JPH09135776A - Hot-water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source with which required time from the start of electrification to the start of heat generation can be remarkably shortened. SOLUTION: A hot-water heater 1 is provided with a water passing pipe 4, to which a feed water pipe 2 and a hot water pickup pipe 3 are connected, and a heat source arranged in the water passing pipe 4. This heat source is composed of a filament 6 for generating heat by electrification and a lamp heater 5 provided with a crystal quartz pipe 7, in which required gas is sealed after surrounding the filament 6. Then, this hot-water heater 1 is provided with a solenoid valve 13 for feeding water arranged at the inlet of the feed water pipe 2, a hot water supply temperature sensor 14 arranged at the outlet of the hot water pickup pipe 3, and control circuit 15 for controlling the opening/closing operation of this solenoid valve 13 for feeding water based on the temperature detected by the hot water supply temperature sensor 14.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water heater,
Specifically, it relates to the heat source.

[0002]

2. Description of the Related Art Although not shown in the drawings, among water heaters used for constructing a hot water supply device, a hot water supply pot, etc., there are water supply pipes and sampling pipes as disclosed in JP-A-7-127913. The hot water pipe is provided with a water pipe connected to each other at different positions and an electric heater arranged as a heat source in the water pipe, and the cold water flowing in the water pipe is heated by the electric heater. There is a structured one.

[0003]

By the way, in the electric heater provided in the conventional water heater, it takes time from the start of energization to the start of heat generation, and it does not reach a sufficient heat generation state immediately upon energization. Therefore, it takes some time for the cold water supplied through the water supply pipe to be heated by the electric heater to become hot water of the required temperature and to be discharged from the hot water pipe. It was In order to obtain hot water immediately when needed, it is necessary to provide a large-capacity hot water storage tank and store hot water that has been heated to the required temperature. Not only was the decrease in hot water temperature due to heat dissipation inevitable, but it was also necessary to provide a hot water storage tank.

The present invention was devised in view of these inconveniences, and provides a water heater equipped with a heat source capable of significantly shortening the time required from the start of energization to the start of heat generation. It is intended to be provided.

[0005]

A water heater according to a first aspect of the present invention comprises a water pipe to which a water supply pipe and a hot water pipe are connected, and a heat source arranged in the water pipe. The heat source is a lamp heater including a filament that generates heat with energization and a quartz tube that surrounds the filament and is filled with a required gas. A coating layer for radiating an electromagnetic wave having a peak value of 3 μm to 6 μm is formed on the outer surface of the quartz tube constituting the lamp heater of the water heater according to claim 2, while the coating layer is formed. A coating layer for preventing contact between the quartz tube and water is formed on the outer surface of the quartz tube constituting the lamp heater of the water heater.

Further, the water pipe of the water heater according to claim 4 has a polygonal cross section, and the inner surface has a high reflectance surface, while the water passage of the water heater according to claim 5 The water pipe has a circular cross section, and its inner surface is an electromagnetic wave absorbing surface. further,
A water heater according to a sixth aspect of the present invention is based on a solenoid valve for water supply arranged at an inlet of a water supply pipe, a hot water supply temperature sensor arranged at an outlet of a hot water supply pipe, and a temperature detected by the hot water supply temperature sensor. And a control circuit for controlling the opening / closing operation of the water supply solenoid valve.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a water heater according to the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view showing a simplified basic structure of a water heater according to the present embodiment, FIG. 2 is an explanatory view showing a schematic control structure thereof, and FIG. 3 is an enlarged view of a modification of a water pipe. 4 is a vertical sectional view showing the structure of a hot water supply pot in which a water heater is incorporated, and FIG. 5 is a vertical sectional view showing a modification thereof. Reference numeral 1 in these drawings is a water heater.

The water heater 1 according to the present embodiment is used when constructing a hot water supply device, a hot water supply pot, etc., and as shown in FIG. 1, the water supply pipe 2 and the hot water supply pipe 3 are at different positions. That is, the water pipe 4 connected to the lower position and the upper position along the longitudinal direction so as to communicate with each other, and a lamp heater that is disposed along the longitudinal direction in the water pipe 4 and functions as a heat source, For example, a lamp heater 5 such as a halogen heater or a xenon heater is provided. The lamp heater 5 is configured to include a filament 6 that generates heat when energized, and a quartz tube 7 that surrounds the filament 6 and that is filled with a required gas such as a halogen gas or a xenon gas. Is something
The charging portion provided at the end portion of the lamp heater 5 is sealed with the mold resin 8.

