JP2009293904A - Waste oil stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a waste oil stove in which the temperature of a waste oil feed port is increased owing to a low air cooling effect by natural convection to remarkably increase generation of carbide in the oil feed port, in the waste oil stove being adapted to supply waste oil such as waste food oil into a combustion chamber to constitute the oil basin and supply air onto an oil level of the oil basin by the natural convection to burn the waste oil. <P>SOLUTION: In the waste oil stove 1 adapted to supply waste oil into the combustion chamber 22 to constitute the oil basin 29 and supply air onto the oil level 42 of the oil basin 29 to burn the waste oil, the waste feed port 22c is provided on a bottom surface 22b of a storage part 22d of the oil basin 29, whereby the waste oil feed port 22c is opened into the waste oil during combustion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waste oil stove in which waste oil is supplied into a combustion chamber to form an oil reservoir, and air is supplied to the oil surface of the oil reservoir by natural convection to burn the waste oil, and in particular, the waste oil is supplied to the oil reservoir. The present invention relates to the arrangement and piping configuration of waste oil supply ports for supply.

In recent years, by using animal waste such as beef tallow, vegetable properties such as soybeans, and mineral waste oil such as lubricating oil, insulating oil, and engine oil instead of expensive kerosene, heating costs required for house cultivation etc. In order to reduce this, a waste oil stove with a special structure that can use waste oil as fuel is known.
Here, the ignition point of such waste oil is higher than that of kerosene, and there are many impurities contained in the waste oil, which is inferior in combustibility as it is, so the structure of the waste oil stove is conventionally in the combustion chamber. A technique for supplying a large amount of air onto waste oil that burns through the air pipe by arranging an air pipe having a large number of air ejection holes is known (for example, see Patent Document 1). Further, by aligning the ejection direction from the air ejection hole with a specific direction in a plane perpendicular to the combustion flame, the combustion flame rises in a spiral shape, and then another air jet is introduced into the spiral combustion flame. A technique for supplying a large amount of air from a hole is also known (for example, see Patent Document 2).
However, in any of the technologies, the air is forcibly blown from the air blowing holes toward the waste oil by using a blower, and the amount of oxygen on the waste oil is increased to increase the combustibility of the waste oil, so that the waste oil is completely burned. Therefore, the apparatus cost and maintenance cost required for the blower-related devices such as the blower and its controller are increased, and the waste oil stove is enlarged by the amount of space necessary for installing the blower-related devices.
Therefore, a technique for providing a convection structure in the waste oil stove that promotes natural convection in the combustion chamber, for example, a primary combustion chamber and a secondary combustion chamber are vertically opposed to each other, and a space between the primary combustion chamber and the secondary combustion chamber is provided. By connecting the two cylinders in communication, the high-temperature air that is taken in and rises from the air intake hole of one cylinder is reversed in the upper secondary combustion chamber and descends through the other cylinder. Then, natural convection consisting of a cycle of reversing in the lower primary combustion chamber and rising again through the one cylinder is generated, and this natural convection causes air to flow into the oil reservoir in the primary combustion chamber. A technology that enables continuous supply on the surface is considered, and according to this technology, there is no need to separately provide a blower-related device as described above, reducing equipment costs and maintenance costs and making waste oil stoves compact. Can be That.
JP-A-7-260157 Japanese Patent Laid-Open No. 2003-161212

