JPS61295460A - Hot water supplier - Google Patents

Abstract

PURPOSE:To prevent water from heating due to after-heating in a heater and to recover warm water in a circulation circuit without waste by providing a controller for stopping a circulation pump in a delay of a set time from the operation stop of the heater. CONSTITUTION:A pump control device 29 compares the detected temperature To of a temperature sensor 18 with a set temperature Ts, and the pump flow amount is adjusted so that To draws to Ts. When the detected temperature Ti of a temperature sensor 19 becomes more than the set temperature Ts, a warm water thermostat 27 turns off output switches 271 and 272. Upon this occasion, the power supply of a burner controller 32 is cut off, and the burner 11 stops to burn. Also, after the lapse of 45 seconds from the time point where the burner 11 stops to operate, a delay off time device 28 turns off a timer switch 281 to cut off the power supply of the pump controller 29. For this reason, after the stoppage of the burner 11, the operation of a circulation pump 7 is continued, and hence heating within the heating unit 10 due to after-heating can be prevented.

Description

[Detailed description of the invention] (a) Industrial application field This invention supplies water supplied to a hot water storage tank to a heating device installed outside the hot water storage tank, and returns the hot water heated here to the hot water storage tank. The present invention relates to a water heater that stores hot water in a temperature stratified state and uses it for hot water supply.

(B) Prior Art As disclosed in Japanese Patent Application Laid-Open No. 58-117948, a conventional water heater of this type has a circulating pump and a Activate the heating device.

When the temperature detected by the temperature sensor exceeds a certain temperature, the circulation pump and heating device are stopped. For this reason, due to the radial phenomenon after stopping the operation of the heating device,
Boiling may occur within the heating device.

There was a problem that hot water was left in the circulation circuit and wasteful heat was dissipated.

(c) Problems to be Solved by the Invention The problem to be solved by the invention is to prevent boiling due to the diameter line in the heating device and to recover the hot water in the circulation circuit without wasting it.

B) Means for Solving the Problems In order to solve the above problems, the water heater of the present invention includes a hot water storage tank with a water supply pipe connected to the lower part and a hot water supply pipe connected to the upper part, and a hot water storage tank provided outside the water storage tank. With heating device.

A system equipped with a circulation pump and a circulation circuit that supplies water from the lower part of the hot water tank to the heating device and returns hot water heated by the heating device to the top of the hot water storage tank, when the heating device stops operating. This configuration includes a control device that stops the circulation pump after a set time delay.

(E) Effect With the above configuration, the circulation pump continues to operate even after the heating device stops operating, and water flows into the heating device, so there is no fear of boiling occurring within the heating device. Also.

The hot water in the circulation circuit on the heat exchanger outlet side and the hot water in the radial line are collected into the hot water storage tank without waste.

(f) Example Hereinafter, embodiments of the present invention shown in the drawings will be described.

FIG. 1 shows an example of a water heater to which the present invention is applied. In Figure 1, (1) is the water supply pipe (2) at the bottom.
, a hot water storage tank with a hot water supply pipe (3) connected to the top thereof, (4
) is a circulation circuit that connects the water outlet (5) at the bottom of the hot water storage tank and the hot water return port (6) at the top of the hot water storage tank, and the circulation circuit (4)
A circulation pump (7), a check valve (8), a flow switch (9), and a heating device (g) are installed in this order. (
b) is the burner that is the heat source of the heating device αO, @ is the burner α
The fuel supply pipe to D is the fuel valve installed in the fuel supply pipe (2), α4 is the exhaust fan, Q5 is the exhaust pipe, and 00 is installed in the circulation circuit (4) on the exit side of the head of the heating device. αη is the air vent pipe that connects the gas-liquid separation unit (to) and the hot water supply pipe (3), and (to) is the hot water temperature To at the outlet of the heating device αO.
α9 is the temperature sensor that detects the water temperature at the bottom of the hot water tank (1), the handle is the operation switch, (c) is the temperature setting device, and the handle is the circulation circuit immediately downstream of the circulation pump (7) (4) is the anti-freeze thermometer installed in the circulation circuit (4) near the inlet of the heating device; (c) is the anti-freeze thermometer installed in the circulation circuit (4) near the inlet of the heating device;
6) and the exhaust fan α→, which also functions as an antifreeze device. In addition, the circulation circuit (4) is wrapped with heat insulating material except for the parts where the heating device 00 and the antifreeze thermometer are attached, so that the antifreeze thermometer responds quickly to changes in the ambient temperature. be.

