JP5785113B2 - Heat exchanger with combustor for fluid heating - Google Patents

Description

  The present invention relates to a heat exchanger with a combustor for fluid heating, and more particularly, to a heat exchanger with a combustor for fluid heating that is small and has high thermal efficiency for heating fluid such as water, oil, and air.

  Conventionally, various apparatuses for heating a fluid such as water have been proposed. For example, Patent Documents 1 and 2 disclose a fluid heating apparatus that heats water in a water tank by blowing high-temperature combustion gas generated by a burner into a combustion gas passage or a smoke pipe disposed in the water tank. Yes. However, in these fluid heating devices, apart from the burner that generates combustion gas, a combustion gas passage or a smoke pipe that functions as a heat exchanger must be arranged in the water tank, and the device is complicated and large. There is an inconvenience that it becomes. In addition, the heat transfer efficiency from the combustion gas passing through the combustion gas passage or the smoke pipe to the water in the water tank is not so high, and the combustion gas generated by the burner still has a sufficient amount of heat from the exhaust port to the outside. Since it was discharged, there was a drawback that efficient heating could not be performed.

  For this reason, in Patent Document 3, for example, an all-primary premixed forced combustion burner is used, and the combustion gas generated from the burner is provided in the water tank from a large number of outlets provided in a jet body arranged in the water tank. It has been proposed to increase the heat transfer coefficient by ejecting the heat absorbing surface. Moreover, in patent document 4, while the bottom face of a water tank is directly heated with a burner, the combustion gas of a burner is guide | induced to the jet body standing in the water tank, and it provides in a water tank from many jet nozzles provided in the jet body. It has been proposed to improve heat transfer performance by ejecting the heated surface.

  However, all of these fluid heating devices require installation of a jet body with a large number of jet nozzles in the water tank, which makes the structure complicated and large-scale, and has a very high heat transfer efficiency. There is an inconvenience that cannot be obtained.

JP-A-6-221675 JP 10-325603 A JP 2000-257852 A JP 2005-69614 A

  The present invention was made in order to eliminate the drawbacks of the conventional fluid heating apparatus described above, and does not require large-scale equipment such as a combustion gas passage or a smoke pipe, and is simple in structure, small in size, and excellent in heat transfer efficiency. It is an object to provide an apparatus.

  As a result of intensive research and trial and error in order to solve the above-mentioned problems, the present inventors usually use a combustion gas passage such as a smoke pipe installed in a fluid container that accommodates a heated fluid as a heat transfer tube. Are disposed outside the combustor, and a heat conductor is disposed in a combustion gas passage formed between the heat transfer tube and the combustor, so that the combustion gas generated by the combustor can be reduced. It is possible to efficiently transfer the heat it has to the heat transfer tube via the heat conductor, and it is possible to obtain a fluid heating device with a simple structure, a small size, and good heat transfer efficiency without requiring large-scale equipment. As a result, the present invention has been completed.

  That is, the present invention includes a heat transfer tube having a distal end closed, an opening at a proximal end, and a combustion gas exhaust port between the distal end and the proximal end; A combustor that discharges gas from a distal end portion that is open, and is attached to the heat transfer tube with at least its distal end portion inserted into the heat transfer tube from the opening of the proximal end portion of the heat transfer tube. A combustor that forms a combustion gas passage from a tip of the combustor to the combustion gas exhaust port between an outer peripheral surface and an inner peripheral surface of the heat transfer tube; and disposed in the combustion gas passage, the heat transfer tube The above-mentioned problems are solved by providing a heat exchanger with a combustor for fluid heating having one or a plurality of heat conductors in contact with the inner peripheral surface.

  As described above, in the heat exchanger with a combustor for fluid heating of the present invention, a heat transfer tube that forms a combustion gas passage through which the combustion gas generated in the combustor passes is provided outside the combustor, And the combustion gas channel | path is arrange | positioned with the 1 or several heat conductor which contacts the internal peripheral surface of a heat exchanger tube. For this reason, the heat of the combustion gas passing through the combustion gas passage is efficiently transmitted to the heat transfer tube via the heat conductor, and extremely efficient heat transfer is possible with a simple structure. The heat conductor is in close contact with the inner peripheral surface of the heat transfer tube so that heat conduction on the contact surface is performed smoothly. In order to bring the heat conductor into close contact with the inner peripheral surface of the heat transfer tube, the heat conductor may be attached to the heat transfer tube by means such as brazing, or may be formed integrally with the heat transfer tube. The heat conductor is not normally in contact with the outer peripheral surface of the combustor, but may be in contact. However, the heat conductor is not fixed to the outer peripheral surface of the combustor, and the combustor can be inserted into and removed from the heat transfer tube as will be described later.

  The heat conductor disposed in the combustion gas passage only needs to be in contact with the inner peripheral surface of the heat transfer tube without closing the combustion gas passage, and the shape and number thereof are not particularly limited. For example, one or a plurality of plate-like heat conductors bent so as to form a passage through which combustion gas passes, or a plurality of plate-like heat conductors cut into strips are used as the inner peripheral surface of the heat transfer tube. And may be disposed in the combustion gas passage. Alternatively, a plurality of columnar, conical, pyramidal, frustoconical, or truncated pyramid-shaped heat conductors are in contact with the inner peripheral surface of the heat transfer tube and spaced apart from each other in a staggered or grid pattern It may be arranged in the combustion gas passage in a shape. Further, one or more of these various shapes of heat conductors may be mixed. When using a plate-like heat conductor, the plate surface may be flat or curved, and the columnar heat conductor has a circular, elliptical, triangular, quadrilateral, pentagonal cross-sectional shape. Any polygonal shape such as a hexagon or any other shape may be used. Further, when a plate-shaped heat conductor is disposed in the combustion gas passage, the plate surface of the heat conductor may be parallel to or inclined with respect to the direction of passage of the combustion gas in the combustion gas passage. May be.

  As the heat conductor, any material may be used as long as it has thermal conductivity and can efficiently transfer the heat of the combustion gas to the heat transfer tube when in contact with the combustion gas. It is preferable to use a material having high thermal conductivity. For example, metals such as aluminum, copper, stainless steel, iron, and titanium can be used, and among these, aluminum or copper is preferably used.

  As described above, the heat exchanger with a combustor for fluid heating according to the present invention has a structure in which the combustor is arranged inside the heat exchanger and the both are integrated. It is a small and compact fluid heating device. Further, according to the present invention, the heat exchanger with a combustor for fluid heating of the present invention is simply attached to a fluid container or immersed in a fluid so that at least a portion of the heat transfer tube is located in the fluid container. Various fluids can be heated, and there is no need to separately install a combustion gas passage or a smoke pipe in the fluid container.

  Moreover, in the heat exchanger with a combustor for fluid heating according to the present invention, it is preferable that the combustor is detachably attached to the heat transfer tube. When the combustor is detachably attached to the heat transfer tube, the combustor can be appropriately pulled out of the heat transfer tube and removed from the heat transfer tube, so that one or more heat conductors are arranged inside. The advantage is that cleaning, maintenance, inspection and the like inside the heat transfer tube can be easily performed. As described above, the heat conductor disposed in the combustion gas passage is fixed to the heat transfer tube, but is not fixed to the combustor, so the combustor is pulled out from the heat transfer tube. In either case, the combustor can be easily inserted into the heat transfer tube and attached.

  As a combustor used in the heat exchanger with a combustor for fluid heating of the present invention, any combustor may be used as long as it generates combustion gas and discharges the generated combustion gas from the open end. Preferably, a burner having a burner tube having an open front end and a mixed gas jetting portion provided on the base end side of the burner tube is used as a combustor. It is good to use. When the combustor is a burner as described above, the outer peripheral surface of the burner tube becomes the outer peripheral surface of the combustor, and the combustion gas passage is formed between the outer peripheral surface of the burner tube and the inner peripheral surface of the heat transfer tube. Will be.