However, when such a convection structure that promotes natural convection is provided in the waste oil stove, the waste oil flows down from the waste oil supply port arranged on the oil surface of the oil sump toward the lower sump, as in the past. With the waste oil supply configuration to be supplied, the temperature of the waste oil supply port placed in natural convection with a small air volume and small air-cooling effect is rapidly increased by combustion heat compared to the conventional case placed during forced air blowing by a blower. To rise.
When the temperature of the waste oil supply port reaches the carbonization temperature range in which carbonization proceeds, the waste oil in the vicinity of the waste oil supply port and impurities contained in the waste oil are rapidly carbonized, and the generated carbide accumulates in the waste oil supply port. . This tendency is particularly noticeable in waste oils of vegetable edible oils that are easy to solidify due to many impurities, the oil passage is narrowed by carbides in a short time, the amount of waste oil supplied to the oil reservoir is significantly reduced, and the waste oil supply port is complicated. Maintenance is reduced due to the need for cleaning, and thick accumulated carbides are peeled off and mixed again into the waste oil as impurities. The flammability of the waste oil deteriorates, causing incomplete combustion, and a large amount of smoke and odors. There was a problem of generating.
Further, the conventional piping to the waste oil supply port is a piping configuration that is penetrated into the combustion chamber from an external waste oil metering supply device or the like and is piped to the waste oil supply port in a high-temperature combustion atmosphere in the combustion chamber. Therefore, there is a problem that the waste oil in the pipe is heated to a high temperature while passing through the combustion chamber, and the generation and deposition of the carbide at the waste oil supply port is further promoted.
In addition, if it is not possible to sufficiently avoid the formation of carbides by operating the waste oil stove for a long time, the waste oil supply port is accessed by, for example, disassembling the primary combustion chamber, and the carbide deposited in the waste oil supply port is removed. Since it has been manually and mechanically removed, there has been a problem that the removal of carbide takes a lot of labor and burden, and the maintainability is further deteriorated.

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.
That is, in claim 1, in a waste oil stove in which waste oil is supplied into a combustion chamber to form an oil reservoir, and air is supplied to the oil surface of the oil reservoir by natural convection to burn the waste oil. By providing a waste oil supply port on the bottom of the part, the waste oil supply port during combustion is opened in the waste oil.
According to a second aspect of the present invention, there is provided a waste oil supply passage portion that guides waste oil to the waste oil supply port, and the waste oil supply passage portion is disposed in a heat insulating space provided below the combustion chamber.
According to a third aspect of the present invention, the waste oil supply passage section includes a maintenance cleaning port communicating with the waste oil supply port in addition to the supply oil passage to the waste oil supply port.
According to a fourth aspect of the present invention, the cleaning port opens on the opposite side of the supply oil passage with the waste oil supply port interposed therebetween.

Since this invention was comprised as mentioned above, there exists an effect shown below.
That is, in claim 1, in a waste oil stove in which waste oil is supplied into a combustion chamber to form an oil reservoir, and air is supplied to the oil surface of the oil reservoir by natural convection to burn the waste oil. By providing the waste oil supply port at the bottom of the part, the waste oil supply port during combustion is opened in the waste oil, so the waste oil supply port is not directly exposed to the high-temperature combustion atmosphere above the oil level of the waste oil. Since the temperature of the supply port does not reach the carbonization temperature range, it is possible to reliably prevent carbonization of waste oil in the vicinity of the waste oil supply port and impurities contained in the waste oil, preventing clogging of the waste oil supply port due to carbide, While improving the maintainability, it is possible to prevent combustibility of the waste oil by preventing the mixing of the carbides into the waste oil, and to prevent the generation of smoke or bad odor. In particular, it is possible to reliably prevent the generation and accumulation of carbides that are generated in large amounts in waste oil of vegetable edible oils that are rich in impurities.
In Claim 2, the waste oil supply path part which guides waste oil to the said waste oil supply port is provided, and this waste oil supply path part is arrange | positioned in the heat insulation space provided in the downward direction outside the said combustion chamber, Therefore A waste oil supply path part Can be provided outside the high-temperature combustion chamber to prevent the waste oil from being heated to high temperature by combustion heat while flowing through the waste oil supply passage, and further suppress the formation and accumulation of carbides at the waste oil supply port. be able to. In addition, the heat insulation space provided to thermally cut off the space between the lower surface and the floor surface of the high-temperature combustion chamber can be used as the installation space for installing the waste oil supply passage. There is no need to provide a separate installation space, and the waste oil stove can be prevented from becoming large.
According to a third aspect of the present invention, the waste oil supply passage section includes a maintenance cleaning port that communicates with the waste oil supply port in addition to the supply oil passage to the waste oil supply port. By inserting a cleaning tool such as a brush to the mouth, it is possible to easily remove the carbide accumulated in the waste oil supply port, and even if the generation of carbide cannot be avoided sufficiently by long-term operation of the waste oil stove, Since it is not necessary to remove the carbide from the waste oil supply port after decomposing the combustion chamber, the labor and burden of removing the carbide are reduced and the maintainability is further improved. In addition, a part of the waste oil supply path can be used to provide the cleaning port, and there is no need to provide a separate member for installing the cleaning port, thereby reducing the cost of components by reducing the number of components. be able to.
In Claim 4, since the said cleaning opening opens on the opposite side to the said supply oil path on both sides of the said waste oil supply opening, the cleaning opening is opened in the different side from a supply oil path, and from this cleaning opening When the cleaning tool is inserted, it is not obstructed by the supply oil passage, and the cleaning operation can be performed smoothly. The labor and burden for removing carbides are reduced, and the maintainability is further improved. In addition, the arrangement space of the supply oil passage and the cleaning port can be appropriately dispersed to reduce the arrangement space of the entire waste oil supply passage portion, which can contribute to downsizing of the waste oil stove.

