JPS61131713A - Electric pot apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric water heater that is used for commercial or household purposes and is capable of supplying hot water at a high temperature in a short period of time.

2. Description of the Related Art Conventional Structures and Problems There are conventional electric water heaters of this type that extract coffee liquid or the like in a short time by applying pressure with a pump or the like.

Hereinafter, the conventional electric water heater as described above will be described with reference to the drawings.

FIG. 1 shows a conventional electric water boiler used for brewing coffee liquid, etc. In the figure, reference numeral 1 denotes a heater block, which consists of a block body 2, an upper cover 3, and a lower cover 4, and is made of a good thermal conductor such as aluminum. The block body 2 has a spiral water channel groove 6 on its surface.
, and a spiral heating element 6 is embedded in the back surface. Further, a through hole 7 is provided in the center thereof in communication with the water channel groove 5. Reference numeral 8 denotes a seal ring provided on the outer periphery of the block body 2, and an upper cover 3 is provided in a watertight manner to close the upper surface of the groove 6 to form a water channel 6a. The lower cover 4 is provided with a recess 10 having an opening 10a that communicates with the through hole 7 in a watertight manner through an O-ring 9, and the recess 10 includes a valve 11 for closing the opening 10a, and a valve 11. A valve spring 12 for urging is provided by screwing onto a valve seat 13. 14 is a diffusion plate screwed onto the valve seat 13 with mounting screws 15. Reference numeral 16 designates an electromagnetic pump, which connects a suction pipe 18 with one end open at the bottom of the water container 17 and a water channel 5a of the heater block 1 formed by the groove 5 of the block body 2 through the pump 16. Connecting pipe 1
9 is connected.

Reference numeral 20 denotes a hook plate with a central opening provided at the lower part of the lower cover 4, and around the central opening of this hook plate 2o, a plurality of claws 23 are provided around the upper end of the filter holder 22 equipped with a handle 21. A plurality of notches 2 into which the
4, and a plurality of retaining pieces 26 that engage with the claws 23 by rotation of the filter holder 22 after the claws 23 are loosely fitted. Reference numeral 26 indicates a filter housed in the filter holder 22, and reference numeral 2 indicates a seal backing that is engaged with the lower cover 4 and comes into airtight contact with the upper end of the filter 26. In addition, in the lower part of the filter holder 22, an outlet 28 is provided at the lower end of the tapered surface facing the center.

Reference numeral 29 is a receiving plate provided with a number of holes for placing a demitasse coffee cup 30 containing this type of coffee, and 31 is a receiving plate. Reference numeral 32 denotes an automatic temperature regulator that is attached to the block body 2 with its heat sensitive part in close contact with the block body 2;
2 detects the temperature of the heater block 1, limits the supply of electricity to the heating element 6, and controls the temperature of the heater block 1.

33 is coffee powder.

The operation of the electric water heater configured as described above will be described below.

First, fill the water container 17 with the required amount of water. Next, heating element 6
When energization is started, the temperature is controlled to a predetermined temperature by the automatic temperature controller 32 as shown in FIG. In FIG. 2, point A is the point where the automatic temperature regulator 32 operates for the first time, and heat is transferred from the heating element 6 to the block body 2, and further, in the process of heating the automatic temperature regulator 32, the initial It shows the appearance of a transient phenomenon in the heating state of , and it becomes a peak.

Next, the filter 26 placed in the filter holder 22
A predetermined amount of coffee powder 33 is placed inside and rotatably engaged with the hook plate 2o. The preparation for coffee extraction is now complete.

Next, when the demitasse coffee canope 30 is set on the receiving plate 29 which is almost directly below the outlet 28 of the filter holder 22 and the pump 16 is activated, the water in the water container 17 is pumped through the suction pipe 18, It is pumped into the block body 2 via the connecting pipe 19. The water pumped into the block body 2 is boiled by heat transfer from the heater block 1 while passing through the spiral water channel 5a, becomes hot water, passes through the through hole 7, presses the valve 11, and passes through. , diffuser plate 1
4, passes through the coffee powder 33, extracts the coffee liquid, and flows out from the outlet 28 to form a demi-mess coffee cup 3.
0 and the coffee is ready.

