JPH02251048A - Instantaneous hot water heater - Google Patents

Abstract

PURPOSE:To generate a large quantity of hot water at a suitable temperature by connecting a steam generator to a heat exchanger to form a heat medium circuit, connecting a water source and a hot water storage tank to the exchanger, heating water from the water source with steam from the generator, and storing it in the tank. CONSTITUTION:A heat accumulator 1 is held at a set temperature by an external power source 37, and hot water of a predetermined temperature is stored in a hot water storage tank 6. When a manual valve 31 is opened in such a state, mixed hot water of water from a water source 4 and hot water from the tank 6 is outputted from a hot water pipe 30, but since it is controlled to be fed back, mixed hot water of temperature set by an output hot water temperature setter 39 is fed ont. Since the tank 6 is connected to the source 4, the water of the source 4 is automatically fed through a heat exchanger 5 to the tank 6 to hold the quantity of storage hot water constant. On the other hand, since steam of heat medium generated by a steam generator 2 is fed to the exchanger 5 of a heat medium circuit 12, the water passing it is heated to a high temperature with the steam of the heat medium.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to an instantaneous water heater.

(b) Conventional technology Traditionally, instantaneous water heaters have either a hot water tap method, one that heats water from a water source and dispenses hot water, or one that stores pre-heated hot water and dispenses it as needed. There is a hot water storage type.

Furthermore, there are heat sources that use gas and those that use electricity.

Various types of instantaneous water heaters are manufactured using combinations of the above-mentioned hot water tapping method and heat source.

(C) Problems to be Solved by the Invention However, in the case of a device that uses gas as a heat source and a device that uses electricity as a heat source, the temperature of the hot water rises slowly. It has the disadvantage that it takes a long time to produce hot water at an appropriate temperature, and to overcome this disadvantage, it is necessary to increase the capacity of the heat source, which is uneconomical.

In addition, with hot water storage type, the hot water temperature rises quickly, but the temperature of the hot water storage is 100 degrees Celsius or less, and the amount of hot water stored is limited by the capacity of the hot water storage tank, so the amount of thermal energy stored is limited. Increasing the hot water temperature or the amount of hot water used requires a large-capacity hot water storage tank, which requires a large installation space and increases equipment costs.

(d) Means for Solving the Problems In the present invention, a heating device and a steam generating device are arranged in a heat storage device made of a ceramic material, and the steam generating device is connected to a heat exchanger to form a heat medium circuit, To provide an instantaneous water heater configured to connect a water source and a hot water storage tank to the same heat exchanger so that water from the water source is heated by steam from a steam generator and stored in the hot water storage tank. It is something.

(E) Function In the present invention, since the heat storage device made of ceramic material can withstand high temperatures, the heat storage device is heated to
If heated to ~1200°C, a large amount of thermal energy can be stored.

When a heat medium is fed to a steam generator installed in such a high-temperature heat storage device, high-temperature steam is instantaneously generated.

The steam thus generated can release a large amount of thermal energy when it condenses,
By heating water from a water source with such steam via a heat exchanger, a large amount of hot water at an appropriate temperature can be generated.

(f) Effects As mentioned above, a large amount of thermal energy can be stored in a heat storage device, and high-temperature hot water can be stored in a hot water storage tank. The following effects are achieved by using a heat medium that undergoes phase transformation to transfer heat to water.

■ The temperature of the hot water rises faster.

■ A large amount of hot water can be dispensed at high temperatures.

■ The device can be made smaller, requiring less space for installation, and equipment costs can be reduced.

(G) Embodiments The embodiments of the present invention will be described in detail based on the drawings.
The figure shows a schematic configuration of an instantaneous water heater (A), which consists of a heat storage device (1), a steam generator (2) installed in the heat storage device (1), and a heating device. a heat exchanger (5) communicating with the device (3), the steam generator (2) and the water source (4);
It consists of a hot water storage tank (6) connected to the downstream side of the heat exchanger (5), and piping connecting these.

