JP2015128496A - Rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary kiln capable of enhancing the thermal efficiency comparing to a prior art.SOLUTION: A rotary kiln 1 includes: an inner pot 2; an outer pot 3 for covering the outer periphery of the inner pot 2 while maintaining a space 30; a combustion chamber 4 disposed beneath the inner pot 2 in the space 30 between the inner pot 2 and the outer pot 3; an extension wall part 5 extending upward from the upper end edge of the combustion chamber 4 to the outer side surface of the inner pot 2; an exhaust path 6 for an exhaust gas E made up by a clearance 60 which is formed between a surface of the inner pot 2 side and the outer surface of the inner pot 2 in the extension wall part 5; and a blast type burner 7 mainly disposed beneath the combustion chamber 4 in the space 30 between the inner pot 2 and the outer pot 3, for ejecting to the combustion chamber 4 a premixed gas AF in which a fuel F and a forcibly supplied air A are mixed in advance. The minimum size of the clearance 60 is set within the range of 1 mm or more and 20 mm or less.

Description

  The present invention relates to a rotary hook.

  2. Description of the Related Art Conventionally, in kitchens and the like, rotary hooks that can take out the object to be heated heated in the hook by rotating the hook and tilting the pot are used.

  As this type of rotary hook, for example, in Patent Document 1, an inner pot that performs boiling, an outer pot that covers the periphery of the inner pot, a heat shield wall provided between the inner pot and the outer pot, An exhaust passage for combustion exhaust provided between the heat shield wall and the inner hook, and an outside air introduction path provided between the outer hook and the heat shield wall. A rotary hook is disclosed in which the lower end communicates with the exhaust passage side in the peripheral portion of the Bunsen burner and the outside air is supplied as combustion air of the Bunsen burner.

JP 2000-325230 A

  However, conventionally known rotary hooks have the following problems. That is, the conventional rotary hook requires a large amount of secondary air when the Bunsen burner is combusted. Therefore, the combustion chamber is cooled by a large amount of secondary air, and the thermal efficiency is deteriorated.

  Further, for example, when the exhaust port or the like is closed, the pressure in the combustion chamber increases, and secondary air cannot be sucked from the outside, leading to generation of CO and the like. Therefore, a rotary hook using a Bunsen burner needs to be designed with a large exhaust passage volume for exhausting exhaust gas generated by combustion. When the volume of the exhaust passage increases, the exhaust resistance decreases, so that the exhaust gas is not exhausted uniformly, but flows short-circuiting from the burner toward the exhaust chimney. Therefore, heat exchange by heat transfer cannot be sufficiently performed until the exhaust gas passes through the bottom of the kettle and is exhausted. Therefore, it is difficult to improve the thermal efficiency.

  The present invention has been made in view of the above background, and has been obtained in an attempt to provide a rotary hook capable of improving the thermal efficiency as compared with the conventional art.

One embodiment of the present invention provides:
An inner pot,
An outer pot that covers the outer periphery of the inner pot while maintaining a space;
A combustion chamber disposed below the inner pot in the space between the inner pot and the outer pot;
An extending wall portion extending upward from the upper edge of the combustion chamber along the outer surface of the inner hook;
An exhaust passage for exhaust gas composed of a gap formed between a surface on the inner hook side and an outer side surface of the inner hook in the extending wall;
A premixed gas, which is mainly disposed below the combustion chamber in the space between the inner hook and the outer hook, and is premixed with fuel and forcibly supplied air, is supplied to the combustion chamber. It has a blast type burner that can be ejected,
The minimum value of the size of the gap is set in a range of 1 mm or more and 20 mm or less.

  The rotary hook has the above-described configuration, and in particular, a blast burner is used as the burner. Therefore, the rotary hook does not require a large amount of secondary air during combustion, and the combustion chamber can be prevented from being cooled by a large amount of secondary air, thereby contributing to an improvement in thermal efficiency.

  In addition, the rotary hook has the above-described configuration, and in particular, the inner hook side surface of the extending wall portion extending upward from the upper end edge of the combustion chamber along the outer face of the inner hook and the outer side surface of the inner hook. A gap formed between the two is used as an exhaust gas exhaust passage, and the minimum value of the size of the gap is set within a range of 1 mm or more and 20 mm or less. Therefore, the rotary hook tends to improve the flow rate of the exhaust gas flowing through the exhaust passage. Furthermore, although the rotary hook has a greater exhaust resistance than the bunsen burner, it uses the positive pressure in the combustion chamber generated by the combustion of the blast burner, and the exhaust gas is evenly exhausted. Easily exhausted after passing through. Therefore, the exhaust gas is in sufficient contact with the outer surface of the inner pot, the heat transfer area is increased, the heat energy of the exhaust gas can be more easily exchanged, and the heat efficiency can be improved. The blast burner is forcibly supplied with air for combustion, so that the flammability is unlikely to deteriorate. Moreover, since the said clearance gap is used for the exhaust flow path of waste gas, it becomes easy to aim at size reduction of a rotary hook.

  Therefore, according to the present invention, it is possible to provide a rotary hook capable of improving the thermal efficiency as compared with the prior art.

  Moreover, since the rotary hook can improve the thermal efficiency, it can save the use of fuel and save energy. Moreover, the said rotary hook can also contribute to the discharge amount reduction of a carbon dioxide. Furthermore, the rotary hook can reduce the running cost of the rotary hook. Further, since the rotary hook sufficiently utilizes the heat energy of the exhaust gas for heating the inner pot, it becomes easy to reduce the exhaust gas temperature discharged, which is advantageous for downsizing the exhaust gas exhaust structure. Further, when the rotary hook is used as a rotary hook for a kitchen, for example, it is difficult to excessively raise the temperature in the kitchen by exhaust gas, which can greatly contribute to cool the kitchen environment. In this case, it is also advantageous to save the running cost of kitchen air conditioning.

