JP4815779B2 - Water heater - Google Patents

Description

The present invention relates to a hot water supply device that generates hot water by recovering heat from a combustion gas generated by a combustor, and more particularly, a hot water supply type that generates drain (condensate water) by performing heat recovery from a combustion gas. about the equipment.

  As a hot water supply device, there is one provided with a so-called latent heat recovery type heat exchanger (see, for example, Patent Document 1). In this type of hot water supply apparatus, not only the sensible heat of the combustion gas generated by the combustor is recovered by the heat exchanger, but also the latent heat of the combustion gas is recovered. Therefore, the heat exchange efficiency can be increased. When the latent heat is recovered, water vapor in the combustion gas is condensed and a large amount of drain is generated. This drain is generally about PH3 that absorbs sulfur oxide, nitrogen oxide, etc. in the combustion gas. It becomes strongly acidic. If the drain is thrown into a general drainage pipe with strong acidity, the pipe is not only corroded, but also causes environmental deterioration such as water pollution. Therefore, conventionally, a means for neutralizing the drain neutralizer by assembling the drain neutralizer containing the neutralizing agent in the container into the hot water supply device and allowing the drain to flow into the drain neutralizer before discarding the drain is provided. It is used.

  On the other hand, as a hot water supply device, there is one using a combustor that burns fuel oil such as kerosene or light oil. This type of hot water supply device is originally designed so that fuel oil does not leak in the combustor. However, since fuel oil leakage may occur in the combustor due to an unexpected cause such as an earthquake, from the viewpoint of giving a sense of security to the user of the hot water supply device Therefore, it is desired to take appropriate measures such as detecting this and making an emergency stop of the hot water supply device. Therefore, as a means for meeting such a demand, for example, an oil sensor is provided in an appropriate place near or below the combustor, and when a fuel oil leak occurs, the fuel oil is detected by the oil sensor. It is possible to make it.

  However, in the prior art, in the technical field of the hot water supply apparatus, no actual means has been proposed which can reasonably detect such fuel oil leakage with a simple structure. For example, Patent Documents 2 and 3 propose a structure for detecting oil fuel leakage in a boiler or the like equipped with a combustor. However, such a structure does not take into account any structure unique to a hot water supply device. It is not reasonable to apply this as it is to a hot water supply device.

  Considering the case where fuel oil leakage occurs in the hot water supply device, in general, fuel oil leakage occurs in the piping system for fuel supply of the combustor, and the leaked fuel oil is outside the hot water supply device. It is presumed that there are many cases that flow to the part. However, as a mode of fuel oil leakage, in addition to the above, there may be a case where fuel oil leaks into the combustion gas flow path. For example, in the case where a spray nozzle for spraying fuel oil is disposed in the combustion gas flow path, if the spray nozzle or a piping system in the vicinity thereof fails, the fuel oil flows in the combustion gas flow path. On the other hand, it is difficult to detect such a fuel oil leak in the combustion gas flow path depending on the prior art.

JP 2000-356111 A JP-A-1-111133 Japanese Utility Model Publication No. 63-116747

The present invention has been conceived under such circumstances, and even in the unlikely event that a fuel oil leak occurs in a combustor, a hot water supply apparatus that can appropriately detect this with a simple configuration. The challenge is to provide a device.

  In order to solve the above problems, the present invention takes the following technical means.

A hot water supply apparatus provided by the present invention is attached to an upper portion of a can body and connected to a combustor for burning fuel oil, and the lower portion of the can body so as to be positioned below the can body and the can body. A heat exchange having a combustion gas passage formed using a bottom casing and guiding the combustion gas generated by the combustor to an exhaust port, and a water passage tube for exchanging heat with the combustion gas And a drain disposed below the combustor, the can body, and the bottom casing , and generated by the heat exchange and flowing into the bottom casing and received by the bottom plate portion flows into the interior. A hot water supply device comprising a container and a drain neutralizer having a neutralizing agent contained in the container, wherein the fuel oil leaks when the fuel oil leaks in the combustor. Yl along the phenomenon that travels in the interior of the container of the drain neutralizer from being received by the bottom plate portion of the bottom casing flows down the inside of the can body, and an outer surface of the fuel oil is the can body and the casing Of the drain neutralizer vessel , causing at least one of the phenomenon of proceeding to the protruding portion provided so as to protrude from the lower side of the bottom casing to the side thereof. The container is provided with at least one oil sensor capable of detecting fuel oil that has advanced on at least one of the upper wall portion and the inside of the container.

  According to the present invention, the following effects can be obtained.

  First, if a fuel oil leak occurs in the combustor due to a failure of the combustor, the fuel oil travels to the top or inside of the drain neutralizer container, which is detected by the oil sensor. The This detection makes it possible to properly detect the occurrence of fuel oil leakage and take appropriate measures such as an emergency stop of the hot water supply device.

  Secondly, fuel oil is collected when a fuel oil leak occurs using a container of a drain neutralizer. Therefore, it is not necessary to provide an additional member dedicated to collecting fuel oil separately from the container for the drain neutralizer, or the number of members can be reduced, and the space for installing them can also be reduced. It becomes. As a result, it is possible to suppress an increase in manufacturing cost and an increase in the size of the entire apparatus.

Thirdly, according to the present invention, since the drain neutralizer container is used as a container for collecting the fuel oil, the oil leakage flowing down in the can which has been difficult in the prior art Can be accurately detected as required.

  Fourth, since the oil sensor is attached to the container of the drain neutralizer, a dedicated bracket for attaching the oil sensor can be eliminated. Therefore, the number of parts is reduced more thoroughly, which is suitable for reducing the manufacturing cost.

In a preferred embodiment of the present invention, the drain neutralizer, when the fuel oil ran down along the outer surface of the leak from the combustor the can body and the bottom casing, the upper wall portion of the container Among them, when it can be received by the protruding portion provided so as to protrude from the bottom of the bottom casing to the side, and when fuel oil leaks from the combustor and flows down inside the can body , The fuel oil is configured to be able to flow into the container after being received by the bottom plate portion of the bottom casing, and the fuel sensor detects any fuel oil on or inside the top wall of the container. It is possible.

According to such a configuration, fuel oil leakage occurs in the combustor, and this fuel oil can be detected appropriately regardless of whether the fuel oil flows outside or inside the can body. Can do. For this reason, detection of fuel oil leakage is ensured.

In a preferred embodiment of the present invention, the bottom portion so as to stand on the casing provided with the connected exhaust duct to the bottom casing, the combustion gas flow path, the can body, the bottom casing And the exhaust duct is formed by being continuously connected to the inside of the exhaust duct and having made a U-turn in the bottom casing of the combustion gas that has progressed downward from the fuel combustion region of the combustor and into the can body. It is configured to upwardly enters the heat exchanger has a structure in which the tubular body of the passage for water is arranged on at least one of the can body and in the bottom casing, the bottom casing the bottom plate portion, the fuel oil flowed down to the combustion gas flow path and from said combustor when the drain from the tube of the heat exchanger is dropped It is possible to receive them come, the container of the drain neutralizer, a portion thereof disposed below the bottom plate portion, the received by the bottom plate portion drain and unburned fuel oil introduced into together provided so as to be, other portion of said container, said bottom being formed as the protruding portion that protrudes to the side from the bottom of the casing, of the can body and bottom casing leaks from the combustor The fuel oil that has flowed down the external region is received by the protruding portion.

