JPS592821B2 - Hot water boiler control device - Google Patents

Description

[Detailed Description of the Invention] The present invention circulates a hot water boiler and a hot water storage tank, appropriately controls the hot water and water supply, prevents condensation inside the boiler, and improves combustion efficiency and ultimately boiler efficiency. This invention relates to a hot water boiler control device.

Conventionally, there have been hot water boilers connected to hot water storage tanks.

However, because the temperature of the water that enters the hot water boiler and boiler is low (normal water temperature), a large amount of dew condensation occurs in the combustion chamber equipped with water pipes immediately after the hot water boiler is started, and this impedes combustion. However, the combustion efficiency and boiler efficiency are significantly lowered, and the condensation causes early corrosion of the combustion chamber.

Therefore, the present invention provides a feed pipe between the hot water boiler's hot water supply port and the hot water storage tank, a return pipe between the hot water boiler's water supply port and the hot water storage tank, and a circulation pump in the middle of the return pipe. The end of the water supply pipe from the water source is connected to the return pipe between the circulation pump and the hot water storage tank, one end of the bypass pipe is connected to the return pipe between the circulation pump and the hot water boiler, and the other end is connected to the hot water storage tank. The electric valve installed in the middle of the bypass pipe opens only when the temperature of the heat-sensitive tube installed in the tank drops below a specified temperature, and the electric valve installed in the middle of the water supply pipe opens when the hot water level in the hot water storage tank drops. By opening the floatless switch installed there, when the hot water boiler is operated, when there is little hot water in the hot water storage tank, that hot water and water from the water source are mixed and the hot water boiler is opened. It is possible to prevent dew condensation in the combustion chamber of the hot water boiler and increase combustion efficiency and boiler efficiency.In addition, if the hot water supply from the boiler is low at that time, the water flows back to the bypass from before the water supply port. This eliminates the above-mentioned drawbacks by reducing the amount of water that enters the boiler and increasing boiler efficiency, and furthermore, when the temperature of the water in the hot water storage tank drops, it is reheated.

Its structure will be explained with reference to the drawings.

1 is a once-through type hot water boiler, the specific configuration of which will be described later.

2 is a hot water storage tank in which hot water heated by the hot water boiler 1 is stored.

3 is a feed pipe, 4 is a return pipe, and the feed pipe 3
is provided to communicate between the hot water supply port a of the hot water boiler 1 and the hot water storage tank 2, and the return pipe 4 is connected to the water supply port a of the hot water boiler 1.
and the hot water storage tank 2 so as to communicate with each other.

P circulation pump, provided in the middle of the return pipe 4,
The power is caused to flow from the hot water storage tank 2 side to the hot water boiler 1 side.

Reference numeral 5 denotes a water supply pipe, one end of which is connected to a water source 6 with a discharge pressure such as tap water, an electromagnetic type or motor type electric valve v1 is provided in the middle, and the other end is connected to a hot water storage tank 2 and a circulation pump. It is connected to a return pipe 4 at an intermediate position between P and P.

FS is a floatless switch, which is installed in the hot water storage tank 2, and operates when the hot water level drops to a predetermined height, opening the series-connected motorized valve V1. is configured to release the operation and close the electric valve v1.

7 is a bypass pipe, one end of which is connected to the return pipe 4 between the circulation pump P and the hot water boiler 1, an electric valve V2 is provided in the middle, and the other end of the bypass pipe 5 is connected to the hot water storage tank. Connected to 2.

Reference numeral 8 denotes a heat-sensitive tube, which is a thermoswitch provided in the hot water storage tank 2, which closes when the temperature of the hot water reaches the lower limit set temperature and opens at the upper limit set temperature.

A burner 9 is provided on the side of the hot water boiler 1 and is linked to the heat-sensitive tube 8, so that the burner 9 is ignited and the hot water boiler 1 is operated only when the heat-sensitive tube 8 is closed.