It is a front view of the rotary hook of Example 1 (a state where a lid part is opened). It is a right view of the rotary hook of Example 1 (a state where a lid part is closed). FIG. 3 is a plan view of the rotary hook according to the first embodiment (a state where a lid portion is closed). FIG. 3 is a front view schematically showing the internal structure of the rotary hook according to the first embodiment. FIG. 3 is a right side view schematically showing the internal structure of the rotary hook according to the first embodiment. FIG. 3 is a plan view schematically showing the internal structure of the rotary hook according to the first embodiment. It is a fragmentary sectional view which shows typically the internal structure of the rotary hook of Example 1. It is explanatory drawing which shows typically the burner structure in the rotary hook of Example 1. FIG. It is explanatory drawing for demonstrating the structure of the exhaust flow path in the rotary hook of Example 1. FIG. FIG. 3 is a plan view schematically showing a burner head of a blast type burner in the rotary hook of the first embodiment. It is XI-XI sectional drawing in FIG. It is XII-XII sectional drawing in FIG. It is XIII-XIII sectional drawing in FIG. In the rotary hook of Example 1, it is a top view which shows typically the state which removed the inner hook.

  In the rotary hook, the minimum value of the size of the gap is set within a range of 1 mm to 20 mm. In addition, the minimum value of the size of the gap can be measured from an actual rotary hook or can be grasped from a design drawing of the rotary hook.

  If the minimum value of the gap is excessively large, the exhaust gas will be exhausted through the part with the smallest exhaust resistance, and the exhaust gas will not uniformly pass through the exhaust flow path, controlling the flow of exhaust gas. It becomes difficult. Therefore, it becomes difficult to sufficiently transfer the heat energy of the exhaust gas to the inner pot by heat transfer. Therefore, the minimum value of the size of the gap is preferably 19 mm or less, more preferably 18 mm or less, still more preferably 15 mm or less, even more preferably 13 mm or less, and even more preferably 10 mm or less, from the viewpoint of improving thermal efficiency. can do. On the other hand, if the minimum value of the size of the gap is excessively small, it is difficult to secure a constant gap stably at the time of manufacturing the rotary hook, and the mass productivity of the rotary hook decreases. Also, the pressure in the combustion chamber increases too much. Therefore, the minimum value of the size of the gap is preferably 1.5 mm or more, more preferably 2 mm or more, and further preferably 2.5 mm or more.

  The rotary hook is provided with a plurality of partition walls between the inner hook side surface of the extending wall portion in the gap and the outer surface of the inner hook, and the space between the adjacent partition walls is downward. It can be configured as an exhaust gas guiding path that promotes the exhaust of the exhaust gas from above to the top.

  In this case, exhaust of exhaust gas is urged from below to above by a plurality of exhaust gas guide paths provided in the gap. Therefore, in this case, in each exhaust gas guiding path, the exhaust gas flowing through each exhaust gas guiding path is sufficiently in contact with the outer surface of the inner pot facing each exhaust gas guiding path. Therefore, the heat energy of the exhaust gas can be exchanged without waste, and the thermal efficiency can be further improved. In addition, the heat distribution at the bottom of the inner hook can be easily made uniform, and cracking of the inner hook due to local heating can be easily suppressed.

  In the rotary hook, the partition wall may be formed of a member other than the inner hook and the extending wall portion, such as a rod-like member such as a round bar or a square bar, a plate-like member, or the extending wall. It is also possible to use a part of the inner hook or the extending wall part, such as a protrusion formed by protruding the surface of the inner hook side in the portion, a protrusion formed by protruding the outer surface of the inner hook . Preferably, from the viewpoints of productivity of the rotary hook, formability of the exhaust gas guiding path, cost reduction, and the like, the partition wall may be composed of a member different from the inner hook and the extending wall portion. Particularly preferably, the partition wall may be composed of a rod-shaped member. In this case, there are advantages such that it is easy to ensure the strength of the partition wall and it is easy to form a certain gap.

  When the partition wall is formed of a member different from the inner hook and the extending wall portion, the partition wall may be fixed to the surface of the extending wall portion on the inner hook side, It may be fixed to the side. Preferably, the partition wall is fixed to the surface of the extending wall portion on the inner hook side. In this case, it is easier to reduce the difference in thermal expansion than when the partition wall is fixed to the outer surface of the inner hook. Therefore, in this case, it is advantageous for improving the durability of the partition wall, and the gap and the exhaust gas guiding path can be easily maintained over a long period of time.

  In the rotary hook, the partition wall preferably functions as a spacer for forming a gap.

  In this case, the gap can be surely secured, and the minimum value of the size of the gap can be easily defined by the height of the partition wall. For example, in the case where the partition wall is composed of a rod-shaped member, the minimum value of the gap can be determined by the diameter of the rod-shaped member, and the minimum size of the gap can be determined by changing the diameter of the rod-shaped member. The value can be easily set.

  In the rotary hook, the partition wall has a right-handed or left-handed spiral shape when viewed from above, or a radial direction from the bottom to the outside so that the exhaust gas flows from the bottom to the top. It is preferably arranged so as to be guided.

  In this case, it is easy to induce exhaust gas from the bottom to the top. In particular, when the partition wall is arranged in a clockwise or counterclockwise spiral shape, compared with the case where the partition wall is arranged radially outward from the central portion, the exhaust gas is formed on the outer surface of the inner pot. Since the contact distance (time) can be increased, it is easy to make the heat distribution uniform, which is advantageous for improving the thermal efficiency.

  The rotary hook has an exhaust part for exhausting exhaust gas to the outside, and an exhaust gas restriction part for restricting the flow of exhaust gas to the exhaust part is provided in a gap around the exhaust part It can be.

  In this case, the exhaust gas restriction unit makes it easy to suppress the exhaust gas in the combustion chamber around the exhaust part from being exhausted from the exhaust part without performing sufficient heat exchange around the exhaust part. Therefore, this case is advantageous for improving the thermal efficiency.

