JPS5938548A - Hot-water boiler - Google Patents

Abstract

PURPOSE:To prevent a temperature of hot water to be fed at the time of feed of the hot water from reducing suddenly, by connecting a duct pulled out of the lower part of a hot water tank with a flow speed attenuator of the upper part of the inside of the hot water tank through a circulating pump, a heat source part and a flow controlling valve. CONSTITUTION:A taking-in pipe 6 of water provided on the lower part of a hot water tank 3 is ramified into connecting pipes 6a and 6b through a check valve 10, each of which is provided with circulating pumps 4a and 4b and heat source parts 5a and 5b in this order respectively and collected on a connecting pipe 8c. At the initial stage of additional heating, a duct between an orifice plate 22 and a discform movable plate 20 is blocked by contracting a temperature sensing part 18 of a flow controlling valve 16 through sensing of low temperature water at a transitional building-up period of the heat sources 5a and 5b, and as for an opening part it becomes only a small hole part 25 of the orifice plate 22. As for the low temperature water, therefore, at the building- up time of the heat source part, only a very small quantity can be fed to a feed hot water pipe 8. In addition to the above, as it becomes that high temperature water is made to disperse and spout out at a low flow speed by a flow speed attenuator, a temperature of hot water in the inside of the hot water tank 3 is not reduced and a distribution of the temperature of hot water is not spoiled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water boiler that spouts high-temperature hot water from the upper part of a hot water storage tank and stratifies the temperature, and includes side legs that adjust the spout amount depending on the temperature;
This invention relates to a boiler structure equipped with a flow velocity attenuator in the ejection part.

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 sequentially connected by connecting pipes 6, 7, 8, and the connecting pipe 8 is connected to the upper part 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 5 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 especially noticeable when there is a large amount of circulation. The performance in this case is shown in FIG.

Furthermore, when dispensing hot water after a while after boiling, suppose that the heat source section 50 is at the outside temperature (winter Q
Since the instantaneous water heater is used as the heat source, low-temperature water will not be pumped into the 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 the rising performance) decreases compared to the temperature when it is boiled, and the temperature of the hot water that comes out suddenly drops in some parts. An example of this performance is shown in FIG.

Furthermore, since the heat source and the hot water storage tank are separated, the heating circuit is more likely to freeze than the inside of the hot water storage tank when considering freezing prevention during the extremely cold season. Therefore, protective measures can be considered, such as attaching large-capacity electric heaters to 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, the heating circuit is a single path, and as described above, low-temperature water is intermittently mixed into the hot water storage tank, and as the hot water temperature decreases, the temperature distribution increases. If hot water is tapped under this condition, there is a drawback that the hot water will be hot and uneven in temperature.

Next, there is a conventional example as shown in FIG. 6, unless frequent turning on and off, such as during antifreeze operation, is not considered. That is, a bottomless distribution tube 15 is provided at the tip of the hot water supply pipe 8, which has a hollow cylindrical shape and has small holes 14 throughout the side wall.
It consists of the height from the top to the bottom of the hot water storage tank 3. 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 ejection flow velocity is high, the ejected water will be ejected from the lower part of the distribution cylinder 15 both during the transient period of rising and during steady state.

This prevents a sudden drop 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 as a result of heat exchange with the hot water inside the tank, and the temperature at the bottom of the hot water storage tank will increase. The distribution becomes larger, and the area where the water temperature is stable decreases. An example of the performance in this case is shown in FIG. 6, which is somewhat better than the conventional example shown in FIG. but,
As mentioned above, it is frequently turned on and off, such as during antifreeze operation.
If you consider turning it off, you will not be able to maintain the performance shown in FIG. 6, and you will not be able to accomplish your purpose.

These are problems specific to the method of temperature stratifying hot water from the top.

OBJECTS OF THE INVENTION The present invention obviates these drawbacks, and in particular:
Minimize the distribution of hot water temperature during boiling when the circulation flow rate is large, and prevent the sudden drop in hot water temperature and freezing when dispensing hot water, and minimize the uneven dispensing of hot water. The purpose is to

Structure of the Invention In order to achieve this object, the present invention is a hot water boiler in which the heat source and the hot water storage tank are separated and forced convection is carried out using a circulation pump. A flow path having a circulation pump, a heat source, and a flow rate control valve is drawn out from the lower part of the hot water storage tank, and this flow path is connected to a flow rate attenuator at the upper part of the hot water storage tank.

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 using a flow velocity attenuator. By ejecting extremely uniformly in the horizontal direction, temperature stratification of the high-temperature hot water is established and the temperature distribution can be minimized.

