JPH04214145A - Hot-water supplier - Google Patents

Abstract

PURPOSE:To provide a hot-water supplier, preventing the malfunction of a thermistor controlling a circulating pump for circulating hot-water and capable of being utilized for the defection of freezing of a hot-water circulating circuit. CONSTITUTION:The circulating circuit of hot-water is constituted of a circulating pump 27, a primary filter 30, a secondary filter 31, a tubular body 3, a supplying side connecting port 34, and a returning side connecting port 35, to which a thermistor 37 is attached. The returning side connecting port 35 is provided at the lowermost part of the circulating circuit and at the lower part of a main body 41. Accordingly, hot-water in a circulating pipe 36 is circulated by the natural convection thereof and abnormal heating of the part of the thermistor 37 will never be caused as far as the tubular body 3 is heated even when the circulating pump 27 is stopped. On the other hand, the position of the thermistor 37 is a part having the lowest temperature in the circulating circuit whereby the part whereat the thermistor 37 is positioned is frozen before the freezing of water in any part in the circulating circuit.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater in which a heat exchanger is provided in a water chamber between an inner and outer body of the can.

0002

BACKGROUND OF THE INVENTION In recent years, water heaters have become more and more popular, and they are indispensable in daily life and are increasingly being used for multiple purposes.

An example of the above-mentioned conventional water heater will be explained below with reference to the drawings. FIG. 4 shows a longitudinal section of a conventional water heater. Reference numeral 1a indicates an outer shell, and 2a indicates an inner shell.Both ends of the inner and outer shells 2a and 1a are welded together to form a watertight water chamber, which constitutes a can body. 3a is a water supply port provided on the side of the can body, and 4a is a hot water supply port, which is supplied with hot water through a piping connection or the like. 5a is the inner body 2a
A heating element installed inside the can heats the water inside the can water chamber. 6a
1 shows a tube body for a heat exchanger provided on the high temperature side in the water chamber, and similarly to the can body, it is provided with a water supply port 7a and a hot water supply port 8a, and is connected to piping to form a circulation circuit to supply other hot water.

[0004] That is, the water in the tube body 6a is secondarily heated by the heating element 5a via the water in the can body. Reference numeral 9a denotes a baffle plate, to which the chimney 10a is connected to the upper part and the burner ring 11a is connected to the lower part. The burner ring 11a is the inner shell 2
A heating chamber is formed by the heating body 5a within the baffle plate 9a.
In this case, a flow path is formed along the inner shell 2 so that the hot air flow in the heating chamber by the heating body 5a can effectively heat the water in the water chamber of the can. The chimney 10a is used to exhaust the hot air flow caused by the heating element 5.

Regarding the water heater configured as above,
The operation will be explained below. First, water is supplied to the water chamber in the can body through the water supply port 3a, and when it becomes full, water flows out through the hot water supply port 4a. On the other hand, a water supply port 7a is connected to the tube body 6a for the heat exchanger.
When the water becomes full, water flows out from the hot water supply port 8a, forming a circulation circuit. On the other hand, the water in the water chamber in the can body is first heated by the heating element 5a in the inner shell 2a, and then, at the same time, the water in the tube body 6a for the heat exchanger is also heated and used for each hot water supply.

[0006]

[Problems to be Solved by the Invention] However, in the conventional configuration as described above, a thermostat is not attached to the circulation circuit formed by the heat exchanger tube and piping in the water chamber, and therefore, the piping may be damaged due to freezing during winter. This has caused problems such as destruction and unusability.

In view of the above-mentioned problems, the present invention provides a water heater that prevents malfunction of a thermistor that controls a hot water circulation pump and also allows the thermistor to be used to detect freezing of a hot water circulation circuit.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the water heater of the present invention has a water chamber formed between an outer shell and an inner shell to form a can body, and a heating element inside the inner shell. At the same time, a heat exchanger formed of a tube is provided in the water chamber, and the circulation circuit of this heat exchanger is connected to a circulation pump, a primary filter, a secondary filter, a tube, an outgoing connection port, and a thermistor for controlling the circulation pump. The return side connection port is provided at the lowest part of the circulation circuit and in the lower part of the main body in which the can body is installed.