  The exhaust gas restriction part is not particularly limited as long as it does not completely block the flow of exhaust gas. The exhaust gas restricting portion may be composed of a member other than the inner hook and the extending wall portion, such as a rod-like member such as a round bar or a square bar shape, a plate-like member, or the like. You may comprise using the inner hook and some extending wall parts, such as the protrusion formed by protruding the hook side surface, and the protrusion formed by protruding the outer surface of the inner hook. Preferably, from the viewpoints of productivity of the rotary hook, ease of control of the flow of exhaust gas, cost reduction, and the like, the exhaust gas restricting portion may be composed of a member other than the inner hook and the extending wall portion. Particularly preferably, the exhaust gas restricting portion may be composed of a rod-shaped member. In this case, there is an advantage that the exhaust gas restricting portion can be formed relatively easily.

  In addition, the exhaust gas restricting portion can be specifically disposed along the circumferential direction on the surface of the extending wall portion on the inner hook side. Further, when arranging a plurality of exhaust gas restricting portions side by side in the circumferential direction, the exhaust gas restricting portion rotates with the outer end portion of one exhaust gas restricting portion arranged on both outer sides of the plurality of exhaust gas restricting portions when viewed from above. An angle formed by a line connecting the center of the hook and a line connecting the outer end of the other exhaust gas restricting portion disposed on both outer sides and the center of the rotary hook is within a range of 10 ° to 120 °, for example. Can be arranged as follows. In this case, it becomes easy to control the flow of the exhaust gas around the exhaust part to an appropriate state. The angle formed is preferably 15 ° or more, more preferably 20 ° or more, still more preferably 25 ° or more, and even more preferably 30 ° or more, from the viewpoint of ensuring the above effect. The angle formed above is preferably 110 ° or less, more preferably 100 ° or less, still more preferably 90 ° or less, and even more preferably 80 ° or less.

  In the rotary hook, the length of the portion where the size of the gap takes the minimum value can be set in a range of 50 mm or more and 550 mm or less when viewed in a longitudinal section.

  In this case, the exhaust gas easily exchanges heat with the inner pot, which is advantageous for improving thermal efficiency.

  The length of the portion where the size of the gap takes the minimum value is preferably 100 mm or more, more preferably 150 mm or more, and further preferably 200 mm or more, from the viewpoint of improving thermal efficiency. On the other hand, the length of the portion where the size of the gap takes the minimum value is preferably 500 mm or less, more preferably 400 mm or less, and even more preferably 300 mm or less, from the viewpoints of miniaturization and improvement of thermal efficiency.

  In the rotary hook, the inner hook can be made of stainless steel, cast steel, aluminum, copper, or the like.

  Of these, stainless steel has poor thermal conductivity compared to cast iron. However, the rotary hook can improve the thermal efficiency as described above. Therefore, high thermal efficiency can be ensured even if stainless steel, which is disadvantageous in terms of material efficiency, is used compared to cast steel. Therefore, in this case, a rotary hook excellent in cleaning with water and the like, hygiene management, durability and the like can be obtained. In addition, the said effect becomes large by making the said outer hook also from stainless steel. Moreover, when the inner pot is made of cast steel, it is easy to obtain high thermal efficiency in combination with the good thermal conductivity of cast iron. Moreover, it becomes easy to reduce the manufacturing cost of a rotary hook.

  The rotary hook can be applied to various uses. The rotary pot can be used for cooking in a kitchen, for example. In this case, the heating object put in the inner pot is ingredients to be cooked, soup and the like. Moreover, the said rotary hook can also be used for a medical use. In this case, the heating object put in the inner pot is, for example, a medical instrument that is used for boiling.

  In addition, each structure mentioned above can be arbitrarily combined as needed, in order to acquire each effect etc. which were mentioned above.

  Hereinafter, the rotary hook of an Example is demonstrated using drawing. In addition, about the same member, it demonstrates using the same code | symbol. Moreover, in each drawing, thickness is abbreviate | omitted about one part member.

Example 1
As shown in FIGS. 1-14, the rotary pot 1 of this example is used for various cooking in a kitchen, such as boiled food, fried food, soup, stir-fried food, and boiled food. It has a hook 3, a combustion chamber 4, an extending wall 5, an exhaust passage 6 for exhaust gas E, and a blast burner 7. Hereinafter, the rotary hook 1 of this example will be described in detail.

  The rotary hook 1 of this example rotates a pair of legs 10 that rotatably support the outer hook 3 in the air, the lid portion 11 of the inner hook 2, the inner hook 2, and the outer hook 3. And a mechanism 12. An arm portion 110 configured to be rotatable is provided at an upper end portion of one leg portion 10, and a lid portion 11 of the inner hook 2 is attached to a tip end of the arm portion 110. Therefore, it is possible to fit the lid 11 to the inner hook 2 or remove the lid 11 by rotating the arm 110 with the upper end of one leg 10 as a fulcrum. The other leg portion 10 is provided with an operation handle portion 120 connected to a rotation mechanism 12 by a gear mechanism, and the rotary hook 1 can be rotated around the support shaft in accordance with the rotation amount of the operation handle portion 120. ing. In addition, a control box 14 is provided at the tip of the column 13 that extends upward from the upper end of the other leg 10. In the control box 14, various operation buttons such as a power button 141, an operation start button 142, an operation stop button 143, a reset button 144, a thermal power adjustment knob 145, and a buzzer button 146 are provided.

  In the rotary hook 1 of this example, the inner hook 2 is a container in which a heating object to be used for heating is placed. The inner hook 2 has a hook bottom 21 and a hook side face portion 22 configured to increase in diameter upward from the outer peripheral edge of the hook bottom 21. The material of the inner hook 2 is stainless steel. The inner hook 2 may be configured such that the boundary between the hook bottom 21 and the hook side surface portion 22 is hardly distinguishable.