  According to such a configuration, when a drain is generated at the location where the heat exchanger is disposed and an unburned fuel oil flows in the combustion gas flow path, the drain and the fuel oil are separated from the combustion gas. By flowing downward in the flow path, it is received by the bottom plate portion of the bottom casing and is quickly and rationally guided into the container of the drain neutralizer. For this reason, it is possible to prevent these drains and fuel oil from remaining in the combustion gas flow path. On the other hand, when the fuel oil flows outside the combustion gas flow path, it is received using the protruding portion of the drain neutralizer container, so that the fuel oil is accurately collected. The drain neutralizer container is placed under the bottom casing, and its installation space efficiency is good, so even if the drain neutralizer is formed in a large size, the overall size of the device is suppressed. Is possible.

  In a preferred embodiment of the present invention, the whole or a part of the upper surface portion of the protruding portion is a concave shape capable of storing the fuel oil that has progressed to the protruding portion, and the fuel oil that has reached the concave portion is It is configured to be detected by an oil sensor.

  According to such a configuration, since the fuel oil that has traveled on the upper wall portion of the container is stored in the concave portion, the fuel oil flows down to the peripheral portion of the container before being detected by the oil sensor. This is resolved. Therefore, it is more preferable to reliably detect the fuel oil.

  In a preferred embodiment of the present invention, as the oil sensor, a fuel oil which can be detected by only one oil sensor is used for any region of the fuel oil in the container and on the upper wall. It has been.

  According to such a configuration, the number of oil sensors used can be minimized, the component cost can be reduced, and the structure of electrical wiring connected to the oil sensor can be simplified.

  In a preferred embodiment of the present invention, the oil sensor includes a casing for oil permeation and an oil detection unit that detects when fuel oil enters the casing, and the casing of the oil sensor includes: At least a portion is arranged in the container of the drain neutralizer so that the fuel oil existing in the container can enter the casing, and the oil sensor or the container includes the container of the container. Oil guide means for guiding the fuel oil traveling on the upper wall portion into the casing of the oil sensor or the casing is provided.

  According to such a configuration, the fuel oil that has flowed into the drain neutralizer container can be directly detected in the casing of the oil sensor. Further, the fuel oil that has traveled on the upper wall portion of the container can be finally introduced into the casing of the oil sensor by using the oil guide means, and this can also be detected. . Accordingly, it is possible to detect the fuel oil that has progressed to the inside of the container of the drain neutralizer and the upper wall portion without using two oil sensors with a simple configuration.

  In a preferred embodiment of the present invention, the upper wall of the container is provided with an opening through which the casing is inserted so that at least the tip of the casing of the oil sensor is disposed in the flow path. The oil sensor includes a support member that is attached to the periphery of the opening of the upper wall portion and covers the upper surface of the base end portion of the casing, and a region between the support member and the upper wall portion, or The support member is provided with a gap-like or hole-like passage for guiding the fuel oil existing on the upper wall portion or on the support member into the casing or the casing. Oil guide means.

  According to such a configuration, the oil sensor can be appropriately and easily attached to the upper wall portion. The oil present in the flow path can be allowed to enter the casing as it is, while the oil present on the upper wall portion is allowed to enter the casing through the passage and appropriately Can be detected.

  In a preferred embodiment of the present invention, the casing of the oil sensor and the whole of the detection unit are provided in a container of the drain neutralizer, and the oil guide means is an upper wall part of the container. It is provided to guide the fuel oil existing above into the container.

  According to such a configuration, it is possible to appropriately detect the fuel oil on the upper wall portion of the container even though the casing of the oil sensor and the entire detection portion are provided in the container. Moreover, it can be set as the structure where an oil sensor does not protrude on an upper wall part, and it is suitable when such a structure is desired. Furthermore, since the oil sensor has a structure accommodated in the container, it is possible to protect the oil sensor from such a poor atmosphere when the atmosphere outside the container is poor.

  In a preferred embodiment of the present invention, the casing and the detection portion of the oil sensor are provided on an upper wall portion of the container, and the oil guide means extends from the casing into the flow path. And the oil which exists in the said flow path is comprised so that it can raise toward the said casing or a casing.

  According to such a configuration, although the casing of the oil sensor and the detection unit are provided on the upper wall portion of the container, it is possible to appropriately detect the oil in the container. Since the oil sensor is provided outside the flow path forming member, there is an advantage that its mounting, wiring connection, and the like are facilitated.

  In a preferred embodiment of the present invention, the drain neutralizer includes an oil trapping means capable of trapping fuel oil at a portion upstream of the oil sensor in the flow direction of the drain. The oil sensor is configured to detect when a situation occurs downstream without being captured by the means.

  According to such a configuration, the following effects can be obtained. That is, when a combustion failure such as an ignition failure occurs when driving the combustor, unburned fuel oil is generated in the combustion gas flow path and flows into the drain neutralizer together with the drain There is. Since the oil capturing means captures such unburned fuel oil, a small amount of fuel oil generated due to the above-mentioned ignition failure or the like is immediately detected by the oil sensor, and this is a fuel oil leak. There is no or less chance of being mistakenly recognized. Further, since there is no possibility that the above-mentioned unburned fuel oil is discharged to the outside together with the drain, it is preferable for preventing environmental deterioration. On the other hand, the amount of fuel oil that flows into the combustion gas flow path in the event that a combustor fails due to an unexpected cause such as an earthquake and a fuel oil leak occurs, Although it is considered that the amount of oil is so large that it cannot be compared, in this case, it is difficult to capture the entire amount by the oil capturing means. Therefore, when a fuel oil leak occurs, fuel oil flowing to the oil sensor is generated without being captured by the oil capturing means, and this is detected by the oil sensor. As described above, according to the above configuration, unburned fuel oil that is likely to occur during normal operation due to poor ignition or the like is prevented from being detected by the oil sensor, but an abnormal situation of fuel oil leakage should be avoided. If it occurs, it can be accurately detected by the oil sensor.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a hot water supply apparatus according to the present invention. The hot water supply apparatus A of the present embodiment includes a combustor 1, a heat exchanger HT, a bottom casing 3, a silencer 19, a drain neutralizer B1 provided with an oil sensor 5, and an exterior case 90 covering the whole. Yes. The silencer 19 corresponds to an example of an exhaust duct referred to in the present invention.

  The combustor 1 is of a reverse combustion type in which fuel oil such as kerosene is injected downward from the spray nozzle 10 and ignited by the spark plug 12 to burn, and is mounted on the can body 20 of the heat exchanger HT. The spray nozzle 10 is provided in the upper part in the can body 11 made. Fuel oil is supplied to the spray nozzle 10 from an oil tank (not shown) via a fuel supply unit 15. The fuel supply unit 15 includes an electromagnetic pump, an electromagnetic valve 15a, an oil supply pipe 15b, and the like. On the can body 11, a blower fan 13 is provided for sending combustion air downward into the can body 11, and the combustion air is provided around the spray nozzle 10 and a combustion cylinder 14 provided over a region below the spray nozzle 10. Enter inside. The combustion cylinder 14 has a plurality of vent holes on its peripheral wall, and the combustion air is used as a swirling flow in the combustion cylinder 14 to promote mixing of the sprayed fuel oil and combustion air. Fulfill.

