JP3702055B2 - Heat source machine for hot water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water heater that circulates and supplies heating water to a radiator, and more particularly to a heat source device of a hot water heater that can automatically supply tap water as heating water to a sealed heating circuit.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as shown in FIG. 2, a heat source unit 1 of a hot water heating apparatus that can automatically supply tap water as heating water to a sealed heating circuit has a casing 2, and hot water supply is provided in the casing 2. A hot water pipe 5 is connected to one end of the hot water supply pipe 3 via a water supply joint 4, and a faucet 6 is provided to the other end of the hot water supply pipe 3. A hot water supply heat exchanger 8 heated by the hot water supply burner 7 is provided (see, for example, JP-A-8-240321) .
[0003]
In addition, a sealed heating circuit 9 is provided in the casing 2, and the closed heating circuit 9 is connected to a forward header 10 and a return header 11 at both ends, respectively, and is connected to a normal water pressure (about 1.4 kgf). Expansion tank 13 provided with a pressure cap 12 that opens at a gauge pressure (for example, 0.9 kgf / cm 2) smaller than / cm 2), a circulation pump 14 that circulates heating water in the expansion tank 13, and for heating The heating heat exchanger 16 that is heated by the burner 15 and heats the heating water is sequentially connected by heating pipes 9A and 9B.
[0004]
The expansion tank 13 is provided with a lower limit water level detection electrode 17 for detecting the lower limit water level of the heating water in the expansion tank 13 and an upper limit water level detection electrode (not shown) for detecting the upper limit water level. Is provided with a reserve tank 18, which is in communication with the pressure cap 12 of the expansion tank 13 via a connecting pipe 19.
[0005]
A heating water supply pipe 20 for supplying tap water to the expansion tank 13 is connected between the hot water supply pipe 3 near the water supply joint 4 and the expansion tank 13. The heating water replenishment stop valve 21 that opens and closes at the same time, the heating water replenishment electromagnetic valve 22, and the air release valve 23 are provided in that order.
[0006]
24 and 24 are external radiators such as a fan convector connected between the forward header 10 and the return header 11, 25 is a bypass pipe provided between the heating pipes 9A and 9B, and 26 is a supply / exhaust air I am a fan.
[0007]
The heat source unit 1 of the above-described conventional hot water heating apparatus is in a state where the heating water supply stop valve 21 provided in the heating water supply pipe 20 is opened, and in that state, When the heating water decreases and the water level in the expansion tank 13 decreases, the lower water level detection electrode 17 detects the lowering of the water level, and the heating water supply electromagnetic valve 22 opens based on the detection signal. By opening the heating water supply electromagnetic valve 22, tap water supplied from the water supply main 5 to the hot water supply pipe 3 through the water supply joint 4 is supplied to the heating water supply pipe 20, and the heating water supply stop valve 21, heating is performed. It is supplied as heating water into the expansion tank 13 through the water replenishing electromagnetic valve 22 and the air release valve 23. At this time, the pressure cap 12 of the expansion tank 16 opens at a gauge pressure (for example, 0.9 kgf / cm 2) smaller than the normal water pressure (about 1.4 kgf / cm 2). The tap water is poured into 13.
[0008]
[Problems to be solved by the invention]
By the way, in the thing of the conventional structure mentioned above, when a water supply pressure falls below the gauge pressure (for example, 0.9 kgf / cm <2>) of the pressure cap 12 for some reason, in the case where it is low, in the enclosed heating circuit 9 There was a problem that tap water could not be replenished automatically.
[0009]
The present invention has been made in view of the circumstances described above, even when the water pressure drops, automatic replenishment of tap water to the closed heating circuit, are intended to make it any performed without hindrance.
[0010]
[Means for Solving the Problems]
In the present invention, an expansion tank provided with a pressure cap, a water level detection electrode provided in the expansion tank for detecting a decrease in the level of the heating water in the expansion tank, and the heating water in the expansion tank are circulated to the radiator. A sealed heating circuit having a circulation pump and a heat exchanger for heating the heating water, and a heating water supply solenoid valve is opened based on a detection signal of the water level detection electrode, and tap water is automatically supplied to the sealed heating circuit. In the heat source unit of the hot water heating apparatus comprising heating water supply means for replenishing , the expansion tank has an electric on-off valve that is opened when the heating water replenishing solenoid valve is opened to open the expansion tank to the atmosphere It is the structure by which the opening / closing apparatus which has is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1, but the same components as those in the prior art of FIG. That is, at the upper part of the expansion tank 13, the heating water supply electromagnetic valve 22 provided in the heating water supply pipe 20 is opened and closed substantially simultaneously with the opening and closing operation of the heating water supply electromagnetic valve 22. An opening / closing device 27 is provided to open the air to the atmosphere. The opening / closing device 27 includes a ventilation pipe 27A and an electric opening / closing valve 27B such as an electromagnetic opening / closing valve provided in the ventilation pipe 27A.
