JP4674252B2 - Hot air generator and hot air generator equipped with the hot air generator - Google Patents

Description

  The present invention relates to a hot air generator and a hot air generator equipped with the hot air generator, and more particularly to a hot air generator that can be used in a hazardous area where explosive gas or flammable dust exists, and the hot air generator. The present invention relates to a hot air generator provided with a wind generator.

  The painting of automobile bodies is usually at least three times: undercoating for the purpose of preventing rust on the surface to be coated (sheet metal), intermediate coating for antirusting and coloring by this undercoating, and topcoating that improves the appearance. And a so-called three-coat three-bake method in which the painted surface is dried between these three coating steps. Among these coating processes, oil-based paints having excellent smoothness, sharpness and weather resistance are usually used for intermediate coating and top coating.

  Oil paints are diluted with organic solvents and used, so that organic solvents, such as thinner, evaporate (volatilize) during painting operations, and if the evaporated solvent is inhaled by workers, it may cause health problems. . In addition, since this organic solvent is flammable, it must be handled with great care when used. On the other hand, the work place where the painting work is performed, such as a painting booth, needs to have an explosion-proof structure. Therefore, the equipment for that purpose is generally expensive.

  Since the oil-based paint has the above-mentioned problems, in recent years, an aqueous paint that is difficult to ignite and does not contain harmful components has been gradually used instead of the oil-based paint. However, because this water-based paint is diluted with water and used, the water content of this water-based paint is much slower than the organic solvent contained in the oil-based paint evaporates in a few seconds. The evaporation usually takes a few minutes. Therefore, in order to promote the evaporation of moisture and increase the work efficiency, the painting using this water-based paint usually has a heat zone between the painting booth and the painting drying furnace at the painting site of automobile manufacturers. Yes.

  For drying such a paint, a drying device is used, and various types of drying devices have been proposed so far (for example, see Patent Documents 1 to 3 below).

  For example, the drying apparatus disclosed in Patent Document 1 below includes an infrared heating unit supported by a movable stand and a blower attached above or below the infrared heating unit, and blows low-speed wind from the blower. It is what you do. According to this drying apparatus, since the blower that blows low-speed air is attached to the infrared heating unit, the drying state suitable for the water-based paint can be achieved. Moreover, the drying apparatus disclosed in the following Patent Document 2 includes a plurality of irradiation apparatuses that irradiate a surface to be dried with heat rays, a blower that injects high-temperature and high-pressure air through the respective irradiation apparatuses, a timing of injection, Control means for controlling the spray pattern and the like, and a movable stand that supports the irradiation device at an angle with respect to the surface to be dried are provided. Further, Patent Document 3 below discloses an drying device in which an infrared heater having a reflecting plate and an angle of an air blowing nozzle are set in a tangential direction of an outer tube of the heater means.

  Further, in a general painting site, a drying device including a spray nozzle, a movable support stand having a support column for mounting the spray nozzle, and a hot air blower for blowing hot air to the spray nozzle is used. ing. This drying device has a support stand installed in the painting booth, a hot air blower installed outside the booth, and these hot air blowers and the support stand are connected by a hose, from the hot air blower outside the painting booth. Hot air is blown to the spray nozzle in the booth, and sprayed onto the surface to be dried for drying.

JP-A-8-278080 (paragraphs [0015] to [0018], FIG. 2) JP-A-2005-172382 (paragraphs [0023] to [0026], FIG. 2) JP 2006-130440 A (paragraphs [0038] to [0040], FIG. 2) JP-A-6-186218 (paragraphs [0019] to [0014], FIG. 1)

  The drying device of Patent Document 1 ventilates the air above the painted surface to accelerate the volatilization of the solvent. Therefore, the air heated by the infrared irradiation by the ventilation is exhausted from above the surface to be dried, The heat of the painted surface is also taken away. For this reason, problems such as the need for high-power infrared irradiation on the painted surface and the need for long-time irradiation are latent. In order to solve this problem, the drying apparatus of Patent Document 2 has been devised. However, this drying device also has a structure with a low warm air temperature and a limited air volume, so it is difficult to shorten the drying time. Furthermore, since the drying apparatus disclosed in Patent Document 3 has the same configuration, a similar problem is latent.

  In addition, the drying device used in the general painting site can increase the blowing temperature if the capacity of the heater used in the hot air blowing device is increased, and the air volume increases if the capacity of the blower is increased. Since the distance from the hot air blower with a built-in heater and blower to the spray nozzle becomes long, it takes a long time to inject hot air from the spray nozzle, and during this time there is a loss of heat energy and loss of drying time. It is generated and there is a limit to increase the efficiency of the drying process.