In addition, a flow control valve is used to prevent sudden temperature drops due to low-temperature water being mixed in when the heat source starts up when hot water is tapped, and temperature drops due to frequent on/off operations during freezing operation.
This problem was solved by controlling the flow of low-temperature water from the heat source into the upper part of the hot water tank in a small amount, and by combining this with a flow rate attenuator.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 7 to 12. In the figure, parts that are the same as those in FIG. 1, which is a conventional example, are designated by the same numbers as A and J.

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 1o, and circulation pumps 4a and 4b are connected to each other. Pipe ya, 7b, heat source part tsa, 5b, connecting pipe 8a, 8
They are arranged in the order of b and converge in the connecting pipe 8c.

The connecting pipe 8c is connected to the hot water supply pipe 8 via a flow control valve 16.

The hot water storage tank 3 has a mixing chamber 17 whose upper end is concentric with a protruding center, and the tip of the hot water supply pipe 8 is made of a porous material having a plurality of small ejection holes 13 in a hollow cylindrical side wall with a bottom. It is connected to a flow rate attenuator 12 using a water tank 3, and is exposed above the road of the hot water storage tank 3.

The tapping pipe 1 is provided on one side wall of the mixing chamber 17.

The flow rate attenuator 12, which has a hollow cylindrical shape with a bottom, has a large number of small ejection holes 13 on its side wall, and is installed on the road inside the hot water storage tank 3 bound with a porous material to direct high temperature hot water from the hot water supply pipe 8 into the hot water storage tank 3. On the other hand, the hot water is fed vertically from above to below, and the hot water is disposed so that the ejection direction is horizontal to 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 cocks, which are respectively provided on the Jc flow side of the heating circuit.

Also, the flow control valve 16 is made of wax! Enclosed temperature sensing part 18
A disc-shaped movable plate 2o fixed to the orifice plate 22 is positioned close to the orifice plate 22, a spring 19 is arranged between the disc-shaped movable plate 20 and the spring fixed plate 21, and the temperature sensing portion The tip of a pin 23 extending and contracting from the upper end of the pin 18 is brought into contact with a bottle fixing plate 24.

The orifice plate 22 has a small hole 25.

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

(1) At the time of boiling If the water temperature in the hot water storage tank 3 is lower than the set water temperature, the temperature thermistor 9 detects this 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 sa and sb are ignited by detection by flow rate switches (not shown) provided in the heat sources 5a and 6b, and the water is circulated and heated. At this time, heat source parts 5a and 5b
At the initial stage of rising, only a small flow rate is sent into the hot water storage tank 3 through the small hole 25 of the orifice plate 22 due to the detection by the heat sensitive part 18 of the flow rate control valve 16, and the heat source part 5a
, 5b reaches a steady state, a predetermined flow rate is fed into the hot water storage tank 3. After that, when the water temperature at the bottom 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. When the circulation pumps 4a, 4b are stopped, the heat sources sa, 6b are extinguished by detection by the flow rate switches.

In this configuration, the flow rates of the circulation pumps 4a and 4b are constant,
The combustion amount of the heat source parts 5a and 5b is determined by temperature thermistors (not shown) provided in the connecting pipes sa and sb, and is determined so that the temperature of the hot water sent to the flow velocity damping body 12 remains constant during steady state. The amount of combustion is shifted to the proportional side.

During this boiling process, the flow rate attenuator 12 is
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. Although upper stratification of high-temperature water can be achieved, the performance in this case is shown in Figure 11.

(2) When dispensing hot water After the hot water in the hot water storage tank 3 has been boiled to a predetermined temperature (for example, 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 is tapped when the water temperature has dropped and reached the water temperature, low-temperature water is pumped up from the water supply pipe and the hot water reaches a specified temperature from the hot water tap at the top. Hot water is sent out.

After that, the temperature thermistor 9 provided on the side wall of the hot water storage tank 3 is
senses it 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, 5
The heat source section 5a is detected by a flow rate switch (not shown) provided in the heat source section 5a.

6b starts to ignite and reheating begins.

At the beginning of this reheating, the process is similar to the boiling-up described above, but in detail, the low-temperature water during the transient rise of the heat source parts 6a and 5b is used for the flow control valve 16, and the temperature sensing part 18 detects low-temperature water and is in a contracted state (Fig. 9), and the extension force of one spring causes the temperature sensing part 18 to move against the spring fixed plate 21 via the disk-shaped movable plate 20 (Fig. 9). The orifice plate 22 and the disc-shaped movable plate 2
0 is closed, and the only opening is the small hole 26 of the orifice plate 22.

