JPS5935748A - Tap controlled electric water heater - Google Patents

Abstract

PURPOSE:To utilize the rapid heating performance by using a thin type space heater having small heat capacity, accelerate the rising of hot-water supplying temperature by forming a shell type heat exchanger having small water containing capacity, and perform securely preventing the device from heating without water at low setting temperature by urging a heat sensing part of a thermostat to a surface plate composing a heat exchanger. CONSTITUTION:A thermostat 41 is screwed to a heat transfer fitment 40 soldered on a heat exchanger 31a, as its heat sensing part is fixed by pressure. The heat exchangers 31a, 31b are formed as shell type having large water passing capability and small water containing capacity, that is, the heat exchangers 31a, 31b are formed by facing surface plates 43 composed of each two steel plates, and by soldering those periphery parts. Meanwhile, a space heater 32 composed of mica boards 53, 53' and heat generating body 48 is tied to a casing with press fitment.

Description

[Detailed Description of the Invention] What is the industrial application of the present invention? Electric tar with lL thermal heater! 4 water heater (related to C).

The structure of the conventional example and its problems The conventional electric instantaneous water heater was constructed in parallel as shown in the figure. That is, 1. ``i water mother, arrange the sheathed heaters 2a, 2b in this watertight 1, and make the watertight 1ζ by brazing the ends of these sheathed heaters 2m, 2b to watertight 1.
By holding it, a heat exchanger 3 is constructed. 4 is a water inlet pipe, and this inlet water f#4 is connected to the adjustment pulp 6 and the main valve 6.
f: Connected to the heat exchanger 3 via. 7 is a tap water pipe, and 8 is a pressure switch, which is attached to the actuator surface of the pressure switch 8 by pressure. In addition to the above-mentioned components, this electric instant water heater also includes b
Although it does not have an output selector switch, indicator light, and cane/gu, its electrical circuit diagram is shown in Figure 2. .

In FIG. 2, the sheathed heater 2d has a capacity of IKW, and the sheathed heater 2b has a capacity of 2KW.
The output of the heater is 1-iC) KW, 1KVy.

Switching is possible with stage A of 2KW and 3KW. 11a.

11b is Neo/Rap, and this Neo/Rag 11a.

Reference numeral 11b displays the output form S. Further, a pressure switch 8 and a thermostat 9 are connected to the cam switch 10.

Although the above-mentioned configuration is a general configuration of an electric instantaneous water heater, a flow rate switch may be used instead of the pressure switch 8 in some cases.

Next, we will explain how it works by connecting the water inlet t4 of the above-mentioned conventional heater to the water pipe and connecting it to the water heater. Thermal output of total required external output K, J kn
L, next, when the main valve 6 is fully opened, water enters the light blue 1 at a flow rate of M at the opening degree 1, water is supplied from d4 to fL, and is discharged from the outlet pipe 7. At the same time, the pressure switch 8 is turned on by the water pressure of light blue 1, and the heater and neon lamp are turned on by 41 m. Since the heater 7 generates heat as it passes, the amount of water coming out of the outlet 7 gradually rises and becomes saturated due to the correlation between the water flow 1 and the heat generation output. %1M
P reaches here. Next, when the main valve 6 is closed, the hot water is stopped, and at the same time, the pressure switch 8 is turned off, and the passage to the /-Z heater and Neo 7 lamp is stopped. Furthermore, if the temperature of the light blue 1 rises excessively due to a failure of the pressure switch 8, the thermostat 9 is turned off and the electric circuit is disconnected, so that dry heating of the light blue 1 can be prevented.

In addition, it is used to previously adjust the vI4 regulated pulp 61d maximum water flow lid.

In general, the performance of electric instantaneous boilers is important: they have good heat exchange efficiency, they rise quickly after the start of hot water taping, that is, they start up quickly, and the hot water temperature during taping is excessive. The water rises to a boiling point and boils, the temperature rises after the hot water tap is stopped, that is, the water in the light blue water almost boils due to after-boiling, it is possible to prevent dry heating, and there is no leakage due to insulation deterioration.

