JPS6235581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water boiler that spouts high-temperature hot water from the upper part of a hot water storage tank and stratifies the temperature. This paper relates to the structure of a hot water boiler made by

Conventional configuration and its problems A conventional hot water boiler is configured as shown in FIG. That is, a hot water storage tank 3 has a hot water outlet pipe 1 at the top and a water supply pipe 2 at the bottom, and from the bottom of the hot water storage tank 3, a circulation pump 4 and a heat source section 5 are sequentially connected to a connecting pipe 6,
7 and 8, and the connecting pipe 8 is connected to the substantially upper part of the hot water storage tank 3 to form a heating circuit.

In this structure, the high temperature hot water obtained in the heat source section 5 is
Since hot water is stored from almost the top of the hot water tank 3, when boiling the water in the hot water tank 3 to a high temperature, the conditions for spouting from the connecting pipe 8 to the hot water tank 3 must be carefully adjusted. There is a drawback that the temperature distribution in the upper and lower parts of the chamber becomes uneven. For example, when the flow rate of the circulating flow rate is high, the diffusion within the hot water storage tank 3 becomes more intense and becomes more non-uniform. This is particularly noticeable when the circulation flow rate is large. The performance in this case is shown in FIG.

Furthermore, when dispensing hot water after a while after boiling, if the heat source section 5 is operated in a state F close to the outside temperature (0 to 5 degrees Celsius in winter), the heat source is an instantaneous water heater. Since this is used, low-temperature water is fed to a steady state (Figure 3 shows the start-up performance of a typical instantaneous water heater).
There is a drawback that the temperature of the water in the hot water storage tank 3 decreases compared to the temperature when it is boiled, and the temperature of the hot water that comes out of the tank 3 drops suddenly in some areas. An example of this performance is shown in FIG.

Furthermore, since the heat source and the hot water storage tank are separated, the heating circuit is more likely to freeze than the inside of the hot water storage tank when considering freezing prevention during the extremely cold season. Therefore, we installed large-capacity electric heaters at important points in the heat source section, and
Possible means of protection include turning the heating circuit off or turning the heating circuit on and off, but either method can prevent freezing, but the heating circuit If there is only one route, low-temperature water will intermittently mix into the hot water storage tank, and the temperature of the hot water will drop and the temperature distribution will widen, as described above. If hot water is dispensed under this condition, there is a drawback that hot water with uneven temperature will be dispensed.

These are problems specific to the method of temperature stratifying hot water from the top.

OBJECT OF THE INVENTION The present invention obviates these drawbacks and
In particular, it minimizes the distribution of hot water temperature at the time of boiling when the circulation flow rate is large, prevents sudden drops in the temperature of the hot water and freezes, and minimizes uneven hot water discharge. In addition, the purpose is to not have a negative effect on the stable temperature range (effective hot water storage amount).

Structure of the Invention In order to achieve this object, the present invention provides a flow path having a circulation pump, a heat source, and a first electric two-way valve from the bottom of a hot water storage tank having a water supply pipe at the bottom and a hot water outlet pipe at the top. The flow path is connected to the upper flow rate damping body in the hot water storage tank, and the connection between the heat source part and the first electric two-way valve is connected to the lower part of the hot water storage tank via the second electric two-way valve. The first and second
The configuration includes a timer for switching the electric two-way valves, and when the first and second electric two-way valves are switched by the timer, most of the hot water sent to the upper part of the hot water storage tank is high-temperature hot water.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 5 to 8.
The explanation will be based on the drawings. In the figures, parts that are the same as those in FIG. 1, which is a conventional example, are given the same numbers.

In the figure, the hot water storage tank 3 is equipped with a water supply pipe 2 at its lower part, and from the other lower part, an inlet pipe 6 is branched into connecting pipes 6a and 6b through a check valve 10, and circulation pumps 4a and 4b, respectively. Connecting pipes 7a, 7b, heat source section 5
a, 5b, connecting pipes 8a, 8b are arranged in this order, and converge in a connecting pipe 8c.

One of the connecting pipes 8c is branched into the hot water supply pipe 8 via a first electric two-way valve 15, and the other is branched into a hot water supply pipe 17 via a second electric two-way valve 16.

The hot water storage tank 3 has a mixing chamber 14 whose upper end is concentrically protruding from the center, and the hot water supply pipe 8
The tip thereof passes through the mixing chamber 14 and connects to a flow rate attenuator 12 made of a porous material and having a large number of small holes 13 in the side wall of a hollow cylinder with a bottom, which is provided approximately at the upper part of the hot water storage tank 3. It is connected.