FIG. 2 shows a specific circuit example of the control device (c). In Fig. 2, the chandelier is the busbar connected to the power supply, and the ink is the operation switch or the anti-freeze motor, which is activated when either one is on, and the temperature Ti detected by the temperature sensor a0 and the temperature setting device Q1) and the desired set temperature T's.
Output switch (271) (
When either the output switch (271) or the anti-freezing thermometer (c) is on, the timer switch (281) is turned on, and the output switch (271) and the anti-freezing thermometer are turned on. A delay-off timer device that turns off the timer switch (281) after a set time (45 seconds as an example) from the time when all of the thermos are turned off. , a pump control device that compares the detected temperature To of the degree sensor (To) and the set temperature of the temperature setting device Q1) and operates the circulation pump (7) while adjusting the pump flow rate in a direction in which To approaches Ts; (1) is a flow switch (9
) and a delay-on timer device that turns on the trailing timer switch (301) for a set time (10 seconds as an example) from the moment it is energized through the output switch (272), 0
1) is a relay for driving exhaust fan α4 connected in parallel to the delay-on timer device (1), and (2) is energized via the flow switch (9), output switch (272), and timer switch (301). This is a burner control device that opens the fuel valve U and operates the burner (2).

In addition, the antifreeze thermometer (c) turns on when the detected temperature falls below the freezing dangerous temperature (for example, 2℃), and turns off when it detects a temperature of 6℃ or higher.When you turn on the operation switch, the hot water thermometer ( wealth)
compares the detected temperature Ti of the temperature sensor u with the set temperature Ts of the temperature setting device Q1). At this time, if Ti is lower than Ts, output inch (271) (272)
is turned on. Further, when the output switch (271) is turned on, the delay off timer device (c) turns on the timer switch (281). For this reason, the pump control device 翰 operates the circulation pump (7) and compares the detected temperature To of the 1m degree sensor (g) with the set temperature Ts,
Adjust the pump flow rate so that To approaches Ts.

When the circulation pump (7) operates, the flow switch (9)
detects running water in the circulation circuit (4) and turns on. Also,
Since the output switch (272) is already on.

The delay-on timer device (1) and relay C31) are energized. At this time, the exhaust fan α Kiku is operated and so-called blip purge starts. After that, when the set time (10 seconds) of the delay-on timer device (1) has elapsed and the timer switch (301) is turned on, the burner control device (2)
opens the fuel valve (to) and causes the burner (b) to perform combustion.

When the burner (6) starts combustion, the water that enters the circulation circuit (4) from the water outlet (5) of the hot water storage tank (1) receives the combustion heat of the burner (6) in the heating device. ) The water becomes warm as it passes through it. The hot water from the heating device passes through the circulation circuit (4) and enters the hot water storage tank (1) from the hot water return port (6).

In addition, the pump control device 翰 compares the detected temperature To of the temperature sensor (7) with the set temperature Ts, and adjusts the 5IC pump flow rate until To approaches Ts, so that the water temperature on the inlet side of the heating device (T) increases. When it is low, the pump flow rate is small and the water temperature on the inlet side of the heating device αO is high.

Pump flow rate increases. Therefore, hot water maintained at approximately the set temperature is stored in the hot water tank (1) in order from the top.

As a result, the detected temperature Ti of the temperature sensor α1 becomes the set temperature T
When the temperature exceeds s, the hot water thermometer (c) turns off the output switches (271) and (272). At this time, the burner control device (a) is de-energized and the burner (6) stops combustion. Further, the delay off timer device (c) is activated when 45 seconds have elapsed from the time when the burner Ql) was stopped.

Turn off the timer switch (281) and turn off the power to the pump control device. For this reason, after the cessation of Burna α sword.

The operation of the circulation pump (7) is continued for 45 seconds, and the meridian prevents boiling in the heating device aO. In addition, the set time (45 seconds) of the delay off timer device (c) is such that when the circulation pump (7) operates at the minimum flow rate, water at the water outlet (5) passes through the circulation circuit (4) to the hot water return port (45 seconds). 6)
Since the time required to reach K is set, all of the hot water in the circulation circuit (4) can be collected into the hot water tank (1).

In this way, the hot water stored in the hot water tank (1)K is sent from the hot water supply pipe (3) to the usage section at any time. Moreover, when hot water is dispensed, water is supplied from the water supply pipe (2) to the hot water storage tank (1) accordingly. Then, when the temperature Ti detected by the temperature sensor α becomes lower than the set temperature Ts by a certain temperature or more, the hot water thermo circuit again closes the output switches (271) and (272), and the above-described operation is repeated.

