JPS5986847A - Hot-water boiler - Google Patents

Abstract

PURPOSE:To make initially the layer of hot water heated by a heat source at the upper part of a hot water tank, restrain the heat dissipation loss at minimum level by changing the hot water storage quantity as required, reduce extremely the distribution width of temperature, and decrease the variation of temperature of supplying hot water by a method wherein a hot water flow is expanded with a diffusion plate and an expanding member, or an expanding part of a return pipe, simultaneously the flow velocity is decreased. CONSTITUTION:Hot water is spouted into a hot water tank 1 from a return pipe 6, impacted against a diffusion plate 12, pressed on an expanding member 11 after a flow is changed. In such a manner, the flow is expanded to the extent of the diameter of the expanding member 11, and flowed into the hot water tank 1, as the flow velocity is attenuated, the flowing direction is changed toward the upper part of the hot water tank 1 where the upward buoyancy generated by the difference in density is not strong due to the cold water locating around the expanding member 11 at the starting of heating. Therefore, the layer of the hot water is made initially at the upper part of the hot water tank 1. When the periphery of the expanding member 11 is filled with the hot water after gradual storing of the hot water, the hot water flowed from the expanding member 11 does not have the difference in density, accordingly, the flowing direction does not directed upward, the flow of the hot water is diffused around of the expanding member 11 caused by the reduction of flow velocity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water boiler that uses a hot water storage tank and a hot water boiler as a heat source.

Conventional Structure and Problems As shown in Figure 1, this type of hot water boiler has a hot water tank 1 and a heat source 2 as its main components, and the hot water tank 1 is connected to the heat source 2 by an outgoing pipe 3. , there is a circulation pump 4. A check valve 6 was connected. The heat source 2 and the upper part of the hot water storage tank were still connected by the return pipe 6 to form a circulation path. A water supply lower was provided at the bottom of the hot water storage tank 1, and a hot water supply port 8 was provided at the top.

With this configuration, first, to boil the water in the hot water tank 1,
After water is introduced into the heat source 2 by the circulation pump 4, it is ignited. The water that has passed through the heat source 2 and is heated is sent again to the upper part of the hot water storage tank through the hot water tap 6 and is gradually heated up.

When the set temperature is detected by a thermistor 9 in the lower part 6 of the hot water storage tank 1, the pump 4 is stopped and combustion is also stopped. Also, at the same time when a faucet 1o provided at the tip of the hot water supply port 8 is opened, water flows into the hot water storage tank 1 from a water supply lower directly connected to a water pipe, and hot water is discharged from the hot water supply port 8 like a piston. At this time, when the hot water is continuously tapped and the hot water level is pushed upward, the thermistor 9 detects that the temperature is below the set temperature, and the circulation pump 4 is started to perform additional heating using the heat source 2.

In the above-mentioned hot water boiler, when boiling up the inside of the hot water storage tank, the hot water that blows out from the return pipe 6 is forced to convect inside the hot water storage tank and gradually boils up the whole tank. Even if you do not need the full amount of hot water, you must always store the full amount of hot water.

Therefore, the heat radiation loss from the hot water storage tank, which is characteristic of hot water boilers, cannot be reduced, and the use of the hot water boiler is uneconomical. Also, although it boils the whole thing, due to the difference in density,
Inside the hot water tank 1, hot water temperature distribution tends to occur vertically, and in particular, there is a strong tendency for a layer of high temperature hot water to be formed in the area above the return pipe 6. When hot water is supplied from the hot water storage tank 1 having such a temperature distribution, the hot water temperature changes during hot water supply, which is extremely uncomfortable when using a hot water tank, for example. Also, if all the hot water in the hot water storage tank is used up, that is, the hot water runs out,
In this case, with this type of hot water boiler, the entire hot water storage tank 1 had to be boiled, resulting in a long waiting time.

Purpose of the Invention The present invention solves these conventional problems, and aims to minimize heat radiation loss by stratifying hot water produced from a heat source from the top of a hot water storage tank and varying the amount of stored hot water as necessary. The purpose is to minimize changes in hot water supply temperature by reducing the width of the temperature distribution as much as possible.

Structure of the Invention In order to achieve the above object, the present invention provides a hot water boiler which is equipped with a water supply inlet and a hot water supply inlet.A hot water boiler is provided with a hot water tank, an outgoing pipe, a circulation pump, and a return pipe connected in this order. It is installed at the top of the hot water storage tank, and the return pipe is connected to the top surface of the hot water storage tank, but the cross-sectional area near its tip is expanded, or the cross-sectional area of the flow path is expanded at the same position by a separate member. Furthermore, a diffusion plate is provided within this enlarged portion facing the opening of the return pipe.

With this configuration, the flow rate of the hot water spouted from the return pipe is attenuated by the diffusion plate and the expansion part, and it flows into the hot water storage tank, so although the flow direction is downward, it spreads upward or sideways due to the density difference, so the high temperature hot water is can be stratified from the upper part of the hot water storage tank, and the temperature distribution can also be reduced. Also, for the same reason, the amount of stored hot water can be set freely.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In addition, in the figure, the same parts as in FIG. 4 are given the same numbers.

