JP3633329B2 - Instant heating water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an instantaneous heating type hot water apparatus that heats water to a predetermined temperature in a short time.
[0002]
[Prior art]
Conventionally, this type of hot water apparatus is shown in FIG. 7 (for example, described in JP-A-10-220876).
[0003]
A hot water apparatus 101 shown in FIG. 7 includes a ceramic heater 102, a flange 103 integrally provided around the entire circumference of the ceramic heater 102, and a tank 104 that houses the ceramic heater 102. A box is formed by installing an O-ring 106 on a flange 105 provided on the base plate and fastening the flange 103 with a screw 107.
[0004]
The tank 104 has a water inlet 108 and a water outlet 109 communicating with the inside at the other end, a rib 110 is provided on the inner surface thereof, and a meandering water channel having the rib 110 as a partition between the ceramic heater 102. 111 is configured.
[0005]
With the above configuration, the water flowing into the tank 104 from the water inlet 108 is separated into both surfaces of the ceramic heater 102 at the portion A, passes through the meandering water channel 111, merges at the portion B, and then flows out from the water outlet 109.
[0006]
When electric power is supplied from the conducting wire 112 of the ceramic heater 102, heat generated from a heating element disposed inside the ceramic heater 102 is transmitted to the water flowing through the meandering water channel 111 through the surface of the ceramic heater 102, Is heated in a short time through the hot water apparatus 101 and flows out from the water outlet 109 continuously.
[0007]
The surface of the ceramic heater 102 forming the inner wall of the meandering water channel 111 is a heat transfer surface. By reducing the height of the ribs 110 provided on the inner surface of the tank 104 and the interval between them, the cross-sectional area of the meandering water channel 111 is reduced. The flow rate was increased, the heat transfer coefficient was increased, and the heat efficiency was improved.
[0008]
[Problems to be solved by the invention]
However, in the conventional instantaneous water heater 101 having the above-described configuration, although the heat transfer coefficient can be increased to some extent by increasing the flow velocity, the hot water flows along the surface of the ceramic heater 102, so there is a boundary layer on the surface of the ceramic heater 102. As a result of the development, heat generation on the surface of the ceramic heater 102 was not sufficiently transmitted to the hot water, and the increase in heat transfer coefficient was insufficient.
[0009]
In addition, heat was radiated from the flange 103 portion integrated with the ceramic heater 102 and the conductive wire 112 mounting portion exposed to the outside of the tank 104, and the efficiency of heat exchange with water was reduced.
[0010]
Since the flange 103 is required to fix the ceramic heater 102 to the tank 104, the heat exchanger cannot be reduced in size.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a small instantaneous heating type hot water apparatus having excellent thermal efficiency.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a flat plate heater having a plurality of through holes penetrating the front and back and an energizing terminal provided to energize the heating element is connected to the inner surface through a through hole. Inside the tank provided with a provided space, a plurality of protrusions for fixing the flat heater on the inner surface, an opening provided for taking out the current-carrying terminal to the outside of the tank, a water inlet and a water outlet It is stored as a partition wall, and water is communicated from the water inlet to the water outlet through a through hole.
[0012]
According to the above configuration, the water flowing into the tank from the water inlet flows while sequentially passing through the plurality of narrow spaces facing the flat heater, so that the flow rate can be increased and the heat transfer coefficient can be increased.
[0013]
Furthermore, heat exchange is performed while sequentially passing through a plurality of through holes provided in the flat heater, so that disturbance occurs near the surface of the flat heater, the boundary layer becomes thin, and the heat transfer coefficient is reduced by peeling. The heat exchange efficiency can be greatly improved, and the heat exchanger can be downsized.
[0014]
No flange is required to fix the flat heater to the tank, so there is no heat dissipation outside the tank, and almost all the heat from the heating element is transferred to the water, so the heat exchange efficiency is excellent and the heat exchanger Can be miniaturized.
[0015]
And since it flows through a through-hole, the temperature difference of the front and back of a flat heater can be made small, and it can heat uniformly.
[0016]
According to a second aspect of the present invention, there is provided a pair of ceramics comprising a plate-like heater made of alumina or the like in which a heating element that generates Joule heat by electric power is formed avoiding a through hole and the same through hole is provided on both sides thereof It is a ceramic heater formed by sandwiching between plates.