As shown in FIGS. 2 and 3, the heat storage device (1) is constructed by integrating approximately brick-shaped ceramic blocks (7). ), and a heating wire (9) as a heating device (3) is disposed inside the cavity (8).

In addition, a steam generator (2) made of stainless steel thin tubes (11) is inserted into the substantial portion (10) of the heat storage device (1), and the steam generator (2) is connected to the heat exchanger (5). ) to form a heat medium circuit (12), and the heat medium circuit (12)
A circulation pump (13) and server park 14) are installed in 2), and the heat medium sealed in the heat medium circuit (12) is transferred from the reservoir (14) to the circulation pump (13) - steam generator (2) -
He is trying to circulate in the order of heat exchanger (5)-reservoir 14).

Note that (1) is a heat-insulating shrine that can withstand high temperatures and is made of asbestos, rock wool, foamed ceramic, or the like and coats the heat storage device (1).

As shown in Fig. 4, the heat exchanger (5) is a vertically long one-shaped heat exchanger plate (15) made of a thin metal plate with four shallow recesses in the center.
), two such heat transfer plates (15) are stacked face-to-face, and the outer periphery is sealed by welding.
) are provided with a heat medium vapor inlet and a condensed heat medium outlet (19) at the upper and lower portions of the heat transfer body (16), respectively.

As shown in FIG.
are arranged vertically with the condensed heat medium flow pipe 19) facing upward, and the steam inflow pipe (20) connected to the heat medium vapor inlet (18).
The condensed heat medium outlet pipe (2) is connected to the condensed heat medium outlet (19).
1) are connected in communication with each other, and the casing (1)
7) has an inlet (22) and an outlet (22) for water from the water source (4).
23), as shown in the schematic diagram of FIG.
Steam flows inside the heat transfer body (16) from top to bottom, and heated water flows horizontally and laterally along the surface of the heat transfer body (16).

Furthermore, as shown in FIG. 4, the surface of the heat exchanger plate (15) is formed with a large number of short vertical protrusions (24), and the upper ends of these protrusions (24) are approximately mountain-shaped. The protrusions (z4) are arranged so that the condensed heat medium droplets generated on the inner surface of the heat exchanger plate (15) quickly flow down, increasing the chance of direct contact of steam with the inner surface of the heat transfer plate (15). This increases the heat exchange efficiency between the steam and the heated water.

In addition, a hot water storage tank (6) is connected to the downstream side of the heat exchanger (5), and the water heated by the heat exchanger (5) is temporarily stored in the hot water storage tank (6). ) is connected to an electric hot water mixing valve (26) via an on-off valve (25).

A cold water pipe (29) branched from the water source (4) is connected to the electric hot water mixing valve (26), and the hot water mixed by the electric hot water mixing valve (2B) is transferred to the hot water pipe (30), It can be made to flow out of the vessel via the manual on-off valve (31).

In addition, as shown in FIG. 1, the input section of the control device (3B) includes a temperature sensor (84) provided in the heat storage device (1) and a water temperature sensor (35) provided in the middle of the hot water pipe (80). and a hot water temperature setting device (39) are connected.

Further, a relay (88) interposed between the heating device (3) and the external power source (37) is provided in the input section of the control device (86),
The electric hot water mixing valve (2θ) and the circulation pump (18)
is connected to.

Then, based on the detected value of the temperature sensor (34), a preset temperature is set as a target, and the heat storage device (
1), and based on the detected value of the water temperature sensor (35), operates the electric hot water mixing valve (2B) to mix the water from the water source (4) with the hot water from the hot water storage tank (6). Food pack control of the hot water temperature is performed by adjusting the mixing ratio and targeting the temperature set by the hot water temperature setting device (39).

The embodiment of the present invention is constructed as described above, and the heat storage device (1) is maintained at the above-mentioned set temperature by an external power source (37), and the hot water storage tank (6) stores hot water at a predetermined temperature. are doing.

