JP2012097926A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress post-boiling by a pilot burner in a hot-water supply heat exchanger upon re-tapping hot water after hot-water supply is once stopped.SOLUTION: A pilot burner 38 for a pilot flame is disposed between a hot-water supply main burner 10 and a bath main burner 39, and the pilot flame is used to ignite the main burners 10, 39. After combustion on the main burners 10, 39 is stopped, combustion on the pilot burner 38 is continued until an extinguishing operation is carried out. A plurality of fins 3 are arranged on a main heat exchange conduit 4 in a hot-water supply heat exchanger 7, the fins arranged as spaced apart from one another in the longitudinal direction of the main heat exchange conduit 4. The main heat exchange conduit 4 is arranged in such a way that the conduit starts, as a water inlet 1, at the end of the heat exchanger 7 right above the hot-water supply main burner 10 closer to the pilot burner 38, passes over the end and meanders in the hot-water supply heat exchanger 7, toward a water outlet 2 at an end in the opposite side heat exchanger 7, farther from the pilot burner 38.

Description

  The present invention relates to a combustion apparatus including a pilot burner for ignition, a hot water supply main burner ignited by a pilot burner, and a bath main burner.

  FIG. 4 shows an example of the combustion apparatus by a schematic system diagram. This combustion apparatus is, for example, a balance-type bath tank disposed in a bathroom, and is a natural combustion type combustion apparatus that is not a forced combustion system using a fan. This combustion apparatus has a hot water supply main burner 10 and a hot water supply heat exchanger 7 heated by the hot water supply main burner 10. The hot water supply heat exchanger 7 is made of copper, and is disposed above the hot water supply main burner 10 with a space from the hot water supply main burner 10. The hot water supply heat exchanger 7 has a pipe through which water passes, and this pipe has a main heat exchange pipe 4 and a water pipe (winding pipe) 57. Connected to the hot water supply heat exchanger 7 are a water supply introduction passage 19 for introducing water into the pipes 4 and 57 and a hot water supply passage 11 for guiding water heated through the pipes 4 and 57 to a hot water supply destination. Yes.

  A hot-water tap 9 is provided at the distal end side of the hot-water supply passage 11. In this example, the hot-water tap 9 is formed of a switching lever type plug. This type of hot water tap 9 selectively switches hot water that has passed through the hot water supply passage 11 from either the hot water discharge pipe 30 side of the currant side or the shower side passage 31 by switching the lever. A state where the hot water is selected from the side of the hot water discharge pipe 30 is shown.

  A water amount adjusting mechanism 21 is connected to the water supply introduction passage 19, and the water amount adjusting mechanism 21 is provided with a water governor 15, a diaphragm case 13, and a water amount adjusting chamber 20. The diaphragm case 13 is provided with a diaphragm 14, and the diaphragm 14 divides the inside of the diaphragm case 13 into a primary chamber 13a and a secondary chamber 13b. The water amount adjustment chamber 20 is provided with a temperature regulator 23, and the temperature regulator 23 is connected to the temperature adjustment knob 22.

  The water amount adjusting mechanism 21 is connected to a water supply passage 8 for supplying water to the water amount adjusting mechanism 21, passages 16 and 18 for leading water from the water amount adjusting mechanism 21, and a drain passage 24. A filter 25 is interposed in the water supply passage 8, and a drain plug 26 is provided in the drainage passage 24. The water supply introduction passage 19 and the hot water supply passage 11 generate a differential pressure by the amount corresponding to the pressure loss when the hot water supply heat exchanger 7 is passed through at the time of the hot water, but the low pressure due to this pressure loss is caused by the passage 16 to generate a secondary diaphragm. It is transmitted to the chamber 13b.

  The hot water supply main burner 10 is provided with a capacity switching knob 49, and a gas passage 32 is connected to the hot water supply main burner 10. The gas passage 32 is connected to a gas introduction passage 35 through a water pressure automatic gas valve 33 and an instrument plug 34. The automatic water gas valve 33 is connected to the diaphragm 14, and the instrument plug 34 is formed by having an instrument plug knob (operation knob) 48, a shaft 70, and a closing member 53 that is a manual opening / closing passage. Has been. The gas introduction passage 35 is for introducing fuel gas from the outside into the combustion apparatus, and the fuel gas introduced from the gas introduction passage 35 is supplied to the hot water supply main burner 10 through the gas passage 32 via the appliance plug 34. Is done.