On the other hand, the temperature of the heater block 1 decreases as heat is taken away by the water. Then, the automatic temperature regulator 32 is activated to energize the heating element 6 again to raise the temperature of the heater block 1, and when it reaches a predetermined temperature, the automatic temperature regulator 32 is activated again.
2 operates to stop energizing the heating elements and maintain the temperature of the heater block 1 within a certain range. (Figure 2 Part B)
However, the above configuration has the following problems. First, since the power consumption of the heating element 6 is generally large, a high peak temperature as shown at point A in FIG.
Overall, it is unfavorable in terms of durability. Second, if water is injected into the water pipe 5a at this peak temperature, the water pipe 5a
It boils more than necessary in a and blocks the flow of water. Thirdly,
Generally, since the power consumption of the heating element 6 is large, the width of the section B in FIG. 2 is large, and the temperature of the hot water varies widely. This does not become smaller even if the mounting position of the automatic temperature cylinder 32 is changed, and on the other hand, if the power consumption is reduced, the width of section B in Figure 2 becomes smaller, but water can be heated to hot water in a short time. Therefore, there was a problem that hot water could not be obtained continuously.

OBJECTS OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide an electric water heating device with improved peak temperature control characteristics of the water heating unit.

Structure of the Invention In order to achieve the above object, the electric water boiler of the present invention has the following features:
A substantially cylindrical heating element, a substantially cylindrical water pipe located on the outer periphery of the heating element and having a spiral groove, and a heater block body located on the outer periphery of the water pipe and forming a spiral water channel together with the groove. a water heating unit comprising: a pressurized water injection means for injecting water into the water channel; a power reduction device that reduces the power of the heating element when the water heating unit is at a high temperature; It is configured with an automatic temperature controller that operates after the power reduction device operates. According to this configuration, when the temperature of the water boiling unit rises in the initial state, power consumption is reduced and the water heating unit is not used unnecessarily. In order to suppress the peak temperature, the durability of the special heating element in the water heating unit can be improved, and in order to suppress unnecessary boiling of water, the hot water flows smoothly in the water channel, reducing power consumption. In addition, since power consumption is reduced during stable conditions, the temperature rise of the water heating unit becomes more gradual, and as a result, the operation of the automatic temperature controller sufficiently follows the temperature rise of the water heating unit. Therefore, the fluctuation range of hot water temperature becomes smaller, and as a result,
It is possible to equalize the temperature of hot water.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 3 to 9, 41 is a base made of synthetic resin, and 42 is a bottom plate made of synthetic resin. The base 41 is fixedly supported. 45 is a synthetic resin water tank installed at the rear of the base 41;
An opening 46 is provided at the bottom of the pump 5, and this opening 46 is communicated with an inlet 49 of an electromagnetic pump 48 via a communication bushing 47. The pump 48 is attached to the base 41 via a vibration-proof rubber 5°. Reference numeral 61 denotes a water boiling unit, and this water boiling unit 51 includes a rod-shaped heater 62, a substantially cylindrical shape with a diameter of about 30 mm and a length of about 90 mm, and a spiral shape continuous from one end to the other end with a cross-sectional area on the outer periphery. Approximately 11 charges 2
A groove 53 is provided, and a groove 54 is provided at both ends of the groove 53, and a heat diffusion compound 55 containing silicon as a main component is filled between the heater 52 and the heater 52.
A water tube 66 is made of a good thermal conductor such as a copper alloy, and is formed into a substantially rectangular shape with a good thermal conductor such as die-cast aluminum, with a substantially cylindrical long hole ε7 in the center. The elongated hole 57iC of the heater block main body 58 accommodates a water pipe 56 equipped with an ○ ring 59 in the 0/g groove 54 at both ends thereof, and the inner wall 6o of the elongated hole 57 The groove 63 of the water pipe 56 forms a spiral water channel 61 in an airtight manner. In addition, the water pipe 5
6 is screwed onto the heater block main body 58 with a mounting screw 62.

