JP4688054B1 - Expansion water treatment device for sealed water heater - Google Patents

Abstract

An expanded water treatment apparatus for a sealed water heater that prevents damage to a resin drain pipe by constantly lowering the temperature of expanded water and leaked water generated in the sealed water heater to a safe temperature.
An air vent pipe 4 for discharging the air generated in the hot water storage tank 1 is installed at a position higher than the hot water supply pipe 3 provided in the hot water storage tank 1 of the sealed water heater. An electromagnetic valve 5 is provided in which the discharge port of the air vent pipe 4 is regularly opened. A cooling pipe 6 is connected in the middle of the air vent pipe 4 to supply cooling water into the air vent pipe 4. A thermostat for detecting the temperature of the air vent pipe 4 near the solenoid valve 5 is attached. When the temperature is a certain level or more, the solenoid valve 5 is forcibly opened.
[Selection] Figure 1

Description

  The present invention relates to an expansion water treatment apparatus for a sealed water heater that can prevent a phenomenon in which expanded water generated in a sealed water heater becomes a high-temperature leaked water during pressure adjustment.

  In a water heater using a sealed tank, when the hot water in the sealed tank is boiled up, the air dissolved in the water cannot be dissolved, and a part of the gas state (hereinafter referred to as “air”) is obtained. Also, the hot water in the tank expands and the internal pressure in the sealed tank rises. Therefore, in order to keep the internal pressure of the sealed tank constant, a pressure relief valve that automatically releases air and expanded water that exceeds a certain pressure, and an open valve that periodically discharges air etc. are mounted on the top of the sealed tank. It was.

  However, when the hot water and air expanded by the pressure relief valve are released, the heated hot water is also discharged at the same time, resulting in a loss of hot water storage energy. Therefore, Patent Document 1 proposes a hot water storage type hot water heater that can appropriately discharge expansion water and air in order to eliminate such energy loss due to expansion water.

  According to Patent Document 1, a configuration is adopted in which a pressure relief valve is provided at a position higher than the hot water discharge pipe and different from the hot water discharge pipe. Furthermore, in patent document 1, in addition to this pressure relief valve, a mixing valve, a float valve, or a separation membrane for separating gas and liquid is used in combination, so that the hot water operation and the expanded water discharge process are performed independently. This eliminates energy loss.

Japanese Unexamined Patent Publication No. 2009-243813

  Conventionally used pressure relief valves have a mechanical structure using springs or rubber, so that the pressure relief valve is automatically opened when air or expansion water exceeds the allowable pressure of the pressure relief valve. In Patent Document 1, an attempt is made to lower the temperature of expansion water by connecting a cooling water supply pipe to a pipe provided with this pressure relief valve.

  On the other hand, instead of the pressure relief valve, there is an option to use an open valve that periodically opens air or expanded water. Since these pressure relief valves and release valves are repeatedly opened and closed over a long period of time, the valve body of the release valve may be damaged over time, or foreign matter may be caught on the sealing surface of the valve body. When such a symptom occurs, high-temperature expanded water is continuously discharged as leaked hot water from the valve that should have been blocked. Therefore, in order to lower the temperature of the leaked hot water, it is necessary to connect a cooling water supply pipe to a pipe provided with an open valve.

  However, as a result of the inventor's research on leaked hot water, even if a cooling water pipe is connected to lower the temperature of the expanded water, if the amount of leaked hot water is small, the expanded water is cooled from the water supply pipe. It was clarified that a phenomenon that hot expanded water continues to flow slightly without mixing with water occurs. That is, the cooling water is supplied at the same time as the opening valve is opened and the expansion water is discharged, but does not move when the opening valve is closed. Therefore, if there is a slight amount of leaking hot water, high-temperature expanded water will continue to flow only in the discharge route of the leaking hot water, and the temperature will not drop due to cooling water.

  As described above, the high-temperature leaked hot water discharged from the water heater through the pressure relief valve or the open valve is discharged into a resin drain pipe which is a general drainage channel. However, since a general resin drain pipe does not consider the durability when hot hot water is continuously discharged, even if a small amount of leaked hot water is discharged continuously at a high temperature, An unexpected inconvenience occurred that the resin drain pipe was damaged.

  Therefore, the present invention was created to solve the above-mentioned problems, and by preventing the phenomenon in which high-temperature expansion water is continuously discharged from the sealed water heater, the resin exhaust pipe is prevented from being damaged, An object of the present invention is to provide an expansion water treatment apparatus for a sealed water heater that can be used safely.