However, in the above conventional configuration, the heat exchanger 3
has a relatively large amount of water, and the 7-Z heaters 2a, 2
Since the flow rate of water passing through the surface of b is relatively low, the temperature difference between the sheathed heaters 2a and 2b and the water becomes large, and as a result, the temperature rise after the start of hot water tap is slow, and the temperature rise after the hot water tap stops, i.e. There was a problem in that the hot water in the water outlet 1 did not reach boiling point due to post-boiling.

Figure 3 8. Is b the conventional one width? ? In the conventional example shown in Fig. 3, δ, b (・), the hot water pipe 13 and the 7-piece heater 14 are wound around the iceberg 12 in a 2N key shape and brazed. It constitutes a heat exchanger iAg51cs, and the water flow μ is 16tg! Valve 17° Main valve 1a
u! Passage 19. Water can 12. Hot water pipe 13° out η′? 720
They are formed by connecting them in this order. 21 knee x, q three horns, switch, actuator 21a 'ii beak k
T-There is. 22. Gas heater 14 and hot water pipe 13
The brazed heat fittings and 224 heat transfer devices are placed in the 62nd field so as to be crimped with 222; the next is the thermostat. Note that electric circuit 1-1 in this conventional example.
．． 7 heaters: 7 heaters: single, and the others were the same as in Figure 1, which was unprecedented in Figure 2 (・Tsu-Ki・Ra] path).
Therefore, illustration and explanation will be omitted.

-th- The effect of conventional +1ili is as follows. That is, the external output of the heater 14 is mainly transferred to the hot water 113, and the other part is transferred to the light blue 12 (
I'm being told. First, preheat the water to light blue.

In addition, since the hot water pipe 13 passes rapidly through a long and narrow water passage, the water can rises rapidly. Therefore, this third
In the embodiments shown in Figures a and b, the initial hot water temperature rises quickly after water flow starts, and the problem of after-boiling can be solved, but the preheating water width in the rice field 12 is saturated at the hot water temperature number. Is it a problem that it takes a long time to change? had. In addition, since the temperature of the outer surface of the heat exchanger 16 is higher than the temperature of the output I8, there is a tendency for more thermal failure to occur.
Since it is necessary to set the temperature at a high temperature, it is difficult to prevent the hot water from drying out during continuous pouring. And again/-
Since the heater 14 is brazed over almost the entire length of the light blue 12, a special R is required in the manufacturing process to prevent insulation deterioration.

Purpose of the Invention In view of the above-mentioned conventional problems, the present invention has good heat exchange efficiency, and the hot water temperature rises quickly after the start of dispatch.
To provide an electric instantaneous water heater that has less afterburning, can reliably prevent dry heating, and does not require a special manufacturing process to prevent deterioration. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention includes a plurality of 7L-shaped heat exchangers with a high passing flow rate and a small amount of retained water, a space heater, and a thermostat, and a space heater and a thermostat. The heat exchanger is constructed by arranging two blood plates facing each other and fixing the peripheral edges of the face plates, and crimping the entire surface of the space heater between the plurality of heat exchangers. The heat-sensitive part of the thermostat is held in pressure contact with the face plate that makes up the entire heat exchanger. Utilizing rapid heating properties, and having UEJH* on the entire surface of the space heater and the face plate of the heat exchanger, the temperature difference between the space heater and the heat exchanger can be reduced by 2, and the heat exchanger has a is large and has a small amount of water retained/L-shaped
In addition to improving the temperature, the rise of the output 11i%m is also faster, and there is less after-boiling.Furthermore, the thermostat has a heat-sensitive part in pressure contact with the face plate that makes up the heat exchanger, so it is sure to prevent dry firing at a low set temperature. It has various excellent features, such as being able to carry out various operations, and furthermore, requiring no special arrangement in the manufacturing process to prevent insulation deterioration of the heater.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Figures 4a and 4b show an embodiment of the electric instantaneous water heater of the present invention, in which 31M and 31b are a plurality of heat exchangers, 3
2 is a space heater, and this space heater 32 is fastened to a cane puffer (not shown) with a holding metal fitting (not shown).