Furthermore, the heater block main body 58 has an inlet 65 on the thick wall surface on the right side near the entrance of the long hole 57, to which an inversion valve 64, which communicates with the outlet of the pump 48 through a vibro 3 made of synthetic resin, is screwed. In addition, a spout 66 is provided on the thin wall surface on the bottom near the back of the elongated hole 67, so that the water channel 6
1 communicates airtightly from the inlet 65 to the outlet 66.

67 is a terminal plate welded to the lead wire 68 of the heater 52.

Reference numeral 69 denotes a first automatic temperature controller of a disc bimetal type, which is thermally provided by a stopper 70 by tightening the first screw 1 from the center of the right side of the thick wall surface of the heater block main body 58 toward the injection port 65. be. Reference numeral 2 is a laminated bimetal type second automatic temperature controller that is heat-sensitively mounted by tightening a second screw 73 from the center of the left side of the thick wall surface of the heater block main body 68 toward the spout 66. .

Further, a drainage lower 4 is provided on the left thick wall surface facing the injection port 66 near the entrance of the elongated hole 57 on the heater block main body 6, and a safety valve 76 is screwed onto the drainage lower 4. This safety valve 75 is connected to the heater block body 68.
The heater block main body 6
A rail 78 provided on a lever 77 that is slidable in the longitudinal direction of the lever 77 presses the operating valve 75a via a spring 75b to become in operation, and the pressure inside the water channel 6'1 increases abnormally, causing a predetermined pressure. When the pressure reaches , the operating valve 75a operates against the spring 75b to drain the water in the water channel 61 from the drain lower 4, thereby reducing the pressure in the water channel 61. In addition,
The safety valve 75 opens the water channel 61 when it is not pressed by the rail 78 and is not in operation.

Reference numeral 79 denotes a capsule base, and this capsule base 79 has a recess 8o in the center, and the recess 80 has a diameter of about 311 which penetrates downward in the center! The capsule base 79 has an I+1 dripping hole 81, and is made of aluminum die-casting or the like, and a capsule 83 in which coffee powder, etc. 82 is sealed.
It is intended to place 84 is a link made of a steel plate that is pressed by the lever 77 about the fulcrum 86 and converts the sliding movement of the lever 77 into clockwise rotation about the fulcrum 86. 86 is an edge portion of the link 84.

87 is slidably provided with a rod bar 88, and a shaft 89
, which is an elevating plate made of a stainless steel plate that is engaged with the link 84 and converts the rotational movement of the link 84 into a vertical movement. ing.

90 is located at the lower part of the heater block main body 58,
In addition, a stepped hole 93 is provided in the center, which is airtightly communicated with the spout 66 provided at the lower part of the thin wall surface of the heater block main body 58 through an Oj7/g 91, and has a wide stepped hole 93 with a female screw 92 provided at the lower part. This ring 90 has a stepped portion 94 at the top, and this ring 90 is attached to the heater block body 58 with a screw 9.
It is screwed in at 5. 96 is a holder, this holder 96
is integrally formed with the handle 7.6 using zinc die-casting or the like, and has a substantially cylindrical shape in which the ring 90 is housed, and further has an annular rib 97 at the top and a pair of claws 98 and a notch at the bottom. The annular lip 97 is engaged with the outer circumferential stepped portion 94 of the ring 90 to be rotatable. Reference numeral 10Q denotes a guide ring, and this guide ring 100 is located at the lower part of the ring 9°, and has a passage 102 in the center that communicates airtightly with the stepped hole 93 of the ring 9Q through an O-ring 101. A substantially conical storage portion 103 is provided to be stored inward, and a nozzle 104 with a needle-like tip directed downward is press-fitted into the lower part of the passage 102. Furthermore, this guide ring 1o○ is connected to the ring 9.
A male screw 105 is provided at the top to be removably screwed into the female screw 92 of the wide opening of the stepped hole 93. The nozzle 104 has a tapered needle tip, and is provided with a nozzle hole 106 in the center of the interior thereof, which branches off from the tip and opens on the tapered surface. Storage part 10 of ring 100
It opens into the capsule 83 housed in 3. Said ring 9
A valve spring 107 is formed in the space formed in the stepped hole 93 by screwing the male screw 105 provided at the upper part of the guide ring 100 into the female screw 92 of the lower wide opening of the stepped hole 93. , the step part of the stepped hole 93 is moved from the bottom to the top, that is, from the guide ring 100 side to the ring 9Q.
A side biased valve 108 is provided.

