JP4114465B2 - Burner mounting structure for water heater - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a structure for attaching a burner of a water heater that stores a predetermined amount of hot water in a can body to obtain a stable hot water temperature.
[0002]
[Prior art]
The inner cylinder constituting the combustion chamber is arranged at the lower part of the outer cylinder constituting the cylindrical can body, and a plurality of flue pipes are attached between the inner cylinder top plate and the outer cylinder top plate, It constitutes a heat exchange part with the flue pipe wall and the outer shell top plate as the heat transfer area, and the gap between the inner shell and the outer shell and the inner shell top plate and the outer shell top plate that have a double cylinder structure. There is known a hot water storage type hot water heater in which a hot water storage chamber is formed in between and a combustion flame generated by a burner is blown into the combustion chamber to heat the water stored in the hot water storage chamber.
[0003]
A hot water temperature sensor is attached to the outer body wall constituting the can body, and the burner changes the amount of combustion based on a signal from the hot water temperature sensor to maintain the hot water temperature in the hot water storage chamber at a predetermined temperature. And when the user opens the faucet, the hot water stored in the hot water storage chamber is discharged first, and when the cold water is sent to the hot water storage chamber and the hot water temperature falls, the hot water temperature sensor detects and issues a combustion command to the burner. In addition, since the heat transfer area of the heat exchange part is large and the temperature of the hot water can rise quickly, hot water supply with almost no temperature unevenness of the hot water is possible.
[0004]
In addition, the burner attached to the combustion chamber of such a hot water storage type water heater is generally installed on the side of the combustion chamber for ease of maintenance. A penetrating burner mounting cylinder is provided, the burner mounted on the burner mounting cylinder is inserted into the combustion chamber, and flame is blown into the combustion chamber from the tip of the blower cylinder.
[0005]
With the above can body shape, the flow of hot water tends to stagnate between the wide hot water storage part between the inner trunk top plate and the outer trunk top plate and the narrow hot water storage part between the inner trunk and the outer trunk, and the combustion chamber If the flow of hot water in the part in contact with the inner body wall that constitutes the water becomes poor, it may cause partial boiling, and such heat exchange failure not only deteriorates the stability of the hot water temperature, but also causes thermal distortion in the can body, Troubles such as perforations and cracks may occur.
[0006]
In particular, turbulent flow tends to occur in the flow of hot water around the burner mounting cylinder attached through the inner and outer cylinders, and boiling of the hot water occurs at the portion in contact with the periphery of the burner mounting cylinder heated directly by the burner. I found it easy.
[0007]
As a countermeasure, the applicant has proposed a structure in which a refractory material is attached to the side surface of the inner cylinder constituting the combustion chamber around the burner mounting cylinder, and the burner mounting cylinder is inserted into the opening provided in the refractory material. By deteriorating the thermal efficiency around the mounting cylinder, partial boiling can be prevented even if the flow of hot water in contact with the burner mounting cylinder is poor (see Patent Document 1).
[0008]
[Patent Document 1]
JP-A-8-75257.
[0009]
[Problems to be solved by the invention]
However, in the structure using refractory material, the refractory material prepared as a separate part is attached inside the can body, or the refractory material is directly adhered to the can body using a ceramic material. In addition, since there is an increase in manufacturing processes and spray equipment, there remains room for improvement in terms of productivity and cost reduction.
[0010]
[Means for Solving the Problems]
The present invention solves the above-mentioned problems, and a cylindrical outer cylinder 2 is attached to the outside of the cylindrical inner cylinder 1, a combustion chamber 3 is formed in the inner space of the inner cylinder 1, and a double cylinder structure. A hot water storage chamber 4 is formed between the inner cylinder 1 and the outer cylinder 2, and a hot water can body 5 is constituted by the hot water storage chamber 4, and the can body 5 has an outer body 2 extending outwardly from the inner body 1. A burner mounting cylinder 6 is provided, a burner 7 is installed at the end of the burner mounting cylinder 6, and a blower cylinder 8 for sending combustion air to the burner 7 and the combustion chamber 3 is extended into the burner mounting cylinder 6. In the water heater in which the combustion cylinder 9 is provided in the blower cylinder 8 and the flame is blown into the combustion chamber 3 from the blower cylinder 8, the outer periphery of the blower cylinder 8 is surrounded between the burner mounting cylinder 6 and the blower cylinder 8. A cylindrical heat shield member 10 is attached to the blow tube 8 and a part of the combustion air flowing through the blow tube 8 is placed on the wall of the blow tube 8. It is provided with a communicating hole 8a to send to the space A.
