JPH0136017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water boiler that stratifies high-temperature hot water from the top of a hot water storage tank. This relates to a hot water boiler structure in which water is ejected from the bottom.

Conventional configuration and its problems A conventional hot water boiler is configured as shown in FIG. That is, there is a hot water storage tank 3 having a hot water outlet pipe 1 in the upper part and a water supply pipe 2 in the lower part, and a circulation pump 4 and a heat source part 5 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 under conditions close to the outside temperature (0 to 5 degrees Celsius in winter), an instantaneous water heater is used as the heat source. Since this is used, low-temperature water is fed until it reaches a steady state (Figure 3 shows the start-up performance of a typical instantaneous water heater), and the water temperature in the hot water storage tank 3 reaches the temperature when it is boiled. On the other hand, there is a drawback that the hot water temperature 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, when considering freezing prevention during the coldest season, the heating circuit is more likely to freeze than the inside of the hot water storage tank. Therefore, protective measures can be taken such as installing large-capacity electric heaters at important points in the heat source and turning them on and off, or turning the heating circuit on and off, but in either case, , freezing can be prevented, but regarding the hot water temperature distribution in the hot water storage tank, if the heating circuit is one-way, low-temperature water will intermittently mix into the hot water storage tank and the hot water temperature will drop, as described above. At the same time, the temperature distribution becomes larger. 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 is necessary to minimize the distribution of hot water temperature at the time of boiling when the circulation flow rate is large, to prevent the temperature of the hot water from rapidly dropping and freezing, and to minimize the occurrence of uneven hot water discharge. The purpose is to

Structure of the Invention In order to achieve this object, the present invention provides a hot water boiler in which a heat source and a hot water storage tank are separated and forced convection is carried out using a circulation pump, which is equipped with a water supply pipe at the lower part,
A hot water storage tank having a mixing chamber from which a hot water outlet pipe is drawn out is provided at the upper part, and a first flow path having a circulation pump, a heat source, and a flow rate control valve is led out from the lower part of the hot water storage tank, and is concentrically connected to the mixing chamber at the upper part of the hot water storage tank. The first flow path is connected to a flow velocity attenuator, which is a hollow cylindrical shape with a bottom and has a large number of small holes in the horizontal direction around the circumference, and a second flow is connected from the downstream side of the heat source part of the first flow path. The path is branched and connected to the lower part of the hot water storage tank via the orifice,
The flow rate control valve is configured to close when the temperature of the flowing hot water is low and open when the temperature of the flowing hot water is high. As a result, it is possible to control the flow of high-temperature hot water into the upper part of the hot water storage tank from the first flow path and the flow of low-temperature hot water at the time of startup of the heat source into the lower part of the hot water storage tank through the second flow path; By attenuating the force of the circulation pump and setting the flow velocity so that no convection occurs in the hot water storage tank (for example, by replacing dynamic pressure with static pressure), and by uniformly distributing the water, The formation of temperature stratification in the upper part of high-temperature hot water with very little temperature distribution, a rapid temperature drop at the time of tap water, and uneven temperature distribution during the cold season.
Solvable.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in FIGS. 5 to 1.
The explanation will be based on Figure 0 drawing. In addition, in the figure,
The same parts as 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 side of the connecting pipe 8c is branched to the hot water supply pipe 8 via a flow rate control valve 15, and the other side is branched to a hot water supply pipe 17 via an orifice portion 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
Penetrate the tip of the mixing chamber 14 into the mixing chamber 14.
It is connected to a flow velocity 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.

Further, a hot water outlet pipe 1 is provided on one side wall of the mixing chamber 14, and a hot water supply pipe 17 is connected to a substantially lower portion of the hot water storage tank 3.

The temperature thermistor 9 is provided on the lower side wall of the hot water storage tank 3. Reference numerals 11a and 11b are flow rate adjustment units provided on the upstream side of the heating circuit, respectively.

Further, the flow rate control valve 15 is configured such that a disk-shaped movable plate 20 fixed to the temperature sensing part 18 filled with wax is positioned close to the orifice plate 22.
This disc-shaped movable plate 20 and the spring solid plate 21
A spring 19 is disposed between the thermosensing section 18 and the tip of a pin 23 extending and contracting from the upper end of the temperature sensing section 18 is brought into contact with a pin fixing plate 24.

Further, the orifice portion 16 has a disc-shaped structure (not shown) having a small hole.

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. After that, when the water temperature in the lower part of the hot water storage tank 3 rises to the set water temperature, the temperature thermistor 9 senses this and stops the circulation pumps 4a, 4b. Circulation pump 4
When the heat sources a and 4b stop, the heat sources 5a and 5b are extinguished by detection by the flow rate switch.

In this configuration, the flow rate of the circulation pumps 4a, 4b is kept constant, and the combustion amount of the heat sources 5a, 5b is determined by temperature thermistors (not shown) provided in the connecting pipes 8a, 8b, and the flow velocity damping body 12 detects the temperature. So that the temperature of the water sent to the area remains constant during steady state,
The amount of combustion is controlled proportionally.