109 is a pair of hook plates, and this pair of hook plates 109
is provided with a locking portion 110 that engages and locks the claw 98 of the holder 94 when the capsule milt 9 moves upward together with the lifting plate 87 and the holder 96 rotates, and is integrated with the capsule stand 79. It was established specifically.

111 is a synthetic resin water tank lid, 112 is water tank 4
A drain cock 113 is a float switch for discharging the remaining water in the water tank 45.
When the amount of water inside decreases, the pump 48 is activated and the operation of the pump 48 is stopped. 114 is a saucer for storing the drain from the drain cock 112 and the used capsule 83; It is a pull-out type. 115 is a demitasse coffee cup,
116 is a receiving plate provided with a number of holes on which the demitasse coffee cup 11.5 is placed. 117 is a power switch, and 117a is a pump switch that operates the pump 48. 118 is a preheating lamp linked to the second automatic temperature controller 72.

Next, the main electric circuits will be explained. In FIG. 8, a diode 120, which is a half-wave rectifier, is connected in series with the second automatic temperature controller 72, and the first
automatic temperature regulators 69 are connected in parallel. Furthermore,
This parallel connection body and the heater 62 are connected in series. On the other hand, the pump 48 is connected to the first automatic temperature controller 69 and the second automatic temperature controller 7 via the pump switch 11roa.
2, a diode 119, and a heater 62, and connected to a power source 120 via a power switch 117 to form a circuit.

To explain the operation in the above configuration, the water tank lid 111
, fill the water tank 45 with water using a jug, and operate the power switch 117 to start energizing the heater 52. At this time, the first automatic temperature controller 69 and the second automatic temperature controller 72 are in a closed circuit state, and the heater 52 generates heat with a rated power consumption of about 1 KW. The generated heat is sequentially transferred to the water pipe 56 via the heat diffusion compound 56,
Further, since the temperature is transmitted to the block body 58, the temperature of the heater block body 58 rises, and when it reaches a predetermined temperature, the first automatic temperature regulator 69 is activated and becomes an open state.

The heater 52 is energized by the second automatic temperature controller 72.
Since this is carried out via the diode 119, a half-wave rectified current flows, and the power consumption of the heater 52 becomes 0.5 KW, which is half of the rated power consumption of 1 KW. FIG. 9 shows the temperature change of the water heating unit 51, where part A is the temperature rise curve from the start of electricity supply until the first automatic temperature controller 69 opens the circuit, and part B is the temperature rise curve when the power consumption reaches 0.5KW. This is the temperature rise curve after the temperature rise, and the slope of the temperature rise becomes gentler after the power consumption, that is, the heat generation capacity, decreases. Part 0 is the point at which the second automatic temperature regulator 72, which operates to open the circuit at approximately 105°C, operates, and the temperature of the water heating unit 51 at this time reaches approximately 120'C. Part D is the second automatic temperature controller 7 when electricity is continued without brewing coffee.
2 shows a state where the temperature is controlled by 2. Part E is the second
2 shows a temperature rise curve of the water heating unit 61 when only the cylinder 72 is used and electricity is supplied without connecting the diode 119, and corresponds to part A in FIG. 2.

The operating temperature of each automatic temperature controller alone is approximately 85°C0FF for the first automatic temperature controller 69, and approximately 70°C for the first automatic temperature controller 69.
CoN, and the second automatic temperature controller 72 is approximately 106°
C0FF is approximately 90°CoN. 1k The first temperature regulator 69 is activated approximately 40 seconds after the start of energization,
In conjunction with the operation of the first automatic temperature controller 72, the preheating lamp lights up to indicate completion of preparation for coffee extraction.