In addition, the water passage is at the water inlet 33. Conditioned pulp 34. Main pulp 3
5. Water inlet pipe 36. Communication chamber 37 and the heat exchanger 31a
, 31b and the outlet pipe 38 are connected in this order. It has a 39iJ pressure swing and is equipped with an actuator 39a.

Reference numeral 4o denotes a heat transfer fitting that is brazed to the heat exchanger 31a, and the heat transfer fitting 40 (24.) is pressed so that the entire heat sensitive part of the thermostat 41 is crimped.

42 is a cam switch that switches between the heat output and the space heater 32Q. The electric circuit according to the embodiment of the present invention described above is similar to the conventional example shown in FIG.

5th Shija, B is the same electricity - heat sexual intercourse in Kagifutsu clan? x
〇Part of it? This is a cross-sectional view of the ware 31a, 3.
1b has a large amount of water passing through and retains 4;. small/
It is an L type, that is, the special exchanger 31a, 3
1bi'': LfI made of two copper plates
With the hair 43 facing each other:) i7i #If part is row (-j is to do (it is more composed than that. ; With the width wall board, cut the two face plates 43 and solder with 1 width f" 1% and 5th Aa l: As shown, cut 1 piece alternately on the left and right sides. Mouth the notch 45,
Six lines Oij! A waterway 46 is formed. A slit 47 is provided between the machine exchangers 531a and 3Ib, and the slit 47 is large enough to allow the space heater 32 to be inserted therein.

Figure ge shows the configuration of the atbi-h space heater 32, where 48 is a heating element made of a thin nichrome plate, and this heating element 48 is arranged in a serpentine shape so that the heat generation of 2KW and 1KW has the same watt density. will be established. 49a, 49
b, 49c are 4.b and 49c of the heating element 48. ,,! In the contact Vc4 Teito, which was formed by extending the
, a9c are sandwiched together by an auxiliary conductor 5o made of a thin brass plate, and finned with tomes 51a, 51b, and 61c, and the a part is all spot welded. 52a, 62
b.

62c is connected to auxiliary conductor 6o 4'gd'9''+49b
*Screw through hole provided to pass through 49c, 53°6
Reference numeral 3' denotes a mica plate pasted on both sides of the heating element 48, and these mica plates 63 and 63' have their inner surfaces coated with a viscous filler having P resistance and insulating properties, and then bonded together. These mica plates 63 and 53'! The self-heating element 48 constitutes a space heater 32 that is thin and has all the necessary functions.

The operation of the configurations shown in FIGS. 4a, b to 6a, b will be explained. First, the cam switch 42 adjusts the heat output of the space heater 32 to the required 8 outputs, tN, and then the raw valve 36 is opened, water starts flowing, and the pressure switch 39 is turned on and turned on by the actuator 39m. , space heater 32KJ! ! 17IL is done. By energizing the space heater 32, the heat exchanger 3
The water passing through 1a and 3Ib is exchanged, and the hot water string coming out of the hot water tap 38 rises widely and eventually reaches the saturation temperature. This saturation temperature can be arbitrarily selected depending on the hot water i and the thermal output. Looking at this heat transfer, firstly, since the space heater 32 is a shoulder type, the temperature rises quickly, and the space heater 32/
'iThat whole surface f! : Since a plurality of heat exchangers a and 31b are clamped together, the temperature of the heat exchangers 31a and 31b increases quickly. i Rapid heat exchange''; 531 a, 3 l
Since b has a small volume and a long water passageway 46,
This passageway 46 has good heat transfer with the water flowing upstream, and the partition wall plate 44 has a heat transfer and O effect, so the temperature of the flowing water increases.
In other words, it starts up quickly. Heat flow again! From the space heater 32 to the heat exchanger 31a, 31b, one face plate 43 to the partition wall plate 44. Since heat exchange is performed well as it advances to the other face plate 43, the temperature thereof decreases, and the temperature at the other face plate 43 located on the outside approaches the hot water temperature, so that the heat exchanger 31 a
, 31b, the heat radiation loss can also be reduced.