As described above, the painting operation of an automobile body or the like is performed in at least three painting steps of undercoating, intermediate coating, and topcoating. In order to realize the color development and the smoothness of the coating film, the intermediate coating is usually performed by repeated coating in which the coating is sprayed and dried three to six times. When aqueous paint is used in coating, spray Contact and drying time of the paint, each one recoating of usually 60 seconds spraying of paint, it is the ratio of the dry 300 seconds, in this step, Compared with the spraying time of 60 seconds, the drying time of 300 seconds is extremely long. As a result, in the intermediate coating, the drying process time for evaporating the water component of the water-based paint occupies most of the time of the entire coating process, and the time is long.

  The spraying and drying treatment time of this paint can be shortened by raising the drying temperature in the drying process, but when this temperature is raised, the temperature of the coating film and the body rises, and then the sprayed paint It begins to dry before the grain of the powder spreads, and it does not get enough spread and it becomes a satin-like shape, or coating defects that leave the paint in a granular form are likely to occur, and on the other hand, if this temperature is lowered, the above The occurrence of coating film defects is suppressed, but the drying time is long. Therefore, in order to suppress the temperature rise of the surface to be coated and to shorten the drying time, it is necessary to perform a drying process under optimum conditions. In this respect, since a large-scale production facility can be introduced in a production plant such as an automobile, a drying apparatus and a drying booth capable of setting optimum drying conditions can be installed in the production facility. However, such a large-scale facility cannot be introduced in a general repair shop that performs painting repairs on automobiles that are already on the market, and even when such painting repairs are performed, painting repairs are not possible. Since three to six times of overcoating are employed, improvement in coating quality and shortening of the coating time are major issues in painting work using water-based paints. Furthermore, when an oil-based paint is used, the drying device is used in a hazardous area, so that an explosion-proof structure is required and the device becomes expensive.

  In addition, the drying devices disclosed in Patent Documents 1 to 3 generate hot air by blowing air to a plurality of infrared lamps. In such a hot air generator, the infrared lamp is exposed without being accommodated in a container or the like, and air is blown to the infrared lamp thus exposed to convert it into hot air, so the conversion efficiency of hot air However, it is large and heavy. In addition, these drying devices are used for drying paints using water-based paints, but even if water-based paints are used, if oil-based paints or other flammable materials exist at the painting site, If they are accidentally leaked, they may mix with air and create a dangerous atmosphere that may cause ignition or explosion. Of course, when used for drying oil-based paints, the risk is further increased.

  Such dangerous places are classified into a zero-type place, a one-type place, and a two-type place in the safety management regulations according to the time and frequency of existence of a dangerous atmosphere. The two types of places are defined as places that may generate a dangerous atmosphere in an abnormal state. Specifically, the following places (a) to (c) are targeted. (B) Dangerous materials are always handled, but they are sealed in a sealed container or facility, and they leak if the container or facility is damaged due to an accident or operation is mistaken. (B) Explosive gas is prevented from accumulating with a reliable mechanical ventilation device. However, if a ventilator failure occurs, explosive gas accumulates. (C) Locations where explosive gases may invade to dangerous concentrations in the vicinity of or adjacent to one type of location.

  And when using control equipment and electrical equipment in two kinds of places, the equipment usually has an explosion-proof construction or internal pressure explosion-proof construction so that these equipment will not become an ignition source and induce an explosion. Yes. For example, Patent Document 4 discloses a thermostatic chamber having an internal pressure explosion-proof structure. However, such an internal pressure explosion-proof structure cannot be easily applied to the above-exposed heat source. Moreover, even if it can be applied, the problems of the drying apparatus cannot be solved. There are also drying apparatuses that use gas or kerosene burner as a heat source. However, if such a drying apparatus is used for paint drying, a large-scale ventilation device is required and the apparatus becomes expensive.

  The present invention has been made in order to solve such problems of the prior art, and the object of the present invention is in a dangerous place where explosive gas vapor or flammable dust exists, particularly in two kinds of places. The object is to provide a hot air generator that can generate a large amount of hot air that is small and lightweight and that does not require a ventilator.

  Another object of the present invention is to provide an inexpensive hot air generator that stores heater heat to save energy, is compact and can be installed near a place where hot air is required, and can reduce heat loss in the air passage. There is.

  Still another object of the present invention is to provide a hot air generator that can be used for multiple purposes with the heater unit and the air blowing unit being unitized to simplify the increase and decrease of the heater capacity.

  Still another object of the present invention is to provide a hot air generator provided with the above hot air generator.

