JP4513628B2 - Sub-tank device for fuel oil and combustion device provided with the same - Google Patents

Description

  The present invention relates to a sub-tank device for fuel oil that is used for applications such as supplying fuel oil such as kerosene or light oil to an oil combustor of a hot water supply device, and a combustion device including the same.

  In a hot water supply apparatus equipped with an oil combustor, a fuel oil storage tank (main tank) is installed separately from the hot water supply apparatus, and fuel oil is supplied from the tank to the hot water supply apparatus using a pump. It is common. However, when the fuel oil pumped up from the tank by the pump is directly supplied to the oil combustor, the pump cannot be disposed close to the oil combustor, and the distance between them may become long. . Thus, when the distance between the pump and the oil combustor becomes long, the actual fuel supply to the oil combustor is not likely to correspond accurately to the driving of the pump. Therefore, the above-described configuration is not so preferable when it is desired to precisely control the combustion thermal power of the oil combustor by controlling the supply amount of fuel oil or when it is desired to stabilize the combustion thermal power.

  Therefore, as means for solving the above-mentioned problem, there is means for providing a sub tank in the middle of the fuel supply path from the main tank to the oil combustor. In this means, fuel oil is supplied from the main tank to the sub tank using the first pump. Meanwhile, fuel oil is supplied from the sub tank to the oil combustor using a second pump. In this way, the second pump can be disposed close to the oil combustor, and the above problem is solved.

  However, in the past, although the best care was taken to prevent fuel oil leaks, it is still possible that fuel oil leaks in the sub-tank due to a failure of the fuel supply equipment. . On the other hand, in the past, when such oil leakage in the sub-tank occurred, no actual measures have been taken to deal with this quickly and accurately. For example, Patent Documents 1 and 2 propose a technique for detecting fuel oil leakage using an oil sensor in a boiler or the like equipped with a combustor. Therefore, it cannot be suitably used as an oil leakage countermeasure for the sub tank. In addition, as a conventional hot water supply apparatus, there is an apparatus in which an oil sensor is installed in the vicinity of the bottom portion thereof, and this is detected when fuel oil flows to a place where the oil sensor is installed. However, in such a configuration, when fuel oil leaks in the sub tank, oil detection is not performed during a period from when the leaked fuel oil flows down to the vicinity of the bottom of the hot water supply apparatus until it reaches the oil sensor. In this case, it takes a long time from the time of occurrence of fuel oil leakage until the detection thereof, and this causes a problem that a wide area of the hot water supply device is contaminated by the fuel oil. When the hot water supply device is a so-called reverse combustion type and the oil combustor is installed at a relatively high height, it is preferable to install the sub tank at a high position corresponding to this, but in this case, the sub tank As a result, the larger area is contaminated by the fuel oil leaking downward, and the above-described problems become more prominent.

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

  The present invention has been conceived under such circumstances, and in the unlikely event that an oil leak occurs, the sub-tank for fuel oil capable of promptly and appropriately detecting that fact An object of the present invention is to provide an apparatus and a combustion apparatus including the apparatus.

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

  The fuel oil sub-tank device provided by the first aspect of the present invention closes the upper opening-shaped oil tank and the upper opening of the oil tank, and allows the fuel oil to flow into and out of the oil tank. A fuel oil sub-tank device that is provided and used in the middle of a fuel supply path from a fuel oil storage main tank to an oil combustor. When the fuel oil that is provided along the upper outer periphery of the oil tank so as to surround the outer periphery of the lid and leaks onto the upper surface of the lid flows toward the upper outer periphery A standing wall capable of blocking the fuel oil on the lid or the oil tank, and the fuel oil blocked by the standing wall outside the upper portion An outlet provided in the upper outer peripheral edge or the standing wall so as to flow out to the outer region of the edge, and an oil sensor provided so as to detect fuel oil flowing out from the outlet. It is characterized by.

  According to such a configuration, the following effects can be obtained.

  That is, if a fuel oil leak occurs due to a failure of a related device and the fuel oil leaks on the upper surface of the lid body, the fuel oil flows toward the outer edge of the lid body. Is surrounded by a standing wall of the oil tank, and the fuel oil is blocked by the standing wall. Therefore, the fuel oil does not flow down from the outer periphery of the lid body or the oil tank as it is, and the wide area under the oil tank is appropriately prevented from being contaminated by the fuel oil. On the other hand, the fuel oil blocked by the standing wall flows out from the upper outer peripheral edge of the oil tank or the outflow port provided in the standing wall to the outer region of the upper outer peripheral edge of the oil tank. Detects spilled fuel oil. Therefore, the fuel oil that has been blocked on the lid or the oil tank is collected at the outlet and then guided to the oil sensor, so that the fuel oil can be detected quickly and accurately by the oil sensor. Is possible. As a result, there is an advantage that it is possible to quickly and accurately take countermeasures such as stopping the operation of the oil combustor based on the detection of the fuel oil or stopping the supply of the fuel oil to the oil tank.