  In the rotary hook 1 of the present example, the outer hook 3 covers the outer periphery of the inner hook 2 while holding the space 30. That is, a space 30 exists between the outer side surface of the inner hook 2 and the inner side surface of the outer hook 3. The outer hook 3 has a first covering portion 31 that mainly covers the outer periphery of the inner hook 2 and a second covering portion 32 that mainly covers the outer periphery of the blast burner 7. An air inflow port 33 through which air from the outside flows into the space 30 is provided at the bottom of the second covering portion 32 serving as the bottom of the outer hook 3. A waterproof plate 331 is provided inside the air inlet 33 so that water does not enter the space 30 when the rotary hook 1 is washed. The upper end edge of the inner hook 2 is fixed to the upper end edge of the outer hook 3. The material of the outer hook 3 is stainless steel.

  In the rotary hook 1 of this example, the combustion chamber 4 is disposed below the inner hook 2 in the space 30 between the inner hook 2 and the outer hook 3. In this example, specifically, the combustion chamber 4 is formed in a cylindrical shape having an outer diameter smaller than the bottom 21 of the inner hook 2, and the upper end of the combustion chamber 4 is located below the bottom 21 of the inner hook 2. An opening is arranged. The material of the combustion chamber 4 is stainless steel. A heat insulating material 43 is attached to the outer surface of the combustion chamber 4.

  In the rotary hook 1 of this example, the extending wall portion 5 extends upward from the upper end edge of the combustion chamber 4 along the outer surface of the inner hook 2. The material of the combustion chamber 4 is stainless steel. Further, a heat insulating material 53 is attached to the surface of the extended wall portion 5 on the outer hook 3 side. A gap 60 is formed along the outer surface of the inner hook 2 between the surface on the inner hook 2 side of the extending wall portion 5 and the outer surface of the inner hook 2. In the rotary hook 1 of this example, the exhaust gas exhaust passage 6 is constituted by the gap 60.

  When the rotary hook 1 of this example is viewed in a vertical cross section, the gap 60 is formed between the bottom 21 portion of the inner hook 2 disposed outside the combustion chamber 4 and the bottom 21 portion of the extending wall 5. Compared with the facing portion (hereinafter, also referred to as “gap upstream region”), the hook side surface portion 22 of the inner hook 2 and the hook side surface portion 22 of the inner hook 2 in the extending wall portion 5 face each other. The space between the portions (hereinafter, sometimes referred to as “gap downstream region”) is configured to be narrower. In the downstream area of the gap, the size of the gap 60 (the distance between the outer surface of the inner hook 2 and the surface of the extending wall 5 on the inner hook 2 side) is set to a minimum value.

  In the rotary hook 1 of this example, the minimum value of the size of the gap 60 is set within a range of 1 mm or more and 20 mm or less. In this example, specifically, the minimum value of the size of the gap 60 is set to 10 mm. The length of the portion where the size of the gap 60 takes the minimum value is set to be approximately equal to the length of the downstream area of the gap, and in this example, is set to about 200 mm.

  The rotary hook 1 of this example has an annular channel 15 on the outer side at the upper end of the inner hook 2. The annular flow path 15 includes a projecting portion 151 projecting outward from the upper end edge of the extending wall portion 5, a contact portion 152 extending upward from the tip portion of the projecting portion 151, and abutting against the outer surface of the inner pot 2. , And a partition space 153 partitioned by the outer surface at the upper end portion of the inner hook 2. The exhaust passage 6 described above has a lower end communicating with the combustion chamber 4 and an upper end communicating with the annular flow passage 15. In this example, the exhaust gas E that has passed through the exhaust passage 6 is configured to be exhausted from a cylindrical exhaust portion 16 for exhausting the exhaust gas E to the outside through the annular passage 15.

  In this example, a plurality of partition walls 51 are provided between the surface of the extending wall portion 5 on the inner hook 2 side and the outer surface of the inner hook 2 as a spacer in order to form the gap 60 constituting the exhaust flow path 6. Is provided. Each partition wall 51 is comprised from the rod-shaped member, and is being fixed to the surface by the side of the inner hook 2 of the extending wall part 5 by welding etc. FIG. More specifically, each partition wall 51 is disposed in the downstream area of the gap. In addition, the rod-shaped member which comprises each partition wall 51 is made into diameter 10mm so that the minimum value of the magnitude | size of the clearance gap 60 can be prescribed | regulated. Each partition wall 51 is disposed in the circumferential direction of the shuttle, and between the adjacent partition walls 51 is an exhaust gas guiding path 52 that promotes exhaust gas E from below to above. In this example, the plurality of partition walls 51 are arranged so that the exhaust gas E is guided from below to above so as to form a counterclockwise spiral shape when viewed from above.

  In this example, a plurality of exhaust gas restricting portions 53 for restricting the flow of the exhaust gas E to the exhaust portion 16 are provided in the gap 60 around the exhaust portion 16. Specifically, the exhaust gas restricting portion 53 is arranged in the circumferential direction at an intermediate portion of the extending wall portion 5. More specifically, the exhaust gas restricting portion 53 is composed of a rod-like member like the partition wall 51 and is fixed to the surface of the extending wall portion 5 on the inner hook 2 side by welding or the like. However, the rod-shaped member constituting the exhaust gas restricting portion 53 has a diameter smaller than the minimum value of the size of the gap 60, and is set so as not to completely block the flow of the exhaust gas E. In this example, the exhaust gas restricting portion 53 has an outer end portion of one exhaust gas restricting portion 53 disposed on both outer sides and the center of the rotary hook 1 among the plural exhaust gas restricting portions 53 as viewed from above. The angle θ formed by the connecting line M1 and the line M2 connecting the outer end of the other exhaust gas restricting portion 53 disposed on both outer sides and the center of the rotary hook 1 is set to be about 100 °.

