Hot water storage type water heater

Abstract

To provide a hot water storage type water heater with improved heat efficiency.SOLUTION: A hot water storage type water heater comprises: an outer can 1c with a hot water storage chamber 1d formed between itself and an inner can 1b provided inward; a combustion chamber 2 formed in the inner can 1b facing a combustion burner 3; and a plurality of smoke pipes 7 connecting the combustion chamber 2 and an exhaust chamber 6 provided at the top of the outer can 1c through the hot water storage chamber 1d. The combustion gas of the combustion burner 3 is exhausted through the smoke pipes 7 for heat exchange, to heat and supply hot water from the hot water storage chamber 1d. The surface of the smoke pipe 7 comprises a groove 7a that is concave toward the inside of the smoke pipe 7. The grooves 7a are formed continuously along an axial core direction of the smoke pipes 7.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a storage-type hot water heater that constantly stores a predetermined amount of hot water in a tank body and supplies hot water or warm water at a set temperature to a hot water supply location. [Background technology]

[0002] In the past, in this type of One type of hot water heater comprises an outer can with a cylindrical inner can inside, which forms a hot water storage chamber between it and the outer can, a combustion chamber formed within the inner can and facing a combustion burner, and a plurality of smoke pipes that connect this combustion chamber to an exhaust chamber at the top of the outer can through the hot water storage chamber.The combustion burner is turned on and off to maintain the hot water temperature in the hot water storage chamber at a predetermined temperature, and the combustion of the combustion burner and exhaust gases are exhausted through the smoke pipes, and this heat exchange heats the water in the hot water storage chamber supplied from the water supply pipe to produce hot water (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6537864 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for more efficient water heaters, and for the water heater in Patent Document 1, the idea of ​​increasing the number of smoke pipes that perform heat exchange or lengthening the length of the smoke pipes themselves has been considered, but both of these would result in the water heater itself becoming larger, so these were not adopted as solutions. Another option is to apply bulge processing to the smoke pipe to give it a bellows-like surface. However, while this would improve thermal efficiency, it would also create grooves perpendicular to the axial direction of the smoke pipe, which would increase exhaust resistance, put a strain on the combustion burner, and have a greater impact on combustion, potentially leading to problems such as poor combustion. There were also issues with the vertically formed grooves making it easier for soot to accumulate, leaving room for improvement. Another option is to form grooves on the surface of the smoke pipe, forming a spiral tube with these grooves in a spiral shape on the surface of the smoke pipe. However, there is a possibility that the processing of the grooves on the smoke pipe may affect the accuracy of the length dimension of the smoke pipe, so there is room for improvement.

[0005] The present invention has been made in consideration of this background, and aims to provide a storage type water heater that can improve thermal efficiency without increasing the size of the water heater body or the exhaust resistance of the smoke pipe. [Means for solving the problem]

[0006] The present invention has been made to achieve the above-mentioned object, and claim 1 describes a device comprising an outer can which forms a hot water storage chamber between itself and an inner can provided inside, a combustion chamber formed within the inner can facing a combustion burner, and a plurality of smoke pipes which connect the combustion chamber with an exhaust chamber provided at the top of the outer can through the hot water storage chamber, wherein the water in the hot water storage chamber is heated and supplied by heat exchange caused by exhausting combustion gas from the combustion burner through the smoke pipes, and wherein the surface of the smoke pipes is provided with a groove which is concave toward the inside of the smoke pipe, and the grooves are formed continuously along the axial direction of the smoke pipe.

[0007] In claim 2, the grooves are formed in a plurality of linear, continuous grooves along the axial direction of the smoke pipe. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a storage type water heater that can improve thermal efficiency without increasing the size of the water heater body or the exhaust resistance of the smoke pipe. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a first embodiment of the present invention; [Figure 2] 1 is a perspective view of a smoke pipe according to a first embodiment of the present invention; [Figure 3] AA end view of the smoke tube of the first embodiment of the present invention [Figure 4] BB end view of the smoke tube of the first embodiment of the present invention DETAILED DESCRIPTION OF THE INVENTION

[0010] A first embodiment of the present invention will be described with reference to FIGS.