  As the mixed gas ejection part in the burner, any shape and structure may be used as long as the ejected mixed gas can be ignited and burned, for example, provided with a mixed gas ejection port such as a nozzle. However, when using a porous member made of a metal fiber or ceramic fiber, or a porous member having a large number of pores connected to the front and back, such as a porous ceramic or a foam metal, as the mixed gas ejection part, The burner becomes a surface combustion burner, which is preferable because higher combustion efficiency can be realized.

  In a preferred embodiment, the burner pipe includes a mixed gas inlet on the base end side with respect to the mixed gas ejection part. When the burner pipe has a mixed gas inlet, a mixed gas of combustion gas and combustion air is supplied from the mixed gas inlet into the burner pipe, and is blown out from the mixed gas jetting portion to be ignited and burned. Can do.

  Moreover, the burner pipe | tube is provided with the fuel gas inlet and the combustion air inlet in the base end part side rather than the mixed gas ejection part in another suitable one aspect | mode. When the burner pipe has a fuel gas inlet and a combustion air inlet, the fuel gas and the combustion air are supplied from the respective inlets into the burner pipe and mixed in the burner pipe to form a mixed gas. Gas can be ejected from the mixed gas ejection part, and can be ignited and burned.

  The burner pipe has an inner peripheral surface or an outer peripheral surface of the burner pipe, or both at a position where the burner pipe is indirectly contacted with the combustion gas passage through a pipe wall of the burner pipe or a position in the combustion gas passage. It is preferable to have a thermally conductive member in contact. When such a heat conductive member is provided inside and / or outside of the burner pipe, the heat of the combustion gas passing through the combustion gas passage is passed through the heat conductive member and the tube wall of the burner pipe. Thus, it is transmitted to the mixed gas or fuel gas or combustion air passing through the burner pipe, and the advantage that the mixed gas can be preheated is obtained, and the combustion efficiency of the burner can be further increased.

  The above-described burner functioning as a combustor may have a combustion tube outside the burner tube. That is, in a preferred example of the heat exchanger with a combustor for fluid heating according to the present invention, the tip end portion is opened outside the burner tube, and the tip end portion is on the tip end side with respect to the tip end portion of the burner tube. A combustion tube protruding in the When the combustor is a burner having such a combustion tube, the outer peripheral surface of the combustion tube becomes the outer peripheral surface of the combustor, and the combustion is performed between the outer peripheral surface of the combustion tube and the inner peripheral surface of the heat transfer tube. A gas passage is formed.

  If the burner functioning as a combustor has a combustion pipe outside the burner pipe, instead of supplying the mixed gas or fuel gas and combustion air directly into the burner pipe, the burner pipe is inserted into the burner pipe. You may make it supply. That is, a mixed gas supply port is provided in the combustion tube, and a mixed gas passage is formed between the inner peripheral surface of the combustion tube and the outer peripheral surface of the burner tube. You may make it pass and supply in a burner pipe | tube from the mixed gas inlet provided in the burner pipe | tube. Alternatively, a fuel gas supply port and a combustion air supply port are provided in the combustion pipe, and fuel gas and combustion air are supplied from the respective supply ports into the combustion pipe, and the inner peripheral surface of the combustion pipe and the outer periphery of the burner pipe They may be mixed in a mixed gas passage formed between the two surfaces to form a mixed gas and supplied into the burner tube from a mixed gas inlet provided in the burner tube.

  As described above, when the mixed gas is supplied into the burner pipe via the mixed gas passage formed between the inner peripheral surface of the combustion pipe and the outer peripheral surface of the burner pipe, the mixed gas supply port Between the fuel gas supply port and the combustion air supply port and the mixed gas inlet, and indirectly between the combustion gas passage and a wall of the combustion pipe. It is preferable that a thermally conductive member in contact with the inner peripheral surface and / or the outer peripheral surface of the combustion pipe is provided at a position in contact with the internal combustion chamber or a position in the combustion gas passage. When such a heat conductive member is provided on the inner peripheral surface and / or the outer peripheral surface of the combustion tube, the heat of the combustion gas passing through the combustion gas passage is transferred to the tube wall of the combustion tube and the heat conductivity. It is transmitted to the mixed gas or fuel gas and combustion air that passes through the mixed gas passage through the member, so that the mixed gas or fuel gas and combustion air can be preheated, and the combustion efficiency of the burner is further increased. The advantage that it can be obtained.

  Moreover, in the heat exchanger with a combustor for fluid heating of the present invention, in a preferred embodiment, the distance M from the tip of the heat transfer tube to the mixed gas ejection portion can heat the fluid to be heated of the heat transfer tube. It is desirable that M ≦ (1/2) L with respect to the length L of such a portion. When M and L are in the above relationship, combustion gas is generated at a relatively distal end portion of the heat transfer tube, and into the combustion gas passage where the heat conductor is disposed while maintaining a high temperature. Therefore, there is an advantage that higher heat transfer efficiency to the heat transfer tube can be realized. On the other hand, when M and L are in a relationship of M> (1/2) L, the combustion gas is generated relatively closer to the base end of the heat transfer tube, and the generated combustion Before the gas travels into the combustion gas passage in which the heat conductor is arranged, a part of the heat is consumed in heating the burner tube and the combustion tube and heating the exhaust gas. Higher heat transfer efficiency to the heat pipe cannot be expected.

  The portion of the heat transfer tube capable of heating the fluid to be heated literally means a heat transfer tube that can be used as a heating body when the fluid is heated using the heat exchanger with a combustor for fluid heating of the present invention. For example, when the heat exchanger with a combustor for fluid heating of the present invention is provided with a flange for attachment to the fluid container to be heated, from the tip of the heat transfer tube to the flange portion Is the length L of the portion of the heat transfer tube that can heat the fluid to be heated. In addition, when no mounting flange is provided, basically, the portion from the tip of the heat transfer tube to the combustion gas exhaust port provided in the heat transfer tube should be used for heating the fluid to be heated. Therefore, the length of the portion is the length L of the portion of the heat transfer tube that can heat the fluid to be heated.

  The heat exchanger with a combustor for fluid heating according to the present invention includes a wall surface and a bottom surface of a container for storing a fluid to be heated so that a portion of the heat transfer tube having a combustion gas passage on the inside contacts the fluid to be heated. Or attached to the upper surface, or immersed in a fluid to be heated. The mixed gas used as the fuel by the heat exchanger with a combustor for fluid heating of the present invention is not particularly limited as long as it can be burned by the heat exchanger with a combustor for fluid heating of the present invention. Alternatively, a mixed gas of fuel gas such as liquefied petroleum gas, liquefied natural gas, or city gas and air can be used. The heat exchanger with a combustor for fluid heating according to the present invention is preferably used for heating a liquid such as water or oil, or a gas such as air, for example, a water heater, a boiler, a hot water tank, or tableware. Although it can be used as a washing machine, boiled noodle machine, fryer, air heater, etc., it can of course be used for heating any fluid.