[0009]

[Function] With the above-described configuration of the present invention, the hot water in the circulation circuit of the heat exchanger will undergo natural convection even if the circulation pump stops, as long as there is a heating effect, and the temperature will particularly rise in the part where the thermistor is located. The thermistor will not malfunction without doing so. In addition, since the return side connection port where the thermistor is located has the lowest temperature, the thermistor is installed to prevent freezing.
It also serves as a signal source to drive the circulation pump.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS A water heater according to an embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show cross sections of a water heater according to a first embodiment of the present invention. In the figure, 1 is a cylindrical outer shell, 2 is a cylindrical inner shell, and the upper and lower ends of each are welded together to form a watertight water chamber therebetween, forming a can body. The side surfaces of the water chambers of the inner and outer shells 2 and 1 are enameled. 3 is a pipe body for a heat exchanger that is flat in the vertical direction and whose cross section is in the longitudinal direction, which is provided in the upper part on the high temperature side of the water chamber; 4 is a water supply port that is attached to the upper part of the outer shell 1; 5; is a hot water supply inlet, which is brazed to the pipe body 3 and is electrically insulated from the outer shell 1. Reference numeral 6 indicates a bellows process provided on the circumference of the inner shell 2, and the bellows 6 is eliminated from the tube body 3 section, making it a straight section.

Reference numeral 7 denotes a hot water inlet provided on the upper part of the outer shell 1, and 8 denotes a water inlet, which is provided at a position opposite to the outwardly projecting portion of the bellows 6. A thermistor 9 detects the water temperature in the water chamber and controls combustion, and the thermistor 9 is located below the pipe body 3 and directly above the upper end of the bellows 6. Reference numerals 10 to 13 designate electrodes for electrically corrosion-protecting the can body using an external power source, and four electrodes are provided in the upper and lower portions of the tubular body 3 and in the circumferential direction of the outer shell 1. 14 is a ring-shaped burner ring, 15 is a heating body made of a burner, 16 is a cylindrical auxiliary combustion cylinder, and 17 is a disc-shaped burner base, which form a combustion chamber. Also, burner ring 14 and inner shell 2
The gap between the two is set to be as small as possible to allow assembly.

Reference numeral 18 denotes a baffle plate appropriately installed around the prismatic body shown in FIG. 3, with a chimney 19 at the top and a burner ring 1 at the bottom.
4 is provided with a fixing plate 20 for fixing it. 21 is a blower motor, 22 is a blower fan, and 23 is a blower path, which sends combustion air to the heating element 15. 24 is a pressure pump, 25 is an oil feed pipe, and 26 is a spray nozzle, which atomizes fuel and sends it to the combustion chamber. Next, the circulation circuit will be explained using FIG. 2. 27 is a circulation pump, 28 is a filter case located at the top, 29 is a filter lid for supplementary water and filter cleaning, 30 is a primary filter, 31 is a secondary filter, 32 is a filter case 28 divided into two chambers. The dividing wall, 33 is a packing that blocks the outside air, 40 is a trap wall, 34 is an outgoing connection port, and 35 is a return side connection port, and these and the water supply port 4 and the hot water supply port 5 are connected using rubber pipes. They are connected by a circulation pipe 36 made of a resilient material, forming a circulation circuit that circulates as shown by the arrow.

Further, the outgoing side connection port 34 and the return side connection port 35 are provided in the lower part of the main body 41 which has a can inside. 37 is a thermistor attached to the return side connection port 35, and controls the operation of the circulation pump 27. 38 is a bathtub; 3
Reference numeral 9 denotes external piping that connects the connection ports 34, 35 and the bathtub 38.