  In the rotary hook 1 of this example, the blast burner 7 is mainly disposed below the combustion chamber 4 in the space 30 between the inner hook 2 and the outer hook 3. Note that “mainly disposed” means that if most of the blast burner 7 is disposed below the combustion chamber 4, a part of the blast burner 7 is disposed in the combustion chamber 4. It means that it may be. In this example, the blast burner 7 is arranged in a state in which a burner head 71 described later slightly enters above the lower end opening of the combustion chamber 4, most of which is below the lower end opening of the combustion chamber 4. Is arranged.

  The blast burner 7 is particularly limited as long as the blast burner 7 is configured so that the premixed gas AF, in which the fuel F such as city gas and the air A that is forcibly supplied is mixed in advance, can be ejected into the combustion chamber 4. There is nothing. In this example, the blast type burner 7 is disposed at the lower end of the combustion chamber 4, and is provided below the burner head 71 and a burner head 71 having a plurality of flame holes 713 for ejecting the premixed gas AF into the combustion chamber 4. The premixed gas supply path 72 for supplying the premixed gas AF to the burner head 71, the fuel supply path 73 configured to be able to supply the fuel F to the upstream side of the premixed gas supply path 72, and below the burner head 71 And a blower 74 configured to be able to forcibly supply the air A on the upstream side of the premixed gas supply path 72. The blast burner 7 is accommodated between the inner pot 2 and the outer pot 3.

  In the blast burner 7, the burner head 71 specifically includes a head base 710 made of a plate material, and one surface of the head base 710 annularly formed so that an annular space 712 is formed along one surface of the head base 710. A head upper surface portion 711 covering the head, a plurality of flame holes 713 formed on the head upper surface portion 711 for ejecting the premixed gas AF, and a premixed gas for supplying the premixed gas AF formed on the other surface of the head base 710 And a connection portion 714 to which an end of the supply path 72 is connected. The material of the burner head 71 is stainless steel. In this example, the lower end opening at the bottom of the combustion chamber 4 is almost closed by the burner head 71. The distance between the head upper surface portion 711 of the burner head 71 and the lowermost portion of the bottom 21 of the inner hook 2 is set to about 80 mm.

  The head base 710 is provided with two connection portions 714, and the connection portions 714 are arranged at positions facing each other. In this example, the connection part 714 uses a socket to which the premixed gas supply path 72 can be connected. Further, a baffle plate 715 that changes the flow of the supplied premixed gas AF in the circumferential direction is provided in the annular space 712 above the connection portion 714. Specifically, the baffle plate 715 is disposed in parallel with the head base 710. The plurality of flame holes 713 are annularly disposed on the head upper surface portion 711 and are covered with a metal knit portion 716 made of metal fibers knitted in a knit shape. More specifically, the burner head 71 includes an inner ring flame hole portion 713a configured by annularly arranging a part of the plurality of flame holes 713 on the head upper surface portion 711, and an outer periphery of the inner ring flame hole portion 713a. The head upper surface portion 711 has an outer ring flame hole portion 713b configured such that the remaining flame holes 713 are annularly arranged. The flame hole 713 constituting the inner ring flame hole part 713b is covered with an inner metal knit part 716a made of metal fibers knitted in a knit shape, and the flame hole 713 constituting the outer ring flame hole part 713b is The outer metal knit portion 716b is made of a metal fiber knitted in a knit shape. The outer peripheral edge of the inner metal knit portion 716a and the inner peripheral edge of the outer metal knit portion 716b are welded to the head upper surface portion 711 between the inner ring flame hole portion 713a and the outer ring flame hole portion 713b. The inner peripheral edge of the inner metal knit portion 716a and the outer peripheral edge of the outer metal knit portion 716b are welded to the head upper surface portion 711, respectively.

  In the blast burner 7, the premixed gas supply path 72 is branched into two in the middle thereof. One branch path 721 is connected to one connection part 714 of the head base 710, and the other branch path 721 is connected to the other connection part 714 of the head base 710. That is, in this example, the premixed gas AF is supplied to the burner head 71 through the two branch paths 721.

  In addition, in this example, an electromagnetic valve 731 for controlling the air-fuel ratio of the premixed gas AF to be generated by proportional control is provided in the middle of the fuel supply path 73. A blower 74 (DC blower in this example) is connected to the electromagnetic valve 731 via an air flow switch (not shown). The blast burner 7 has an optimal air-fuel ratio by proportional control by the electromagnetic valve 731 between the fuel F supplied from a fuel source (not shown) through the fuel supply path 73 and the air A supplied from the blower 74. The premixed gas AF that is mixed and generated can be supplied to the premixed gas supply path 72. The fuel supply path 73 is drawn into the space 30 between the outer hook 3 and the inner hook 2 through the inside of the support shaft in one leg portion 10. In addition, a spark rod 41 connected to an igniter (not shown) is disposed in the combustion chamber 4 so that the premixed gas AF ejected from the burner head 71 can be ignited. In addition, a flame rod 42 connected to the control panel is arranged in the combustion chamber 4 so that a flame can be detected. In this example, a heat insulating material 44 is provided between the outer peripheral edge of the head upper surface portion 711 of the burner head 71 and the inner peripheral surface of the combustion chamber 4. The heat insulating material 44 has an inclined surface that is inclined from the head upper surface portion 711 toward the exhaust flow path 6. In addition, on the surface of the inclined surface of the heat insulating material 44, a reflection plate 45 that facilitates the exhaust gas E to be discharged to the exhaust flow path 6 is provided. Further, the concave portion 717 at the center of the head upper surface portion 711 formed in an annular shape is used as a drain storage portion for storing water droplets (condensation water) that fall down along the outer surface of the inner hook 2. A heat insulating material 718 is provided in the recess 717. The heat insulating material 718 also plays a role of absorbing and holding the water droplets. Note that a tray (not shown) or the like can be disposed in the recess 717.