  The bottom casing 3 is arranged below and connected to the can 20 and the silencer 19 so as to support each of them. The can body 20, the bottom casing 3, and the silencer 19 are a series of combustion gas flow paths 8, and the combustion gas generated in the combustor 1 travels downward in the can body 20. After flowing into the bottom casing 3, the direction is changed upward and flows into the silencer 19, and is discharged to the outside as exhaust gas from an exhaust port 19 a provided at the top of the silencer 19. In the configuration in which the combustion gas flow path 8 is bent or curved in a substantially U shape by using the bottom casing 3 in this manner, the silencer 19 is provided on one side of the can 20 of the combustor 1 or the heat exchanger HT. Can be provided in a space-efficient manner in an upright position.

  The heat exchanger HT has a primary heat exchange part 2A and a secondary heat exchange part 2B. The primary heat exchange part 2A is for recovering sensible heat of combustion gas, and is provided in a region near the bottom in the can 20. The primary heat exchanging portion 2A has a structure similar to, for example, a water tube structure of a conventional general heat exchanger, and a tube body 22b having a plurality of fins 24 penetrates the can body 20 in a substantially horizontal direction. It is structured.

  The secondary heat exchange unit 2B is for recovering the latent heat of the combustion gas, and is provided in the bottom casing 3. The secondary heat exchanging section 2B has a configuration in which a plurality of U-shaped tubes 23 including a plurality of plate-like fins 26 are used as pipes for water flow (for heat transfer). The base end portion of each U-shaped tube 23 having a pair of openings 23a and 23b passes through one side wall 30a of the bottom casing 3 and is connected and fixed to a header portion 25 provided outside the one side wall 30a. ing. On the other hand, the distal end portion 23c of each U-shaped tube 23 is a free end in an unsupported state, and each U-shaped tube 23 is a so-called one-sided support. This support structure is suitable for preventing a large stress from being generated during thermal expansion and contraction of each U-shaped tube 23.

  The plurality of U-shaped tubes 23 are arranged such that a pair of openings 23a and 23b are arranged in the vertical direction, and as shown in FIG. 2, an appropriate interval in a direction intersecting the longitudinal direction of the plurality of U-shaped tubes 23. Are lined up. The plurality of U-shaped tubes 23 are arranged in steps so that the heights of the adjacent U-shaped tubes 23 are different. With such an arrangement, the degree of contact of the combustion gas with the plurality of U-shaped tubes 23 increases, and an effect of increasing the efficiency of heat exchange can be expected. However, the present invention is not limited to this, and an arrangement in which the heights of the plurality of U-shaped tubes 23 are the same may be used.

  As clearly shown in FIG. 1, each U-shaped tube 23 extends from one side wall 30 a of the bottom casing 3 to a region directly below the silencer 19 beyond a region directly below the bottom opening of the can body 20. A blocking plate between the upper portion of the fins 26a in the longitudinal direction of each U-shaped tube 23 and the upper wall portion 30c of the bottom casing 3 closes the gap portion and prevents the combustion gas from passing therethrough. 31 is provided. Further, in the portion of the bottom casing 3 near the other side wall 30b, the combustion gas is prevented from advancing from below with respect to the gap 33 between the other side wall 30b and the distal end portion 23c of each U-shaped tube 23. A blocking plate 32 is provided. The presence of these two blocking plates 31 and 32 prevents the combustion gas from flowing around the plurality of U-tubes 23 and the fins 26 in the bottom casing 3, and helps to increase the efficiency of heat exchange. .

  The header portion 25 has a pair of chambers 25 a and 25 b communicating with the openings 23 a and 23 b of the plurality of U-shaped tubes 23. A tubular body having a water inlet 21a is connected to the chamber 25a, and an upstream end 22a ′ of the tubular body 22a is connected to the chamber 25b. In this heat exchanger HT, the water that has entered the water inlet 21a flows into the chamber 25a of the header section 25, and then is heated while passing through the plurality of U-shaped tubes 23 and flows out into the chamber 25b. Next, the water is heated while sequentially flowing through the tubes 22a and 22b, and then flows out from the hot water outlet 21b and is supplied to a predetermined hot water supply destination. If unheated low-temperature water is supplied to each U-shaped tube 23, the efficiency of latent heat recovery of water vapor in the combustion gas is increased. However, the way of water flow to the primary heat exchange part 2A and the secondary heat exchange part 2B is not limited to this.

  Due to the latent heat recovery, water vapor in the combustion gas is condensed and the drain (condensed water) adheres to the plurality of U-shaped tubes 23 and fins 26 constituting the secondary heat exchange unit 2B. Therefore, these parts are preferably made of a material such as stainless steel having excellent corrosion resistance. Further, the metal portion that may come into contact with the drain, such as the bottom plate portion 34 of the bottom casing 3, is preferably made of the same material as described above. However, the entire bottom casing 3 or a part of the bottom plate portion 34 or the like can be made of, for example, synthetic resin, and the manufacturing cost can be reduced. This is because the heat exchanger HT has a latent heat recovery function and can sufficiently reduce the temperature of the combustion gas until the combustion gas proceeds to the bottom of the bottom casing 3. In the primary heat exchanging portion 2A, there is almost no drain, and the tubes 22b and the fins 24 are made of, for example, copper or a copper alloy having excellent heat conduction and workability. Each U-shaped tube 23 is inclined so that the base end portion has a lower height than the distal end portion 23c. According to such a configuration, when draining water in each U-shaped tube 23 for reasons such as disabling the hot water supply device A for a long period of time, the above-described inclination is used to remove the water in each U-shaped tube 23. Water can be caused to flow toward the base end side to smoothly perform the water draining operation.

  The bottom plate part 34 of the bottom casing 3 also has a role of receiving a drain dripping from the secondary heat exchange part 2B. Moreover, it has a role which receives unburned fuel oil so that it may mention later. The bottom plate portion 34 has a discharge port 34a for sending the received drain to the drain neutralizer B1, and the bottom plate 34 is so high that the drain is closer to the discharge port 34a so that the received drain can be efficiently collected in the discharge port 34a. It is inclined so as to be low. Although not shown in the drawing, the bottom plate portion 34 is inclined so that the drain can be collected in the discharge port 34a even in the direction orthogonal to the paper surface of FIG.

  The drain neutralizer B1 includes a synthetic resin container 40, and a granular neutralizer 60 such as calcium carbonate is accommodated in an intermediate portion of the container 40 in the width direction (left-right direction in FIG. 1). It becomes the neutralization treatment tank 4B. As will be described later, a portion close to one end of the container 40 is a separation processing tank 4A for separating and capturing impurities mixed in the drain and a relatively small amount of fuel oil. If ignition failure or the like occurs when the combustor 1 is driven, unburned fuel oil may be generated and mixed into the drain. The separation processing tank 4A has a function of capturing such unburned fuel oil. Have. The portion near the other end of the container 40 is an auxiliary portion 4C for oil detection to which the oil sensor 5 is attached. The container 40 is formed by, for example, a blow molding method, and the separation processing tank 4A, the neutralization processing tank 4B, and the auxiliary portion 4C of the container 40 are integrally formed.