When the outside temperature is low, such as at night in winter, the circulation circuit (4)
water may freeze. Therefore, the control device (c) causes the following antifreeze operation to be performed even if the operation switch (1) is turned off.

That is, when the anti-freezing thermometer or window detects a low temperature of 2° C. or lower and turns on, the delay off timer device is energized and the time switch (281) is turned on. Then, the pump control circuit is energized and starts the circulation pump (7), so that the water or hot water in the lower part of the hot water tank (1) flows into the circulation circuit (4) from the water outlet (5).

At this time, if the water temperature at the bottom of the hot water tank (1) is 6℃ or higher, the anti-freezing thermometer (a) or the handle will move to the hot water tank (1).
Water or hot water can be turned off by flowing into these fittings. Therefore, even if the delay-on timer device (1) is energized via the flow switch (9) and the output switch (272), the delay-on timer device (1)
The hot water thermometer stops operating before the set time (10 seconds) elapses, and the output switch (271) (272
) is turned off, so that no combustion takes place in the burner (6) of the heating device αO. And circulation pump (7)
is the delay off timer device setting time (45 seconds) from the time when the antifreeze thermostat (A) or (C) turns off.
Stop after the elapsed time. Therefore, even if the circulation pump (7) operates at a minimum flow rate.

The water or warm water at the bottom of the hot water storage tank (1) is distributed throughout the circulation circuit (4), thereby preventing the entire circulation circuit (4) from freezing.

In the unlikely event that the water temperature at the bottom of the hot water storage tank (1) is lower than 6°C, the antifreeze thermometer will not turn off even if the water at the bottom of the hot water storage tank (1) is supplied to the circulation circuit (4).

In this case, as a matter of course, the output switches (271) and (272) of the hot water thermometer are turned on, so the delay-on timer device and relay 01) turn on the flow switch (9) and the output switch (272). The pre-purge is carried out by applying electricity through the inverter. Then, when the set time of the delay-on timer device (1) has elapsed, the burner control device (a) is energized and the burner αD starts combustion. As a result, the water in the hot water tank (1) is heated and the circulation circuit (
4) When the temperature of the water flowing through the pipe reaches 6°C or higher, all anti-freezing thermometers (c) are turned off. At this time, the hot water thermostat stops operating, so the burner 01) stops burning. The circulation pump (7) then stops operating when the set time of the delay off timer device (to) has elapsed after the burner (6) has stopped. Therefore, if the water temperature in the lower part of the hot water storage tank (1) is low and the water in the hot water storage tank (1) is not useful for preventing freezing, burner αD is used to perform combustion, and the circulation circuit (
4) Freezing of water can be reliably prevented. Of course, after the burner (11) has stopped burning.

Since the circulation pump (7) stops after a delay of the set time of the delay-off timer device (c), there is no fear of boiling occurring in the heating device αO.

According to this embodiment, when the operation of the burner (6) of the heating device αO is stopped, not only during normal operation using the operation switch (1), but also during anti-freezing operation using the anti-freeze thermostat (a) @. Since the circulation pump (7) is made to stop after a delay of the time set by the delay off timer device □□□, the radial line prevents boiling in the heating device αO, and the hot water in the circulation circuit (4) It is economical because all of the water can be collected into the hot water storage tank (1).

(G) Effects of the Invention Since the present invention is configured as described above, the circulation pump can be stopped after a set time delay after the heating device stops operating, thereby eliminating boiling in the heating device due to the radial line. At the same time, hot water from the circulation circuit can be recovered to the hot water tank without wasting it.

Safety and economic efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an example of a water heater to which the present invention is applied, and FIG. 2 is an electric circuit diagram of the control device shown in FIG. 1. (1)... Hot water tank, (2)... Water supply pipe, (3)...
・Hot water pipe, (4)...Circulation circuit, (7)...Circulation pump, α(G)...Heating device, (C)...Control device. Figure 1

Claims (2)

[Claims] (1) It has a hot water storage tank with a water supply pipe connected to the bottom and a hot water supply pipe connected to the top, a heating device installed outside the tank, and a circulation pump, which supplies water from the bottom of the hot water storage tank to the heating device. In addition, in a water heater equipped with a circulation circuit that returns hot water heated by the heating device to the upper part of the hot water storage tank, the provision of a control device that stops the circulation pump after a set time delay after the heating device stops operating. Characteristic water heater. (2) The hot water supply device according to claim 1, wherein the set time is set to be longer than the time required for hot water from the heating device to reach the hot water storage tank.