JP2009092352A - Heating furnace system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating furnace system capable of extensively reducing fuel consumption by shortening a heating time (a drying time), and evenly carrying out heating without temperature difference in a vertical direction regardless of the size or shape of a heated object. <P>SOLUTION: In the heating furnace system, after continuously jetting hot air generated by a hot air generator 2 on the heated object 9 in a drying furnace 3 at a high speed and high pressure, the hot air is returned to the hot air generator 2 through a return duct 1. It has a target temperature control means 7 for controlling the hot air supplied to the drying furnace 3 to a target temperature, a blowout duct 11 installed so as to hold the heated object 9 in the drying furnace 3 from both sides, and a return fan 4 provided in the return duct to forcibly return the hot air exhausted from the drying furnace 3 to the hot air generator 2. Blowout nozzles 11a jetting out the hot air controlled to the target temperature by the target temperature control means 7 in cone shapes are plurally scattered on a face facing the heated object 9 of the blowout duct 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a heating furnace system that efficiently supplies hot air generated by a hot air generator into a drying furnace at a target temperature at a high pressure, and efficiently injects the object to be heated (to-be-dried object) by high-pressure injection in the drying furnace. About.

  Conventionally, an atmosphere type hot air drying furnace blows hot air generated by a hot air generator from a circulation duct into a drying furnace by a circulation fan, and the temperature in the drying furnace reaches a predetermined atmospheric temperature before drying an object to be dried. It is a drying furnace system. A temperature sensor is installed in the drying furnace, and the temperature in the drying furnace is controlled by the temperature detected by the temperature sensor.

Further, as other hot air drying furnaces, for example, there are techniques described in Patent Documents 1 to 4, but all are techniques for supplying hot air into the drying furnace and drying an object to be dried.
JP-A-6-269723 Japanese Patent Laid-Open No. 9-262529 JP 2004-141759 A JP 2006-247642 A

  However, in the atmosphere type hot air drying furnace and the hot air drying furnaces described in Patent Documents 1 to 4, the furnace body itself and the entire internal air cannot be dried until the set temperature is reached. It takes time to raise the temperature of the furnace to the set temperature by raising the temperature, and furthermore, the heat absorption rate due to heat transfer to the object to be heated is poor, so it takes time to heat up. There was a problem that the fuel cost was also bulky. In addition, since the atmospheric temperature is likely to vary depending on the height position in the furnace body, there is a problem that tall objects to be dried are liable to be heated due to temperature unevenness. Furthermore, since the atmospheric temperature varies even along the line direction of the furnace body, there is a problem that the object to be heated cannot be uniformly heated particularly in the case of a long object.

  The present invention has been made in order to solve such a problem, and by heating hot air at a set temperature directly onto a heated object in a compactly formed drying furnace, a heating time (drying) is achieved. Time) is shortened to about half compared to the conventional atmospheric hot air drying furnace, and it is heated evenly without temperature difference regardless of the size and shape of the object to be heated. An object of the present invention is to provide a heating furnace system that can greatly reduce the amount and can effectively use the work space by downsizing the drying furnace.

  The present invention solves the above problems by the following means.

  That is, (1) The present invention recycles hot air generated by a hot air generator after it is continuously injected at a high speed to a heated object in a drying furnace at a high speed and then circulated to the hot air generator through a circulation duct. A heating furnace system, the target temperature control means for controlling the hot air supplied to the drying furnace to a target temperature, the blowout duct installed so as to sandwich the object to be heated in the drying furnace from both sides, A circulation fan that is provided in a circulation duct and forcibly circulates the hot air discharged from the drying furnace to the hot air generator, and the target temperature control means sets a target on the surface of the blowout duct facing the object to be heated. A plurality of blowing nozzles for spraying hot air controlled by temperature in a substantially conical shape are formed.

  In the present invention, the temperature of the hot air generated by the hot air generator is set to the target temperature by the target temperature control means, which is supplied to the blowout duct in the drying furnace (hot air furnace). Hot air set at a high target temperature is directly sprayed directly from the outlet nozzle of the outlet duct to the object to be heated. At this time, the hot air is blown out substantially conically from the outlet nozzle. At this time, the hot air blown out in a conical shape from the plurality of blowing nozzles hits the object to be heated by a uniform wind speed distribution that forms a planar shape in a state of overlapping each other. As a result, even if the entire inside of the drying furnace does not reach the target temperature, the hot air itself flowing through the circulation system composed of the hot air generator, the drying furnace, and the circulation duct that communicates these reaches the target set temperature, It can be heated by spraying it directly onto the object to be heated.

