JP2008170097A - Combustion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion apparatus preventing exhaust gas generated in a combustion chamber from flowing to the drain neutralizer side provided outside an instrument. <P>SOLUTION: A burner 1, a main heat exchanger 4 and a heat exchanger 6 for latent heat recovery are provided in the combustion chamber 20. A drain lead-out line 33 leading drain generated in the heat exchanger 6 for latent heat recovery, to the drain neutralizer provided outside a case 40, and an exhaust gas water-sealing unit 7 sealing exhaust gas flowing with drain from the combustion chamber 20 side to the drain lead-out line 33 side, with drain to prevent the exhaust gas from flowing to the drain neutralizer side, are provided outside the combustion chamber 20. The sum of water level pressure of overflow height from an outflow side part of a first drain storage tank 11 to an inflow side part of a second drain storage tank 12 forming the water sealing unit 7, and water level pressure of overflow height from an outflow side part of the second drain storage tank 11 to the drain lead-out line 33, are set as the water level pressure of water sealing for preventing exhaust gas from flowing to the drain neutralizer side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combustion apparatus provided with a heat exchanger for recovering latent heat.

  FIG. 7 shows a general conventional example of a bath apparatus installed in a bathroom. In this conventional bath apparatus, a bathtub 26 and a balance bath 45 are provided side by side in a bath installation space 52, and a supply / exhaust tube 50 of the balance bath 45 is installed in a wall hole 16 of the bathroom wall 10. However, when the balance bath 45 and the bathtub 26 are arranged in parallel in the relatively small bath installation space 52 as described above, the bathtub 26 must be made small in size, so that the bathtub 26 is bathed in a tight posture. I had to do it and I couldn't enjoy bathing in a relaxed mood.

  Therefore, at the time of replacement of the balance bath 45, the user purchases a water heater having an automatic hot water filling function instead of the balance bath 45, for example, and as shown in FIG. It is possible to improve the living environment by fitting and installing in the wall hole 16 where the air supply / exhaust tube 50 has been installed so far, and installing the bathtub 26 which is larger by the space of the balance bath 45 in the bath installation space 52. Has been done. In addition, the code | symbol 18 in FIG. 6 shows the mixing faucet attached to the apron of the bathtub 26. FIG.

  Various configurations of water heaters have been proposed and put into practical use, and an example thereof is schematically shown in FIG. (For example, refer to Patent Document 1). In the figure, a burner 1 is disposed in a combustion chamber 20 provided in a case (instrument case) 40, and a gas pipe 42 for supplying fuel to the burner 1 is connected to the burner 1. Reference numeral 42 denotes an on-off valve (not shown) for controlling supply / stop of fuel to the burner 1 and a proportional valve (not shown) capable of controlling the amount of fuel supplied to the burner 1 with the valve opening. And are installed.

  A combustion fan 5 that supplies and exhausts combustion of the burner 1 is provided below the burner 1. This water heater supplies air that is sucked from the outside to the burner 1 by the rotation of the combustion fan 5, performs burner combustion with this air and gas supplied through the gas pipe 42, and is generated by the burner combustion. The combustion gas is sent from the combustion chamber 20 to the exhaust port 8 side and exhausted by the rotation of the combustion fan 5.

  Above the burner 1, a main heat exchanger (primary heat exchanger) 4 that recovers sensible heat in the combustion gas of the burner 1, and a flow of the combustion gas downstream from the main heat exchanger 4. Latent heat recovery heat exchangers (secondary heat exchangers) 6 that are provided on the side and recover the sensible heat and latent heat of the combustion gas are arranged at intervals. Each of the heat exchangers 4 and 6 includes, for example, metal heat receiving pipes 34 and 36 through which water that receives the heat of the combustion gas of the burner 1 passes, and the heat receiving pipes 34 and 36 outside the heat receiving pipes 34 and 36. 36 and a plurality of fins 35 and 37 provided substantially perpendicularly, and the fins 35 and 37 are provided at intervals. Some of the water heaters 17 include the latent heat recovery heat exchanger 6 that does not have the fins 37.