  In addition, the oil inflow / outflow means for causing the fuel oil to flow into and out of the oil tank is provided on the lid. However, if fuel oil leaks in the oil inflow / outflow means, the oil leaks onto the lid. This fuel oil is then accurately guided to the oil sensor and detected. Therefore, it is possible to obtain the fuel oil leak detection that matches the actual situation.

  In a preferred embodiment of the present invention, an oil receiving member for receiving the fuel oil flowing out from the outlet is provided, and the oil sensor detects the fuel oil received by the oil receiving member. Is provided.

  According to such a configuration, it is possible to increase the amount of time that the fuel oil contacts with the oil sensor and to increase the amount of the fuel oil, thereby improving the reliability of fuel oil detection.

  In a preferred embodiment of the present invention, a case-shaped or frame-shaped protective member that covers the periphery of the oil tank is provided.

  According to such a configuration, when the oil tank is provided close to the oil combustor, radiant heat traveling from the oil combustor is blocked by the protective member, and the oil tank is heated to a high temperature. Can be prevented. Therefore, the oil tank is suitable for installation close to the oil combustor. Of course, the protective member is useful not only for thermal protection of the oil tank but also for other mechanical protection.

  In a preferred embodiment of the present invention, the oil receiving member is provided so that fuel oil received by the oil receiving member flows into the protective member, and the protective member is the oil receiving member. The bottom part which receives the fuel oil which flowed in from the inside and the discharge port which discharges the fuel oil received by this bottom part to the exterior of this protection member are provided.

  According to such a configuration, the protection member is effectively used as a guide member for the leaked fuel oil, which is reasonable. Further, if the fuel oil is discharged from the discharge port of the protective member, the fuel oil can be guided to, for example, a container for collecting the fuel oil, so that the leaked fuel oil can be easily treated.

  In a preferred embodiment of the present invention, the lid includes a plate-like portion that closes the upper opening of the oil tank, and an additional upright wall formed by bending the outer peripheral edge of the plate-like portion upward, A slit that allows fuel oil leaked to the upper surface of the plate-like portion and blocked by the additional upright wall to advance toward the upright wall of the upper outer periphery of the oil tank;

  According to such a configuration, the additional rising wall of the lid body blocks the fuel oil that has traveled to the outer peripheral edge of the plate-like portion of the lid body, so that the fuel oil is directly on the upper outer peripheral edge of the oil tank. In order to prevent the fuel from advancing, it is possible to more reliably prevent the fuel oil from flowing down from the lid and the oil tank. The fuel oil blocked by the additional upright wall passes through the slit and travels toward the upper outer peripheral edge of the oil tank, and then is detected by an oil sensor, and the additional upright wall is provided. There is no inconvenience that the detection of the oil sensor becomes difficult due to being performed. Moreover, if the additional standing wall bent and formed in the outer periphery of the plate-shaped part of a cover body is provided, the effect which the rigidity of a cover body will be improved is also acquired. Further, it is possible to make the additional upright wall function as, for example, a bracket for mounting the oil sensor.

  A combustion apparatus provided by the second aspect of the present invention includes an oil combustor, a fuel oil sub-tank apparatus provided in the middle of a fuel supply path from a main tank for storing fuel oil to the oil combustor, The fuel oil sub-tank device provided by the first aspect of the present invention is used as the fuel oil sub-tank device.

  According to such a configuration, an effect similar to that described for the fuel oil sub-tank device provided by the first aspect of the present invention can be obtained.

  In a preferred embodiment of the present invention, there is provided control means for stopping the combustion drive of the oil combustor when the oil detection is performed by the oil sensor and notifying the fact by the notification means.

  According to such a configuration, even though fuel oil leakage has occurred, the combustion drive of the oil combustor is not continued unjustly thereafter. Further, the user can accurately detect the occurrence of fuel oil leakage based on the notification operation of the notification means.

