JPH01217151A - Hot water accumulation variable feeder - Google Patents

Abstract

PURPOSE:To eliminate a circulation pump, reduce a facility expenditure and an operating expenditure and decrease a noise and a vibration by a method wherein a hot water storing pipe communicating an upper part of a heat exchanger arranged below a hot water storing part with an upper part of the hot water storing part is provided with a valve means to be opened or closed in response to a temperature of the hot water. CONSTITUTION:A cylindrical hot water storing tank 1 is provided, at its lower portion, with a heat exchanging part 18 defined by an upper convex conical surface 19 and contacting with a bottom surface 20 and an upper portion of the conical surface 19 is applied as a hot water storing part 11. A hot water storing pipe 7 provided with an opening 21 is arranged substantially vertically at an upper part of the hot water storing part 11 and a valve means 13 is arranged at a lower inner part of the hot water storing pipe 7. When a temperature of the stored hot water within the hot water storing tank 1 is lower than a predetermined value, a control device 9 may energize a combustion unit 10 so as to heat the stored hot water within the heat exchanger 18 through the bottom surface 20 of the hot water storing tank 1. As the heated hot water stored in it is increased, the valve means 13 having a shape memory alloy spring 14 is opened, an upper part of the heat exchanging part 18 and another upper part of the hot water storing tank 11 are communicated with each other through the hot water storing pipe 7. As the hot water storing part 11 is higher than a predetermined temperature and its signal is inputted to the control device 9, the control device 9 may stop the combustion unit 10 and then the valve means 13 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable hot water storage capacity water heater, and more particularly to a variable storage capacity water heater that raises the temperature of stored hot water through natural circulation.

[Conventional technology]

As a variable hot water storage amount water heater, a device shown in FIG. 4 is conventionally known. This water heater with variable hot water storage capacity.

It is equipped with a hot water storage tank 1 that is always filled with water or hot water, a water supply pipe 4 connected to the lower part of the hot water storage tank 1 and having a circulation pump 5 interposed therein, and a heating means IO connected to the water supply pipe 4. a heat exchanger 6, a hot water storage pipe 7 that connects the heat exchanger 6 to the upper part of the hot water storage tank 1, and a hot water storage pipe 7 that is installed approximately at the vertical center of the hot water storage tank 1 to measure the water temperature in the hot water storage tank and generate a temperature signal. A half-boiling thermometer 2 that outputs an output, and a full-boiling thermometer 3 that is placed at the bottom of the hot water storage tank 1 and measures the water temperature in the hot water storage tank and outputs a temperature signal.

The temperature at which the half-boiling thermostat 2 outputs the temperature signal input to the control device 9 and the y control device 9, which control the circulation pump 5 and the heating means IO based on the temperature signal output by the half-boiling thermostat 2 or the full-boiling thermostat 3 A hot water storage amount changeover switch 8 that switches between the signal and the temperature signal output by the full-boiling thermometer 3;
and a hot water extraction pipe 32 connected to the top of the hot water storage tank 1 to take out the stored hot water from the hot water storage tank 1.

In operation of this hot water storage type water heater, first, either half-boiling or full-boiling is selected by the hot water storage amount changeover switch, and the temperature signal output by half-boiling thermostat 2 or full-boiling thermostat 3 is controlled accordingly. It is input into the device 9. Control bag? If the value of the input temperature signal is lower than a predetermined value, f9 starts the circulation pump 5 and circulates the water in the tank in the order of water supply pipe - circulation pump - heat exchanger - hot water storage type water heater. At the same time, the heating means 10 is activated to heat the water flowing inside the heat exchanger 6. The heated and heated hot water flows into the upper part of the hot water storage tank 1 through the hot water storage pipe 7, and as the circulation pump 5 and heating means 10 continue to operate, the amount of hot water in the upper part of the hot water storage tank 1 increases.

The amount of hot water stored in the upper part of the hot water tank 1 gradually increases,
When the temperature signal output by the selected one of the half-boiling thermostat 2 and the full-boiling thermostat 3 exceeds a predetermined value, the control device 9 stops the circulation pump 5 and the heating means 10.

