JPH0227577B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of a passageway on the heat source side in a hot water storage type water heater in which a heating heat source is provided outside the hot water storage tank.

1. Construction of a conventional example and its problems An example of a conventional storage type water heater of this type is shown in FIG. In normal heating operation, the heat exchanger section 2 is heated from the hot water storage tank 1.
Water is supplied through natural circulation or by a pump 3, heated by a burner 4, and then returned to the hot water storage tank 1. In addition, as for other water passages, there is a hydrant 5 on the water supply side of the hot water storage tank 1 to stop the water supply, and a safety valve 6 on the hot water supply side that can be inserted into the piping, which is used for maintenance and to prevent freezing in winter. A drain plug 7 for draining water was provided.

In the above configuration, when water is drained in case of failure or inspection of the heating side passageway of the heat exchanger 2 or the pump 3, the water supply valve 5 is closed, the safety valve 6 is opened, and the drain valve 7 is opened. In this case, there were the following two drawbacks.
First, in order to drain a large amount of hot water from the hot water storage tank, a large amount of time is required for draining the water and refilling the tank with water. Secondly, all the heated hot water in the hot water storage tank is discarded, which results in a large amount of non-energy-saving waste every time the operation is performed.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to shorten operating time and save energy by preventing hot water from being discharged when removing and installing parts of a heating water passage section.

Composition of the Invention In order to achieve the above object, the hot water storage type water heater of the present invention includes a hot water storage tank having a water supply channel equipped with a water supply tap and a hot water supply channel equipped with a safety valve, and a heating system that heats water in the hot water storage tank. a water passage connected to the heat exchanger of the heating part and connected to the bottom and top of the hot water storage tank to guide hot water drawn out from the hot water storage tank and heated back to the hot water storage tank; and this water passage. Installed in the water channel on the side of the heating section, which is the inlet side of the heat exchanger,
A water stop valve that closes when water is drained; a water drain valve located downstream of the water stop valve and provided at the lowest part of the heating section side waterway; a water drain valve that drains water from the hot water storage tank; When the water passage connected to the top of the tank is connected to a place other than the top of the hot water storage tank, it is provided in the water passage and consists of a water stop valve and an air intake port that are closed when water is drained. Close the drain valve and open the drain valve to drain water from only the heating section and water passage.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment,
Water is supplied and drained from the lower part of the hot water tank 1, and hot water is supplied from the upper part. Therefore, a water tap 5 is provided in front of the hot water tank 1 for water supply, a drain plug 7 for draining water, and a safety valve 6 for hot water supply. Further, a heating unit 8 such as a heat exchanger 2 heated by a burner 4 and a forced circulation pump 3 is configured to be separated from the hot water storage tank 1. Heating section 8
The water passage M exits from the lower part of the hot water storage tank 1 and returns to the top of the hot water storage tank 1, and a water stop valve 9 is provided near the outlet of the hot water storage tank 1, and the water flow path M exits from the bottom of the hot water storage tank 1 and returns to the top of the hot water storage tank 1. A drain plug 10 is provided.

When draining water from the heating section side waterway _M1 with the above configuration, first close the water supply valve 5 and the water stop valve 9, and then close the safety valve 6.
open it. Next, by opening the drain valve 10, water can be drained from the heating section 8 above the drain valve 10, independently of the hot water tank 1, reducing operation time and saving energy by not having to throw away warmed water. Effects can be obtained.

Second Embodiment When the return position of the heating section side waterway _M1 to the hot water storage tank 1 is not at the top of the hot water storage tank 1, a configuration in which a water stop valve 9 and an air intake port (not shown) are provided at the inlet of the hot water storage tank 1 becomes.

Effects of the Invention As explained above, according to the hot water storage type water heater of the present invention, inspection and maintenance time can be greatly shortened, and a large amount of hot water that has been warmed up at the time does not need to be thrown away, resulting in both energy saving and Improvements can be made.

In addition, the water stop valve and water drain valve are installed directly in the water flow path that includes the heating part connected to the hot water storage tank to drain water, so it is easy to form a water drain circuit without having to install separate piping for water drainage. can.

Furthermore, water can be drained from the water passageway and the hot water tank separately, making it easier to use.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional example, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1...Hot water tank, 6...Safety valve (air intake),
9... Water stop valve, 10... Drain valve.

Claims (1)

[Claims] 1. A hot water storage tank that has a water supply channel equipped with a hydrant and a hot water supply channel equipped with a safety valve, a heating section that heats the water in this hot water storage tank, and a heating section that is connected to the heat exchanger of this heating section and that has a hot water supply channel equipped with a safety valve. A water passage connected to the lower and upper parts of the tank that guides heated hot water drawn from the hot water storage tank back to the hot water storage tank, and a water stop valve installed in the heating section side waterway that is the inlet side of the heat exchanger of this water passage. a water drain valve located downstream of the water stop valve and provided at the lowest part of the heating section side waterway; a water drain valve that drains water from the hot water storage tank; and a water drain valve that is connected to the top of the hot water storage tank. A hot water storage type water heater comprising a water stop valve and an air intake port, which are provided in the water passage when the water passage is connected to a location other than the top of the hot water storage tank and are closed when water is drained.