JPH0712860U - Water heater - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a hot-water storage type hot water supply device that can improve usability and expand the range of use. A fuel combustion unit 2, a heat exchanger, and a hot water storage tank 1, which is provided integrally with or separately from the heat exchanger and stores hot water heated by the heat exchanger, a heat exchanger and / or the hot water storage tank 1, pressure reducing means 8 for controlling the water supply pressure to a set value so that the water supply pressure is not directly applied, and when a pressure higher than the pressure controlled by the pressure reducing means 8 is applied to the heat exchanger and / or the hot water storage tank 1. An overpressure relief means 7 for opening the valve to lower the pressure in the heat exchanger and / or the hot water storage tank 1, and a water flow detection means 6 for detecting that water has flowed into the heat exchanger are provided, and the water flow detection means 6 is provided. When the water flow is detected by the water heater, the control pressure of the pressure reducing means 8 and the valve opening pressure of the overpressure releasing means 7 are increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot water storage type water heater.

[0002]

[Prior art]

 In the water heater, so that the hot water becomes stable when it is used, a so-called hot water storage system is used in which hot water that has undergone heat exchange is stored in a hot water storage tank to reduce instability of the hot water, and the amount of combustion is changed continuously. There is a type (flow-through type) that stabilizes hot water. The method of continuously changing the amount of combustion can provide a relatively stable state of hot water, but there are cost disadvantages such as the need for dedicated parts. Furthermore, when oil is the fuel, the amount of combustion is Since the range of continuous change of water is narrow, a hot water storage type is often adopted.

[0003]

[Problems to be Solved by the Invention]

In the case of a hot-water storage water heater, stable hot water can be achieved at a relatively low cost, but the pressure that can be used is legally regulated to 1 kg / cm ² or less. Even if the water heater is installed downstairs, sufficient pressure cannot be obtained, and if the water heater is installed downstairs, there is a problem that the usage range is limited because hot water cannot be supplied to the upper floors. There is. The present invention is to provide a hot water storage type hot water supply device capable of improving the usability and expanding the range of use while taking advantage of the hot water storage type.

[0004]

[Means for Solving the Problems]

 The present invention is directed to a fuel combustion section, a heat exchanger, a hot water storage tank that is provided integrally with or separately from the heat exchanger, and stores hot water heated by the heat exchanger, the heat exchanger and / or the hot water storage tank. A decompression means that controls the water supply pressure to a set value so that the water supply pressure is not directly applied to the tank, and opens when a pressure higher than the pressure controlled by the pressure reducing means is applied to the heat exchanger and / or the hot water tank. A valve is provided with an overpressure relief means for reducing the pressure in the heat exchanger and / or the hot water storage tank, and a water flow detection means for detecting that water has flowed into the heat exchanger. The water flow detection means detects the water flow. In this case, the present invention relates to a water heater in which the control pressure of the pressure reducing means and the valve opening pressure of the overpressure releasing means are increased.

As described above, the hot water storage type hot water supply device is legally regulated to have a working pressure of 1 kg / cm ² or less. On the other hand, in the once-through type water heater, the operating pressure is allowed up to 10 kg / cm ² . Looking at the difference between the hot water storage type and the once-through type, in the hot water type, for example, starting and stopping combustion by hot water in the hot water storage tank is performed regardless of whether or not water flows into the heat exchanger. The difference is that combustion occurs only when water flows into the heat exchanger. According to the present invention, in a hot water storage type water heater, a water flow detecting means for detecting a water flow in a water passage to a heat exchanger, a pressure reducing means for switching a water supply pressure, and an overpressure relief means for switching a valve opening pressure downstream of the pressure reducing means. When the inflow of water into the heat exchanger is detected by the water flow detection means, the control pressure of the decompression means and the valve opening pressure of the overpressure relief means are increased to increase the working pressure and improve usability. Is to improve.

[0006]

[Action]

 As described above, the depressurizing means, the overpressure releasing means, and the water flow detecting means, whose pressure can be switched, are operated in association with each other, and the operating pressure is switched between the time of use and the time of nonuse. Improve the usability of the water heater.