[Problem to be solved by the invention]

The above-mentioned conventional technology requires a circulation pump for sending the water in the hot water storage tank 1 to the heat exchanger 6 and a device to control this pump, and the corresponding cost, weight, and operating cost are required. Was. Also.

Since water is always in the water supply pipe 4 and hot water storage pipe 7,
Measures were required to prevent freezing, and measures were also required to prevent noise and vibration generated by the circulation pump 5.

An object of the present invention is to provide a variable hot water storage capacity water heater that does not require a circulation pump.

(Means for solving a!In) The above problem involves a hot water storage section equipped with a hot water temperature sensor.

and a heat exchange unit equipped with a heating means for heating the stored hot water.

A hot water storage variable amount water heater comprising: a hot water storage pipe that communicates a hot water outlet of the heat exchange section with the hot water storage section; and a water supply pipe that communicates the hot water inlet of the heat exchange section with the hot water storage section. ,
The heat exchange section is disposed below the hot water storage section, and the hot water storage pipe is connected to an upper part of the heat exchange section and opens at a predetermined first temperature or higher, and the hot water storage pipe is opened at a predetermined first temperature or higher. This is achieved by a water heater with variable storage amount of hot water, characterized in that a valve means that closes at a temperature below a second temperature is provided, and one end of the hot water storage pipe is opened at an upper part of the hot water storage section. .

Further, it is preferable that the hot water storage section and the heat exchange section be housed in one hot water storage tank. In that case, the heat exchange section is provided above the bottom surface of the hot water storage tank, and the heating means is provided. It is preferable to provide it below the bottom surface.

Furthermore, it is effective to make the upper surface of the heat exchanger an upwardly convex surface and connect the hot water storage pipe to the apex position of this surface. When the heat exchange part is provided above and in contact with the bottom surface of the hot water storage tank, the water supply pipe is preferably provided in contact with the bottom surface of the hot water storage tank, and the bottom surface is formed as a part of the peripheral wall of the water supply pipe to form the water supply pipe.

[action] The present invention will be described in detail with reference to FIG.

When the heating means 10 is driven to heat the heat exchange section 18, the temperature of the low-temperature stored hot water contained in the heat exchange section 18 is raised;
The hot water rises to the top of the heat exchange section and flows into the valve means 13 provided in the hot water storage pipe 7 connected to the top of the heat exchange section. When the temperature of the stored hot water in contact with the valve means 13 rises and exceeds the first set value, the valve means 13 opens. The heat exchange section 18 is provided below the hot water storage section 11, and the hot water storage pipe 7 is connected to the heat exchange section 1.
8 and opens at the top of the hot water storage section 11, the hot water whose temperature has increased and its specific gravity has become smaller rises in the hot water storage pipe 7 when the valve means 13 opens, and is stored at the top of the hot water storage section 11. Hot water flows into the storage section 11 from an opening provided at the top of the section 11 . The high-temperature stored water that has flowed into the hot water storage section 11 is
An amount of low-temperature stored water stored in the upper part of the hot water section 11 and equal to the water flow flowing into the hot water storage section 11 from the hot water storage pipe 7 flows into the heat exchange section from the lower part of the hot water storage section 11 via the water supply pipe 4 and is heated. Ru.

The heated stored hot water passes through the valve means 13.

The hot water flows into the upper part of the hot water storage section 11 through the hot water storage pipe 7 . This flow continues, and hot water having a temperature exceeding the first set value is stored in the hot water storage section 11.

The hot water storage section and heat exchange section are housed in one hot water storage tank.

When the hot water storage pipe is disposed within the hot water storage section, the amount of heat dissipated to the outside from the hot water storage pipe and the heat exchange section is reduced. Further, by providing the heat exchange section in contact with the bottom surface of the hot water storage tank and providing the heating means below the bottom surface, the stored hot water can be easily heated through the bottom surface of the hot water storage tank. Furthermore, if the upper surface of the heat exchange part is an upwardly convex surface and a hot water storage pipe is connected to the top of this surface, the heated and rising hot water will flow along the upwardly convex surface and reach the hot water storage pipe. The flow of stored hot water becomes smoother. Also.