[0011]
In addition, the tip of the cylindrical heat shield member 10 is connected to the tip of the blower cylinder 8 to form a space A that seals the front and opens the rear, so that the air that has passed through the communication hole 8a is in the space A. Since it discharges, mixing with the air which became high temperature, the temperature nonuniformity of the ventilation cylinder 8 can be prevented now.
[0012]
Further, the tip of the cylindrical heat shield member 10 is connected to the tip of the blower cylinder 8 to form a space A that seals the front and opens the rear, and the communication hole 8 a is near the tip of the blower cylinder 8. In the arrangement, the air in the space A can be mixed and discharged smoothly.
[0013]
[Action]
When combustion air is sent from the blower cylinder 8 into the burner 7 and the combustion cylinder 9 and combustion of the burner 7 is started, the flame formed in the combustion cylinder 9 enters the combustion chamber 3 from the tip of the burner mounting cylinder 6 together with the combustion gas. The water in the hot water storage chamber 4 constituted by the gap between the inner cylinder 1 and the outer cylinder 2 is boiled to a predetermined temperature.
[0014]
During combustion of the burner 7, the wall of the inner cylinder 1 and the burner mounting cylinder 6 constituting the combustion chamber 3 are heated to heat the water in the hot water storage chamber 4, but the portion that contacts the inner cylinder 1 and the burner mounting cylinder 6. If the flow of hot water deteriorates, it may be partially boiled, and especially in the vicinity of the burner mounting cylinder 6 that is mounted through the inner cylinder 1 and the outer cylinder 2, turbulence tends to occur in the hot water flow. It is easy to happen.
[0015]
In the present invention, the cylindrical heat shield member 10 attached so as to surround the outer periphery of the blower cylinder 8 blocks the heat radiation from the blower cylinder 8, and the combustion flows in the blower cylinder 8 from the communication hole 8 a provided in the wall of the blower cylinder 8. By causing a part of the air to flow into the space A between the blower cylinder 8 and the heat shield member 10, the air in the space A that becomes a high temperature due to the heat radiation of the blower cylinder 8 is discharged to prevent the temperature rise of the heat shield member 10. Therefore, the burner mounting cylinder 6 is not directly heated by the heat of the burner 7, and the hot water can be maintained at a low temperature even if the flow of hot water in the portion in contact with the periphery of the burner mounting cylinder 6 deteriorates. .
[0016]
Further, if the space A is configured such that the front end of the heat shield member 10 is connected to the front end of the blow tube 8 to seal the front and open the rear, in the space A, the air passing through the communication hole 8a and the high-temperature air are Mixing becomes easy, the temperature of the space A becomes uniform, and the entire burner mounting cylinder 6 is easily maintained at a low temperature.
[0017]
Furthermore, since the air mixed in the space A flows smoothly by providing the communication hole 8a in the vicinity of the front where the blower cylinder 8 and the heat shield member 10 are connected, the air that has become hot in the space A is efficiently discharged. It became a thing.
[0018]
【Example】
The present invention will be described with reference to the drawings showing embodiments. 3 is a combustion chamber for burning fuel, 1 is an inner cylinder forming the combustion chamber 3, 2 is an outer cylinder disposed on the outer periphery of the inner cylinder 1 with a gap, 5 Is a can body formed of a double cylinder structure by an inner cylinder 1 and an outer cylinder 2.
[0019]
6 is a burner mounting cylinder attached through the inner cylinder 1 and the outer cylinder 2, 7 is a burner mounted at the end of the burner mounting cylinder 6 located on the side surface of the can 5, and 11 is the combustion air to the burner 7. A combustion fan to be supplied, 8 is a blower cylinder extended into the burner mounting cylinder 6 to which combustion air from the combustion fan 11 is sent, and 9 is a combustion cylinder disposed in the blower cylinder 8. The combustion air is sent to 8 and the flame formed in the combustion cylinder 9 is blown into the combustion chamber 3 from the tip of the burner mounting cylinder 6 together with the combustion gas.
[0020]
1a is an inner shell top plate that seals the upper portion of the inner shell 1, 2a is an outer shell top plate having an outer peripheral edge fixed to the upper end of the outer shell 2, and 12 is between the inner shell top plate 1a and the outer shell top plate 2a. The provided flue pipe, 13 is an exhaust chamber provided adjacent to the upper surface of the outer shell top plate 2a, 14 is an exhaust pipe connected to the exhaust chamber 13, and the combustion gas in the combustion chamber 3 passes through the flue pipe 12. Are sent to the exhaust chamber 13 and exhausted from the exhaust cylinder 14 to the outside.
