JPS5941739A - Hot-water boiler - Google Patents

Abstract

PURPOSE:To prevent a deviated flow of the water to a drawing pipe of hot water resulting from an inclination of a mounting position of a flow speed attenuator from occurring, by making the top of a hot water tank, whose central part is made to protrude concentrically, into a mixing chamber. CONSTITUTION:The lower part of a hot water tank 3 is provided with a water supply pipe 2 and a heating circuit is formed by diverging a water taking-in pipe 6 into pipes 6a and 6b from the other lower part of the hot water tank 3 through a check valve 10 and providing circulating pumps 4a and 4b, heat source parts 5a and 5b, branch pipes 8a and 8b of a hot water supply pipe 8 and the hot water supply pipe 8 on each of the pipes 6a and 6b in this order respectively. A side wall of a bottomed, hollow and cylindrical attenuator 12 is made into a porous material having a large number of spouting holes 13, through which a convection within the hot water tank 3 can be prevented and forming of a layer of hot water of a high temperature at the upper part can be realized. In addition to the above, as a titled boiler possesses a mixing chamber 16 which is obtained by making the central part of the top of the hot water tank 3 protrude concentrically, the hot water supply pipe 8 is penetrated through concentrically and a hot water drawing pipe 1 is provided on a side wall of the top of the mixing chamber 16, even if a drift is generated on a jet flow from a flow speed attenuator due to unforeseen reason drawing of hot water whose temperature is equalized is obtainable as the jet flow is sent into the hot water drawing pipe while it is mixed in the mixing chamber.

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 problems thereof 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. It has a structure in which the heat source parts 5 are successively connected by connecting pipes 6 and 7°8, and the connecting pipe 8 is connected to the upper surface of the hot water storage tank 3 to form a heating circuit.

In this structure, the high temperature hot water obtained from the heat source section 6 is transferred to the hot water storage tank 3.
Since hot water is stored from the road side 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 between the top and bottom 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, suppose that the heat source part 6 is
When operating under conditions close to 5℃), since an instantaneous water heater is used as a heat source, low-temperature water will be pumped to a steady state (Figure 3 shows a typical instantaneous water heater). There is a drawback that the temperature of the hot water in the hot water storage tank 3 (indicating start-up performance) decreases compared to the temperature when it is boiled, and the temperature of the hot water that comes out suddenly drops 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. In other words, at the tip of the hot water supply pipe 8, a small hole 1 is formed in a hollow cylindrical shape and extends over the entire side wall.
4, a bottomless distribution cylinder 15 is provided, and the height is from the top to the bottom of the hot water storage tank 3. This is due to forced convection by the circulation pump 4, and all the water in the hot water storage tank 3 becomes dynamic pressure. Therefore, when the jet flow velocity is large,
It will be ejected from the lower part of the distribution cylinder 15 both during the transient period of start-up and during the steady state. This prevents the hot water storage tank from rapidly dropping down due to the mixing of low temperature water throughout the tank, but it also prevents high temperature water from being stratified from the top when the water in the tank is boiled.

In addition, when the jetting flow velocity is small, the upper stratification of high-temperature hot water is established in a steady state, but the low-temperature water in the transient period of rise is sent from the upper part of the distribution tube 15 to the lower part, and is
The temperature will rise due to heat exchange with the hot water inside the tank, and the temperature will rise partially due to spouting, or the high temperature hot water inside the distribution tube 15 will be sent to the bottom of the hot water storage tank, so the temperature at the bottom of the hot water storage tank will increase. Area where the distribution is wide and the hot water temperature is stable (effective hot water storage amount)
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 these conventional drawbacks, and is to minimize the distribution of hot water temperature during boiling, especially when the circulation flow rate is large, and to prevent a sudden drop in the temperature of the hot water when dispensing hot water. The purpose is to minimize the

Structure of the Invention In order to achieve this object, the present invention employs a system in which the heat source part and the hot water storage tank are separated, and the hot water storage tank has a mixing chamber with the upper center protruding, and a flow rate attenuator is provided in the mixing chamber of the hot water storage tank. A heating circuit is formed.