  A water supply pipe 46 that leads water from the water supply source to the latent heat recovery heat exchanger 6 is connected to the inlet side of the latent heat recovery heat exchanger 6. The inlet side of the heat exchanger 4 is connected via a connecting pipe 48. A hot water supply pipe 47 is connected to the outlet side of the main heat exchanger 4. In FIG. 6, the water supply pipe 46, the hot water supply pipe 47, and the connection pipe 48 are schematically shown by linear arrows. However, the water supply pipe 46, the hot water supply pipe 47, and the connection pipe 48 circulate water. For example, the cross section is formed by a circular pipe.

  Normally, the water supply pipe 46 has a water thermistor (not shown) that detects the temperature of water supplied from the water supply pipe 46 and flows into the latent heat recovery heat exchanger 6, and the water that flows into the latent heat recovery heat exchanger 6. The hot water supply pipe 47 is provided with a hot water thermistor (not shown) capable of detecting the temperature of the hot water flowing out.

  When a hot water filling pipe (not shown) is connected to the hot water supply pipe 47 so that the hot water filling can be performed on the bathtub 26 via the hot water supply pipe 47, the hot water supply capable of automatic hot filling to the bathtub 26 is provided. If a hot water reheating function is provided in this water heater, a composite water heater capable of reheating the bathtub can be formed. In addition, although various things have been proposed for these automatic hot water filling configurations and their functions, and bath hot water replenishing configurations and their functions, they are well known and will not be described in detail here.

  In a combustion apparatus such as a water heater having the latent heat recovery heat exchanger 6, it is necessary to recover the drain (condensed water droplets) generated in the latent heat recovery heat exchanger 6 and discharge it to the outside of the case 40. In this example, a drain receiving tray 43 is provided below the latent heat recovery heat exchanger 6, and the drain accumulated in the receiving tray 43 is discharged to the outside of the case 40 through the drain pipe 44. In addition, since drain contains nitrogen oxide (NOx), sulfur oxide (SOx), etc. in combustion gas, it is strong acidity of pH 2-4, for example, what granulated calcium carbonate etc., etc. are mixed with drain. Need to be neutralized. Drain becomes neutral calcium nitrate by reacting with calcium carbonate.

  Combustion control of the burner 1 and rotation control of the combustion fan 5 are performed according to a sequence program given in advance by a combustion control device (not shown) based on detection signals of the sensors, As described above, the burner 1 is combusted by the gas supplied from the gas pipe 42 and the air sent by the combustion fan 5. As the burner 1 burns, the hot water heater passes through the water supply pipe 46 through the latent heat recovery heat exchanger 6 and the main heat exchanger 4 in order to make hot water. It has a hot water supply function that leads the hot water first.

  In the water heater provided with the latent heat recovery heat exchanger 6, the high-temperature combustion gas from the burner 1 is disposed from the upper side of the burner 1 to the main heat exchanger 4, for example, as shown by the broken line arrow in FIG. 4. In this example, it passes from the horizontal direction side to the arrangement region side of the latent heat recovery heat exchanger 6. And the combustion gas which passed the arrangement | positioning area | region of the heat exchanger 6 for latent heat collection | recovery is exhausted from the exhaust port 8 side.

  Then, while the combustion gas passes through the main heat exchanger 4, heat exchange is performed between the combustion gas and water supplied to the main heat exchanger 4, and sensible heat of the combustion gas is recovered. . Further, while the combustion gas that has passed through the main heat exchanger 4 passes through the latent heat recovery heat exchanger 6, heat exchange is performed between the combustion gas and water supplied to the latent heat recovery heat exchanger 6. Thus, the sensible heat and latent heat of the combustion gas are recovered.

  The latent heat recovery of the combustion gas by the latent heat recovery heat exchanger 6 is performed by bringing the combustion gas containing water vapor into contact with the low temperature heat transfer surface below the saturation temperature to condense the water vapor in the combustion gas. That is, it recovers the latent heat of condensation that occurs when water vapor condenses, and usually recovers the enthalpy of the water vapor of the combustion gas that is discharged out of the combustion system such as a water heater as the combustion gas. is there.

