JPH0532953U - Electric water heater - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an electric water heater that has a function of reheating a bathtub and is capable of using hot water beyond the capacity of the hot water storage tank. [Structure] A hot water storage tank having a water supply port at the bottom, an auxiliary tank which is arranged above the hot water storage tank and whose interior communicates with the inside of the hot water storage tank through a connecting pipe, and electric heating for heating the hot water storage tank and the water in the auxiliary tank And a hot water outlet provided in the connecting pipe, a main hot water pipe having one end communicating with the hot water outlet and the other end communicating with a hot water tap, and one end communicating with the upper part of the auxiliary tank and the other end having the above-mentioned structure. It is provided with an auxiliary feed pipe communicating with the hot water tap and a valve for switching the flow path of hot water to the hot water tap to either the main hot water pipe or the auxiliary hot water pipe. A heat exchanger used to reheat the hot water in the bathtub is arranged inside the auxiliary tank.

Description

[Detailed description of the device]

[0001]

[Field of Industrial Application] The present invention relates to an electric water heater used for supplying hot water to a bathtub in a general house.

[0002]

2. Description of the Related Art As an electric water heater used for supplying hot water to a bathtub, there is a hot water storage tank having a water supply port at the bottom and a hot water outlet at the top, and an electric heater attached to the bottom of the tank. In general, the structure is such that the water stored in the hot water storage tank is heated by a heater provided at the bottom, and the convection of water by this heating raises the temperature of the entire water in the hot water storage tank to the boiling temperature.

[0003]

[Problems to be Solved by the Invention] By the way, in a bath unit or the like used in a recent residential facility, even if the unit is of a type in which hot water is supplied from an electric water heater to store hot water in the bath, Although there is a demand for additional hot water and heat retention for hot water, the electric water heater with the above-mentioned general structure cannot meet that requirement. The equipment was installed separately from the electric water heater, which contributed to the high cost of housing equipment. Furthermore, there remains a problem that an additional installation space for the heating device is required.

In addition, in an electric water heater having a general structure, when hot water is used in excess of the hot water storage capacity of the hot water storage tank, so-called hot water drainage may occur, such that only low-temperature water comes out from the hot water tap. The present invention has been made to solve the above-mentioned conventional problems all at once. The purpose of the present invention is to provide a function to reheat the hot water in the bathtub and use more hot water than the hot water storage capacity of the hot water storage tank. It is to provide an electric water heater capable of.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] A structure for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention provides a hot water storage tank 1 having a water supply port 1a at the bottom and a hot water storage tank. An auxiliary tank 2 which is arranged above the tank 1 and whose inside communicates with the inside of the hot water storage tank 1 through a connecting pipe 10, and an electric heater (for example, an electric heater) that heats water stored in the hot water storage tank 1 and the auxiliary tank 2. 3), a hot water outlet 1b provided on the connecting pipe 10, a main hot water supply pipe 11 having one end communicating with the hot water outlet 1b and the other end communicating with the hot water tap 4, and one end at the upper part of the auxiliary tank 2. Auxiliary hot water supply pipe 12 that communicates with the other end of the hot water supply tap 4 and valves 11a and 12a for selectively switching the hot water flow path to the hot water supply tap 4 to either the main hot water supply pipe 11 or the auxiliary hot water supply pipe 12. Is equipped with. Further, the heat exchanger 5 used to reheat the hot water in the bathtub 20 is arranged inside the auxiliary tank 2 and is characterized.

[0006]

When the water in the tank is heated by, for example, the electric heater 3 attached to the bottom of the hot water storage tank 1, the temperature of the water in the hot water storage tank 1 rises due to the driving of the electric heater 3, and further, through the connecting pipe 10. The water temperature in the auxiliary tank 2 also rises, and the entire water in the hot water storage tank 1 and the auxiliary tank 2 can be boiled up. During the boiling and during the normal use of hot water, the valve 11a of the main hot water supply pipe 11 is opened and the valve 12a of the auxiliary hot water supply pipe 12 is closed.

On the other hand, when the hot water tap 4 is opened when hot water is used, the hot water in the upper part of the hot water storage tank 1 is supplied through the main hot water supply pipe 11 connected to the connecting pipe 10, whereby the hot water in the auxiliary tank 2 fluctuates. Instead, the inside is always filled with hot water. Therefore, if the hot water from the bathtub 20 is circulated through the heat exchanger 5 arranged in the auxiliary tank 2, the hot water in the bathtub 20 can be reheated.

Here, even when hot water having a capacity larger than the hot water storage capacity of the hot water storage tank 1 is used, by closing the valve 11 a of the main hot water supply pipe 11 and opening the valve 12 a of the auxiliary hot water supply pipe 12, the auxiliary tank 2 It is possible to use hot water of the capacity.

[0009]

Embodiment FIG. 1 is a piping system diagram showing a configuration of an embodiment of the present invention. An auxiliary tank 2 is arranged above the hot water storage tank 1, and the insides of the two tanks 1 and 2 communicate with each other through a connecting pipe 10. A water supply port 1a is provided at the bottom of the hot water storage tank 1, and a hot water outlet 1b is provided in the middle of the connecting pipe 10, and the water supply port 1a communicates with a water supply pipe 13. On the other hand, the hot water outlet 1b communicates with the main hot water supply pipe 11 to which the valve 11a is connected. A hot water tap 4 is connected to the tip of the main hot water supply pipe 11.