Next, set the capsule 83 on the capsule stand 79 and push the handle 76 forward to the right. A lever 77 slides in conjunction with the handle 76 and presses the link 84. This link 84 rotates clockwise about a fulcrum 85. The lift plate 87, which is slidably provided by a rod 88, is pushed upward on the shaft 89 by the clockwise rotation of the link 84, and a capsule integrally provided on the lift plate 87 is pressed upward by the clockwise rotation of the link 84. The locking portion 110 of the hook plate 109 passes through the notch 99 of the holder 96 and rises to a certain height. At this point, is the tip of the lever 77 linked to the knob 76? 11. In order to get over the edge portion 86 of the IJ link 84, even if the handle 76 is pushed further, the elevating plate 87 will not rise. Further, when the handle 76 is pushed forward to the right, the claw 98 of the holder 96 integrally provided on the handle 76 engages the locking portion 110 of the hook plate 109.
engage with. The capsule 83 set on the capsule stand 79 is stored inside the storage part 103 of the guide link 1o○, and at this point the capsule 83 is inserted into the nozzle hole 10 at the tip of the nozzle 104.
6 opens into the inside of the capsule 83.

Next, the demitasse coffee cup 115 is placed on the receiving plate 116. In this state, when the pump switch 117a is operated, the pump 48. is activated, and water flows into the suction port 49 of the pump 48 from the opening 46 at the bottom of the water tank 45 via the communication bushing 47.

Water pressurized by the pump 48 passes through the vibro 3 from the outlet of the pump 48, passes through the check valve 64, and enters the spiral waterway 61 from the inlet 66 of the heater block body 58.
flows into. The water heating unit 51 is approximately 90'C to 105'C.
°C (section D in Fig. 9), the water absorbs heat from the groove 53 of the water pipe 56 and the inner wall 60 of the block body 68 while flowing through the spiral waterway 61, and is heated to a temperature just before boiling. The water becomes hot and flows out from the spout 66. Water boiling unit 61
The hot water flowing out from the spout θ6 is energized through the stepped hole 93 at the center of the gage 90, and the pump 48 pumps about 9
Ring 9o due to being pressurized to Kg/crA
The hot water presses the stepped portion 94 of the stepped hole 93 of the guide ring 1, which is biased by the valve spring 1Q7 to close the valve 108.
It flows into the passage 102 at 0Q. Further, the hot water is ejected from the nozzle hole 106 of the nozzle 104 of the guide ring 100 into the coffee grounds 82 in the capsule 83 and becomes coffee liquid, and at the same time, the bottom of the capsule 83 is ruptured by the pressure from the pump 48, and the coffee liquid flows into the capsule base. The demi-female coffee cup 115 is dripped from the dripping hole 81 in the center of the recess 80 of the capsule stand 79 and placed on the receiving plate 116 below the capsule stand 79.
It is stored dripping inside.

On the other hand, the temperature of the water heating unit 61 decreases because the amount of heat is taken away by the water passing through the water channel 61. When the temperature of the hot water flowing out from the spout 66 drops to about 85°C, the temperature at a position near the spout 66 from the center of the left side of the thick side surface of the heater block main body 68 drops to about 90°C, and the second The automatic temperature controller 72 operates to close the circuit, and the diode 11
A current flows to the heater 52 through the heater 52, and the power consumption is 0.
The power becomes 5KW, and the temperature of the water heating unit 51 rises.

Water flows into the water channel 61 and takes away heat from the water heating unit 51, and while the temperature of the water heating unit 51 does not rise, the second automatic temperature regulator 72 continues to be energized and continues to provide heat to the water. When the pump 48 is stopped and water stops flowing through the waterway 61, heat is no longer absorbed by the water, so the water heating unit 5
14 increases, and when it rises to about 105° C., the second automatic temperature regulator 72 is activated to cut off the current and control the increase in the temperature of the water heating unit 51. Therefore, the second
The temperature of the hot water flowing out from the spout 66 is controlled to about 90'Q to about 98°C by the operation of the automatic temperature controller 72.

