JPH02225944A - Instantaneous hot-water heater - Google Patents

Abstract

PURPOSE:To assure desired temperature hot-water in a short time after hot-water supply is started by disposing an insulated hot-water storing container between a heat exchanger and a hot-water effluent part in the hot-water heater, disposing a circulation system passing through the insulated hot-water storing in the insulated hot-water storing container when the hot-water is not supplied. CONSTITUTION:The title heater comprises a hot-water heater body 1 and a water supply/hot- water supply unit 2. The water supply/hot-water supply unit 2 includes a water supply outlet connection port 4c and a hot-water supply inlet connection port 4h, each corresponding to a water supply inlet connection port 3c and a hot-water supply outlet connection port 3h, further including a water supply connection port 5c and a hot-water supply connection port 5h. The water supply connection port 5c and the water supply outlet connection port 4c are connected to each other through a water supply tube 6. The hot-water inlet connection port 4h and the hot-water effluent part connection port 5h are constructed with a hot-water supply tube 8 via a heat insulated hot-water storing container 7. The hot-water supply tube 8 and the water supply tube 6 located downstream the heat insulated hot-water storing container 7 are connected to each other via a pump 9 and a valve 10. Hot-water at a desired temperature or a temperature close to the desired temperature is available in a short time after hot-water supply is started. Further, hot-water raised in temperature to a predetermined temperature at a heat exchanger 15 is available after the passage of predetermined time.

Description

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

[Conventional technology]

For example, in a conventional instantaneous water heater as shown in Fig. 4, water is started by opening the faucet at the outlet A, and then the water flow is started by opening the faucet at the outlet A, and then using a water flow switch or a flow rate sensor C installed at an appropriate location in the water supply system. When the burner d detects flowing water above a predetermined level, the burner d starts combustion and heats the heat exchanger e, and the hot water thus heated in the heat exchanger e reaches the outlet a through the water flow system. The hot spring water comes from here. Note that symbols f and f' are temperature detection means such as a thermistor, g is a check valve, and h is a flow rate regulating valve.

[Invention tries to solve! l! Title]

In this way, in conventional instantaneous water heaters, after starting water flow and detecting water flowing above a predetermined level, burner d starts combustion and heating of heat exchanger e begins. The residual water in the water system that has not been heated at all is discharged, and then gradually heated hot water is discharged. Therefore, as shown by the broken line in FIG. 3, it takes a predetermined time period of 1.5 seconds from the start of water flow until hot water at the desired operating temperature is obtained. For example, it took a relatively long time, about 10 seconds.

This invention takes! The purpose is to solve iB.

[Means to solve the problem]

The configuration of the present invention will be explained with reference to FIGS. 1 to 3 corresponding to embodiments.
The water supply and hot water unit 2 includes a water supply outlet connection port 4c and a hot water supply inlet connection port 4h corresponding to the water supply inlet connection port 3c and the hot water supply outlet connection port 3h of the water heater body 1, respectively. At the same time, a water supply connection port 5c and a hot water outlet connection port 5h are provided, and the water supply connection port 5c and the water supply outlet connection port 4c are connected by a water supply pipe 6, and the hot water supply inlet connection port 4h and the hot water outlet connection port 5h are connected. A hot water supply pipe 8 is connected via a heat insulating hot water storage container 7, and a hot water pipe 8 on the downstream side of the heat insulating hot water storage container 7 and the water supply pipe 6 are connected via a pump 9 and a valve 10 through a return pipe 11.

[Function and Examples]

The instantaneous water heater of the present invention is constructed by connecting a water heater main body 1 and a water supply hot water outlet unit 2. For example, as shown in FIG. 1, this connection connects the water supply inlet connection port 3c and the hot water supply outlet connection port 3h of the water heater body 1 to the water supply outlet connection port 4c and the hot water supply inlet connection port 4h of the water supply and hot water outlet unit 2, respectively. Tubes 12c, 12h
Connect using. In addition, the cough water supply inlet connection port 3c, the hot water supply outlet connection port 3h, the water supply outlet connection port 4c, and the hot water supply inlet connection port 4h are configured as connection fittings (not shown) each configured at the tip of the piping, These may be configured to be directly connected. In addition to the above connections, the pipes 13c and 13h leading to the water supply and the hot water outlet are connected to the water supply connection port 5c and the hot water outlet connection port 5h of the water supply and hot water outlet unit 2, respectively, so that the unit can be used as an instantaneous water heater. Since the instantaneous water heater of the present invention is constructed by connecting the water heater main body 1 and the water supply hot water supply unit 2 as described above, the water heater main body 1 is an existing one, and the capacity is appropriately selected. can,
Instantaneous water heaters with a wide variety of functions can be easily constructed using a common water supply and hot water supply unit 2. Of course, it goes without saying that a newly constructed water heater body can be used.