  Thus, since the hot air controlled to the set temperature is blown directly like a shower so that there is no temperature unevenness, the heated object has a high heat absorption efficiency (for example, 90% or more). Heat absorption rate). Therefore, the object to be heated can be heated in an extremely short time (for example, about half an hour) even at the same temperature as the atmosphere-type drying furnace, the energy consumption consumed by the hot air generator can be saved, the heating work time can be shortened, As a result, it is effective in improving productivity and drastically reducing the cost of drying operations.

  (2) In the present invention, the blowing duct is erected substantially vertically from the floor of the drying furnace, and the blowing duct is disposed on both sides of the heated object along the direction in which the heated objects are arranged. The heating furnace system according to (1), wherein a plurality of the arrays are arranged at intervals.

  In such an invention, a plurality of blowing ducts are arranged on both sides of the object to be heated with a predetermined gap on the floor of the drying furnace. In other words, the blowout ducts are arranged in multiple stages. As a result, even hot objects to be heated can be injected with hot air having a uniform wind speed distribution from the blowing nozzles of these blowing ducts. Therefore, it becomes possible to manufacture a stable product by heating an object to be heated without causing temperature unevenness in the vertical direction. Moreover, even if the object to be heated is a long object, it can be produced in a horizontal drying furnace.

  (3) The present invention is also the heating furnace system according to (1) or (2), wherein a hot air adjusting damper for adjusting a flow amount of hot air is provided on an inflow side of the blowout duct. .

  In this invention, the hot air distribution area on the inflow side of the blowout duct can be variably set by the hot air adjustment damper provided in the blowout duct. For this reason, by setting the hot air flow area on the inflow side in the damper of the blowout duct located far from the hot air generator to be larger than that of the blowout duct located in the close position, the blowout duct located far from where the pressure loss occurs Also, the hot air having substantially the same pressure as the hot air supplied to the blowout duct located at a close position, that is, a sufficient amount of hot air can be supplied. Therefore, even in a deep drying furnace, it is possible to uniformly adjust and supply the wind speed distribution of the hot air sprayed to the heated object side surface. Thereby, a to-be-heated material can be heated with a form without temperature nonuniformity.

  (4) The present invention is also characterized in that an adjustment plate having an adjustment hole is slidably provided on the outer surface of the outlet duct at a position corresponding to the outlet nozzle. It is a heating furnace system described in the above.

  In this invention, when the adjustment plate portion is slid to shift the phase of the adjustment hole with respect to the blowing nozzle, the opening area of the blowing nozzle can be changed according to the overlapping state of the two. For this reason, by increasing the opening area of the blowing nozzle in the blowing duct located far from the hot air generator and reducing the opening area of the blowing nozzle in the blowing duct located in the near position, the wind speed of the hot air injected from the blowing nozzle The distribution can be blown out in a uniform state, and the object to be heated can be heated with no temperature unevenness. Furthermore, by narrowing down the blowing nozzles in this way, frictional heat can be generated between the passing air and the temperature of the air can be raised by this frictional effect. As a result, the heating cost can be reduced.

  (5) The present invention is also characterized in that the adjustment plate is constituted by an adjustment plate portion divided into a plurality of stages, and each adjustment plate portion is individually slid with respect to the blowing duct. It is a heating furnace system in any one of-(4).

  In such an invention, the opening area of the blowing nozzle can be individually adjusted over a plurality of stages in each blowing duct itself. For example, when the hot air is supplied from the lower side of the blowout duct duct in the case of dividing into two stages of the upper side and the lower side, considering the pressure loss on the upper side, the blower nozzle can be moved by sliding the upper adjustment plate part. The opening area is increased, and it is reduced by reducing the size of the blowing nozzle by sliding the adjustment plate portion below. Thereby, hot air can be uniformly blown from the blow nozzle to the object to be heated.

  (6) The heating furnace according to (4) or (5), wherein the blow nozzle and the adjustment hole formed in the adjustment plate are formed in a shape having substantially the same size. System.