  Next, embodiments of the invention will be described. 1 is a side view showing the entire configuration of a waste oil stove according to the present invention, FIG. 2 is a side view from a waste oil metering supply device to a waste oil combustion unit, FIG. 3 is a partially enlarged side sectional view of the waste oil metering device, and FIG. FIG. 2 is a partial cross-sectional view of a side surface from a waste oil metering device to a lower part of a waste oil combustion unit.

First, the whole structure of the waste oil stove 1 concerning this invention is demonstrated with reference to FIG.
The waste oil stove 1 stores waste oil in a waste oil combustion section 2 that takes in outside air by natural convection and burns waste oil, and stores the waste oil in a waste oil tank 5, and the waste oil tank 5 so that the amount of waste oil in the waste oil combustion section 2 is constant. Waste oil storage / supply unit 3 that supplies waste oil to the waste oil combustion unit 2 and waste oil of vegetable edible oil that is partially solidified in a waste oil can 6 (hereinafter referred to as “waste cooking oil”) And a waste oil intake section 4 that feeds the oil to the waste oil tank 5 while being heated and dissolved.

  In the waste oil intake part 4, the waste oil can 6 filled and sealed with waste edible oil from an edible oil production factory or the like is placed on the side of the waste oil tank 5, and the upper portion of the waste oil can 6 is opened. Thereafter, a waste oil dissolving device 7 is introduced from the upper opening 6a toward the inside. The waste oil dissolving device 7 includes a heating and melting device 8 having a horizontal ring-shaped heating element 8a at the lower end of a straight wire tube 8b, and an oil supply tube 10 connected and supported on the side surface of the wire tube 8b of the heating and melting device 8. And a strainer 9 that covers the end opening 10a at one end of the oil supply pipe 10 that passes through the ring of the heating element 8a and extends downward, and the heating and melting device 8, the strainer 9, and The oil supply pipe 10 is integrated to constitute the waste oil dissolving device 7.

  On the other hand, a waste oil delivery pump 11 is connected to the other end of the oil supply pipe 10, and the waste oil delivery pump 11 is provided with a motor switch 11a for turning on and off a pump motor (not shown). The switch 11a has a control configuration in which the waste oil delivery pump 11 is started when the waste edible oil in the vicinity of the waste oil dissolving device 7 is sufficiently dissolved. Further, the lower part of the waste oil tank 5 is communicated with the waste oil delivery pump 11 via a discharge pipe 12 with a check valve for preventing backflow.

  In such a configuration, when the waste oil dissolving device 7 is introduced into the waste oil can 6 from the upper opening 6a, a portion of the waste edible oil that is in a solid state is heated and dissolved by the heating and dissolving device 8, and the waste oil dissolving device is obtained. 7 is surrounded by waste cooking oil in a liquid state. Then, the motor switch 11 a is turned “ON”, the waste oil delivery pump 11 is started, and the liquid waste cooking oil is sucked, and the waste cooking oil passes from the oil supply pipe 10 through the waste oil delivery pump 11 and the discharge pipe 12. And injected into the lower part of the waste oil tank 5.

  In the waste oil storage / supply unit 3, a heating and heat insulation device 13 is installed below the waste oil tank 5 so as not to resolidify the waste cooking oil sent from the waste oil delivery pump 11. The apparatus 13 automatically generates heat when the waste cooking oil in the waste oil tank 5 falls below a predetermined temperature and heats the waste oil tank 5 from the bottom so that the waste cooking oil is always stored in a liquid state at a predetermined temperature. Yes. Further, an oil level sensor 14 is disposed above the waste oil tank 5. The oil level sensor 14 automatically operates when the amount of waste edible oil exceeds a specific amount and turns the motor switch 11a from "ON" to "". It is switched to “OFF” and the waste oil delivery pump 11 is stopped so that more than a specified amount of waste edible oil is not injected into the waste oil tank 5.