  In addition, gas passages 36 and 37 are connected to the appliance plug 34, and the fuel gas introduced from the gas introduction passage 35 to the appliance plug 34 is introduced into the pyrophoric burner 38 through the gas passage 36, and gas is supplied to the appliance plug 34. A bath main burner (a reheating main burner for reheating a bath) 39 is supplied through a passage 37. On the upper side of the bath main burner 39, a bath heat exchanger (heating heat exchanger) 40 heated by the bath main burner 39 is provided with a distance from the bath main burner 39. The bath heat exchanger 40 has a connection part with a connection diameter of φ45 mm with a bathtub (not shown), and is a natural circulation bath (if the bathtub is filled with water without using a pump, it becomes a natural heat exchanger. When water enters and heat is applied with gas, etc., the bath water is drawn in by the temperature difference (buoyancy), the hot water is discharged into the bathtub, and the water is removed from the heat exchanger when the water is removed from the bathtub. . The bath heat exchanger 40 is provided with an air-fired safety device 46, and a hot water supply overheat prevention device 47 is provided on the outlet side of the hot water supply heat exchanger 7. The hot water supply overheat prevention device 47 and the airing safety device 46 are electrically connected to the overheat prevention device 45.

An ignition electrode 43 and a thermocouple 44 are provided in the vicinity of the flame opening of the pilot burner 38. The ignition electrode 43 is an electrode for igniting the pilot burner 38, and the ignition electrode 43 is connected to a piezoelectric ignition device 50 including an ignition handle 65. The thermocouple 44 detects the heat of the flame coming out of the flame outlet of the pilot burner 38 by an electromotive force due to the heat, and is electrically connected to the electromagnetic valve 54. If the electromotive force of the thermocouple 44 becomes equal to or higher than a predetermined solenoid valve maintenance voltage (L ₀ ) with the instrument plug knob 48 pushed down, the solenoid valve 54 is opened even if the instrument plug knob 48 is released. When the state is maintained and the electromotive force of the thermocouple falls below the electromagnetic valve maintenance voltage, the electromagnetic valve 54 operates in the closing direction.

  Note that FIG. 4 is a system configuration diagram, and the reheating burner 39 and the hot water supply burner 10 are illustrated at positions separated from each other, but the reheating burner 39 and the hot water supply burner 10 are actually spaced from each other. Next to each other, they are arranged side by side. A pilot burner 38 is provided in the interval between the reheating burner 39 and the hot water supply burner 10, and the main burner is ignited by using at least one of the reheating burner 39 and the hot water supply burner 10 using the fire of the pilot burner 38. It is configured to perform combustion.

  Further, for example, as shown in FIG. 5, the hot water supply heat exchanger 7 has a cylindrical body (tubular body) 56 that is erected on the hot water supply main burner 10 with an interval therebetween. Has a substantially rectangular cross section. A water winding tube 57 is provided on the outer peripheral side of the cylindrical body 56, and the water winding tube 57 is wound from the lower side of the cylindrical body 56 while being wound in a substantially horizontal oblique direction along the outer peripheral side of the cylindrical wall of the cylindrical body 56. Circulate in a spiral toward the upper side. In the figure, reference numeral 59 denotes an inlet portion of the water pipe 57, and an end portion of the water pipe 57 is the end of the hot water heat exchanger 7 on the opposite side of the pilot burner 38 away from the pilot burner 38 at the upper end of the cylindrical body 56. Is connected to the water inlet 1 of the main heat exchange conduit 4.

  The main heat exchange pipe 4 is arranged in a meandering manner from the inlet 1 side toward the end of the hot water supply heat exchanger 7 immediately above the hot water supply main burner 10 near the pilot burner 38, The water outlet 2 of the heat exchange pipe 4 is formed at the end of the hot water supply heat exchanger 7 immediately above the hot water supply main burner 10 near the pilot burner 38. On the upper side of the cylindrical body 56, a plurality of fins 3 are disposed in the longitudinal direction of the main heat exchange pipe 4 with a space therebetween. Although the fins 3 are partially omitted in the drawing, the fins 3 are arranged at equal intervals in a region from one end side to the other end side of the fin portion 61. In the figure, reference numeral 58 denotes a connecting pipe, and reference numeral 60 denotes a water supply connection port.