  In such an invention, since the blowout nozzle and the adjustment hole are set to substantially the same size, the opening area of the blowout nozzle can be smoothly adjusted by sliding the adjustment plate or the upper adjustment plate portion and the lower adjustment plate portion. As a result, the hot air set to the target temperature can be uniformly blown against the object to be heated.

  (7) The target temperature control means in the present invention, a target temperature setting unit that sets a target temperature of hot air supplied to the drying furnace, a temperature sensor that detects the temperature of hot air generated by the hot air generator, A target temperature control unit for determining a level between a detected temperature detected by the temperature sensor and a target temperature set by the target temperature setting unit; and when the detected temperature is higher than the target temperature by the target temperature control unit If it is determined, the fuel supply amount to the hot air generator is decreased, and if it is determined that the detected temperature is lower than the target temperature, the fuel supply amount to the hot air generator is increased. The heating furnace system according to any one of (1) to (7), wherein:

  In such a configuration, the target temperature control unit in the target temperature control means can efficiently manage the target temperature of the hot air, so LPG (liquefied petroleum gas), city gas, consumed for generating hot air in the hot air generator, Energy consumption of electric heaters, steam, heavy oil, kerosene, etc. can be greatly reduced. In addition, by setting the target temperature to a low temperature, low temperature drying is possible, and operations such as assembly and packaging in the next process of the drying process are facilitated. Furthermore, the drying program can be freely adjusted by appropriately controlling the temperature and amount of blown hot air, the blowing flow rate from the blowing nozzle, and the like.

  According to the heating furnace system according to the present invention, the drying furnace can be downsized and its installation space can be effectively utilized, and the hot air in the hot air circulation system is kept at the set temperature even if the entire furnace does not reach the set temperature (target temperature). It can be used as soon as it reaches, so that the temperature of the object to be heated can be increased in a short time, and the object to be heated can be heated in about half the time even at the same temperature as a conventional atmospheric drying furnace The drying oven can be obtained.

  Hereinafter, an embodiment of a heating furnace system according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the schematic configuration of the heating furnace system includes a hot air generator 2 provided in the circulation duct 1, a drying furnace 3 to which hot air generated by the hot air generator 2 is supplied (sent), and a drying furnace. A circulation fan 4 that sucks hot air discharged from the air 3 and circulates it again to the hot air generator 2 under a predetermined high pressure, a supply unit (fuel tank) 5 that supplies fuel such as LPG and city gas, and a hot air generator 2, a temperature sensor 6 that detects the temperature of the hot air, and a target temperature control that controls the target temperature (set temperature) of the hot air generated by the hot air generator 2 based on the detection signal of the temperature sensor 6. It comprises constituent elements of means 7 and a fuel supply electromagnetic valve 8 for controlling the supply amount of fuel combusted in the hot air generator 2 based on the result of calculation processing by the target temperature control means 7. Hereafter, each said component is demonstrated concretely. In addition, the arrow in FIG. 1 shows the flow direction of hot air.

  The hot air generator 2 is supplied with fuel from the supply unit 5 and air from an inlet blower (not shown) and burns, and the hot air generated by the combustion energy at that time is supplied to the downstream drying furnace 3 by a circulation fan 4. Pumped. At this time, hot air having a temperature set to a desired target temperature is supplied to the drying furnace 3 by a target temperature control means 7 described later. In the present embodiment, hot air in the range of 50 to 350 ° C. is generated by the hot air generator 2 and supplied to the drying furnace 3.

  As shown in FIGS. 1 to 3, the drying furnace 3 has a rectangular parallelepiped inner space, and a chamber 3b is formed along the depth direction (perpendicular to the paper surface of FIG. 1) below the floor portion 3a. . Hot air generated by the hot air generator 2 is supplied to the chamber 3b so that the hot air is temporarily retained in a high pressure state. Moreover, the conveyor 3c formed so that the to-be-heated material 9 could be suspended and moved to the depth direction was provided in the center part of the ceiling part.