  The waste oil tank 5 is connected to a waste oil metering supply device 15, which will be described in detail later, through a pipe 16, and the waste oil metering device 15 has the waste oil tank 5 disposed at a high position. In such a case, the waste edible oil is not supplied to the waste oil combustion unit 2 more than necessary to stabilize the combustion. On the other hand, an auxiliary fuel tank 18 for storing fuel with excellent ignitability such as kerosene (hereinafter referred to as “ignition fuel”) such as kerosene is disposed above the fixed amount supply device 15 for waste oil. The auxiliary fuel tank 18 and the upper part of the waste oil metering device 15 are connected to each other through a pipe 17 with an injection valve 54 so as to be opened and closed.

  In such a configuration, the waste cooking oil stored in the waste oil tank 5 in a liquid state by the heat insulation device 13 is supplied from the pipe 16 to the waste oil combustion unit 2 through the waste oil quantitative supply device 15, At the time of initial ignition, which is difficult to burn only with the waste cooking oil, the ignition fuel is mixed into the waste cooking oil in the waste oil quantitative supply device 15 from the auxiliary fuel tank 18 through the pipe 17 so that the waste cooking oil is mixed. The ignitability has been improved to ensure ignition.

  In the waste oil combustion section 2, a waste oil combustion apparatus 21 and a waste oil supply passage section 19, which will be described in detail later, are provided side by side on the side of the waste oil constant supply apparatus 15. The waste cooking oil from the device 15 is automatically supplied into the waste oil combustion device 21 through the lower waste oil supply passage portion 19 until the amount reaches an appropriate amount.

Next, the waste oil combustion apparatus 21 will be described with reference to FIG.
A cylindrical primary combustion chamber 22, which is a main combustion section, is disposed at the lower part of the waste oil combustion device 21. A cylindrical second combustion chamber 22 having a diameter substantially the same as that of the primary combustion chamber 22 is disposed above the primary combustion chamber 22. The next combustion chamber 23 is coaxially arranged oppositely. Between the secondary combustion chamber 23 and the primary combustion chamber 22, a combustion cylinder 24 that is thinner than the combustion chambers 22, 23 is coaxially disposed. 22 and 23 are communicated with each other, and a large number of air intake holes 24 a are opened on the side surface of the combustion cylinder 24.

  A small-diameter bypass cylinder 25 is arranged in parallel on the radially outer side of the combustion cylinder 24, and the combustion chambers 22, 23 are also communicated by the bypass cylinder 25. A hole such as the air intake hole 24a is not opened. Further, an exhaust cylinder 27 is erected upward from the upper surface of the secondary combustion chamber 23 so that the inside of the secondary combustion chamber 23 is opened to the outside by the exhaust cylinder 27.

  In such a configuration, when the ignition port (not shown) is opened and the waste cooking oil in the oil reservoir 29 in the primary combustion chamber 22 is ignited, the waste cooking oil is combusted on the oil reservoir 29, and the high temperature combustion accompanying this combustion is performed. Gas and waste cooking oil vapor rise in the combustion cylinder 24. Then, outside air is sucked through the air intake hole 24a into the combustion cylinder 24 that has become negative pressure due to the upward flow, and the outside air is brought into a secondary combustion chamber together with the high-temperature combustion gas and waste cooking oil vapor. The waste cooking oil burns vigorously in the secondary combustion chamber 23.

  Most of the combustion gas containing air after the waste cooking oil burns in the secondary combustion chamber 23 is discharged to the outside through the exhaust pipe 27, while a part of the combustion gas gradually While being cooled, the bypass cylinder 25 descends and returns to the primary combustion chamber 22. As a result, a circulation path of combustion gas containing air is formed in the order of primary combustion chamber 22 → combustion cylinder 24 → secondary combustion chamber 23 → bypass cylinder 25 → primary combustion chamber 22, and natural convection passing through such a circulation path. By generating the above, the waste cooking oil having low ignitability is continuously supplied with air having a temperature higher than that of the outside air, thereby enabling stable combustion of the waste cooking oil.