In the above configuration, when the pump 9 is operated with the faucet of the hot water supply section closed and hot water not being dispensed, the water in the hot water storage container 7 will be discharged as indicated by the double-dashed line arrow in FIG. As shown, the water enters the return pipe 11 from the water supply pipe 8 via the branch point Ws, flows through the pump 9 and the valve lO, enters the water supply pipe 6 from the confluence position j and flows downstream, and flows from the water supply outlet connection port 4C to the water supply inlet. The water enters the water heater body 1 through the connection port 3C, flows through the water pipe 14, and then passes through the heat exchanger 15, and then flows from the hot water supply outlet connection port 3h to the hot water supply inlet connection port 4h into the water supply and hot water supply unit 2. The hot water enters the hot water supply pipe 8 and flows back into the hot water storage container 7. Since the water in the thermal hot water storage container 7 circulates through the heat exchanger of the water heater body 1 in this way, by combusting the burner 16 for heating the heat exchanger 15 as appropriate while operating the pump 9, The temperature of the circulating water can be raised, and thus hot water heated to a predetermined temperature can be stored in the hot water storage heat insulating container 7.

In this state, when the faucet of the hot water supply section is opened and hot water starts dispensing while the pump 9 is in the stopped state, the hot water is first discharged from the hot water supply section as shown by the solid line arrow in FIG. The residual water in the downstream pipe 8.13h is discharged, and then the hot water stored in the thermal hot water storage container 7 is discharged.

At the same time as this discharge, residual water in the piping on the upstream side flows into the hot water storage container 7 and mixes with the hot water inside.

On the other hand, when a running water switch (not shown) installed at an appropriate location in the water flow path detects running water due to the start of hot water dispensing, the burner 1
6 starts combustion and the temperature in the heat exchanger 15 starts to rise. Since the water supply pipe 6 has a valve 10, it does not flow into the return pipe 11 from the confluence position j.

In this way, hot water starts to be tapped, the burner 16 starts to burn, and then the temperature in the heat exchanger 15 starts to increase.
Until the hot water heated to a predetermined temperature is discharged from the hot water outlet, the residual water in the pipes is discharged, but as mentioned above, this residual water is mixed with the hot water stored in the thermal hot water storage container 7. Since the hot water is mixed, the hot water is not discharged as is, and therefore hot water close to the desired temperature can be continuously used, although the temperature of the hot water discharged from the hot water supply section is slightly lowered.

As described above, as shown in FIG. 3, the present invention allows hot water at a desired temperature or a temperature close to it to be used within a short time t after the start of hot water dispensing, and after a predetermined period of time has elapsed, heat exchange is performed. Hot water heated to a predetermined temperature in the vessel 15 can be used.

When hot water is supplied in this way, the heat exchanger 1
All of the hot water heated in step 5 is discharged via the heat-insulating hot water storage container 7, so if the set value of the hot water discharge temperature is changed using the hot water temperature setting device and the combustion amount of the burner 16 is adjusted, The hot water storage container 7 becomes a time delay element, and it tends to take a long time until hot water at a desired temperature is obtained from the hot water outlet. The configuration described below shortens this time.

That is, in this configuration, as shown in FIG. 2, the heat-retaining hot water storage container 7 is configured to have a variable volume, so that the volume increases against the return means by increasing the pressure of the internal hot water, and the pressure of the internal hot water increases. The structure is such that the volume is reduced by a return means when the pressure is lowered.