  In a preferred embodiment of the present invention, there is provided a shutoff valve for shutting off the supply of fuel oil from the main tank to the fuel oil subtank device when oil detection is performed by the oil sensor.

  According to such a configuration, the fuel oil leakage can be stopped at an early stage, which is suitable for reducing damage caused by the oil leakage.

  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 specifically described with reference to the drawings.

  FIG. 1 shows an example of a hot water supply apparatus to which the present invention is applied. The hot water supply apparatus A of the present embodiment is an oil reverse combustion type, and includes a hot water supply apparatus main body 1, a control unit 19, an exterior case 17, a fuel oil sub tank device B (hereinafter simply referred to as “sub tank device B”), and a pump. P1 is provided.

  A main tank 20 for storing fuel oil such as kerosene is installed outside the outer case 17. The pump P1 is connected to the main tank 20 and the sub tank device B via pipes 21a and 21b, and is used to supply fuel oil in the main tank 20 to the sub tank device B. One of the pipes 21a and 21b is provided with a shut-off valve 22 for forcibly stopping the supply of fuel oil from the main tank 20 to the sub tank device B. The sub-tank apparatus B includes a pump P2 connected to the oil combustor 12 of the hot water supply apparatus main body 1 via a pipe 21c, and fuel oil is supplied to the oil combustor 12 by driving the pump P2. It has become so. The sub tank device B is attached to a position near the upper portion of the one side wall 17a of the outer case 17 so as to be disposed close to the oil combustor 12. The detailed structure of the sub tank device B will be described later.

  The hot water heater main body 1 has the same configuration as a conventionally known reverse combustion hot water heater, and uses an air blower fan 10 to supply combustion air downward into the can body 11 from above. 12, the fuel oil is burned downward. The combustion gas that has traveled below the oil combustor 12 passes through the primary and secondary heat exchangers 13A and 13B, respectively, and sensible heat and latent heat are recovered from the combustion gas by the water tubes 130A and 130B. It has become. The combustion gas that has finished the heat recovery passes through the inside of the exhaust duct 14 and reaches the exhaust port 14a, and is discharged from this portion to the outside of the exterior case 17 as exhaust gas. A part of the exhaust duct 14 is configured as a silencer in which a sound-absorbing material (not shown) is provided so that exhaust noise is reduced. The water pipes 130A and 130B are connected to the water inlet 131 and the hot water outlet 132, and the water supplied to the water inlet 131 passes through the secondary heat exchanger 13B and the primary heat exchanger 13A in sequence, thereby causing hot water. This hot water is supplied from the hot water outlet 132 to a desired hot water supply destination.

  The control unit 19 is connected to an operation remote controller 18 installed in a room or the like, and each unit of the hot water supply apparatus A is configured so that hot water at a target hot water temperature set by the remote controller 18 is discharged from the hot water outlet 132. Control and various signal processing controls. Further, the control unit 19 is configured to perform a predetermined operation control when a fuel oil leak occurs in the sub tank device B, as will be described later.

  Next, the configuration of the sub tank apparatus B will be described in detail with reference to FIGS.

  2 to 4, the sub tank device B includes an oil tank 3, a lid body 4, a protective case 5, and an oil sensor 6. The oil tank 3, the lid body 4, and the protective case 5 are all formed by pressing a metal plate. For example, the oil tank 3 is made of copper, and the lid 4 and the protective case 5 are made of stainless steel. The protective case 5 has a configuration in which a frame-like member 51 formed separately from a plate-like base member 50 is assembled.

  The oil tank 3 has a bottom portion and a side wall portion standing up from the bottom portion, and has a substantially bathtub shape with an open top portion. A flange portion 30 protruding in a substantially horizontal direction is formed at the upper portion of the side wall portion, and an upright standing wall 31 is continuously provided at the peripheral edge of the flange portion 30. As clearly shown in FIG. 3, the flange portion 30 is continuously formed over the entire outer periphery of the upper portion of the oil tank 3. The standing wall 31 is also basically formed over the entire circumference of the outer periphery of the flange portion 30, but a part of the standing wall 31 is notched, and an outflow port 32 for leaking fuel oil is provided. The outflow port 32 is a part for allowing the leaked fuel oil flowing from the lid 4 to flow out from the oil tank 3 and leading it to an oil detection receiving member 7 described later.