  From the upper surface of the primary combustion chamber 22, a support cylinder 26 made of a structural material with the cylinder closed is erected on the opposite side of the combustion cylinder 24 from the bypass cylinder 25. Further, the lower surface of the secondary combustion chamber 23 is supported and fixed, and a part of the load of the secondary combustion chamber 23 and the exhaust cylinder 27 can be borne by the support cylinder 26, even if the combustion cylinder 24 In addition, even if the strength of the bypass cylinder 25 decreases due to the combustion heat during operation, it is not thermally deformed to improve the heat resistance and durability of the waste oil combustion apparatus 21 as a whole.

Next, the waste oil quantitative supply device 15 will be described with reference to FIGS.
The waste oil metering device 15 is provided with a storage case 34 for temporarily storing waste cooking oil from the waste oil tank 5 in an internal oil reservoir 43, and the upper opening of the storage case 34 is closed by a cover plate 35. ing. In addition, a lower end of a cylindrical float receiver 37 penetrates and is fixed to the center of the cover plate 35 in a plan view, and the upper end of the float receiver 37 is connected to an L-shaped pipe joint 36 and a straight coupling joint 55. On the other hand, a lower end opening 37 a is provided at the lower end of the float receiver 37 so as to face the oil reservoir 43. As a result, the waste edible oil from the waste oil tank 5 flows down from the pipe 16 to the oil reservoir 43 in the storage case 34 through the coupling joint 55, the pipe joint 36, and the float receiver 37. A heating element 56 is provided in the side wall of the storage case 34 so that the waste cooking oil is heated and kept warm even after flowing into the oil reservoir 43. .

  A concave portion 37b that opens downward is formed in the outer peripheral portion of the lower end opening 37a of the float receiver 37, and a rod-like float 38 oils the upper half of the oil reservoir 43 that is directly below the concave portion 37b. The float 38 floats upward from the surface 41, and the lower end opening 37 a of the float receiver 37 is closed by fitting the convex portion 38 a at the upper end of the float 38 with the concave portion 37 b of the float receiver 37. Thus, the on-off valve 44 composed of the float receiver 37 and the float 38 is configured.

  Further, in the on-off valve 44, the lower half of the float 38 is slidably inserted into a guide hole 39a inside a guide tube 39 that is erected at a substantially central portion in plan view of the bottom surface 34a of the storage case 34. In addition, the upper half of the float 38 is slidably inserted into a guide hole 40 a of a guide plate 40 supported and fixed to the inner wall of the storage case 34. As a result, the float 38 slides up and down in the guide holes 39a and 40a at the position directly below the float receiver 37 in accordance with the vertical fluctuation of the oil level 41 of the waste edible oil in the storage case 34 without being swayed from side to side. The convex portion 38a of the float 38 in the upper position can be fitted into the concave portion 37b of the float receiver 37 with high accuracy. The guide plate 40 is formed in an inverted V shape in a side view so that waste cooking oil flowing down from the lower end opening 37a gently flows into the oil sump 43 along the upper surface of the guide plate 40. In this way, air is prevented from getting into the oil reservoir 43 and impurities are prevented from diffusing as much as possible.

  In such a configuration, when waste cooking oil is supplied from the waste oil tank 5 to increase the amount of waste cooking oil, and the oil level 41 of the oil sump 43 rises from height 30 to height 31, In accordance with the rise, the tip position of the convex portion 38 a at the upper end of the float 38 (hereinafter referred to as “float position”) also rises from the height 32 to the height 33. Then, the convex portion 38a at the upper end of the float 38 is pushed and fitted into the concave portion 37b at the lower end of the float receiver 37 by the buoyancy received by the float 38 from the waste cooking oil, the lower end opening 37a is closed, and the on-off valve 44 is The “closed” state is entered, and the supply of waste cooking oil from the waste oil tank 5 is stopped.