[0021]
4 is a hot water storage chamber formed by a gap between the inner trunk top plate 1 a and the outer trunk top plate 2 a and a gap between the inner trunk 1 wall and the outer trunk 2 wall, and 15 is a water supply pipe opened at the lower portion of the outer trunk 2. , 16 is a hot water pipe opened at the upper part of the outer body 2. When a faucet (not shown) is opened, tap water sent from the water supply pipe 15 is reduced to a predetermined water pressure by a pressure reducing valve and sent into the hot water storage chamber 4.
[0022]
Reference numeral 17 denotes a hot water temperature sensor attached to the wall of the outer body 1 between the hot water supply pipe 14 and the hot water discharge pipe 16. When the water temperature in the water chamber 4 is detected by the hot water temperature sensor 17 and below the set hot water temperature is detected. Gives a combustion command to the burner 7 to boil the water stored in the hot water storage chamber 4 to a specified temperature.
[0023]
When the faucet is opened, hot water heated in the hot water storage chamber 4 is sent out from the hot water discharge pipe 16, and cold water flows into the hot water storage chamber 4 from the hot water supply pipe 15, and the hot water temperature sensor 17 detects this and detects it in the burner 7. A combustion command is issued.
[0024]
Thus, when the faucet is opened, warm water heated to a predetermined temperature is supplied first, so that the rising temperature characteristics are good, and the heat exchanging section has the inner body 1 wall, the flue pipe 12 wall, and the outer body sky. Since it is comprised with the board 2a, the heat-transfer area is large, and since the hot water temperature in the can 5 can rise quickly, the stable hot-water supply temperature can be obtained without extreme temperature unevenness.
[0025]
However, in the above structure, the flow of hot water tends to stagnate between the hot water storage part where the gap between the inner cylinder 1 and the outer cylinder 2 is narrow and the wide hot water storage part between the inner trunk top plate 1a and the outer trunk top plate 2a. If the flow of hot water in the part that contacts the inner cylinder 1 constituting the combustion chamber 3 becomes worse, it will partially boil and generate a high-pitched sound, causing noise troubles, Serious troubles such as opening could occur. In particular, turbulent flow is likely to occur in the hot water flow around the burner mounting cylinder 6 attached through the inner cylinder 1 and the outer cylinder 2, and partial boiling is often performed around the burner mounting cylinder 6.
[0026]
The present invention solves the above-mentioned problem. Reference numeral 10 denotes a cylindrical heat shield member attached so as to surround the outer periphery of the blower cylinder 8, and A denotes a space formed by the interval between the heat shield member 10 and the blower cylinder 8. Yes, the heat shield member 10 blocks heat dissipation from the blower cylinder 8 so that the burner mounting cylinder 6 is not directly heated during combustion of the burner 7.
[0027]
8 a is a plurality of communication holes provided in the wall of the blow cylinder 8 that communicates the inside of the blow cylinder 8 and the space A, and the air in the space A becomes hot due to the heat radiation of the blow cylinder 8, but the combustion air flowing in the blow cylinder 8 Is sent to the space A from the communication hole 8a to discharge high-temperature air to the combustion chamber 3, so that the temperature rise in the space A is suppressed and the heat shield member 10 maintains a low temperature.
[0028]
For this reason, since the temperature rise of the burner mounting cylinder 6 is suppressed, even if the flow of hot water around the burner mounting cylinder 6 deteriorates, the hot water in the portion in contact with the burner mounting cylinder 6 is not heated, and is partially No more boiling.
[0029]
By the way, if the communication hole 8a is merely provided in the wall of the blower cylinder 8 as a structure for preventing the heating of the burner mounting cylinder 6, the air that has passed through the communication hole 8a may diffuse to cause temperature unevenness in the wall of the blower cylinder 8. In this invention, since the air that has passed through the communication hole 8a flows through the narrow space A between the blower cylinder 8 and the heat shield member 10, it becomes difficult to diffuse. It became easy to maintain the entire cylinder 6 at a low temperature.
[0030]
Further, if the front end portion of the heat shield member 10 is bent inward and connected to the front end of the blow cylinder 8 to form a space A in which the front is blocked and the rear is opened, the air passing through the communication hole 8a is Since the front of the space A is sealed, it cannot flow as it is, and is mixed with the air in the space A that has become hot due to the heat radiation of the blower cylinder 8, and the burner mounting cylinder 6 and the heat shielding member 10 from the rear opening. , The temperature of the space A becomes uniform, and the entire burner mounting cylinder 6 can be maintained at a low temperature without causing uneven temperature of the blower cylinder 8.
