JP2001235163A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hot water supply system in which breakage of a circulation pump, a branch pipe, a hot water tap and the like and damages due to water leakage or the like caused by such a breakage are avoided by preventing pressure within a pipe from rising abnormally. SOLUTION: A hot water supply main pipe line 1 is connected to a primary side chamber 3a of a heat exchange means 3, and a hot water supply circulation branch pipe line 4 having supplied hot water using means 5a, 5b is connected with a secondary side chamber 3b of the heat exchange means 3. The hot water supply circulation branch pipe line 4 is provided with a supplied hot water circulation means 6 and connected with a water replenishing pipe 7 branched from the hot water supply main pipe line 1. The hot water replenishing pipe 7 is provided with a supplied hot water metering means 8. Excess supply hot water discharge means 10, 11, 12 are provided for discharging excess supply hot water from the supplied hot water circulation branch pipe line 4 and/or the heat exchanger means 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system applied to, for example, an apartment house.

[0002]

2. Description of the Related Art For example, in an apartment house or the like, a central hot water supply system for branching from a hot water supply main pipe to supply hot water to each dwelling unit and measuring the amount of hot water used for each dwelling unit by a hot water meter is as follows. There were systems, each of which had problems. (1) The hot water supply branch pipe in the dwelling unit is a circulation path that branches from the hot water supply main pipe, passes through each hot water supply use point in the dwelling unit, and then joins the hot water return main pipe, and two locations immediately after the branch and immediately before the junction. The system measures the difference between the two hot water meters by measuring the amount of hot water used. In this system, since two hot water meters are used, a measurement error occurs in each hot water meter, and it is not possible to calculate an accurate amount of hot water used by the two hot water meters in a path in which hot water circulates constantly. Even when the hot water meter is not used, it is erroneously integrated and weighed due to an error of the hot water meter). (2) The hot water supply branch pipe in the dwelling unit is branched from the hot water supply side main pipe to supply hot water to each hot water supply point in the dwelling unit, but without using the hot water supply branch pipe in the dwelling unit as a circulation path of the hot water supply. A system for measuring hot water usage by installing a hot water meter immediately after branching of a hot water supply branch pipe in a dwelling unit from the hot water supply main pipe without returning hot water to the hot water return side main pipe. In the case of this system, hot water is not circulating after branching of the hot water supply branch pipe in the dwelling unit from the hot water supply side main pipe. There has been a problem that cold hot water is discharged.

[0003] In order to solve the above problems,
A hot water supply system disclosed in Japanese Patent Application Laid-Open No. 3-291428 (hereinafter referred to as a hot water supply system of the prior application) has been proposed. In the hot water supply system of the prior application, hot water is forcedly circulated by a circulating pump using a branch pipe line in the dwelling unit as a circulation path independent of the hot water main pipe, and heat exchange with the hot water main pipe is always performed by a heat exchanger. The branch pipe line in the dwelling unit is connected by a makeup water pipe, and a hot water meter is installed in the makeup water pipe.

According to such a hot water supply system of the prior application,
Even if the hot water is not used for a long time, the hot water in the branch pipes inside the dwelling unit is always warmed, so the hot water at the beginning of use will not be cold, and the supply water pipe will measure the amount of hot water used. Is not a circulation path of hot water, so that there is obtained an effect that there is no problem of measurement error of hot water usage.

[0005]

Since the hot water supply system of the prior application is configured as described above, the following points must be considered in order to make the hot water supply system practical and efficient. It turned out that there was. That is, even though the hot water in the branch pipe is still sufficiently warm, the constant operation of the circulating pump increases the burden on the user such as electricity costs. When the temperature is still sufficiently warm, it is necessary to control ON / OFF of the circulation pump.

The hot water supply system of the prior application functions normally without any problem. However, in the following cases, there is a problem that a phenomenon occurs in which the pressure in the hot water circulation pipe increases abnormally. At the time of periodic inspection, when the hot water in the hot water supply circulation pipe is once drained and inspected, then refilled and heated again. In case of absence for a long time, stop the circulation pump and go out,
When the circulation pump is started again when returning home to raise the temperature of hot water in the hot water circulation circuit. In other words, when the temperature of hot water that has been completely cooled is raised, the volume of the hot water expands.However, there is no way to release the hot water pressure in the hot water circulation line by a check valve, etc. The phenomenon that rises occurs. After, 20 ℃
When the temperature is raised from 40 ° C. to 45 ° C., the pressure in the pipe may exceed 1 MPa.

