JPS60216107A - Liquid heating apparatus of pulse combustion type - Google Patents

Abstract

PURPOSE:To enable to improve the thermal efficiency and at the same time, to narrow the space by equipping with fins in the inner side of the outer and performing the thermal exchange of the liquid to be heated and the combustion gas to heat said liquid. CONSTITUTION:As the plural fins 21 for the heat exchange are projected in the inner direction at the inside of outer tube 17, the heat exchange efficiency between the combustion gas flowing in the exhaust gas passage 20 and the liquid to be heated, which has been accommodated in the heating bath 11, can be raised sharply. Further, the outside unit 12 of the combustion apparatus is formed by the exhaust room component 13 and the mixing room component 14. Furthermore, the mixing room 15 is formed in the inside of component 14, and the exhaust room 16 is formed between the component and the component 14, and the outside unit 12 is constituted to be fitted to the side wall 11a of the heating bath 11. Accordingly, the installation work of combustion apparatus become easy and at the same time, the space for installation can be made smaller.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a pulse combustion type liquid heating device that heats a liquid to be heated contained in a container by heat exchange with combustion gas discharged from a combustion chamber of a pulse burner. Regarding.

[Technical background of the invention and its problems] Conventionally, it has been considered to use a pulse combustion device as a heat source for a liquid heating device that heats a liquid to be heated, such as water. FIG. 1 shows a schematic configuration of the main parts of a conventional pulse combustion type liquid heating device, in which 1 is a heating tank (container) containing a liquid to be heated. On one side wall 1a of this heating tank 1, a pulse burner is installed on the inner surface. A mixing chamber 3 connected to the combustion chamber 2 is attached to the outer surface. Further, an exhaust chamber 4 is attached to the other side wall lb of the heating tank 1 (the wall surface opposite to the wall surface to which the combustion chamber 2 and the mixing chamber 3 are attached). A heat exchange section 5 is arranged between the combustion chamber 2 and the exhaust chamber 4. Furthermore, one end of each of an air supply pipe 6 and a fuel supply pipe 7 is connected to the mixing chamber 3. Furthermore, an intake muffler, an air flapper valve, etc. (not shown) are connected to the air supply pipe 6, and a fuel flapper valve (not shown) is connected to the fuel supply pipe 7. Air is supplied into the mixing chamber 3 through an air supply pipe 6, and fuel gas is also supplied through a fuel supply pipe 7. Air and fuel gas are mixed in this mixing chamber 3 and then exploded and burned in the combustion chamber 2. In this case, at the time of startup, a feeder (not shown) is driven and air is supplied to the air supply pipe 6 by this feeder l11tjl, and the air and fuel gas introduced into the mixing chamber 3 are supplied to the air supply pipe 6. The mixture of air and fuel gas is ignited by a spark plug (not shown) and exploded and burned within the combustion chamber 2. Also,
The air flapper valve and the fuel flapper valve are each closed by the explosion pressure of the air-fuel mixture in the combustion chamber 2, and the supply of air and fuel is stopped, and the combustion gas in the combustion chamber 2 is The heat exchanger 5 is connected to the exhaust chamber 4, the exhaust pipe 8, and the like, and is exhausted to the outside. Then, when the internal pressure of the combustion chamber 2 decreases and becomes a negative pressure state due to the exhaust of combustion gas, the air flapper valve and the fuel flapper valve are respectively opened, and air and fuel gas are introduced into the mixing chamber 3 again. The mixture of air and fuel gas mixed in the mixing chamber 3 comes into contact with the high-temperature residual gas remaining in the combustion chamber 2 or the high-temperature inner wall surface of the combustion chamber 2. The mixture is ignited and explosive combustion is performed again, and thereafter, the same operation is performed to repeat the explosive combustion of the air-fuel mixture in the combustion chamber 2 in a pulsed manner.

However, in the conventional structure described above, the heating tank 1
A combustion chamber 2 and a mixing chamber 3 of the pulse burner are disposed on one side wall 1a of the pulse burner. Since the exhaust chambers 4 are attached to the other opposing side wall 1b of the heating tank 1, the exhaust chamber 4 must be attached separately from the combustion chamber 2 and the mixing chamber 3. , there was a problem that the work was troublesome.