  The lid 4 serves to close the upper opening of the oil tank 3 and to support equipment and parts for the flow of fuel oil into and out of the oil tank 3. The lid 4 has a substantially rectangular flat plate-like portion 40 and an upright wall 41 formed by bending the outer peripheral edge of the plate-like portion 40 upward. This standing wall 41 corresponds to an example of an additional standing wall referred to in the present invention. The plate-like portion 40 is placed on and supported on the flange portion 30 of the oil tank 3, and is attached to the flange portion 30 using a plurality of screw bodies 90.

  In addition to the pump P2 described above, a liquid level leveler S1 is attached to the plate-like portion 40 of the lid body 4, and a fuel for inserting and attaching one end of a pipe 21b for supplying fuel oil. An oil inlet 42 is also provided. The pump P2 has its main body portion 91a mounted on the plate-like portion 40 and screwed thereto, but the intake of the pump P2 so that the fuel oil in the oil tank 3 can be sucked and sent to the oil combustor 12. The pipe 91 b passes through the plate-like portion 40 and is arranged in the oil tank 3. The liquid level sensor S1 is for detecting the level of the fuel oil in the oil tank 3, and includes a float 92b that floats up to the level of the fuel oil in the oil tank 3, and the float 92b When the predetermined upper limit and lower limit heights are reached, the corresponding signal output is performed. The liquid level sensor S1 also penetrates the plate-like portion 40, and its upper portion 92a is placed on the plate-like portion 40 and screwed. The signal detected by the liquid level sensor S1 is used for driving control of the pump P1, and the pump P1 is driven when the fuel oil reaches the lower limit height, and the driving is stopped when the fuel oil reaches the upper limit height. ing.

  The standing wall 41 of the lid 4 is formed along substantially the entire circumference of the outer peripheral edge of the plate-like portion 40. However, slits 42 extending in the vertical direction are formed in each of the four corners of the plate-like portion 40. Due to the presence of these slits 42, the upright wall 41 is separated into four regions. Each slip 42 plays a role of causing fuel oil leaked onto the plate-like portion 40 of the lid 4 to flow out to the outer peripheral region of the plate-like portion 40. The standing wall 31 of the oil tank 3 stands up so as to surround the outer periphery of the standing wall 41 of the lid 4. A groove-like gap 43 is formed between the two upright walls 31 and 41. Therefore, when the fuel oil on the plate-like portion 40 of the lid 4 passes through the slit 42, it enters the gap 43, but is blocked so that it does not fall out of the oil tank 3 due to the presence of the standing wall 31. It is done. However, as described above, the standing wall 31 has the outflow port 32, and the fuel oil flows from the outflow port 32 toward the receiving member 7.

  The protective case 5 serves to protect and support the oil tank 3 and guide the leaked fuel oil. The base member 50 of the protective case 5 is a portion that is fixedly attached to the side wall of the exterior case 17 shown in FIG. 1 and is attached to the exterior case 17 at both side edges extending in the vertical direction. Bracket portions 52A and 52B having a plurality of bolt insertion holes 52a are formed. The frame-like member 51 of the protective case 5 is a part that is attached to the base member 50 and surrounds the oil tank 3. As clearly shown in FIG. 3, an opening 54 is formed in the upper surface portion 53 of the frame-shaped member 51 so that the oil tank 3 can be accommodated from above. The flange portion 30 of the oil tank 3 can be supported by the peripheral portion. A screw hole 53 a into which the screw body 90 described above is screwed is formed in the upper surface portion 53 of the frame-like member 51. The upper surface portion 53, the flange portion 30 of the oil tank 3, and the outer peripheral edge portion of the plate-like portion 40 of the lid body 4 are overlapped in the vertical direction and connected by a screw body 90.

  The frame-like member 51 has three side wall portions 55a to 55c that surround the side wall portion of the oil tank 3, and a bottom portion 55d. Since the sub tank device B is provided close to the oil combustor 12 as described above, the sub tank device B receives radiant heat from the oil combustor 12, but the side wall portions 55 a to 55 c block the radiant heat and the oil tank 3. Plays a role in preventing temperature rise. Further, if the temperature rise is prevented in this way, the sub tank device B can be brought closer to the oil combustor 12 by that amount. Note that, of the side wall portions 55a to 55c, for example, when the side wall portion 55a faces the oil combustor 12, the side wall portion 55a plays a large role of heat insulation, and the other side wall portions 55b and 55c perform heat insulation. The role of is small. Accordingly, the side wall portions 55b and 55c can be appropriately provided with openings or the like for providing air permeability in the protective case 5. If the protective case 5 is provided with air permeability, the temperature rise of the oil tank 3 can be prevented more appropriately.