  Thus, in a combustion apparatus such as a water heater equipped with the latent heat recovery heat exchanger 6, when the combustion gas resulting from the combustion of the burner 1 passes through the latent heat recovery heat exchanger 6, the latent heat recovery heat exchanger 6. When the water passing through the inner water pipe takes away the latent heat held by the water vapor in the combustion gas (recovers the latent heat) to increase the temperature, and further passes through the main heat exchanger 4, the combustion thermal power of the burner 1 Since it is heated to produce hot water having a set temperature, the burner 1 can perform efficient heating.

  That is, by providing the heat exchanger 6 for recovering latent heat, for example, in a water heater, the thermal efficiency reaches about 90% or more on a high heating value (total heating value) basis, and the heat exchanger 6 for recovering latent heat is provided. High thermal efficiency is achieved compared to a normal water heater without. Therefore, not only when a new combustion device is installed, but also when the combustion device is replaced, such as when the balance bath 45 is replaced, the combustion device provided with the latent heat recovery heat exchanger 6 is applied. Is being considered.

Japanese Patent Application Laid-Open No. 10-300241

  However, for example, in public housing and apartment buildings, the outer wall of the bathroom often faces a shared part such as a veranda. If liquid drainage flows outside the outer wall of the bathroom, the user is very I feel uncomfortable. Thus, for example, when the balance bath 45 is replaced, as shown in FIG. 6, when the hot water heater 17 or the like is disposed on the bathroom wall 10, the drain neutralizer 3 is connected to the bathroom as shown in FIG. It is conceivable that the drain that is disposed in the water 30 and flows out from the water heater 17 is led to the drainage port (bathroom drainage port 15) of the bathroom 30 through the drain neutralizer 3.

  In this case, since the exhaust gas in the combustion chamber 20 flows to the drain neutralizer 3 side together with the drain, the drain neutralizer 3 is configured to prevent the exhaust gas from flowing into the bathroom 30, for example, An exhaust water seal configuration is required.

  However, even if an exhaust water seal structure is provided on the drain neutralizer 3 side, for example, the contractor does not mistakenly connect the drain neutralizer 3 to the water heater 17, or the water heater 17 and the drain neutralizer 3 Even if the connection of the water heater 17 and the drain neutralizer 3 is correctly performed, the connection pipe made of rubber, for example, has deteriorated over time and the connection pipe is punctured or is cleaned If the connecting pipe deteriorates and a hole is formed due to the chemical applied to the gas, the exhaust gas may leak into the bathroom 30. If the exhaust gas leaks into the bathroom 30, the air in the bathroom 30 becomes dirty, and in some cases, there is a possibility of danger.

  The present invention has been made to solve the above-described problems, and its purpose is to provide exhaust to a bathroom or the like even when the combustion device and the drain neutralizer are not properly connected. An object of the present invention is to provide a combustion apparatus that can prevent leakage.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the present invention includes a burner, a main heat exchanger that absorbs sensible heat in the combustion gas of the burner, and the combustion gas in the combustion chamber provided in the case more than the main heat exchanger. A combustion apparatus provided with a latent heat recovery heat exchanger that is provided at a position shifted from the main heat exchanger at a downstream side of the flow and recovers exhaust latent heat, and in the case, the latent heat recovery A drain outlet passage is provided for guiding drain generated in the heat exchanger to a drain neutralizer provided outside the case, and the latent heat recovery heat exchanger is provided outside the combustion chamber in the case. An exhaust water seal is provided on the lower side to prevent exhaust gas from flowing to the drain neutralizer side by water sealing the exhaust gas flowing together with the drain from the combustion chamber side to the drain outlet passage side. With the configuration And a means for solving the problems.

  In addition to the configuration of the first invention, the second invention includes a first drain storage tank, and a second drain storage tank provided in parallel with the first drain storage tank. The first drain storage tank is opened to the upper surface by an inflow side portion having an opening on the upper surface by a partition wall standing from the bottom surface side of the storage tank and a partition wall standing from the bottom surface side of the storage tank. And a drain that is generated in the latent heat recovery heat exchanger flows into the inflow side, and the second drain storage tank is in the second storage tank. The drain wall is partitioned into an inflow side portion of the drain and an outflow side portion of the drain by a partition wall inserted from above, and the inflow side portion and the outflow side portion are separated by a communication portion provided on the lower end side of the partition wall. Are connected, and the drain overflowing from the outflow side of the first drain storage tank is The drain that is introduced into the inflow side of the second drain storage tank and overflows from the outflow side of the second drain storage tank is introduced into the drain lead-out path, and the first drain storage tank The sum of the height water level pressure overflowing from the outflow side portion to the inflow side portion of the second drain storage tank and the height water level pressure overflowing from the outflow side portion of the second drain storage tank to the drain outlet passage It is characterized by the water level pressure of the water seal that prevents the exhaust gas from flowing to the neutralizer side.

