JPH04214146A - Hot-water supplier - Google Patents

Abstract

PURPOSE:To provide a hot-water supplier, excellent in the rise-up performance of circulation, the utilizing property of circulating side hot-water supply and the collection of dust in a circuit. CONSTITUTION:The filter case 28 of the circulating circuit of hot-water is divided by a wall 32, a primary filter 30 and a secondary filter 31 are provided in respective chambers, which are sealed by a filter lid 29 through a packing 33, and the filter case 28 is provided at the uppermost part of the circulating circuit. Accordingly, water is supplied to a circulating pump 27 from the side of the secondary filter 31, upon the initial supplying of water while the water is supplied from the side of the primary filter 30 to the tubular body 3 upon the initial supplying of water respectively and, therefore, the water can be supplied to the most part in the circulating circuit a time necessary for the purge of air in the circulating circuit by the operation of the circulating pump 27 is shortened whereby the rise-up performance of circulation is improved and the using property of the hot-water supplier is improved. On the other hand, the catching capability of dust in water in a bathtub 38 is improved by the primary filter 30 and the secondary filter 31 whereby the elongation of the life of instruments can be contrived.

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 filter is not attached to the circulation circuit formed by the heat exchanger tube and piping in the water chamber, and therefore, there is a possibility that dirt may accumulate in the circulation circuit. This has led to problems such as accumulation, reduction in heat exchange efficiency, reduction in circulation rate, and problems such as clogging.

In view of the above-mentioned problems, the present invention provides a water heater with good circulation start-up performance, usability of circulation hot water supply, and good ability to catch dust in the 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 is provided in the water chamber, a filter case provided in the hot water circulation circuit including the heat exchanger is divided by a wall, and a primary filter and a secondary filter are provided in each chamber, and a The filter case is sealed with a filter lid, and the filter case is provided at the top of the circulation circuit, and a circulation pump is provided in the circulation circuit between the downstream side of the secondary filter and the upstream side of the primary filter. It is something.

[0009]

[Operation] According to the above-described structure, when water is initially supplied to the circulation circuit, water is supplied to the circulation pump from the secondary filter side and to the heat exchanger from the primary filter side, so that most of the water in the circulation circuit is supplied with water. Water will be supplied to Therefore, the time required to drive out the air in the circulation circuit by operating the circulation pump is shortened. In addition, the primary filter and secondary filter catch dust in the circulation circuit.

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. Reference numeral 24 indicates a pressure pump 25, which is an oil feed pipe, and 26, 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.

[0014] Further, the outgoing side connection port 34 and the return side connection port 35 are provided in the lower part of the main body. 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, 39 is a connection port 34, 3
5 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, while fuel is sent to the spray nozzle 26 by the pressurizing pump 24, becomes atomized, enters the combustion chamber, 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 inside of 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 piping 39, return side connection port 35, primary filter 30, water supply port 4, heat exchange pipe 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 water temperature 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 the operation of supplying water to the filter case 28 becomes unnecessary.

[0018]

Effects of the Invention As described above, the present invention forms a water chamber between an outer shell and an inner shell to form a can body, a heating element is provided in the inner shell, and a heat exchanger is provided in the water chamber. The filter case provided in the hot water circulation circuit including this heat exchanger is divided by a wall, a primary filter and a secondary filter are provided in each chamber, and the filter case is sealed with a filter lid via packing, and , since the filter case is installed at the top of the circulation circuit and the circulation pump is installed in the circulation circuit between the downstream side of the secondary filter and the upstream side of the primary filter, at the time of initial water supply, the secondary Water can be supplied from the filter side and the heat exchanger from the primary filter side, respectively, and water can be supplied to most of the circulation circuit. Therefore, the time required to drive out the air in the circulation circuit by operating the circulation pump is shortened, the circulation start-up performance is improved, and the usability is improved.

Furthermore, since the primary filter and the secondary filter form a double filter, the ability to catch dust in the circulation circuit is improved and the life of the equipment can be extended.

[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 28 Filter case 29 Filter lid 30 Primary filter 31 Secondary filter 32 Wall 33 Packing

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 in the inner shell, a heat exchanger is provided in the water chamber, and a heat exchanger is provided in the water chamber. The filter case of the circulation circuit is divided by a wall, a primary filter and a secondary filter are provided in each chamber, and the filter case is sealed with a filter lid via packing, and the filter case is placed at the top of the circulation circuit, and the circulation circuit is A water heater in which a pump is installed in a circulation circuit between the downstream side of the secondary filter and the upstream side of the primary filter.