  The separation treatment tank 4A and the neutralization treatment tank 4B are arranged in a space space 91 formed below the bottom plate portion 34 of the bottom casing 3, whereby the drain neutralizer B1 is entirely inside the outer case 90. It is housed in the bottom of the space efficiently. Substantially the entire auxiliary portion 4C is located in the outer case 90, and is a protruding portion 49 that protrudes from the lower region of the bottom casing 3 to one side thereof (left side in FIG. 1). The technical significance of the protrusion 49 will be described later.

  The separation treatment tank 4A is connected to the discharge port 34a via the piping member 34b so as to receive the drain from the discharge port 34a of the bottom casing 3. As clearly shown in FIG. 3, the separation processing tank 4A is substantially box-shaped, and a partition wall 41A extending downward is formed on the upper wall portion thereof, so that the separation processing tank 4A is formed. Is partitioned into first and second chambers 43a and 43b in which the bottoms communicate with each other via a communication part 46A. An oil adsorption filter 61 is provided in the second chamber 43b. The oil adsorbing filter 61 is, for example, fibrous activated carbon, various activated carbons such as Yasuga activated carbon, vegetable fibers such as Kapok fibers, chemical polymers of polymer polymers such as polypropylene, or hydrocarbon granules. Basically, various materials can be used as long as they have excellent oil adsorbability and poor water adsorbability. An opening 43 b ′ with a lid is provided on the upper wall portion of the second chamber 43 b, and this opening 43 b ′ serves as an inlet / outlet for the oil adsorption filter 61.

  In the separation processing tank 4A, when the drain flows into the first chamber 43a from the upper inflow port 45a, the drain is stored at an appropriate liquid level height Ha, fuel oil having a specific gravity smaller than the drain, and the like. These contaminants float on the liquid surface of the drain, and their layer F1 is formed. However, since the partition wall 41A exists in the vicinity of the liquid level, the fuel oil or the like is suppressed from flowing into the second chamber 43b and is captured in the first chamber 43a. Even if the fuel oil passes through the communication portion 46A and flows into the second chamber 43b, the fuel oil is adsorbed and captured by the oil adsorption filter 61. Therefore, it is suppressed that fuel oil flows into the neutralization processing tank 4B through the circulation port 45b. Contaminants having a specific gravity greater than that of the drain become precipitates m. Although this deposit m may flow into the second chamber 43b, since the flow port 45b of the second chamber 43b is at a certain height Ha from the bottom, the precipitate m is neutralized. Inflow into the processing tank 4B is appropriately prevented, and is also prevented by the oil adsorption filter 61.

  A drain level sensor 97 and a discharge port 47a are also provided in the first chamber 43a of the separation processing tank 4A. The liquid level sensor 97 has an abnormally high level in which the liquid level of the drain in the separation processing tank 4A exceeds the height Ha above a certain level due to clogging or the like downstream of the first chamber 43a. When this happens, this is detected, and the detection signal is transmitted to a control unit (not shown) that controls the operation of the hot water supply apparatus A. For example, when the hot water supply device A is not used for a long period of time, the discharge port 47a is provided to prevent the drain in the separation treatment tank 4A from being frozen in the winter by pulling out the drain to the outside. Is closed by a plug 47b such as a screw member.

  The neutralization treatment tank 4B has a substantially box shape provided with openings 43c ′ and 43d ′ with lids for introducing the neutralizing agent 60 therein. However, since the upper wall portion is provided with a partition wall 41B extending downward, the inside of the neutralization treatment tank 4B has first and second bottom portions communicating with each other via the communication portion 46B. Chambers 43c and 43d. This neutralization treatment tank 4B is similar to that described for the separation treatment tank 4A when the fuel oil is not captured in the separation treatment tank 4A and the fuel oil flows into the neutralization treatment tank 4B. According to the principle, fuel oil is trapped in the first chamber 43c. That is, in the first chamber 43c, the fuel oil floats on the drain, and is prevented from flowing into the second chamber 43d due to the presence of the partition wall 41B and is captured. In the neutralization tank 4B, when the drain flows from the first chamber 43c through the communication portion 46B and flows into the second chamber 43d, the drain follows a path that dives under the partition wall 41B. Therefore, it is possible to obtain an effect that the drain passage length in the neutralization treatment tank 4B is made long so that the drain is brought into contact with many neutralizing agents 60 and the neutralization treatment is efficiently performed.

  The auxiliary portion 4C has a flat and substantially box shape, and has a flow path 43e through which a drain flowing from the flow port 45c at the rear of the neutralization treatment tank 4B flows. The drain that has flowed through the flow path 43e is guided to the outside of the exterior case 90 and flows out from the discharge port 45d to an appropriate drainage pipe (not shown) connected to that portion. Two areas of the flow path 43e inside the auxiliary portion 4C and the upper wall 44 are oil detection areas by the oil sensor 5. As described above, the separation treatment tank 4A and the neutralization treatment tank 4B of the drain neutralizer B1 have a function of capturing the fuel oil mixed in the drain. Fuel oil does not flow into 43e. However, for example, when a fuel oil leak occurs and a large amount of fuel oil flows into the drain neutralizer B1, the amount exceeds the oil trappable capacity of the separation treatment tank 4A and the neutralization treatment tank 4B. Fuel oil flows into the flow path 43e. In such a case, the fuel oil is detected by the oil sensor 5.

  On the other hand, as described above, substantially the entire auxiliary portion 4C is a protruding portion 49 that protrudes from the lower region of the bottom casing 3, and this protruding portion 49 is the fuel supply portion 15 of the combustor 1, preferably the fuel. It is located below the main piping part of the supply part 15. With this configuration, when a fuel oil leak occurs in the fuel supply unit 15, the fuel oil flows down along the outer surfaces of the can bodies 11, 20 and other parts, or from the fuel supply unit 15. By directly dripping, it reaches the upper wall portion 44 of the auxiliary portion 4C. On the upper surface of the upper wall portion 44, a concave portion 44b having a standing wall portion 44a is formed on the periphery thereof so that fuel oil that has reached the upper wall portion 44 can be stored. Although not shown in the drawing, the protruding portion 49 has a relatively large width in a direction perpendicular to the paper surface of FIG. 3, and most of the fuel oil that flows down from the fuel supply portion 15 flows into the concave portion 44b. Inflow. Preferably, the protruding portion 49 is formed so as to occupy substantially the entire region immediately below the gap S between the one side wall 90 a of the outer case 90 and the bottom casing 3 at the bottom in the outer case 90. Ensuring that the oil is received is ensured.