  Further, the third invention is characterized in that, in addition to the configuration of the first or second invention, the combustion device is installed in a wall hole formed in a bathroom wall.

  According to the present invention, the main heat exchanger and the latent heat recovery heat exchanger are provided in the combustion chamber in the case, and the drain is led outside the combustion chamber to the drain neutralizer provided outside the case. Although a lead-out path is provided, outside the combustion chamber in the case, the exhaust flowing from the combustion chamber side to the drain lead-out path side together with the drain is sealed with drain, so that the exhaust is sent to the drain neutralizer side. Since the exhaust water sealer that prevents flow is provided, it is possible to prevent the exhaust gas from being sealed in the combustion device and flowing to the outside of the case through the drain lead-out path. Therefore, even if the drain neutralizer and the combustion device are not well connected, it is possible to avoid problems caused by exhaust gas flowing outside the case, for example, flowing into the bathroom.

  Moreover, in this invention, a water sealer has a 1st drain storage tank and the 2nd drain storage tank provided in parallel with this 1st drain storage tank, and the outflow of a 1st drain storage tank The drain overflowing from the side is introduced into the inflow side of the second drain storage tank, and the drain overflowing from the outflow side of the second drain storage tank is introduced into the drain outlet passage. The water level pressure overflows from the outflow side of the first drain storage tank to the inflow side of the second drain storage tank and the drain from the outflow side of the second drain storage tank. By making the sum of the height water level pressures overflowing to the outlet passage the water level pressure of the water seal that prevents the exhaust from flowing to the drain neutralizer side, the water sealing of the exhaust can be performed reliably.

  In addition, when the exhaust is sealed with a water seal equipped with one drain storage tank, the height water level pressure that overflows from the drain outflow side of the drain storage tank to the drain lead-out path is set to the drain neutralizer side. According to the present invention provided with a water seal device in which the first and second drain storage tanks are arranged side by side, the first drain storage tank is required. The sum of the height water level pressure overflowing from the outflow side portion of the second drain storage tank to the inflow side portion of the second drain storage tank and the height water level pressure overflowing from the outflow side portion of the second drain storage tank to the drain outlet passage. The height of the first and second drain storage tanks can be reduced because the water level pressure of the water seal that prevents the exhaust gas from flowing to the drain neutralizer side is sufficient. Therefore, according to the present invention, even if the height of the combustion apparatus is low, the water seal can be arranged below the latent heat recovery heat exchanger, so that the combustion is compact and can sufficiently exhibit the exhaust water sealing effect. A device can be realized.

  Furthermore, the combustion apparatus of the present invention can be used effectively in the bath space by installing it in a wall hole formed in the bathroom wall instead of, for example, a balance bath, and has a heat exchanger for recovering latent heat. In addition, the drain generated in the latent heat recovery heat exchanger can be neutralized by, for example, a drain neutralizer provided in the bathtub, so that it is comfortable and safe. Can be processed.

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

  FIG. 1 shows a configuration of a water heater as an embodiment of a combustion apparatus according to the present invention in a schematic cross-sectional view in which the piping configuration is omitted. As shown in the figure, the water heater 17 of this embodiment is disposed in a wall hole 16 formed in the bathroom wall 10, and the water heater 17 has a length in the horizontal direction that is longer than a length in the vertical direction. Largely formed.

  The water heater 17 according to the present embodiment is a combustion apparatus including the latent heat recovery heat exchanger 6, similar to the water heater shown in FIG. 4, and a burner is provided in the combustion chamber 20 provided in the case 40. 1, a main heat exchanger 4 and a latent heat recovery heat exchanger 6 are provided, but the main heat exchanger 4 and the latent heat recovery heat exchanger 6 are shifted in position (here, , In parallel with the penetration direction of the wall hole 16). The combustion fan 5 is provided on the upper side of the blower chamber 25 adjacent to the region where the burner 1 is arranged, and the air sucked into the case 40 from the intake port 9 as the combustion fan 5 rotates is shown in the figure. As shown by an arrow D, the air enters the inlet side of the combustion fan 5, and the air is sent into the burner 1 as shown by an arrow A in the figure.