  The assembly structure of the frame-shaped member 51 with respect to the base member 50 will be briefly described. As clearly shown in FIG. 5, the base member 50 is formed with a pair of upper and lower locking pieces 56 a and 56 b formed by so-called cutting and raising processing. A protruding piece 57a protruding downward from the bottom 55d of the frame-like member 51 is locked to the locking piece 56b. Further, the standing wall 41 of the lid 4 is locked to the locking piece 56a. As described above, the three members of the frame-shaped member 51, the oil tank 3, and the lid body 4 are connected and fixed to each other using the plurality of screw bodies 90. The three members can be supported by the base member 50 by locking each part thereof to the pair of locking pieces 56a and 56b. Such locking can be performed by sliding the standing wall 41 and the protruding piece 57a in a direction perpendicular to the paper surface of FIG. 5 with respect to the pair of locking pieces 56a and 56b. If such a slide system is adopted, when the sub tank apparatus B is attached to the exterior case 17, the base member 50 is first fixed to the exterior case 17 alone, and then the three members are assembled to the base member 50. What is necessary is that the operation becomes easy. Further, even during maintenance, the three members can be removed while the base member 50 is fixed to the exterior case 17, and the operation is also facilitated. In addition, since it cannot fix in the said sliding direction only by the support using a pair of locking pieces 56a and 56b, as a means for assisting this, for example, the base member 50 protrudes to the lid 4 side. A bracket 57 is provided, and the bracket 57 is screwed to the standing wall 41 of the lid body 4 using a screw body 90a.

  As clearly shown in FIG. 6, the oil sensor 6 is attached to the receiving member 7 using a sensor holder 69. As the oil sensor 6, a conventionally known one can be used. For example, when oil flows into the oil-permeable casing 60, an oil swelling substance such as a silicone resin powder accommodated in the casing 60 is used. Thus, the movable member 61 in the casing 60 rises. The rising of the movable member 61 is detected by the detection main body 62. The sensor holder 69 and the receiving member 7 are formed by, for example, pressing a stainless steel plate, and the sensor holder 69 has a cylindrical shape with both upper and lower ends opened. An upper base portion 63 of the oil sensor 6 is placed on a pair of support pieces 69a formed on the upper portion of the sensor holder 69, and this portion is screwed so that the oil sensor 6 is attached to the sensor holder 69. Assembly is planned.

  The receiving member 7 has a pair of side wall portions 71 a and 71 b erected from the bottom portion 70. The sensor holder 69 has a pair of locking pieces 69b provided at the top thereof and locked at the upper ends of the pair of side wall portions 71a and 71b, and a pair of substantially horizontal protruding pieces 69c provided at the bottom. Is set so as to engage with the cut portion 72 at the lower part of the pair of side wall portions 71a, 71b. Due to this locking structure, the sensor holder 69 is positioned and held by the receiving member 7. According to such a configuration, the sensor holder 69 can be attached to the receiving member 7 without performing bolting or the like, and the assembling work is easy. A notch 73 having a lower end opening that engages with the standing wall 41 of the lid 4 is provided at the tip of the side wall 71a, and a screw body 90b is used for the tip of the side wall 71b. A bracket piece 74 is provided for fixed connection with the four standing walls 41. With this structure, the receiving member 7 is fixedly attached to the standing wall 41 of the lid body 4 so as to be positioned on one side of the lid body 4 and the protective case 5.

  As shown well in FIG. 4, a part of the bottom portion 70 of the receiving member 7 enters the notch 58 provided in the protective case 5, and the flow provided on the standing wall 31 of the oil tank 3. Located below the outlet 32. With this structure, the fuel oil discharged from the outlet 32 is received by the bottom portion 70 of the receiving member 7. The bottom portion 70 has a saucer-like shape in which the periphery stands up, and the fuel oil does not flow down from the outer peripheral portions as it is. However, the bottom portion 70 is formed with a notch 75 for allowing the fuel oil flowing into the bottom portion 70 to flow down into the protective case 5. The bottom 55d of the protective case 5 is formed so as to be able to receive the fuel oil that has flowed down from the notch 75. The base member 50 of the protective case 5 is provided with a discharge port 59 for discharging the fuel oil received by the bottom 55d to the outside of the protective case 5. As shown in FIG. 1, a pipe 29 for guiding fuel oil discharged from the discharge port 59 to the recovery container 99 is connected to the discharge port 59.

  Next, the operation of the above-described sub tank device B and the hot water supply device A provided with the sub tank device B will be described.