  Still another object of the present invention is to provide a hot air generator having a safety means for preventing overheating when air blowing is stopped.

In order to achieve the above object, a hot air generator according to the present invention includes a heater provided in a case provided with a supply port and a blow-off port and sealed around the periphery, and the gas supplied from the supply port is supplied to the heater. In the hot air generator that is heated and sprayed from the outlet, the case is partitioned into a heater chamber and a heat exchange chamber hermetically sealed, and the heat exchange chamber includes a heat storage member inside The heater chamber is equipped with at least one lamp heater, and the heat exchanger made of the heat storage member is a metal having a predetermined width and length. is modestly folded plate in the longitudinal direction consists a plurality of ventilation passages by forming the corrugations are formed, the heater chamber and the heat exchange chamber and one heater chamber of the heater chamber At least one heater unit that is a set including a heat exchange chamber disposed on the side is accommodated in the case, each heat exchange chamber of the heater unit communicates with the supply port and the outlet, and the case includes: It is composed of a fixed box provided with the supply port and a fixed box provided with the blow-out port, and ends of the plurality of heater units are sealed and fixed by the pair of fixed boxes, and the pair of fixed boxes The supply port and the blowout port formed respectively are provided on the side corresponding to the side walls of both the heat exchange chambers .

According to the invention, the case, since partitioned into a heat exchange chamber containing a heat exchanger and heater chamber which is sealed by housing the lamp heater therein made from the heat storage member, the heater chamber during use combustible This prevents the intrusion of volatile gases and enables use in hazardous locations where explosive gas vapors and flammable dust are present. In addition, since a heat exchanger made of a heat storage member is housed in the heater chamber and the heat exchange chamber in the heater chamber, the heat from the lamp heater is efficiently exchanged with hot air by the heat exchanger made of the heat storage member. Can be ejected from. That is, since heat from the lamp heater is stored in the heat storage member, a large amount of hot air can be generated efficiently. In addition, since the lamp heater and heat exchanger are only separated and stored in the case, it is possible to reduce the size and weight, and when used for drying, etc. Heat loss can be reduced. Furthermore, since a lamp heater is used, the thermal responsiveness can be improved compared to other heaters such as a sheathed heater. Furthermore, since a ventilation device is unnecessary, the device can be made at low cost.

Moreover, the heat exchanger composed of the heat storage member is formed with a plurality of ventilation paths by folding a metal plate having a predetermined width and length into a small width in the length direction to form a corrugated shape. The contact area with the air can be expanded to improve the heat exchange rate and increase the heat storage volume. Further, by forming a corrugated metal plate having a predetermined width and length into a small width in the length direction, the corrugation can be easily formed. Further, by forming the heat storage member or the like from aluminum or an aluminum alloy, the heat storage member is lightweight and has an excellent heat storage effect.

  In addition, the heater chamber and the heat exchange chamber each include at least one heater unit that includes one heater chamber and a heat exchange chamber disposed on both sides of the heater chamber. Each heat exchange chamber communicates with the supply port and the blowout port, and the case includes a fixed box provided with the supply port and a fixed box provided with the blowout port. Ends of the heater unit are sealed and fixed, and the supply port and the blowout port respectively formed in the pair of fixed boxes are provided on the side corresponding to the side walls of both the heat exchange chambers. Therefore, a hot air generator capable of generating a large amount of hot air with a small size and light weight can be obtained.

  In the hot air generator of the present invention, the heater chamber is preferably filled with a nonflammable purge gas having a pressure higher than the ambient pressure.

  According to the hot air generator of the present invention, since the non-combustible purge gas having a pressure higher than the ambient pressure is filled in the heater chamber, flammable gas or the like is less likely to enter the heater chamber during use, so that it is safer. Enables use in hazardous locations where explosive gas vapors and flammable dust are present

Further, warm air generator of the present invention, wherein the case, the heater unit is accommodated in a plurality said casing, each heater chambers of the heater unit is respectively provided a purge gas inlet and outlet The inlet and outlet are connected to a purge gas circulation system to adjust the gas pressure in each heater chamber.

  According to the above invention, since the heater chamber and the heat exchange chamber are unitized as a set, a multipurpose hot air generator capable of blowing a desired amount of hot air can be provided by combining any number of units. .

  According to the present invention, in the hot air generator described above, each heater chamber of the heater unit is connected to the inflow port of one adjacent heater chamber and the outflow port of the other heater chamber with a pipe, and is located at the end. The inlet or outlet of one heater chamber and the other outlet or inlet are connected to a purge gas circulation system to adjust the gas pressure in each heater chamber.

  According to the above invention, a purge gas circulation system in which a plurality of heater chambers are connected in tandem can be formed.