When the water supply pipe is formed by using the bottom of the hot water storage tank as part of the peripheral wall of the water supply pipe, the water supply pipe is installed at the lowest part of the hot water storage section, and there is no blind spot in the hot water circulation in the hot water storage tank.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on FIG. 1 and FIG. 21.

A cylindrical hot water storage tank 1 has a conical surface 1 convex upward at its lower part.
9 and includes a heat exchange section 18 in contact with the bottom surface 20.
The upper part of the conical surface 19 is the hot water storage part 11. An opening is provided in a portion of the conical surface 19 that is in contact with the bottom surface 20 of the hot water storage tank, and the hot water storage portion l is connected to the opening and the bottom surface 20 is used as a part of the peripheral wall.
A water supply pipe 4 is provided that communicates the lowermost part of the heat exchange section 18 with the heat exchange section 18. On the side wall of the hot water storage section 11, a half-boiling thermometer 2 and a full-boiling thermometer 3, which are hot water temperature detectors that detect the temperature of the hot water and output a temperature signal, are arranged at approximately the center and lower part of the height thereof, respectively. and both are connected to the control device 9. A hot water storage amount changeover switch 8 is connected to the control device 9 to select which of the half-boiling thermostat 2 and the full-boiling thermostat 3 should be used as the temperature signal input to the control device 9 . Below the bottom 20 of the hot water tank 1,
A combustor lO, which is a heating means for heating the hot water stored in the heat exchange section 18 via this bottom surface 20, is provided. 31 is connected. Combustion of the combustor 10 is controlled by a control device 9. A hot water storage outlet pipe 32 is provided at the top of the hot water storage tank 1.

An opening is provided at the apex position of the conical surface 19, and connected to this opening, a substantially straight hot water storage pipe 7 having an opening 21 at the top of the hot water storage section 11 is provided almost vertically. Further, a valve means 13 is installed inside the lower part of the hot water storage pipe 7.

This valve means 13 is installed in the hot water storage pipe 7 and has an orifice 16 having an opening on the side of the heat exchange section.

Perforated spring seats 22 and 23 installed above and below the orifice 16, a valve body 15 whose valve seat 24 is the opening inclined surface of the orifice 16 on the heat exchange section side, and a valve seat 24 that is connected to the upper surface of the perforated spring seat 23. It consists of a shape memory alloy spring 14 mounted between the body 15 and a spring 17 mounted between the lower surface of the perforated spring seat 22 and the valve body 15. The shape memory alloy spring 14 is long at low temperatures and contracts at high temperatures.
On the other hand, the spring 17 acts to attract the valve body 15 to the valve seat 24 in either case.

Next, the operation of this embodiment will be explained. The hot water storage tank 1 is always filled with water (stored water) through the supplementary water pipe 31, and is in a half-boiling thermostat 2 and a full boiling thermostat 3.
Both detect the temperature of the hot water stored in the hot water storage tank 1 and output it as a temperature signal. However, the hot water storage amount changeover switch 8 serves as a temperature signal input to the control device 9.
If the temperature signal on the selected side is lower than a predetermined value, the control device 9 selects one of the half-boiling thermostat 2 signal and the full-boiling thermostat 3 signal. 10, and through the bottom 2° of the hot water tank 1,
The hot water stored in the heat exchange section 18 is heated.