  As clearly shown in FIG. 4, the oil sensor 5 includes an oil swelling substance 52 a and a movable member 52 b housed in a casing 51, and a detection switch 52 c is connected to a support member 55 joined to the casing 51. The configuration is attached via 57. The casing 51 has a cylindrical shape having a bottom wall portion at the distal end portion (lower end portion), and a flange 51a is formed at the base end portion (upper end portion). The casing 51 is made of, for example, a porous sintered resin and has hydrophobicity, lipophilicity, and oil permeability. When oil adheres to the outer surface of the casing 51, the oil permeates the casing 51 and can proceed to the inside. The oil swelling material 52 a, the movable member 52 b, and the detection switch 52 c constitute a detection unit 52 that detects when oil enters the casing 51. The oil swelling material 52a is made of, for example, silicon resin powder, and has a characteristic that when the oil enters the casing 51, the oil is absorbed to increase the volume. When the volume of the oil swelling material 52a increases, the movable member 52b rises with this, and presses the switching contact of the detection switch 52c. As a result, a signal indicating that oil has been detected is output and input to the control unit.

  An opening 44c is formed in the upper wall portion 44, and the casing 51 is inserted through the opening 44c. The flange 51a of the casing 51 is in contact with and engaged with the upper surface of the peripheral edge 44d of the opening 44c. With this structure, the opening 44c is closed by the flange 51a, and the height of the casing 51 is set. Of the bottom surface 48 of the auxiliary portion 4C, a portion 48a in the vicinity of the outlet 60b is higher than the other portion by an appropriate dimension Hb, and the drain is placed at an appropriate liquid level height upstream of this portion 48a. Now it can be stored. As a result, the casing 51 is immersed in the drain, and the amount of contact of the drain with the casing 51 can be increased. In addition, a concave portion 48b is formed in the bottom portion 48 directly below the oil sensor 5, and the tip of the casing 51 enters the concave portion 48b. As a result, the amount of the casing 51 immersed in the drain can be further increased, and the amount of fuel oil entering the casing 51 can be increased.

  The support member 55 has a substantially disc shape made of a water-impermeable and oil-impervious synthetic resin, stainless steel, or the like, and covers the base end portion so as to close the opening of the base end portion of the casing 51. The support member 55 is attached to the upper wall portion 44 by a plurality of screw bodies 92. However, a gap 56 is formed between the support member 55 and the upper surface of the upper wall portion 44 as a fuel oil passage. When the fuel oil passes through the gap 56 from above the upper wall portion 44, it reaches the flange 51a of the casing 51, and then proceeds in various directions by capillary action in the minute hollow portion of the sintered resin constituting the casing 51. As a result, it finally enters the casing 51 and is absorbed by the oil swelling material 52a. A step is provided in the peripheral portion 44d of the opening 44c, and a portion of the peripheral portion 44d with which the flange 51a is in contact has a height lower than that of the outer peripheral portion. As a result, the opening width (width in the height direction) of the gap 56 is made smaller than the thickness of the flange 51a, and the fuel oil can easily flow in, but solid dust or the like is difficult to enter. . Further, since the above-described step is provided in the peripheral portion 44d, when the fuel oil advances toward the flange 51a through the gap 56, the fuel oil also advances in this step portion, so that a large amount of fuel oil. Can be transmitted through the flange 51a. The gap 56 is formed over the entire periphery of the support member 55, and when fuel oil is present on the upper wall portion 44, the fuel oil can be appropriately guided to the casing 51 from any direction. It can be done.

  Next, the operation of the hot water supply apparatus A will be described.

  First, in FIG. 1, when the combustor 1 is driven to burn the fuel oil, this combustion gas proceeds downward by the blowing action from the blower fan 13, and the sensible heat is recovered by the primary heat exchange section 2A. And when it advances in the bottom casing 3, the latent heat is recovered by the secondary heat exchange part 2B. According to the configuration in which the secondary heat exchange unit 2B is provided in the bottom casing 3, compared to the configuration in which the secondary heat exchange unit 2B is stacked outside the bottom casing 3, the overall size of the hot water supply device A and parts are reduced. The score can be reduced. In the secondary heat exchanging portion 2B, many drains are generated, and these drains drop on the bottom plate portion 34 of the bottom casing 3 and quickly and from the discharge port 34a to the drain neutralizer B1. It is sent smoothly. For this reason, it is appropriately avoided that the drain adheres over the wide area of the inner wall of the combustion gas flow path 8 and remains. When the combustion of the combustor 1 is stopped or stopped, an unburned fuel oil is mixed into the drain when the ignition failure of the fuel occurs. The spray nozzle 10 injects the fuel oil downward, and the unburned fuel oil is easily collected in the bottom casing 3 and easily mixed into the drain. Therefore, it is also suitable for preventing unburned fuel oil from remaining in the combustion gas flow path 8.

  Next, the drain sent to the drain neutralizer B1 is discharged to the outside via the separation treatment tank 4A, the neutralization treatment tank 4B, and the auxiliary unit 4C. In this case, as described above, an appropriate amount of fuel oil is first captured in the first chamber 43a of the separation processing tank 4A. Further, even if fuel oil that is not captured is generated, it is captured by the oil adsorption filter 61 of the second chamber 43b. Furthermore, it is also captured by the first chamber 43c of the neutralization tank 4B. Contaminants other than the fuel oil are also captured in the separation processing tank 4A. In the neutralization tank 4B, the drain is neutralized. For this reason, in a normal state where a large amount of fuel oil leaks into the combustion gas flow path 8 has not occurred, the drain from which fuel oil and contaminants have been removed and appropriately neutralized is externally provided. This is preferable from the viewpoint of environmental protection.

  In the normal operation state of the hot water supply apparatus A, even if unburned fuel oil is generated due to, for example, poor ignition of the fuel oil, the amount is very small. Therefore, for example, even when the hot water supply device A is used for a long period of 10 years or longer, for example, the oil adsorption filter 61 is not required to be replaced at all, so-called maintenance-free, and is downstream of the neutralization treatment tank 4B. It is possible to prevent the fuel oil from flowing. However, it is assumed that the spray nozzle 10 existing in the can 11 of the combustor 1 and the vicinity thereof are damaged due to an unexpected factor, and a relatively large amount of fuel oil flows into the bottom casing 3 from this portion. Can do. When such an abnormal situation occurs, it becomes difficult to capture the entire amount of fuel oil by the oil adsorption filter 61 and other oil capturing means described above. On the other hand, in the hot water supply device A, if such a situation occurs, the fuel oil flowing through the flow path 43e in the drain neutralizer B1 is detected by the oil sensor 5, and a notification to that effect is given. Therefore, the user can immediately detect the abnormality and take appropriate measures. Based on the detection of the fuel oil, it is possible to perform control such as emergency stop of the combustor 1 and the like. Although the combustor 1 is originally designed so that the fuel oil leakage does not occur as described above, even if the fuel oil leakage occurs due to an unforeseen cause, an appropriate countermeasure as described above is required. This can give a sense of security to the user.

