JPH09280656A - Boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of a sound from boiling up generated near a burner inlet pipe of a drum, and inhibit the generation of a negative pressure inside the drum. SOLUTION: This boiler is provided with a drum 11 designed to house hot water, a circulation pump 18 which feeds hot water inside the drum 11 to a heat exchanger 20, a burner inlet pipe 13 which fixedly inserts a heating burner into the drum 11 and a bypass pipe 22 and a bypass return opening 24 designed to return hot water from the circulation pump 18 to a water contact area A of the burner inlet pipe and to urge a forced connective flow of the hot water in the water contact area.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a boiler,
In particular, it relates to a boiler suitable for supplying hot water for heat exchange to an external device using a burner.

[0002]

2. Description of the Related Art In recent years, as the quality of the living environment has increased, floor heating and central heating systems that do not pollute indoor air have also been adopted in ordinary households.
This system is a system in which hot water from a heating hot water boiler installed outdoors is supplied to each heat exchanger, and heat is exchanged in the heat exchanger to warm the indoor air. Therefore, according to this system, an unpleasant odor associated with fuel combustion and the generation of carbon monoxide in the room are avoided, and there is an advantage that no complicated air exchange is required. In addition, the use of flooring for floor heating and the like has recently become widespread in order to prevent the reproduction of mites and the like that cause various allergies.

A conventional heating hot water boiler used as an apparatus for implementing the above system is a can body for storing hot water, a circulation pump for sending hot water inside the can body to a heat exchanger side, and a can body. And a burner inlet pipe for inserting and fixing a heating burner therein. In this heating hot water boiler, when the heating operation is instructed by the operation of the remote controller, the heating burner inserted and fixed in the burner inlet pipe is ignited and the circulation pump is started. While the hot water is sent to the heat exchanger side, the hot water deprived of heat by the heat exchanger can be returned to the inside of the can body. In addition, an automatic valve is installed in the middle of the pipe connecting the can body and the heat exchanger, and when this automatic valve operates, the hot water supply from the can body to the heat exchanger is cut off. There is.

[0004]

However, in the conventional hot water heating boiler, the temperature of the water contact area serving as the burner inlet pipe portion rises during the heating operation to locally boil the hot water, which causes Then, there is an inconvenience that a buzzing noise is generated.

Further, when the automatic valve operates, a negative pressure by the circulation pump tends to be generated inside the can body, which may cause the outer case body to buckle. Therefore, conventionally, there is a design restriction that the wall thickness of the can must be increased, and in addition, the boiler is inevitably a heavy structure.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised in view of the disadvantages of the conventional example, and its purpose is to prevent the generation of noise due to bumping which occurs near the burner inlet pipe of the can body. An object of the present invention is to provide a boiler capable of reducing the negative pressure generated by the circulation pump even if the hot water supply is suddenly cut off by an automatic valve or the like provided in the middle of the hot water supply pipe.

[0007]

In order to achieve the above object, the boiler according to the present invention comprises a can body for storing hot water, a circulation pump for sending hot water inside the can body to the outside, and In a boiler having a burner inlet pipe for inserting and fixing a heating burner in a can body, a bypass pipe for returning warm water from the circulation pump to the inside of the can body, and the bypass pipe and the can body A bypass return port for connection is provided. In this configuration, when the circulation pump operates,
The hot water heated in the can is supplied to an external device such as a heat exchanger. Then, the hot water deprived of heat by the heat exchanger is returned to the can body. here,
The warm water returned to the can body via the bypass pipe promotes convection in the can body, and acts to prevent a local temperature rise near the burner inlet pipe. When the hot water supply is cut off by the operation of the automatic valve installed on the pipe connecting the circulation pump and the external device, all the hot water discharged from the circulation pump can be discharged from the bypass return port via the bypass pipe. Since it is returned to the body, the generation of negative pressure inside the can is reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, it is preferable that the bypass return port is arranged at the left and / or right or the lower part of the water contact area of the burner inlet pipe. As a result, hot water convection in a direct region where a local temperature rise occurs can be promoted, and the generation of bumping noise can be effectively suppressed.