Further, at this time, the upper and lower end portions of the water pipe 4 are respectively bolts 1 screwed together through O-rings 9.
It is sealed with 0 and the nut 11 so as to prevent water leakage. That is, the lamp heater 5 here is a high-temperature heat source having a small heat capacity and immediate heating, that is, a heat source that reaches a temperature of about 2400 K within 0.3 seconds from the start of energization by a power source (not shown). As is known, a steady-state electromagnetic wave is immediately generated by the lamp heater 5 when the power switch is turned on. The cold water is heated in an extremely short time as the electromagnetic waves emitted from the lamp heater 5 are repeatedly reflected in the water pipe 4, and as a result, the water heater 1 heats the cold water immediately when necessary. It is possible to obtain hot water after it has been heated, and there is no need to store heated water at all.

Therefore, in the hot water supply apparatus having the structure in which the water heater 1 is incorporated, as shown in FIG. 2, the water supply solenoid valve 13 is arranged at the inlet of the water supply pipe 2 provided in the water supply pipe 4, and the water supply is performed. The water supply pipe 2 is connected to a general water pipe (not shown) via the solenoid valve 13 for use, while the hot water supply temperature sensor 14 is provided at the outlet of the hot water pipe 3. Based on the temperature detected by the hot water supply temperature sensor 14, the opening / closing operation of the water supply solenoid valve 13 is controlled by the control circuit 15 for power supply control. That is, when the condition that the hot water supply temperature is 98 ° C. is set for the control circuit 15 provided in the hot water supply device having such a configuration, until the hot water supply temperature sensor 14 detects 98 ° C. After heating the water in the water pipe 4 by the lamp heater 5 with the water supply solenoid valve 13 closed, the water supply solenoid valve 1 is detected when the hot water supply temperature sensor 14 detects 98 ° C.
After opening 3, the hot water is discharged from the hot water collecting pipe 3 connected to the water passage pipe 4.

By the way, in the water heater 1 according to the present embodiment, the electromagnetic wave generated by the lamp heater 5 is supposed to be radiated as it is into the water pipe 4, but the electromagnetic wave from the lamp heater 5 is incident. A coating layer (not shown) that emits an electromagnetic wave having a peak value of 3 μm to 6 μm may be applied to the outer surface of the quartz tube 7 and then formed. When forming such a coating layer, a ceramic material having high heat resistance, which is known by the trade name of Okitsumo, is used, and when this coating layer is formed, it is 3 μm or more. As a result of the high energy absorption rate of water for electromagnetic waves of 6 μm, the heating efficiency for cold water is improved.

In the lamp heater 5, the quartz tube 7 is used because the quartz tube 7 has a high electromagnetic wave transmittance. However, in the quartz tube 7 that is constantly in contact with water, the quartz tube 7 is used. The transparency will decrease due to the effects of sodium and potassium contained in water. Therefore, in order to prevent such an inconvenience from occurring, a coating layer (not shown) made of a resin material such as Teflon (trade name) or a ceramic material is applied on the outer surface of the quartz tube 7. It is preferable to adopt a configuration in which the contact between the quartz tube 7 and water is prevented by forming the quartz tube.

Further, the water pipe 4 in which the lamp heater 5 is arranged generally has a circular cross section. For example, as shown in FIG. It is conceivable that the cross section has a polygonal shape and the inner surface of the water pipe 4 has a high reflectance surface of electromagnetic waves, for example, a metal surface. Then, with such a configuration, the electromagnetic wave radiated from the lamp heater 5 (indicated by symbol A in FIG. 3) may be reflected by the inner surface of the water pipe 4 and then return to the lamp heater 5 again. It becomes difficult, and water pipe 4
Electromagnetic waves that have been repeatedly reflected inside are easily absorbed by water, resulting in improved heating efficiency for cold water.

Furthermore, when the water pipe 4 has a circular cross section, it is conceivable to set the inner surface of the water pipe 4 as an electromagnetic wave absorbing surface. That is, if the inner surface of the water pipe 4 is used as an electromagnetic wave absorbing surface by adopting a blackening treatment or the like, the electromagnetic wave radiated from the lamp heater 5 is efficiently absorbed and it is difficult to return to the lamp heater 5. Therefore, the total length of the lamp heater 5 can be shortened, and the efficiency of heating water can be improved. As a specific blackening treatment method, a method of plating the inner surface of the water pipe 4 made of stainless steel with nickel, copper plating, and then black chrome plating, or a method of water pipe 4 There is a method of applying a ceramic material such as Okitsumo on the inner surface. Further, as the blackening treatment when the material of the water pipe 4 is aluminum, blackening alumite treatment with black nickel or the like can be considered.