According to the fluid heating burner with a heat exchanger of the present invention, the structure is simple, since the compact good fluid heating device with heat transfer efficiency is achieved, together with an energy-saving reduces the amount of fuel gas, the CO ₂ The advantage that it can also contribute to reduction is obtained. Moreover, since the heat exchanger with a combustor for fluid heating according to the present invention is configured compactly, it reduces the amount of materials used and contributes to resource saving. In addition, in the heat exchanger with a combustor for fluid heating according to the present invention, when the combustor is detachably attached to the heat transfer tube, the combustor can be appropriately removed from the heat transfer tube and removed. There is an advantage that the heat transfer tube having the heat conductor on the inside can be easily cleaned, maintained, inspected, and the like. Furthermore, according to the heat exchanger with a combustor for heating fluid according to the present invention, the wall surface of the container for storing the fluid to be heated so that the heat transfer tube portion having the combustion gas passage on the inside contacts the fluid to be heated, Since the fluid in the container can be efficiently heated only by being attached to the bottom surface or the top surface or being immersed in the fluid to be heated, there is an advantage that it is extremely easy to use. Incidentally, when the heat exchanger with a combustor for fluid heating according to the present invention is used in a commercial dishwasher, the structure of the gas booster part for supplying hot water for cleaning can be simplified, so that The gas booster that has been externally attached can be incorporated into the main body of the dishwasher, and the arrangement of the dishwasher can be improved.

It is sectional drawing which isolate | separates and shows an example of the heat exchanger with a combustor for fluid heating of this invention into a heat exchanger tube and a combustor. It is sectional drawing which shows the state which attached the combustor of FIG. 1 to the heat exchanger tube. FIG. 3 is a cross-sectional view taken along the line X-X ′ of FIG. 2. FIG. 4 is a Z-Z ′ sectional view of FIG. 3. FIG. 3 is a Y-Y ′ sectional view of FIG. 2. It is sectional drawing which isolate | separates and shows another example of the heat exchanger with a combustor for fluid heating of this invention into a heat exchanger tube and a combustor. It is sectional drawing which shows the state which attached the combustor of FIG. 6 to the heat exchanger tube. It is the figure which cut | disconnected the tube wall of the heat exchanger tube shown in FIG. It is sectional drawing which isolate | separates and shows another example of the heat exchanger with a combustor for fluid heating of this invention isolate | separated into a heat exchanger tube and a combustor. It is sectional drawing which shows the state which attached the combustor of FIG. 9 to the heat exchanger tube. It is sectional drawing which isolate | separates and shows another example of the heat exchanger with a combustor for fluid heating of this invention isolate | separated into a heat exchanger tube and a combustor. It is sectional drawing which shows the state which attached the combustor of FIG. 11 to the heat exchanger tube. It is a figure which shows an example of the dishwasher which used the heat exchanger with a combustor for fluid heating of this invention as a heating source.

  Hereinafter, although the heat exchanger with a combustor for fluid heating of the present invention will be described with reference to the drawings, the present invention is not limited to the illustrated one.

  FIG. 1 is a cross-sectional view showing an example of a heat exchanger with a combustor for fluid heating according to the present invention separated into a heat transfer tube and a combustor. In FIG. 1, 1 is the heat exchanger with a combustor for fluid heating of the present invention, and 2 is a heat transfer tube. The front end 2f of the heat transfer tube 2 is closed, and an opening 2h is formed in the base end 2b. 3 is a combustion gas exhaust port provided between the distal end portion 2f and the base end portion 2b of the heat transfer tube 2, and 4 is used when the heat exchanger 1 with a combustor for fluid heating of the present invention is attached to a vessel wall surface or the like. The flange 4 is attached at an appropriate position between the front end 2 f of the heat transfer tube 2 and the combustion gas exhaust port 3. The cross-sectional shape of the heat transfer tube 2 is usually circular, and it is preferable that the circular shape is free of anisotropy. However, the shape is not necessarily limited to a circular shape, and may be appropriately set according to the cross-sectional shape of the combustor inserted therein. It can be a cross-sectional shape. In addition, in this specification, a front-end | tip part means the edge part (left side edge part in FIG. 1) of the front-end | tip part side of the heat exchanger 1 with a fluid heating combustor, and a base end part is for fluid heating. It means the end of the heat exchanger with a combustor 1 on the base end side (the right end in FIG. 1).

  Reference numerals 5 a, 5 b, and 5 c are heat conductors attached to the inner peripheral surface of the heat transfer tube 2 so as to come into contact with the inner peripheral surface of the heat transfer tube 2. As the heat conductors 5a, 5b, and 5c, it is preferable to use a material having high thermal conductivity. For example, metals such as aluminum, copper, stainless steel, iron, and titanium can be used, and among these, aluminum or copper is used. Is preferred. In this example, the heat conductors 5a, 5b, and 5c attached to the heat transfer tube 2 have different shapes from each other, which will be described later.

  6 is a burner as a combustor, and 7 is a burner pipe constituting the burner 6. The distal end portion 7f of the burner tube 7 is opened, and the proximal end portion 7b of the burner tube 7 is closed by a closing member 8 in a state where a protective tube 11 described later is inserted. A mixed gas inlet 9 is provided on the base end side of the burner pipe 7. Reference numeral 10 denotes a spark rod, 11 denotes a protective tube for the spark rod 10, 12 denotes a support cylinder, and 13 denotes a mixed gas ejection portion. As shown in FIG. 1, the mixed gas ejection portion 13 is disposed between the tip 7 f of the burner tube 7 and the mixed gas inlet 9, and is supported by the support cylinder 12 and the inner peripheral surface of the burner tube 7. Yes. G is a mixed gas passage formed between the inner peripheral surface of the burner tube 7 and the outer peripheral surface of the support cylinder 12, and the mixed gas supplied from the mixed gas inlet 9 passes through this mixed gas passage G. It will be ejected from the mixed gas ejection part 13. Reference numeral 14 denotes a counter electrode of the spark rod 10, which is attached to, for example, the mixed gas ejection part 13. By detecting the electrical resistance between the spark rod 10 and the counter electrode 14, the spark rod 10 can also be used as a flame detection rod. The cross-sectional shape of the burner tube 7 is usually circular, and it is preferable that the circular shape is free of anisotropy. However, the cross-sectional shape of the heat transfer tube 2 into which the burner tube 7 is inserted is not necessarily limited to a circular shape. It can be made into an appropriate cross-sectional shape according to.

  In this example, the mixed gas ejection part 13 is composed of a porous member having a large number of pores communicating with each other, and the burner 6 is mainly composed of a porous member in which the mixed gas ejected from the numerous pores of the porous member is a porous member. It is a surface combustion burner that burns in the vicinity of the surface. As the porous member as described above, for example, a metal fiber or ceramic fiber porous member such as metal knit, porous ceramic, foam metal, or the like can be used. In addition, the mixed gas ejection part 13 is not necessarily limited to the one using a porous member, and may have a nozzle or the like to be described later as a mixed gas ejection port.

  α is a combustion chamber formed on the tip side of the mixed gas ejection part 13 of the burner tube 7, and 15 is a high heat-resistant part located on the tip side of the mixed gas ejection part 13 of the burner tube 7. Since the temperature of the combustion gas generated in the chamber α becomes high, it is made of a material having higher heat resistance than other portions. Instead of using only the portion on the tip end side of the mixed gas jetting portion 13 of the burner tube 7 as a high heat resistant portion, a wider range on the tip end side of the burner tube 7 or the entire burner tube 7 is a material having high heat resistance. Needless to say, it may be configured as a high heat resistant part.