Furthermore, since a heat exchange section 5 is disposed between the combustion chamber 2 and the exhaust chamber 4, it will be difficult to install the pulse combustion device if the shape, structure, etc. of the heating tank 1 deviates from the standard. There was a problem. Therefore, the pulse combustion device must be designed according to the shape of the heating 411, W4 construction, etc.
There was a problem that production was troublesome.

Further, as shown in FIG. 2, a folded part 5 that is folded back 360 degrees to a heat exchange part 5 disposed between the combustion chamber 2 and the exhaust chamber 4
It is also possible to arrange the exhaust chamber 4 along with the combustion chamber 2 and the mixing chamber 3 on the common side wall 1a of the heating tank 1 by forming a In addition, there is a problem in that a troublesome work is required to form the folded part 5a, and since the exhaust chamber 4 must be attached to the common side wall 1a of the heating tank 1 separately from the combustion chamber 2 and the mixing chamber 3, a large installation is required. There was also the issue of space requirements.

Furthermore, although some liquid heating devices are configured to use an immersion type electric heater as a heating source, there is a problem in that the cost increases when a large capacity electric heater is used.

[Purpose of the invention]

This invention allows for easier installation work, allows for a relatively narrower installation space, improves thermal efficiency, and increases overall mechanical strength. The object of the present invention is to provide a combustion type liquid heating device.

[Summary of the invention]

This invention is formed by an exhaust chamber component attached to the outer wall surface of a container containing a liquid to be heated, and a mixing chamber component inserted into the exhaust chamber component, and air is supplied to the inside of the mixing chamber component. a mixing chamber for mixing air introduced from a fuel supply channel with fuel introduced from a fuel supply channel; and an external unit in which an exhaust constant is formed between the exhaust chamber component and the mixing chamber component, respectively; A bottomed cylindrical outer cylinder disposed inside the container and having an open end connected to the exhaust chamber, and one front end connected to the mixing chamber and the other open end near the closed end of the outer cylinder. Each of the inner cylinders is provided with an inner cylinder that extends into the outer cylinder and communicates with the inside of the outer cylinder, and forms a combustion chamber in which the air-fuel mixture sent from the mixing chamber is pulse-combusted. It is characterized by protruding heat exchange fins that also serve as support.

(Embodiment of the invention) FIGS. 3 and 4 show an embodiment of the invention. FIG. 3 shows a schematic configuration of the main parts of the pulse combustion type liquid heating device, and 11 is a heating 41 (container) that accommodates a liquid to be heated, such as water. On the side wall 11a of this heating tank 11, an external unit 1 of a pulse combustion device is provided on the outer surface side.
2 is installed. The external unit 12 is formed by an exhaust chamber component 13 having a cylindrical shape with a bottom and the mixing chamber component 14 inserted into the exhaust chamber component 13. Furthermore, a mixing chamber 15. Exhaust chamber component 13 and mixing chamber component 1
4, an exhaust chamber 16 is formed between each of them. Furthermore, an outer cylinder 17 having a bottomed cylindrical shape is disposed inside the heating tank 11 . The open end of this outer cylinder 17 is connected to the exhaust chamber 16, and the closed end of this outer cylinder 17 is connected to the heating 111.
The external unit 12 extends near the side wall 11b opposite to the side wall 11a on which the external unit 12 is attached. Further, an inner cylinder 18 is disposed inside the outer cylinder 17. This inner cylinder 18 is arranged substantially concentrically with the outer cylinder 17, and one open end of this inner cylinder 18 is connected to the mixing chamber 15.
The other open end extends to a position near the closed end of the outer cylinder 17 and communicates with the inside of the outer cylinder 17. Further, a combustion chamber 19 for pulse combustion is formed inside the inner cylinder 18, and an exhaust passage (tail pipe) communicating with the combustion chamber 19 is formed between the inner cylinder 18 and the outer cylinder 17. ) 20 is formed on the inner surface of the outer cylinder 17. Furthermore, as shown in FIG. These fins 21 extend along the axial direction of the outer cylinder 17 from the open end to the vicinity of the closed end of the exhaust passage 2.
They each extend within o.