  On the contrary, when the waste cooking oil flows out from the waste oil metering supply device 15 toward the waste oil combustion device 21 and the amount of oil in the oil reservoir 43 decreases and the oil level 41 descends from the height 31 to 30, the oil level 41 The float position is also lowered from the height 33 to the height 32 in response to the descent. Then, the convex portion 38 a at the upper end of the float 38 is separated from the concave portion 37 b at the lower end of the float receiver 37, the lower end opening 37 a is opened, and the on-off valve 44 is in an “open” state, so that the waste cooking oil is supplied from the waste oil tank 5. Resumed. By repeating such an opening / closing operation of the on-off valve 44, the oil level 41 of the oil sump 43 is automatically controlled so as to have a height 31.

  Here, the lower part of the oil sump 43 in the waste oil fixed amount supply device 15 is connected to the lower part of the oil sump 29 in the primary combustion chamber 22 in the waste oil combustion device 21 via a waste oil supply passage portion 19 described later. For this reason, the oil level 41 of the oil sump 43 in the waste oil metering device 15 and the oil level 42 of the oil sump 29 in the waste oil combustion device 21 are interlocked so as to be the same height. It is configured to move.

  Accordingly, when the waste cooking oil in the oil sump 29 in the primary combustion chamber 22 is burned and reduced, and the oil level 42 of the oil sump 29 is lowered from the height 31 to the height 30, the waste oil quantity supply is linked to it. The oil level 41 of the oil sump 43 in the device 15 is also lowered from the height 31 to the height 30, and the on-off valve 44 is in the “open” state as described above, and the waste cooking oil from the waste oil tank 5 is put into the oil sump 43. Supplied. Then, the supplied waste cooking oil is supplied from the oil reservoir 43 in the oil fixed amount supply device 15 until the oil level 42 of the oil reservoir 29 in the primary combustion chamber 22 returns from the height 30 to the height 31. The oil flows into the oil sump 29 in the primary combustion chamber 22 via the waste oil supply passage 19, and as a result, the waste cooking oil in the oil sump 29 is also automatically controlled so as to have a constant oil amount corresponding to the height 31. It will be.

  That is, the waste oil quantitative supply device 15 that supplies waste cooking oil to the middle of the oil path to the combustion oil reservoir 29 in the waste oil combustion device 21 so that the combustion oil reservoir 29 always has a constant oil amount is provided. The waste oil quantitative supply device 15 is provided with a communication structure with the combustion oil reservoir 29 so that the oil level 41 moves up and down in accordance with the amount of oil in the combustion oil reservoir 29. The amount of oil in the supply oil reservoir 43 is kept constant by supplying and stopping the waste cooking oil to and from the supply oil reservoir 43 by opening and closing according to the vertical movement of the oil surface 41 and the oil surface 41. Since the on-off valve 44 is provided to hold, the quantitative control of the waste cooking oil in the combustion oil reservoir 29 in the high-temperature combustion atmosphere can be performed remotely via the communication structure between the oil reservoirs 29 and 43. Complex, expensive considering heat resistance and durability Control mechanism becomes unnecessary, it is possible to extend the life of the reduction and equipment cost of the apparatus.

Next, the waste oil supply passage 19 will be described with reference to FIG.
A plurality of Z-shaped support legs 28 are fixed to the outer periphery of the lower surface 22 a of the primary combustion chamber 22, and the waste oil combustion apparatus 21 is stably mounted on the floor surface 45 by the support legs 28. Is placed. The waste oil supply path 19 is disposed in a heat insulating space 46 provided between the floor surface 45 and the lower surface 22a.

  By providing the heat insulating space 46, the lower surface 22a of the primary combustion chamber 22 heated to high temperature by the combustion heat is avoided from coming into direct contact with the floor surface 45, so that the floor surface 45 is heated by high heat. It is possible to prevent damage or, conversely, waste cooking oil in the oil sump 29 from being deprived of heat by the floor surface 45 and lowering the oil temperature and reducing the combustibility of the waste cooking oil.

  In this waste oil supply passage section 19, the outer side of the horizontal pipe 49 is connected to the tip of the discharge pipe 47 projecting laterally from the bottom side surface of the storage case 34 of the waste oil metering supply apparatus 15 through a straight pipe joint 48. The end is connected, and the inner end of the horizontal pipe 49 is connected to a first opening 50 a on one side of the three-way type pipe joint 50. The lower end of the vertical pipe 51 is connected to the second opening 50b on the upper side of the pipe joint 50, and the upper end of the vertical pipe 51 is substantially the center in plan view of the bottom surface 22b of the reservoir part 22d of the oil reservoir 29. It is penetrated and fixed from below to the waste oil supply port 22c opened in the section.