  Further, the hot water supply main burner 10 is arranged in parallel with the hot water supply main burner 10, the pilot burner 38, and the bath main burner 39 (not shown in FIG. 5, but arranged on the right side of the pilot burner 38). Are provided with a plurality of combustion surfaces 10A, 10B, 10C. When the hot water supply main burner 10 is burned, the combustion surface 10A closest to the pilot burner 38 among the plurality of combustion surfaces 10A, 10B, 10C is burned. In FIG. 5, the hot water tap 9 is shown as being provided in the hot water outlet 30 side and the shower side passage 31, but the arrangement of the hot water tap 9 is not particularly limited (as shown in FIG. 4). The hot water discharge operation of the hot water pipe 30 side and the shower side passage 31 may be appropriately performed with one hot water tap 9).

  In this combustion apparatus, when a water faucet (not shown) is opened, as shown in FIG. 4, water flows through the water supply passage 8, the water governor 15, and flows into the primary chamber 13 a of the diaphragm case 13. It branches by the regulator 23 and one of them passes through the passages 16 and 18 and is led to the hot water supply passage 11 side. The other is led to the hot water supply passage 11 side through the water supply introduction passage 19 and the hot water supply heat exchanger 7, and flows from the hot water supply passage 11 to the hot water discharge pipe 30 (or the shower side passage 31) to be discharged.

  When the instrument plug knob 48 is pushed down, the electromagnetic valve 54 is opened, and the instrument gas is flowed through the gas introduction passage 35 to the inlet of the instrument plug 34 by operating the instrument plug knob 48 to the “flame” position. The fuel gas passes through the instrument plug 34 and flows to the pilot burner 38. In this state, turning the ignition handle 65 of the piezoelectric ignition device 50 causes the ignition electrode 43 to perform a spark discharge to ignite the pilot burner 38. Is done.

  Further, the fuel gas flows to the position where the water pressure automatic gas valve 33 is disposed by adjusting the instrument plug knob 48 to the position of “hot water supply / shower”. In this state, when the hot-water tap 9 is opened and water begins to flow through the water supply passage 8, the low pressure due to the pressure loss generated when the water passes through the passages 16 and 18 from the primary chamber 13 a of the diaphragm case 13. The pressure is transmitted to the diaphragm secondary chamber 13b through the passage 16, and the pressure difference from the primary chamber 13a (high pressure) acts as a load depending on the area of the diaphragm 14, and the diaphragm 14 moves to the secondary chamber 13b side.

  As a result, the water pressure automatic gas valve 33 connected to the diaphragm 14 is opened, fuel gas is supplied to the hot water supply main burner 10 through the gas passage 32, and the hot water supply main burner 10 is ignited from the ignition of the pilot burner 38. That is, in the hot water supply main burner 10, the differential pressure between the diaphragm primary chamber 13a and the secondary chamber 13b becomes equal to or greater than a predetermined value due to the amount of water flowing (introduced into the combustion device) when the hot water tap 9 is opened. When it starts to burn. The water passing through the hot water supply heat exchanger 7 is heated by the combustion of the hot water supply main burner 10 and discharged from the hot water discharge pipe 30 (or the shower side passage 31).

  In the characteristic line a in FIG. 6, the water supply connection port 60 passes through the inlet 59 of the water pipe 57, passes through the water inlet 1 of the main heat exchange pipe 4, and goes to the water outlet 2 of the main heat exchange pipe 4. The hot water temperature in the hot water supply heat exchanger 7 along the flowing direction of the flowing water is schematically shown. As indicated by this characteristic line a, the water heated through the hot water supply heat exchanger 7 is also endothermic (heated) even though it passes through the water pipe 57, but most of it (for example, about 80%) is finned. Heat is absorbed through the main heat exchange line 4 in which 3 is disposed.

  Further, in this combustion apparatus, the appliance plug knob 48 shown in FIG. 4 is placed in a state in which hot water or water is put up to a position higher by, for example, 10 cm or more than the connecting portion (upper circulation port) of the bathtub hot water circulation pipe to the bathtub. By adjusting to the position of “Buro”, the fuel gas is supplied to the bath main burner 39 through the passage 36, ignites the bath main burner 39 from the opening of the pilot burner 38, and circulates through the bath heat exchanger 40 to tub The inside hot water is heated.

  In this type of combustion apparatus, after the hot water supply main burner 10 and the bath main burner 39 stop burning, the fire extinguishing operation is performed, that is, the appliance plug knob 48 is “fire extinguished” from the “flame” position. The combustion of the pilot burner 38 continues until it is returned to the position.