[0007]

【Example】

Next, an embodiment of the present invention will be described. FIG. 1 is a structural view of a water heater according to an embodiment of the present invention, 1 is a hot water storage tank integrated with a heat exchanger, 2 is a petroleum fuel combustion unit, 3 is a remote controller, 4 is a controller, and 5 is hot water storage The thermistor that detects the temperature of the hot water in the tank 1, 6 is a water flow switch that detects the inflow of water into the heat exchanger / hot water storage tank 1, and 7 is the overpressure relief valve set as overpressure relief means, and the setting is 0. .9kg / cm ² of overpressure relief valves 7a, configuration consists of an electromagnetic valve 7c of the overpressure relief valve 7b and normally open (normally open) of 3.1 kg / cm ^2. Reference numeral 8 denotes a pressure reducing valve group as a pressure reducing means, which is composed of a pressure reducing valve 8a having a setting of 0.8 kg / cm ^2, a pressure reducing valve 8b having a setting of 3 kg / cm ² , and a normally closed (normally closed) solenoid valve 8c. . Reference numeral 9 is a hot water supply curran.

When the hot water supply scallop 9 is closed, the operation of the conventional hot water storage type water heater is performed. That is, the thermistor 5 detects the temperature of the hot water in the hot water storage tank 1, and if the temperature is lower than the temperature set by the remote controller 3, the combustion section 2 is put into a burning state and the hot water in the hot water storage tank 1 is passed through the heat exchanger. Heat the water (hot water) to bring it to the set temperature. At this time, since the solenoid valve 7c is open and the solenoid valve 8c is closed, the working pressure is 1 kg / cm ² or less, which satisfies the legal limit.

When the hot water supply run 9 is opened, water flows into the heat exchanger / hot water storage tank 1, and the water flow switch 6 detects it. When the water flow is detected, the solenoid valve 7c operates and closes, while the solenoid valve 8c opens. By this operation, the supply pressure to the heat exchanger / hot water storage tank 1 becomes 3 kg / cm ² , and the overpressure relief pressure becomes 3.1 kg / cm ² , so that the supply pressure to the hot water supply column 9 also becomes high. In addition, since the start and stop of combustion in this case is controlled by both the signal from the water flow switch 6 and the temperature signal from the thermistor 5 and the remote controller 3, the operating pressure is 10 kg which is the limit of the once-through water heater. / Cm ² or less can be raised.

In this embodiment, two pressure reducing valves and two overpressure relief valves are used, and the passages thereof are switched by an electromagnetic valve. However, one pressure reducing valve and one overpressure relief valve are used. The same effect can be obtained even if the control pressure and the valve opening pressure are changed based on the water flow signal.

[0011]

[Effect of device]

 According to the present invention, the following effects can be obtained. (1) Even though it is a hot water storage type, the water pressure can be increased, so the same usability as the direct connection type can be obtained. (2) Since the performance of the hot water storage system remains, the desired temperature can be obtained even when the amount of hot water used is small.

[Brief description of drawings]

FIG. 1 is a view showing a structure of a water heater according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank, 2 ... Combustion part, 3 ... Remote control, 4 ... Controller, 5 ... Thermistor, 6 ... Water flow switch, 7 ... Overpressure relief valve set, 8 ... Pressure reduction valve set, 9 ... Hot water supply currant

Claims (1)

[Scope of utility model registration request] 1. A fuel combustion section, a heat exchanger, a hot water storage tank which is provided integrally with or separately from the heat exchanger and stores hot water heated by the heat exchanger, a heat exchanger and / or the hot water storage tank. The pressure reducing means for controlling the water supply pressure to a set value so that the water supply pressure is not directly applied to, the valve is opened when a pressure higher than the pressure controlled by the pressure reducing means is applied to the heat exchanger and / or the hot water storage tank, An overpressure relief means for lowering the pressure in the heat exchanger and / or the hot water storage tank, and a water flow detection means for detecting the inflow of water into the heat exchanger are provided, and when the water flow detection means detects a water flow, the pressure is reduced. A water heater in which the control pressure of the means and the valve opening pressure of the overpressure relief means are increased.