[0012]
Since the heat source unit 1 of the hot water heating apparatus according to the present invention is configured as described above, tap water supplied from the main water supply pipe 5 to the hot water supply pipe 3 via the water supply joint 4 when hot water is supplied by the heat source apparatus 1. Is heated by the heat exchanger 8 for hot water supply, heated up, and supplied as hot water from the faucet 6.
[0013]
On the other hand, at the time of heating by the heat source device 1, the heating water in the expansion tank 13 flows through the heating pipe 9 </ b> A of the hermetic heating circuit 9 and is heated by the heating heat exchanger 16 by the rotation drive of the circulation pump 14. After the temperature rises, the heat is supplied to the radiators 24 and 24 via the forward header 10 and is radiated and heated here, and then returned to the expansion tank 13 via the return header 11 and the heating pipe 9B. .
[0014]
If the heating water in the expansion tank 13 becomes insufficient during heating by the heat source unit 1 described above, the water in the reserve tank 18 is replenished as heating water in the expansion tank 13 via the connection pipe 19. If it is insufficient, the lower limit water level detection electrode 17 detects a drop in the water level in the expansion tank 13, and the heating on / off valve 27B of the opening / closing device 27 is substantially simultaneously with the opening of the heating water supply electromagnetic valve 22 based on the detection signal. Opens. Then, the tap water supplied to the hot water supply pipe 3 from the water supply main pipe 5 through the water supply joint 4 by the valve opening operation of the heating water supply electromagnetic valve 22 is supplied to the heating water supply pipe 20, and heating water supply is stopped. It is supplied as heating water into the expansion tank 13 through the valve 21, the heating water supply electromagnetic valve 22, and the air release valve 23.
[0015]
Here, substantially simultaneously with the opening of the heating water supply electromagnetic valve 22, the electric on-off valve 27 </ b> B of the opening / closing device 27 is opened to open the inside of the expansion tank 13 to the atmosphere. Even when the water pressure is lower than the gauge pressure of the pressure cap 12 (for example, 0.9 kgf / cm 2) or originally low, tap water can be automatically supplied into the expansion tank 13. , water injection of tap water to the closed heating circuit 9, can be carried out without any problem.
[0016]
In the above-described embodiment, the water heater is integrally incorporated in the heat source unit 1. However, a heat source unit dedicated to hot water heating may be used. good.
[0017]
【The invention's effect】
As described above, according to the present invention, an expansion tank provided with a pressure cap, a water level detection electrode provided in the expansion tank for detecting a decrease in the level of heating water in the expansion tank, A hermetic heating circuit having a circulation pump for circulating the heating water to the radiator and a heat exchanger for heating the heating water, and a heating water replenishing electromagnetic valve based on a detection signal of the water level detection electrode, and the sealing in the heat source apparatus of the hot water heating system comprising a heating water replenishing means for automatically replenishing tap water wherein the heating circuit, wherein the expansion tank, the expansion tank is opened during the opening of the heating water supply solenoid valve Since the switchgear has an electric open / close valve that opens the air to the atmosphere, even if the water pressure is lower than usual or even when the water pressure drops, there is no need to bother human hands. , dense It can perform automatic replenishment of tap water to Formula heating circuit reliably, thereby improving convenience.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a heat source unit of a hot water heating apparatus according to the present invention.
FIG. 2 is a configuration diagram of a heat source device of a hot water heating apparatus showing a conventional example.
[Explanation of symbols]
1 Heat source machine 9 Sealed heating circuit 12 Pressure cap 13 Expansion tank 14 Circulation pump 16 Heat exchanger for heating (heat exchanger)
20 Heating water supply pipe (heating water supply means)
22 Heating water supply solenoid valve (heating water supply means)
24 radiator 27 switchgear
27B electric on-off valve

Claims (1)

An expansion tank provided with a pressure cap, a water level detection electrode provided in the expansion tank for detecting a decrease in the level of heating water in the expansion tank, a circulation pump for circulating the heating water in the expansion tank to a radiator, and A sealed heating circuit having a heat exchanger for heating the heating water, and a heating water replenishing solenoid valve based on a detection signal of the water level detection electrode, and automatically supplying tap water to the sealed heating circuit In the heat source machine of the hot water heating apparatus provided with the replenishment means ,
The expansion tank is provided with an open / close device having an electric open / close valve that is opened when the heating water replenishing solenoid valve is opened to open the expansion tank to the atmosphere. Heat source machine for heating system.

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