  First, in FIG. 1, during normal operation of the hot water supply apparatus A, the fuel oil in the oil tank 3 is supplied to the oil combustor 12 by driving the pump P <b> 2 of the sub tank apparatus B. When the fuel oil in the oil tank 3 decreases below a predetermined amount, this is detected by the liquid level sensor S1, and the pump P1 is driven. As a result, the fuel oil is supplied from the main tank 20 to the oil tank 3 of the sub-tank apparatus B and is replenished. The sub tank device B is provided close to the oil combustor 12, and since the pipe 21c connecting them is short, the amount of fuel supplied from the sub tank device B to the oil combustor 12 is the driving amount of the pump P2. Therefore, the combustion heat power can be properly controlled. The sub-tank apparatus B receives radiant heat from the oil combustor 12, and this radiant heat is blocked by the protective case 5 and the temperature rise of the oil tank 3 can be prevented as described above.

  Next, during the operation of the hot water supply apparatus A as described above, a situation may occur in which the pump P1 does not stop properly due to, for example, a failure in the liquid level sensor S1 or the control system of the pump P1. In this case, the fuel oil overflows from the oil tank 3, but this fuel oil leaks to the upper surface of the lid 4. This point will be described with reference to FIG. That is, in the sub tank device B, the lid body 4 is provided with air permeability so that when the fuel oil in the oil tank 3 is sucked by the pump P2, the oil tank 3 does not become negative pressure. Yes. For example, when the liquid level sensor S1 and the pump P2 are assembled to the lid body 4, this air permeability is ensured so that a minute gap is formed between the lid body 4 and the liquid level sensor S1. Of course, unlike this, it is also possible to adopt a configuration in which vent holes (not shown) are separately provided. Therefore, when the liquid level of the fuel oil in the oil tank 3 rises abnormally, the fuel oil leaks through the gap and leaks to the upper surface of the plate-like portion 40 of the lid 4 as indicated by an arrow N1, for example. It will be. Further, as indicated by an arrow N1 ', there is a case in which leakage occurs on the lid body 4 through a gap between the connecting portions of the pipe 21b.

  The fuel oil leaked onto the plate-like portion 40 of the lid body 4 flows toward the outer peripheral edge thereof and reaches the place where the standing wall 41 is formed. Next, the fuel oil passes through any part of the four slits 42 formed in the standing wall 41 as indicated by an arrow N2, and flows into the gap 43 between the two standing walls 31 and 41. The standing wall 31 serves to appropriately prevent the fuel oil from flowing downward from the outer peripheral edge of the oil tank 3 and prevent the lower region of the sub tank device B from being contaminated by the leaked fuel oil. Can do. The fuel oil that has flowed into the gap 43 then flows down from the outlet 32 onto the bottom 70 of the receiving member 7 as indicated by an arrow N3. Then, the oil sensor 6 detects the fuel oil and outputs a detection signal, so that it can be detected that a fuel oil leak has occurred in the sub tank device B. The detection of the fuel oil leak is performed when the fuel oil leaked on the lid 4 is guided to the receiving member 7 provided on the side of the oil tank 3. Therefore, the detection of the fuel oil leak can be performed at an early stage, and the countermeasures against the fuel oil leak can be taken early.

  Further, in this sub tank device B, when fuel oil leaks onto the lid 4, this is reliably guided to the receiving member 7 and detected by the oil sensor 6. Therefore, as long as the fuel oil leaks in a state in which the fuel oil leaks onto the lid 4, it is possible to detect all such oil leaks regardless of which part is malfunctioning. Furthermore, the detection of oil leakage is not limited to that in which fuel oil leaks from the oil tank 3 onto the lid 4. For example, even when a fuel oil leak has occurred in the connecting portion 210 of the connecting pipe 21c of the pump P2, the fuel oil flows down onto the lid body 4 so that it is appropriately detected by the oil sensor 6 thereafter. As described above, according to the subtank device B, the upper part of the lid body 4 functions as a receiving tray for collecting the leaked fuel oil, so that, for example, a fuel oil leak occurring in a portion different from the oil tank 3 is detected. Can also be used.