[0017]
Even if a plurality of through-holes are formed, the waterproofness and electrical insulation are not deteriorated, and it is possible to make the structure other than the energizing terminal portion submerged, thereby improving the heat exchange efficiency.
[0018]
The invention according to claim 3 is the ceramic heater characterized in that the radius of the through hole is smaller than the thickness of the ceramic plate forming the outline of the ceramic heater.
[0019]
With the same outer shape, it is possible to reduce the heat storage volume, increase the electrothermal surface area, and increase the heat and heat transfer rate.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
A plurality of through holes penetrating the front and back and a flat heater provided with an energizing terminal provided to energize the heating element; a plurality of space portions provided on the inner surface for communicating water through the through holes; and the inner surface Is housed as a partition wall inside a tank having a protrusion provided to fix the flat heater, an opening provided to take out the current-carrying terminal to the outside of the tank, and a water inlet and water outlet. Water is communicated to the water outlet through a through hole.
[0021]
According to the above configuration, the water flowing into the tank from the water inlet flows while sequentially passing through the plurality of narrow spaces facing the flat heater, so that the flow rate can be increased and the heat transfer coefficient can be increased.
[0022]
Furthermore, heat exchange is performed while sequentially passing through a plurality of through holes provided in the flat heater, so that disturbance occurs near the surface of the flat heater, the boundary layer becomes thin, and the heat transfer coefficient is reduced by peeling. The heat exchange efficiency can be greatly improved, and the heat exchanger can be downsized.
[0023]
No flange is required to fix the flat heater to the tank, so there is no heat dissipation outside the tank, and almost all the heat from the heating element is transferred to the water, so heat exchange efficiency is excellent and the heat exchanger Can be miniaturized.
[0024]
And since it flows through a through-hole, the temperature difference of the front and back of a flat heater can be made small, and it can heat uniformly.
[0025]
In addition, the flat heater is a ceramic in which a heating element that generates Joule heat by electric power is formed avoiding through holes, and both sides thereof are sandwiched by a pair of ceramic plates made of alumina or the like provided with similar through holes. A heater is provided.
[0026]
Even if a plurality of through-holes are formed, the waterproofness and electrical insulation are not deteriorated, and it is possible to make the structure other than the energizing terminal portion submerged, thereby improving the heat exchange efficiency.
[0027]
In addition, the ceramic heater is characterized in that the radius of the through hole is smaller than the thickness of the ceramic plate forming the outline of the ceramic heater.
[0028]
With the same outer shape, it is possible to reduce the heat storage volume, increase the electrothermal surface area, and increase the heat and heat transfer rate.
[0029]
【Example】
Hereinafter, the hot-water apparatus of the Example of this invention is demonstrated based on FIGS. FIG. 1 is a perspective view of a hot water device, FIG. 3 is a perspective view before assembly of the hot water device, FIG. 4 is a heating element formation diagram inside the ceramic heater, FIG. 5 is a front view of the ceramic heater, and FIG. is there.
The hot water device 1 constitutes a box by welding the tank 3 after housing the ceramic heater 2 in the tank 3.
[0030]
The tank 3 is provided with a water inlet 4 and a water outlet 5, and a plurality of spaces 6 and protrusions 15 are provided on the inner surface.
[0031]
In addition, an opening 8 is provided to take out the energizing terminal 7 to the outside of the tank 3, and an O-ring 9 is provided around the opening 8 so that the energizing terminal 7 can be reliably sealed with water.
[0032]
Inside the ceramic heater 2, a heating element 10 mainly composed of tungsten is formed so as to avoid the through hole 11, and a pair of ceramic plates 12 provided with the same through hole 11 on both sides of the heating element 10 wraps the heating element 10. It is constituted so as to be integrated.
[0033]
The energizing terminal 7 is brazed to the energizing portion 13 whose heat generation amount is reduced by widening the arrangement width, and is electrically connected to the heating element 10, thereby forming the ceramic heater 2.
[0034]
With the above configuration, the water flowing into the tank 3 from the water inlet 4 passes through the water flow path 14 through the through hole 11 of the ceramic heater 2 and flows out from the water outlet 5.
[0035]
When electric power is supplied from the energization terminal 7 of the ceramic heater 2, the heat generated by the heating element 10 is transmitted to the water flowing through the flowing water path 14 through the surface of the ceramic plate 12, and the water flows for a short time flowing through the hot water device 1. It flows out from the spout 5 continuously.
