JPH0115733Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a small electric water heater used in hot water washing equipment and the like.

Conventional configurations and their problems Conventional hot water washing devices include those built into the toilet seat and those built into the toilet bowl, and the small electric water heaters used in these systems have two types of functions: hot water storage type and instantaneous type. However, all of them are small and compact and have low wattage.

For example, the toilet seat built-in type shown in Fig. 1 sprays hot water from a cleaning nozzle 3 installed in a cleaning device main body 2 placed on a toilet bowl 1 to clean the parts of the human body to be cleaned. The water system is shown in Figure 2. That is, in this Figure 2,
Reference numeral 4 denotes a wash water pump, which sucks water from a low tank 5 through a filter 6 and supplies water to a hot water storage type water heater 8 via a solenoid valve 7. The hot water exiting the water heater 8 is then jetted out from the cleaning nozzle 3 via the vacuum break valve 9. 10 is a cleaning operation switch, and this cleaning operation switch 10 is used to start/stop the cleaning water pump 4 and the electromagnetic valve 7 and to adjust the flow rate.
FIG. 3 shows details of the hot water storage type electric water heater 8, in which 11 is a can body, 12 is a sheathed heater, and 13 is a temperature sensor, which is connected to a temperature regulator (not shown). 14 is a water inlet pipe, and 15 is a hot water outlet pipe. Such a hot water storage type electric water heater 8 generally has a hot water storage capacity of 0.4 to 2, a heater capacity of 500 to 900 W, a temperature adjustment range of 30 to 45°C, and a hot water output flow rate of 0.1 to 2.
It is about 2.5/min.

FIG. 4 is a diagram of an example of temperature-time characteristics,
This figure 4 shows hot water storage capacity 1, heater capacity 850W, adjustment temperature 45℃, water supply temperature 5℃, and hot water output flow rate 1/min.
Shows the temperature changes of boiling water and outlet water.
In other words, in this case, it takes about 3 minutes and 20 seconds to reach boiling point (point A) after power is supplied to the sheathed heater, and about 3 minutes and 30 seconds have elapsed since the start of dispensing (point A) (point O). The equilibrium temperature of the hot water is approximately 17.2°C. In addition, this type of water heater does not have the characteristics of complete stratification as a heat storage tank, so the temperature of the hot water starts to drop when the hot water volume reaches approximately half of the hot water storage capacity, and the response of the temperature control means is somewhat slow. Therefore, a drop in temperature (point E) occurs just before the equilibrium temperature is reached.
Therefore, in this case, the problem is that there is a large temperature change after the start of hot water dispensing, and it is necessary to shorten the washing time and use the jetted hot water intermittently to the extent that it does not cause discomfort.

Figure 5 shows an example of an instantaneous electric water heater, in which 16 is a hollow cylindrical ceramic heater;
7 is a heat generating layer terminal. 18 is a temperature sensing layer terminal, and this temperature sensing layer terminal 18 is connected to a temperature control circuit (not shown). Reference numeral 19 denotes a can that surrounds the heat generating portion of the ceramic heater 16. This can 19 is formed to have a small volume and has a tapping pipe 20. 21 is a water inlet formed at the end of the ceramic heater 16. The capacity of the heater 16 is 935W, and power is supplied in conjunction with water flow.

The characteristics of instantaneous electric water heaters are that the hot water temperature reaches equilibrium within a short time after hot water starts being tapped, and the temperature drop is small. Also, since the amount of hot water stored is small, heat loss during idle periods is also reduced. Also, the water supply temperature is 5℃, the flow rate is
At 0.35/min, a hot water temperature of approximately 40°C can be obtained, but if the flow rate is 1/min, the temperature drop will be large, dropping to 18.4°C, so the problem is that the flow rate cannot be increased.

Purpose of the invention This invention solves the above-mentioned drawbacks of the conventional technology.It combines two types of heat exchange functions, a hot water storage type and an instantaneous type, and instantaneously changes the hot water temperature to reduce changes in the hot water temperature over time. purpose.

Structure of the invention In order to achieve the above object, the small electric water heater of the invention consists of a cylindrical electric heater installed inside the can body with a ceramic heater having a self-temperature control function, and the electric heater is surrounded by a ceramic heater having a self-temperature control function. A high-temperature chamber is formed inside the inner cylinder, and a preheating chamber is formed in the corresponding part of the inner cylinder, and a hot water outlet pipe is connected to the end of the electric heater, and a water inlet pipe arranged in the can body is connected to the preheating chamber. The water system is configured in the following order: a chamber, a communication pipe arranged in the inner cylinder, a high temperature room, and a hot water outlet pipe. According to this structure, the cylindrical electric heater installed inside the can body has a self-temperature control function. Since the electric heater is constructed with a ceramic heater, the high temperature chamber formed inside the inner cylinder surrounding the electric heater has good temperature control responsiveness, and is formed outside the inner cylinder, that is, inside the can body. The preheating chamber is heated through the wall of the inner cylinder and waits until it reaches an intermediate temperature, so when hot water is tapped, the preheated water at the intermediate temperature flows into the high temperature chamber.
Therefore, until the inflow water temperature drops, the instantaneous flow rate can be increased more than the conventional instantaneous electric water heater, and the hot water temperature can be instantaneously varied, which is a practical effect.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. FIG. 6 shows an embodiment of the present invention. In FIG. 6, 31 is a can forming a preheating chamber 32, and a water inlet pipe 33 is disposed in this can 31. A communication pipe 36 is disposed in a cylindrical inner tube 35 that forms a chamber 34 therein. Further, a cylindrical electric heater 37 arranged concentrically within the inner cylinder 35 is composed of a ceramic heater having a self-temperature control function. water pipe 3
3 - preheating chamber 32 - communication pipe 36 - high temperature room 34 - hot water tap pipe 38 constitute a water system path in this order. Further, the ceramic heater 37 has a built-in heat generating film and a temperature sensing film, and the heater terminal 39 is connected to the power supply, and the sensor terminal 4 is connected to the power supply.
0 are each connected to an electronic temperature control device (not shown).