  The burner 1 is combusted by the air and the fuel gas sent to the burner 1, and the combustion gas is used as the main heat exchanger 4 and the heat for recovering latent heat as shown by an arrow B in the figure. The gas is exhausted from the exhaust port 8 through the exchanger 6. The recovery of sensible heat and latent heat in the combustion gas by the main heat exchanger 4 and the latent heat recovery heat exchanger 6, the water supply function, the hot water supply function, the hot water filling function, and the like are the same as those of the water heater shown in FIG. There will be no further explanation.

  In the present embodiment, a drain outlet path 33 is provided in the case 40 below the combustion chamber 20. The drain lead-out path 33 removes the drain generated in the latent heat recovery heat exchanger 6 from the drain neutralizer 3 (not shown in the figure) provided outside the case 40 as shown by an arrow C in the figure. ), And the outlet of the drain outlet passage 33 forms the neutralizer connection portion 32. The drain neutralizer 3 is connected to the neutralizer connection portion 32 through appropriate connection means such as a rubber tube.

  In the present embodiment, a characteristic water seal 7 is provided outside the combustion chamber in the case 40 below the latent heat recovery heat exchanger 6. As shown by an arrow B ′ in FIG. 1, a part of the exhaust of the combustion gas flows along with the drain to the lower side of the heat exchanger 6 for latent heat recovery, and the water sealer 7 includes a combustion chamber 20. The exhaust water sealer prevents the exhaust from flowing to the drain neutralizer 3 side through the drain outlet passage 33 by sealing the exhaust gas flowing together with the drain from the side to the drain outlet passage 33 side.

  The water sealer 7 includes a first drain storage tank 11 and a second drain storage tank 12 provided in parallel with the first drain storage tank 11. The first drain storage tank 11 is opened to the upper surface by the inflow side portion 13 having an opening on the upper surface by the partition walls 2a and 2b erected from the bottom surface of the storage tank, and the partition walls 2c and 2d which are also erected from the lower surface of the storage tank. A drain side portion 14 having a section and a U-shaped cross section, and the drain generated in the latent heat recovery heat exchanger 6 flows into the inflow side portion 13. . In addition, on the upper surfaces of the inflow side portion 13 and the outflow side portion 14, for example, as shown in FIG. 2B, an upper plate portion 21a in which one or more (a plurality in this figure) holes are formed may be provided. Good.

  The second drain storage tank 12 is partitioned into a drain inflow side portion 23 and a drain outflow side portion 24 by a partition wall 22 inserted into the second storage tank 12 from an upper height position. The inflow side portion 23 and the outflow side portion 24 communicate with each other by a communication portion 19 provided on the lower end side of the partition wall 22. In this example, the partition wall 22 is extended to a position that is spaced from the bottom surface of the second storage tank 12, and this interval is used as the communication portion 19. However, the communication portion 19 is, for example, the partition wall 22. You may form by the through-hole formed in this. Further, on the upper surfaces of the inflow side portion 23 and the outflow side portion 24, for example, as shown in FIG. 2B, an upper plate portion 21b in which one or more (a plurality in this figure) holes are formed may be provided. .

  In this embodiment, the water sealer 7 is configured such that drain overflowed from the outflow side portion 14 of the first drain storage tank 11 is introduced into the inflow side portion 23 of the second drain storage tank 12, and the second The drain overflowing from the outflow side 24 of the drain storage tank 12 is configured to be introduced into the drain lead-out path 33.

  And the height water level pressure which overflows from the outflow side part 14 of the 1st drain storage tank 11 to the inflow side part 23 of the 2nd drain storage tank 12, and drain from the outflow side part 24 of the 2nd drain storage tank 12 The sum of the height water level pressures overflowing to the outlet path 33 is the water level pressure of the water seal that prevents the exhaust gas from flowing to the drain neutralizer 3 side. Specifically, the water seal height of the first drain storage tank 11 shown in S of FIG. 2A is 37 mm, and the water seal height of the second drain storage tank 12 shown in T of FIG. Is 40 mm. With this configuration, in the present embodiment, the water sealer 7 can satisfactorily seal the exhaust gas.