An electric heater 3 is arranged at the bottom of the hot water storage tank 1. An auxiliary hot water supply pipe 12 to which a valve 12a is connected communicates with an upper part of the auxiliary tank 2, and an end portion of the auxiliary hot water supply pipe 12 is a main hot water supply pipe 11 between the valve 11a and the hot water tap 4. Is in communication with. The valve 12a and the previous valve 11a are opened and closed when the normal hot water is used.

A heat exchanger 5 is arranged inside the auxiliary tank 2. The heat exchanger 5 has a structure in which a stainless steel pipe or the like is wound in a coil shape, and its water inlet and outlet are connected to the inside of the bath 20 through a forward pipe 21 and a return pipe 22, respectively. A circulation pump 21a is connected to the outflow pipe 21, and the hot water in the bathtub 20 can be circulated through the heat exchanger 5 by driving the pump 21a.

In the above-described embodiment of the present invention, by driving the electric heater 3, the entire water in the hot water storage tank 1 and the auxiliary tank 2 can be boiled up, and when the normal hot water is used, the hot water storage tank 1 Since hot water is sequentially supplied from above, the hot water at the boiling temperature is always secured in the auxiliary tank 2. Therefore, if the circulating pump 21a is driven to supply the hot water in the bath 20 to the heat exchanger 5 in the auxiliary tank 2, the hot water is heated and then returns to the bath 20 again. This makes it possible to heat the hot water in the bathtub and keep it warm. The circulation pump 21a is generally driven and stopped by, for example, monitoring the temperature of the hot water in the bathtub 20 with a controller (not shown) on the bathroom side and controlling the hot water to reach the set temperature. It is good to adopt such a system.

When hot water having a capacity larger than that of the hot water storage tank 1 is used, the hot water in the auxiliary tank 2 is used by closing the valve 11a of the main hot water supply pipe and opening the valve 12a of the holding hot water supply pipe. You can The valves 11a and 12a are opened and closed by, for example, providing a temperature sensor for detecting the water temperature in the upper part of the hot water storage tank 1, and when the sensor output detects the temperature of the low-temperature water, the electric water heater side It may be configured so as to be automatically performed under the control of a controller or the like. Further, a three-way valve may be arranged at the confluence of the main hot water supply pipe 11 and the auxiliary hot water supply pipe 12 instead of the structure of the two valves 11a and 12a.

In the above embodiments, the electric heater 3 is attached to the bottom of the hot water storage tank 1, and the electric heater 3 heats the water in the hot water storage tank 1 and the auxiliary tank 2 to boil the water. However, without being limited to this, a circulation piping system for returning the water at the bottom of the hot water storage tank 1 to the upper portion of the auxiliary tank 2 is provided, and an electric heater is connected to this circulation piping system. The entire water in the hot water storage tank 1 and the auxiliary tank 2 may be boiled by heating by circulation.

[0015]

As described above, according to the present invention, an auxiliary tank that communicates with the inside of the hot water storage tank through a connecting pipe is provided at the upper part of the hot water storage tank, and the hot water storage tank and the entire water in the auxiliary tank are connected. Is heated by an electric heater attached to the bottom of the hot water storage tank, and a heat exchanger used to reheat the hot water in the bathtub is installed inside the auxiliary tank. Both the hot water supply and the additional heating of the hot water in the bathtub are possible with the water heater. As a result, there is no need to separately install a device for additional cooking of hot water in the bathtub, which can reduce construction costs and save space.

Further, since the hot water stored in the auxiliary tank can be supplied by switching the valve, there is an effect that the hot water having a capacity larger than that of the hot water storage tank can be used.

[Brief description of drawings]

FIG. 1 is a piping system diagram showing a configuration of an embodiment of the present invention.

[Explanation of Codes] 1 ... Hot water storage tank 1a ... Water inlet 1b ... Hot water outlet 2 ... Auxiliary tank 3 ... Electric heater 4 ... Hot water tap 5 ... ..Heat exchanger 10 ... Connection pipe 11 ... Main hot water supply pipe 11a ... Valve 12 ... Auxiliary hot water supply pipe 12a ... Valve 20 ... Bath 21 ...・ Outward piping 21a ・ ・ ・ ・ Circulation pump 22 ・ ・ ・ ・ Return piping

Claims (1)

[Scope of utility model registration request] 1. A hot water storage tank having a water supply port at the bottom, an auxiliary tank which is arranged above the hot water storage tank and whose inside communicates with the inside of the hot water storage tank through a connecting pipe, and the hot water storage tank and the auxiliary tank. An electric heater for heating the stored water, a tap hole provided in the connecting pipe,
A main hot water supply pipe having one end communicating with the hot water outlet and the other end communicating with the hot water supply tap; an auxiliary hot water supply pipe having one end communicating with the upper part of the auxiliary tank and the other end communicating with the hot water supply tap; A valve for selectively switching the hot water flow path to either the main hot water supply pipe or the auxiliary hot water supply pipe is provided, and a heat exchanger used to reheat the hot water in the bathtub is provided inside the auxiliary tank. An electric water heater that is arranged.