The coffee extraction time is about 30 seconds, and the amount of water flowing at that time is about 100 cc to 60 cc/30 seconds.

Furthermore, when a large amount of hot water is required to warm the demitasse coffee cup 115 or for other purposes, the same operation as for brewing coffee is performed without setting the capsule 83, and then the pump switch 117a is operated to turn on the pump 48. Activate. Due to the performance of the electromagnetic pump 48, there is no coffee powder that is a pressure load, so the amount of water pumped increases to approximately 300 cc per minute.
becomes. This is about 1.5 times the amount of water when using the capsule 83. Furthermore, if a large amount of hot water is required, the pump 48 must be operated continuously, and as a result, the water heating unit, Heat continues to be taken away by water, O, E5KW
The α heating capacity does not provide sufficient heating, and the water temperature is approximately 65°.
When the temperature drops to C, the first automatic temperature regulator 69 is activated and the circuit is closed, and as a result, the power consumption of the heater 52 becomes 1KW, the heating capacity increases, and the temperature of the water and the temperature of the water boiling unit 51 rise. do. When the temperature of the heater block main body 58 reaches approximately 85°C, the first automatic temperature regulator 69 operates again and becomes open, so the power consumption of the heater 52 returns to Q, 5KW, and in this case, The temperature of the hot water obtained is sufficiently high.

In the above circuit configuration, when the temperature of the water heating unit 61 rises in the initial state, the first automatic temperature regulator 6
9 and the half-wave rectifier 119 consisting of a first die, the power consumption is reduced by half, so firstly, the unnecessary temperature of the water heating unit 51 can be reduced, and second, the second In order to suppress the peak temperature at the time of the first operation of the automatic temperature controller 72 and reduce unnecessary boiling of water, the water channel 6
The hot water flows smoothly through the water heating unit 51, and as a result, power consumption is saved, making it economical.Furthermore, since the power consumption is halved when stable, the temperature of the water heating unit 51 rises slowly. Moreover, since the operation of the automatic temperature controller sufficiently follows the temperature rise of the water heating unit 61, the range of fluctuation in the temperature of the water heating unit 61 is small, and therefore the range of fluctuation in the temperature of the obtained hot water can also be reduced. It is possible.

FIGS. 10 and 11 show another embodiment of the present invention, in which the first automatic temperature controller 69 and the second automatic temperature controller 72, which are the detectors of the power reduction device, are integrated into one device. Thermistor 1
21 and an electronic circuit 12 using a microcomputer, etc.
2, and the diode 119 is used as a triac 113. In this case, one thermistor 121 is sufficient for temperature detection, and continuous variable power control such as phase control or short (turning ON and OFF to control the average power) using the triac 123 can be performed. It has the effect of creating micro-nodules of warmth.

In each of the above embodiments, the water pipe was constructed separately from the heater and heater block body, but the water pipe and the heater or heater block may be integrated, and the key point is that the water pipe is long enough for heat exchange. Although diodes and triacs were used to form a spiral waterway with It can be set to less than the electric power.

Furthermore, in each of the above embodiments, an electromagnetic pump was used as the pressurized water injection means, but the water tank may be positioned higher than the water heating unit and pressurized water injection may be used. It is sufficient if the flow velocity can be obtained.

Further, in the above embodiment, the first automatic temperature controller 6
9, second automatic temperature controller 72, and diode 119
The connection is made by connecting the second automatic temperature controller 72 and the diode 119 in series, as shown in FIG. 12(a).
The first automatic temperature controller 69 was connected in parallel to this series unit, but as shown in FIG. 12(b), the second automatic temperature controller element 2 and the diode 119 were connected in parallel, and this parallel unit The first automatic temperature controller 69 may be connected in series with the first automatic temperature controller 69, as shown in FIG. 12(C).
Instead, a three-terminal automatic temperature controller 124 is used, with a terminal 126 that is open when cold, a second automatic temperature controller 72, and a diode 119 connected in series, and another terminal 126 that is closed when cold. may be a circuit that short-circuits the second automatic temperature controller 72 and the diode 119;
The automatic temperature controller 69 switches between full-wave current and half-wave current, and the second automatic temperature controller 72 switches on half-wave current.
, 0FFK may be used for temperature control.