FIG. 7 shows another embodiment of the present invention.
In addition to the embodiment shown in FIG.
A waterproof space heater 41 is installed at the bottom of the
Then, this space heater 41 is connected to a temperature sensor 42.
It is also connected to an independent temperature control power source (not shown). In this case, the total capacity of the heaters is divided into two, and the capacities of the space heater 41 and the ceramic heater 37 are set. Alternatively, only one heater can be energized by the control device, and each heater can be set up to the total capacity.

Next, the operation of the above configuration will be explained. First, the hot water in the high temperature chamber 34 is maintained at a high temperature (selected at 30 to 45°C) by a ceramic heater 37 and an electronic temperature control device (not shown). As a result, due to heat exchange via the wall surface of the inner cylinder 35,
The temperature of the water in the preheating chamber 32 rises over time and reaches an intermediate temperature until it is on standby. Next, when you start the hot spring,
Electric power flows into the high temperature chamber 34 from the upper part of the preheating chamber 32 through the communication pipe 36, and is supplied to the ceramic heater 37 in response to the temperature drop within the high temperature chamber 34. The temperature flowing into the high temperature chamber 34 is an intermediate temperature, the responsiveness of temperature control is excellent, and the water system path in the high temperature chamber 34 passes from the outer periphery of the ceramic heater 37 through the inside to the hot water outlet pipe 38 at the end. Due to the combination of this structure and the presence of a heat exchange wall that responds to the rise in water temperature, changes in the outlet temperature over time are reduced. That is, until the temperature of the preheated water flowing into the high temperature chamber 34 decreases, the outlet temperature can be maintained within a sufficiently usable range even if the instantaneous flow rate is increased. However, since the temperature rise in the preheating chamber 32 is slow,
Sufficient downtime must be taken.

In another embodiment shown in FIG. 7, the high temperature inside the high temperature chamber 34 is adjusted to a high temperature by a ceramic heater 37, and the inside of the preheating chamber 32 is controlled to a high temperature by a space heater 41.
The temperature sensor 42 then maintains the temperature at an intermediate temperature and waits. When preheated water flows into the high temperature chamber 34 due to the start of hot water dispensing, power is supplied to the ceramic heater 37.
Moreover, the function of turning hot water into hot water and discharging it is the same as that of the embodiment shown in FIG. When water flows in from the water inlet pipe 33 due to hot water, the space heater 41
As a result, compared to the embodiment shown in FIG. 6, the temperature drop in the preheating chamber 32 can be delayed, and as a result, the usable time can be increased.

Effects of the invention As described above, according to the invention, the cylindrical electric heater installed inside the can body is composed of a ceramic heater having a self-temperature control function. The high-temperature chamber formed inside the can has good temperature control responsiveness, and the outside of the inner cylinder, that is, the preheating chamber formed inside the can, is heated through the wall of the inner cylinder and waits until it reaches an intermediate temperature. As a result, preheated water at an intermediate temperature flows into the high-temperature room when hot water is tapped, and the instantaneous flow rate can therefore be increased compared to conventional instantaneous electric water heaters until the temperature of this incoming water drops. Additionally, since it uses an electric heater with good responsiveness, it has the practical effect of instantly changing the water temperature to your preference.

[Brief explanation of the drawing]

Figure 1 is a side view showing the toilet seat built-in hot water washing device placed on the toilet bowl, Figure 2 is the water system diagram of Figure 1, and Figure 3 is a longitudinal section showing a conventional hot water storage type electric water heater. Figure 4 is a temperature-time curve diagram showing the operation of the water heater, Figure 5 is a longitudinal sectional view of a conventional instantaneous electric water heater, and Figure 6 is a small electric water heater showing an embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a small electric water heater showing another embodiment of the present invention. 31... Can body, 32... Preheating chamber, 33... Water inlet pipe, 34... High temperature chamber, 35... Inner cylinder, 36... Communication pipe, 37... Ceramic heater (electric heater),
38... Hot water pipe, 41... Space heater, 42
...Temperature sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A can body, a cylindrical electric heater installed inside the can body, an inner cylinder surrounding the electric heater, and a communication pipe arranged in the inner cylinder. and a water inlet pipe arranged in the can body, the electric heater is constructed of a ceramic heater having a self-temperature control function, and a high temperature chamber is formed inside the inner cylinder, and a high temperature chamber is formed outside the inner cylinder. A small electric water heater that forms a preheating chamber, further connects a hot water outlet pipe to an end of the electric heater, and configures a water system path in the order of the water inlet pipe, the preheating chamber, a communication pipe, a high temperature chamber, and the hot water outlet pipe. (2) The small electric water heater according to claim 1, wherein the preheating chamber of the can body is provided with an auxiliary heat source such as a space heater and temperature control means.