[0007] When the above-mentioned abnormal increase in the pipe pressure occurs, an excessive load is applied to the circulating pump and the branch pipe line, so that the circulating pump and the branch pipe line may be damaged. This may result in damage to the hot water tap or damage to the hot water tap, resulting in occupants suffering large physical damage due to water leakage. Also, even if the equipment etc. does not lead to damage,
When the resident opens the water tap when the pressure inside the pipe is high,
In the worst case, there is a risk that the resident may be burned because the hot water discharges abnormally.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can prevent an abnormal increase in pipe pressure, and can prevent a circulating pump, a branch pipe line, a hot water tap, etc. caused by an abnormal rise in pipe pressure. It is an object of the present invention to provide a hot water supply system capable of preventing breakage and damage due to water leakage or the like resulting from the breakage.

Another object of the present invention is to provide a hot water supply system which can prevent abnormal discharge of hot water and has no danger of occupants getting burned.

[0010]

A hot water supply system according to the present invention comprises connecting a hot water supply main line for supplying hot water to the primary side chamber of the heat exchange means having a primary side chamber and a secondary side chamber;
A hot water circulation branch pipe for supplying hot water to the hot water use means is connected to the secondary side chamber, and a hot water circulation means for forcibly circulating hot water is provided in the hot water circulation branch pipe, and the hot water main pipe is provided. A supply water pipe for supplying hot water which is branched from the hot water supply pipe, and the supply water pipe is provided with a hot water supply measuring means, and discharges excess hot water from the hot water circulation branch pipe line and / or the heat exchange means. Means.

In the hot water supply system according to the present invention, surplus hot water supply means is constituted by a communication pipe communicating the primary chamber and the secondary chamber of the heat exchange means, and a backflow prevention means provided in the communication pipe. .

In the hot water supply system according to the present invention, a surplus hot water supply means is constituted by a communication pipe for communicating the main hot water supply pipe and the hot water supply circulation branch pipe, and a backflow prevention means provided in the communication pipe.

In the hot water supply system according to the present invention, a pressure relief valve is provided in a hot water circulation branch pipe as surplus hot water supply means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a schematic configuration diagram showing the entire hot water supply system according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged sectional view showing the heat exchanger in FIG. In FIG. 1, reference numeral 1 denotes a primary hot water supply main pipeline, reference numeral 2 denotes a secondary hot water supply main pipeline, and reference numeral 3 denotes a heat exchanger (heat exchange means). As shown in FIG. 3a and a secondary side chamber 3b, the primary side hot water supply main pipeline 1 is connected to the primary side of the primary side chamber 3a, and the secondary side hot water supply is connected to the secondary side of the primary side chamber 3a. The main pipeline 2 is connected.

Reference numeral 4 denotes a hot water supply circulation branch pipe connected to the secondary side chamber 3b of the heat exchanger 3, and 5a and 5b branch as hot water supply branch means from the hot water supply circulation branch pipe 4 to supply hot water. The hot water taps 5a and 5b may be provided at any number of locations as long as they are on the hot water circulation branch pipe 4.
The installation location is not specified. A circulation pump 6 is provided in the hot water supply circulation branch pipe 4 and serves as hot water circulation means for forcibly circulating hot water. In the case of this circulation pump 6 as well, the installation location is on the hot water circulation branch pipe 4. Anywhere.

Reference numeral 7 denotes a supply water pipe branched from the primary hot water supply main pipe 1 and connected to the hot water supply circulation branch pipe 4. The supply water pipe 7 is connected from the hot water supply main pipe 1 to the hot water supply circulation branch pipe 4. It supplies hot water and has a water meter 8 as a hot water metering means and a check valve 9 located on the secondary side of the water meter 8. Here, the check valve 9 located on the secondary side of the water meter 8 on the make-up water pipe 7 as described above is a backflow prevention means for preventing a backflow from the hot water circulation branch pipe 4 to the hot water main pipe 1. It is what becomes.

