JPH0755173A - Central supplying system for hot water - Google Patents

Abstract

PURPOSE:To reduce energy for returning hot water and reheating it in a boiler and to prevent damage of a protective film in a piping by providing valve means for opening or closing in response to a temperature change and controlling a flow rate constant at the time of opening in a hot water supplying system, and controlling a return hot water amount. CONSTITUTION:A valve to be opened or closed in response to a temperature change such as a two-way valve 3 having a thermostat 4 senses a high temperature of hot water when the hot water is output from a hot water supply cock 16 to close the valve 3, thereby stopping circulation of return hot water to a return hot water pipe 33. When the hot water is not output from the cock 16, the valve senses a low temperature of the hot water to open the valve 3, continuously holds the return hot water amount flowing in the pipe 33 constant by a constant-flow rate valve 2 and suppresses flowing speed of the return hot water. Thus, energy for reheating the return hot water in a boiler 19 can be reduced, and damage of a protective film in the piping can be prevented.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a central hot water supply system.

[0002]

2. Description of the Related Art A conventional central hot water supply system is shown in FIG.
As shown in, there are an upward supply method, a downward supply method, a reverse return method, and the like. In either method, the hot water is always supplied when the hot water tap is opened, so the hot water is constantly circulated in the pipe day and night by the pressure of the circulation pump. That is, hot water is supplied from the hot water storage tank to each hot water supply system via the hot water supply pipe, and hot water not used in this hot water supply system returns to the hot water storage tank via the return hot water pipe and is returned there by the pressure of the circulation pump. The hot water is heated again and pumped again to each hot water supply system. This is repeated day and night to circulate the hot water.

[0003]

However, since the conventional central hot water supply system always circulates the hot water in the pipe, the hot water does not need to be returned to the return pipe, that is, the hot water comes out from the hot water tap. When hot water is constantly returned to the hot water storage tank through the return pipe, there is a problem that the boiler must be constantly reheated to compensate for the temperature drop in the return pipe. There is also a problem that the protective film in the pipe is destroyed by the hot water constantly circulating in the pipe to cause water leakage. Further, when a large amount of hot water is discharged from the hot water tap, there is a problem that a negative pressure is generated in the return pipe and a so-called air hammer phenomenon occurs in the return pipe.

The present invention has been made to solve these problems, and its purpose is to stop the circulation of hot water to the return pipe when hot water is flowing from the hot water tap. When hot water is not coming out of the hot water tap, the amount of hot water circulated to the hot water return pipe is reduced and the flow speed of the hot water return is reduced, reducing the energy required to reheat the hot water in the boiler.
Another object of the present invention is to provide a central hot water supply system capable of preventing the protective film in the pipe from being destroyed.

Another object of the present invention is to temporarily store the return hot water circulated in the return hot water pipe in a circulating tank, and send the hot water stored in the circulating tank to an elevated water tank for comparison in the elevated water tank. A central hot water supply system is provided in which the water temperature is increased by mixing it with cold water made up and supplied to a hot water storage tank and a boiler to save heat energy.

[0006]

The present invention has been made in view of the above objects, and its gist is to provide an elevated water tank and a heating device such as a hot water storage tank and a boiler provided centrally at a specific place. A central hot water supply system for supplying hot water to a plurality of hot water supply systems having a plurality of hot water supply taps provided by circulating hot water by a pump in the pipes and pipes communicating with each other. In addition, there is a central hot water supply system in which the amount of returned hot water can be controlled by providing valve means for opening and closing according to temperature changes and for controlling the flow rate to be constant when opened.

Another aspect of the present invention is, in a building having a plurality of floors, an elevated water tank, a hot water tank and a heating device such as a boiler which are centrally provided in a specific place, and these are connected in series. It is a central hot water supply system that circulates hot water in the hot water supply pipe to multiple hot water supply systems having a plurality of hot water taps, and is provided in a high hierarchy, and the hot water supply systems are provided through the pipes from the respective hot water supply systems. The central hot water supply system has a circulation tank for temporarily storing the returned hot water and a pump for pumping the returned hot water from this tank to the elevated water tank via piping.