With this configuration, during boiling, the flow velocity damping body
Attenuating the force of the circulation pump and setting conditions to achieve a flow velocity that does not cause convection within the hot water storage tank (for example, replacing dynamic pressure with static pressure), and reducing the vertical flow horizontally using a flow velocity attenuator. By ejecting the hot water extremely uniformly in the direction, temperature stratification of the hot water is established and the temperature distribution can be minimized. Furthermore, even if there is a sudden drop in water temperature in some areas during taping, the flow rate attenuator is configured to have a slow initial velocity and a dispersed spout, which can reduce the low temperature when the heat source starts up. This prevents 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 protruded from the center in a circumferential manner, and the installation of the flow rate attenuator in the mixing chamber is determined by the inclination of the hot water outlet pipe. 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 fully ensured.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 7 to 10. In addition, in the figure, the first
Parts that are the same as those in the figure 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 a water inlet pipe 6 is connected from the other lower part of the hot water storage tank 3 through a check valve 10.
Branches into ea and 6b, and circulation pumps 4a and 4b, respectively.
, the heat source parts 5a and 6b, the branch pipes sa and sb of the hot water supply pipe 8, and the hot water supply pipe 8 are arranged in this order to form a heating circuit.

The bottomed hollow cylindrical flow velocity damping body 12 has a side wall made of porous material and has a large number of small ejection holes 13.
The high-temperature hot water from the hot water supply pipe 8 is fed vertically from above to the bottom of the hot water tank 3 on the road inside the hot water tank 3, and the spouting direction is horizontal to the hot water tank 3. It is arranged so that

Temperature thermistor a9ids is provided on the lower side wall of the hot water storage tank 3. Further, 111a and 11b are flow rate regulating valves, which are respectively provided on the upstream side of the heating circuit.

In the basic configuration as described above, the upper end of the hot water storage tank 3 has a mixing chamber 16 whose center protrudes concentrically, and the hot water supply pipe 8 is penetrated concentrically, and the hot water outlet pipe 1 is connected to the mixing chamber 16. It is installed on the upper side wall of the.

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

(1) At the time of boiling When the water temperature in the hot water storage tank 3 is lower than the set water temperature, the temperature thermistor a9 senses it and the circulation pump 4a is activated.

A signal is sent to 4b to drive it. Circulation pump 4a.

When 4b is 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 4&, 4b are stopped, the heat sources sa, sb are extinguished by detection by the flow rate switch.

In this configuration, the flow rates of the circulation pumps 4&, 4b are constant,
The amount of combustion in the heat sources 5a, 6b is determined by temperature thermistors b (not shown) provided in the connecting pipes sa and sb, and the temperature is determined so that the temperature of the hot water sent to the flow rate attenuator 12 remains constant. The amount of combustion is controlled proportionally.

In the boiling process, the flow rate attenuator 12 is set on the road of the hot water storage tank, and the side wall of the hollow cylinder with a bottom is made of porous material to increase the ejection area. The high-temperature hot water from the hot water supply pipe 8 is spouted vertically and horizontally uniformly from the entire area of the large number of small spout holes in the side wall, and the spout conditions are close to static pressure.
It is possible to prevent convection within the hot water storage tank 3 and realize upper stratification of high temperature hot water without temperature distribution. The performance at this time is shown in FIG.

(2) When dispensing hot water After the hot water in the hot water storage tank 3 has been boiled to a predetermined temperature i (e.g. 80°C), after a while, the hot water in the heating circuit, including the hot water in the heat source, reaches the outside temperature. When the faucet (not shown) at the tip of the hot water tap is opened and the hot water reaches the water temperature, low-temperature water is pumped through the water supply pipe and is pushed up from the hot water tap at the top to the specified level. Hot water is sent out.