In order to achieve the above-mentioned object, the first means in the present invention is a separate air vent pipe 4 for discharging the air generated in the hot water storage tank 1 at a position higher than the hot water supply pipe 3 provided in the hot water storage tank 1. In addition, an electromagnetic valve 5 is provided in which the discharge port of the air vent pipe 4 is regularly opened, and a cooling pipe 6 is connected to the air vent pipe 4 in the air vent pipe 4. In a sealed water heater configured to supply cooling water , a thermostat 7 is mounted on the surface of the air vent pipe 4 between the cooling pipe 6 and the solenoid valve 5 so that the surface temperature of the pipe exceeds a certain level. In this case, the electromagnetic valve 5 is energized and forcibly opened .

  In the second means, the air vent pipe 4 is a copper pipe.

  In the third means, the temperature detecting device uses an automatic return bimetal having an operating temperature of around 55 ° C.

As in claim 1 of the present invention, a temperature detecting device for detecting the temperature in the vicinity of the electromagnetic valve 5 of the air bleeding pipe 4 is mounted, and when the temperature is a certain temperature or more, the electromagnetic valve 5 is forcibly opened. In the case where the amount of leaked hot water is small, the expansion water is not mixed with the cooling water, and the possibility that the high-temperature expansion water continues to flow is solved. Moreover, the electromagnetic valve 5 is forcibly opened when the thermostat 7 is mounted on the surface of the air vent pipe 4 between the cooling pipe 6 and the electromagnetic valve 5 and the surface temperature of the pipe is above a certain level. By configuring as described above, temperature detection in the vicinity of the electromagnetic valve 5 can be simplified and detected reliably .

According to the second aspect, since the air vent pipe 4 is a copper pipe , temperature detection in the vicinity of the electromagnetic valve 5 can be simplified and reliably detected.

  As described in claim 3, the temperature of the leaked hot water can be suppressed to about 60 ° C. or less by using a bimetal having an operating temperature of around 55 ° C. as the temperature detecting device. As a result, it can be used safely for a long time without damaging a general resin drain pipe.

1 is a system configuration diagram showing an embodiment of the present invention. It is a principal part perspective view which shows one Example of this invention. It is a principal part side view which shows the state which mounted | wore the air vent pipe of this invention with the thermostat.

  According to the present invention, the expanded water generated in the sealed water heater becomes a leaked hot water, preventing a phenomenon in which the high-temperature expanded water continues to flow, and can be used safely. The original purpose, such as preventing damage to the resin drain pipe by constantly lowering the temperature to a safe temperature, was achieved.

  An embodiment of the present invention will be described below with reference to the drawings. The treatment apparatus of the present invention is used for a sealed water heater. This sealed water heater is a type mainly used for hot water for drinks and washings. In the example shown in the drawing, the drinking water supply pipe 3 for supplying hot water of about 90 ° C., for mixing for supplying hot water of about 50 ° C. The hot water supply pipe 10 and the secondary water supply pipe 11 are provided (see FIG. 2). Further, a temperature adjusting bypass pipe 8 is connected to a water supply pipe 2 for supplying water from the water pipe to the hot water storage tank 1, and is connected to the above-described hot water supply pipe 3, hot water supply pipe 10, and secondary water supply pipe 11. Furthermore, a swelled water discharge pipe 9 is connected to the water supply pipe 2 via a pressure relief valve 12, and the expanded water expanded in the hot water storage tank 1 is discharged together with the water in the water supply pipe 2 (see FIG. 1). . In addition, this sealed water heater is not limited to the illustrated example, and can be any water heater that uses the sealed hot water storage tank 1.

  The basic configuration of the processing apparatus of the present invention mounted on such a water heater is composed of an air vent pipe 4, an electromagnetic valve 5, a cooling pipe 6, and a temperature detector.

  The air vent pipe 4 is installed at a position higher than the hot water supply pipe 3 provided in the hot water storage tank 1 and is configured to independently discharge the expanded air expanded in the hot water storage tank 1. Air or expanded water generated in the hot water storage tank 1 is discharged from the upper part of the hot water storage tank 1 to the outside through the air vent pipe 4.

  The solenoid valve 5 is provided with a discharge port of the air vent pipe 4 on the side, and periodically releases the air and expansion water accumulated in the air vent pipe 4.

  The cooling pipe 6 is connected in the middle of the air vent pipe 4, and is configured to supply cooling water into the air vent pipe 4 to lower the temperature in the air vent pipe 4. Normally, the air vent pipe 4 is in a hermetically sealed state, and cooling water is supplied from the cooling pipe 6 into the air vent pipe 4 when the air vent pipe 4 is periodically opened by the electromagnetic valve 5.