[0008]

In the central hot water supply system of the present invention, a valve that opens and closes in response to a change in temperature, for example, a two-way valve equipped with a thermostat, senses a high temperature of hot water when hot water is coming out of the hot water tap and is used as a valve. Close and stop the circulation of hot water to the hot water return pipe. When the hot water is not coming out of the hot water tap, the low temperature of the hot water is sensed to open the valve, and the constant flow rate valve keeps the amount of hot water flowing through the hot water return pipe constant, thus suppressing the flow rate of hot water returned. . Another central hot water supply system of the present invention is
The return water from each hot water supply system is led to the circulation tank installed in the higher floors through the piping, and the hot water temporarily stored in the circulation tank is sent to the elevated water tank through the piping by the pump. .. The return water is mixed with water in the elevated water tank and sent to the hot water storage tank.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing the flow of hot water supplied and returned in the central hot water supply system of the present invention. The central hot water supply system 1 of the present invention includes an expansion tank 10 as an elevated water tank on the roof, a hot water storage tank 18 concentrated on the lowermost D floor such as underground, and a boiler 19 as a heating device.
And, the circulation between the hot water storage tank 18 and the boiler 19 is controlled by the auxiliary pump 17, and the hot water supply plugs 16 arranged in the hot water supply systems 50a, 50b, 50c, 50d on the A to D floors are used for temperature change. A two-way valve 3 provided with a thermostat 4 as a valve means for opening and closing accordingly, and controlling the flow rate to be constant when opened, and a constant flow valve 2 following the two-way valve 3.
The hot water supply system 50a, 50 is provided on the highest floor A
b, 50c, 50d open type circulation tank 5 for storing return hot water, and pump 6 for pumping return hot water from this open type circulation tank 5 to expansion tank 10 via pipe 34
From the hot water storage tank 18 to the hot water supply systems 50a, 50b,
A main part is composed of a main hot water supply pipe 30 for supplying hot water to 50c, 50d and a main return hot water pipe 33 for guiding the return hot water from the hot water supply systems 50a, 50b, 50c, 50d to the open circulation tank 5. To be done.

In the components other than the above, the expansion tank 10
Between the expansion tank 10 and the hot water storage tank 18
The pipe 37 and the water supply pipe 38, which are mutually connected to supply water to the water, and the expansion water and bubbles from the hot water tank 18
There is a bypass pipe 36 for returning to the expansion tank 10 via 8. Further, between the hot water storage tank 18 and the boiler 19, a pipe 39 connected for supplying water from the hot water storage tank 18 to the boiler 19 and a pipe 41 connected for supplying hot water from the boiler 19 to the hot water storage tank 18 are provided. There is. Further, hot water supply systems 50a, 50b, 50c, 50d are provided between the hot water storage tank 18 and the open-type circulation tank 5 as the hot water storage tank 1
Branch pipes 31a, 31b, 31c, 31d connected from the main hot water supply pipe 30 for supplying hot water from 8, and a branch pipe 3 connected to the main return water pipe 33 for returning hot water from these branch pipes
2a, 32b, 32c, 32d.

Main hot water supply pipe 30 and main return hot water pipe 33 on the uppermost A floor
Air bleeding valves 14 and 15 are arranged at the respective upper ends. The open circulation tank 5 is equipped with a sensor 7 that moves the pump when the amount of water in the tank is above a certain level, while the elevated water tank 18 supplies water from the makeup water source 13 when the amount of water in the tank is below a certain level. The sensor 11 for opening the valve 12 arranged in the pipe 35 is provided.

In the above, the constant flow rate valve 2 and the two-way valve 3 having the thermostat 4 are provided in the central hot water supply system for the hot water supply systems 50a, 50b, 50c, respectively.
An invention in which the amount of returned hot water can be controlled by being installed in 50d, an open circulation tank 5 in the central hot water supply system, and a hot water supply system 5
0a, 50b, 50c, 50d return hot water from the main circulating hot water pipe 33 to the open type circulating tank 5 and the open type circulating tank 5 to the expansion tank 10 through the pipe 34 The invention including the pumping pump 6 for carrying out the invention and the invention in which the invention is incorporated into one system are exemplified, but the respective inventions can be implemented separately. Further, as the valve means for opening / closing according to the temperature change and controlling the flow rate at the time of opening, a two-way valve 3 having a thermostat 4 and a separate valve of the constant flow valve 2 are exemplified, but these are not shown. It is also possible to use an integrated valve.

Next, the flow of hot water supply / return in the central hot water supply system 1 will be described. Return hot water and makeup water mixed in the expansion tank 10 are supplied to the hot water storage tank 18 through the pipe 37 and the water supply pipe 38. The mixed water of the returned hot water and water supplied to the hot water storage tank 18 is pressurized by the auxiliary pump 17 and the pipes 39, 4 are provided between the hot water storage tank 18 and the boiler 19.
It is reheated through 1 through repeated circulation to form hot water, which is sent to the main hot water supply pipe 30. This hot water is sequentially passed through the main hot water supply pipe 30 and the branch pipes 31d, 31c, 31b, 31a to the respective hot water supply systems 50d, 50c, 50b, 50a from the lowermost D floor to the uppermost A floor. Supplied. In addition, in the terminal of the main hot water supply pipe 30 on the uppermost A floor,
Air is evacuated by the air bleeding valve 15 before being connected to the branch pipe 31a.