Next, when the main pulp 35 is closed and the water flow is stopped, the pressure switch 39 is turned off by the actuator 39a, and the power supply to the space heater 32 is stopped. In this case, an after-boiling dust phenomenon is sure to occur, but the heat capacity of the space heater 321f in one embodiment of the present invention is small,
x2 converter 31a.

Since the temperature difference between 31b and the raw water is achieved with a small temperature difference, the temperature increase due to post-boiling is slight.

In addition, when the pressure switch 39 malfunctions or the like causes dry firing, the partition wall plate 44 closes the heat exchanger 31a #31b'
f! :[Since the heat is soldered to the face plate 43 located outside the heat exchangers 531a and 31b, the heat is transferred to the face plate 4 located outside of the heat exchangers 531a and 31b
As a result, the temperature of the face plate 43 increases quickly, and as a result, the response of the thermostat 41 becomes faster and the temperature of the space heater 32 increases rapidly. Ix
'It can be stopped quickly. And also a heat exchanger 31b.

By brazing the bulkhead plate 44 to the face plate 431 that constitutes 31b, the illusion of water pressure will be greatly reduced.
For use in high water pressure areas: J7R: Can be used in areas with high water pressure.

Furthermore, the space heater 32;'1 heat exchanger 31a.

31b with a holding fitting (not shown),
Because it is one sentence, conventional 7-Z heater separation, 1"1
As with the above, brazing is no longer necessary for high-bottom workers, and there is no longer a need for special Q grinding to prevent insulation deterioration of the heater. be.

7L-1 is based on other embodiments of the present invention. Interval f treatment 44a? The effect of the fruit is the same as the fruiting example above.

FIG. 8 shows another embodiment of the present invention.
This embodiment has three heat exchangers 31a and 31b.

31c and their heat exchangers 31a.

Two space heaters 32° 32a between 31b and 31c
It is crimped and transmitted, and is used for large output products. The effect is almost the same as the above-mentioned actual flow example.

Effects of the Invention As described above, according to the present invention, a thin space heater with small heat tolerance is used, its quick heating properties are fully utilized, and the entire surface of the space heater is crimped and clamped between the face plate of the heat exchanger. The difference in nine degrees between the space heater and the heat exchanger can be reduced, and the Gai exchanger has a high -Pi overflow rate and a low water retention type, which improves heat transfer and cooling. Is there a public bath at 9 pm? It is faster to stand up, and there is less after-boiling, and it is cheap, 2
The throat is the heat sensitive part of the face plate lτ that forms the heat exchanger tsg? It has all the excellent features of the gods, such as no need for special arrangements in the manufacturing rod for pressure layering.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a conventional electric instantaneous water heater, Fig. 2 is an electric circuit diagram of the same water heater, and Fig. 3 is a main part configuration of another conventional electric instantaneous water heater. In the following, a is 9Il
1ITLI diagram, b is a front view, and FIG.
6 is a side view, b is a front view, and FIG. 6 is a cross-sectional view of a part of the heat exchanger in the same water heater. Figures 6 and 6 show the heater in the same water heater V, where aI'i is a sectional view, b is a front view, and Figures 7 and 8 are water heaters showing other embodiments of the present invention. It is a view of the 9!8th shrine of the vessel. 31 a, 31 b, 31 c---Heat exchanger, 32° 32a... Space heater, 4Q...
...Thermostat, 43... Face plate. Name of agent: Patent attorney Satoshi Nakao and 1 other person = z l
Figure 12 Figure fi3 Figure (α) (b) Figure 4 (CL) 51J (α) (
b) Figure 6 (α) (b)

Claims (1)

[Claims] It has a plurality of heat exchangers forming a 7L shape with a high passing flow rate and a small amount of retained water, a space heater, and a thermostand, and the latter several Q heat exchangers are each 2
The entire base of the space heater is crimped and sandwiched between the plurality of heat exchangers, and the heat exchanger is fixed between the plurality of heat exchangers. An electric instantaneous water heater constructed in such a way that a knife is pressed into contact with the surface of the body.