  However, when a slight amount of leaked hot water is flowing out from the solenoid valve 5, there is a phenomenon in which there is no movement of the cooling water and it continues to flow slightly as high-temperature expansion water. Therefore, the temperature of the air vent pipe 4 in the vicinity of the electromagnetic valve 5 is detected, and when the temperature is higher than a certain level, the electromagnetic valve 5 is forcibly opened so that the cooling water is supplied from the cooling pipe 6 to the air vent pipe 4. It is configured to be supplied.

  In order to detect the temperature in the vicinity of the electromagnetic valve 5 of the air vent pipe 4, it is possible to use a temperature detection device such as a thermostat 7 or a temperature sensor. For example, a temperature sensor can be installed inside the air vent pipe 4 to directly measure the temperature inside the air vent pipe 4. It is also possible to detect the surface temperature of the air vent pipe 4 and use it as a guide for the internal temperature.

  In the illustrated example, a copper pipe is used for the air vent pipe 4, a thermostat 7 is mounted on the surface of the copper pipe between the cooling pipe 6 and the solenoid valve 5, and forced when the surface temperature of the pipe is above a certain level. It is configured to open (see FIG. 3). Examples of the thermostat 7 include mechanical detection using a bimetal or a shape memory alloy, detection based on expansion of wax particles, electrical detection using a thermistor, and electrical detection using a thermocouple.

  In the experiment, an automatic return bimetal having an operating temperature of around 55 ° C. was used as the thermostat 7. That is, when the automatic return bimetal detects when the leaked hot water temperature exceeds 55 ° C., the solenoid valve 5 is energized and forcibly opened. Then, cooling water is supplied from the cooling pipe 6 to the air vent pipe 4, and the temperature in the vicinity of the solenoid valve 5 is lowered. When the automatic return bimetal detects that the temperature of the air vent pipe 4 has decreased, the automatic return bimetal returns to shut off the energization of the solenoid valve 5 and the solenoid valve 5 is closed. As a result, it became possible to adjust the temperature of the leaked hot water to 60 ° C. or lower. This temperature of 60 ° C. or lower is a temperature at which continuous use is possible in a resin drain pipe such as a hard PVC lined steel pipe for water supply. In the figure, reference numeral 4A denotes a reverse support valve provided in the air vent pipe 4, and reference numeral 6A denotes a reverse support valve provided in the cooling pipe 6.

  When leaking hot water continues, the operation of the thermostat 7 detecting and forcibly opening the solenoid valve 5 is repeated. By confirming such an operation, the operator notices the presence of leaked hot water. Further, as means for more actively informing the presence of leaking hot water, an error display is displayed when the thermostat 7 is detected, or the solenoid valve 5 is shut off and the heater power is shut off. It is possible to notify the presence of leaked hot water, that is, the malfunction of the electromagnetic valve 5.

  In the processing apparatus of the present invention, the mounting position of the electromagnetic valve 5 or the temperature detector, the connection position of the cooling pipe 6 and the like are not limited to the embodiment, and the design change within a range not changing the gist of the present invention is possible. Be free.

  According to the present invention, it is mainly described as a sealed water heater for drinks and washings, but the capacity and purpose of use of the water heater are not limited to this type, and it has a structure of a sealed water heater. Any hot water heater may be used as long as the boiling temperature is high.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 3 Hot water supply pipe 4 Air vent pipe 4A Reverse support valve 5 Solenoid valve 6 Cooling pipe 6A Reverse support valve 7 Thermostat 8 Bypass pipe 9 Swelling water discharge pipe 10 Hot water supply pipe 11 Secondary water supply pipe 12 Pressure relief valve

Claims (3)

A separate air vent pipe that discharges the air generated in the hot water storage tank is installed at a position higher than the hot water supply pipe provided in the hot water storage tank, and the exhaust port of the air vent pipe is opened periodically. A sealed water heater configured to supply a cooling water in the air vent pipe by connecting a cooling pipe in the middle of the air vent pipe, and a cooling pipe and an electromagnetic valve in the air vent pipe. An expansion water treatment apparatus for a sealed water heater, wherein a thermostat is attached to the surface of the pipe between the two, and when the surface temperature of the pipe is above a certain level, the solenoid valve is energized and forcibly opened .   The expansion water treatment apparatus for a sealed water heater according to claim 1, wherein the air vent pipe is a copper pipe.   The expansion water treatment device for a closed water heater according to claim 1, wherein the temperature detection device uses an automatic return bimetal having an operating temperature of around 55 ° C.

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