In such a configuration, when the faucet of the hot water outlet is closed and hot water is not being dispensed, the thermal hot water storage container 7 is heated by the water pressure of the water supply, and the temperature increases as shown by the two-dot chain line in Figure 2+a+ or in Figure 2. As shown by the solid line in (b), the volume increases against the return means, and thus a sufficient amount of hot water can be stored. In addition, when hot water is tapped, the pressure of hot water in the thermal hot water storage container 7 decreases to the back pressure.
As shown by the solid line in FIG. 2 or the two-dot chain line in FIG. As an example of a heat-retaining hot water storage container 7 that operates as shown in FIG. To explain the structure of FIG. 2 (bl) in more detail, the container body I7 has a mouthpiece 18 formed by insert molding or the like, and the mouthpiece 18 and the hot water supply pipe 8 are connected by a bag napht 19. Although the lower side of the container body 17 is omitted in the figure, a mouthpiece is also provided on the lower side, which constitutes an inlet and an outlet for hot water. Air vent 7L2
0, and this casing 21 limits the expansion of the container body 17.

In the above configuration, when water pressure from the water supply is applied when the hot water supply is stopped, the container body 17 is elastically deformed as shown by the solid line in Fig. increases. In addition, when the pressure is equal to the back pressure during hot water supply, it contracts due to its own elasticity and its volume decreases, as shown by the two-dot chain line in Figure 2 (bl).In this way, when using the rubber container body 17, In addition, the specific shape of the container body 17, the method of connecting it to the hot water pipe 8, etc., such as not storing the container body 17 in the casing 21 but using its own elasticity to balance water pressure and prevent unlimited expansion of the volume. The configuration of the hot water inflow section and outflow section is arbitrary.

In addition to being made of rubber, the elastically expandable container body 17 is made of
The variable volume heat-retaining hot water storage container 7 may be constructed using a bellows, or may be constructed from a cylinder and a piston, or may have a construction in which an elastic bag containing pressurizing gas is built into the container body, as appropriate. Also, the method of keeping warm is appropriate.

Next, a specific example of the control related to the above will be described. First, the control of the burner 16 during hot water supply can be performed as appropriate in the same manner as in the past. For example, in the water heater body 1, temperature sensors 22 and 23 such as thermistors, a flow rate sensor 24, a hot water temperature setting device (not shown), etc. provided on the upstream and downstream sides of the heat exchanger 15, etc. The supply of fuel to the burner 16 can be adjusted by feedforward control or feedback control to obtain hot water at a desired set temperature.

Next, the operation control of the pump 9 mentioned above and the combustion control of the burner 1G during operation of the pump 9 can be performed, for example, by the following method. The first method is to monitor the hot water temperature in the hot water storage container 7, and when the temperature at that point falls below a predetermined temperature, the pump 9 is operated, and the burner 1 is operated.
In this method, the temperature of the hot water in the hot water storage container 7 is raised to a predetermined temperature by controlling the combustion of the water. In this method, the temperature of the hot water in the hot water storage container 7 is monitored by installing a temperature sensor inside the hot water storage container 7 to directly monitor the hot water temperature, or by installing a temperature sensor between the hot water storage container 7 and the heat exchanger. It is also possible to indirectly monitor the temperature by a temperature sensor 23 provided between 15 and 15.

Next, the second method is to operate the pump 9 at predetermined time intervals, detect the temperature of the circulating water under such operating conditions, and control the combustion of the burner 16 when the temperature is below a predetermined temperature. In this method, the temperature of the circulating hot water and the temperature of the hot water in the thermal hot water storage container 7 are raised to a predetermined temperature. In this method, the temperature of the hot water is detected by a temperature sensor 22 installed at an appropriate location in the circulation path.
23 or the like.

Incidentally, as shown in FIG. 1, the water supply and hot water outlet unit 2 can also have a built-in check valve 25 corresponding to the connection with the water supply. In addition, the water heater body 1 is provided with a flow rate adjustment valve 26 for dispensing hot water at a reduced flow rate by giving priority to the set temperature when the hot water load exceeds the capacity of the burner 16. Additional configurations of the boiler main body 1 and the water supply/output unit 2 are appropriate.