Further, a hot water outlet pipe 1 is provided from the upper end of one side wall of the mixing chamber 14, and a hot water supply pipe 17 is connected to the hot water storage tank 3 at a position lower than the water inlet pipe 6.

In addition, a hollow cylindrical flow velocity attenuator 12 with a bottom
has a large number of small ejection holes 13 on the side wall,
It is made of porous material, and high-temperature hot water from the hot water supply pipe 8 is sent vertically from top to bottom into the hot water tank 3 at a substantially upper part of the hot water storage tank, and the spouting direction is horizontal to the hot water storage tank 3. It is arranged so that

The temperature thermistor 9 is provided on the lower side wall of the hot water storage tank 3 and is provided above the water inlet pipe 6. 11a,1
Reference numeral 1b indicates a flow rate adjustment pot, which is provided on the upstream side of the heating circuit.

Furthermore, the electric two-way valves 15 and 16 are interlocked in a circuit (not shown), and when the electric two-way valve 16 is operated on a timer and closed, the electric two-way valve 15 is opened. .

Next, in the above configuration, the operation will be explained separately during boiling and dispensing.

(1) When boiling When the water temperature in the hot water storage tank 3 is lower than the set water temperature,
The temperature thermistor 9 senses and the circulation pump 4a,
A signal is sent to 4b to drive it. circulation pump 4a,
4b is driven, the heat sources 5a, 5b are ignited by detection by flow rate switches (not shown) provided in the heat sources 5a, 5b, and the water is circulated and heated. At this time, in the initial stage when the heat sources 5a and 5b start up, the electric two-way valve 16 is open while the electric two-way valve 15 is closed, and hot water is sent from the hot water pipe 17 to the lowest part of the storage tank 3. After the timer operates, the electric two-way valve 16
closes, the electric two-way valve 15 opens, and the hot water tank 3
Hot water will be pumped into the top of the tank. After that, when the water temperature in the lower part of the hot water storage tank 3 rises to the set hot water temperature, the temperature thermistor 9 senses this and stops the circulation pumps 4a, 4b. When the circulation pumps 4a, 4b are stopped, the heat sources 5a, 5b are extinguished by detection by the flow rate switch. In this configuration, the flow rates of the circulation pumps 4a and 4b are constant,
The combustion amount of the heat source parts 5a, 5b is determined by the connecting pipes 8a, 8b.
A temperature thermistor (not shown) provided therein detects the temperature and proportionally controls the amount of combustion so that the temperature of the hot water sent to the flow rate attenuator 12 remains constant during steady state.

In this boiling process, the flow rate attenuator 12
is set concentrically with the mixing chamber 14, and the side wall of the hollow cylinder with a bottom is made of porous material to increase the ejection area. By uniformly ejecting vertical jets horizontally from the entire area of the many small jet holes in the side wall, and by creating jet conditions close to static pressure, convection within the hot water storage tank 3 can be prevented and the temperature distribution can be improved. It is possible to achieve upper stratification of high-temperature hot water. The performance at this time is shown in FIG.

(2) When hot water is dispensed: The hot water in the hot water storage tank 3 is at a predetermined temperature (e.g. 80℃)
After a while, the hot water in the heating circuit, including the hot water in the heat source, drops due to the outside temperature, and when it reaches the water temperature, a faucet (not shown) at the tip of the hot water pipe is opened. When you open the tap and tap the hot water,
Low-temperature water is sent through the water supply pipe, and high-temperature water at a predetermined temperature is sent out from the upper hot water pipe in a push-up method.

Thereafter, the temperature thermistor 9 provided on the side wall of the hot water storage tank 3 senses the temperature and sends a signal to the circulation pumps 4a, 4b to drive them. When the circulation pumps 4a, 4b are driven, the heat sources 5a, 5b are detected by flow rate switches (not shown) provided in the heat sources 5a, 5b.
5b starts to ignite and reheating starts.

At the beginning of this reheating, the process is similar to the above-mentioned boiling, but in detail, the electric two-way valve 15 closes and the electric two-way valve 16 opens. Therefore, the hot water is sent from the hot water supply pipe 17 to the lower part of the hot water storage tank 3 from the water inlet pipe 6. Thereafter, the electric two-way valve 15 opens and the electric two-way valve 16 closes according to a signal from a timer that is set according to the rise characteristics of the heat source used as a heating circuit.