  On the other hand, unlike the above, when fuel oil leakage occurs in the fuel supply unit 15 located outside the can 11 of the combustor 1, for example, the fuel oil protrudes from the container 40 of the drain neutralizer B1. 49 flows down to 49 and is stored in the concave portion 44b of the upper wall 44 thereof. The fuel oil passes through a gap 56 between the upper wall portion 44 and the support member 55 of the oil sensor 5 and enters the casing 51 of the oil sensor 5, which is detected by the detection unit 52 of the oil sensor 5. . Accordingly, even in this case, it is possible to take appropriate measures such as an emergency stop of the hot water supply apparatus A.

  As described above, according to this embodiment, even if fuel oil leaks in the combustor 1 and the fuel oil flows through the combustion gas flow path 8 either inside or outside, this is detected by the oil sensor. Thus, the fuel oil leakage can be reliably detected. Since the oil sensor 5 is attached to the container 40 of the drain neutralizer B1, it is not necessary to separately provide a bracket dedicated to the oil sensor. Further, since the leaked fuel oil is collected in the container 40 of the drain neutralizer B1, it is not necessary to separately provide a dedicated member for collecting the fuel oil. Therefore, it is possible to appropriately detect the fuel oil leakage while suppressing an increase in the total number of parts. Further, the detection of the fuel oil leak is performed at two locations, the inside of the container 40 and the upper wall portion 44, whereas the detection is performed by one oil sensor 5, and therefore, a plurality of fuel oil leaks are detected. Compared to the case of using an oil sensor, it is more preferable to reduce the manufacturing cost.

  5 to 14 show other embodiments of the present invention. In these drawings, the same or similar elements as those of the above embodiment are denoted by the same reference numerals as those of the above embodiment.

  In the drain neutralizer B2 shown in FIG. 5, a part of the neutralization tank 4B is formed as a protruding portion 49A that protrudes to the side from the lower region of the bottom casing 3 inside the outer case 90. The oil sensor 5 is attached to the upper wall portion 44 of the portion 49A. The mounting structure of the oil sensor 5 with respect to the upper wall portion 44 is the same as that of the above embodiment, but the casing 51 of the oil sensor 5 is in direct contact with the drain in the neutralization tank 4B, for example. Thus, it is possible to detect the fuel oil mixed in the drain and floating in the upper layer.

  According to the present embodiment, when the fuel oil flows down from the fuel supply unit 15 of the combustor 1 to the outside of the can bodies 11 and 20, it can be detected by the oil sensor 5 by being received by the protruding portion 49 </ b> A. It is. Since the protruding portion 49A is formed by using a part of the neutralization tank 4B, it is not necessary to provide the container 40 with a portion corresponding to the auxiliary portion 4C of the embodiment shown in FIGS. . Therefore, the shape of the container 40 can be simplified and the cost can be reduced. In addition, it is possible to increase the size of the neutralization treatment tank 4B by an amount that does not require the auxiliary portion 4C and enhance the neutralization treatment function. Furthermore, when the opening 44c for attaching the oil sensor 5 is formed on the upper wall portion 44 of the neutralization treatment tank 4B, the opening 44c can be used as an inlet for the neutralizing agent 60.

As can be understood from the present embodiment and the above-described embodiments, in the present invention, the container that stores the neutralizing agent of the drain neutralizer is only required to be used for mounting the oil sensor. And when the oil sensor is Ru attached to neutralization tank containers, it may be any of the case to be attached to a portion other than neutralization treatment bath container.

  In the embodiment shown in FIG. 5, a standing wall 41 b that stands upward from the bottom of the neutralization treatment tank 4 </ b> B is provided on the downstream side of the partition wall 41 </ b> B in the neutralization treatment tank 4 </ b> B. . According to such a configuration, the drain that has flowed into the upstream region of the second chamber 43d of the neutralization tank 4B flows into the downstream region of the second chamber 43d by crossing the standing wall 41b. Therefore, as compared with the case where such a standing wall 41b is not provided, there is an advantage that the substantial flow path length of the drain in the neutralization treatment tank 4B can be increased and the neutralization treatment can be sufficiently performed. .

  In the configuration shown in FIG. 6, the upper wall portion 44 of the container 40 of the drain neutralizer B <b> 3 has a concave shape inclined in a so-called mortar shape that decreases in height as it approaches the oil sensor 5. According to such a configuration, it becomes possible to positively collect the fuel oil that has flowed into the upper wall portion 44 at the place where the oil sensor 5 is mounted, and it is more preferable to increase the detection accuracy or detection speed of the fuel oil. It becomes.

  In the configuration shown in FIG. 7, a gap 56 as a fuel oil passage is formed between the support member 55 and the upper wall portion 44 by forming a step or a recess in the lower surface portion of the support member 55 of the oil sensor 5. Is provided. Even with such a configuration, it is possible to detect the fuel oil existing in both the inside and the upper region of the container 40 by one oil sensor 5 as in the above-described embodiment.

  In the configuration shown in FIG. 8, the support member 55 of the oil sensor 5 is provided with one or more through holes 56 </ b> A as fuel oil passages. According to such a configuration, when the fuel oil flows on the support member 55, the fuel oil passes through the through hole 56 </ b> A and travels toward the casing 51. As understood from the present embodiment, in the present invention, the fuel oil flowing on the oil sensor 5 may be detected instead of the fuel oil directly present on the upper surface of the upper wall portion 44. Of course, as shown in FIG. 8, the support member 55 is provided with the through hole 55, and as shown in FIGS. 7 and 4, the support member 55 and the upper wall portion 44 are provided with the gap 56. They can be combined.

  In the configuration shown in FIG. 9, a cylindrical wall portion 69 such as a cylindrical shape projecting downward from the lower surface of the upper wall portion 44 of the container 40 is provided, and the wall portion 69 is a casing 51 of the oil sensor 5. Is enclosed. Further, a standing wall 68 having a height higher than that of the lower end of the wall portion 69 is provided in the flow path 43 e downstream of the oil sensor 5. Since the drain wall is blocked by the upright wall 68, the drain is stored at a liquid surface height at which the portion near the lower end of the wall portion 69 is immersed.

  According to the present embodiment, when the fuel oil floats on the drain in the region surrounded by the wall 69 and the fuel oil layer F1 is formed, the layer F1 stays in the region surrounded by the wall 69. Will be. As a result, the fuel oil of this layer F1 has many opportunities to contact the casing 51 of the oil sensor 5. Therefore, the fuel oil can easily enter the casing 51, and the detection accuracy of the fuel oil is increased. In addition, although the standing wall 68 was formed in the bottom part of the flow path 43e as a means for storing a drain with the predetermined | prescribed liquid level height in the flow path 43e, it replaces with this and raises the part 48a shown, for example in FIG. Thus, it is possible to obtain the same operation as that provided by the standing wall 68.

  In the configuration shown in FIG. 10, the wall 69 is not formed in a cylindrical shape, but is substantially U-shaped in plan sectional view in which an opening 69 a is formed on the upstream side in the drain flow direction. According to such a configuration, the fuel oil mixed and flowing into the drain can be actively introduced from the opening 69a into the region surrounded by the wall 69. Of course, the wall 69 prevents the fuel oil flowing into the region from flowing downstream as it is. Therefore, also in the present embodiment, it is possible to easily bring the fuel oil captured by the wall portion 69 into contact with the casing 51 and to improve the detection accuracy of the fuel oil.

