JPS6315510B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a hot water boiler that stratifies high temperature hot water from the upper part of a hot water storage tank, and is provided with a shape of the hot water storage tank and a flow rate attenuator at the spouting part of the high temperature hot water. This relates to the boiler structure.

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 under conditions close to the outside temperature (0 to 5 degrees Celsius in winter), the heat source may be 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.

Next, in a structure in which high-temperature hot water obtained at the heat source is stratified from the top of the hot water tank, in order to alleviate the sudden drop in hot water temperature caused by the mixing of low-temperature water when the heat source starts up. There is a conventional example as shown in FIG. That is, at the tip of the hot water supply pipe 8, a hollow cylindrical distribution tube 15 with a small hole 14 throughout the side wall and a bottomless distribution tube 15 is provided, and the height extends from the top to the bottom of the hot water storage tank 3. ing. This is due to forced convection by the circulation pump 4, so that all of the water in the hot water storage tank 3 is under dynamic pressure. Therefore, when the jetting flow velocity is high, the jetting fluid will be jetted from the lower part of the distribution cylinder 15 both during the transient period of rising and during the steady state. This can prevent a sudden drop due to the mixing of low-temperature water over almost the entire area of the hot water storage tank, but it also prevents high-temperature water from being stratified from above when the water in the hot water storage tank is boiled.

In addition, when the jetting flow velocity is small, the upper stratification of high-temperature hot water is established in the steady state, but the low-temperature water in the transient period of rise is in the process of being sent from the upper part to the lower part of the distribution tube 15 in the hot water storage tank 3. The temperature will increase due to heat exchange with the hot water, and the temperature distribution at the bottom of the hot water storage tank will change due to the fact that the hot water in the distribution tube 15 is sent to the bottom of the hot water storage tank, which may result in partial spouting on the way. Larger area where hot water temperature is stable (effective hot water storage capacity)
will decrease. However, it is somewhat better than the example shown in FIG. A performance example in this case is shown in FIG. Since this conventional example is a heating circuit, some adverse conditions can be tolerated.

Purpose of the Invention The present invention is intended to eliminate such conventional drawbacks, and is to minimize the hot water temperature distribution during boiling, especially when the circulating flow rate is large, and to
The purpose is to minimize the sudden drop in hot water temperature.

Composition of the Invention In order to achieve this object, the present invention is a hot water storage tank in which a heat source part and a hot water storage tank are separated, the upper center of which is projected and has a mixing chamber, and the heat source part is led out from the lower part of this hot water storage tank. A flow path is passed through the center of the upper part and connected to a flow rate attenuator below the mixing chamber.

With this configuration, when the hot water is boiled, the force of the circulation pump is attenuated by the flow velocity attenuator, so that the flow velocity becomes such that no convection occurs in the hot water storage tank (for example, by replacing dynamic pressure with static pressure). By setting the conditions and ejecting the vertical flow extremely uniformly in the horizontal direction using a velocity attenuator, temperature stratification of the high-temperature hot water is established, and the temperature distribution can be extremely reduced. Furthermore, even if there is a sudden drop in the temperature of hot water in some areas during taping, the flow velocity attenuator is configured so that the initial velocity is slow and the water is spouted in a dispersed manner. This prevents the water from dispersing over a wide area within the hot water storage tank, and drastically reduces the chance of a sudden drop in hot water temperature.

In order to ensure the above basic performance, the present invention has the upper end of the hot water storage tank protruding from the center in a circular shape, and the hot water outlet pipe in the mixing chamber is adjusted by adjusting the inclination of the installation position of the flow velocity damping body. By providing a mixing chamber, which serves as a so-called run-up section, to prevent drifting of the flow to the flow, basic performance can be more perfectly ensured.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be described in FIGS. 7 to 1.
The explanation will be based on Figure 0 drawing. 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 the lower part, and from the other lower part of the hot water storage tank 3, the water inlet pipe 6 is branched into 6a and 6b through a check valve 10, and circulation pumps 4a and 4b are connected to each other. , heat source parts 5a, 5b, hot water pipe 8
The branch pipes 8a, 8b and the hot water supply pipe 8 are arranged in this order to form a heating circuit.

The bottomed hollow cylindrical flow rate damping body 12 has a side wall made of porous material and has a large number of small ejection holes 13, and is connected to the hot water supply pipe 8, and is connected to the hot water supply pipe 8 at a substantially upper part of the hot water storage tank 3. High-temperature hot water is fed into the hot water storage tank 3 vertically from top to bottom, and the hot water is ejected horizontally to the hot water storage tank 3.

The temperature thermistor a9 is provided on the lower side wall of the hot water storage tank 3. Moreover, 11a and 11b are flow rate regulating valves, which are respectively provided on the upstream side of the heating circuit.

In the above basic configuration, the upper end of the hot water storage tank 3 has a mixing chamber 16 whose center protrudes concentrically, and which passes through the hot water supply pipe 8 concentrically,
The tapping pipe 1 is provided on the upper end side wall of the mixing chamber 16.