Therefore, only high-temperature hot water is sent to the hot-water storage tank 3 during reheating, and upper temperature stratification of the high-temperature water is established without lowering the hot water.

Furthermore, to prevent freezing during extremely cold seasons, the heating circuit including the heat source is operated on and off (not shown); Hot water pipe 8
The rising low-temperature water flows through the flow rate attenuator 12 through
Since the low-temperature hot water is fed from the lower part of the hot water storage tank 3, it is possible to prevent freezing while maintaining uniformity of the temperature of the hot water in the hot water storage tank 3. An example of the performance at this time is shown in FIG.

Furthermore, since the low-temperature water at the time of startup of the heat source section is sent to the lower part of the water inlet pipe 6 below the temperature thermistor 9 provided in the hot water storage tank 3, there is no adverse effect on the water temperature near the temperature thermistor 9. The object of the present invention can be achieved during reheating and antifreeze operation while ensuring a stable range of hot water temperature.

In the above embodiment, the hot water supply pipe and the hot water supply pipe are arranged concentrically, but the present invention is not limited to this configuration, and it goes without saying that the hot water supply pipe and the hot water outlet pipe may be separated from each other and provided in the hot water storage tank. stomach. Further, the above-mentioned protruding mixing chamber may be provided as necessary, and may also serve as the upper part of the hot water storage tank.

Effects of the Invention According to the hot water boiler of the present invention, the following effects can be obtained.

(1) During boiling, in a steady state, a constant temperature of hot water is sent to the flow rate attenuator, and the flow rate attenuator is placed approximately at the top of the hot water storage tank, and by using a porous material on the side wall of a hollow cylinder with a bottom. The jetting conditions are close to static pressure, preventing convection within the hot water storage tank, and creating an upper stratification of high-temperature water with very little temperature distribution at the time of boiling, so high-temperature water can be obtained in a short time (high-temperature water can be obtained quickly). ), which improves usability.

(2) By ejecting high-temperature hot water from the heat source from the top of the tank and low-temperature hot water at the rising temperature from the bottom of the tank, it protects against freezing during extremely cold periods.
In addition, it is possible to maintain uniformity of the temperature of hot water in the hot water storage tank, and to provide a hot water boiler with a stable outlet hot water temperature without any partial drop in the outlet hot water temperature.

(3) By sending low-temperature water from the heat source to the bottom of the hot water storage tank, the purpose can be achieved without adversely affecting the effective amount of hot water stored.

(4) Switching between high-temperature water and low-temperature water from the heat source is controlled by first and second electric two-way valves, which requires fewer mechanical drives.

(5) Since the heating circuits are connected in parallel, even in the unlikely event of a failure, complete stoppage of the function can be avoided, which is an advantage during maintenance.According to this hot water boiler, it can be It can be used up to the point of use.

(6) It is possible to provide a hot water boiler with high thermal energy efficiency, which has a large quantity of hot water with stable water temperature (hot water storage function) and a high-temperature hot water upper stratification system to quickly draw hot water (instantaneous function).

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional hot water boiler, Figure 2 is a boiling performance diagram of the same as above, Figure 3 is a typical start-up performance diagram for an instantaneous water heater, and Figure 4 is a conventional hot water boiler. Thermal performance diagram; FIG. 5 is a configuration diagram of a hot water boiler according to an embodiment of the present invention; FIG. 6 is an enlarged sectional view of the main parts;
FIG. 7 is a boiling performance diagram of one embodiment of the present invention, and FIG. 8 is a hot water temperature performance diagram of the same. 3...Hot water tank, 4a, 4b...Circulation pump, 5
a, 5b...Heat source part, 8...Hot water pipe, 12...Flow velocity damping body, 13...Ejection small hole, 14...Mixing chamber,
15...First electric two-way valve, 16...Second electric two-way valve, 17...Hot water pipe.

Claims (1)

[Scope of Claims] 1. A flow path having a circulation pump, a heat source, and a first electric two-way valve is pulled out from the bottom of a hot water storage tank having a water supply pipe at the bottom and a hot water outlet pipe at the top, and this flow path is used for hot water storage. Connected to the upper flow rate attenuator in the tank, and connected to the heat source and the first
The electric two-way valve is connected to the lower part of the hot water storage tank via a second electric two-way valve, and according to the rise characteristics of the heat source part,
A hot water boiler comprising a timer for switching the first and second electric two-way valves. 2. The hot water boiler according to claim 1, wherein the flow rate attenuator is concentric with the mixing chamber and disposed so that the direction of ejection of the hot water is horizontal to the hot water storage tank.