  The present invention is characterized in that, in the hot air generator, the heater chamber is coated with a heat-resistant infrared absorbing paint on an inner wall surface, and the lamp heater is a carbon lamp heater or a halogen lamp heater.

  According to the above invention, since the lamp heater uses a carbon lamp heater or a halogen lamp heater, the heat energy of the heating element can be directly transmitted to the heat storage body as radiant heat by infrared rays, and the heat is transferred by heat conduction. The thermal response of on / off is much better than that using, and accurate temperature control without overrun due to delay from the heat source becomes possible. Further, since the heater chamber is coated with the heat-resistant infrared absorbing paint on the inner wall surface, the heat from the lamp heater can be efficiently conducted to the heat exchanger in the heat exchange chamber.

  In the hot air generator according to the present invention, the heater chamber corresponds to the first temperature sensor and the outlet side or the vicinity thereof on the inner wall surface corresponding to the supply port side or the vicinity thereof of the heat exchange chamber. A second temperature sensor is provided on the inner wall surface.

  According to the above invention, since the first and second temperature sensors are provided in the heater chamber, the temperature in the heater chamber can be accurately detected, and the hot air generator can be operated normally based on the detected value. Alarm or operation stop is possible.

Moreover, the present invention is characterized in that, in the hot air generator, the case has an outer periphery covered with a heat insulating member.

  Moreover, according to said invention, by covering the circumference | surroundings of a case with a heat insulation member, the surface temperature of an outer periphery can be lowered | hung, the heat radiation from an inside decreases, and the loss of thermal energy can be decreased. Further, even if the operator touches the hot air generator during the painting operation, no burns or the like occur.

  The hot air generator of the present invention includes a blower that blows air to a supply port of the hot air generator, a purge gas supply device that supplies purge gas to the heater chamber, and the supply device. An internal pressure regulator connected to adjust the gas pressure in the heater chamber and control means for controlling the blower and the internal pressure regulator are provided.

  According to the above-described invention, flammable gas or the like does not enter the heater chamber during use, and it can be used in a dangerous place where explosive gas vapor or flammable dust exists. When used for drying or the like, the heat loss in the air passage can be reduced by disposing it near the object to be dried. Furthermore, since a ventilation device is unnecessary, the device can be made at low cost.

The present invention relates to the above-described hot air generator, wherein the blower blows air to the intake port of the hot air generator, the purge gas supply device that supplies the purge gas to the heater chamber, and the heater chamber connected to the supply device. An internal pressure regulator that adjusts the gas pressure of the heater, and a control unit that controls the blower and the internal pressure regulator, and the control unit controls the heater when a detection value of the first or second temperature sensor exceeds a reference value. This is characterized in that power supply to the vehicle is stopped or an alarm is generated.

  According to the above invention, since the first and second temperature sensors are provided in the heater chamber, the temperature in the heater chamber can be accurately detected, and the hot air generator can be operated normally based on the detected value. Alarm or operation stop is possible.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies a hot air generator for embodying the technical idea of the present invention and a hot air generator provided with the generator, and the present invention is limited to these. It is not intended to be specific, and other embodiments within the scope of the claims are equally applicable.

  With reference to FIGS. 1-6, the warm air generator which concerns on embodiment of this invention is demonstrated. 1 shows a hot air generator according to an embodiment of the present invention, FIG. 1A is a top view of the hot air generator, FIG. 1B is a side view of the hot air generator of FIG. 1C is a side view of the hot air generator 1A as viewed from the IC direction. 2A is a cross-sectional view taken along line IIA-IIA in FIG. 1B, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 1A. 3 is a top view showing a connected state of the heater chamber of the hot air generator of FIG. 1A, FIG. 4A is a cross-sectional view taken along line IVA-IVA of FIG. 1A, and FIG. 4B is an enlarged cross-sectional view of the IVB portion of FIG. . FIG. 5 is an exploded perspective view of the hot air generator of FIG. FIG. 6 is a plan view showing one end of the lamp heater of FIG.

Warm air generator 1, as shown in FIG. 1, a heater chamber 5 sealing the periphery is provided an outlet 9B ₁ to an inlet 9A ₁ and the other end of the purge gas at one end and accommodating the lamp heater therein, an internal A pair of first and second heater units 2A and 2B each having a ventilation path and containing a heat exchanger made of a heat storage member and having two heat exchange chambers 12A and 12B, respectively, with gas at one end and one end. The supply port 15B ₁ to be supplied and a pair of fixed boxes 15A and 15B provided with a blow-off port 15A ₁ for blowing warm air at the other end are sealed and fixed, respectively, and the outlet 9B _{1 of one} first heater unit 2A is provided. other and inlet 9A ₁ of the second heater unit 2B has a structure obtained by connecting a pipe 18 with. In the following description, the hot air generator is formed by the pair of first and second heater units 2A and 2B, but may be configured by one heater unit.