Since the heated hot water has a lower specific gravity, it rises within the heat exchanger 18 and moves along the conical surface 19 to the entrance of the hot water storage pipe 7. The hot water stored at high temperature flows into the inlet of the hot water storage pipe 7 and comes into contact with the shape memory alloy spring 14 that constitutes the valve means 13. When the temperature of the stored hot water in contact with the shape memory alloy spring 14 gradually increases due to the heating of the combustor 10, and the temperature of the stored hot water exceeds the first set value, the shape memory effect of the spring 14 causes the temperature of the spring 14 to increase. The shrinking force overcomes the shrinking force of the spring 17 and the valve body 15 separates from the valve seat 24, causing the valve means 13 to move away from the valve seat 24.
is opened, and the upper part of the heat exchange part 18 and the upper part of the hot water storage part 11 are communicated via the hot water storage pipe 7.

When the valve means 13 opens, the stored hot water with a temperature higher than the first set value that gathers in the upper part of the heat exchanger 18 flows inside the hot water storage pipe 7 due to the difference in specific gravity with the lower temperature stored water in the hot water storage part. The hot water rises and flows into the upper part of the hot water storage section 11 through the opening 21. On the other hand, as the high-temperature stored water flows into the hot water storage section 11, an equal amount of low-temperature stored water flows into the heat exchange section 18 through the water supply pipe 4' from the lower part of the hot water storage section and is heated. As the high-temperature stored water continues to flow into the upper part of the hot-water storage section 11 in this way, the hot-water storage section that was previously occupied by low-temperature stored water is replaced with high-temperature stored water from the upper part, and at a certain point, the The selected temperature signal becomes higher than the predetermined temperature. When a high temperature signal/signal is input to the control device 9 by a predetermined temperature signal, the control device 9
The combustor 10 is stopped.

In this state, when high-temperature stored water is taken out from the hot water storage tank via the hot water take-out pipe 32, new stored hot water is replenished into the hot water storage section from the water replenishment pipe 31 according to the amount of water taken out. Since this new make-up water is supplied to the lower part of the hot water storage section 11, it is not mixed with the stored high temperature hot water and the temperature of the high temperature hot water does not drop. As the high-temperature stored water is taken out, the stored water in the hot water storage pipe 7 rises somewhat, but when the stored hot water in the heat exchanger, which is lower in temperature than the second set value, reaches the valve means 13, the spring 14 is activated. Stretch, spring 1
The shrinking force of 7 overcomes the spring 14, causing the valve body 15 to close to the valve seat 2.
4, the valve means 13 closes.

In this embodiment, since a valve means that operates depending on the temperature is provided, a constant hot water storage temperature can be obtained regardless of the initial temperature of the hot water storage tank. Furthermore, by changing the temperature characteristics of the valve means, the hot water storage temperature can also be changed. The valve means may be a wax valve that utilizes expansion of wax. Although the number of hot water storage temperature detectors is two, by increasing the number, more fine-grained control of the amount of hot water storage is possible. In addition, the hot water storage section and the heat exchange section are housed in one hot water storage tank with the conical surface 19 as the boundary, and the hot water storage pipe 7 is arranged inside the hot water storage section, so that the amount of heat dissipated to the outside is reduced, and the amount of heat dissipated to the outside is reduced. There are no exposed pipes, and the risk of freezing is eliminated.6 Also, the floor space occupied can be reduced. The heat exchange section is provided above the bottom surface of the hot water storage tank, and the combustor that heats the stored water via the bottom surface is provided, so the structure of the heat exchange section is simplified and the structure of the hot water storage tank is When the heights were the same, the volume of the hot water storage section could be maximized. moreover.

The upper surface of the heat exchanger is made into a conical surface, and an opening is provided at the apex of this conical surface to connect the hot water storage pipe, so that the flow of the stored hot water in the heat exchanger becomes smooth. A similar effect can be obtained by using the conical surface as a pyramidal surface. In addition, since a water supply pipe is provided in contact with the bottom of the hot water storage tank, and the bottom is formed as a part of the peripheral wall, the lowest part of the hot water storage section and the heat exchange section are communicated, and a blind spot in the circulation of the stored water is eliminated. do not have. In general, a circulation pump and a control device for the circulation pump are no longer required, and equipment and operating costs are reduced.
As well as reducing noise and vibration, breakdowns are reduced and the life of the water heater is extended.