Therefore, only a very small amount of low-temperature water is sent to the hot water pipe 8 when the heat source section starts up. Moreover, the flow rate attenuator causes the water to be dispersed and ejected at a low flow rate, without lowering the hot water temperature in the hot water storage tank 3 and without damaging the hot water temperature distribution.
After that, when the temperature of the water in the heat source section rises, the temperature sensing section 1
8 expands, and by doing the opposite operation to the above, the 1st o
As shown in the figure, the area of the flow passage is expanded, and a predetermined large flow rate of high-temperature hot water is supplied from the hot water supply pipe 8 to the flow rate attenuator 12.
will be sent to. At this time, as described above, the hot water is dispersed and ejected from the flow rate attenuator 12 at a flow rate close to the static pressure, so that upper temperature stratification of the high temperature hot water is established.

Furthermore, in order to prevent freezing during the severe cold season, the heating circuit including the heat source section is operated on and off (not shown); By minimizing the amount of hot water spouted into the hot water storage tank, it is possible to prevent freezing while maintaining uniformity of the temperature of the hot water in the hot water storage tank 3. An example of the performance at this time is shown in FIG.

Effect 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 placed on the road of the hot water storage tank, by using a porous material on the side wall of a hollow cylinder with a bottom. The jetting conditions are close to static pressure, preventing convection within the hot water storage tank, and creating an upper stratification of high-temperature water with very little temperature distribution at the time of boiling, so high-temperature water can be obtained in a short time (high-temperature water can be obtained quickly). ) becomes possible,
Usability can be improved.

(2) By controlling the amount of water emitted by temperature, the amount of low-temperature water ejected from the heat source can be minimized, and in combination with a flow rate attenuator, it can prevent freezing in the coldest months, and even inside the hot water storage tank. 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 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 advantages during maintenance, this hot water boiler can be used for household to commercial purposes.

(4) It is possible to provide a hot water boiler with high thermal energy efficiency, which has a large amount of hot water with stable water 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 diagram of the same boiling performance. 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, and FIG. 7 is a configuration diagram of a hot water boiler according to an embodiment of the present invention.
Figure 8 is a partial enlarged cross-sectional view of the upper part of the hot water storage tank, Figure 9 is a cross-sectional view showing the internal structure of the temperature sensing part of the flow rate control valve when it contracts;
Figure 0 is a cross-sectional view showing the internal structure of the temperature-sensitive part when it expands.
Figure 1 is a boiling performance diagram, and Figure 12 is a hot water temperature performance diagram. 3...Hot water tank, 4a, 4b...Circulation pump, 5a, sb...Heat source section, 8...
Hot water supply pipe, 12...Flow rate attenuator, 13...
・Ejection small hole, 17...Mixing chamber, 16...
・Flow control valve. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure! Figure 2 Figure 3 5 Yibei iJD Ranchuan Guan No. 45! J Shiwaku II=! Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 11 Figure 3% Mi Court Figure 12 Display of Case 1 of Mr. Commissioner of the Patent Office 1982 Patent Application No. 150573 No. 2 Name of invention Hot water boiler 3 Relationship with 41 amendments Patent application
Pillar of Fire Location: 1006 Bold Kadoma, Kadoma City, Tasaka Prefecture Name (582) Representative of Matsushita Electric Industrial Co., Ltd.
Toshihiko Yamashita 4 Agent 571 Address 1006 Bold Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 6 Subject of amendment 6 Contents of amendment (1) The scope of claims of the specification is attached as an attachment Correct and cut as shown. (2) On page 6, line 18, correct [hot water tank at the top center] to ``a hot water tank with a hot water outlet pipe at the top.'' (3) Insert the legal text after "As shown in Figure 12" on page 12, line 16. ``Although in the above embodiment, the hot water supply pipe and the hot water outlet pipe are arranged concentrically, 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 placed in the hot water storage tank. There is nothing good to say.In addition, 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.''2. Claims (1) A water supply pipe is provided at the lower part. A hot water storage tank with a hot water outlet pipe is provided at the top, and from the bottom of the hot water storage tank, a circulation pump, a heat source,
A hot water boiler in which a flow path with a flow control valve is drawn out and the flow path is connected to a flow rate attenuator provided at the upper part of the hot water storage tank. (2) The T-quality water boiler according to claim 1, wherein the flow rate attenuator is concentric with the hot water storage tank, and the high temperature hot water is disposed so that the spouting direction is horizontal to the hot water storage tank.

Claims (2)

[Claims] (1) A hot water storage tank is provided with a water supply pipe at the bottom and the center of the upper end protrudes to form a mixing chamber, and a 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 storage tank, and this flow path A hot water boiler connected to a flow rate attenuator installed in the upper part of the hot water storage tank〇 (2) The hot water boiler according to claim 1, wherein the flow rate attenuator is concentric with the mixing chamber and disposed so that the hot water is ejected in a horizontal direction with respect to the hot water storage tank.