  In this embodiment, an air passage 31 is formed along the drain outlet passage 33, and this air passage 31 serves to prevent, for example, drain from flowing backward from the water seal 7 to the combustion chamber 20 side. Fulfill.

Below, the function of the water sealer 7 in the present embodiment is specifically shown. For example, in a general house, when the ventilation fan is turned in a kitchen or the like, the pressure in the kitchen becomes -15 mm (negative pressure) as the water level height with respect to 0 when the ventilation fan is not turned. Similarly, the pressure becomes a negative pressure of −15 mm as the water level height. Here, the water level pressure as shown with -15mmH ₂ O, the unit of water pressure, for convenience, will be denoted as mmH ₂ O.

At this time, when the combustion fan 5 of the water heater 17 is rotated, as shown by an arrow D in FIG. 1, intake air flows from the intake port 9 to the combustion fan 5, and this supply passage portion (the combustion chamber 20 in the case 40). The portion extending from the intake port 9 to the air inlet of the combustion fan 5 on the outer side of -5 is −5 to −10 mmH ₂ O. The arrow A in the figure, the flow of air shown in B occur, between the air outlet of the combustion fan 5 to the exhaust port 8, the pressure is 10~15mmH ₂ O. Similarly, as indicated by an arrow B ′, the same pressure (10 to 15 mmH ₂ O) is applied to the water sealer 7, but in the present embodiment, the water in the first drain storage tank 11 of the water sealer 7 is applied. Since the sealing height is 37 mm, the exhaust can be sealed with the first drain storage tank 11 and can be prevented from flowing to the drain outlet path 33 side.

Further, in this embodiment, even when the pressure of the exhaust gas indicated by the arrow B ′ is further increased, the exhaust gas can be sealed with the water sealer 7 as follows. That is, for example, when the outer wall of a house is covered with a vinyl sheet or the like for repair work of a house (for example, an apartment, an apartment, etc.), as described above, a ventilator such as a kitchen is turned on and the water heater 17 is turned on. When the combustion fan 5 rotates and the vinyl sheet completely closes the exhaust port 8 of the water heater 17 due to the influence of wind from the outside, the exhaust in the water heater 17 loses its place. The pressure of the exhaust between the air outlet and the exhaust outlet 8 of the combustion fan 5 becomes as high as about 65 mmH ₂ O.

Then, as shown in FIG. 2A, since the water seal height S of the first drain storage tank 11 of the first drain storage tank 11 is 37 mm, this water seal is broken, but the exhaust is In order to seal the first drain storage tank 11, air bubbles are blown out from the outflow side portion 14 of the first drain storage tank 11. The blowing pressure is 65−37 = 28 mmH ₂ O, and as described above, the portion of the case 40 of the water heater 17 outside the combustion chamber 20 from the intake port 9 to the air inlet of the combustion fan 5 is −5−5. Since it is −10 mmH ₂ O, the blowing pressure from the outflow side part 14 of the first drain storage tank 11 is weakened (below 28 mmH ₂ O), and the inflow side part 23 of the second drain storage tank 12. For example, the pressing force applied to is 10 mmH ₂ O.

On the other hand, as described above, since the pressure in the bathroom 30 is −15 mmH ₂ O, the outflow side portion 24 side of the second drain storage tank 12 is pulled by 15 mmH ₂ O, so that the exhaust is first. The water level pressure that tends to flow from the inflow side portion 23 side to the outflow side portion 24 side of the second drain storage tank 12 is, for example, about 10 + 15 = about 25 mmH ₂ O. Here, in the present embodiment, the water seal height T of the second drain storage tank 12 is 40 mm, so that the exhaust can be sealed with the second drain storage tank 12, and the drain outlet path 33 side has It can be prevented from flowing.

  The present embodiment is configured as described above. By providing the water seal 7 for the exhaust gas flowing to the drain outlet passage 33 side together with the drain in the case 40 of the water heater 7, the exhaust pressure becomes very high. However, since the exhaust can be sealed in the hot water heater 17, even if the drain neutralizer 3 and the hot water heater 17 are not well connected, the exhaust passes through the drain lead-out path 33 and enters the bathroom 30. Can be prevented.