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. is mixing chamber 1
Convection within the hot water storage tank 3 can be prevented by uniformly discharging the vertical jet in the hot water storage tank 4 from the entire area of the large number of small jet holes in the side wall, and by creating a jet condition close to static pressure. Upper stratification of high-temperature water without temperature distribution can be achieved. The performance at this time is the 9th
As shown in the figure.

(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, decreases due to the outside temperature, and when it reaches the water temperature, a faucet (not shown) is opened at the tip of the hot water pipe. When you open the bottle 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 begins.

At the beginning of this reheating, the low temperature water during the transient rise of the heat sources 5a and 5b is used for the flow rate control valve 15. The temperature sensing part 18 detects low temperature water and is in a contracted state (Fig. 7), and the spring 1
Due to the extension force of 9, the temperature sensing portion 18 is moved against the spring solid plate 21 via the disc-shaped movable plate 20.
It is pushed upward as shown in the figure, and the flow path between the orifice plate 22 and the disk-shaped movable plate 20 is closed. As a result, low-temperature water is transferred to hot water pipe 1
7 and is sent to the lower part of the hot water storage tank 3, which is the low temperature region.

Therefore, the temperature of the hot water in the hot water storage tank 3 is not lowered, and the hot water temperature distribution is not impaired. After that, when the temperature of the water from the heat source increases,
The temperature sensing portion 18 expands and operates in the opposite manner to the above, resulting in a state as shown in FIG.
Since the resistance is smaller than 6, a certain amount of high temperature hot water is sent from the hot water supply pipe 8 to the flow rate attenuator 12. At this time, as above, the flow velocity attenuator 1
2, the upper temperature stratification of high-temperature hot water is established because the hot water is dispersed and ejected at a flow velocity close to the static pressure.

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, there is no sudden temperature drop in the hot water storage tank 3, and it is possible to prevent freezing while maintaining the uniform temperature of the hot water. An example of the performance at this time is shown in FIG.

In addition, in the above embodiment, the hot water supply pipe and the hot water outlet pipe are arranged concentrically, but the present invention is not limited to this configuration, and the hot water supply pipe and the hot water outlet pipe may be separated and provided in the hot water storage tank. Needless to say. 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 installed in the upper part of the hot water storage tank, creating a jetting condition close to static pressure and reducing convection within the hot water storage tank. Since the upper stratification of high-temperature water can be prevented and the temperature distribution during boiling is extremely small, it is possible to obtain high-temperature water in a short time (it is possible to obtain high-temperature water quickly), which improves usability.

(2) By spouting high-temperature hot water from the heat source from the top of the tank and low-temperature water at rising temperature from the bottom of the tank, it protects against freezing during severe cold seasons, and also prevents the inside of the tank from freezing. It is possible to provide a hot water boiler in which the hot water temperature can be kept uniform, and the hot water temperature at the outlet is stable without any partial drop in the hot water temperature at the outlet.

(3) Since the system utilizes the temperature of the water from the heat source to switch up and down, the purpose can be achieved with an inexpensive configuration.

(4) Install a flow rate attenuator in the mixing chamber above the hot water tank,
And since the hot water pipe is taken out from the mixing chamber,
Even if there is water in the hot water storage tank, it can function as an instant hot water heater, making it economical as there is no need to store a large amount of hot water. You can get hot water without it.

(5) High thermal energy efficiency can be achieved, with a large quantity of hot water with stable water temperature (hot water storage function) and quick access to high temperature water (instantaneous function) using an upper stratification system for hot water.

Furthermore, since the heating circuits are arranged in parallel, even in the unlikely event of a failure, the system has the advantage of avoiding a complete stoppage during maintenance, and can be used for both home and commercial use.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional hot water boiler, Figure 2 is a boiling performance diagram of the same, Figure 3 is a typical start-up performance diagram of a general instantaneous water heater, and Figure 4 is a conventional example of hot water output. 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 same essential parts, and Fig. 7 shows the internal structure when the temperature sensing part of the flow control valve is contracted. FIG. 8 is a cross-sectional view showing the internal structure when the temperature sensitive part is expanded, FIG. 9 is a boiling performance diagram of an embodiment of the present invention, and FIG. 10 is a hot water temperature performance diagram of the same example. 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...Flow control valve, 16...Orifice part, 1
7...Hot water pipe.

Claims (1)

[Claims] 1. A hot water tank is provided with a water supply pipe at the bottom and a mixing chamber from which a hot water outlet pipe is drawn out at the top. A first flow path having a circulation pump, a heat source, and a flow rate control valve is drawn out from the bottom of the hot water tank. The first flow path is connected to a flow velocity attenuation body which is provided concentrically in the mixing chamber in the inner upper part and has a hollow cylindrical shape with a bottom and has a large number of small holes in the horizontal direction around the circumference. A hot water boiler in which a second flow path is branched from the downstream side of the heat source part and is connected to the lower part of the hot water storage tank via an orifice part, and the flow control valve is configured to close when the temperature of the flowing hot water is low and open when the temperature of the flowing hot water is high. .