  On both sides of the object to be heated 9, a plurality of long box-shaped blowout ducts 11 are erected in a row at predetermined intervals substantially vertically above the floor 3 a via dampers 10 for adjusting hot air. In other words, the blow-out ducts 11 are arranged in multiple stages so as to communicate with the chamber 3b via the damper 10. As shown in FIG. 3A, the damper 10 is provided so as to be able to rotate integrally with a support shaft 10b pivotally supported by the damper duct 10a. The rotation position of the damper 10 is positioned by tightening the angle fixing bolt 10c, whereby the opening angle of the passage opening area on the hot air inflow side of the blowout duct 11 is appropriately adjusted between the fully closed state and the fully open state, The flow rate of hot air can be controlled.

  Since the opening angle of the damper 10 tends to decrease as the pressure of the hot air in the chamber 3b far from the hot air generator 2 increases, the opening angle of the blower duct 11 in the damper 10 increases as the distance from the hot air generator 2 increases. The angle is set so that it gradually increases. Thus, the amount of hot air supplied to the blowout ducts 11 at a distant location is prevented from decreasing, and consideration is given so that hot air can be supplied uniformly to each of the blowout ducts 11. It should be noted that the angle setting of the damper 10 is not limited to this, and it is needless to say that the damper 10 may be appropriately set according to the object 9 to be heated, the drying speed, and the like.

  The blowout duct 11 has a large number of blowout nozzles 11a formed on the surface on the side facing the article 9 to be heated, and the hot air inside blows out toward the article 9 to be heated, that is, jets. . As the shape of the flow opening of the blow nozzle 11a, various shapes such as a round hole, an oval, an ellipse, and a rectangle can be adopted.

  As shown by the dotted lines in FIGS. 1 and 2, the hot air jetted from the blowout nozzle 11a is blown out in a substantially conical shape, and the hot air blown out from the adjacent blowout nozzles 11a overlaps each other. It is worn like this. Of course, it is possible to set so that the hot air to be jetted does not have to overlap each other.

  On the outer surface of the blowout duct 11, that is, on the side where the blowout nozzle 11a is bored, an adjustment plate 12 composed of two upper adjustment plate portions 12a and 12b that can be slid up and down slightly. Is provided. Each of the adjustment plate portions 12a and 12b has an adjustment hole 12e formed at a position corresponding to the discharge nozzle 11a so as to have approximately the same size as the injection hole of the discharge nozzle 11a. Long holes 12c and 12d are formed in the adjustment plate portions 12a and 12b, and bolts 13 are inserted therethrough. As a result, as shown in FIGS. 3C and 3D, the adjustment plate portions are integrally positioned and fixed by screwing into the bolt holes 11b on the blowing nozzle 11a side. In this way, by adjusting the slides of the adjustment plate portions 12a and 12b with respect to the blowing nozzle 11a, the flow opening area can be freely adjusted to be large or small depending on the overlapping state of the adjusting hole 12e and the blowing nozzle 11a. In the present embodiment, the upper and lower two adjustment plate portions 12a and 12b are shown. However, the present invention is not limited thereto, and may be, for example, one adjustment plate portion. Three or more adjustment plate portions may be arranged in multiple stages. The number of stages may be adjusted as appropriate depending on the size of the object to be heated.

  In the adjustment of the flow opening area in the blow nozzle 11a, the pressure of hot air tends to decrease due to pressure loss as it is farther from the damper 10, so that the flow opening area of the blow nozzle 11a is increased by the upper adjustment plate portion 12a. It is preferable that the positioning adjustment is carried out by positioning and fixing so as to reduce the flow opening area by the lower adjustment plate portion 12b. Thereby, the amount of hot air ejected from the blowing nozzle 11a facing the upper adjustment plate portion 12a, that is, the flow velocity thereof, and the amount of hot air ejected from the blowing nozzle 11a opposed to the lower adjustment plate portion 12b, ie, the flow velocity thereof. Can be considered to be ejected to the article 9 to be heated in a substantially uniform state. As already described, the hot air moves in the blowout duct 11 at a high wind speed (preferably 10 m / sec to 30 m / sec) and the fine adjustment of the adjustment plate portions 12a and 12b synergistically works. Thus, it is possible to blow out the hot air that has been made extremely uniform from the blowout nozzle 11a. The adjustment of the flow opening area of the blowing nozzle 11a by adjusting the slide of the adjusting plate 12 is not limited to this as in the case of the damper 10, and is appropriately determined according to the object 9 to be heated, the drying speed, and the like. Needless to say, it may be set to be used.