  Further, the water sealer 7 applied to the present embodiment is formed by arranging a first drain storage tank 11 and a second drain storage tank 12 side by side, and the first drain storage tank 11. Height water level pressure that overflows from the outflow side portion 14 of the second drain storage tank 12 to the inflow side portion 13 and height water level pressure that overflows from the outflow side portion 24 of the second drain storage tank 12 to the drain outlet passage 33. Since the exhaust can be sealed with the water level pressure of the water seal that prevents the exhaust from flowing to the drain neutralizer 3 side, the height of the first and second drain storage tanks 11 and 12 , The height of the water sealer 7 can be reduced, and a water heater that is compact and can sufficiently exhibit the water seal effect of exhaust can be realized.

  Further, in this embodiment, a water seal 7 is provided below the latent heat recovery heat exchanger 6 and near the air inlet 9, and the position of the water seal 7 is determined from the combustion fan 5. Since the position is far away, the following effects can be achieved.

  When the water heater 17 is shipped from the factory, it is shipped with no drain in the water seal 7 (the drain generated during the test in the factory is removed). For example, about 1 to 2 minutes from the start of combustion in the trial operation by the burner combustion in a state where there is no drain in the water sealer 7. Therefore, at this time, the water seal of the exhaust gas by the water sealer 7 is not sealed, and the exhaust gas leaked from the water sealer 7 flows backward in the water heater 17 and reaches the combustion fan 5, so-called combustion deterioration phenomenon due to recirculation. Will occur.

  After that, the trial run is continued, drainage accumulates in the water sealer 7, and the water seal of the exhaust gas is performed by the water sealer 7. Therefore, when the user uses the water heater 17, Although there is no possibility that the combustion deterioration phenomenon due to the circulation will occur, it is desired to suppress the occurrence of the combustion deterioration phenomenon due to the recirculation as much as possible even during the trial operation. The negative pressure generated in the water heater 17 by rotating the combustion fan 5 is the largest on the suction port (inlet) side of the combustion fan 5 and the smallest in the vicinity of the intake port 9, causing a deterioration in combustion due to recirculation. In order to suppress as much as possible, it is preferable to provide a water seal 7 in a region where the negative pressure is small, that is, in the vicinity of the intake port 9 (the closer to the combustion fan 5, the greater the negative pressure and the easier it is to recirculate so that the combustion worsens. )

  In the present embodiment, as described above, the occurrence of the combustion deterioration phenomenon due to recirculation can be suppressed as much as possible by setting the position of the water seal 7 close to the intake port 9. This is a feature of the embodiment.

  In addition, this invention is not limited to the said embodiment, It can take various aspects. For example, in the above embodiment, the first drain storage tank 11 of the water sealer 7 is formed so that the cross section is U-shaped, but for example, as shown in FIG. The partition wall 2c is combined to form a partition wall, the inflow side portion 13 and the outflow side portion 14 are partitioned by the partition wall, and the partition wall 2c is communicated via a communication portion provided below the partition wall. Also good.

  Moreover, in the said embodiment example, although the water sealer 7 formed the 1st drain storage tank 11 and the 2nd drain storage tank 12 in parallel, the structure of the water sealer 7 is the said embodiment. For example, if the lower space of the latent heat recovery heat exchanger 6 is wide, as shown in FIG. 3, one drain storage tank 29 is provided and configured. Also good.

  In this case, the height water level pressure overflowing the drain outlet passage 33 of the drain storage tank 29 is made larger than the pressure of the exhaust gas applied from the combustion chamber 20 side to the first drain storage tank 11 side. For this reason, the height of the water sealer 7 is increased accordingly (for example, about 75 mm to 80 mm is required). When the combustion device such as the water heater 17 is provided in the wall hole 16 of the bathroom 30, the height of the water heater 17 must be equal to or less than the height of the wall hole 16, and depends on the latent heat recovery heat exchanger 6. Considering the arrangement space of the latent heat recovery heat exchanger 6 for efficiently performing the latent heat recovery, the first drain storage tank 11 and the second drain storage tank 12 are arranged in parallel as in the above embodiment. It is preferable to form it.