In addition, if the replenishment pipe 31 is provided with a ring-shaped replenishment inner pipe 31A as shown in Fig. 3, and this is provided with a large number of small holes 31B, the generation of turbulence in the hot water tank due to replenishment water will be reduced. .

〔Effect of the invention〕

According to the present invention, the heat exchange section is provided below the hot water storage section, a hot water storage pipe that communicates the upper part of the heat exchange section and the upper part of the hot water storage section is provided, and a valve means that is opened and closed depending on the temperature is provided in this hot water storage pipe. Therefore, regardless of the initial temperature in the hot water storage tank, it is possible to flow hot water at the desired temperature into the hot water storage section due to the difference in specific gravity, which eliminates the need for a circulation pump, reduces equipment and operating costs, and reduces noise and vibration. effective.

Furthermore, by incorporating the hot water storage section and the heat exchange section into one hot water storage tank, the installation area can be reduced and the amount of heat dissipated to the outside can be reduced.

When the heat exchange section is provided in contact with the bottom of the hot water storage tank and the heating means is provided below the bottom surface, the structure of the heat exchange section is simplified and the capacity of the hot water storage tank can be utilized as a hot water storage section to the maximum. .

In addition, by making the top surface of the heat exchanger an upwardly convex surface and connecting the hot water storage pipes with an opening at the apex of this surface, the flow of the stored hot water inside the heat exchanger will be smoother and the resistance to natural circulation will be reduced. It has the effect of

Furthermore, if the water supply pipe is formed with the bottom surface of the hot water storage tank as part of its peripheral wall, there is no blind spot in the hot water storage section for the circulation of the hot water, and the storage volume of high temperature water can be maximized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a partial sectional view showing the part of FIG. 1, and FIG. 3 is a part showing a part of another embodiment of the invention. FIG. 4 is a cross-sectional view showing an example of the prior art. 1... Hot water storage tank, 2... Hot water storage temperature detector (half-boiling thermostat), 3... Hot water storage humidity detector (full boiling thermostat), 4...
... Water supply pipe, 7... Hot water storage pipe, lO... Heating means (combustor). DESCRIPTION OF SYMBOLS 11...Hot water storage part, 13...Valve means, 18...Heat exchange part, 19...Upwardly convex surface (conical surface), 20...
Bottom surface, 21... Opening of hot water storage pipe. (Physician Tatsuyuki Unuma

Claims (1)

[Claims] 1. A hot water storage unit equipped with a hot water temperature detector, a heat exchange unit equipped with a heating means for heating the stored hot water, and a hot water outlet of the heat exchange unit communicating with the hot water storage unit. In the variable hot water storage water heater including a hot water storage pipe and a water supply pipe that communicates a hot water inlet of the heat exchange section with the hot water storage section, the heat exchange section is disposed below the hot water storage section. In addition, the hot water storage pipe is connected to the upper part of the heat exchange section, and opens when the temperature inside the hot water storage pipe rises and exceeds the first set value, and decreases to below the second set value. 1. A water heater with a variable storage amount of hot water, characterized in that a valve means that closes when the hot water storage section is turned off is installed, and one end of the hot water storage pipe is opened at an upper part of the hot water storage section. 2. The variable hot water storage amount water heater according to claim 1, wherein the hot water storage section and the heat exchange section are housed in one hot water storage tank, and the hot water storage pipe is disposed within the hot water storage section. 3. A claim characterized in that a heat exchange section is provided above the bottom surface of the hot water storage tank in contact with the bottom surface thereof, and a heating means for heating the heat exchange section is provided below the bottom surface of the hot water storage tank. The variable hot water storage amount water heater according to item 2. 4. The heat exchanger according to claim 1, 2 or 3, characterized in that the upper surface of the heat exchange part is an upwardly convex surface, and a hot water storage pipe is connected to the apex position of the surface. Water heater with variable storage capacity. 5. The variable hot water storage water heater according to claim 2 or 3, wherein the water supply pipe is formed with the bottom surface of the hot water storage tank as part of its peripheral wall.