Effects of the Invention As is clear from the above embodiments, the electric water heating device of the present invention includes a substantially cylindrical heating element, a substantially cylindrical water pipe having a spiral groove located on the outer periphery of the heating element. , a water heating unit consisting of a heater block body located on the outer periphery of the water pipe and forming a spiral waterway together with the groove; a pressurized water injection means for injecting water into the waterway; and when the water heating unit is at a high temperature, a heating element The device is composed of a power reduction device that reduces the power of When the temperature of the water heating unit increases, power consumption is reduced and unnecessary peak temperatures of the water heating unit are suppressed, which improves the durability of the heating element in the water heating unit.
In addition, by suppressing unnecessary boiling of water, hot water flows smoothly through the water channel, which saves power consumption. The rise becomes gradual, and as a result, the automatic temperature controller's operation sufficiently follows the rise in the temperature of the water heating unit, so the range of variation in the temperature of the water heating unit becomes smaller, and as a result, the range of variation in the resulting hot water temperature is also smaller. In addition, even if the temperature of the water heating unit suddenly drops due to continuous pouring of hot water, the power consumption can be increased to almost the rated power consumption, so you can quickly get hot water. It has various effects such as:

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional electric water boiler, FIG. 2 is a diagram showing a temperature rise curve of a heater block of the same water heater, and FIG. 3 is a sectional view of an electric water boiler showing an embodiment of the present invention. , Fig. 4 is a partial sectional view of the same, Fig. 5 is an enlarged sectional view of the main part, Fig. 6 is an enlarged perspective view of the main part, Fig. 7 is an enlarged sectional view of the main part, and Fig. 8 is a main circuit of the same. 9 is a diagram showing the temperature rise curve of the electric water heating unit, FIG. 10 is an enlarged perspective view of the main parts of the electric water heating device showing another embodiment, FIG. 11 is a block diagram of the main parts, and FIG. 12 (a), (b), (C
) are circuit diagrams of the main parts of the water heating device. 48... Pump, 61... Water heating unit,
52...Heating element, 63...-Groove, 56-...Water pipe, 58...Heater block body, 61...
... Waterway, 69 ... First automatic temperature controller, 72
...Second automatic temperature controller, 119...Diode, 121...Thermistor, 122...
・Electronic circuit, 124...triac. Name of agent: Patent attorney Toshio Nakao and one other name
l Figure 2 A @ Time Figure 4 Figure 5 Figure 8 //7 Anchor Figure 9 Time poverty Figure 11 Figure 12 q ＼lq

Claims (2)

[Claims] (1) A substantially cylindrical heating element, a substantially cylindrical water tube having a spiral groove located on the outer periphery of the heating element, and a spiral water channel formed with the groove located on the outer periphery of the water tube. A water heating unit consisting of a heater block body, a pressurized water injection means for injecting water into the water channel, a power reduction device that reduces the power of a heating element when the temperature of the water heating unit is high, and a thermosensitive device provided in the water heating unit. and an automatic temperature controller that operates after the power reduction device operates. (2) The power reduction device includes a first automatic temperature controller and a half-wave rectifier, and the automatic temperature controller has a second automatic temperature controller whose operating temperature is higher than that of the first automatic temperature controller. the first automatic temperature controller and the second automatic temperature controller are provided in the block body, and while the first automatic temperature controller is closed, the first automatic temperature controller While the circuit in which the and heating element are connected in series is closed and the first automatic temperature controller is open, the second automatic temperature controller, the half-wave rectifier, and the heating element are connected in series. 2. The electric water boiler according to claim 1, wherein the electric water heater comprises a circuit configured to open and close the second automatic temperature controller.