The warm air generator 1, between the outlet 9B ₁ inlet 9A ₁ and heater unit 2B of the heater unit 2A, as shown in FIG. 9, the purge gas supply source through a pressure regulator 23 (compressor) There are connected, while the blower 21 is connected to the supply port 15B ₁ of one of the fixed box 15B, the blowing nozzle 22 is used by being connected to the air outlet 15A ₁ of the other fixed box 15A.

Then, when the purge gas (compressed air) is supplied from the inlet 9A1 of _one of the first heater units 2A to the hot air generator 1, the purge gas passes through the heater chamber of the heater unit 2A and flows. from the outlet 9B ₁ through the pipe 18, flows into the inlet 9A ₁ other second heater unit 2B, it passes through the heater chamber of the heater unit 2B, and is discharged from the outlet 9B _1. Then, the pressure in each heater chamber of the first and second heater units 2A and 2B is adjusted to a pressure higher than the surroundings. Further, when air is supplied from the supply port 15B1 of the _one fixed box 15B, the supplied air is supplied to the heat exchanger composed of heat storage members in the heat exchange chambers of the first and second heater units 2A and 2B. are heated when passing through the flow passage, the hot air of a predetermined temperature from the blowing port 15A ₁ is blown.

  According to this hot air generator 1, the heater chambers of the first and second heater units 2A, 2B and the heat exchange chamber are hermetically separated, and the internal pressure of the heater chamber is higher than the ambient pressure. Therefore, even if this hot air generator 1 is used in a dangerous place where explosive gas vapor or flammable dust exists, it can be used safely. Hereinafter, each structure of this warm air generator is explained in full detail.

  The first and second heater units 2A and 2B have the same configuration. One heater unit 2A will be described with reference to the other heater unit 2B.

As shown in FIGS. 1, 2, and 4, the heater unit 2A includes three lamp heaters 3, and these lamp heaters 3 arranged at a predetermined interval inside, and a purge gas inlet 9A ₁ at one end. and the other end an outlet 9B ₁ purge is provided on the outer periphery of the side plate 6A, a heater chamber 5 sealed flat with 6B, a wide plate wall of the heater chamber, i.e. provided on the left and right plate wall of FIG. 4A, the internal And heat exchange chambers 12A and 12B equipped with four heat exchangers 13 made of heat storage members.

As the lamp heater 3, a carbon lamp heater is used. The carbon lamp heater, as shown in FIG. 6, the heating resistor of the strip-like having a predetermined width dimension and a length (carbon fiber, i.e., carbon) 3 ₁ and terminal portions connected to both ends of the resistor 3 ₃ and has, this resistor is transparent heat-resistant member, covered with a transparent quartz tube 3 _2, has a structure in which the inert gas is filled therein. The terminal 3 ₃ is lead wire 4 is connected, and is connected to an external power source. This carbon lamp heater has a characteristic that the infrared radiation efficiency is higher than that of a heating element such as an existing nichrome wire. The light spectrum radiated from the carbon lamp heater has a peak in the far-infrared region around 2000 nm to 4000 nm. This carbon lamp heater can transmit the heat energy of the heating element as radiant heat to the heat exchanger, has much better on / off thermal response than using a heater that transfers heat by heat conduction, and conducts heat from the heat source. Accurate temperature control without overrun due to the delay of. The lamp heater is not limited to a carbon lamp heater, and may be a halogen lamp heater.

  Further, by providing a space between the heater chamber and the plate wall, even if the heater surface is very hot, the conduction heat is cut off by the space, and a highly accurate temperature control becomes possible.

  As shown in FIG. 5, the heater chamber 5 includes a pair of side plates 6A and 6B slightly longer than the length of the heat generating portion of the lamp heater 3, and terminal boxes 9A and 9B for fixing both ends of the side plates 6A and 6B. These are made of aluminum or an alloy material thereof. The pair of side plates 6A and 6B have the same shape, and are assembled with one side plate turned upside down during assembly. One side plate 6A will be described.

  The side plate 6A is bent at a substantially right angle from the first side plate 6a having a large width so that the three lamp heaters 3 disposed at substantially equal intervals can be mounted, and the longitudinal edge of the side plate piece. It has a narrow second side plate piece 6b, and the overall shape is substantially L-shaped. The side plate 6 </ b> A is coated with a heat-resistant infrared absorbing paint on the surface facing the lamp heater 3. By applying this paint, the heat from the lamp heater can be efficiently conducted to the heat exchanger in the heat exchange chamber.