  When the oil sensor 6 outputs a detection signal, the control unit 19 executes control to forcibly stop the combustion drive of the oil combustor 12 immediately after receiving the detection signal. At that time, the pump P2 of the sub tank apparatus B is also stopped. Moreover, although the control which stops also about the pump P1 is performed, when the fuel oil leak has generate | occur | produced in the subtank apparatus B, possibility that the pump P1 has failed is high. Therefore, the control unit 19 closes the shutoff valve 22 and forcibly stops the supply of fuel oil from the main tank 20 to the sub tank device B. As a result, fuel oil leakage does not continuously occur in the sub tank apparatus B thereafter. Further, in addition to the above-described control, the control unit 19 performs notifying operations such as a screen display, lamp display, sound generation, or alarm sounding to notify the user that the fuel oil leakage has occurred. Give instructions to do so. With this notification operation, the user can accurately detect that fact and take appropriate measures such as contacting a maintenance company.

  In FIG. 4, the fuel oil received by the receiving member 7 flows into the protective case 5 from the notch 75 as shown by an arrow N4, and is received by the bottom 55d. Next, as shown by an arrow N5, the fuel oil flows into the pipe 21d from the discharge port 59 and is finally stored in the recovery container 99. In this way, each part of the hot water supply device A can be prevented from being contaminated by the leaked fuel oil. In addition, it is easy to collect the leaked fuel oil. Since the protective case 5 is effectively used as a means for guiding the leaked fuel oil to the recovery container 99, an effect of suppressing an increase in the total number of parts can be obtained.

  In the hot water supply apparatus A of the present embodiment, as described above, the detection of the fuel oil leakage is performed at an early stage, and countermeasures are taken such that the shutoff valve 22 is immediately closed when the detection is made. The amount of fuel oil leakage can be reduced. Therefore, instead of collecting the leaked fuel oil in the collection container 99, for example, the leaked fuel oil discharged from the discharge port 59 may flow down along the side wall portion 17a of the exterior case 17. Even if it does in this way, the amount of the sagging flow is very little, and there is almost no real harm.

  7 to 9 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 configuration shown in FIG. 7, the pipe connecting part 211 of the connecting pipe 21 d of the pump P <b> 2 is located at a location away from the region directly above the lid 4. On the other hand, a guide member 48 is attached to the lid body 4 so as to extend from above the lid body 4 to below the tube body connecting portion 211.

  According to such a configuration, when fuel oil leaks in the tube connection portion 211, the fuel oil is guided to the lid 4 through the guide member 48. When the fuel oil is guided onto the lid 4 in this way, the fuel oil is thereafter detected by the oil sensor 6 as described above. Thus, in the present invention, the cover 4 can be provided with a fuel oil guide member to detect fuel oil leakage.

  In the configuration shown in FIG. 8, the first guide member 48 </ b> A is provided across the lid 4 from below the connecting portion n <b> 1 of the pipe 21 c to the oil combustor 12. The guide member 48A plays a role of guiding the fuel oil on the lid 4 after receiving the fuel oil in the event that fuel oil leaks in the connecting portion n1. A second guide member 48 </ b> B is provided under the protective case 5. The second guide member 48B receives the fuel oil when the fuel oil leaked onto the lid body 4 overflows from the lid body 4 or the oil tank 3 toward the outer periphery thereof. It serves as a guide to an appropriate location such as the discharge hole 170. According to such a configuration, the lower region of the sub-tank apparatus B is more thoroughly prevented from being contaminated by the leaked fuel oil, which gives a great sense of security to the user.

  In the configuration shown in FIG. 9, the lid body 4 has a simple flat plate shape and does not have a portion corresponding to the standing wall 41. Even with such a configuration, the fuel oil leaked onto the lid 4 can be appropriately blocked by the standing wall 31 of the oil tank 3, and is the same as the embodiment shown in FIGS. It is possible to obtain an effective action.

  In FIG. 9, the outflow port 32 is not provided in the standing wall 31 and is formed as a through hole penetrating the flange portion 30 of the oil tank 3. Even if it is such a structure, the effect | action similar to the case where the outflow port 32 is provided in the standing wall 31 is obtained. In addition, when forming the outflow port 32 in the standing wall 31, the structure which notches the whole height direction of the standing wall 31, the structure which notches the upper edge part vicinity of the standing wall 31, the height direction intermediate part of the standing wall 31 Or you may employ | adopt any of the structure which forms a notch-shaped through-hole in the lower part.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the fuel oil sub-tank device and the combustion device according to the present invention can be varied in design in various ways.

  The oil tank only needs to have an upper opening shape capable of containing fuel oil, and the specific shape, size, material, and the like are not limited. The lid closes the upper opening of the oil tank, but does not necessarily need to cover the entire upper opening. In addition, the lid is provided with devices or parts for causing the fuel oil to flow into and out of the oil tank, but the specific types thereof are not limited.

