Reversing plate 66 built into the first thermostat 17
is restored, the switch contact is turned on, power is supplied to the main heating element again, and boiling occurs.

Reset section 21 of first thermostat 17
To align the reset member 20 having the return knob 19, align the approximately L-shaped portion 35 of the upper end surface 33 of the display plate 18, which is engaged and fixed to the outer case 1, with the spout 2.
At the same time, the approximately L-shaped portion 38 of the upper end surface 36 of the outer case 1 is also engaged with the inner surface 37 of the spout 2, and the lower end is fixed with the base 3. Therefore, it is easy to assemble and can be easily aligned. Furthermore, since the reset bar 24 is restricted from moving by the locking tool 28 as when the return knob 19 is operated, a reliable reset operation can be performed.

Furthermore, even if water accidentally overflows from the opening of the spout when pouring water, the annular flange 25 provided approximately in the center of the reset member 20 is pressed against the annular rib 27 on the inside of the display panel 18 by the spring material 26. Overflowing water will not enter through the reset member 20. In addition, since an annular protrusion 30 is formed around the display plate 18 of the return knob 19, overflowing water is diverted around the annular protrusion 30 and drips down the main body, making the waterproof insulation reliable. It becomes expensive.

When steam is generated, the steam enters through the opening 47 of the support frame 48 and flows through the communication hole 44 of the inner lid 42 and the steam chamber 4
5, through the air hole 43, and then through the air outlet 61 and the inside of the bellows 58 as shown by the arrow A.
The steam enters the steam passage 63 through the steam hole 60 of the check valve 59 and is released to the outside of the main body through the exhaust hole 64 of the lid 5 .

When pouring out the liquid in the container 7, when the push plate 56 is pushed downward, the check valve 59 is first pushed downward and enters the bellows 57, closing the steam hole 60. When pressed further, the air in the bellows 57 passes through the air outlet 61, the air hole 43 of the inner lid 42, the steam chamber 45, and the communication hole 44, and then enters the container 7 from the opening 47 of the support frame 48.
The liquid is pumped out of the main body due to the increase in internal pressure.

Effects of the invention As is clear from the above description of the embodiments, in the present invention, the temperature detection part is installed separately on the side of the container containing the liquid, and the reset member is installed separately on the side of the outer case that covers the outer periphery of the container (1). The units around the container and outer case can be assembled individually, and the assembly work is simplified because it is only necessary to set the outer case unit on the main body and attach the board.

(2) The annular flange of the reset member having the return knob is pressed against the annular rib on the inside of the display board using a spring material, and the reset member is held by a locking device that restricts the movement of the reset bar, so waterproof insulation is achieved. A reset member with excellent operability can be obtained.

(3) Therefore, since the reset member can be disposed on the front surface of the main body, the electric water heater can be made even more convenient to use.

Further, since the generated steam is discharged upward by providing a steam passage inside the lid, water droplets will not drip onto the reset member.

(4) Manual reset type thermostats have a built-in reversing plate that automatically opens when a certain temperature is reached, and when closed, operates only by external pressure, so it is not affected by external temperature changes. without any
Since reliable operation is performed only by operating the reset member, not only can we provide a highly reliable steam detection type electric water heater, but also
It can be made to have excellent durability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric water heater according to an embodiment of the present invention, and FIG. 2 is a sectional view of the lid of the same water heater.
FIG. 3 is a sectional view of the same essential part. 1... Outer case, 2... Spout, 5... Lid, 7
...Container, 8...Main heating element, 9...Auxiliary heating element,
13...Second thermostat, 14...Temperature regulator for keeping warm, 17...First thermostat, 1
8... Display plate, 19... Return knob, 20... Reset member, 24... Reset bar, 39... Steam vent, 42... Inner lid, 54... Output pipe, 5
6... Push plate, 57... Bellows, 61... Steam outlet.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical container with a bottom, a heating element that heats the liquid contained in the container, an outer case that covers the outer periphery of the container, and a lid that covers the opening. a manual reset thermostat mounted on the upper wall surface of the container so that its sensing surface faces the inner surface of the container; and a reset knob having a reset knob on the outer case side facing the manual reset thermostat. Electric water heater with parts installed. (2) The manual reset type thermostat has a built-in reversing plate that automatically opens when the temperature reaches a certain temperature and operates only by external pressure when the circuit is closed. Electric water heater.