  Further, a third opening 50c is provided on the other side of the pipe joint 50, and the third opening 50c is disposed on the opposite side on the same axis as the first opening 50a. The inner end of the cleaning tube 52 is connected to the part 50c. The cleaning tube 52 extends outward, and at its extended end, a cleaning port 52a is opened outward, and a plug 53 is detachably attached to the cleaning port 52a. The cleaning port 52a is normally in a “closed” state with a stopper 53 attached, except when the waste oil supply port 22c is cleaned.

  In such a configuration, when the waste cooking oil in the oil reservoir 29 in the primary combustion chamber 22 burns and the amount of oil decreases, the waste cooking oil is linked to the discharge pipe of the waste oil quantitative supply device 15 as described above. The waste cooking oil that has flowed out from the pipe 47 is supplied from the pipe joint 48 to the oil reservoir 29 in the primary combustion chamber 22 through the horizontal pipe 49, the pipe joint 50, the vertical pipe 51, and the waste oil supply port 22c. . Thus, while the waste edible oil burns on the oil surface 42 of the oil reservoir 29, the waste oil supply port 22c is always immersed in the waste edible oil held at a sufficient amount of oil of a certain height 31. Never be exposed to a hot combustion atmosphere.

  That is, waste cooking oil as waste oil is supplied into a primary combustion chamber 22 as a combustion chamber to form an oil reservoir 29, and air is supplied onto the oil surface 42 of the oil reservoir 29 by natural convection to burn the waste cooking oil. In the waste oil stove 1, since the waste oil supply port 22c is opened in the waste cooking oil by providing the waste oil supply port 22c on the bottom surface 22b of the storage portion 22d of the oil reservoir 29, the waste oil supply port 22c is disposed in the waste cooking oil. The oil is not directly exposed to the high-temperature combustion atmosphere above the oil level 42, and the temperature of the waste oil supply port 22c does not reach the carbonization temperature range, so that it is contained in the waste cooking oil in the vicinity of the waste oil supply port 22c and the waste cooking oil. Impurity carbonization can be surely prevented, the clogging of the waste oil supply port 22c due to the carbide is prevented, the maintainability is improved, and the waste food oil is prevented from being mixed with the carbide. Ensuring flammability, it is possible to prevent the occurrence of smoke and odors.

  In addition, the waste oil supply passage portion 19 that leads the waste cooking oil from the waste oil quantitative supply device 15 to the waste oil supply port 22c is disposed in the heat insulating space 46 as described above. For this reason, compared with the case where the waste oil supply path part 19 passes the high temperature combustion atmosphere in the primary combustion chamber 22, the temperature rise of the waste edible oil which flows through the waste oil supply path part 19 is remarkably reduced. Without providing a separate space for disposing the supply passage portion 19, the heat insulating space 46 that has already been secured can be used.

  That is, a waste oil supply passage portion 19 that guides waste edible oil that is waste oil to the waste oil supply port 22c is provided, and the waste oil supply passage portion 19 is provided in a heat insulating space 46 provided below the primary combustion chamber 22 that is the combustion chamber. Therefore, the waste oil supply passage portion 19 can be provided outside the high temperature primary combustion chamber 22, and the waste cooking oil is prevented from being heated to high temperature by combustion heat while flowing through the waste oil supply passage portion 19. Further, the generation and deposition of carbides at the waste oil supply port 22c can be further suppressed. In addition, a heat insulating space 46 provided to thermally cut off the space between the lower surface 22a of the high temperature primary combustion chamber 22 and the floor surface 45 is filled in an arrangement space for arranging the waste oil supply passage portion 19. Therefore, it is not necessary to newly provide the installation space, and the waste oil stove 1 can be prevented from being enlarged.