  Thus, by adjusting the flow rate of the incoming hot air flow by adjusting the angle of the damper 10 and adjusting (controlling) the flow opening area of the blowing nozzle 11a by adjusting the slide of the adjusting plate 12, the vertical direction and depth direction with respect to the object 9 to be heated are adjusted. Therefore, it is possible to blow hot air having a uniform flow velocity (wind speed) at all times, and to heat the article 9 to be heated in a short time.

  The circulation fan 4 is provided in the circulation duct 1 and is operated at a static pressure of 0.9807 kPa to 2.942 kPa in the range of 10 to 30 m / sec. For example, when hot air is sent to the blowing duct 11 having a length of 10 m at a wind speed of 10 m / sec, the hot air reaches the tip in about 1 second, and thus it is possible to blow out uniform hot air with no temperature change. The hot air that has been subjected to the heat treatment is discharged from the drying furnace 3 by the suction effect of the circulation fan 4 and is circulated back to the hot air generator 2 via the circulation duct 1.

  Next, the target temperature control means 7 will be described. The target temperature control means 7 includes a target temperature setting unit 7 a that sets a target temperature of hot air supplied to the drying furnace 3, a temperature sensor 6 that detects the temperature of hot air generated by the hot air generator 2, and the temperature sensor 6. A target temperature control unit 7b for determining (comparison calculation) between the detected temperature detected in step 1 and the target temperature set by the target temperature setting unit 7a, and an open / close control signal is output to the fuel supply electromagnetic valve 8 based on the calculation processing result. And a driving unit 7c.

  When the target temperature control unit 7b determines that the detected temperature detected by the temperature sensor 6 is higher than the target temperature, the target temperature control unit 7b decreases the temperature of the hot air by reducing the amount of fuel supplied to the hot air generator 2. When it is determined that the detected temperature is lower than the target temperature, the amount of fuel supplied to the hot air generator 2 is increased to raise the temperature of the hot air so as to reach the target temperature, and the fuel supply electromagnetic valve 8 is turned on. Open / close control. As a result, hot air having a constant set temperature can always be supplied from the hot air generator 2 to the drying furnace 3.

  The operation of the heating furnace system having the above configuration will be described. When the fuel supplied from the supply unit is combusted in the hot air generator 2, hot air whose temperature is set by the target temperature setting unit 7a is generated, and FIG. As indicated by the arrow, the pressure is fed to the chamber 3b. The hot air flowing into the chamber 3b flows into the blowout duct 11 via the damper 10 opened at a predetermined opening angle. Hot air at a target (set) temperature is directly blown from the left and right sides of the article 9 to be heated from the blowout nozzle 11a set to a predetermined flow opening area by the upper adjustment plate 12a and the lower adjustment plate 12b. At this time, the hot air blown out from each blowing nozzle 11a overlaps in a substantially conical shape, becomes a plane, and is uniformly blown to the side of the article 9 to be heated and dried. The hot air blown into the drying furnace 3 is then sucked by the circulation fan 4 and discharged to the circulation duct 1, flows into the hot air generator 2 via the circulation fan 4, and is reused as hot air. .

  When the target temperature control unit 7b in the target temperature control means 7 determines that the set hot air temperature is lower than the set temperature, the fuel supply electromagnetic valve 8 from the drive unit 7c increases the supplied fuel. When it is determined that the temperature of the hot air is higher than the set temperature, the fuel supply is reduced. If it is determined that the hot air is at the set temperature, the fuel supply solenoid valve 8 maintains the current state. In this way, the target temperature control means 7 controls the opening of the electromagnetic valve 8, whereby the temperature of the hot air is controlled and the hot air having a constant desired temperature is always supplied to the drying furnace 3.

  According to this embodiment, through the control of the opening cross-sectional area of the inflow passage of the blowing nozzle 11 a by the damper 10 and the control of the opening cross-sectional area of the injection passage of the blowing nozzle 11 a by sliding of the adjusting plate 12, the object 9 is heated. By continuously injecting uniform and high-speed hot air, the article to be heated 9 can be efficiently heated. In particular, it is a structure that efficiently transfers heat by directly blowing hot air controlled to the target (set) temperature to the object to be heated instead of controlling the ambient temperature. The temperature can be raised. In addition, since hot air having a set temperature is blown onto the object to be heated, overheating and heating down can be reduced.