In this state, when the manual on-off valve (31) is opened, a mixture of hot water, which is a mixture of water from the water source (4) and hot water from the hot water storage tank (6), flows out from the hot water pipe (30). Since the feedback control is as follows, the hot water temperature setting device (
The mixed hot water at the water temperature set in step 39) will flow out of the container.

The hot water in the hot water tank (6) flows out due to the above action, but since the hot water tank (6) is connected to the water source (4),
Water from the water source (4) automatically flows into the hot water storage tank (6) via the heat exchanger (5) to keep the amount of hot water stored constant.

On the other hand, since the heat medium steam generated by the steam generator (2) is supplied to the heat exchanger (5), the heat exchanger (5)
) will be heated to a high temperature by the steam of the heating medium.

In the heat medium circuit (12) connected to the heat exchanger (5), the liquid heat medium in the reservoir (14) is pumped through the circulation pump (1).
3) is sent to the steam generator (2), and since the steam generator (2) is heated to a high temperature setting by the heating device (3), the heat sent into the steam generator (2) is The medium instantly turns into high-temperature superheated steam and passes through the heat exchanger (5).
sent to.

Then, it exchanges heat with water from the water source (4) in the heat exchanger (5), condenses to become a liquid heat medium, and returns to the reservoir (14) again.

The amount of heat exchanged above is extremely large because the heat energy of the superheated steam temperature, the latent heat when the heat medium vapor condenses, and the heat energy of the difference between the condensed heat medium temperature and the set temperature are added. Even with a small amount of heat medium steam, it is possible to sufficiently and rapidly superheat the temperature of the hot water injected into the hot water storage tank (6).

In addition, the heat storage device (1) is a ceramic block (7) (7)
Because it is composed of
1) can store a large amount of thermal energy, and the hot water storage tank (6) also stores high-temperature hot water, so it is possible to dispense a large amount of high-temperature hot water with small equipment.

In addition, as shown in Fig. 1, a heat exchanger (5) and an on-off valve (
Bypass piping (40) and valve (
41), when the hot water temperature needs to be particularly high, the valve (41) is opened and the hot water heated by the heat exchanger (5) is directly discharged without passing through the hot water storage tank (6). You can also do it.

Furthermore, in the present invention, heat exchange between the water from the water source (4) and the heat medium is performed via the heat exchanger (5).
The heat medium circuit (12) and water from the water source (4) are completely isolated.

Therefore, any heat medium can be used,
In addition, the internal pressure of the heat medium circuit (12) can be set arbitrarily, and the heat transfer capacity from the steam generator (2) to the heat exchanger (5) and the heated target in the heat exchanger (5) can be adjusted. The final temperature of the water, that is, the temperature of the hot water stored in the hot water tank (6) can be increased.

As mentioned above, by storing a large amount of thermal energy and increasing the heat transfer ability from the heat storage device (1), it is possible to use small equipment even when washing hair using a shower that consumes a large amount of hot water. Sufficient hot water can be discharged regardless of the situation, and the amount of hot water discharged will not be insufficient.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of the instantaneous water heater according to the present invention, Fig. 2 is a cross-sectional explanatory diagram showing the - configuration of the heat storage device, and Fig.
The figure is a cross-sectional view taken along line I-I in Figure 2, Figure 4 is a plan view of the heat exchanger plate, Figure 5 is a cross-sectional explanatory diagram showing the structure of the heat exchanger, and Figure 6 shows the action of the heat exchanger. Schematic % Formula %: : ): : Figure Figure Figure

Claims (1)

[Claims] 1) Ceramic heat storage device (1) and heating device (3)
and a steam generator (2).
) is connected to a heat exchanger (5) to form a heat medium circuit (12), and a water source (4) and a hot water storage tank (6) are connected to the heat exchanger (5) to form a steam generator ( An instantaneous water heater configured to heat water from a water source (4) using steam from 2) and store it in a hot water storage tank (6).