[0011] Reference numeral 1 denotes a small storage-type hot water heater, and reference numeral 1a denotes a body consisting of a cylindrical inner can 1b and an outer can 1c which has a hot water storage chamber 1d formed between it and the inner can 1b, for storing a certain amount of hot water. Reference numeral 2 denotes a combustion chamber formed within the inner can 1b and facing a combustion burner 3. The combustion burner 3 is a combustion burner that heats the can body 1a on and off, and is a gun-type combustion burner that faces the inside of the combustion chamber 2 and functions as a heat source with an ignition electrode 4 and a nozzle 5 integrated together.

[0012] 6 is an exhaust chamber provided at the top of the outer can 1c, 7 is a plurality of smoke pipes that connect the combustion chamber 2 and the exhaust chamber 6 through the hot water storage chamber 1d, and 8 is an exhaust pipe connected to the exhaust chamber 6. Combustion gas generated in the combustion chamber 2 by combustion of the combustion burner 3 is sent from the combustion chamber 2 through the smoke pipe 7 to the exhaust chamber 6 and is then exhausted from the exhaust stack 8. The heat exchange caused by exhausting the combustion gas of the combustion burner 3 through the smoke pipe 7 heats the water in the hot water storage chamber 1d and supplies hot water.

[0013] Reference numeral 9 denotes a water supply port provided on the can body 1a, and 9a denotes a water supply pipe connected to the can body water supply port 9 on one side and to a water pipe on the other side.

[0014] Reference numeral 11 denotes a boiler body outlet connected to the top of the boiler body 1a, and 11a denotes a hot water supply pipe connected to the boiler body outlet 11 on one side and having a hot water tap 11d on the other side.

[0015] Reference numeral 13 denotes a tank body temperature detection means such as a hot water temperature sensor that detects the temperature of the hot water in the tank body 1a.

[0016] Reference numeral 14 denotes a remote controller for issuing operating instructions to the hot water storage type water heater 1, and this remote controller 14 includes an operation switch 15, a hot water temperature setting switch 16, and a display unit 18.

[0017] Reference numeral 20 denotes a control unit having a microcomputer that is communicably connected to the remote control 14 and receives the temperature detected by the can body temperature detection means 13 and signals from the remote control 14 to control the driving of the combustion burner 3 .

[0018] Reference numeral 50 denotes a housing of the storage type hot water heater 1 that houses the can body 1a inside.

[0019] The control unit 20 controls the combustion on and off so as to maintain the temperature of the hot water in the can body 1a at a predetermined temperature set by the user.More specifically, when the temperature detected by the can body temperature detection means 13 falls below a first temperature T1 (combustion on temperature) (e.g., 38°C) which is lower than the set temperature (e.g., 42°C), it turns on the combustion of the combustion burner 3 with fixed combustion capacity, and when the temperature detected by the can body temperature detection means 13 exceeds a second temperature T2 (combustion off temperature) which is the same temperature as the set temperature, it controls the combustion burner 3 to turn off, thereby maintaining the temperature of the hot water in the can body 1a at the set temperature, and the hot water maintained at the set temperature is used for hot water supply.

[0020] In the present invention, grooves 7a are formed on the surface of the smoke tube 7 so as to be recessed toward the inside of the smoke tube 7.

[0021] The groove 7a will now be described in detail. The grooves 7a are formed continuously and linearly along the axial direction 7b of the smoke pipe 7 (the vertical direction in FIG. 2), and a plurality of grooves 7a (for example, eight grooves) are formed per smoke pipe 7. Furthermore, the groove portion 7a is formed in the middle of the smoke pipe 7 except for the upper end flue 7c and the lower end flue 7d, and the apex 7e that protrudes inward of the smoke pipe 7 continues in a straight line without interruption from the upper end 7f of the apex 7e to the lower end 7g.