  Further, when an experiment was conducted by taking an object to be heated coated with a fluorine resin as an example, the result shown in FIG. 4 was obtained. According to this, when the temperature in the drying furnace 3 is set to 280 ° C. and the article 9 to be heated is put into the furnace, it takes about 22 minutes for the temperature in the drying furnace 3 to reach 280 ° C. On the other hand, it was found that the article to be heated 9 reached 250 ° C. in about 7 to 8 minutes. From this, 90% or more of heat is absorbed by the article 9 to be heated for 7 to 8 minutes. Therefore, even if the entire drying furnace 3 does not reach the set temperature, the drying operation can be started using the drying furnace 3 as long as the hot air flowing through the circulation system reaches the set temperature, and the productivity is increased accordingly. Can be greatly improved.

  In addition, since the hot air controlled to the set temperature is continuously sprayed from the blowing nozzle 11a to the heated object 9 at a high pressure, the heated object 9 can be heated in a short time, and the conventional atmosphere-type drying is performed. Heating and drying can be performed in half the time even at the same temperature as the furnace, and an energy-saving heating furnace system can be realized.

  In addition, frictional heat is generated in the blowout nozzle 11a only by the operation of the circulation fan 4, and this alone has the effect of raising the temperature of the drying furnace 3 to nearly 50 ° C. In this respect as well, it can save energy and, as a result, prevent global warming. It will be advantageous.

  Further, since the temperature control of the hot air is performed by controlling the fuel supply electromagnetic valve 8 by the target temperature control means 7, there is also an effect that the fuel cost can be greatly reduced. In addition, by setting the target temperature to a low temperature by high-pressure injection of hot air, low-temperature drying is possible, and operations such as assembly and packaging in the next process of the drying process are facilitated. Furthermore, there is also an advantage that the drying program can be adjusted freely by appropriately controlling the temperature and amount of hot air, the blowing flow rate from the blowing nozzle, and the like.

  Moreover, since the hot air is sprayed from the blow nozzle 11a so as to continuously blow the hot air onto the article 9 to be heated, no temperature failure occurs, and even the tall article 9 to be heated can be heated up and down evenly, A stable product can be obtained, and even a long object to be heated can be produced in a horizontal drying furnace.

  In the present embodiment, the hot air blown into the drying furnace 3 is collected by being guided to the return-side circulation duct 1 by the circulation fan 4 and returned to the hot air generator 2 to be recombusted. This configuration is advantageous because the fuel consumption rate can be reduced.

  Although the present invention has been described in detail with reference to the embodiment, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included in the scope of the present invention. It is.

  For example, in the above embodiment, the amount of hot air flowing into the blowout duct 11 is adjusted by rotating the damper 10 about the support shaft 10b. Instead, the configuration of the modification shown in FIG. You can also That is, the flange-shaped guide 10d is provided in the damper duct 10a, and the air volume adjusting plate 14 that is a flat plate-like damper is provided so as to be sandwiched between the guides 10d. By sliding the air volume adjusting plate 14 along the guide 10d, the opening 10e through which the hot air flows through the damper duct 10a may be variably controlled so that the cross-sectional area thereof is changed. The air volume adjusting plate 14 is formed with a bent flange 14a, and it is convenient to pick and slide it.

  With the configuration of such a modified example, the amount of hot air flowing into the blowout duct 11 can be changed to a large or small size as in the above embodiment.

  Moreover, although the said embodiment and the modification demonstrated the case where the blowing duct 11 was arranged facing both the right and left sides of the to-be-heated object 9, it was set as the aspect which blows off hot air to the to-be-heated object 9 from an up-down direction, It is also possible to use a mode in which hot air is blown out from four directions, or a mode in which hot air is blown out from six directions, top, bottom, left, and right.

  In the above embodiment, the temperature control of the hot air is performed by controlling the opening and closing of the fuel supply electromagnetic valve 8 by the target temperature control means 7 to control the amount of the supplied fuel. The set temperature can be controlled by controlling the rotational speed of the circulation fan 4 and adjusting the amount of air supplied to the hot air generator 2.