The operation of the water heater constructed as described above will be explained below with reference to FIG. 1. First, water is supplied to the water chamber inside the can from the water supply port 8, and when it is full, the water chamber is supplied with water from the water supply port 7.
More leakage. On the other hand, combustion air is sent to the heating element 15 via the air passage 23 by the ventilation fan 22, and on the other hand, fuel is sent to the spray nozzle 26 by the pressure pump 24, enters the combustion chamber in the form of a mist, and mixes with the air. It ignites and burns. The combustion gas is high temperature, and the burner ring 14,
The water is discharged from the chimney 19 through the baffle plate 18, during which time it comes into contact with the inner surface of the inner shell 2 and transfers heat to the water in the water chamber, heating it. The water heated in this way is used for hot water supply.

Next, the operation of the circulation circuit will be explained using FIG. 2. First, a predetermined amount of water is supplied to the bathtub 38 and then to the filter case 28 to fill the circulation pump 27 and the pipe body 3. Next, when the circulation pump 27 is operated, the water in the bathtub 38 is circulated as shown by the arrow due to its suction force. That is, the water circulates in the order of the external pipe 39, return side connection port 35, primary filter 30, water supply port 4, heat exchange pipe body 3, hot water supply port 5, secondary filter 31, circulation pump 27, and output side connection port 34. At this time, since the water in the water chamber is heated and becomes high-temperature water, the circulating water in the bathtub 38 is heated by the tube body 3.

The water in the bathtub 38 is heated in this way. The temperature of the circulating water is detected by the thermistor 37 and the operation of the circulation pump 27 is controlled to control the temperature of the hot water in the bathtub 38. Thereafter, even if the water in the bathtub 38 is drained, water remains in the circulation pump 27 and the pipe body 3 due to the effect of the trap wall 40, and there is no need to supply water to the filter case 28.

[0018]

Effects of the Invention As described above, the present invention forms a can body by forming a water chamber between an outer shell and an inner shell, a heating element is provided in the inner shell, and a can body is provided in the water chamber. The circulation circuit of this heat exchanger consists of a circulation pump, a primary filter, a secondary filter, a pipe body, an outgoing connection port, and a return side connection port equipped with a thermistor for controlling the circulation pump. ,
Moreover, since the return side connection port is provided at the lowest part of the circulation circuit and at the lower part of the main body housing the can, even if the circulation pump is stopped, as long as the pipe remains heated,
Malfunctions can be prevented because the thermistor part is not heated due to the natural convection of hot water in the circulation pipe. In addition, since the part where the thermistor is located is the lowest temperature part in the circulation circuit, it is possible to reliably detect this before the water in any part of the circulation circuit freezes, and the circulation pump can be operated to prevent freezing. This makes it possible to prevent destruction or unusability due to freezing.

[Brief explanation of the drawing]

[Fig. 1] A- in Fig. 3 of a water heater in one embodiment of the present invention.
Vertical cross-sectional configuration diagram along the OA' line

[Figure 2] Vertical cross-sectional view showing details of the piping section in Figure 1

[Figure 3]
Cross-sectional configuration diagram taken along line BB' in Figure 1

[Figure 4] Vertical cross-sectional configuration diagram of a conventional water heater

[Explanation of symbols]

1 Outer body 2 Inner body 3 Pipe body 27 Circulation pump 30 Primary filter 31 Secondary filter 34 Outgoing connection port 35 Return side connection port 36 Circulation pipe 37 Thermistor

Claims (1)

[Claims] Claim 1: A water chamber is formed between an outer shell and an inner shell to form a can body, a heating element is provided within the inner shell, and a heat exchanger formed of a pipe body is provided within the water chamber, The circulation circuit of this heat exchanger includes a circulation pump, primary filter, secondary filter,
It consists of a pipe body, an outgoing side connection port, and a return side connection port equipped with a thermistor for controlling the circulation pump, and the return side connection port is located at the lowest part of the circulation circuit and in the lower part of the main body in which the can body is installed. A water heater with a built-in configuration.