JP3823456B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus that uses heat of a hot gas generated by combustion using a heat exchanger.
[0002]
[Prior art]
In a heat exchanger that uses heat by exchanging heat with the high-temperature combustion gas generated by conventional combustion, the dew point is the temperature of the combustion gas heat-exchanged in the heat exchanger in order to prevent condensation of moisture generated by the combustion reaction. It was set above the temperature. A combustion apparatus of this type is described in Japanese Patent Laid-Open No. 5-302712. As shown in FIG. 8, this combustion apparatus sends fuel to the burner 1, burns it in the combustion chamber 2, passes through the heat exchanger 3, and discharges it from the exhaust port 4. Combustion air is supplied to the combustion chamber 2 by a combustion blower 5, heat exchange air is passed to the heat exchanger 3 by a convection blower 6, and a temperature detector 7 is provided in the exhaust path.
[0003]
When the temperature detector 7 for detecting the exhaust temperature detects a low temperature, the convection blower 6 is stopped to reduce the heat exchange air and reduce the amount of heat exchange in the heat exchanger 3. By increasing the number of revolutions slightly more than usual, the combustion air is increased to reduce the dew point temperature in the exhaust gas and prevent condensation.
[0004]
[Problems to be solved by the invention]
In the configuration of the conventional combustion apparatus described above, when the exhaust gas temperature becomes low, the convection blower 6 is stopped to reduce heat exchange air, and the heat exchange amount in the heat exchanger 3 is reduced to increase the exhaust gas temperature to prevent dew condensation. Therefore, the amount of heat that can be used through heat exchange decreases. For this reason, the use malfunction and thermal efficiency fall by the shortage of heat occurred. Further, by increasing the rotational speed of the combustion blower 5 slightly more than usual, the combustion air is increased to reduce the dew point temperature in the exhaust gas, thereby preventing condensation. Increasing the amount of combustion air requires more fuel because the temperature of the exhaust gas passing through the heat exchanger 3 decreases and the amount of exhaust gas increases, so the heat exchange efficiency in the heat exchanger 3 decreases. There was a problem.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a combustion chamber provided with a burner and heat transfer fins, a combustion gas discharge passage provided in communication with the combustion chamber, a heat exchanger provided in the combustion gas discharge passage, The combustion gas discharge passage is configured as an upward gradient, and the heat exchanger is configured in the upward gradient portion, and a trap portion is configured in the combustion gas exhaust passage between the combustion chamber and the heat exchanger, A water-absorbing material is disposed in the trap portion, and a part of the water-absorbing material faces the inside of the combustion gas passage and the other part faces the outside of the combustion gas discharge passage .
[0006]
According to the present invention, the high-temperature combustion gas generated by the combustion is subjected to heat exchange in the heat exchanger, and moisture condensed in the combustion gas discharge passage is exposed to the inside of the combustion gas discharge passage due to the low temperature of the exhaust combustion gas. The water absorption material absorbs the water, and the absorbed water is discharged from the water absorption material portion facing the outside of the combustion gas discharge passage. For this reason, heat exchange can be performed with high efficiency without closing the combustion gas discharge passage due to the condensation of the exhaust gas.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be implemented in the form described in each claim. As in claim 1, a combustion chamber provided with a burner and heat transfer fins, a combustion gas discharge passage provided in communication with the combustion chamber, The heat exchanger provided in the combustion gas discharge passage and the combustion gas discharge passage are configured in an upward gradient, and the heat exchanger is configured in the upward gradient portion, and between the combustion chamber and the heat exchanger. A trap portion is formed in the combustion gas discharge passage, and a water-absorbing material is disposed in the trap portion, and a part of the water-absorbing material faces the inside of the combustion gas passage and the other portion is the combustion gas. It is configured to face the outside of the discharge passage . For this reason, heat exchange can be performed with high efficiency without closing the combustion gas discharge passage due to the condensation of the exhaust gas.
[0008]
Further, provided the trap portion to the combustion gas discharge passage between the combustion chamber and the heat exchanger, by the trap portion to dispose the water absorbing material, condensation moisture in the exhaust gas is set to the trap portion, It is easy to discharge to the outside of the combustion gas discharge passage by the water absorbing material.