Japanese Patent No. 368879 JP 55-65885 A

  By the way, in the combustion apparatus as described above, when the hot water tap 9 is closed to stop the hot water supply, the amount of heat held in the cylinder 56 and the fin 3 is mainly transmitted from the fin 3 to the main heat exchange line 4 during the hot water standby. A so-called post-boiling phenomenon occurs in which hot water in the main heat exchange pipe 4 is heated. Note that the degree of post-boiling (temperature rise) and the time at which post-boiling has occurred vary depending on the temperature of the hot water before the hot water stop, the hot water time, etc., but when a short time elapses, for example, 1 minute immediately after the stop of combustion. At the time of short time standby, as shown by the characteristic line b in FIG. 6, the main heat exchange pipe 4 as a whole absorbs heat from the fins 3 and the hot water temperature in the main heat exchange pipe 4 is in the hot water ( (See characteristic line a)) (after-boiling due to the amount of heat retained by the hot water supply heat exchanger 7 as a whole occurs).

  Moreover, in the combustion apparatus such as the balance-type bath kettle, the pilot burner 38 continues to burn even after the hot water supply main burner 10 is stopped when the hot water supply is stopped. The fin portion P in the portion directly above (directly above) the hot water supply main burner 10 near the pilot burner 38 shown in FIG. 3 is continuously heated by the flame of the pilot burner 38, and the fin 3 of the fin portion P enters the main heat exchange pipe 4. Since the heat is transmitted and the hot water in the main heat exchange pipe 4 is heated, the hot water temperature on the outlet 2 side of the main heat exchange pipe 4 is further increased (pilot boiling occurs, and the characteristics shown in FIG. As in the peak Pb of the line b, the hot water temperature in the main heat exchange pipe 4 of the fin portion P becomes higher).

  And since the high temperature hot water (high temperature hot water whose peak temperature is Pb) on the side of the water outlet 2 of the main heat exchange pipe 4 stays in the vicinity of the water outlet 2, There will be a possibility that the user will be burned because the hot water will be discharged from the second side. The temperature rise due to the continued combustion of the pilot burner 38 is determined by the balance between the amount of heat input from the pilot burner 38 and the amount of heat released as exhaust gas.

  Further, when a long time such as 60 minutes elapses from the stop of the hot water supply, the heat of the fins 3 of the fin portion 61 is cooled as a whole, but the combustion of the pilot burner 38 is continued even after the hot water supply main burner 10 is stopped as described above. In the type of combustion apparatus, since the fin 3 of the fin portion P immediately above the hot water supply main burner 10 near the pilot burner 38 is continuously heated by the flame of the pilot burner 38, the main heat exchange pipe 4 is connected to the fin 3. Endothermic heat is generated for a long time (after pilot boiling is performed for a long time). And since the hot water whose temperature has been increased by the endothermic heat is discharged from the outlet 2 side of the main heat exchange pipe 4 as it is as described above, the hot water is discharged immediately after the re-watering. There is a possibility of bearing.

  In any case, if hot water having a temperature significantly higher than the set temperature is discharged even if the user is not burned, the user will feel uncomfortable, It is desired to make the peak of the hot water temperature (which is higher than the temperature) as low as possible.

  Furthermore, in the conventional combustion apparatus, the hot water supply main burner 10 is formed by providing a plurality of combustion surfaces 10A, 10B, and 10C arranged in parallel in the direction in which the hot water supply main burner 10, the pilot burner 38, and the bath main burner 39 are arranged in parallel. The combustion surface to be combusted is selectively controlled as necessary. For example, the combustion heat is burned on a plurality of combustion surfaces, for example, all the combustion surfaces 10A, 10B, and 10C are combusted. Compared to heating the entire exchange line 4 (or many of the main heat exchange lines 4), when only the combustion surface 10A is burned, the region of the main heat exchange line 4 heated by the combustion ( The hot water temperature in the shaded area in FIG. 7 may be increased.

  As shown in FIG. 8A, for example, a spring 17 for preventing boiling is inserted into the main heat exchange pipe 4 to form a turbulent flow in the main heat exchange pipe 4 to stir the hot water and hot water. In the conventional combustion apparatus, the water outlet 2 of the main heat exchange pipe 4 is provided immediately above the hot water supply main burner 10 near the pilot burner 38. Therefore, as described above, when only the combustion surface 10A closest to the pilot burner 38 is combusted, the hot water heated by the combustion surface 10A and having a high temperature becomes the outlet of the main heat exchange pipe 4. Since the stirring effect cannot be sufficiently exhibited (the stirring length is insufficient), the heated hot water H is heated to the main heat as shown in FIG. Cold water C that passes through the inner wall surface of the exchange line 4 and is not heated is the main heat exchange line Through the central portion of the main heat exchange pipes 4 from the water inlet 1 side may flow to the water outlet 2 side.