  Reference numeral 16 denotes a heat conductive member which is attached to each of the inner peripheral surface and the outer peripheral surface of the burner tube 7 by means of brazing, for example, and is in contact with both the inner peripheral surface and the outer peripheral surface of the burner tube 7. ing. The heat conductor 16 attached to the inner peripheral surface of the burner tube 7 is located in the mixed gas passage G between the mixed gas ejection portion 13 and the mixed gas inlet 9, and is also disposed on the outer peripheral surface of the burner tube 7. The attached heat conductor 16 is located in a combustion gas passage V to be described later. The heat conductor 16 may be attached only to either the inner side or the outer side of the burner tube 7, and in that case, it contacts only one of the inner peripheral surface or the outer peripheral surface of the burner tube 7. become. The heat conductive member 16 is preferably formed of a metal having good heat conductivity. For example, the heat conductive member 16 is formed of aluminum, copper, stainless steel, iron, titanium, or the like, similar to the heat conductors 5a, 5b, and 5c described above. Among these, aluminum or copper is preferably used. In addition, in this example, although the heat conductive member 16 is plate shape cut | disconnected in strip shape, it is not restricted to plate shape, It can be made into various shapes similarly to the heat conductors 5a, 5b, and 5c. .

  The heat exchanger with a combustor 1 for fluid heating according to the present invention has a burner 6 that is a combustor, as shown by an alternate long and short dash line in FIG. The heat transfer tube 2 is inserted into the heat transfer tube 2 and is assembled by fixing the flange 17 to the base end portion 2b of the heat transfer tube 2 and attaching the flange 17 to the heat transfer tube 2 with at least a tip portion thereof being inserted into the heat transfer tube 2. There is no particular limitation on the means for attaching the burner 6 as a combustor to the heat transfer tube 2, and any appropriate appropriate attachment means such as bolts and screws may be used.

  FIG. 2 is a cross-sectional view showing a state in which the burner 6 that is a combustor is attached to the heat transfer tube 2 by inserting the burner 6 into the heat transfer tube 2 through the opening 2h of the heat transfer tube 2 first. As shown in FIG. 2, the burner 6 that is a combustor is attached to the heat transfer tube 2, whereby the outer peripheral surface of the burner 6 that is a combustor (that is, the outer peripheral surface of the burner tube 7 in this example) and the heat transfer tube 2. Between the inner peripheral surface, a combustion gas passage V is formed from the tip of the burner 6 toward the combustion gas exhaust port 3 provided in the heat transfer tube 2. In addition, as shown in FIG. 2, the heat conductors 5 a, 5 b, 5 c arranged in the combustion gas passage V are fixed to the inner peripheral surface of the heat transfer tube 2 and are in contact with the inner peripheral surface of the heat transfer tube 2. The burner tube 7 is not fixed to the outer peripheral surface. In this example, a gap is left between the heat conductors 5a, 5b, 5c and the outer peripheral surface of the burner tube 7, and the heat conductors 5a, 5b, 5c are connected to the outer peripheral surface of the burner tube 7. However, the heat conductors 5a, 5b, and 5c may be brought into contact with the outer peripheral surface of the burner tube 7 as long as it does not interfere with the insertion and removal of the burner 6 that is a combustor.

  The heat conductive member 16 attached to the inner side of the burner pipe 7 is indirectly between the mixed gas ejection part 13 and the mixed gas inlet 9 with the combustion gas passage V and the wall of the burner pipe 7 being separated. It is in the position that touches. Further, the heat conductive member 16 attached to the outside of the burner pipe 7 is also located between the mixed gas jetting portion 13 and the mixed gas inlet 9 and in the combustion gas passage V.

  M is the distance from the front end portion 2 f of the heat transfer tube 2 to the mixed gas ejection portion 13. In addition, when the mixed gas ejection part 13 has a length in the direction along the longitudinal direction of the heat transfer tube 2, the distance M is the largest of the mixed gas ejection part 13 from the front end 2 f of the heat transfer tube 2. It shall be the distance to the part on the tip side. L is the length of the portion of the heat transfer tube 2 that can heat the fluid to be heated. In this example, the length from the tip 2f of the heat transfer tube 2 to the flange 4 corresponds to this length. As shown in the figure, in the heat exchanger with a combustor 1 for fluid heating of this example, M is smaller than (1/2) L and satisfies the relationship of M ≦ (1/2) L. When M and L have such a relationship, as described above, combustion gas is generated at the relatively tip portion of the heat transfer tube 2, and the heat conductors 5a and 5b are maintained while maintaining a high temperature. Since it progresses into the combustion gas passage V where 5c is arrange | positioned, the advantage that the higher heat transfer efficiency to the heat exchanger tube 2 is realizable is acquired.

  3 is a cross-sectional view taken along the line X-X ′ of FIG. 2. As shown in the figure, a heat conductor 5 a is disposed in the combustion gas passage V formed between the outer peripheral surface of the burner tube 7 and the inner periphery of the heat transfer tube 2. The heat conductor 5a is formed by bending a thin plate-like member so that the cross-sections are alternately reverse U-shaped, and the inner portion of the heat transfer tube 2 is in contact with the inner peripheral surface of the heat transfer tube 2. Attached to the circumference and fixed. On the other hand, there is a gap between the heat conductor 5a and the outer peripheral surface of the burner tube 7, and the heat conductor 5a is not in contact with the outer peripheral surface of the burner tube 7, and is fixed to the outer peripheral surface of the burner tube 7. Not. The heat conductor 5 a may be in contact with the outer peripheral surface of the burner tube 7 as long as it does not hinder the insertion and removal of the burner 6 including the burner tube 7 with respect to the heat transfer tube 2.

  4 is a cross-sectional view taken along the line Z-Z ′ of FIG. 3. However, for convenience, the heat transfer tube 2 is shown in a flat shape. Reference numeral 5a denotes a heat conductor formed by bending the thin plate-like member described in FIG. 3 so that the cross-sections are alternately reversed in a U-shape, and 5b and 5c are different in shape. It is a heat conductor. That is, the heat conductor 5b is a plate-like heat conductor having a relatively short length, and a plurality of the heat conductors 5b are arranged in a straight line at intervals, and the alignment pitch is set between adjacent rows. Arranged by a half pitch. The heat conductor 5c is a cylindrical heat conductor, and is arranged in a staggered manner with a gap between adjacent heat conductors. The heat conductors 5b and 5c are also attached and fixed to the inner peripheral surface of the heat transfer tube 2 so as to be in contact with the inner peripheral surface of the heat transfer tube 2, but are not in contact with the outer peripheral surface of the burner tube 7. The burner tube 7 is not fixed to the outer peripheral surface. Note that the heat conductors 5b and 5c may be in contact with the outer peripheral surface of the burner tube 7 as long as it does not hinder the insertion and removal of the burner 6 with respect to the heat transfer tube 2. is there. In this example, three types of heat conductors 5a to 5c are arranged in the combustion gas passage V, but the shape and type of the heat conductor arranged in the combustion gas passage V are not particularly limited, As long as the heat of the combustion gas passing through the combustion gas passage V can be efficiently transferred to the heat transfer tube 2, any shape of heat conductor may be arranged, and one kind of heat conductor is arranged. Or two types may be sufficient and four or more types may be sufficient.

  FIG. 5 is a cross-sectional view taken along the line Y-Y ′ of FIG. 2. As shown in the figure, the heat conductive member 16 is attached to each of the inner peripheral surface and the outer peripheral surface of the burner tube 7, and is in contact with the inner peripheral surface and the outer peripheral surface of the burner tube 7, respectively. The heat conductive member 16 attached to the inner peripheral surface of the burner tube 7 is located in a mixed gas passage G formed between the inner peripheral surface of the burner tube 7 and the outer peripheral surface of the support cylinder 12. The heat conductive member 16 attached to the outer peripheral surface of the burner tube 7 is located in the combustion gas passage V formed between the outer peripheral surface of the burner tube 7 and the inner peripheral surface of the heat transfer tube 2. .

