JPS616537A - Water heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a configuration that contributes to preventing local boiling of hot water boilers used in water heaters and home heating equipment and to improving hot water supply performance.

The structure of the conventional example and its problems In the conventional hot water boiler of this kind, as shown in Figs. A water pipe wall 4 was formed by connecting these water pipes 3, and a combustion chamber 5 was formed inside the water pipe wall 4. The water supply vibro and hot water supply pipe 7 were arranged on the top of the first header 1. 1st header 1
The tip of the water supply vibro located inside was closed, and the water supply port 8 was opened in a curved shape and in a substantially tangential direction of the first header 1. A temperature sensor 9 was installed inside the first header 1. The burner 10 is a combustion chamber 5 on the second header 2 side.
It was located in

Since the high temperature combustion scum generated from the burner 10 exchanges heat with the water tube 3, the inside of the water tube 3 becomes a flow field dominated by natural convection, and the hot water rises and flows into the first header 1. Water 11 is supplied from the water supply port 8 in the tangential direction as shown by the arrow, and since it does not flow through the first pipe 1, it rapidly mixes with the hot water flowing in from the water pipe 3, forming hot water of uniform temperature. Hot water was supplied from hot water pipe 7.

In this configuration, the temperature distribution inside the first header 1 is made uniform by rapid mixing of the water 11 and hot water, so stable temperature detection can be easily performed inside the first header 1.
Although water condensation on the surface of the water pipe 3 can be prevented since water is not directly supplied to the water pipe 3, it has the following problem.

As shown in Figure 3, the temperature inside the water pipe 3 is higher than the hot water temperature because the hot water in the water pipe 3 is mixed with the supplied water 11 and the temperature is lowered before hot water is supplied. Of course. Therefore, if the temperature detector 9 is set so that the hot water temperature is around 80°C, the inside of the water pipe 3 will be in a state where it is difficult to boil. Furthermore, when the hot water supply is stopped, the temperature sensor 9
Due to the delay in extinguishing the burner 10 due to the delay in temperature detection,
The temperature inside the water pipe 3 rises. Therefore, if you set the hot water temperature high and then stop the hot water supply, due to the temperature detection delay,
There was a problem in that local boiling easily occurred within the water pipe 3. Due to this boiling, the first header 1 and the water pipes 3 are likely to corrode, scale will accumulate, and a steam phase will be generated between the water pipes 3 and the water 11, resulting in a decrease in thermal efficiency.

As shown in Figure 3, when water supply is restarted after stopping water supply,
Due to the ignition delay caused by the temperature detection delay of the temperature detector 9, the hot water temperature gradually decreases and it takes time to reach the set hot water temperature again. .

As a solution to the delay in temperature detection by the temperature detector 9, it has been considered to provide the temperature detector 9 inside the water pipe 3, where temperature fluctuations are large and rapid, as shown in FIG. 3, to speed up the temperature detection.

The temperature inside the water pipe 3 is because the amount of canned water inside the water pipe 3 is small.
The temperature is much higher than the temperature inside the first header 1, which is a very thermally unbalanced state. As shown in FIG. 4, since the joint between the first header 1 and the water pipe 3 has a shape that expands rapidly with respect to the flow of water 11, thinning occurs at the joint on the water pipe 3 side. , the water 11 may descend through the water pipe 3 so as to be caught up in this thin layer. Due to the thermal imbalance and thinness of the temperature inside the water pipe 3, the amount of water 11 descending inside the water pipe 3 becomes unstable, and the temperature inside the water pipe 3 may suddenly change by about 10°C. Further, when starting water supply again after hot water supply is stopped, the temperature of the first henocooler 1 decreases faster than that of the water pipe 3. Therefore, providing the temperature sensor 9 inside the water pipe 3 does not allow stable temperature detection.

OBJECT OF THE INVENTION The present invention solves such problems in the prior art, and has a structure in which hot water flows from a water pipe equipped with a temperature sensor or from the second header side to the first header, thereby stabilizing the temperature inside the water pipe. This reduces the temperature detection delay.