  Then, as shown by an arrow C in FIG. 8 (c), cold water having an incoming temperature of, for example, 18 ° C. comes out from the center of the shower head 72 at the tip of the shower side passage 31. As indicated by H, hot water may be poured out, which will cause discomfort to the user.

  The present invention has been made to solve the above-mentioned problems, and the object thereof is a combustion apparatus having a configuration in which combustion of a pilot burner adjacent to a hot water supply main burner is continued even after combustion of the hot water supply main burner is stopped. When hot water is discharged at the time of re-watering after the hot water supply is stopped, or when a shower passage is provided at the hot water supply destination, temperature variation due to the location in the shower head of hot water discharged from the shower head is prevented. An object of the present invention is to provide a combustion apparatus that can be used comfortably.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, in the first invention, the hot water supply main burner and the bath main burner are arranged in parallel with each other at intervals, and a pilot burner is provided at the interval, and the pilot burner is ignited by igniting the pilot burner. At least one of the hot water supply main burner and the bath main burner is ignited by the flame, and the main burner is combusted. After the main burner is stopped, the pilot burner is operated until the fire extinguishing operation is performed. A combustion apparatus that continues combustion, wherein a hot water supply heat exchanger is provided on an upper side of the hot water supply main burner, and a bath heat exchanger is provided on an upper side of the bath main burner, and the hot water supply heat exchange A plurality of fins are disposed in the main heat exchange pipe in the chamber in the longitudinal direction of the main heat exchange pipe at intervals, and the main heat exchange pipe is connected to the pyroelectric pipe. After passing through the end of the hot water supply heat exchanger just above the hot water supply main burner close to the toburner, toward the end of the hot water heat exchanger on the opposite side away from the pilot burner, in the hot water supply heat exchanger The water inlet of the main heat exchange pipe is formed at the end of the hot water heat exchanger just above the hot water main burner near the pilot burner, and the main heat exchange pipe A structure in which a water outlet of the road is formed at an end of the hot water supply heat exchanger on the opposite side away from the pilot burner serves as means for solving the problem.

  In addition to the configuration of the first aspect of the invention, the second hot water supply main burner has a plurality of combustion surfaces arranged side by side in the juxtaposition direction of the hot water supply main burner, the pilot burner, and the bath main burner. In the combustion of the hot water supply main burner, at least the combustion surface closest to the pilot burner among the plurality of combustion surfaces is combusted.

  According to the present invention, the main heat exchange pipe in the hot water supply heat exchanger provided on the upper side of the hot water supply main burner has a plurality of fins arranged at intervals in the longitudinal direction of the main heat exchange pipe. However, the main heat exchange line passes through the end (water inlet side) of the hot water heat exchanger immediately above the hot water main burner near the pilot burner, and then the opposite side away from the pilot burner. Since the hot water supply heat exchanger is arranged in a meandering manner toward the end side (water outlet side) of the hot water supply heat exchanger, until the fire extinguishing operation is performed after the hot water supply main burner combustion is stopped. Even if combustion of the pilot burner continues in the meantime and the hot water supply heat exchanger just above the pilot burner is heated by the heat, the heat is heated on the inlet side of the main heat exchange line.

  Since the hot water on the water inlet side of the main heat exchange conduit is stopped and staying in the state where only a part of the fin arrangement part has passed before the hot water stop, originally the hot water temperature After the hot water supply is stopped, the main heat exchange line absorbs heat from the fins, and the hot water temperature in the main heat exchange line is higher than that in the hot water at each position. Is lower than the temperature of hot water on the outlet side of the main heat exchange line. Even if the lower temperature hot water (hot water on the inlet side of the main heat exchange pipe) absorbs heat from the fins due to the continued combustion of the pilot burner, the peak temperature is the same as in the conventional case. Compared to the configuration where the water outlet side of the road is formed closer to the pilot burner. Moreover, the hot water on the inlet side of the main heat exchange pipe passes through the main heat exchange pipe while passing through the main heat exchange pipe, and the heat of the post-boiling due to the heating of the pilot burner is diffused to reach the outlet side of the main heat exchange pipe As the water is cooled and discharged, the outlet side of the main heat exchange line is formed closer to the pilot burner, and the hot water heated by the pilot burner is reheated without cooling. The hot water temperature can be lowered.

