JPS5833481Y2 - Front-stop instant water heater - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a first stop type instantaneous water heater.

Conventionally, it has been necessary to drain water from the waterway to prevent after-boiling or freezing when using an instantaneous water heater, and this is especially true for single-can, two-circuit water heaters that incorporate a stop-start instantaneous water heater in the bathtub. In the circulating water supply type bath pot, it is essential to drain water from the water channel when heating the bath pot.

Drainage was accomplished by closing the water stop valve, then opening the hot water tap and drain valve.

In order to make the water heater usable again after draining water, it is necessary to close the drain valve and hot water supply valve, open the water stop valve, and allow water to flow through the waterway again.

However, when water is recirculated, even if the hot water tap is blocked, the air in the waterway will be compressed and a water flow will occur in the waterway until the pressure reaches the same pressure as the water supply pressure, during which time the hydraulic response device will operate. When the pilot burner is in the ignited state, the gas burner burns, causing the inconvenience that the heat exchanger is heated even though the water heater is not in use.

The present invention is aimed at solving the above-mentioned disadvantages, and will be specifically explained below based on an embodiment shown in the drawings.

Reference numeral 1 denotes a waterway in which a water stop valve 2, a heat exchanger 3, and a hot water supply valve 4 are interposed from upstream. On the hot water supply side of the waterway 1, a gas valve 7 provided in a gas path 6 leading to a gas burner 5 controls opening and closing. Pressure introduction pipes 11 and 12 to both high and low pressure side chambers 9 and 10 of the hydraulic response device 8
is connected, and the water supply source pressure is in the high pressure side chamber 9 of the device.
Low pressure generated by a low pressure generating section 13 is introduced into the low pressure side chamber 10 .

Reference numeral 14 denotes a check valve disposed downstream of the low pressure generating section 13 of the waterway 1, and the check valve body 15 is always operated by a spring 16 in a direction that closes the downstream opening 18 of the narrow passage 17 forming the low pressure generating section 13. is energized by

19 is a safety valve, and 20 is a pilot burner.

Reference numeral 21 designates a drain valve for draining water from both the high and low pressure side chambers 9 and 10 of the hydraulic response device 8, and 22 designates a drain valve disposed on the hot water supply side of the water channel 1.

The present invention has an above-ground configuration, and under normal conditions, the drain valve 21.2
2 and the hot water tap 4 are closed, the water stop valve 2 is open, the water channel 1 is full of water, and the check valve body 15 closes the downstream opening 18 of the narrow passage 17 due to spring pressure. It is in.

When using a water heater, open the safety valve 19, ignite the pilot burner 20, and then open the hot water tap 4.
A water flow is generated inside and the check valve 14 is opened, and the water supply source pressure is introduced into the high pressure side chamber 9 of the hydraulic response device 8, and low pressure is introduced into the low pressure side chamber 10, and the gas valve T is opened and the gas burner 5 starts combustion. Become.

Therefore, for example, in a circulating hot water supply type bath pot, when using the bath pot, it is necessary to close the water stop valve 2, open the hot water supply tap 4 and the drain valves 21 and 22, and drain water from the water channel 1. In order to use the water heater again after stopping the water heater, water must be re-entered into the water channel 1.

However, in the present invention, the water in the water channel 1 downstream of the check valve 14 remains without being drained, and the range of water flowing into the water channel 1 is only the water channel 1 upstream of the check valve 14.

On the other hand, the pressure introduction part of the hydraulic response device 8 is located close to the check valve 14 on the hot water supply side of the waterway, so that the pressure introduction part of the hydraulic response device 8
The pressure is not introduced into the high pressure side chamber 9 until the water reaches the pressure introduction part, and the water flow space between the pressure introduction part and the check valve 14 is small, so the water flow time after pressure is introduced into the high pressure side chamber 9 is extremely long. It will be short.

The pressure difference caused by the flow of water between the high and low pressure side compartments of the water discharge pressure response device 8 is instantly resolved, and even though the hot water tap is blocked when water is re-entered after draining in this type of stop-start water heater, This prevents the gas valve from opening and causing the gas burner to burn.

In this embodiment, a check valve is used, but in other embodiments, a check valve is not used and only the hot water tap is provided close to the pressure introduction part, but the same effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is a sectional view of the main parts. 1... Waterway, 2... Water stop valve, 3... Heat exchanger, 4
... Hot water tap, 7... Gas valve, 8... Water pressure response device, 10... Low pressure side chamber, 13... Low pressure generation part, 14.
...Check valve, 21゜22...Drain valve.

Claims (1)

[Scope of utility model registration request] A water pressure response device that controls the opening and closing of a gas valve is placed on the hot water supply side of a waterway equipped with a drain valve, a stop valve, and a heat exchanger. A pre-stop instantaneous water heater characterized by being equipped with a stop valve or hot water tap.