The closed circulation pump P is also wired so as to be interlocked with the heat-sensitive tube 8, and is operated only when the heat-sensitive tube 8 is closed.

Reference numeral 10 denotes a heat-sensitive part, which is provided in the middle of the feed pipe 3, and is activated only when the temperature of the water in the pipe is below a predetermined temperature.
The motor-operated valve V2 is configured to close and operate, and the motor-operated valve V2 linked thereto opens.

A timer 11 is provided in the wiring between the circulation pump P and the heat-sensitive tube 8, and is used to keep the circulation pump P in operation for a certain period of time after the burner 9 has stopped.

Reference numeral 12 denotes an alarm device which sounds an alarm and stops the burner 9 when the circulation pump P fails.

This once-through type hot water boiler 1 has an outer cylinder 13 having a double wall.
An annular tank 14 communicating with this is provided on the front side (left side in FIG. 2), and a circular tank 15 is provided on the rear side (right side in FIG. 2) with a double wall sealed and closing the rear end. ,
Inside the outer cylinder 13, a cylindrical combustion chamber 18 in which water pipes 16 and fins 17 are alternately connected is provided with a gap, and the front and rear ends of the water pipe 16 are located near the center of the annular tank 14. , are connected to the sides of the circular tank 15, respectively,
A notch exhaust port 19 of an appropriate size is formed on the upper side of the fin 17 on the annular tank 14 side, and the outer cylinder 13 has a notch exhaust port 19 formed in the upper side of the annular tank 14 side.
The gap between 8 and 8 is a flue 20, and a partition plate 21 is provided to block half of the middle of the flue 20.
A chimney 22 is provided that penetrates the rear upper side of the outer cylinder 13.
A water supply port a is provided at the lower rear, and a hot water supply port is provided above the circular tank 15.

Further, the hot water in the hot water storage tank 2 is configured to be drained into a bathtub or the like only when the hot water reaches a predetermined temperature.

Next, the effects will be explained.

First, when the hot water storage tank 2 is full of hot water at a predetermined temperature (usable hot water), when that hot water is used and the hot water level drops by a certain height, the floatless switch FS closes and its operation , electric-yfv, is opened.

Then, water from the water source 6 flows into the hot water storage tank 2 via the water supply pipe 5 and the return pipe 4.

When the water increases in the hot water storage tank 2 and the temperature inside the hot water storage tank 2 falls and reaches the lower limit set temperature of the heat sensitive tube 8, the heat sensitive tube 8 closes and operates, igniting the burner 9,
The circulation pump P is operated and the hot water boiler 1 is started.

At this time, the hot water storage tank 2 is often not full, and the circulation pump P mixes the water from the water source 6 with the hot water in the hot water storage tank 2 (this hot water has a slightly lower temperature). ing.

) (which has a temperature higher than the water temperature) flows into the water supply port a of the hot water boiler 1, causes reverse combustion in the combustion chamber 18 by combustion in the burner 9, and further burns in the flue 20. The water pipe 16 is heated by the exhaust gas from the hot water supply port and flows into the hot water storage tank 2 via the feed pipe 3 from the hot water supply port.

At this time, if the temperature of the hot water supplied from the hot water boiler 1 falls below a predetermined temperature [if the combustion efficiency of the hot water boiler 1 and eventually the boiler efficiency is reduced], the tube heating section 10 provided in the feed pipe 3 is activated. Then, the electric-yfv2 is opened, and the mixture of hot water and water from the return pipe 4 is passed through the bypass pipe 7.
The hot water in the hot water storage tank 2 is increased to a predetermined temperature by branching the hot water further, reducing the amount flowing into the hot water boiler 1, reducing the amount heated by the hot water boiler 1, and increasing the temperature at which hot water is supplied from there.

Bypass pipe 7 reduces the amount of water supplied to hot water boiler 1 to increase boiler efficiency.