[0009]
Further, by forming the slope up to the combustion gas discharge passage, rapidly flowing along the slope of moisture in the exhaust gas condensation in the combustion gas discharge passage from the combustion gas discharge passage, so that the accumulated water-absorbing material . For this reason, it can discharge | release to the exterior of a combustion gas discharge channel with a water absorbing material. And since the heat exchanger is configured in this upward gradient portion, all the combustion gas discharge passages extending from the heat exchanger portion of the combustion gas discharge passage where the exhaust gas is condensed and moisture is generated to the portion where the water-absorbing material exists are all inclined upward. Thus, the combustion gas discharge passage is not blocked by condensed water.
[0010]
According to the second aspect of the present invention, the water-absorbing material is subjected to a hydrophilic treatment , and a wick is provided in the combustion gas discharge passage, whereby moisture of the exhaust gas condensed in the combustion gas discharge passage is absorbed by the wick. The wick and a part of the water-absorbing material are close to each other, and the condensed water absorbed in the wick flows from the wick to the water-absorbing material and is released to the outside of the combustion gas discharge passage by the water-absorbing material. Regardless of the gradient of the discharge passage, moisture can flow through the water-absorbing material, so that the degree of freedom of configuration can be increased and the combustion gas discharge passage can be prevented from being blocked by condensed water, resulting in a highly reliable system.
[0011]
Further, since the water-absorbing material is subjected to a hydrophilic treatment, the water-absorbing performance per unit of the water-absorbing material is increased, and moisture condensed from the exhaust gas can be quickly absorbed into the water-absorbing material from the combustion gas discharge passage.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. 1 to 7, the same components as those in the conventional example shown in FIG. 8 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0013]
Example 1
FIG. 1 is a cross-sectional view showing a combustion apparatus in Embodiment 1 of the present invention.
[0014]
Reference numeral 1 is a burner provided in the combustion chamber 2, and 8 is a combustion gas discharge passage provided in communication with the combustion chamber 2, which is in communication with the exhaust port 4. The combustion gas discharge passage 8 is provided with a heat exchanger 9, and at least a part of the combustion gas discharge passage 8 is composed of a sheet of glass fiber, foamable metal or the like or a water-absorbing material 10 of a molding material. This water-absorbing material 10 is configured such that a part thereof faces the inside of the combustion gas passage 8 and the other part faces the outside of the combustion gas discharge passage 8. 11 is a drain pipe provided in the lower part of the water-absorbing material 10, and 12 is a partition such as a wall when the combustion gas discharge passage 8 is installed as a configuration in which the combustion device is installed indoors and the combustion gas is discharged outside the room. It is a member. 13 is a pump for supplying fuel to the burner 1, and 5 is a combustion blower for supplying combustion air. Reference numeral 14 denotes a heat transfer fin, which is configured to promote heat transfer from the combustion chamber 2 with air from the convection blower 6. A water absorbing material 10 may be provided in the combustion gas discharge passage 8.
[0015]
Next, the operation and action will be described. The heat generated by the combustion of the burner 1 is exchanged in the combustion chamber 2 for an amount substantially corresponding to the sensible heat and used for heating the air. Next, the heat exchanger 9 heat-exchanges the latent heat generated by the combustion of the burner 1 that could not be used conventionally. For this reason, the moisture contained in the combustion gas as vapor is liquefied. Since a part of the water-absorbing material 10 faces the inside of the combustion gas discharge passage 8 and a part of the water absorbent material 10 faces the outside of the combustion gas discharge passage 8, the high-temperature combustion gas generated by the burner 1 is passed to the heat exchanger 9. Then, the water that is completely exchanged in heat and condensed in the combustion gas discharge passage when the temperature of the exhaust gas becomes low is absorbed by the water-absorbing material 10 facing the inside of the combustion gas discharge passage 8 and the absorbed water is removed. The water is discharged from the portion of the water absorbent material 10 facing the outside of the combustion gas discharge passage 8 and flows down through the drain pipe 11. For this reason, heat exchange can be performed with high efficiency without causing problems such as blockage of the combustion gas discharge passage 8 due to condensation of exhaust gas. Further, the combustion gas discharge passage 8 from the heat exchanger 9 to the exhaust port 4 can be made low temperature, does not require a heat insulating material, and has high safety. Further, the water-absorbing material 10 easily absorbs water, but if the combustion exhaust gas absorbs water, the water closes the passage so that it becomes difficult to pass through, so that the combustion gas leaks from the water-absorbing material 10 and the heat exchange efficiency in the heat exchanger 9 There is no decline.