Reference numeral 10 denotes a communication pipe for connecting the primary chamber 3a and the secondary chamber 3b of the heat exchanger 3, and reference numeral 11 denotes a communication pipe 10 for the communication pipe.
Is a check valve provided in the middle of the check valve.
This serves as a backflow prevention means for preventing hot water from flowing back from the primary side chamber 3a of the heat exchanger 3 to the secondary side chamber 3b. Here, the check valve 11 is normally opened when the differential pressure between the primary side and the secondary side of the connection pipe becomes equal to or higher than the minimum operating differential pressure, but in the first embodiment, The check valve 11 is used in which the minimum operating differential pressure of the check valve 11 is larger than the head of the circulating pump 6 and the value of the check valve 11 can prevent an increase in pipe pressure within an appropriate range. The reason is that if the minimum operating differential pressure of the check valve 11 is lower than the head of the circulating pump 6, the check valve 11 is opened while the circulating pump 6 is operating. When the hot water in the hot water circulation branch pipe 4 flows into the hot water supply main pipe 1 and the outflow is supplied from the make-up water pipe 7 to the hot water circulation branch pipe 4, the hot water supplied by the hot water is supplied to the hot water meter (volume). This is because the water is measured by the water dispenser 8 and is measured more than the actual amount of hot water.

Next, a process of discharging the hot water expansion water into the hot water main pipe will be described below. Immediately after the hot water is discharged and inspected at the time of regular inspection, immediately after refilling the water, or in the case of absence for a long time, the power of the circulating pump 6 is turned off to go out, and immediately after the power is turned on again when returning home, The temperature of the hot water in the hot water circulation branch pipe 4 is lower than during normal use.
It is quite low.

In such a state, since the temperature of the hot water is lower than the lower limit temperature set by the control means (not shown), the control means activates the circulation pump 6 to supply hot water in the hot water circulation branch pipe line 4. Warm the water. The temperature change of the hot water in the hot water circulation branch pipe 4 at this time is considerably larger than the temperature change during normal use, and the volume change of the hot water in the hot water circulation branch pipe 4 is naturally large. Accordingly, the pressure in the hot water supply circulation branch pipe line 4 increases with time.

As the pressure in the hot water circulation branch pipe 4 increases, the pressure difference between the pressure in the hot water circulation branch pipe 4 and the pressure in the hot water main pipe 1 becomes the minimum operation of the check valve 11 of the communication pipe 10. When the pressure becomes equal to or higher than the differential pressure, the check valve 11 is opened, and the supply water for the expansion (excess supply water) is discharged from the secondary chamber 3b of the heat exchanger 3 to the primary chamber 3a.

When the temperature of the hot water reaches the upper limit set temperature (approximately the same as the hot water temperature of the main hot water supply line 1), the circulation pump 6 is automatically stopped by the output control signal from the control means. As a result, the volume of the hot water in the hot water circulation branch pipe line 4 does not expand any more. Therefore, when the differential pressure becomes equal to or less than the minimum set differential pressure of the check valve 11, the check valve 11
Closes.

Embodiment 2 FIG. FIG. 3 is a schematic configuration diagram showing an entire hot water supply system according to Embodiment 2 of the present invention.
1 and 2 are denoted by the same reference numerals, and redundant description is omitted. In the second embodiment,
The difference from the first embodiment is that the hot water supply main pipe 2 on the secondary side and the hot water supply circulation branch pipe 4 are communicated by the communication pipe 10, and the communication pipe 10 is provided with the check valve 11. . In the second embodiment, the check valve 11 provided in the communication pipe 10 is used.
The minimum operating differential pressure is calculated in the same manner as in the first embodiment, and the process of discharging hot water supply expansion water is the same as in the first embodiment.

According to the second embodiment, when the hot water supply system of the prior application (Japanese Patent Application Laid-Open No. 3-291428) is already used, when the hot water supply system according to the second embodiment is improved, It is only necessary to update a part of the piping and to install a check valve without replacing 3, which is a great cost advantage. In the second embodiment, the hot water supply circulation branch pipe 4 communicates with the secondary hot water supply main pipe 2 through the communication pipe 10, but the same effect can be obtained even if the hot water circulation branch pipe 4 is connected with the primary hot water supply main pipe 1. can get.