Structure of the Invention A first header and a second header formed in an annular shape are connected by a large number of water pipes, and a water supply pipe and a hot water supply pipe are provided in this first header, and this water supply pipe passes through the inside of the first header, and The tip of the water tube into which the water supply pipe is inserted and the tip of the water tube provided with the temperature sensor are connected by a U-bend, and the water supply pipe is connected to the tip and the first tip.
It has a water inlet opening on the peripheral surface facing the header.

With this configuration, water supplied from the water supply port opened at the tip of the water supply pipe passes through the U-bend and rises while being heated inside the water pipe provided with the temperature sensor, forming a stable temperature distribution. When the water supply is restarted after the hot water supply is stopped, the water immediately cools the temperature sensor. On the other hand, the water supplied from the water supply port opened on the circumferential surface of the water supply pipe rapidly mixes with the hot water rising from the water pipe, and the water is supplied from the hot water pipe. One embodiment will be explained using FIG. 5 and FIG. 6. In Figures 5 and 6, the water supply vibro passes through the first header 1, is inserted into the water pipe 3a, has its tip constricted, and has an open water supply port 8a and a water supply opened on the circumferential surface facing the first ladder 1. It has a mouth 8b. The water pipe 3a and the water pipe 3b provided with a temperature sensor 9 are connected within the second header 2 using a U/do 12. Note that the same members as in FIG. 1 are given the same numbers.

”- In the configuration described above, water 11 supplied from the water supply port 8a
The water rises from the tip of the water pipe 3a through the U-bend 12 while being heated, and the closer it gets to the first header 1, the higher the temperature becomes. Inside the water pipe 3b, a well-balanced temperature distribution is always formed, which is dominated by forced convection. Water pipe 3
Since the amount of water in the tank b is small, temperature fluctuations during intermittent operation of the burner 10 are large and severe, so that the temperature detector 9 detects the temperature quickly. Therefore, the delay in extinguishing the burner 10 is shortened, and local boiling within the water pipe 3 does not occur immediately after hot water supply is stopped. Since the water supply vibro is inserted in the water pipe 3a, the amount of water in the can is extremely small, or heat is always taken away by the water supply vibro, and the temperature is relatively low, so local boiling is unlikely to occur.

When the water supply is started again after the Ml is stopped, the water 11 immediately cools the temperature sensor 9, so the temperature detection of the temperature sensor 9 becomes faster, and the ignition delay of the burner 10 is shortened. therefore,
The time required to obtain the set hot water temperature is shortened.

Effects of the Invention As described above, according to the hot water boiler of the present invention, the following effects can be obtained.

Since the water supplied is heated and rises inside the water pipe equipped with a temperature sensor, a thermally balanced temperature distribution dominated by forced convection can always be formed within the water pipe. However, when the burner is in adiabatic operation,
Vigorous temperature fluctuations shorten the temperature detection delay, making it easier to prevent local boiling.

When the water supply is restarted after stopping the hot water supply, the temperature sensor is immediately cooled down, so the temperature is detected quickly, the burner ignition delay is shortened, and the time required to obtain the set hot water supply temperature is shortened.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventional water boiler, Figure 2 is a partially sectional plan view of Figure 1, Figure 3 is a temperature distribution characteristic diagram of a hot water boiler, and Figure 4 is the main part of Figure 1. An enlarged sectional view, FIG. 5 is a vertical sectional view of a hot water boiler according to an embodiment of the present invention, and FIG.
FIG. 2 is a partially sectional plan view of the figure. 1.・Ivy to the 1st header”-12・・2nd header, 3a,
3b... Water pipe, 6... Water supply pipe, 7... Hot water supply pipe, 8a, 8b - Water supply port, 9... Temperature detector, 12... U-bend. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 4 Figure 5

Claims (2)

[Claims] (1) A first header and a second header formed in an annular shape are connected by a large number of water pipes, and a water supply pipe and a hot water supply pipe are provided in this first header, and this water supply pipe passes through the inside of the first header and The tip of the water tube into which the water supply pipe is inserted and the tip of the water tube provided with the temperature sensor are connected by a U-bend, and the water supply pipe has a peripheral surface facing the tip and the first header. A hot water boiler with a water supply opening that opens at the top. (2) The hot water boiler according to claim 1, wherein the water supply port opened at the tip of the water supply pipe is formed to have a smaller area than the water supply port opened at the peripheral surface.