  The heat exchanger with a combustor 1 for fluid heating of the present invention shown in FIG. 2 operates as follows. That is, when a mixed gas of fuel gas and air is supplied to the mixed gas inlet 9 from a mixed gas supply source (not shown), the supplied mixed gas is between the inner peripheral surface of the burner pipe 7 and the outer peripheral surface of the support cylinder 12. The gas flows in the mixed gas passage G formed in the gas and is ejected from the mixed gas ejection part 13. When a voltage is applied to the spark rod 10 at an appropriate timing, the gas is discharged between the spark rod 10 and the counter electrode 14 to ignite the mixed gas, and the mixed gas burns. Instead of the spark rod 10, the mixed gas may be ignited using other ignition means such as an electric heater.

  The combustion gas generated by the combustion further proceeds in the combustion reaction in the combustion chamber α, becomes a high-temperature combustion gas, collides with the closed tip portion 2f of the heat transfer tube 2, reverses the traveling direction, and the heat transfer tube It progresses to the combustion gas passage V formed between the inner peripheral surface of 2 and the outer peripheral surface of the burner pipe 7. The combustion gas passing through the combustion gas passage V contacts the heat conductors 5a, 5b and 5c one after another over a wide area, and efficiently transfers the heat it has to the heat conductors 5a, 5b and 5c. The heat transferred to the heat conductors 5a, 5b, and 5c is further transferred to the heat transfer tube 2 that is in contact with the heat conductors 5a, 5b, and 5c, and a fluid such as water existing around the heat transfer tube 2 is removed. Will be heated. The combustion gas that has passed through the combustion gas passage V is discharged from the combustion gas exhaust port 3 to the outside, and the heat conductive member that is attached to the outer peripheral surface of the burner pipe 7 before being discharged. The heat transferred to the heat transfer member 16 is transferred to the heat conductive member 16 attached to the inner peripheral surface of the burner tube 7 via the tube wall of the burner tube 7 and mixed gas passage The mixed gas passing through G is preheated. Thus, in this example, the mixed gas supplied from the mixed gas inlet 9 into the mixed gas passage G is preheated by the combustion gas passing through the combustion gas passage V, and the temperature rises in the burner pipe 7. Since it is ejected from the mixed gas ejection part 13 and combusts, higher combustion efficiency can be realized.

  FIG. 6 is a cross-sectional view showing another example of the heat exchanger with a combustor for fluid heating according to the present invention, separated into a heat transfer tube and a combustor, and the same reference numerals are used for the same members as described above. It is attached. In the heat exchanger with a combustor 1 for fluid heating of this example, a combustion pipe 18 is provided outside the burner pipe 7 constituting the burner 6, and the combustor is constituted by the burner 6 and the combustion pipe 18. This is different from the example described above. The front end portion 18 f of the combustion tube 18 is open, and the front end portion 18 f protrudes further toward the front end portion than the front end portion 7 f of the burner tube 7. A base end portion 18 b of the combustion pipe 18 is fixed to the burner pipe 7 and closed. Reference numeral 19 denotes an attachment flange used when attaching the combustion tube 18 to the heat transfer tube 2. Reference numeral 20 denotes a high heat-resistant portion formed on the tip end side of the tip portion 7f of the burner tube 7 of the combustion tube 18. Since high-temperature combustion gas is generated in the combustion chamber α on the inside, It is made of a material with higher heat resistance than the part. Of course, a wider range than that shown in the figure may be made of a material having high heat resistance to form the high heat resistant portion 20. The combustion tube 18 only needs to be able to dispose the burner 6 inside thereof, and the cross-sectional shape thereof can be set to an appropriate shape in accordance with the cross-sectional shape of the burner 6. Reference numeral 21 denotes a nozzle provided in the mixed gas ejection section 13, and the nozzle 21 functions as a gas ejection outlet in the mixed gas ejection section 13. Of course, instead of the nozzle 21, the mixed gas ejection part 13 may be formed of a porous member as in the example shown above.

  The heat transfer tube 2 is basically the same as the above-described example, but the heat conductors 5d, 5e, and 5b are not the heat conductors 5a, 5b, and 5c but the heat transfer tubes 2 are arranged in this order from the front end portion 2f of the heat transfer tube 2. The point which is attached to the inner peripheral surface of the heat transfer tube 2 so as to contact the inner peripheral surface of the heat transfer tube 2 is different from the previous example. The heat conductor 5b is the same as the heat conductor 5b described above.

  In the heat exchanger with a combustor for fluid heating of this example, as shown by a one-dot chain line in FIG. 6, a heat transfer tube with a combustion tube 18 in which a burner 6, which is a combustor, is disposed inside, with its tip end first. 2 is inserted into the heat transfer tube 2 through the opening 2h of the base end portion 2b, and the flange 19 is fixed to the base end portion 2b of the heat transfer tube 2 with at least the tip portion inserted into the heat transfer tube 2. 6 and a combustion tube 18 are assembled by attaching to the heat transfer tube 2.

  7, the combustion tube 18 in which the burner 6 shown in FIG. 6 is arranged is inserted into the heat transfer tube 2 through the opening 2 h of the heat transfer tube 2 with the tip portion first, and attached to the heat transfer tube 2. It is sectional drawing which shows the state. As shown in FIG. 7, the combustion tube 18 in which the burner 6 that is a combustor is disposed is attached to the heat transfer tube 2, so that between the outer peripheral surface of the combustion tube 18 and the inner peripheral surface of the heat transfer tube 2, A combustion gas passage V is formed from the tip of the combustion tube 18 toward the combustion gas exhaust port 3 provided in the heat transfer tube 2. Further, as shown in FIG. 7, the heat conductors 5 d, 5 e, 5 b arranged in the combustion gas passage V are fixed to the inner peripheral surface of the heat transfer tube 2 and are in contact with the inner peripheral surface of the heat transfer tube 2. The outer peripheral surface of the combustion pipe 18 is not fixed. In this example as well, a gap is left between the heat conductors 5d, 5e, 5b and the outer peripheral surface of the combustion tube 18, and the heat conductors 5d, 5e, 5b are connected to the outer peripheral surface of the combustion tube 18. However, the heat conductors 5d, 5e, and 5b may be in contact with the outer peripheral surface of the combustion tube 18 as long as they do not interfere with the insertion and removal of the burner 6 that is a combustor and the combustion tube 18.

  In this example, the distance M from the front end portion 2f of the heat transfer tube 2 to the mixed gas ejection portion 13 is shorter than (1/2) of the length L of the heat transfer tube 2 that can heat the fluid to be heated. Since ≦ (1/2) L, the combustion gas is generated at the relatively tip portion of the heat transfer tube 2, and the heat conductors 5d, 5e, and 5b are arranged while maintaining a high temperature. Proceeding into the combustion gas passage V, the advantage that higher heat transfer efficiency to the heat transfer tube 2 can be realized. Incidentally, also in this example, the length from the front-end | tip part 2f of the heat exchanger tube 2 to the flange 4 is equivalent to the length L of the part which can heat the heating object fluid of the heat exchanger tube 2. FIG.

  FIG. 8 is a view showing the heat transfer tube 2 in a flat shape by cutting the tube wall of the heat transfer tube 2 shown in FIG. 6 in the longitudinal direction. As shown in the figure, the heat conductor 5d has a shape in which plate-like members cut into strips are alternately bent along the longitudinal direction thereof into reverse “shapes”. Thermal conductors 5d are attached to the heat transfer tube 2 in parallel with each other. Further, the heat conductor 5e has a truncated cone shape and is arranged in a staggered manner. The heat conductor 5b is the same as described above.