[0016]
(Example 2)
FIG. 2 shows a cross section of the combustion apparatus according to the second embodiment. The difference from the first embodiment is that a pipe-shaped heat exchanger 9a and pipe-shaped heat transfer fins 14a are provided. Accordingly, liquid heat exchange can be used instead of air heat exchange.
[0017]
Example 3
FIG. 3 shows a combustion apparatus according to Embodiment 3 of the present invention. The difference from the first embodiment is that a trap portion 15 is provided in the combustion gas discharge passage 8 between the combustion chamber 2 and the heat exchanger 9, and the trap portion 15 is formed of a water absorbent material 10. Of course, since the inner surface of the trap part 15 should just be a water absorptive material, you may make it the form which linings a water absorptive material to the trap part which does not absorb water.
[0018]
Next, the operation and action will be described. Moisture condensed from the exhaust gas passes through the combustion gas discharge passage 8, collects in the trap portion 15, and can be discharged to the outside of the combustion gas discharge passage 8 by the water absorbent material 10. For this reason, even if the area of the water absorbent material 10 facing the combustion gas discharge passage 8 is small, the condensed water flows in a concentrated manner, so that the water absorbent material 10 can be downsized.
[0019]
Further, the water-absorbing material 10 is subjected to a hydrophilic treatment such as silicon which has an effect of reducing the surface tension of water. Thereby, the water absorption performance per unit of the water absorbent material 10 can be increased, and moisture condensed from the exhaust gas can be quickly absorbed into the water absorbent material 10 from the combustion gas discharge passage 8. The fact that moisture can be quickly discharged from the combustion gas discharge passage 8 can ensure the passage area of the combustion gas discharge passage 8 stably and always, and can ensure reliability without causing combustion failure due to an increase in exhaust resistance.
[0020]
Example 4
FIG. 4 shows a combustion apparatus according to Embodiment 4 of the present invention. The difference from the first embodiment is that the combustion gas discharge passage 8 is configured to have a rising slope.
[0021]
Next, the operation and action will be described. Moisture of the exhaust gas condensed in the combustion gas discharge passage 8 flows quickly from the combustion gas discharge passage 8 along the gradient and accumulates in the water absorbent material 10. For this reason, the water absorbent material 10 can completely discharge the combustion gas discharge passage 8 to the outside. Further, since the heat exchanger 9 is configured in this upward slope portion, all of the combustion gas discharge passage 8 from the heat exchanger 9 portion of the combustion gas discharge passage 8 where the exhaust gas is condensed and moisture is generated to the water absorbent material 10 is formed. Ascending slope is obtained, and the combustion gas discharge passage 8 is not blocked by the condensed water. Further, since all the moisture generated by heat exchange of the latent heat of the combustion gas flows from the heat exchanger 8 to the water absorbent material 10 along the gradient, the moisture is passed through the combustion gas discharge passage 8 from the heat exchanger 9 to the exhaust port 4. Since it does not accumulate, it can be designed freely according to installation, and the combustion gas discharge passage 8 from the heat exchanger 9 to the exhaust port 4 can be made low temperature. Is high.
[0022]
(Example 5)
FIG. 5 shows a combustion apparatus according to Embodiment 5 of the present invention. The difference from the first embodiment is that the water absorbing material 10 and the inner wall member 16 of the combustion chamber 2 are arranged close to each other.
[0023]
Next, the operation and action will be described. The water-absorbing material 10 receives heat from the inner wall member 16 of the combustion chamber 2 that is at a high temperature due to combustion of the burner 1. For this reason, the water-absorbing material 10 becomes high temperature, and the moisture of the absorbed combustion gas evaporates with this heat and can be discharged to the outside with steam. This eliminates the need for drain piping, reduces the number of components and realizes an inexpensive device, and allows for freedom and ease of installation.