Of the pair of side plates 6A and 6B, three first to third temperature sensors 7a to 7c are fixed to one side plate 6B along the longitudinal direction of the wide first side plate piece 6a. Among the first to third temperature sensors 7a to 7c, the first temperature sensor 7a has a temperature detecting portion at the tip thereof fixed to a substantially central portion of the first side plate piece 6a, and other second and third temperatures. The sensors 7b and 7c are fixed so that their temperature detection parts are located further away from the central part. When the hot air generator 1 is assembled, this position is the place that is closer to the purge gas inlet 9A ₁ and the outlet 15A ₁ side in the air passage. As shown in FIG. 10, when the length of the heat generating part of the lamp heater 3 is set to 400 mm, the first temperature sensor 7a is substantially at the center of the air passage, and the second temperature sensor 7b is to air outlet 15A ₁ side from the central portion to fix the position of 80 mm. By fixing the first and second temperature sensors 7a and 7b at the above-mentioned positions, the first temperature sensor 7a has a substantially central temperature in the heater chamber 5, and the other second temperature sensors 7b have the outlet 15A _1. The temperature on the side, that is, the temperature close to the blowing nozzle 22 is detected. Although in FIG. 10 is not shown the third temperature sensor 7c, the sensor is fixed at substantially the same position as the temperature sensor 7b, detects the temperature of the air outlet 15A ₁ side, the temperature sensor 7b is a failure It is a backup sensor that uses the detected value instead. The thermistors are used for the three first to third temperature sensors 7a to 7c, and these are fixed by pressing members 8a and 8b, respectively. In this embodiment, to fix the first temperature sensor 7a at a substantially central portion of the air passage, locations closer to the supply port 15B ₁ side, and the second, third temperature sensor 7b, 7c to the outlet 15A ₁ side Furthermore, you may provide in the place where it approached.

  These side plates 6A and 6B are spaces in which one of the side plates is turned upside down so that the second side plate piece 6b contacts the surface of the other first side plate piece 6a and the three lamp heaters 3 are accommodated therein. Assemble to form. Terminal boxes 9A and 9B into which terminals of the lamp heater 3 are accommodated and purge gas flows are attached to both ends of the assembled side plates 6A and 6B.

  Each terminal box 9A, 9B has the same configuration. One terminal box 9A will be described with reference to the other terminal box 9B.

Terminal box 9A, as shown in FIG. 5, the main body 10 inside cavity of has an opening 10 ₀ at one end, and is formed with a lid 11 covering the opening of the body. Body 10 is vertically and horizontally has an opening 10 ₀ at one end surrounded by the plate member and the other end is formed in the cylindrical body of the angular type elongated closed by the closing plate 10b. Terminal portion and a pair of side plates 6A of the lamp heater 3 in the closing plate 10b, through holes 10 ₁ to the end of 6B is inserted is formed. Each terminal box 9A, 9B has an opening through which purge gas flows in and out of one wall 10a of each main body 10. In this embodiment, the opening of the terminal box 9A opening inlet 9A ₁ and terminal box 9B is a outlet 9B _1.

  The assembly of the heater chamber 5 will be described with reference to FIGS.

The heater chamber 5 is assembled by first combining the one side plate 6B, to which the three first to third temperature sensors 7a-7c are fixed, with the other side plate 6B upside down, and the lamp heater 3 is housed inside. The room is created by fixing the side plate edges in the longitudinal direction by welding or the like so that the space to be formed is formed. This room is a flat cylindrical case that is open at both ends and hermetically sealed. Then, by inserting the three lamp heater 3 from the opening of the one end of the cylindrical case, it is brought into contact with one end of the case to the through hole 10 ₁ of one of the terminal box 9A, the terminal unit 3 ₃ of the lamp heater 3 Is placed in a cavity in the terminal box. Similarly, it is brought into contact with the other end portion of the case to the through hole 10 ₁ of the other terminal box 9B, to position the terminal portion 3 ₃ a lamp heater 3 into the cavity of the terminal box. In this state, fixed by welding the both end portions of the case both terminal box 9A, the respective through-holes 10 _a portion of 9B. Three lamp heater 3, their terminal portion 3 ₃ a both terminal box 9A, positioned and fixed in 9B. In this state, the end of the cylindrical case is fixed to both terminal boxes 9A and 9B, and the openings of both terminal boxes 9A and 9B are open. The lamp heater 3 is accommodated in the cylindrical case and fixed to the terminal boxes 9A and 9B. However, after the terminal boxes 9A and 9B are fixed in advance in the cylindrical case, the lamp heater 3 is accommodated. Also good. Since each terminal box 9A, 9B is opened at its endmost part, a power source or the like is connected to the terminal of the lamp heater 3 using these openings. In this embodiment, one terminal box connects a power supply line (not shown) to the terminal of the lamp heater 3, and the other terminal box connects the terminals of the lamp heaters together. After these connections are completed, each opening is closed with the lid 11. Thereby, the assembly of one heater chamber is completed. The other heater chamber is assembled in the same manner.