By using the water heater 1 according to the present embodiment, a hot water supply pot as shown in FIGS. 4 and 5 is constructed. That is, the hot water supply pot shown in FIG. 4 supplies the cold water stored in the water tank 17 to the water pipe 4 of the water heater 1 by the water supply pump 18, and the cold water supplied to the water pipe 4 is supplied to the lamp. By heating with the heater 5, the hot water has a required hot water supply temperature and is then discharged to the outside. With this configuration, it is possible to immediately obtain hot water when necessary by simply storing cold water instead of hot water, and there is an advantage that heat loss to the outside does not occur.

The hot water supply pot shown in FIG. 5 includes a water storage tank 20 capable of storing not only cold water but also hot water, and a hot water storage temperature sensor 21 for detecting the temperature of the hot water stored in the water storage tank 20. , A circulation pump 2 interposed in a circulation pipe 22 provided by branching from the hot water pipe 3 connected to the water pipe 4.
3 is provided. In this hot water supply pot, the hot water obtained by heating the cold water to the required temperature in the water heater 1 is circulated by the circulation pump 23 in the water storage tank 2
When the decrease in the hot water temperature is detected by the hot water storage temperature sensor 21, the hot water supply pump 18 supplies the hot water to the water heater 1 and then heats the hot water again to repeat the heating process. It is possible to maintain it. Therefore, according to this hot water supply pot, by controlling the detection temperature of the hot water storage temperature sensor 21 via a control circuit (not shown), it is possible to provide hot water in a cold state or by reheating. The advantage is that boiling water can also be provided. Reference numeral 24 in FIG. 5 indicates a hot water collecting solenoid valve, and 25 indicates a steam vent valve.

[0018]

As described above, according to the water heater according to the present invention, since the lamp heater that immediately generates electromagnetic waves upon the start of energization is used as the power source, the time required until the start of heat generation is significantly increased. As a result, it is possible to provide cold water immediately as hot water. Therefore, it is not necessary to provide a hot water storage tank for storing hot water as in the conventional example, and the effect of reducing heat loss can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a simplified basic structure of a water heater according to an embodiment.

FIG. 2 is an explanatory view schematically showing the control structure.

FIG. 3 is a cross-sectional view showing a modified example of the water pipe.

FIG. 4 is a vertical sectional view showing a structure of a hot water supply pot in which a water heater is incorporated.

FIG. 5 is a vertical sectional view showing a modification thereof.

[Explanation of symbols]

 1 Water Heater 2 Water Supply Pipe 3 Hot Water Pipe 4 Water Flow Pipe 5 Lamp Heater (Heat Source) 6 Filament 7 Quartz Pipe 13 Water Supply Solenoid Valve 14 Hot Water Temperature Sensor 15 Control Circuit

Claims (6)

[Claims] 1. A water heater comprising a water pipe to which a water supply pipe and a hot water pipe are connected, and a heat source arranged in the water pipe, wherein the heat source is a filament that generates heat when energized. And a quartz tube in which a required gas is enclosed after surrounding the filament, a water heater comprising: 2. The coating layer for radiating an electromagnetic wave having a peak value of 3 μm to 6 μm is formed by being deposited on the outer surface of the quartz tube constituting the lamp heater. Water heater. 3. The coating layer for preventing contact between the quartz tube and water is formed on the outer surface of the quartz tube constituting the lamp heater by coating. Water heater. 4. The water pipe has a polygonal cross section, and the inner surface has a high-reflectance surface, according to any one of claims 1 to 3. Water heater. 5. The water pipe has a circular cross section,
The water heater according to any one of claims 1 to 3, wherein the inner surface is an electromagnetic wave absorbing surface. 6. A water supply solenoid valve disposed at the inlet of the water supply pipe, a hot water supply temperature sensor disposed at the outlet of the hot water supply pipe, and the water supply solenoid valve based on the temperature detected by the hot water supply temperature sensor. 6. A water heater according to any one of claims 1 to 5, further comprising a control circuit for controlling the opening / closing operation of the water heater.