  In the hot air generator 2, hot air is generated by burning LPG or city gas. However, an electric heater is provided in the hot air generator 2, or a heat exchanger such as steam, heavy oil, or kerosene is provided. By doing so, it is good also as a structure which obtains a hot air by flowing air there and heating up air by heat transfer.

  The present invention can be used as a heating furnace system in heating, draining and the like of products such as metal, ceramics, plastic, and printing.

It is a whole lineblock diagram showing the heating furnace system concerning the embodiment of the present invention. Similarly, it is an external view which shows the internal structure of a drying furnace. Similarly, it is related with the structure of a blowout duct and a damper, (a) is an arrow sectional view in the BB line of (c), (b) is an appearance exploded view which exploded and showed a blowout duct, (c) is a blowout The external view of a duct and a damper, (d) is an arrow directional cross-sectional view in the AA line of (c). Similarly, it is a graph which shows the relationship between the temperature in the heat processing of the to-be-heated material coated with the fluororesin, and heating time. (A) is an external view showing the relationship between the blowout duct 11 and the air volume adjusting plate, (b) is an external view showing a state where the air volume adjusting plate is pulled out from the damper duct, and (c). (A) is a sectional view taken along the line CC of (a), (d) is a sectional view taken along the line DD of (c), and (e) is an external view of the air volume adjusting plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circulation duct 2 Hot air generator 3 Drying furnace 3a Floor part 3b Chamber 3c Conveyor 4 Circulation fan 5 Supply part 6 Temperature sensor 7 Target temperature control means 7a Target temperature setting part 7b Target temperature control part 7c Drive part 8 Fuel supply solenoid valve 9 Object to be heated 10 damper 10a damper duct 10b support shaft 10c angle fixing bolt 10d guide 10e opening
11 Blowout duct 11a Blowout nozzle 11b Bolt hole
12 adjustment plate 12a upper adjustment plate portion 12b lower adjustment plate portion 12c, 12d long hole 12e adjustment hole 13 bolt 14 air volume adjustment plate (damper)

Claims (7)

  A heating furnace system in which hot air generated by a hot air generator is continuously injected at a high speed into a heated object in a drying furnace at a high speed and then recirculated to the hot air generator through a circulation duct for reuse. Target temperature control means for controlling the hot air supplied to the drying furnace to a target temperature, a blow-out duct installed so as to sandwich an object to be heated in the drying furnace from both sides, a circulation duct provided in the circulation duct from the drying furnace A circulation fan that forcibly circulates the discharged hot air to the hot air generator, and the hot air controlled to the target temperature by the target temperature control means is substantially conical on the surface of the outlet duct facing the object to be heated. A heating furnace system characterized in that a plurality of spray nozzles that are jetted in the form of dots are formed.   The blowout duct is erected substantially vertically from the floor of the drying furnace, and a plurality of the blowout ducts are arranged at intervals on both sides of the heated object along a direction in which the heated object is arranged. The heating furnace system according to claim 1, wherein   The heating furnace system according to claim 1 or 2, wherein a hot air adjusting damper for adjusting a flow amount of hot air is provided on an inflow side of the blowout duct.   The heating furnace system according to any one of claims 1 to 3, wherein an adjustment plate having an adjustment hole formed at a position corresponding to the blowing nozzle is slidably provided on the outer surface of the blowing duct.   The said adjustment plate is comprised by the adjustment plate part divided | segmented into the multistage, and each adjustment plate part is individually slid with respect to the said blowing duct, The any one of Claims 1-4 characterized by the above-mentioned. Heating furnace system.   The heating furnace system according to claim 4 or 5, wherein the blowout nozzle and the adjustment hole formed in the adjustment plate are formed in a shape having substantially the same size. The target temperature control means is configured to detect a target temperature setting unit that sets a target temperature of hot air supplied to the drying furnace, a temperature sensor that detects a temperature of hot air generated by the hot air generator, and the temperature sensor. A target temperature control unit for determining the detected temperature and the level of the target temperature set by the target temperature setting unit;
When the target temperature control unit determines that the detected temperature is higher than the target temperature, the amount of fuel supplied to the hot air generator is decreased, and when the detected temperature is determined to be lower than the target temperature The heating furnace system according to any one of claims 1 to 7, wherein control is performed so as to increase a fuel supply amount to the hot air generator.

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