  In the configuration shown in FIG. 11A, the entire oil sensor 5 is provided in the auxiliary portion 4 </ b> C of the container 40. For example, the electrical wiring for performing signal output of the detection unit 52 is led out through a hole provided at an appropriate location of the auxiliary unit 4C. On the other hand, an oil guide member 67 for guiding oil existing on the upper wall portion 44 to a position upstream of the oil sensor 5 in the flow path 43e is attached to the upper wall portion 44 of the auxiliary portion 4C. It has been. The oil guide member 67 has, for example, a bar shape or a plate shape, and is made of a sintered resin having hydrophobicity, lipophilicity and oil permeability, like the casing 51 of the oil sensor 5. The oil guide member 67 passes through the upper wall portion 44, and its upper end is exposed above the upper wall portion 44.

  In the present embodiment, since the oil sensor 5 is provided in the flow path 43e, the fuel oil present in the flow path 43e can be detected, and the fuel oil present on the upper wall portion 44 is detected. Can be guided through the oil guide member 67 into the flow path 43e. The fuel oil introduced into the flow path 43e in this way comes into contact with the casing 51 of the oil sensor 5 in the process of flowing downstream, and this is detected. Thus, in the present invention, the entire oil sensor 5 can be provided in the container 40 and the oil on the upper wall 44 can be introduced into the container 40 by the guide means. Thus, if the whole oil sensor 5 is arrange | positioned in the container 40, it will become possible to protect the oil sensor 5 from an external environment.

  In the configuration shown in FIG. 11B, the lower end portion 67 a of the oil guide member 67 is in contact with the outer surface of the casing 51 of the oil sensor 5. According to such a configuration, the fuel oil descending through the oil guide member 67 can be directly advanced to the casing 51, and the detection of the fuel oil becomes more reliable.

  In the configuration shown in FIG. 11C, the oil guide member 67A is a pipe having a through hole, and the fuel oil existing in the upper wall portion 44 flows through the through hole of the oil guide member 67A. It is led into the path 43e. Even with such a configuration, when the fuel oil is present on the upper wall portion 44, it can be detected by the oil sensor 5. In the configuration of the present embodiment, when there is a liquid or other substance other than the fuel oil on the upper wall portion 44, these may be guided into the flow path 43e. It is preferred to use this configuration under conditions. As understood from the present embodiment, the oil guide means in the present invention is preferably configured using a member having hydrophobicity, lipophilicity and oil permeability, but it is not always necessary to use such a member. Good. In the present invention, instead of the configuration in which the oil guide members 67 and 67A are provided in the upper wall portion 44, a through hole is provided in the upper wall portion 44, and the fuel oil on the upper wall portion 44 passes through the through hole. It is also possible to adopt a configuration in which the liquid is simply dropped into the flow path 43e.

  In the configuration shown in FIG. 12, the entire oil sensor 5 is mounted on the upper wall portion 44 of the container 40, and the fuel oil on the upper wall portion 44 can be directly detected. The upper wall portion 44 is formed in an inclined concave shape so that fuel oil can be collected around the casing 51. On the other hand, an oil guide member 67B extending through the upper wall 44 and into the flow path 43e is connected to the bottom of the casing 51. The oil guide member 67B is made of the same material as the casing 51, for example, and has hydrophobicity, lipophilicity and oil permeability. Preferably, the lower end tip portion of the oil guide member 67B is provided so as to enter the recess 48b provided in the bottom surface portion 48 of the flow path 43e and be immersed in the drain stored in the recess 48b.

  According to the present embodiment, when the fuel oil existing in the flow path 43e comes into contact with the oil guide member 67B, the fuel oil advances toward the oil guide member 67B upward by capillary action and reaches the casing 51. . Therefore, although the oil sensor 5 is provided on the upper wall portion 44, it is possible to detect the fuel oil in the flow path 43e. If the oil sensor 5 is attached to the upper wall portion 44 as in this embodiment, the attaching operation and the wiring of the electrical wiring are facilitated.

  In the configuration shown in FIG. 13, the casing 51 of the oil sensor 5 is inserted into the opening 44 c provided in the upper wall portion 44, so that the casing 51 is disposed in the flow path 43 e and above the upper wall portion 44. It straddles two oil detection areas.

  In the present embodiment, the fuel oil in the flow path 43e travels from the lower end tip of the casing 51 into the casing 51, and the fuel oil on the upper wall portion 44 enters the casing 51 from the intermediate portion in the height direction of the casing 51. In any case, it is possible to detect the fuel oil. According to this embodiment, unlike the above-described embodiment, it is not necessary to use an oil guide member separately. Therefore, the total number of parts can be reduced, and the manufacturing cost can be further reduced.

  In the above-described embodiment, the fuel oil existing on the upper wall portion 44 of the container 40 and in the flow path 43e can be detected by one oil sensor 5, but the present invention is not limited to this. In the present invention, for example, as shown in FIG. 14, two oil sensors 5A and 5B are attached to the upper wall 44 of the container 40 of the drain neutralizer B4 and to the flow path 43e in the container 40, thereby fueling them. Oil detection may be performed individually. According to such a configuration, although the total number of oil sensors is increased, the intended purpose of the present invention can be achieved.

The present invention is not limited to the embodiment described above. Specific configuration of a hot water supply equipment of each portion according to the present invention may be modified in various ways.

  In the present invention, it is optimal that the oil sensor attached to the container of the drain neutralizer can detect each of the fuel oil traveling on the container and the fuel oil traveling on the container. However, it is not limited to this. The oil sensor attached to the container may be configured to detect only the fuel oil traveling on the container or to detect only the fuel oil traveling on the container. In addition, the drain neutralizer container may be configured not to be provided so that the fuel oil travels in both the upper part and the interior thereof. The fuel oil may be advanced only in the upper part of the container or only in the inside. The present invention is characterized in that the drain neutralizer container is effectively used as a fuel oil collecting container and an oil sensor mounting bracket. For example, the fuel that has progressed to the top of the container Even in the case of a configuration that only detects oil or only the detection of fuel oil that has progressed inside the container, the configuration is reasonable compared to the prior art, and the overall structure is simplified. This is because it is possible to accurately detect fuel oil leakage while reducing the manufacturing cost.

  Various oil sensors other than those described above can be employed as the oil sensor. For example, a change in volume when the oil swelling substance absorbs fuel oil and swells can be detected by an optical detection means, and the fuel oil can be detected by this. The drain neutralizer may be configured so as not to have a portion corresponding to the separation processing tank. In short, it may be configured to have a configuration in which a neutralizing agent is accommodated in the container. The specific shape, size, material and manufacturing method of the container are not limited at all.

  The present invention is suitable when the hot water supply apparatus is configured as a so-called reverse combustion method, but is also applicable to other types of hot water supply apparatuses. The combustor may have a structure in which, for example, the fuel is vaporized and burned instead of the fuel oil sprayed and burned. The heat exchanger may not have a structure in which the secondary heat exchange unit is provided in the bottom casing. In addition, the hot water supply apparatus according to the present invention can be configured as a so-called instantaneous water heater, and can also be configured as an apparatus for supplying hot water to various uses such as floor heating and snow melting. it can. The fuel oil in the present invention is a broad concept including petroleum such as kerosene and light oil, oil as a fractional component of petroleum, and combustion oil generated from other than petroleum.