  The oil sensor only needs to have a fuel oil detection function, and the principle and specific structure for detecting the fuel oil are not limited. The oil sensor is preferably attached to the oil tank or lid using an appropriate bracket, but it is not limited to this, and the oil sensor and the lid are attached separately. Also good.

  The combustion apparatus according to the present invention is not limited to a hot water supply apparatus. The present invention can be widely applied to all combustion apparatuses including an oil combustor. Further, the combustion method is not limited to the reverse combustion type, and it goes without saying that, for example, a normal combustion type in which fuel oil is burned upward can be used.

It is explanatory drawing which shows an example of the hot water supply apparatus with which this invention was applied. It is a perspective view which shows an example of the subtank apparatus for fuel oil to which this invention was applied. FIG. 3 is an exploded perspective view of the fuel oil sub-tank device shown in FIG. 2. It is sectional drawing of the subtank apparatus for fuel oil shown in FIG. It is VV sectional drawing of FIG. FIG. 3 is an exploded perspective view of an oil sensor mounting portion of the fuel oil sub-tank device shown in FIG. 2. It is principal part sectional drawing which shows the other example of this invention. It is principal part sectional drawing which shows the other example of this invention. It is a principal part schematic sectional drawing which shows the other example of this invention.

Explanation of symbols

A Hot water supply device (combustion device)
B Sub-tank device for fuel oil P1, P2 Pump S1 Liquid level sensor 3 Oil tank 4 Lid 5 Protective case 6 Oil sensor 7 Receiving member 12 Oil combustor 18 Remote control (notification means)
19 Control part 20 Main tank 22 Shut-off valve 31 Standing wall (of oil tank)
32 Outflow port 40 Plate-shaped part (of the lid)
41 Standing wall (additional standing wall)
59 Outlet

Claims (8)

And an oil tank having an upper opening, and a lid provided with an oil inflow / outflow means for closing the upper opening of the oil tank and allowing the fuel oil to flow into and out of the oil tank. ,
A sub-tank device for fuel oil that is provided and used in the middle of a fuel supply path from a main tank for storing fuel oil to an oil combustor,
The fuel oil is provided along the upper outer periphery of the oil tank so as to surround the outer periphery of the lid, and the fuel oil leaked onto the upper surface of the lid flows when the fuel oil flows toward the upper outer periphery. A standing wall that can be blocked on the lid or the oil tank;
An outlet provided in the upper outer peripheral edge or the standing wall so that the fuel oil blocked by the rising wall flows out to an outer region of the upper outer peripheral edge;
An oil sensor provided to detect the fuel oil flowing out from the outlet;
A sub-tank device for fuel oil, comprising: An oil receiving member for receiving fuel oil flowing out from the outlet,
The fuel oil sub-tank device according to claim 1, wherein the oil sensor is provided so as to detect fuel oil received by the oil receiving member.   The fuel oil sub-tank device according to claim 2, further comprising a case-shaped or frame-shaped protection member that covers the periphery of the oil tank. The oil receiving member is provided so that fuel oil received by the oil receiving member flows into the protective member,
The said protection member has the bottom part which receives the fuel oil which flowed in the inside from the said oil receiving member, and the discharge port which discharges the fuel oil received by this bottom part to this exterior of this protection member. Subtank device for fuel oil as described in 2.   The lid body leaks to the upper surface of the plate-like portion, a plate-like portion that closes the upper opening of the oil tank, an additional upright wall formed by bending the outer peripheral edge of the plate-like portion upward, and 5. The slit according to claim 1, further comprising: a slit that allows the fuel oil blocked by the additional upright wall to travel toward the upright wall of the upper outer periphery of the oil tank. Sub-tank device for fuel oil. A combustion apparatus comprising: an oil combustor; and a fuel oil sub-tank device provided in the middle of a fuel supply path from a fuel oil storage main tank to the oil combustor,
A fuel oil subtank device according to any one of claims 1 to 5 is used as the fuel oil subtank device.   The combustion apparatus according to claim 6, further comprising: a control unit that stops the combustion drive of the oil combustor when the oil is detected by the oil sensor, and notifies the fact by the notification unit.   8. The combustion apparatus according to claim 6, further comprising: a shut-off valve that shuts off supply of fuel oil from the main tank to the fuel oil sub-tank apparatus when oil detection is performed by the oil sensor.

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