On the other hand, an air supply pipe 22 and a fuel supply pipe 23 are connected to the mixing chamber 15, respectively. This air supply pipe 2
2 shows an air flapper valve (not shown) and a fuel supply pipe 23.
are connected to a fuel flapper valve (not shown), etc., respectively. At the time of startup, a feed unit (not shown) is driven so that air is supplied into the mixing chamber 15 through the air supply pipe 22 and fuel gas is supplied into the mixing chamber 15 through the fuel supply pipe 23. The mixture of air and fuel mixed in the mixing chamber 15 is ignited by a spark plug (not shown) and is combusted in the combustion chamber 19 of the inner cylinder 18 m times. In this case, the air flapper valve in the air supply pipe 22 and the fuel flapper valve in the fuel supply pipe 23 prevent backflow of combustion gas due to explosion pressure in the combustion chamber 19.

Further, an exhaust pipe 24 is connected to the exhaust chamber 16. The combustion gas in the combustion chamber 19 is introduced from the open end of the inner cylinder 18 into the exhaust passage 20 between the inner cylinder 18 and the outside [17], and is introduced into the exhaust v16 through the inside of this exhaust passage 20. The exhaust gas is further discharged from the exhaust pipe 24 via a decoupler, an exhaust muffler, etc. (not shown).

Further, when the pressure in the combustion chamber 19 decreases due to the discharge of combustion gas and becomes a negative pressure state, the air flapper valve in the air supply pipe 22 and the fuel flapper valve in the fuel supply pipe 23 are respectively opened, and the combustion air and The fuel gas is supplied into the mixing chamber 15 again, and the mixture of air and fuel mixed in the mixing chamber 15 remains in the combustion chamber 19 as a high-temperature residual gas.

Alternatively, it is ignited by contact with the inner wall surface of the combustion chamber 19 in a high temperature state, and explosive combustion occurs again.''After that, the explosive combustion within the combustion chamber 19 is repeated in a pulsed manner by the same operation. There is.

Therefore, in the above structure, the external units 1 to 12 of the pulse combustion Ha are formed by the bottomed cylindrical exhaust chamber component 13 and the mixing chamber component 14 inserted into the exhaust chamber component 13. and this external unit 12b
mixture! A mixing chamber 15 is provided inside the component 14 . Since the exhaust chamber 16 is formed between the exhaust chamber component 13 and the mixing chamber component 14, and the external unit 12 is attached to the side wall 11a of the heating tank 11, which is a so-called single-end type, it is different from the conventional one. There is no need to provide a plurality of mounting sections to the heating tank 11, and the work for mounting the pulse combustion device can be facilitated, and the installation space can be made relatively small. Further, a combustion chamber 19 is formed inside the inner cylinder 18 connected to the mixing chamber 15, and an exhaust passage 20 is formed between the inner cylinder 18 and the outer cylinder 17 which are arranged substantially concentrically. Since this can be used as a tail pipe of a pulse combustion device, it is possible to downsize the entire pulse combustion device. In general, the frequency f of pulse oscillation is determined by the speed of sound being c [m/s] and the length of the tail tube being L [m/s].
Combustion chamber volume is Vc[m31° Tail pipe volume is Vt[rr
t3], and when the cross-sectional area of the tail tube is AT[m2], it is known to be expressed as. Therefore, by making AT equal to the cross-sectional area of the exhaust passage 20 formed between the inner cylinder 18 and the outer cylinder 17, the frequency f of pulse oscillation can be set.