  Further, even when a long time such as 60 minutes elapses from the stop of the hot water supply and the heat of the plurality of fins arranged in the hot water supply heat exchanger is cooled as a whole, the pilot burner after the hot water supply main burner is stopped after combustion is stopped. As the combustion continues, the fins directly above the hot water supply main burner on the pilot burner side continue to be heated, and heat is absorbed from the fins to the main heat exchange line, resulting in a higher temperature. After the hot water on the inlet side of the heat exchange line passes through the main heat exchange line and reaches the outlet side of the main heat exchange line, the heat of the post-boiling by the pilot burner is diffused and cooled. Since the hot water is discharged, it is possible to prevent hot water from being discharged when the hot water is discharged again.

  Further, the hot water supply main burner is formed by providing a plurality of combustion surfaces arranged side by side in the direction in which the hot water supply main burner, the pilot burner, and the bath main burner are arranged side by side. In the case where at least the combustion surface closest to the pilot burner is configured to burn, as described above, a plurality of combustion surfaces are combusted as necessary, or only the combustion surface closest to the pilot burner is used. In the case of combustion only on the combustion surface closest to the pilot burner, the hot water temperature in the main heat exchange line in the region heated by the combustion may be increased. Also in this case, in the present invention, hot water that has become hot due to combustion only on the combustion surface closest to the pilot burner, meanders through the main heat exchange line during main reheating. Agitating (for example, by the action of a spring or the like provided in the main heat exchange pipe) while moving toward the water outlet side of the exchange pipe, the temperature is made uniform, and hot water is discharged from the water outlet of the main heat exchange pipe. it can.

  In other words, even if, for example, a spring is inserted into the main heat exchange pipe and the hot water passing through the main heat exchange pipe is agitated and the hot water temperature is made uniform, the hot water temperature is made uniform. In the configuration in which the water outlet of the main heat exchange pipe is provided immediately above the hot water supply main burner, when only the combustion surface closest to the pilot burner is burned, the effect of stirring cannot be sufficiently exhibited. (Insufficient length of stirring), for example, heated hot water passes through the inner wall surface side of the main heat exchange line, and unheated water flows from the inlet side of the main heat exchange line to the main heat exchange line. Although it flows to the outlet side of the main heat exchange pipe through the center, cold water may come out from the center of the shower head, and hot water may be discharged from the surroundings. , Such temperature unevenness can be suppressed and the user can use it comfortably. It is possible to provide a combustion apparatus.

It is a typical block diagram which shows the structure of the hot water supply heat exchanger in one Example of the combustion apparatus which concerns on this invention with the periphery structure. It is a graph for demonstrating the temperature of the hot water which passes the hot water supply heat exchanger provided in the combustion apparatus of an Example, and the temperature at the time of hot water supply standby, and re-hot water. It is a graph for demonstrating the time change of the tapping temperature in the combustion apparatus of an Example compared with a prior art example. It is explanatory drawing which shows the system structural example of a combustion apparatus. It is a typical block diagram which shows the structure of the hot water supply heat exchanger provided in the conventional combustion apparatus with the periphery structure. It is a graph for demonstrating the temperature of the hot water which passes the hot water supply heat exchanger provided in the conventional combustion apparatus, and the temperature at the time of hot water supply standby, and re-hot water. It is a schematic diagram for demonstrating the area | region of the main heat exchange line heated by the combustion of the combustion surface nearest to the pilot burner in the hot water supply main burner. It is a schematic diagram for demonstrating the problem which arises when the hot water supply main burner which has a some combustion surface is applied to the conventional combustion apparatus, and only the combustion surface from a pilot burner is burned.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same reference numerals are assigned to the same name portions as those in the conventional example, and the duplicate description is omitted or simplified.