[0031]
Further, in another embodiment shown in FIG. 3, the communication hole 8 a is opened near the tip of the wall of the blow cylinder 8 to which the heat shield member 10 is connected, and the air passing through the communication hole 8 a is radiated from the blow cylinder 8. The air flows toward the rear opening while mixing with the air in the space A, which has become high temperature, and flows through the gap between the burner mounting cylinder 6 and the heat shield member 10 and is discharged into the combustion chamber 3. A flow is formed, and air that becomes high temperature can be efficiently discharged.
[0032]
In addition, with this configuration, the heat shield member 10 can be simply constructed by attaching the heat shield member 10 to the blow tube 8, and the heat shield member 10 can be handled as an integral part of the blow tube 8; There was almost no change in the process, and it could be realized at low cost.
[0033]
【The invention's effect】
As described above, according to the present invention, the burner mounting cylinder 6 is not directly heated by blocking the heat radiation from the blower cylinder 8 by the heat shield member 10 during the combustion of the burner 7, and the combustion air flowing through the blower cylinder 8. Is sent into the space A from the communication hole 8a, and the air in the space A that becomes high temperature is discharged by the heat radiation from the blower cylinder 8, so that the temperature rise in the space A is suppressed and the burner mounting cylinder 6 is surely secured. It can be maintained at a low temperature, and even if the flow of hot water in the part in contact with the periphery of the burner mounting cylinder 6 deteriorates, it does not cause partial boiling, causing problems such as perforation and noise in the can 5 The fear of making it disappeared.
[0034]
In addition, by connecting the front end of the heat shield member 10 to the front end of the blower cylinder 8 to form a space A that is sealed forward and opened rearward, the air that has passed through the communication hole 8a is mixed with high-temperature air in the space A. However, since it is discharged from the rear opening and sent to the combustion chamber 3, the temperature of the space A is made uniform, and temperature unevenness does not occur in the blower cylinder 8 and the heat shield member 10. It became easy to maintain at a low temperature.
[0035]
Furthermore, by opening the communication hole 8a in the vicinity of the tip of the blow tube 8 connected to the heat shield member 10, the air flow in the space A becomes smooth, and the hot air can be efficiently discharged into the combustion chamber 3. Thus, the burner mounting cylinder 6 can be reliably maintained at a low temperature.
[0036]
Further, since the heat shield member 10 for forming the space A can be provided integrally with the blower cylinder 8, there is no need for special equipment such as when a refractory material is used, and there is almost no change in the assembly process. Since it can be done, it has become simple and inexpensive.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a water heater showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a burner mounting portion of a water heater showing an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a burner mounting portion of a water heater showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Combustion chamber 4 Hot water storage chamber 5 Can body 6 Burner mounting cylinder 7 Burner 8 Blower cylinder 8a Communication hole 9 Combustion cylinder 10 Heat shield member A Space

Claims (3)

A cylindrical outer cylinder 2 is attached to the outside of the cylindrical inner cylinder 1, a combustion chamber 3 is formed in the inner space of the inner cylinder 1, and a double cylinder structure is formed between the inner cylinder 1 and the outer cylinder 2. The hot water storage chamber 4 is formed in the hot water storage chamber 4 and the hot water storage chamber 4 forms a hot water can body 5. The can body 5 is provided with a burner mounting cylinder 6 penetrating from the inner body 1 to the outer side of the outer body 2. A burner 7 is installed at the end of the cylinder 6, and a blower cylinder 8 for sending combustion air to the burner 7 and the combustion chamber 3 is extended into the burner mounting cylinder 6, and a combustion cylinder 9 is provided in the blower cylinder 8, In the water heater that blows flame into the combustion chamber 3 from the blower cylinder 8,
A cylindrical heat shield member 10 is attached between the burner mounting cylinder 6 and the blower cylinder 8 so as to surround the outer periphery of the blower cylinder 8, and one of the combustion air flowing through the blower cylinder 8 is attached to the wall of the blower cylinder 8. A burner mounting structure for a hot water heater, characterized in that a communication hole 8 a is provided to send the portion to the space A between the blower cylinder 8 and the heat shield member 10. The hot water burner mounting structure according to claim 1, wherein a tip of the tubular heat shield member (10) is connected to a tip of the blow tube (8) to form a space (A) in which the front is closed and the rear is opened. . The front end of the tubular heat shield member 10 is connected to the front end of the blower cylinder 8 to form a space A that seals the front and opens the rear, and the communication hole 8 a is disposed near the front end of the blower cylinder 8. The burner mounting structure for a hot water heater according to claim 1.

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