It is also preferable that the bypass return port is equipped with a flare nipple with a nozzle and the opening direction of the nozzle is directed to the water contact area of the burner inlet pipe. As a result, heat exchange in the water contact area can be more effectively performed. A flare nipple can be used instead of the flare nipple with a nozzle.

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an overall configuration diagram of an embodiment in which the boiler according to the present invention is applied to a hot water heating system.
FIG. 2 shows a schematic sectional view thereof. In these figures, the boiler 10 is configured to include a can body 11 for storing hot water. A burner inlet tube 13 for inserting and fixing a burner 12 for heating is provided on the outer peripheral portion of the lower portion of the can body 11. A relief pipe 15 is provided on the upper side of the can body 11, and hot water in the can body 11 is circulated in and out of the suction pipe 16 connected to a lower position of the relief pipe 15. The circulation pump 18 of is arranged. In the suction pipe 16, a header 19 is connected to the downstream side of the circulation pump 18, the hot water flow is branched by the header 19, and thus hot water can be supplied to the heat exchanger 20 side as an external device. ing.

In the middle of the header 19, hot water can 1
1 is connected to one end of a bypass pipe 22 configured to return to inside 1. The other end of the bypass pipe 22 is located below the burner inlet pipe 13, that is, the burner inlet pipe 13.
Is connected to a bypass return port 24 provided in the lower part of the water contact area A (see FIG. 3). Bypass return port 2
4 is equipped with a flare nipple 25 and, as shown in FIG. 4, a nozzle 26 directed to the water contact area A.
Is equipped with a flare nipple 25.

Hot water is supplied to the heat exchanger 20 through a supply pipe 30 arranged between the heat exchanger 20 and the heat exchanger 20, and the hot water deprived of heat in the heat exchanger 20 is returned to a return pipe 31 and a return pipe. It is designed to be refluxed into the can body 11 via the mouth 32. Here, the heated air that has undergone heat exchange in the heat exchanger 20 is supplied to a fan convector, a panel convector, a floor heating panel, or the like (not shown).

An automatic valve 3 for controlling ON / OFF of hot water supply to the heat exchanger 20 is provided in the supply pipe 30.
3 are equipped.

Next, the overall operation of the hot water heating system according to this embodiment will be described.

When a heating operation is instructed by operating a remote controller (not shown), it is inserted into the burner inlet pipe 13.
The fixed heating burner 12 is ignited, and at the same time, the circulation pump 18 is started to start circulation of water in the can 11.

When the water in the can body 11 is gradually heated by the heating burner 12, the water in the water contact area A around the burner inlet pipe 13 due to burner combustion and heat transfer and radiant heat from the burner combustion cylinder. Is rapidly heated, and the water on the upper side in the can 11 is warmed by the convection phenomenon of heat.

The circulation pump 18 takes in hot water from the suction pipe 16 provided on the upper portion of the can body 11, and the header 1
Hot water is supplied to the heat exchanger 20 and the bypass pipe 22 via 9 and the supply pipe 30. The air heated by the heat exchange in the heat exchanger 20 is sent to a fan convex or the like to be used for indoor heating, and the hot water deprived of the heat is provided to the upper part of the can body 11 through the return pipe 31. Return port 32
It is returned to the inside of the can body 11.

On the other hand, the hot water sent to the bypass pipe 22 passes through the bypass return port 24 and the burner inlet pipe 13
Returned to the bottom of. As a result, forced convection occurs in the vicinity of the burner inlet pipe 13, heat exchange is smoothly performed in the vicinity of the burner inlet pipe 13, that is, in the water contact area A, and local temperature rise and boiling are suppressed.

A nozzle 26 is attached to the bypass return port 24.
When the attached flare nipple 25 is used, the hot water from the bypass pipe 22 is jetted in one direction toward the water contact area A, so that the forced convection in the vicinity of the burner inlet pipe 13 is further enhanced.