  The combustion apparatus of the present embodiment has a system configuration similar to that of the combustion apparatus shown in FIG. 4 and is formed in substantially the same manner as the conventional combustion apparatus. In this embodiment, the characteristic of the combustion apparatus shown in FIG. The configuration of the hot water supply heat exchanger 7 is provided. That is, in the present embodiment, the water inlet 1 of the main heat exchange conduit 4 in the hot water heat exchanger 7 is formed at the end of the hot water heat exchanger 7 immediately above the hot water main burner 10 near the pilot burner 38, The outlet 2 of the main heat exchange line 4 is formed at the end of the hot water supply heat exchanger 7 on the opposite side away from the pilot burner 38, and the main heat exchange line 4 is a hot water supply main burner near the pilot burner 38. After passing through the end of hot water supply heat exchanger 7 immediately above 10, the inside of hot water heat exchanger 7 snakes toward the end of hot water supply heat exchanger 7 on the opposite side away from pilot burner 38. It is arranged by.

  The present embodiment is configured as described above. The characteristic line a in FIG. 2 passes through the inlet 59 of the water pipe 57 from the water supply connection port 60 and passes through the water inlet 1 of the main heat exchange pipe 4. The hot water temperature in the hot water supply heat exchanger 7 along the flow direction of the water flowing to the water outlet 2 of the heat exchange pipe 4 is schematically shown. The characteristic line a in FIG. 2 is the same as the characteristic line a shown in FIG. 6, but in this embodiment, as shown by the characteristic line b in FIG. The hot water temperature by the place in 7 and the peak at the time of re-draining will be in a different state from the conventional example.

  That is, also in the present embodiment, when a short time elapses (for example, 1 minute) immediately after the combustion is stopped, the entire main heat exchange line 4 is disengaged from the fin 3 as shown by the characteristic line b in FIG. Although the heat is absorbed, the hot water temperature in the main heat exchange line 4 becomes higher than that during the hot water (see characteristic line a), but the combustion of the pilot burner 38 continues after the hot water supply main burner 10 is stopped due to the hot water stoppage. Since the fin part P heated by the side is close to the water inlet 1 of the main heat exchange line 4, the hot water temperature originally retained is low (see the characteristic line a in FIG. 2) and is increased by post-boiling. Even if it is, the temperature is low compared with the water outlet 2 side of the main heat exchange conduit 4. Therefore, even if the low-temperature hot water absorbs heat from the fins 3 of the fin portion P due to the continued combustion of the pilot burner 38, the peak temperature Pb is also low (both pilot boiling is small).

  Moreover, in this embodiment, the hot water on the water inlet side of the main heat exchange pipe 4 passes through the main heat exchange pipe 4 while meandering and reaches the water outlet 2 side of the main heat exchange pipe 4. In the meantime, the heat of the post-boiling due to the heating of the pilot burner 38 is diffused and cooled to be discharged, so that the rise in hot water temperature (difference from the set temperature) at the time of re-draining can be kept low. That is, in this embodiment, as in the conventional example, heat is absorbed from the fins 3 by the continuous combustion of the pilot burner 38 on the outlet 2 side of the main heat exchange pipe 4, and the hot water is not cooled as it is. Compared to the configuration, the re-watering temperature can be significantly lowered.

  For example, in FIG. 3, an example of the elapsed time of the tapping temperature in the combustion apparatus of the present embodiment is shown in the characteristic line A in comparison with the conventional example (characteristic line B). In the prior art, the primary peak of post-boiling considered to be caused by pilot post-boiling was 24 ° C. higher than the set temperature (41 ° C. here) (see Bp). The temperature could be suppressed only by 6 ° C. higher than the set temperature (see Ap), and the temperature of the primary peak could be lowered by 18 ° C. compared to the conventional example. In FIG. 3, P burner indicates the pilot burner 38, and the secondary peak (secondary peak) shown in FIG. 3 is due to ignition of the hot water supply main burner 10 during re-heating.

  Further, as in the present embodiment, among the combustion surfaces 10A, 10B, and 10C arranged side by side of the hot water supply main burner 10, only the combustion surface 10A is combusted, and the heating temperature (shown in the hatched portion in FIG. 7). 8 (a) and 8 (b) in the conventional example, as described above, in the case where the hot water temperature in the main heat exchange pipe 4 disposed at a position corresponding to the combustion surface 10A is increased. As shown in Fig. 4, even if the spring 17 is inserted into the main heat exchange line 4 to stir the hot water passing through the main heat exchange line 4, the effect of the agitation cannot be sufficiently exerted (the length of the agitation is Insufficiently, heated hot water H passes through the inner wall surface side of the main heat exchange pipe 4, and unheated cold water C flows through the center of the main heat exchange pipe 4 to the outlet 2 side. The temperature of the hot water discharged from the shower head 72 is adjusted to the temperature of the water outlet in the shower head 72. The temperature unevenness occurs due to location, in the present embodiment, it is possible to suppress such temperature unevenness.