In the figure, an outgoing pipe is connected to the other lower part of a hot water storage tank 1 with a water supply lower provided at its lower part (~, furthermore, a circulation pump 4, a heat source 2.
Connect in this order to the return pipe 6. A hot water supply port 8 is provided at the top of the hot water storage tank, and a return pipe 6 is connected to the top surface of the hot water storage tank. In this example, return pipe 6
connects its tip directly to the top of hot water tank 1 without enlarging it,
An expanding member 11 is attached inside the hot water storage tank. This member is generally an annular ring with an open bottom end, and a diffusion plate 12 is provided inside thereof facing the opening of the return pipe 6. The thermistor 9 is a thermistor for full hot water storage, and the thermistor 9 is a thermistor for half hot water storage, both of which are fixed to the surface of the hot water storage tank.

In the above configuration, the operation for boiling up the inside of the hot water tank will be explained first. In the figure, the circulation pump 4 is operated to suck water from the lower part of the hot water storage tank through the outgoing pipe 3, and the heat source 2. The return pipe 6 returns to the hot water storage tank 1. Upon detecting this flow, the heat source 2 is ignited and starts combustion.

When the hot water heated by the heat source 2 is ejected into the hot water storage tank 1 from the return pipe 6, it collides with the diffusion plate 12, and the flow is changed sideways or upward and hits the expanding member 11.

Therefore, the flow is expanded to the diameter of the expanding member 1o and flows into the hot water storage tank, but the flow velocity is attenuated, so as shown in Figure 2, when boiling starts, the area around the expanding member is cold water, so it is caused by the density difference. The upward buoyant force is stronger and the direction of the flow changes to the upper part of the tank. For this reason, hot water is stratified from the top of the hot water storage tank. As the hot water gradually accumulates and becomes hot water around the expanding member, as shown in Figure 3, the hot water flowing from the expanding member will no longer have a density difference, so it will not flow upwards, but the flow velocity will be attenuated, so it will flow around the expanding member. Spread. In this way, the hot water is stratified from the top of the hot water storage tank without convection or stirring. For example, when the layer of hot water descends to the position of thermistor 9, it is detected that half of the hot water storage is completed, and the thermistor 9''
! When hot water is stratified in step 1, it is detected that all hot water storage has been completed. Although not shown, the hot water storage amount can be set using a button on the controller or the like.

When a layer of water is formed up to the thermistor 9 during hot water storage, reheating is started, the circulation pump 4 is rotated, and the heat source 2 is ignited again.

Therefore, according to this embodiment, first, during boiling, the flow of the hot water spouted from the return pipe 6 is sufficiently expanded by the diffusion plate 12 and the expansion member 11, and the flow velocity is attenuated, so that convection and
There is no stirring, and the hot water is gradually stratified from the top of the tank. Therefore, by using two thermistors for detecting the hot water temperature in this embodiment, the amount of stored hot water can be divided into two levels.

Therefore, hot water can be stored according to the amount of hot water used, so hot water storage tank 1
It is possible to minimize heat radiation loss and improve economic efficiency. The temperature distribution of stored hot water is still small, so
Changes in hot water temperature are also small, so you won't feel uncomfortable when taking a shower or the like. In addition, in the event that the hot water runs out, the system stores hot water from the top of the tank, so hot water can be obtained in a short time.

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

(1) The flow of hot water from the heat source to the hot water storage tank is expanded by the diffusion plate and the expansion member or the expansion part of the return pipe, and at the same time, the flow velocity is reduced and the hot water flows into the hot water storage tank.

Therefore, the hot water is stratified from the top without convection or stirring in the hot water storage tank, so the amount of hot water stored can be set freely. At the same time, heat radiation loss can be minimized, making it more economical.

(2) Since hot water is stratified from the top of the hot water storage tank, even if the hot water runs out, hot water can be obtained in a short time.

(3) Since hot water is stratified from the top of the hot water storage tank without causing convection, the hot water temperature distribution is small and the hot water supply temperature is stable.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of the hot water boiler of the present invention, Fig. 2 is a schematic diagram of the flow of hot water in the hot water storage tank at the start of boiling, and Fig. 3 is a diagram of the flow of hot water when the expanding member also becomes hot water. This is a schematic diagram of the flow, and FIG. 4 is a sectional view of a conventional hot water boiler. 1...Hot water tank, 2...Heat source, 3...Outgoing pipe, 4
...Circulation pump, 5...Check valve, 6...Return pipe,
7. Water supply port, 8. Hot water supply port, 11. Enlargement member, 12. Diffusion plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A hot water storage tank equipped with a water supply port and a hot water supply port, an outgoing pipe, a circulation pump,
A hot water boiler in which a heat source and a return pipe are connected in this order,
The hot water supply inlet is connected to the top of the hot water storage tank [, the return pipe is connected to the top surface of the hot water storage tank, and the tip of the outlet pipe is either enlarged in diameter or provided with an enlarged member with a flow passage cross-sectional area larger than that of the return pipe; A hot water boiler with a diffuser plate installed inside the expansion section or inside the expansion member.