  In the rotary hook 1 of this example, a shielding plate 75 for shielding the radiant heat of the burner head 71 is provided between the burner head 71 and the blower 74. In this example, specifically, the shielding plate 75 is disposed at a position about 30 mm below the burner head 71, and a space 753 is formed between the burner head 71 and the shielding plate 75. . More specifically, the shielding plate 75 has a peripheral through hole 751 at a position corresponding to the two connecting portions 714 protruding from the lower surface of the head base 710 of the burner head 71, and the premixed gas supply path The two branch paths 721 of 72 are connected to each connection part 714 in the state penetrated to the two through-holes 751 respectively. Further, a central connection hole 752 is formed in the central portion of the shielding plate 75 to which an end portion of a preheated air supply path 8 described later is connected. In this example, a heat insulating material 754 is provided on the lower surface of the shielding plate 75.

  The rotary hook 1 of this example has one end communicating with a space 753 formed between the burner head 71 and the shielding plate 75 and the other end connected to an air intake (not shown) of the blower 74. The preheated air supply path 8 is provided. In this example, specifically, one end of the preheated air supply path 8 is connected to the central connection hole 752 of the shielding plate 75. Thereby, in the rotary hook 1 of this example, the air A existing between the inner hook 2 and the outer hook 3 is sucked into the space portion 753, and the sucked air A passes through the preheated air supply path 8 to the air of the blower 74. It is configured to be supplied to the intake port.

  Next, heating by the rotary hook of this example will be described.

  The fuel F such as city gas is supplied to the upstream side of the premixed gas supply path 72 through a fuel supply path 73 from a fuel source (not shown). On the other hand, the air A flowing between the outer hook 3 and the inner hook 2 from the air inlet 33 provided at the bottom of the outer hook 3 is forcibly supplied to the upstream side of the premixed gas supply path 72 by the blower 74. Is done. In this example, specifically, the air A is sucked inwardly from the outside of the space 753 formed between the burner head 71 and the shielding plate 75, and the sucked air A is The air is supplied from the central portion of 753 to the air intake port of the blower 74 through the preheated air supply passage 8. In this way, the air A supplied to the blower 74 is forcibly supplied to the upstream side of the premixed gas supply path 72 by the operation of the blower 74. Further, as the air A in the rotary hook 1 is supplied to the premixed gas supply path 72 by the blower 74, fresh fresh air from the air inlet 33 provided at the bottom of the outer hook 3 flows into the rotary hook 1. Is taken in.

  The fuel F and air A supplied to the upstream side of the premixed gas supply path 72 are mixed at a predetermined air-fuel ratio, and a premixed gas AF is generated. The generated premixed gas AF flows in the premixed gas supply path 72 from below to above. In this example, since the premixed gas supply path 72 is branched from the middle, the premixed gas AF flows in each branch path 721 and flows into the annular space 712 in the burner head 71 from each connection portion 714. At this time, in this example, since the baffle plate 715 is disposed in the annular space 712 above each connection portion 714, the premixed gas AF hitting the baffle plate 715 flows in the circumferential direction of the annular space 712. It is changed and extends into the annular space 712.

  The premixed gas AF diffused into the annular space 712 is ejected into the combustion chamber 4 from a plurality of flame holes 713 formed in the head upper surface portion 711 of the burner head 71. When the premixed gas AF ejected from the flame hole 713 is ignited by the spark rod 41, the premixed gas AF is burned in the combustion chamber 4. The radiant heat of the burner head 71 due to combustion is shielded by the shielding plate 75, and diffusion downward from the shielding plate 75 is suppressed. When combustion is started, the air A sucked into the space 753 between the burner head 71 and the shielding plate 75 is preheated by the radiant heat. Then, the preheated air A is taken into the blower 74 through the preheated air supply path 8 and used for generating the premixed gas AF.

  Exhaust gas E (combustion gas) generated by the combustion of the premixed gas AF is sent to the exhaust passage 6 by the positive pressure in the combustion chamber 4 generated by combustion, and flows in the exhaust passage 6. In this example, the plurality of partition walls 51 described above are arranged in the exhaust flow path 6, and the exhaust gas guiding path 52 is formed between the adjacent partition walls 51. And the exhaust gas E is induced | guided | derived toward the upper direction from the downward direction by the some exhaust gas induction | guidance | derivation path 52 from the downward direction. At this time, in the portion of the exhaust gas guide path 52 where the exhaust gas restricting portion 53 is disposed, the flow of the exhaust gas from the lower side to the upper portion is restricted as compared with the portion where the exhaust gas restricting portion 53 is not disposed. The exhaust gas E flowing out from the upper end portion of the exhaust flow path 6 flows into the annular flow path 15 and is exhausted from the exhaust section 16.

  Next, the effect of the rotary hook of this example is demonstrated.

  The rotary hook 1 uses a blast burner 7 as a burner. Therefore, the rotary hook 1 does not require a large amount of secondary air during combustion, and the combustion chamber 4 does not need to be cooled by a large amount of secondary air, which can contribute to an improvement in thermal efficiency.

  Further, the rotary hook 1 is formed between the surface on the inner hook 2 side of the extending wall portion 5 that extends upward from the upper end edge of the combustion chamber 4 along the outer face of the inner hook 2 and the outer face of the inner hook 2. The gap 60 is defined as the exhaust gas flow path 6 of the exhaust gas E, and the minimum value of the size of the gap 60 is set within a range of 1 mm or more and 20 mm or less. Therefore, the rotary hook 1 can easily improve the flow rate of the exhaust gas E flowing through the exhaust passage 6. Furthermore, the rotary hook 1 uses the positive pressure in the combustion chamber 4 generated by the combustion of the blast burner 7, although the exhaust resistance of the exhaust gas E is larger than when a Bunsen burner is used. It is easy to exhaust through the exhaust passage 6 uniformly. Therefore, the exhaust gas E is in sufficient contact with the outer surface of the inner pot 2, the heat transfer area is increased, the heat energy of the exhaust gas E can be more easily exchanged, and the heat efficiency can be improved.