[0022] The horizontal cross section of the groove 7a is formed in a V-shape as shown in FIG. In other words, the length of the path created when connecting one end 7h of the V-shape, the vertex 7e, and the other end 7j is longer than the length of the arc on the surface of the pipe 7 from one end 7h to the other end 7j.

[0023] Although the horizontal cross section of the groove 7a is formed in a V-shape, it is not limited to this and may be formed in a U-shape or arch shape.

[0024] Next, the operation will be described.

[0025] First, when the user turns on the operation switch 15 on the remote control 14, fuel is sprayed from an external fuel tank (not shown) into the combustion chamber 2 by a fuel pump (not shown), and ignition occurs due to discharge from the ignition electrode 4, and the combustion burner 3 equipped with a combustion fan starts combustion. Then, based on the temperature detected by the can body temperature detection means 13 and the target temperature separately set by the user, the combustion burner 3 performs on / off combustion, heats the temperature of the hot water in the can body 1a to the target set temperature, and enters a standby state in preparation for hot water supply.

[0026] Next, when the user opens the hot water tap 11d, the heated water in the upper part of the boiler body 1a flows through the hot water supply pipe 11a and comes out from the hot water tap 11d.

[0027] In the present invention, a concave groove 7a is formed on the surface of the smoke pipe 7 toward the inside of the smoke pipe 7, so that the surface area of ​​the smoke pipe 7 can be increased compared to when no groove 7a is formed on the surface of the smoke pipe 7, thereby improving the heat exchange efficiency. Furthermore, the grooves 7a are formed continuously in a straight line along the axial direction 7b of the smoke pipe 7 (the vertical direction in Figure 2), and multiple grooves (e.g., eight grooves) are formed per smoke pipe 7.This increases the surface area of ​​the smoke pipe 7 without increasing the exhaust resistance of the smoke pipe 7, improving heat exchange efficiency, and makes it less likely for soot to accumulate than if the surface of the smoke pipe 7 were accordion-shaped, allowing it to be used well for a long period of time.

[0028] In addition, a baffle plate (not shown) may be provided inside the smoke pipe 7 to slow down the flow of combustion gas and improve the efficiency of heat exchange with hot water.In addition to improving the heat exchange efficiency, when combined with a smoke pipe 7 having the groove portion 7a of the present invention, it is much easier to insert the baffle plate into the smoke pipe 7 than with a smoke pipe whose surface is processed into a bellows shape.

[0029] Although the combustion burner 3 has been described as a pressure spray gun burner, other combustion burners may also be used.

[0030] It should be noted that the other configurations used in this embodiment are presented as examples and are not intended to limit the scope of the invention, and the invention can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are also included in the inventions described in the claims and their equivalents. [Explanation of symbols]

[0031] 1: Storage water heater 1b: Inner can 1c: outer can 1d: Hot water storage room 2: Combustion chamber 3: Combustion burner 6: Exhaust chamber 7: Smoke pipe 7a:Groove 7b: Axial direction

Claims

1. an outer can having a hot water storage chamber formed between it and an inner can provided inside; a combustion chamber formed in the inner can and facing a combustion burner; a plurality of smoke pipes that connect the combustion chamber and an exhaust chamber provided at the top of the outer can through the hot water storage chamber; Equipped with In the device for heating and supplying hot water by heat exchange with the combustion gas of the combustion burner exhausted through the smoke pipe, The surface of the smoke tube is provided with a groove portion that is concave toward the inside of the smoke tube, The groove is formed continuously along the axial direction of the smoke pipe. A storage type water heater characterized by the above.

2. The grooves are formed in a linear fashion along the axial direction of the smoke pipe.

2. The hot water storage type water heater according to claim 1.

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