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 a9 senses and the circulation pump 4
A signal is sent to a and 4b to drive them. Circulation pump 4
When a and 4b are driven, the heat sources 5a and 5b are ignited by detection by flow rate switches (not shown) provided in the heat sources 5a and 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 a9 senses this and stops the circulation pumps 4a and 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 rate of the circulation pumps 4a, 4b is kept constant, and the combustion amount of the heat source parts 5a, 5b is determined by temperature thermistor b (not shown) provided in the connecting pipes 8a, 8b, and the flow velocity attenuator. The amount of combustion is controlled proportionally so that the temperature of the hot water sent to the section 12 remains constant.

In this boiling process, the flow rate attenuator 12
The high-temperature hot water from the hot water supply pipe 8 is 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 there will be no temperature distribution. Upper stratification of high-temperature water can be achieved. 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, 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.

After that, the temperature thermistor a9 provided on the side wall of the hot water storage tank 3 senses the temperature, and the circulation pumps 4a, 4b are activated.
Sends a signal to drive. Circulation pump 4a, 4b
When the heat source parts 5a and 5b are driven, the heat source parts 5a and 5b begin to ignite based on the detection by the flow rate switches provided in the heat source parts 5a and 5b, and reheating is started.

At the beginning of this reheating, low-temperature water during the transient rise of the heat sources 5a and 5b is sent from the hot water pipe 8.

In this process, the flow velocity attenuator 12 is provided at the top of the hot water storage tank 3, and the hollow cylindrical shape with a bottom and a large number of small ejection holes are provided in the vertical vertical side walls, so that the pressure is close to static pressure. Because the flow rate is high and the spout is dispersed rather than concentrated, the transient low-temperature water from the hot water supply pipe 8 can be prevented from spreading over a wide range within the hot water storage tank 3, and the temperature of the hot water that comes out can be prevented from dropping rapidly. It can be reduced to a minimum. The performance at this time is the first
Shown in Figure 0.

Regarding the above basic operation and performance, if the flow velocity attenuator is tilted or eccentric for some reason, or if one side wall is clogged, the flow will be more biased than the flow velocity attenuation body. Hot water will be pumped in. In this case, the ninth
The performance shown in Figures 1 and 10 will deteriorate somewhat. Therefore, even under this type of condition, the ninth
In order to substantially maintain the performance shown in Figures 1 and 10, a mixing chamber is provided at the upper end of the hot water storage tank.

As a result, even if a biased flow occurs from the flow rate damping body, the drifted flow is not directly sent to the hot water tap pipe, but is mixed and sent to the hot water tap in the mixing chamber, which is larger than the volume of the flow rate damper. It will be alleviated.

Effects of the Invention As described above, 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 below the mixing chamber and connected to a flow path from a heating source that penetrates through the upper center of the hot water storage tank. By creating a jetting condition close to static pressure, convection within the hot water storage tank can be prevented and high temperature hot water can be stratified at the top with very little temperature distribution during boiling, allowing hot water to be obtained in a short time ( This makes it possible to quickly obtain high-temperature water, which improves usability.

(2) By using the same flow velocity attenuator as above and providing a large number of small ejection holes on the vertical vertical side walls, distributed ejection can be achieved, resulting in ejection that is close to uniform static pressure.
It is possible to prevent diffusion of low-temperature water in the hot water storage tank when the heat source is turned on, and to stabilize the temperature of hot water when hot water is tapped.

(3) High-temperature hot water obtained from a heat source is sent through the mixing chamber provided at the top of the hot water storage tank from the center of the top. Therefore, even if the position of the flow velocity damping body oscillates or is slightly distorted, and the ejection conditions from the flow velocity damping body become biased for some reason, the flow will still flow in the mixing chamber. Since the hot water is sent to the outlet pipe while being mixed, the above (1) and (2)
The objective can be achieved without significantly compromising the performance of the system.

(4) Rather than linearly controlling the circulation pump from startup to steady state or installing a flow control valve in the hot water supply pipe to ensure performance during boiling and discharging, a simple configuration is required. This achieves the purpose and can be realized at an extremely low cost.

(4) 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 a benefit during maintenance.According to this hot water boiler, it can be It will be possible to respond to up to

(5) It is possible to provide a hot water boiler with high thermal energy efficiency, which has a large amount of hot water with a stable temperature (hot water storage function) and a high temperature hot water upper stratification system that quickly draws 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 general start-up performance diagram of an instantaneous water heater, and Figure 4 is a hot water temperature diagram of the same as above. Performance chart, FIG. 5 is a configuration diagram of another conventional example, FIG. 6 is a hot water temperature performance diagram of another conventional example, FIG. 7 is a configuration diagram of a hot water boiler according to an embodiment of the present invention, and FIG. 8 is an enlarged sectional view of the same main part, Figure 9 is a boiling performance diagram of the same,
FIG. 10 is a performance diagram of the hot water temperature. 3...Hot water tank, 4a, 4b...Circulation pump, 5
a, 5b...Heat source section, 8...Hot water pipe, 12...Flow rate attenuator, 13...Ejection small hole, 16...Mixing chamber.

Claims (1)

[Claims] 1. A hot water storage tank having a mixing chamber with a protruding upper center and a hot water pipe drawn out from the upper part of the mixing chamber,
A hot water boiler in which a flow path having a circulation pump and a heat source is drawn out from the lower part of the hot water storage tank, and this flow path is passed through the center of the upper part of the hot water storage tank and connected to a flow rate attenuator below the mixing chamber. 2. The hot water boiler according to claim 1, wherein the diameter of the mixing chamber is larger than the diameter of the flow rate attenuator.