Each hot water supply system 50d, 50c, 50b, 50
In a, the hot water tap 16 is opened to supply hot water.
When hot water is flowing from the hot water storage tank 18, hot water is actively supplied from the hot water storage tank 18 through the main hot water supply pipe 30, so that the temperature of the hot water rises in the hot water supply system. The thermostat 4 senses this temperature rise, closes the two-way valve, and stops the circulation of the return hot water to the main return hot water pipe 33.

When the two-way valve is closed for a certain period of time, and when the hot water tap 16 is closed and no hot water is discharged from the hot water tap, the hot water is supplied from the hot water storage tank 18 through the main hot water supply pipe 30. Since the hot water supply is stopped, the temperature of the hot water drops in the hot water supply system. The temperature decrease is detected by the thermostat 4, the two-way valve 3 is opened, and the hot water is sent to the constant flow valve 2. Here, the constant flow valve 2 includes the branch pipes 32d, 32c, 32.
The amount of the returned hot water from b and 32a to the main returned hot water pipe 33 is limited to a constant value to reduce the flow rate of the returned hot water. As described above, when hot water is coming out of the hot water tap 16, the circulation of hot water to the main return hot water pipe 33 can be stopped, and when hot water is not coming out of the hot water tap 16 it goes to the main hot water return pipe 33. The circulation rate of the hot water can be reduced to reduce the flow rate of the hot water.

Each hot water supply system 50d, 50c, 50b, 50
The hot water returned from a is de-aired by the air vent valve 14 and supplied to the open circulation tank 5. In the open-type circulation tank 5, when the amount of water in the tank exceeds a certain amount, the position sensor 7 detects this and the pumping pump 6 is moved. As a result, the return hot water stored in the open circulation tank 5 is supplied to the expansion tank 10 via the pipe 34.
Here, the amount of hot water supplied from the open circulation tank 5 decreases,
When the water level in the expansion tank 10 drops, the position sensor 11 senses this and opens the valve 35 to replenish the water from the replenishment water source 13 through the pipe 35 to maintain the water level in the expansion tank 10 at a certain level or higher. To be done.

[0018]

Since the central hot water supply system of the present invention is provided with a valve that opens and closes according to temperature changes and a constant flow valve in each hot water supply system, when hot water is coming out of the hot water tap, the hot water is returned. The circulation of hot water to the pipe can be stopped, and also
When the hot water is not discharged from the hot water tap, the circulation amount of the hot water to the main return hot water pipe 33 can be reduced to reduce the flow rate of the hot water return, so that the protective film in the pipe can be prevented from being destroyed. further,
A tank for storing the return water from each hot water supply system is installed in a higher level, and the return water is sent from this tank to the elevated water tank (expansion tank). Therefore, the water supply pipe and return water from the elevated water tank (expansion tank) to the hot water tank The pipe can also be used as a pipe, the return pipe can be shortened, and the heat loss in the return pipe can be reduced. As a result, energy for reheating the return pipe in the boiler can be reduced.

Further, according to the present invention, the hot water that has not come out of the hot water tap is transferred to the elevated water tank (expansion tank) by providing a pump with a pump and a circulation tank between the hot water supply system and the elevated water tank (expansion tank). Put it in and raise the water temperature of the makeup water in it to supplement the heat energy of heating in the boiler.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a flow of hot water supply / return in a central hot water supply system of the present invention.

FIG. 2 (a), (b), (c) is a schematic view showing a flow of hot water supply / return in a conventional central hot water supply system.

[Explanation of symbols]

 1 Central hot water supply system 2 Constant flow valve (valve means) 3 Two-way valve (valve means) 4 Thermostat 5 Open circulation tank 6 Pumping pump 10 Expansion tank (elevated water tank) 16 Hot water tap 17 Auxiliary pump 18 Hot water storage tank 19 Boiler 30 Main Hot water supply pipe 33 Main return hot water pipe 50a, 50b, 50c, 50d Hot water supply system

Claims (2)

[Claims] 1. An elevated water tank, heating equipment such as a hot water storage tank and a boiler provided centrally at a specific place, piping for connecting these, hot water is circulated by a pump in the piping,
A central hot water supply system for supplying hot water to a plurality of hot water supply systems having a plurality of hot water taps provided in the middle of circulation, wherein the hot water supply system is opened / closed according to temperature changes, and the flow rate is controlled to be constant when opened. Central hot water supply system that can control the amount of returned hot water by providing each valve means. 2. In a building having a plurality of layers, an elevated water tank, a hot water tank and a heating device such as a boiler, which are centrally provided at a specific place, and piping for connecting these in series, hot water in the piping It is a central hot water supply system that circulates water to supply hot water to multiple hot water supply systems with multiple hot water taps, and is a high-level circulation tank that temporarily stores return hot water from each hot water supply system via piping. And a central hot water supply system comprising a pump for pumping return hot water from this tank to an elevated water tank via piping.