〔Effect of the invention〕

As described above, the present invention configures a hot water storage container between a heat exchanger and a hot water tapping section of a water heater, and configures a circulation system that passes through the hot water storage container and the heat exchanger, so that hot water is not tapped. Since hot water is sometimes stored in a thermal hot water storage container, the hot water at or close to the desired temperature can be used within a short time after opening the hot water outlet and starting hot water supply.

The present invention raises the temperature of the hot water in the thermal hot water storage container by operating the circulation system and the burner, so hot water at a sufficient temperature can always be stored even at night in winter, and even when using electric heaters, etc. This has the advantage of not requiring an auxiliary heating source. In particular, the present invention provides that the hot water storage container, the recirculation piping, the pump, and the valve for configuring the circulation system are configured as a water supply hot water supply unit independently of the water heater main body, and the water supply hot water supply unit and the water heater Since the instantaneous water heater having the above-mentioned functions is constructed by connecting the water heater to the main body, it is possible to easily and inexpensively construct instantaneous water heaters with a wide variety of functions and capacities. It has the advantage that it can also be configured using .

In the instantaneous water heater of the present invention, both the water heater main body 1 and the hot water supply unit 2 are equipped with a control means and a power supply means (
(not shown), but it is easy to connect the latter control means as well as the former control means with a connector or the like, and to control them purposefully through communication between both control means.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of the overall configuration corresponding to an embodiment of the present invention;
Figure 2 (al, (bl) is a system diagram and cross-sectional view of the main structure corresponding to other embodiments, Figure 3 is an explanatory diagram showing the hot water output characteristics of the present invention and the conventional example, and Figure 4 is the conventional example. It is an explanatory diagram of an example system. Code 1: water heater main body, 2: water supply hot water unit,
3C...Water supply inlet connection port, 3h...Hot water supply outlet connection port, 4C...Water supply outlet connection port, 4h...Hot water supply inlet connection port, 5c...Water supply connection port, 5h...Hot water outlet Connection port, 6...Water supply pipe, 7...Heat hot water storage container, 8...Hot water supply pipe, 9...Pump, 10-...Valve, i i-...Recirculation pipe, 12c, 12h...・Connection pipe, 13C, 13h・
...Piping, 14...Water pipe, 15...Heat exchanger, 1
6... Burner, 17... Container body, 18... Mouth part, 19... Cap nut, 20... Air vent hole, 21
...Casing, 22.23'...Temperature sensor, 2
4...Flow rate sensor, 25...Check valve, 26...Flow rate adjustment valve. Figure if! Figure 2 (a)

Claims (6)

[Claims] (1) Consisting of a water heater body and a water supply hot water outlet unit, the water supply hot water unit includes a water supply inlet connection port of the water heater body,
Providing a water supply outlet connection port and a hot water supply inlet connection port corresponding to the hot water supply outlet connection port, respectively, providing a water supply connection port and a hot water outlet connection port, and connecting the water supply connection port and the water supply outlet connection port with a water supply pipe, The hot water supply inlet connection port and the hot water outlet connection port are connected by a hot water supply pipe via a heat insulating hot water storage container, and the hot water supply pipe on the downstream side of the heat insulating hot water storage container and the water supply pipe are connected via a pump and a valve by a return pipe. Features an instant water heater. (2) The thermal hot water storage container described in paragraph 1 has a variable volume, and when the pressure of the hot water inside increases, the volume increases against the return means, and when the pressure of the hot water inside decreases, the volume decreases by the return means. An instantaneous water heater characterized by having a configuration in which: (3) The burner of the pump and water heater body described in paragraph 1,
An instantaneous water heater characterized in that the water heater is controlled and operated by monitoring the temperature of hot water in a heat-insulating hot water storage container when hot water is not being dispensed from a hot water dispensing section. (4) The pump described in paragraph 1 is operated at predetermined intervals when hot water is not being discharged from the hot water supply section, and the burner of the water heater body is controlled in accordance with the water temperature in this operating state. An instantaneous water heater characterized by operating. (5) An instantaneous water heater characterized in that the valve described in item 1 is a check valve. (6) An instantaneous water heater characterized in that the water supply pipe according to item 1 is provided with a check valve upstream of the connection part with the reflux pipe.