[0036]
Moreover, since there is no water storage part and the heat capacity of the water in the tank 3 can be reduced, the rate of temperature rise from the start of use until hot water having an appropriate temperature is discharged is fast, and the control responsiveness is also good.
[0037]
In addition, it is possible to submerge the portion other than the energizing terminal 7 portion of the ceramic heater 2, and the heat exchange efficiency can be further increased.
[0038]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
[0039]
A plurality of through holes penetrating the front and back and a flat heater provided with an energizing terminal provided to energize the heating element; a plurality of space portions provided on the inner surface for communicating water through the through holes; and the inner surface A projection provided for fixing the flat heater to the tank, an opening provided for taking out the current-carrying terminal to the outside of the tank, and a water inlet and a water outlet are housed as a partition wall in the tank. Since water is connected to the water outlet through a through hole,
[0040]
(1) Since the water flowing into the tank from the water inlet flows while sequentially passing through a plurality of narrow spaces facing the flat heater, the flow rate can be increased and the heat transfer rate can be increased.
[0041]
(2) Furthermore, since heat exchange is performed while sequentially passing through a plurality of through holes provided in the flat heater, disturbance occurs near the flat heater surface, the boundary layer becomes thin, and the heat is released by peeling. The transfer coefficient is improved, the heat exchange efficiency can be greatly improved, and the heat exchanger can be downsized.
[0042]
(3) Since a flange for fixing the flat heater to the tank is not required, there is no heat radiation outside the tank, and most of the heat from the heating element is transferred to the water, so heat exchange efficiency is excellent, and The heat exchanger can be downsized.
[0043]
(4) Since water flows through the through hole, the temperature difference between the front and back surfaces of the flat heater can be reduced, and heating can be performed uniformly.
[0044]
In addition, the flat heater is a ceramic in which a heating element that generates Joule heat by electric power is formed avoiding through holes, and both sides thereof are sandwiched by a pair of ceramic plates made of alumina or the like provided with similar through holes. Because it has a heater,
[0045]
Even if a plurality of through-holes are formed, the waterproofness and electrical insulation are not deteriorated, and it is possible to make the structure other than the energizing terminal portion submerged, thereby improving the heat exchange efficiency.
[0046]
Moreover, since the radius of the through-hole is smaller than the thickness of the ceramic plate forming the outer shell of the ceramic heater, the ceramic heater is provided.
[0047]
With the same outer shape, it is possible to reduce the heat storage volume, increase the electrothermal surface area, and increase the heat and heat transfer rate.
[Brief description of the drawings]
FIG. 1 is a perspective view of a hot water device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a flowing water path of the hot water device.
FIG. 3 is a perspective view before assembly of the hot water device.
FIG. 4 is a heating element formation diagram inside a ceramic heater of the hot water device.
FIG. 5 is a front view of a ceramic heater of the hot water device.
FIG. 6 is a side view of a ceramic heater of the hot water device.
FIG. 7 is a schematic configuration diagram of a conventional hot water apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hot water apparatus, 2 ... Flat heater (ceramic heater), 3 ... Tank 4 ... Water inlet, 5 ... Water outlet, 6 ... Space part, 7 ... Current supply terminal, 8 ... Opening part 9 ... O-ring, 10 ... Heat generation Body 11 through hole 12 ceramic plate 13 current-carrying portion 14 water flow path 15 projection

Claims (3)

A flat heater, a plurality of through holes penetrating the front and back provided in the flat heater, an energizing terminal provided to energize the heating element of the flat heater, and the flat heater as a partition are accommodated. A tank, a plurality of spaces provided in the tank inner surface for communicating water through the through holes, a protrusion provided for fixing the flat heater to the tank inner surface, and the outside of the tank An instantaneous heating type hot water apparatus provided with an opening provided to take out an energizing terminal and a water inlet and a water outlet provided in the tank. A flat heater is a ceramic heater in which a heating element that generates Joule heat by electric power is formed avoiding through holes, and both sides thereof are sandwiched by a pair of ceramic plates made of alumina or the like provided with similar through holes. The instantaneous heating type hot water apparatus according to claim 1. 2. The instantaneous heating type hot water apparatus according to claim 1, wherein the through hole has a radius smaller than the thickness of the outer ceramic plate.

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