  The heat exchanger with a combustor 1 for fluid heating of the present invention shown in FIG. 7 operates as follows. That is, when a mixed gas of fuel gas and air is supplied to the mixed gas inlet 9 from a mixed gas supply source (not shown), the supplied mixed gas flows in the mixed gas passage G inside the burner pipe 7 and jets the mixed gas. It ejects from the nozzle 21 of the part 13. When a voltage is applied to the spark rod 10 at the expected timing, the gas is discharged between the spark rod 10 and the tip 7f of the burner tube 7 also serving as the ground electrode, and the mixed gas is ignited, and the mixed gas is combusted. The combustion gas generated by the combustion further proceeds in the combustion reaction in the combustion chamber α, becomes a high-temperature combustion gas, collides with the closed tip portion 2f of the heat transfer tube 2, reverses the traveling direction, and the heat transfer tube It progresses to the combustion gas passage V formed between the inner peripheral surface of 2 and the outer peripheral surface of the combustion pipe 18. The combustion gas passing through the combustion gas passage V contacts the heat conductors 5d, 5e and 5b one after another over a wide area, and efficiently transfers the heat it has to the heat conductors 5d, 5e and 5b. The heat transferred to the heat conductors 5d, 5e, and 5b is further transferred to the heat transfer tube 2 that is in contact with the heat conductors 5d, 5e, and 5b, and a fluid such as water existing around the heat transfer tube 2 is transferred. Will be heated. The combustion gas that has passed through the combustion gas passage V is discharged from the combustion gas exhaust port 3 to the outside.

  FIG. 9 is a cross-sectional view showing still another example of the heat exchanger with a combustor for fluid heating according to the present invention, separated into a heat transfer tube and a combustor, and the same members as described above are the same. The code | symbol is attached | subjected. The heat exchanger with a combustor 1 for fluid heating of this example is the same as that shown in FIGS. 6 and 7 in that the burner pipe 7 constituting the burner 6 has a combustion pipe 18 on the outside thereof. However, in this example, the combustion pipe 18 includes a mixed gas supply port 22 on the base end 18 b side, and a mixed gas supply is provided between the inner peripheral surface of the combustion pipe 18 and the outer peripheral surface of the burner pipe 7. 6 and 7 is different in that a mixed gas passage G is formed from the port 22 toward the mixed gas inlet 9 of the burner pipe 7.

  Further, in the mixed gas passage G, a heat conductive member 16 that is in contact with the inner peripheral surface of the combustion pipe 18 is located at a position between the mixed gas supply port 22 and the mixed gas inlet 9. It is attached to the surface. On the other hand, in the same position between the mixed gas supply port 22 and the mixed gas inlet 9 and in the combustion gas passage V, the heat conductive member 16 that contacts the outer peripheral surface of the combustion tube 18 is located in the combustion tube 18. It is attached to the outer peripheral surface. The heat conductive member 16 may be attached to only one of the inner peripheral surface and the outer peripheral surface of the combustion tube 18 and may be brought into contact with only one of them. Reference numeral 23 denotes a partition wall for directing the mixed gas passing through the mixed gas passage G to the mixed gas inlet 9 provided in the burner pipe 7 instead of the front end portion 18 f of the combustion pipe 18. It is provided.

  The heat transfer tube 2 is basically the same as the example described above, but the heat conductors 5d, 5f, and 5g are in contact with the inner peripheral surface of the heat transfer tube 2 in this order from the front end portion 2f of the heat transfer tube 2. Thus, the point attached to the internal peripheral surface of the heat exchanger tube 2 is different from the previous example. The heat conductor 5f has a triangular pyramid shape, and a plurality of heat conductors 5f are attached to the inner peripheral surface of the heat transfer tube 2 in a grid pattern. The heat conductor 5g has a strip-like thin flat plate shape, and a plurality of the heat conductors 5g are attached to the inner peripheral surface of the heat transfer tube 2 in parallel with each other. The heat conductor 5d is the same as the heat conductor 5d described above.

  FIG. 10 shows the combustor shown in FIG. 9 composed of the burner 6 and the combustion pipe 18 as shown by a one-dot chain line in FIG. A section showing a state in which the flange 19 is fixed to the base end portion 2b of the heat transfer tube 2 and attached to the heat transfer tube 2 with at least a distal end portion thereof being inserted into the heat transfer tube 2 by being inserted into the heat transfer tube 2 FIG.

  As shown in FIG. 10, the combustion tube 18 in which the burner 6 that is a combustor is disposed is attached to the heat transfer tube 2, whereby between the outer peripheral surface of the combustion tube 18 and the inner peripheral surface of the heat transfer tube 2, A combustion gas passage V is formed from the tip of the combustion tube 18 toward the combustion gas exhaust port 3 provided in the heat transfer tube 2. The heat conductors 5d, 5f, and 5g arranged in the combustion gas passage V are fixed to the inner peripheral surface of the heat transfer tube 2 and are in contact with the inner peripheral surface of the heat transfer tube 2, but the outer periphery of the combustion tube 18 The heat conductors 5d, 5f, and 5g are not fixed to the outer peripheral surface of the combustion tube 18 without contacting the surface. However, in the case where it does not hinder the insertion and removal of the combustion tube 18 in which the burner 6 is disposed, the heat conductors 5d, 5f, and 5g are in contact with the outer peripheral surface of the combustion tube 18. Also good. The heat conductive member 16 attached to the inside of the combustion pipe 18 is between the mixed gas supply port 22 and the mixed gas inlet 9 and separates the combustion gas passage V and the tube wall of the combustion pipe 18. It is in a position to contact indirectly. Further, the heat conductive member 16 attached to the outside of the combustion pipe 18 is located between the mixed gas supply port 22 and the mixed gas inlet 9 and in the combustion gas passage V.

  Also in this example, the distance M from the tip portion 2f of the heat transfer tube 2 to the mixed gas ejection portion 13 is shorter than (1/2) of the length L of the portion of the heat transfer tube 2 that can heat the fluid to be heated. There is a relationship of M ≦ (1/2) L. For this reason, the combustion gas is generated in the combustion chamber α located at a relatively distal end portion of the heat transfer tube 2, and enters the combustion gas passage V in which the heat conductors 5d, 5e, and 5b are arranged while maintaining a high temperature. Therefore, there is an advantage that higher heat transfer efficiency to the heat transfer tube 2 can be realized.

  The heat exchanger with a combustor 1 for fluid heating of the present invention shown in FIG. 10 operates as follows. That is, when a mixed gas of fuel gas and air is supplied from a mixed gas supply source (not shown) to the mixed gas supply port 22 provided in the combustion pipe 18, the supplied mixed gas is mixed with the inner peripheral surface of the combustion pipe 18 and the burner. It flows in the mixed gas passage G formed between the outer peripheral surface of the pipe 7, flows into the burner pipe 7 from the mixed gas inlet 9 of the burner pipe 7, and is ejected from the nozzle 21 of the mixed gas ejection section 13. When a voltage is applied to the spark rod 10 at the expected timing, the gas is discharged between the spark rod 10 and the tip 7f of the burner tube 7 also serving as the ground electrode, and the mixed gas is ignited, and the mixed gas is combusted. The combustion gas generated by the combustion further proceeds in the combustion reaction in the combustion chamber α, becomes a high-temperature combustion gas, collides with the closed tip portion 2f of the heat transfer tube 2, reverses the traveling direction, and the heat transfer tube It progresses to the combustion gas passage V formed between the inner peripheral surface of 2 and the outer peripheral surface of the combustion pipe 18. The combustion gas that passes through the combustion gas passage V contacts the heat conductors 5d, 5f, and 5g one after another over a wide area, and efficiently transfers the heat it has to the heat conductors 5d, 5f, and 5g. The heat transferred to the heat conductors 5d, 5f, and 5g is further transferred to the heat transfer tube 2 that is in contact with the heat conductors 5d, 5f, and 5g, and a fluid such as water existing around the heat transfer tube 2 is removed. Will be heated.