When the temperature of the feed pipe 3 rises to a predetermined temperature, the operation of the heat sensitive part 10 is canceled and the electric valve V2 is closed.

When hot water from the hot water boiler 1 flows into the hot water storage tank 2 in this way, the floatless switch FS is opened.
The electrically operated valve V By the operation of , the burner 9 is stopped and the timer 11 is started.
After a predetermined time (approximately 15 to 20 minutes), the circulation pump P
stops.

In addition, when the hot water in the hot water storage tank 2 is full and the temperature drops and reaches the lower limit set temperature of the heat-sensitive tube 8, the burner 9 is ignited and the circulation pump P is operated as described above, and the hot water boiler is activated. Reheating according to No. 1 is performed.

In addition, if there is no hot water in the hot water storage tank 2 (when this device starts operating), when the power is turned on, there is no hot water in the hot water storage tank 2, so the floatless switch (FS) is activated and the power is turned on. Open valve V1, and water from water source 6 flows into hot water tank 2.
flow inside.

Then, the burner 9 is ignited by the water reservoir and the heat-sensitive tube 8 which operates below the lower limit set temperature, and the circulation pump P is activated.

Then, the hot water boiler 1 starts operating.

At this time, the supplied water is just water, so even if it is heated by the hot water boiler 1, the temperature of the hot water coming out of the hot water supply port is low (the temperature of the hot water is low (the heat sensitive part 10 operates at a temperature below a predetermined temperature).
is opened, and water supplied from the circulation pump P flows to the hot water boiler 1 and flows to the hot water storage tank 2 from the bypass pipe 7.

While the hot water is being stored in the hot water storage tank 2 in this way, the hot water is then flowed into the hot water boiler 1 along with the water supplied from the water source 6 through the return piping 4 by the circulation pump P. These steps are repeated until the hot water in the sending piping 3 reaches a predetermined temperature. The heat sensitive part 10 operates to close the electric valve V2, and when the hot water storage tank 2 is full, the floatless switch (FS) operates to close the electric valve v0, and the hot water in the hot water storage tank 2 reaches the upper limit set temperature. In the event that
The burner 9 circulation pump P is stopped by the heat sensitive tube 8.

In the present invention, one end of the bypass pipe 7 is connected to the return pipe 4 between the circulation pump P and the hot water boiler 1, and the other end is connected to the hot water storage tank 2. By configuring the electric valve V2 installed in the middle of the bypass pipe 7 to open only when the temperature drops below V, the capacity of the hot water boiler 1 remains constant when the temperature at the heat sensitive part 10 falls below a predetermined temperature. If so, the temperature of the water supplied to the hot water boiler 1 is low\, and a portion of the water supplied in the return pipe 4 where the temperature is low can be branched from the bypass pipe 7 to reduce the amount of water supplied to the hot water boiler 1. .

Therefore, since the amount of water supplied to the hot water boiler 1 is small, it is possible to increase the amount of heat heated by the hot water boiler 1 per unit flow rate.

Therefore, even when the temperature of the water supplied to the hot water boiler 1 is low at the time of starting the boiler operation, relatively high temperature hot water can be supplied by the hot water boiler 1, and the boiler efficiency can be increased.

In addition, conventionally, the water that flows into the hot water boiler is low-temperature water such as tap water, so the temperature difference between the combustion gas and the water in the water pipes in the combustion chamber, which is made up of many water pipes, is caused by the temperature difference between the combustion gas and the water in the water pipes. Although there were disadvantages such as a large amount of condensation, which caused corrosion of water pipes, and incomplete burner combustion due to condensation, the combustion efficiency and eventually the boiler efficiency were significantly reduced. In the present invention, the end of the water supply pipe from the water source was connected to the return pipe 4 between the circulation pump P and the hot water storage tank 2, so that the water supplied to the hot water boiler 1 was made up of the water from the water source 6 and the hot water in the hot water storage tank 2. mixed with
Alternatively, only the hot water in the hot water storage tank 2 (when the electric-yvl installed in the water supply pipe 5 is closed, the hot water is below the lower limit set temperature in the hot water storage tank 2), and the temperature is lower than that of water only supplied from the water source 6. Even immediately after the hot water boiler 1 is started, the combustion chamber 18 made up of the water pipes 16 in the hot water boiler 1
In this case, the temperature difference between the combustion gas and the feed water is smaller than before, which reduces the occurrence of dew condensation and improves the combustion chamber 18.
Corrosion can be prevented and the product can withstand long-term use, and since little dew condensation occurs, the combustion efficiency in the combustion chamber 18 can be increased, and the boiler efficiency can also be increased.