  In this example, a plurality of partition walls 51 are provided between the surface of the extending wall 5 in the gap 60 on the side of the inner hook 2 and the outer surface of the inner hook 2, and the partition walls 51 adjacent to each other. Is configured as an exhaust gas guiding path 52 that promotes the exhaust gas E from below to above. Therefore, in the rotary hook 1 of this example, the exhaust gas E is urged to be discharged from the lower side to the upper side by the plurality of exhaust gas guide paths 52 provided in the gap 60. Therefore, in the rotary hook 1 of this example, in each exhaust gas guide path 52, the exhaust gas E flowing through each exhaust gas guide path 52 is sufficiently in contact with the outer surface of the inner pot 2 facing each exhaust gas guide path 52. Therefore, the rotary hook 1 of this example can exchange the heat energy of the exhaust gas E without waste, and can further improve the thermal efficiency. Further, in the rotary hook 1 of this example, the heat distribution at the bottom of the inner hook 2 is also easily made uniform, and cracking of the inner hook 2 due to local heating is easily suppressed.

  Moreover, in this example, the partition wall 51 is comprised from the rod-shaped member. Therefore, the rotary hook 1 of this example has advantages such as easy securing of the strength of the partition wall 51 and easy formation of a certain gap. Further, the partition wall 51 is fixed to the surface of the extending wall portion 5 on the inner hook 2 side. Compared with the case where the partition wall 51 is fixed to the outer surface of the inner pot 2, it is easy to reduce the difference in thermal expansion. Therefore, the rotary hook 1 of this example is advantageous for improving the durability of the partition wall 51 and easily maintains the gap 60 and the exhaust gas guiding path 52 over a long period of time.

  In this example, the partition wall 51 functions as a spacer for forming the gap 60. Therefore, the rotary hook 1 of the present example can reliably secure the gap 60, and the minimum value of the size of the gap 60 can be determined by the diameter of the rod-shaped member constituting the partition wall 51, The minimum value of the size of the gap 60 can be easily set by changing the diameter of the rod-shaped member.

  Moreover, in this example, the partition wall 51 is arrange | positioned so that waste gas E may be induced | guided | derived toward the upper direction from the downward direction so that it may turn counterclockwise when it sees from upper direction. Therefore, the rotary hook 1 of this example tends to induce the exhaust gas E from the lower side to the upper side. In this example, in particular, the partition wall 51 is arranged in a counterclockwise spiral shape, so that the outer side surface of the inner pot 2 is compared with the case where the partition wall 51 is arranged radially outward from the center. The distance (time) with which the exhaust gas E contacts can be increased, the heat distribution can be easily made uniform, and this is advantageous in improving the thermal efficiency.

  Moreover, in this example, it has the exhaust part 16 for exhausting the exhaust gas E outside, and the exhaust gas restriction | limiting for restrict | limiting the flow of the exhaust gas E to the exhaust part 16 in the clearance gap 60 around the exhaust part 16 A portion 53 is provided. Therefore, in the rotary hook 1 of this example, the exhaust gas restriction unit 53 causes the exhaust gas E in the combustion chamber 4 around the exhaust part 16 to exhaust from the exhaust part 16 without sufficiently exchanging heat around the exhaust part 16. It is easy to suppress this, and it is advantageous for improving thermal efficiency.

  In this example, the blower 74 that is easily affected by the radiant heat of the burner head 71 can be arranged at a position as far as possible from the burner head 71. In particular, since the shielding plate 75 is provided between the burner head 71 and the blower 74, the shielding plate 75 shields the radiant heat of the burner head 71 and suppresses the diffusion of the radiant heat below the shielding plate 75. Can do. Since the blower 74 is usually provided with an electronically controlled motor, the blower 74 is easily affected by heat. According to the above configuration, the temperature of the blower 74 does not exceed the heat resistance temperature. Therefore, the rotary hook 1 of this example can improve the durability and reliability of the rotary hook 1. In this example, since the burner-related parts are arranged in the space 30 between the outer pot 3 and the inner pot 21, the burner-related parts can be easily waterproofed in the pot at the same time. Can be improved. Therefore, the rotary hook 1 of this example is easy to wash the rotary hook 1 with water, and the cleaning property is also improved.

  Further, in this example, air A existing between the inner hook 2 and the outer hook 3 is sucked into the space 753 between the burner head 71 and the shielding plate 75 and preheated by radiant heat. The preheated air is supplied to the blower 74 through the preheated air supply path 8. Therefore, since the rotary hook 1 of this example can warm the air A contained in the premixed gas AF in advance, it is easier to improve the thermal efficiency.

  In this example, the premixed gas supply path 72 has a plurality of branch paths 721 in the middle thereof, and the premixed gas AF is supplied to the burner head 71 through the plurality of branch paths 721. Therefore, in the rotary hook 1 of this example, the premixed gas AF is uniformly supplied to the entire burner head 71 by the plurality of branch paths 721, and the premixed gas AF is easily ejected from each flame hole 713 uniformly. Therefore, the rotary hook 1 of this example is easy to form a uniform flame, and the whole pot bottom 21 of the inner hook 2 is easily heated uniformly, which is advantageous in improving the thermal efficiency.

  In this example, the bottom of the combustion chamber 4 is closed by the burner head 71. Therefore, in the rotary hook 1 of this example, the combustion chamber 4 can be almost sealed, so that the air A existing between the inner hook 2 and the outer hook 3 is difficult to flow into the combustion chamber 4. . Therefore, in the rotary hook 1 of this example, the inside of the combustion chamber 4 becomes difficult to be cooled, which can contribute to the improvement of thermal efficiency.