It is principal part sectional drawing which shows an example of the hot water supply apparatus which concerns on this invention. It is II-II principal part sectional drawing of FIG. It is principal part sectional drawing which shows the drain neutralizer which the hot water supply apparatus shown in FIG. 1 comprises. It is principal part sectional drawing of FIG. It is principal part sectional drawing which shows the other example of a drain neutralizer. It is principal part sectional drawing which shows the other example of a drain neutralizer. It is principal part sectional drawing which shows the other example of the attachment structure of the oil sensor to a drain neutralizer. It is principal part sectional drawing which shows the other example of the attachment structure of the oil sensor to a drain neutralizer. (A) is principal part sectional drawing which shows the other example of the attachment structure of an oil sensor, (b) is IX-IX sectional drawing of (a). It is principal part plane sectional drawing which shows the other example of the attachment structure of an oil sensor. (A)-(c) is principal part sectional drawing which shows the other example of the attachment structure of an oil sensor. It is principal part sectional drawing which shows the other example of the attachment structure of an oil sensor. It is principal part sectional drawing which shows the other example of the attachment structure of an oil sensor. It is principal part sectional drawing which shows the other example of the attachment structure of the oil sensor to a drain neutralizer.

Explanation of symbols

A Water heater B1-B4 Drain neutralizer HT Heat exchanger 1 Combustor 2A Primary heat exchanger (heat exchanger)
2B Secondary heat exchange section (heat exchanger)
3 Bottom casing 5 Oil sensor 8 Combustion gas flow path 19 Silencer (exhaust duct)
20 Can body 34 Bottom plate part 34a Discharge port 40 Container (of drain neutralizer)
44 Upper wall (container)
51 Casing (for oil sensor)
52 Detection Unit 52a Oil Swelling Substance 52b Movable Member 52c Detection Switch 55 Support Member 56 Clearance (Oil Guide Means)
56A Through hole (oil guide means)
60 Neutralizing agent 61 Oil adsorption filter

Claims (10)

A combustor attached to the top of the can body and burning fuel oil;
Combustion gas flow that is formed using the can body and a bottom casing connected to the lower portion of the can body so as to be positioned below the can body and that guides the combustion gas generated by the combustor to an exhaust port Road,
A heat exchanger having a water passage tube for performing heat exchange with the combustion gas;
A container disposed below the combustor, the can body, and the bottom casing , and a container that is generated by the heat exchange and flows down into the bottom casing and received by the bottom plate portion, and the container. A drain neutralizer having a neutralizing agent housed in a container;
A hot water supply device comprising:
A phenomenon in which when the fuel oil leaks in the combustor, the fuel oil flows down inside the can body and is received by the bottom plate portion of the bottom casing and then proceeds into the container of the drain neutralizer; And the fuel oil flows down along the outer surface of the can body and the casing and protrudes from the bottom of the bottom casing to the side of the upper wall of the drain neutralizer container. It is configured to be able to cause at least one of the phenomena that proceed to the part ,
A hot water supply apparatus, wherein the container is provided with at least one oil sensor capable of detecting fuel oil that has advanced on at least one of the upper wall portion and the inside of the container. Said drain neutralizer, when the fuel oil ran down along the outer surface of the can body and the bottom casing leaks from the combustor, of the upper wall portion of the container, the side from below of the bottom casing The fuel oil can be received by the protruding portion provided so as to protrude toward the side, and when the fuel oil leaks from the combustor and flows down inside the can body , the fuel oil is removed from the bottom plate portion of the bottom casing. It is configured to be able to flow into the container after being received by
The hot water supply device according to claim 1, wherein any fuel oil on and inside the upper wall of the container can be detected by the oil sensor. The bottom portion so as to stand on the casing provided with the connected exhaust duct to the bottom casing,
The combustion gas flow path is formed in a continuous manner inside the can body, the bottom casing, and the exhaust duct, and combustion gas that has progressed downward from the fuel combustion region of the combustor into the can body. It is configured to enter the exhaust duct upward by being U-turned in the bottom casing,
The heat exchanger has a configuration in which the water pipe is disposed in at least one of the can and the bottom casing,
The bottom plate portion of the bottom casing is capable of receiving these when a drain falls from a tube of the heat exchanger and when fuel oil flows from the combustor into the combustion gas flow path,
A portion of the container of the drain neutralizer is disposed below the bottom plate portion so that the drain received by the bottom plate portion and unburned fuel oil are introduced into the inside, and another portion of the container, said bottom being formed as the protruding portion that protrudes to the side from the bottom of the casing, the fuel oil which has flowed down the outer region of the can body and bottom casing leaks from the combustor, the The hot water supply device according to claim 2, wherein the hot water supply device is configured to be received by the protruding portion.   The whole or part of the upper surface portion of the protruding portion has a concave shape capable of storing the fuel oil that has traveled to the protruding portion, and the fuel oil that has reached the concave portion is detected by the oil sensor. The hot water supply apparatus according to claim 3.   5. The oil sensor according to claim 2, wherein a fuel oil in any region between the inside of the container and the upper wall portion can be detected by only one oil sensor. The hot-water supply apparatus in any one. The oil sensor includes a casing for oil permeation and an oil detection unit that detects when fuel oil enters the casing,
At least a part of the casing of the oil sensor is disposed in the container of the drain neutralizer so that the fuel oil existing in the container can enter the casing,
The hot water supply apparatus according to claim 5, wherein the oil sensor or the container is provided with an oil guide means for guiding the fuel oil that has traveled on the upper wall portion of the container into the casing of the oil sensor or the casing. . The upper wall portion of the container is provided with an opening through which the casing is inserted so that at least the tip of the casing of the oil sensor is disposed in the flow path.
The oil sensor includes a support member that is attached to the periphery of the opening of the upper wall and covers the upper surface of the base end of the casing.
A region between the support member and the upper wall portion, or the support member has a gap shape for guiding fuel oil existing on the upper wall portion or on the support member toward the casing or the casing. Or the hot water supply apparatus of Claim 6 by which the hole-shaped channel | path is provided and this channel | path is the said oil guide means. The casing of the oil sensor and the whole of the detection unit are provided in a container of the drain neutralizer,
The hot water supply apparatus according to claim 6, wherein the oil guide means is provided so as to guide fuel oil existing on an upper wall portion of the container into the container. The casing of the oil sensor and the detection unit are provided on an upper wall of the container;
The oil guide means extends from the casing into the flow path, and is configured to be able to raise oil existing in the flow path toward the casing or the casing. Water heater. The drain neutralizer is provided with an oil catching means capable of catching fuel oil at a portion upstream of the oil sensor in the flow direction of the drain, and the fuel oil is not caught by the oil catching means and is downstream thereof. this when a situation which proceeds occurs is configured to be detected by the oil sensor, hot water supply equipment according to any one of claims 2 to 9.

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