In addition, a plurality of heat exchange fins 21 are provided on the inner surface of the outer cylinder 17.
... is provided to protrude inward, so that the inner cylinder 18
The heat exchange efficiency between the combustion gas flowing in the exhaust passage 20 formed between the outer cylinder 17 and the heated liquid housed in the heating tank 11 can be significantly increased compared to the conventional configuration. . Furthermore, a plurality of heat exchange fins 21 protruding from the inner surface of the outer cylinder 17 extend from the open end side to the exhaust passage 20 near the rJI closed end side along the axial direction of the outer cylinder 17. Since it is extended, the entire inner cylinder 18 can be supported in a substantially uniform state. Therefore, it is possible to increase the support strength of the inner cylinder 18, which is heated to high temperature and become red-hot by the pulse combustion within the combustion chamber 19, and it is possible to increase the mechanical strength of the entire pulse combustion device. Furthermore, each fin 21...
The flow of combustion gas in the exhaust passage 20 can be smoothed by the 9!
Since the concentricity between 18 and the outer cylinder 17 can be maintained reliably, the temperature distribution of the outer cylinder 17 can be made uniform throughout, and the heated liquid contained in the heating lug 111 can be In addition, there is no risk that a part of the outer cylinder 17 will be locally overheated, and the risk of damage to the pulse combustion device due to local overheating can be reduced. Further, since the outer cylinder 17 and the inner cylinder 18 can be manufactured separately, the outer cylinder 17 and the inner cylinder 18 can be manufactured from different materials. Therefore, the fins 21 having a relatively complicated shape can be formed on the inner surface of the outer cylinder 17, and the durability can be further improved by making the inner cylinder 18 from a material such as ceramic. be able to.

This invention is not limited to the above embodiments. For example, as shown in FIG.
1 may function as a part of the tail pipe.

In this case, the length of the exhaust passage 20 formed between the inner cylinder 18 and the outer cylinder 17 can be made relatively short, and the overall size can be reduced. Of course, various other modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

According to this invention, the air is formed by the exhaust chamber component and the mixing V component inserted into the exhaust chamber component, and the air is introduced into the mixing chamber component from the air supply path and the fuel is introduced from the fuel supply path. a mixing chamber for mixing the fuel to be heated; an exhaust chamber is formed between the exhaust chamber component and the mixing chamber component; a bottomed cylindrical outer cylinder disposed inside the container and having an open end connected to the exhaust chamber; Since inner cylinders are provided that extend near the closed end of the outer cylinder and communicate with the inside of the outer cylinder, and form combustion chambers in which the air-fuel mixture fed from the mixing chamber is pulse-combusted, the installation is easy. Not only can the work be made easier, but the installation space can be made relatively narrow.Furthermore, heat exchange fins that also serve as support for the inner cylinder are provided protruding from the inner surface of the outer cylinder, so thermal efficiency can be improved. It is also possible to improve the overall mechanical strength.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views showing the schematic configuration of the main parts of different conventional examples, and FIGS. 3 and 4 show a practical example of the present invention, and FIG. 3 shows the main parts. FIG. 4 is a vertical cross-sectional view showing a schematic configuration of IV-IV m g? of FIG. 3.
The i-plane view and FIG. 5 are longitudinal sectional views of main parts showing another embodiment. 11... Heating tank (container), 12... External unit,
13... Exhaust chamber constituent member, 14... Mixing chamber constituent member, 15... Mixing chamber, 16... Exhaust chamber, 17... Outer cylinder, 18... Inner cylinder, 19... Combustion chamber, 21...fin. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] It is formed by a container that accommodates the liquid to be heated, an exhaust chamber component that is attached to the outer wall of the container, and a mixing chamber component that is inserted into the exhaust chamber component. a mixing chamber for mixing air introduced from the supply path and fuel introduced from the fuel supply path; an external unit having an exhaust chamber formed between the exhaust chamber component and the mixing chamber component; A bottomed cylindrical outer part disposed inside the container and having an open end connected to the exhaust chamber, and one open end connected to the mixing chamber and the other open end extending near the closed end of the outer cylinder. an inner cylinder that is provided and communicates with the inside of the outer cylinder and forms a combustion chamber that performs pulse combustion of the air-fuel mixture sent from the mixing chamber; and an inner cylinder that is provided protruding from the inner surface of the outer cylinder and supports the inner cylinder A pulse combustion liquid heating device characterized by being equipped with fins that also serve as heat exchangers.