  Further, in addition to the horizontal pipe 49 for supplying the waste cooking oil to the waste oil supply port 22c, the waste oil supply passage portion 19 is also provided with the cleaning pipe 52 having the cleaning port 52a as described above. By inserting a cleaning tool such as a brush through the opening 52a, the carbide accumulated in the waste oil supply port 22c or in the vicinity thereof can be quickly removed. Moreover, the cleaning pipe 52 is connected and supported by the same pipe joint 50 that connects the horizontal pipe 49 and the vertical pipe 51 for supplying waste cooking oil, and the cleaning pipe 52 communicating with the waste oil supply port 22c is connected to the primary combustion chamber. 22 separately, for example, the cleaning pipe 52 is fixed by a support member along the lower surface 22a of the primary combustion chamber 22, and then connected to the branch portion from the vertical pipe 51 via a pipe joint or the like. It is not necessary to prepare a support member, a pipe joint, etc. newly compared with a case. Further, as described above, the cleaning tube 52 is disposed on the opposite side of the horizontal tube 49, and is not interfered by the horizontal tube 49 when the cleaning tool is inserted into the cleaning port 52a. An attempt is made to prevent the heat insulating space 46 from being expanded in an attempt to arrange the horizontal tube 49 and the cleaning tube 52 on the same side.

  That is, the waste oil supply passage 19 includes a maintenance cleaning port 52a that communicates with the waste oil supply port 22c in addition to the horizontal pipe 49 that is a supply oil passage to the waste oil supply port 22c. By inserting a cleaning tool such as a brush from the port 22a to the waste oil supply port 22c, it is possible to easily remove the carbide accumulated in the waste oil supply port 22c, and to generate carbides by operating the waste oil stove 1 for a long time. Even if it cannot be avoided sufficiently, there is no need to remove the carbide from the waste oil supply port 22c after decomposing the primary combustion chamber 22 which is a combustion chamber. Is further improved. In addition, a part of the waste oil supply passage portion 19 can be used to provide the cleaning port 52a, and there is no need to separately provide a member for installing the cleaning port 52a. Reduction can be achieved.

  Further, since the cleaning port 52a is opened on the opposite side to the horizontal pipe 49 which is the supply oil passage across the waste oil supply port 22c, the cleaning port 52a is opened on a different side from the horizontal tube 49, When the cleaning tool is inserted from the cleaning port 52a, the horizontal tube 49 is not obstructed, and the cleaning operation can be performed smoothly. The labor and burden for removing carbides are reduced, and the maintainability is further improved. . In addition, the arrangement space of the supply oil passage and the cleaning port can be appropriately dispersed to reduce the arrangement space of the waste oil supply passage portion 19 as a whole, which can contribute to downsizing of the waste oil stove 1.

  The present invention can be applied to all waste oil stoves in which waste oil is supplied into a combustion chamber to form an oil reservoir, and air is supplied to the oil surface of the oil reservoir by natural convection to burn the waste oil.

It is a side view which shows the whole structure of the waste-oil stove in connection with this invention. It is a side view from a waste oil fixed amount supply apparatus to a waste oil combustion part. It is a side expanded partial sectional view of a waste oil fixed quantity supply device. It is side surface partial sectional drawing from a waste oil fixed amount supply apparatus to a waste oil combustion part lower part.

Explanation of symbols

1 Waste Oil Stove 19 Waste Oil Supply Path 22 Combustion Chamber 22b Bottom 22c Waste Oil Supply Port 22d Reservoir 29 Oil Reservoir 29
42 Oil level 46 Heat insulation space 49 Supply oil passage 52a Cleaning port

Claims (4)

  In a waste oil stove that supplies waste oil into a combustion chamber to form an oil reservoir and supplies air by natural convection on the oil surface of the oil reservoir to burn the waste oil, a waste oil supply port is provided on the bottom surface of the reservoir of the oil reservoir A waste oil stove characterized in that the waste oil supply port during combustion is opened in the waste oil.   The waste oil stove according to claim 1, wherein a waste oil supply passage portion for introducing waste oil to the waste oil supply port is provided, and the waste oil supply passage portion is disposed in a heat insulating space provided outside the combustion chamber. .   The waste oil stove according to claim 2, wherein the waste oil supply passage includes a maintenance cleaning port communicating with the waste oil supply port in addition to the supply oil passage to the waste oil supply port.   4. The waste oil stove according to claim 3, wherein the cleaning port opens on the opposite side of the supply oil passage with the waste oil supply port interposed therebetween.

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