  In other words, in the present embodiment, the main heat exchange line 4 is separated from the pilot burner 38 after passing through the end (water inlet side) of the hot water supply heat exchanger 7 immediately above the hot water supply main burner 10 near the pilot burner 38. Since the inside of the hot water supply heat exchanger 7 is meandering toward the end side (water outlet side) of the hot water supply heat exchanger 7 on the opposite side, one combustion on the side closest to the pilot burner 38 is arranged. Even if the hot water temperature in the main heat exchange pipe 4 (see the hatched portion in FIG. 7) in the region heated by the combustion of the combustion surface 10A is increased by the combustion of only the surface 10A, the hot water is the main heat. When flowing while meandering to the water outlet side of the exchange pipe 4, hot water with sufficient agitation and uniform temperature is discharged, so that the user can use it comfortably.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, the number of times of meandering of the main heat exchange pipe 4 in the configuration of the hot water supply heat exchanger 7 is not particularly limited, and is appropriately set. Moreover, if the position structure of the water inlet 1 side and the water outlet 2 side of the main heat exchange pipe 4 in the hot water supply heat exchanger 7 is formed as in the above-described embodiment, the structure of the other water pipe 57 is particularly It is not limited and is set appropriately.

  Moreover, in the said Example, the hot water supply main burner 10 had three combustion surfaces 10A, 10B, 10C, However, The number and form of the combustion surface of the hot water supply main burner 10 are not specifically limited, One However, it may be more than one.

  Further, according to the present invention, the hot water supply main burner 10 and the bath main burner 39 are arranged in parallel with each other at intervals, and a pilot burner 38 for fire is provided at the interval, and the pilot burners 38 to the main burners 10 and 39 are provided. The combustion of the pilot burner 38 is continued until the fire extinguishing operation is performed even after the main burner combustion is stopped, for example, as applied to the above embodiment. If it has the characteristic hot water supply heat exchanger 7, the details of the system configuration of the combustion device are not particularly limited, and are set as appropriate.

  Furthermore, although the said Example was made into the gas combustion type combustion apparatus, this invention is applicable also to the combustion apparatus which burns other fuels, such as petroleum.

  INDUSTRIAL APPLICABILITY The present invention can be used as a combustion device that is easy to use because hot water having a high temperature can be prevented from being discharged or temperature unevenness can be prevented during re-bathing.

DESCRIPTION OF SYMBOLS 1 Water inlet 2 Water outlet 3 Fin 4 Main heat exchange line 7 Hot water supply heat exchanger 10 Hot water supply main burner 10A, 10B, 10C Combustion surface 38 Pilot burner 39 Bath main burner 40 Bath heat exchanger

Claims (2)

  A hot water supply main burner and a bath main burner are juxtaposed at intervals, and a pilot burner is provided at the interval, and the hot water supply main burner is ignited by the pilot burner ignited by the flame of the pilot burner. A combustion apparatus that ignites at least one of the flame outlets of the bath main burner to perform combustion of the main burner and continues combustion of the pilot burner until the extinguishing operation is performed even after the main burner combustion is stopped. A hot water supply heat exchanger is provided on the upper side of the hot water supply main burner, a bath heat exchanger is provided on the upper side of the bath main burner, and a main heat exchange line in the hot water supply heat exchanger. Are provided with a plurality of fins spaced apart from each other in the longitudinal direction of the main heat exchange pipe, and the main heat exchange pipe is connected to the hot water supply near the pilot burner. After passing through the end of the hot water supply heat exchanger immediately above the inverter, the inside of the hot water supply heat exchanger is meandered toward the end of the hot water supply heat exchanger opposite to the pilot burner. A water inlet of the main heat exchange pipe is formed at an end of a hot water heat exchanger immediately above the hot water main burner near the pilot burner, and a water outlet of the main heat exchange pipe is the A combustion apparatus, wherein the combustion apparatus is formed at an end of the hot water supply heat exchanger on the opposite side away from the pilot burner.   The hot water supply main burner has a plurality of combustion surfaces juxtaposed in the juxtaposition direction of the hot water supply main burner, the pilot burner, and the bath main burner, and at least the pilot of the plurality of combustion surfaces during combustion of the hot water supply main burner The combustion apparatus according to claim 1, wherein the combustion surface on the side closest to the burner is configured to perform combustion.

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