  On the side wall surface of the heater chamber 5, heat exchange chambers 12 </ b> A and 12 </ b> B are provided in which the heat exchanger 13 is accommodated and an air passage is formed. Each heat exchange chamber 12A, 12B has the same configuration. One heat exchange chamber 12A will be described.

  The heat exchange chamber 12 </ b> A includes a pair of heat exchangers 13 and a cover body 14 that covers these heat exchangers 13. Each heat exchanger 13 has the same configuration.

  The heat exchanger 13 is configured by a wave-shaped heat storage member, that is, a heat storage fin. This heat storage fin uses a metal plate having a predetermined plate thickness and length, and is folded into a bellows shape so that the metal plate has a predetermined width, and the whole is corrugated. And a molded body having a gap between the bottom sides. Each gap is a ventilation path through which air passes. The top and bottom of the corrugations are U-shaped or V-shaped. The heat storage fin is formed of aluminum or an aluminum alloy. Further, it is preferable to treat the surface with black alumite. By applying this processing, the heat storage effect is improved. By making the heat storage member into corrugated fins, the contact area with air can be expanded and the heat storage volume can be increased. Further, by forming a corrugated metal plate having a predetermined width and length into a small width in the length direction, the corrugation can be easily formed. Furthermore, by forming the heat storage member from aluminum or an aluminum alloy, the heat storage member is lightweight and has an excellent heat storage effect.

  The cover body 14 is formed of a cover body having a relatively long bowl shape of a substantially U-shape with two heat exchangers 13 arranged in the longitudinal direction and covering a side surface in the longitudinal direction. , Aluminum or aluminum alloy.

  Both ends of the pair of first and second heater units 2A and 2B are sealed and fixed by fixing boxes 15A and 15B, respectively. These fixed boxes 15A and 15B have substantially the same configuration. One fixed box 15A will be described with reference to the other fixed box 15B.

As shown in FIG. 5, the fixed box 15A is surrounded by plate bodies 16a to 16c on the top, left and right, and has an opening 16d on the bottom, one on the front and the back is opened, and the other is closed. It consists of a box body 16 having a pair of U-shaped grooves 16 ₁ , 16 ₂ and a lid body 17 covering the bottom opening 16d, and is made of aluminum or an aluminum alloy. An opening through which air is supplied or blown is formed in each upper plate 16a of each fixed box 15A, 15B. In this embodiment, the opening of one of the fixed box 15B has an opening that air outlet 15A ₁ of the supply port 15B ₁ and the other fixed box 15A.

  The assembly of the hot air generator 1 will be described with reference to FIGS.

  The hot air generator 1 is composed of a pair of first and second heater units 2A and 2B. These units are assembled by sharing the fixed boxes 15A and 15B. The heater chamber 5 and the heat exchange chambers 12A and 12B of each unit have the same configuration.

  In assembling one of the first and second heater units 2A and 2B, first, the heater chamber 5 is assembled in the procedure described above. Next, heat exchange chambers 12 </ b> A and 12 </ b> B are formed adjacent to the heater chamber 5. These heat exchange chambers 12 </ b> A and 12 </ b> B abut two heat exchangers 13 on both side plate surfaces of the heater chamber 5, respectively, cover these heat exchangers 13 with cover bodies 14, and these cover bodies 14. Is fixed to both side surfaces of the heater chamber 5 by welding or the like. Thus, the heater chamber and the heat exchange chamber of one unit are coupled together. The heater chambers and heat exchange chambers of other units are integrated in the same manner.