  The combustion gas that has passed through the combustion gas passage V is discharged from the combustion gas exhaust port 3 to the outside, but the heat that is held before being discharged is the heat provided on the outer peripheral surface of the combustion tube 18. The heat transferred to the conductive member 16 is transferred to the heat conductive member 16 attached to the inside of the combustion pipe 18 via the tube wall of the combustion pipe 18, and is conducted in the mixed gas passage G. The mixed gas passing therethrough is preheated in contact with the sex member 16. Thus, in this example, the mixed gas supplied into the mixed gas passage G from the mixed gas supply port 22 is preheated by the combustion gas passing through the combustion gas passage V, and the burner pipe 7 is in a state where the temperature is increased. Since it is ejected from the mixed gas ejection part 13 and burns, higher combustion efficiency can be realized.

  FIG. 11 is a cross-sectional view showing still another example of the heat exchanger with a combustor for fluid heating according to the present invention separated into a heat transfer tube and a combustor, and the same members as those described above are the same. The code | symbol is attached | subjected. In the heat exchanger with a combustor 1 for fluid heating in this example, a fuel gas supply pipe 26 having a fuel gas inlet 24 and a fuel gas outlet 25 is provided inside the burner pipe 7. For example, it differs from the one shown in FIGS. 1 and 2 in that a combustion air inlet 27 is provided on the base end side of the fuel gas outlet 25. That is, the fuel gas is supplied from the fuel gas inlet 24 into the fuel gas supply pipe 26 and is jetted from the fuel gas outlet 25 into the burner pipe 7. On the other hand, the combustion air is supplied into the burner pipe 7 from the combustion air inlet 27 and mixed with the fuel gas ejected from the fuel gas outlet 25 in the burner pipe 7 to become a mixed gas. In this case, a space formed between the inner peripheral surface of the burner pipe 7 and the outer peripheral surface of the fuel gas supply pipe 26 becomes a mixing portion of the fuel gas and the combustion air. The generated mixed gas passes through the mixed gas passage G and is ejected from the mixed gas ejection section 13. Thus, in this example, the mixed gas in which the fuel gas and the combustion air are mixed in advance is not supplied into the burner pipe 7, but the fuel gas and the combustion air are supplied to the fuel gas inlet 24 and the combustion gas. Each is supplied into the burner pipe 7 from the combustion air inlet 27 and mixed in the burner pipe 7 to become a mixed gas.

  Instead of supplying the mixed gas directly to the burner pipe 7, as in this example, the fuel gas and the combustion air are separately supplied into the burner pipe 7, and both are mixed in the burner pipe 7 to mix the mixed gas. Is not required, the mixing device for premixing the fuel gas and the combustion air is not required. Therefore, the fluid heating combustor-equipped heat exchanger 1 of the present invention can be further reduced in size. Benefits are gained. To supply the fuel gas to the fuel gas inlet 24, an appropriate fuel gas source may be connected to the fuel gas inlet. To supply the combustion air to the combustion air inlet 27, the appropriate combustion air source is burned. It may be connected to the combustion air inlet 27 or an appropriate air supply source such as a blower may be connected to the combustion air inlet 27.

  The heat transfer tube 2 is basically the same as the example described above, but the heat conductors 5g and 5g are in contact with the inner peripheral surface of the heat transfer tube 2 in this order from the front end 2f of the heat transfer tube 2. The point attached to the internal peripheral surface of the heat exchanger tube 2 differs from the previous example. The heat conductor 5g is the same as described above, has a strip-like thin flat plate shape, and a plurality of heat conductors are attached to the inner peripheral surface of the heat transfer tube 2 in parallel with each other. In addition, it cannot be overemphasized that the heat conductor attached to the internal peripheral surface of the heat exchanger tube 2 is not restricted to the heat conductor 5g.

  12 is a cross-sectional view showing a state in which the burner 6 which is the combustor shown in FIG. 11 is attached to the heat transfer tube 2 by inserting the burner 6 into the heat transfer tube 2 through the opening 2h of the heat transfer tube 2 first. It is. As shown in FIG. 2, the burner 6, which is a combustor, is attached to the heat transfer tube 2, so that the heat transfer tube extends from the tip of the burner 6 between the outer peripheral surface of the burner tube 7 and the inner peripheral surface of the heat transfer tube 2. A combustion gas passage V directed to the combustion gas exhaust port 3 provided at 2 is formed. Further, as shown in FIG. 12, the heat conductors 5 g and 5 g arranged in the combustion gas passage V are fixed to the inner peripheral surface of the heat transfer tube 2 and are in contact with the inner peripheral surface of the heat transfer tube 2. It is not in contact with the outer peripheral surface of the tube 7 and is not fixed to the outer peripheral surface of the burner tube 7. As in the above example, the heat conductors 5g and 5g may be brought into contact with the outer peripheral surface of the burner tube 7 within a range that does not hinder the insertion and removal of the burner 6 that is a combustor.

  Also in this example, the distance M from the tip portion 2f of the heat transfer tube 2 to the mixed gas ejection portion 13 is shorter than (1/2) of the length L of the portion of the heat transfer tube 2 that can heat the fluid to be heated. There is a relationship of M ≦ (1/2) L. For this reason, the combustion gas is generated in the combustion chamber α located at a relatively distal end portion of the heat transfer tube 2, and proceeds into the combustion gas passage V in which the heat conductors 5g and 5g are arranged while maintaining a high temperature. Therefore, an advantage that higher heat transfer efficiency to the heat transfer tube 2 can be realized. In the heat exchanger 1 with a combustor for fluid heating according to the present invention, it is preferable that M and L have a relationship of M ≦ (1/2) L, but a relationship of M ≦ (1/2) L. It is not essential that M and L need to satisfy the relationship of M ≦ (1/2) L as long as the reduction in heat transfer efficiency is allowed.

  The heat exchanger with a combustor 1 for fluid heating of the present invention shown in FIG. 12 operates as follows. That is, fuel gas is supplied from a fuel gas supply source (not shown) to the fuel gas inlet 24, and combustion air is supplied from an appropriate combustion air source to the combustion air inlet 27. The fuel gas supplied from the fuel gas inlet 24 into the fuel gas supply pipe 26 is ejected from the fuel gas outlet 25 into the burner pipe 7 where air supplied from the combustion air inlet 27 into the burner pipe 7 is injected. To produce a mixed gas. The generated mixed gas flows in the mixed gas passage G formed between the inner peripheral surface of the burner pipe 7 and the outer peripheral surface of the support cylinder 12, is ejected from the mixed gas ejection portion 13, and is ignited by the spark rod 10. Burn. The combustion gas generated by the combustion further proceeds in the combustion reaction in the combustion chamber α, becomes a high-temperature combustion gas, collides with the closed tip portion 2f of the heat transfer tube 2, reverses the traveling direction, and the heat transfer tube It progresses to the combustion gas passage V formed between the inner peripheral surface of 2 and the outer peripheral surface of the burner pipe 7. The combustion gas passing through the combustion gas passage V contacts the heat conductors 5g and 5g one after another over a wide area, and the heat that the combustion gas has is transferred to the heat transfer tube 2 via the heat conductors 5g and 5g. A fluid such as water existing around the heat transfer tube 2 is heated.

  In the examples shown in FIGS. 11 and 12, the combustion pipe 18 is not provided outside the burner pipe 7, but even when the combustion pipe 18 is provided outside the burner pipe 7, Instead of supplying the mixed gas directly into the burner pipe 7, fuel gas and combustion air may be supplied into the burner pipe 7 and mixed in the burner pipe 7 to form a mixed gas. Further, instead of supplying the mixed gas directly into the mixed gas passage G formed between the outer peripheral surface of the burner tube 7 and the inner peripheral surface of the combustion tube 18, fuel gas and combustion air are respectively supplied to the combustion tube. The gas may be supplied into 18 and mixed in the mixed gas passage G in the combustion pipe 18 to form a mixed gas.