  In this example, the plurality of flame holes 713 of the burner head 71 are covered with the metal knit portion 716. Therefore, the rotary hook 1 of the present example can uniformly heat the entire bottom portion of the inner hook 2 by surface combustion on the metal fiber surface in the metal knit portion 716, which is advantageous in improving thermal efficiency. In addition, the metal knit portion 716 makes it difficult for the flame to return, and it is easy to form a wide range of flames ranging from blue to red.

  In this example, the outer peripheral edge of the inner metal knit part 716a and the inner peripheral edge of the outer metal knit part 716b are welded to the head upper surface part 711 between the inner ring flame hole part 713a and the outer ring flame hole part 713b. Yes. Therefore, the standing flame is held and formed at the welding site. Therefore, even when the air ratio of the blast burner is large, lift combustion is easily suppressed and it is easy to prevent the flame from being blown out.

  Further, in this example, the burner head serves as a drain storage part for storing water droplets (condensation water) falling downwardly along the outer surface of the inner hook at the center part of the head upper surface part 711 formed in an annular shape. The concave portion 717 is provided. Therefore, the rotary hook 1 of this example can suppress the corrosion of the burner head 71 and the metal material constituting the metal knit portion 716 provided on the burner head 71, and improve the durability of the burner head. Can do. In this example, a heat insulating material 718 having a function of an absorbing material that absorbs and holds water droplets is provided in the recess 717. For this reason, the above-described effects are further enhanced.

  Moreover, since the rotary hook 1 of this example can improve thermal efficiency, it can save the use of the fuel F and is energy saving. Moreover, the rotary hook 1 of this example can also contribute to the reduction of carbon dioxide emission. Furthermore, the rotary hook 1 of this example can also reduce the running cost of the rotary hook 1. Further, since the rotary hook 1 of this example sufficiently uses the heat energy of the exhaust gas E for heating the inner pot 2, it becomes easy to reduce the exhaust gas temperature discharged, and the exhaust gas exhaust structure can be downsized. It is advantageous. In addition, the rotary hook 1 of this example hardly contributes to excessively raising the temperature in the kitchen by the exhaust gas, and can greatly contribute to making the kitchen environment cool. In this case, it is also advantageous to save the running cost of kitchen air conditioning.

<Experimental example>
The minimum value of the size of the gap constituting the exhaust passage was set to 3 mm, 6 mm, and 9 mm, and the thermal efficiency was obtained under various conditions. Table 1 shows thermal efficiency together with various conditions.

  As shown in Table 1, it can be seen that the thermal efficiency improves as the minimum value of the size of the gap becomes narrower. This is because the flow of exhaust gas is restricted by narrowing the gap, and the heat transfer area increases by exhaust gas being sufficiently in contact with the inner pot while flowing in the gap along the outer surface of the inner pot. This is because more heat energy of the exhaust gas can be exchanged. There is a possibility that thermal efficiency can be improved by further narrowing the gap. However, if the gap is excessively narrow, it becomes difficult to secure a constant gap at the time of manufacturing the rotary hook. There is a concern about the decline. Considering this point, it is sufficient that the minimum value of the size of the gap is 1 mm or more. Further, if the gap is excessively wide, the exhaust gas is exhausted through the portion having the smallest exhaust resistance, and the exhaust gas tends to be difficult to pass through the exhaust passage uniformly. Considering the above results, it is sufficient that the minimum value of the size of the gap is 20 mm or less, and particularly preferably 10 mm or less. From the results in Table 1, it was also confirmed that the thermal efficiency can be further improved by appropriately adjusting the distance from the burner head to the bottom of the pot.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example, A various change is possible within the range which does not impair the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Rotating hook 2 Inner hook 3 Outer pot 30 Space 4 Combustion chamber 5 Extending wall part 60 Clearance 6 Exhaust flow path 7 Blast type burner F Fuel A Air AF Premixed gas E Exhaust gas

Claims (8)

An inner pot,
An outer pot that covers the outer periphery of the inner pot while maintaining a space;
A combustion chamber disposed below the inner pot in the space between the inner pot and the outer pot;
An extending wall portion extending upward from the upper edge of the combustion chamber along the outer surface of the inner hook;
An exhaust passage for exhaust gas composed of a gap formed between a surface on the inner hook side and an outer side surface of the inner hook in the extending wall;
A premixed gas, which is mainly disposed below the combustion chamber in the space between the inner hook and the outer hook, and is premixed with fuel and forcibly supplied air, is supplied to the combustion chamber. It has a blast type burner that can be ejected,
The minimum value of the size of the gap is set within a range of 1 mm or more and 20 mm or less.   A plurality of partition walls are provided between the inner pot side surface of the extending wall portion in the gap and the outer surface of the inner pot, and the interval between the adjacent partition walls is from above to below. The rotary hook according to claim 1, wherein the rotary hook is an exhaust gas guiding path that prompts the exhaust gas to be discharged to the exhaust gas.   The rotary hook according to claim 2, wherein the partition wall is composed of a rod-shaped member.   The rotary hook according to claim 2 or 3, wherein the partition wall is fixed to a surface of the extending wall portion on the inner hook side.   The rotary hook according to any one of claims 2 to 4, wherein the partition wall functions as a spacer for forming the gap.   When the partition wall is viewed from above, the exhaust gas is guided from below to above so as to be clockwise or counterclockwise spiral, or radially outward from the center. The rotary hook according to any one of claims 2 to 5, wherein the rotary hook is disposed on the rotary hook.   An exhaust part for exhausting the exhaust gas to the outside is provided, and an exhaust gas restriction part for restricting the flow of the exhaust gas to the exhaust part is provided in the gap around the exhaust part. The rotary hook according to any one of claims 1 to 6.   The length of the part where the size of the gap takes the minimum value is set in a range of 50 mm or more and 550 mm or less when viewed in a longitudinal section. The rotary hook according to item.

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