[0024]
(Example 6)
FIG. 6 shows a combustion apparatus according to Embodiment 6 of the present invention. The difference from the first embodiment is that a wick 17 is provided in the combustion gas discharge passage 8, so that moisture of the exhaust gas condensed in the combustion gas discharge passage 8 is absorbed by the wick 17. The wick 17 and a part of the water-absorbing material 10 are configured close to each other.
[0025]
Next, the operation and action will be described. The condensed water absorbed in the wick 17 flows from the wick 17 to the water absorbent material 10 and is released to the outside of the combustion gas discharge passage 8 by the water absorbent material 10. Regardless of the gradient, moisture can be passed through the water-absorbing material 10 and the degree of freedom of configuration can be increased, and the combustion gas discharge passage 8 can be prevented from being clogged with dew condensation water, resulting in a highly reliable system.
[0026]
(Example 7)
FIG. 7 shows a combustion apparatus according to Embodiment 7 of the present invention. The difference from the first embodiment is that the combustion gas discharge passage 8 is made of a material having a large surface area such as a resin having a good thermal conductivity, a thin metal tube such as aluminum, or a corrugate.
[0027]
Next, the operation and action will be described. The combustion gas discharge passage 8 transfers heat to the outside with high efficiency, and the moisture in the exhaust gas can be condensed without any special heat exchange in the combustion gas discharge passage 8. High reliability can be realized by miniaturization and simplification.
[0028]
【The invention's effect】
According to the present invention described above, there is an effect that it is without a high efficiency heat exchanger in causing problems such as to occlude the combustion gas discharge passage due to condensation of the exhaust gas.
[0029]
Also has a trap portion in the combustion gas discharge passage between the combustion chamber and heat exchanger, since the water-absorbing material in the trap portion are arranged, condensed moisture in the exhaust gas in the trap portion They gather and can be efficiently discharged to the outside of the combustion gas discharge passage by the water absorbing material.
[0030]
Further, since the arrangement to the gradient up to combustion gas discharge passage, the moisture of the exhaust gas condensed in the combustion gas discharge passage is rapidly accumulated in the stream water absorbent material along the slope from the combustion gas discharge passage. For this reason, moisture can be efficiently discharged to the outside of the combustion gas discharge passage by the water absorbing material. And since the heat exchanger is configured in this upward gradient portion, all the combustion gas discharge passages from the heat exchanger portion of the combustion gas discharge passage where the exhaust gas is condensed and moisture is generated to the water-absorbing material have an upward gradient, and the combustion gas There is an effect that the discharge passage is not blocked by the condensed water.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a combustion apparatus according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a combustion apparatus according to a second embodiment of the present invention. 4] Cross-sectional view of the combustion apparatus in the fourth embodiment of the present invention [Fig. 5] Cross-sectional view of the combustion apparatus in the fifth embodiment of the present invention [Figure 6] Cross-sectional view of the combustion apparatus in the sixth embodiment of the present invention [Fig. Sectional view of combustion apparatus in Embodiment 7 of the present invention [FIG. 8] Cross-sectional view of appearance of conventional refrigerant heater [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Burner 2 Combustion chamber 8 Combustion gas discharge passage 9 Heat exchanger 9a Pipe-shaped heat exchanger 10 Water-absorbing material 11 Drain piping 14 Heat transfer fin 14a Pipe-shaped heat transfer fin 15 Trap part 16 Inner wall member 17 Wick

Claims (2)

Combustion chamber provided with a burner and heat transfer fins , a combustion gas discharge passage provided in communication with the combustion chamber, a heat exchanger provided in the combustion gas discharge passage, and the combustion gas discharge passage configured in an upward gradient In addition, the heat exchanger is formed in the rising slope portion, and a trap portion is formed in the combustion gas discharge passage between the combustion chamber and the heat exchanger, and a water absorbing material is disposed in the trap portion. The combustion apparatus wherein a part of the water-absorbing material faces the inside of the combustion gas passage and the other part faces the outside of the combustion gas discharge passage. The combustion apparatus according to claim 1 , wherein the water-absorbing material is subjected to a hydrophilic treatment, a wick is provided in the combustion gas discharge passage, and the wick and a part of the water-absorbing material are close to each other .

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