Embodiment 3 FIG. FIG. 4 is a schematic configuration diagram showing the entire hot water supply system according to Embodiment 3 of the present invention.
The same or corresponding parts as in FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted. In FIG. 4, reference numeral 12 denotes a pressure relief valve provided in the hot water supply circulation branch pipe line 4. That is, in the first embodiment and the second embodiment, the surplus hot water generated in the hot water circulation branch pipe 4 is returned to the hot water main pipe 1 or 2, but in the third embodiment, the surplus hot water is returned. The hot water is discharged to the discharge pipe without returning to the hot water supply main line 1 or 2. In the third embodiment,
When the pipe pressure in the hot water circulation branch pipe line 4 becomes equal to or higher than the set operating pressure of the pressure relief valve 12, the pressure relief valve 12 opens to discharge the excess hot water to a drain hopper (not shown). is there.

In the first and second embodiments, the minimum operating pressure of the check valve 11 is calculated. However, it is necessary to consider the performance of equipment and the wear loss of pipes and the like in the calculation. In the third embodiment, the maximum internal pressure at which the connected devices and the pipes function safely can be directly replaced with the set operating pressure of the pressure relief valve 12, and the calculation is simple. Also, it is very effective in the case where a drain hopper is already present in the vicinity or in a place where it can be easily installed.

[0026]

As described above, according to the present invention, an abnormal increase in pipe pressure can be prevented, and a circulating pump, a branch pipe line, a hot water tap, etc. caused by an abnormal increase in pipe pressure can be prevented.
Further, there is an effect that damage due to water leakage or the like due to the damage can be prevented. Further, there is an effect that abnormal discharge of hot water can be prevented, and a hot water supply system free from danger of occupants being burned can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a hot water supply system according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view showing the heat exchanger in FIG.

FIG. 3 is a schematic configuration diagram showing a hot water supply system according to Embodiment 2 of the present invention.

FIG. 4 is a schematic configuration diagram showing a hot water supply system according to Embodiment 3 of the present invention.

[Explanation of symbols]

 1, 2 hot water supply main line 3 heat exchanger (heat exchange means) 3a primary side room 3b secondary side room 4 hot water supply circulation branch line 5a, 5b hot water tap (hot water supply use means) 6 circulation pump (hot water supply water circulation means) 7 makeup water pipe 8 Water meter (measuring means for hot water supply) 9 Check valve (check means) 10 Communication pipe 11 Check valve (check means) 12 Pressure relief valve

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takemi Muranaka Room 1-472, Kita-Kojiya 1-chome, Ota-ku, Tokyo Room (72) Inventor Masato Komiya 1-18-8 Hayabuchi, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Katsuta A201 F term (reference) 3L073 AA12 AB02 AC07 AC09 AC10

Claims (4)

[Claims] 1. A hot water supply main pipe for supplying hot water, a hot water circulation branch pipe for supplying hot water to hot water use means, and a branch from the hot water supply main pipe and connected to the hot water circulation branch pipe. A supply water pipe for supplying water, a heat exchange means comprising a primary chamber connected to the hot water supply main pipe and a secondary chamber connected to the hot water circulation branch pipe, and installed in the hot water circulation branch pipe. Hot water circulation means, hot water metering means installed in the supply water pipe, and excess hot water discharge means for discharging excess hot water from the hot water circulation branch pipe line and / or the heat exchange means. Hot water supply system. 2. The surplus hot water discharge means comprises a communication pipe communicating the primary chamber and the secondary chamber of the heat exchange means, and a backflow prevention means installed in the communication pipe. Hot water system. 3. The surplus hot water discharge means comprises a communication pipe communicating the hot water main pipe and the hot water circulation branch pipe, and a backflow prevention means installed in the communication pipe.
Hot water supply system as described. 4. The hot water supply system according to claim 1, wherein the excess hot water discharge means comprises a pressure relief valve installed in the hot water circulation branch pipe.