After that, the temperature thermistor a installed on the side wall of the hot water tank 3 is
9 senses and sends a signal to the circulation pumps 4a, 4b to drive them. When the circulation pumps 4a and 4b are driven, the heat source section 5a,
The heat source part sa, by the detection of the flow rate switch provided in 5b,
5b starts to ignite and reheating starts.

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

In this process, the static pressure is reduced by providing the flow rate attenuator 12 at the top of the hot water storage tank 3 and by providing a number of small ejection holes in the vertically vertical side walls of the hollow cylindrical shape with a bottom. Since the flow velocity is close to that of the hot water supply pipe 8 and the water 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, causing a rapid drop in the hot water temperature. can be greatly reduced. The performance at this time is shown in Figure 1o.

In the basic action and flow described above, if the flow velocity damping body is tilted or eccentric for some reason, or if one side of the side wall is clogged, the flow will be more biased than the flow velocity damping body. Hot water will be pumped in. In this case, FIG.

The performance shown in FIG. 10 will deteriorate somewhat. Therefore, in order to maintain the performance shown in FIGS. 9 and 10 even under this type of condition, 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 attenuator, the drifted flow is mixed and sent to the outlet pipe in a mixing chamber larger than the volume of the flow rate attenuator, instead of being directly sent to the outlet pipe. It will be alleviated.

Effects of the Invention As described above, the hot water boiler of the present invention provides the following effects.

(1) During boiling, in a steady state, a constant water temperature is sent to the flow rate attenuator and the flow rate attenuator is installed in the moisture chamber of the hot water storage tank, resulting in a jetting condition close to static pressure.
This prevents convection within the hot water storage tank and creates an upper stratification of high-temperature water with very little temperature distribution during boiling, making it possible to obtain high-temperature water in a short time (quick access to high-temperature water), making it easier to use. Improvements can be made.

(2) By using the same flow velocity attenuator as above and providing a large number of small jet holes on the vertical vertical side walls, it is possible to disperse jets and jets with a uniform pressure close to static pressure. It is possible to prevent the contamination of water from spreading in the hot water storage tank, and to stabilize the temperature of hot water when hot water is dispensed.

(3) Even if the ejection conditions from the flow rate attenuator cause a drift in the flow for some reason, the water is mixed in the 1-circular mixing chamber and is sent to the outlet pipe, so the above-mentioned
The objectives can be achieved without significantly impairing the performance of (1) and (2).

(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 I to ensure performance during boiling and dispensing, there is no simple method. The configuration achieves the purpose and can be realized at an extremely low cost.

(4) Since the heating circuits are connected in parallel, complete stoppage of functionality can be avoided even in the unlikely event of a failure.
In addition to its maintenance features, this hot water boiler can be used for household to commercial use.

(6) 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 (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 diagram of the hot water output of the same as above. Figure 5 is a diagram showing the configuration of another conventional example; Figure 6 is a diagram showing the configuration of another conventional hot water boiler; Figure 7 is a configuration diagram of a hot water boiler according to an embodiment of the present invention. , FIG. 8 is an enlarged cross-sectional view of the same essential parts, FIG. 9 is a boiling performance diagram of the same, and FIG. 10 is a hot water temperature steering port of the same. 3...Hot water storage tank, 4a, 4b...Circulation pump, sa, sb...Heat source section, 8...
Hot water supply pipe, 12...Flow rate attenuator, 13...
・Ejection small hole, 16...Mixing chamber. Name of agent Patent attorney Toshio Nakao and 1 other person 1 Figure 1 U% 逼 Kaa Unexamined Publication No. 4 Figure 1 Uki 1 - Door υ 1 Figure 5 Figure 6 ± 5 Kenshi Sekio l Figure 1

Claims (2)

[Claims] (1) It has a mixing chamber with a protruding upper center, a hot water storage tank with a hot water outlet pipe drawn out from the upper end of the mixing chamber, and a flow path having a circulation pump and a heat source part drawn out from the bottom of the hot water storage tank. A hot water boiler in which a flow path is connected to a flow rate attenuator in 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.