In addition, only when the heat-sensitive tube 8 installed in the hot water storage tank 2 falls below a predetermined temperature, the burner 9 is ignited and the hot water boiler 1 and the circulation pump P are operated. Even if the temperature drops, the hot water is recirculated,
Hot water at a constant temperature can always be stored in the hot water storage tank 2 by reheating.

Furthermore, when the hot water level in the hot water storage tank 2 drops, the electric valve V1 installed in the middle of the water supply pipe 5 is opened by the operation of the floatless switch (FS) installed there. When the internal force level decreases, the water supplied from the water source 6 directly flows into the hot water storage tank 2, and when the temperature inside the hot water storage tank 2 decreases, the hot water boiler 1 and the circulation pump P are activated by the operation of the heat sensitive tube 8. is operated, then the water from the water source 6 and the hot water in the hot water storage tank 2 are mixed and heated in the hot water boiler 1 as described above, and this flows into the hot water storage tank 2, so that it can always be stored in a full state.

As described above, the floatless switch (FS) heat-sensitive tube 8 and heat-sensitive section 10 are capable of storing a certain amount of hot water at a certain temperature in the hot water tank while preventing condensation inside the hot water boiler 1 and increasing boiler efficiency. This is made possible by a circulation circuit that mixes water and hot water, reduces the amount of water supplied as appropriate, and causes the water to flow into the hot water boiler 1 by all or part of these operations.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which FIG. 1 is a schematic circuit diagram of the present invention, FIG. 2 is a longitudinal sectional view of a hot water boiler, and FIG. 3 is a longitudinal sectional view of a hot water boiler. It is a partial perspective view. 1... Hot water boiler, 2... Hot water storage tank, 3... Feed piping, 4... Return piping, 5... Water supply piping, 6...
・Water source, 7... Bypass pipe, 8... Heat sensitive tube, 9...
・Burner, 10... Heat sensitive part, P... Circulation pump, V
,,V2-...Electric valve, FS...Floatless switch.

Claims (1)

[Claims] 1 A feed pipe 3 is provided between the hot water supply port of the hot water boiler 1 and the hot water storage tank 2, and a return pipe 4 is provided between the water supply port of the hot water boiler 1 and the hot water storage tank 2, and a circulation pump is installed in the middle of the return pipe 4. A 5 end of the water supply pipe from the water source 6 is connected to the return pipe 4 between the circulation pump P and the hot water storage tack 2, and one end of the bypass pipe 7 is connected to the return pipe 4 between the circulation pump P and the hot water boiler 1. The other end is connected to the hot water storage tank 2, and the burner 9 is ignited to operate the hot water boiler 1 and the circulation pump P only when the heat-sensitive tube 8 provided in the hot water storage tank 2 falls below a predetermined temperature. The motorized valve V2 provided in the middle of the bypass pipe 7 is opened only when the heat-sensitive part 10 provided in the middle of the feed pipe 3 falls below a predetermined temperature 9, and the motorized valve V2 provided in the middle of the water supply pipe 5 is opened. v1 is a floatless switch F installed there when the hot water level in the hot water storage tank 2 drops.
A hot water boiler control device characterized in that it is opened by the operation of S.