  Furthermore, in the above embodiment, the air passage 31 is formed along the drain lead-out passage 33, but the formation location of the air passage 31 is appropriately set. The air passage 31 prevents the drain from flowing back to the combustion chamber 20 side when the drain neutralizer 3 is connected to the bathroom drain port 15, for example. If there is no character, it can be omitted.

  Furthermore, although the said embodiment demonstrated the gas combustion type water heater 17 as a combustion apparatus, the combustion apparatus of this invention may apply not only a water heater but appropriate combustion apparatuses, such as a bathtub. The combustion method may be an oil combustion type.

  Furthermore, although the example which installs the water heater 17 in the wall hole 16 of the bathroom 30 was described in the said embodiment, the arrangement position of combustion apparatuses, such as the water heater 17, is set suitably.

It is explanatory drawing which shows typically one Embodiment of the combustion apparatus which concerns on this invention. It is sectional explanatory drawing which shows the example of the drain storage tank applied to the combustion apparatus which concerns on this invention. It is explanatory drawing which shows typically the other embodiment example of the combustion apparatus which concerns on this invention. It is explanatory drawing which shows typically an example of the combustion apparatus provided with the heat exchanger for latent heat collection | recovery. It is a schematic diagram for demonstrating the structure which connects a drain neutralizer to a combustion apparatus and arrange | positions in a bathroom. It is explanatory drawing which shows the bathroom structure which removed the balance bath and installed the large bathtub only in the installation space in the bath installation space. It is explanatory drawing which shows the bathroom structure which provided the balance bath pot and the bathtub side by side in the bath installation space.

Explanation of symbols

1 Burner 3 Drain Neutralizer 4 Main Heat Exchanger 5 Combustion Fan 6 Heat Exchanger for Latent Heat Recovery 7 Water Sealer 11 First Drain Reservoir 12 Second Drain Reservoir 13, 23 Inlet Sides 14, 24 Outflow side portion 16 Wall hole 19 Communication portion 22 Partition wall 33 Bathroom 33 Drain outlet path

Claims (3)

  In the combustion chamber provided in the case, a burner, a main heat exchanger that absorbs sensible heat in the combustion gas of the burner, and the downstream of the combustion gas flow from the main heat exchanger Combustion device provided with a main heat exchanger and a latent heat recovery heat exchanger that is provided with a position shifted to recover exhaust latent heat, and is generated in the case by the latent heat recovery heat exchanger A drain lead-out path that guides the drain to be drained to a drain neutralizer provided outside the case, and outside the combustion chamber in the case, below the latent heat recovery heat exchanger, An exhaust water seal is provided that prevents exhaust gas from flowing to the drain neutralizer side by water sealing the exhaust gas flowing together with the drain from the combustion chamber side to the drain lead-out path side. Combustion device.   The water sealer has a first drain storage tank and a second drain storage tank arranged in parallel with the first drain storage tank, and the first drain storage tank stands up from the bottom surface side of the storage tank. A latent heat recovery heat exchanger having an inflow side portion having an opening on the upper surface by the partitioned wall and an outflow side portion having an opening on the upper surface by the partition wall similarly raised from the bottom surface side of the storage tank. The generated drain is configured to flow into the inflow side, and the second drain storage tank is connected to the drain inflow side and the drain outflow by a partition wall inserted into the second storage tank from an upper position. The inflow side portion and the outflow side portion communicate with each other by a communicating portion provided on the lower end side of the partition wall, and overflows from the outflow side portion of the first drain storage tank. The drain is introduced into the inflow side of the second drain storage tank, and the second drain The drain overflowing from the outflow side portion of the water storage tank is introduced into the drain outlet passage, and overflows from the outflow side portion of the first drain storage tank to the inflow side portion of the second drain storage tank. The sum of the height water level pressure to be discharged and the height water level pressure overflowing from the outflow side portion of the second drain storage tank to the drain outlet passage prevents water from flowing to the drain neutralizer side, The combustion apparatus according to claim 1, wherein the combustion apparatus is formed.   The combustion apparatus according to claim 1 or 2, wherein the combustion apparatus is installed in a wall hole formed in a bathroom wall.

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