When the automatic valve 33 provided in the middle of the supply pipe 30 is activated to stop the supply of hot water to the heat exchanger 20, all the hot water from the circulation pump 18 is passed through the bypass pipe 22. Since it is returned to the inside of the can 11, the internal negative pressure of the can 11 that can be generated by the circulation pump 18 is effectively suppressed.

Therefore, according to such a first embodiment,
The hot water supplied through the operation of the circulation pump 18 is returned to the high temperature region of the can body 11 through the bypass pipe 22, and the generation of noise due to bumping can be prevented. Then, as the means for achieving such an effect, since the flare nipple 25 or the flare nipple 27 with the nozzle 26 is only adopted for the bypass return port 24, it can be applied to the existing structure without difficulty. In addition, automatic valve 3
By 3, the generation of negative pressure by the circulation pump 18 can be reduced even if the supply of hot water to the heat exchanger 20 is stopped. Therefore, it is possible to reduce the wall thickness of the can body 11,
It is possible to expect improvement in thermal efficiency, reduction in manufacturing cost, reduction in transportation cost due to weight reduction, and improvement in flexibility in installation and construction.

Although the bypass return port 24 is provided in the lower part of the water contact area A in the above embodiment, the present invention is not limited to this. For example, as shown in FIGS. 4 and 5, the bypass return ports 24 are provided on the left and right of the water contact area A.
The flare nipples 25 may be attached to the respective bypass return ports 24, and the bypass pipes 22 may be connected to the respective flare nipples 25. It is also possible to provide the bypass return port 24 only on either the left side or the right side of the water contact area A.

Although the boiler according to the present invention is applied to the hot water heating system in the above embodiments, the present invention is not limited to this, and the hot water supply system or other hot water heating system is used. It can be used for various systems that can be used.

[0025]

Since the present invention is constructed and operates as described above, according to this, it is possible to prevent overheating in the vicinity of the burner inlet pipe portion of the can body, and to prevent the generation of noise due to bumping. The negative pressure generated when the hot water supply to the heat exchanger is stopped by an automatic valve etc. can be suppressed, buckling of the outer casing of the can can be prevented, and the thickness of the can can be reduced. It is possible to provide a boiler having an excellent effect that has not been achieved in the past.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment in which a boiler according to the present invention is applied to a hot water heating system.

FIG. 2 is a schematic cross-sectional view of the system in the above embodiment.

FIG. 3 is an explanatory view of a main part of the embodiment.

FIG. 4 is a schematic configuration diagram when a flare nipple with a nozzle is adopted.

FIG. 5 is an overall configuration diagram similar to FIG. 1 showing a modified example of the embodiment.

FIG. 6 is an explanatory view of a main part similar to FIG. 3 in the modified example.

[Explanation of symbols]

10 ... Boiler, 11 ... Can body, 12 ... Heating burner, 13 ... Burner inlet pipe, 18 ... Circulation pump, 20 ... Heat exchanger as external equipment, 22 ...・
・ Bypass pipe, 24 ... Bypass return port, 25 ...
Flare nipple, 26 ... Nozzle, A ... Water contact area

Claims (4)

[Claims] 1. A boiler provided with a can body for storing hot water, a circulation pump for supplying the warm water inside the can body to the outside, and a burner inlet pipe for inserting and fixing a heating burner in the can body, A boiler provided with a bypass pipe for returning hot water from the circulation pump to the inside of the can body, and a bypass return port for connecting the bypass pipe and the can body. 2. The boiler according to claim 1, wherein the bypass return port is disposed on the left and / or right or the lower part of the water contact area of the burner inlet pipe. 3. The bypass return port is equipped with a flare nipple with a nozzle, and the opening of the nozzle is directed to the water contact area of the burner inlet pipe. boiler. 4. The boiler according to claim 1, wherein the bypass return port is equipped with a flare nipple.