  FIG. 13 is a diagram showing an example of a dishwasher using the heat exchanger with a combustor for fluid heating of the present invention as a heating source. In FIG. 13, 28 is a dishwasher, 29 is a washing tank, 30 is a water storage tank, and P is a pump that supplies hot water heated in the water storage tank 30 to the washing tank 29. As shown in the figure, the heat exchanger with a combustor 1 for fluid heating according to the present invention is attached to the wall surface of the dishwasher 28 by the flange 4 so that the heat transfer tube 2 is located in the water storage tank 30. The mixed gas supplied from the mixed gas inlet 9 burns in the heat exchanger 1 with a fluid heating combustor and heats the water in the water storage tank 30 through the heat transfer tube 2 and then burns as a combustion gas. The gas is exhausted from the gas exhaust port 3 to the outside. The heat exchanger with a combustor 1 for fluid heating according to the present invention is small and compact, and since the combustor and the heat exchanger are integrated, when heating the water in the water storage tank 30, It is only necessary to attach the heat transfer tube 2 to the wall surface of the dishwasher 28 so that the portion of the heat transfer tube 2 is located in the water storage tank 30. Thus, when the heat exchanger with a combustor for fluid heating according to the present invention is used as a heating source for a dishwasher, a gas booster that has been externally attached can be incorporated into the main body of the dishwasher. It becomes possible. The dishwasher incorporating the gas booster in the main body has the advantage that the outer shape is simple and the arrangement is very good when it is installed in a kitchen or the like.

As described above, the heat exchanger with a combustor for fluid heating according to the present invention can efficiently heat a fluid with high heat transfer efficiency, which is energy saving and contributes to CO ₂ reduction. . Furthermore, the heat exchanger with a combustor for fluid heating according to the present invention has a simple structure and can be made compact and compact, so that it uses less materials and is useful for saving resources. The heat exchanger with a combustor for fluid heating according to the present invention can be heated by simply attaching it to a container containing the heated fluid so that the heat transfer tube portion is in contact with the heated fluid or immersing it in the heated fluid. Since the fluid can be efficiently heated, the fluid such as water, oil, and air can be heated easily and simply, and its industrial applicability is great.

DESCRIPTION OF SYMBOLS 1 Heat exchanger with a combustor for fluid heating 2 Heat transfer tube 3 Combustion gas exhaust port 4, 17, 19 Flange 5a-5g Thermal conductor 6 Burner 7 Burner tube 8 Closing member 9 Mixed gas inlet 10 Spark rod 11 Protection tube 12 Support Tube 13 Mixed gas ejection part 14 Counter electrode 15, 20 High heat resistance part 16 Thermally conductive member 18 Combustion tube 21 Nozzle 22 Mixed gas supply port 23 Partition wall 24 Fuel gas inlet 25 Fuel gas injection port 26 Fuel gas supply tube 27 For combustion Air inlet 28 Dishwasher 29 Washing tank 30 Water storage tank α Combustion chamber G Mixed gas passage V Combustion gas passage P Pump

Claims (13)

A heat transfer tube having a distal end portion closed and having an opening at the proximal end portion and having a combustion gas exhaust port between the distal end portion and the proximal end portion; a distal end portion that generates combustion gas and opens the generated combustion gas; From the opening of the base end portion of the heat transfer tube, and at least its distal end is inserted into the heat transfer tube, and is attached to the heat transfer tube, and the outer peripheral surface of the combustor and the heat transfer tube A combustor that forms a combustion gas passage from the tip of the combustor to the combustion gas exhaust port between the inner peripheral surface of the heat exchanger tube and the inner peripheral surface of the heat transfer tube. to one or more have a heat conductor, the combustion gas passage arranged the heat conductor, opposite the plate-shaped member in cross section alternately in the longitudinal direction orthogonal to the plane of the heat transfer tube The inner circumference of the heat transfer tube Fluid heating burner with a heat exchanger which is attached to the inner circumferential surface of the heat transfer tube in a portion in contact with.   The heat exchanger with a combustor for fluid heating according to claim 1, wherein the combustor is detachably attached to the heat transfer tube.   3. The burner having a burner pipe having an open front end portion and a mixed gas jetting portion provided on a base end side of the front end portion of the burner pipe. Heat exchanger with combustor for fluid heating.   The heat exchanger with a combustor for fluid heating according to claim 3, wherein the burner pipe includes a mixed gas inlet on a base end side of the mixed gas ejection part.   4. The heat exchanger with a combustor for fluid heating according to claim 3, wherein the burner pipe is provided with a fuel gas inlet and a combustion air inlet on a base end side of the mixed gas ejection part.   The burner pipe is in contact with the inner peripheral surface and / or outer peripheral surface of the burner pipe at a position where the burner pipe is indirectly in contact with the combustion gas passage across the tube wall of the burner pipe or at a position in the combustion gas passage. The heat exchanger with a combustor for fluid heating according to any one of claims 3 to 5, further comprising a thermally conductive member.   The fluid heating according to any one of claims 3 to 5, further comprising a combustion tube having an opening at the outer side of the burner tube, the tip of which protrudes more toward the tip than the tip of the burner tube. Heat exchanger with combustor.   A combustion tube is provided on the outside of the burner tube, the tip of which opens, and the tip of the combustion tube protrudes toward the tip of the burner tube. The combustion tube includes a mixed gas supply port, and the combustion A mixed gas passage from the mixed gas supply port to the mixed gas inlet is formed between the inner peripheral surface of the tube and the outer peripheral surface of the burner tube, and between the mixed gas supply port and the mixed gas inlet And the inner peripheral surface and / or the outer peripheral surface of the combustion pipe are in contact with the combustion gas passage indirectly through the tube wall of the combustion pipe or in the combustion gas passage. The heat exchanger with a combustor for fluid heating according to claim 4, wherein a heat conductive member is provided.   A combustion tube is provided outside the burner tube, with a distal end opening and a distal end projecting toward the distal end side of the burner tube. The combustion tube has a fuel gas supply port and a combustion air supply. A mixed gas passage that extends from the fuel gas supply port and the combustion air supply port to the mixed gas inlet between the inner peripheral surface of the combustion tube and the outer peripheral surface of the burner tube, Between the fuel gas supply port and the combustion air supply port and the mixed gas inlet, the position is in contact with the combustion gas passage indirectly through the wall of the combustion pipe or in the combustion gas passage. The heat exchanger with a combustor for fluid heating according to claim 4, wherein a heat conductive member in contact with the inner peripheral surface and / or the outer peripheral surface of the combustion pipe is provided at a position.   The distance M from the tip of the heat transfer tube to the mixed gas jetting portion has a relationship of M ≦ (1/2) L with respect to the length L of the portion of the heat transfer tube that can heat the fluid to be heated. The heat exchanger with a combustor for fluid heating according to any one of claims 3 to 9.   The heat exchanger with a combustor for fluid heating according to any one of claims 1 to 10, further comprising a flange for mounting between a tip portion of the heat transfer tube and the combustion gas exhaust port.   The heat exchanger with a combustor for fluid heating according to claim 11, wherein the heat exchanger includes a heated fluid tank that contains a heated fluid, and the heat transfer tube portion is located in the heated fluid tank. Heated fluid use equipment that is attached via.   The heating fluid using device according to claim 12, wherein the heating fluid using device is a water heater, a boiler, a hot water tank, a dishwasher, a boiled noodle machine, a fryer, or an air heater.

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