The heater chambers and heat exchange chambers of these two integrated units are fixed at their both ends with fixing boxes 15A and 15B. One of one of the terminal box 9A of the heater chamber 5 in the U-groove 16 ₁ of one of the fixed box 15A, inserted respectively other terminal box 9B to the U-shaped groove 16 ₁ of the other fixed box 15B, a pair of heat The ends of the exchange chambers 12A and 12B are brought into contact with the inner surfaces of the closing plates 16e of the fixed boxes 15A and 15B. The U-shaped groove 16 ₂ of one of the fixed box 15A and the other one of the terminal box 9A of the heater chamber 5, respectively through the other terminal box 9B to the U-shaped groove 16 ₂ of the other fixed box 15B, a pair of heat The ends of the exchange chambers 12A and 12B are brought into contact with the inner surfaces of the closing plates 16e of the fixed boxes 15A and 15B. Thereafter, the lid 16 closes the openings 16d at the bottoms of the fixing boxes 15A and 15B. Thereby, the heater chamber 5 and the heat exchange chambers 12A and 12B of the first and second heater units 2A and 2B are sealed by fixing both ends thereof with the fixing boxes 15A and 15B. Thereafter, the inlet 9A ₁ of one of the first heater unit 2A outlet 9B ₁ and the other of the second heater unit 2B by connecting a pipe 18, and terminates the assembling of the hot air generator 1. Since it is formed of a pair of fixed boxes, it is easy to seal and fix a plurality of heater units.

  The warm air generator 1 preferably covers the outer periphery with a cosmetic exterior case (not shown). Further, it is preferable to cover the outer periphery with another exterior case, and further cover the periphery with a heat insulating member so that the surface temperature of the outer periphery is a predetermined temperature, for example, 40 ° C. or less. By covering with this heat insulating member, heat radiation from the inside is reduced, and loss of heat energy can be reduced. Further, even if the operator touches the hot air generator during the painting operation, no burns or the like occur.

The warm air generator 1, between the outlet 9B ₁ inlet 9A ₁ and heater unit 2B of the heater unit 2A, as shown in FIG. 9, the purge gas supply source through a pressure regulator 23 (compressor) There are connected, the blower 21 is connected to the supply port 15B ₁ of one of the fixed box 15A, blowing nozzle 22 is used by being connected to the air outlet 15A ₁ of the other fixed box 15B.

Then, when the purge gas (compressed air) is supplied from the inlet 9A1 of _one of the first heater units 2A to the hot air generator 1, the purge gas passes through the heater chamber of the heater unit 2A and flows. from the outlet 9B ₁ through the pipe 18, flows into the inlet 9A ₁ other second heater unit 2B, it passes through the heater chamber of the heater unit 2B, and is discharged from the outlet 9B _1. Then, the pressure in each heater chamber of the first and second heater units 2A and 2B is adjusted to a pressure higher than the surroundings. In addition, when air is supplied from the supply port 15B1 of _one fixed box, the supplied air flows through the heat exchanger composed of heat storage members in the heat exchange chambers of the first and second heater units 2A and 2B. are heated when passing through the road, the hot air of a predetermined temperature from the blowing port 15A ₁ is blown.

  As mentioned above, although the hot air generator which concerns on embodiment of this invention was demonstrated, this invention is not limited to this, It can change.

  The heater unit is fixed and sealed with a pair of fixed boxes. However, a case with a predetermined shape may be used, and the inside of the case may be divided into a heater chamber and a heat exchange chamber. Although the number of lamp heaters is three, the number is not limited to three and may be any number, that is, one to a plurality. In addition, the heater unit is configured by one heater chamber and two heat exchange chambers, but the heater chamber may be rectangular and a plurality of two or more heat exchange chambers may be provided.

  Furthermore, the hot air generator is made of a single unit formed by one heater unit, a plurality of these single units connected, or a plurality of paired heater units connected. May be.

  These hot air generators will be described with reference to FIGS. 7 shows a hot air generator 1A formed by one heater unit, FIG. 7A is a top view, FIG. 7B is a side view, and FIG. 8 is a hot air generator in which a plurality of paired heater units are connected. It is a top view of 1B.

  The hot air generator 1 </ b> A is composed of one heater unit. In the above heater unit, a terminal box and a fixed box were used, but without using these, a long cylindrical case was used, and the inside of the case was partitioned into a heater chamber and a heat exchange chamber, and at the end portion. A purge gas inlet, an outlet, a gas supply port, and a blowout port may be provided, respectively. Moreover, a plurality of such heater units may be connected.

  The hot air generator 1B is obtained by further adding one set of the pair of heater units.

  In the above embodiment, the heater chamber is filled with nonflammable purge gas. However, when a hot air generator is installed outside the hazardous area and hot air is sent to the hazardous area, the heater chamber is filled with nonflammable purge gas. You don't have to.

  These warm air generators have the following effects by having the above-described configuration.

  First, the hot air generator 1 is divided into a heater chamber in which a lamp heater is housed and sealed, and a heat exchange chamber in which a heat exchanger made of a heat storage member is housed. Since it is filled, flammable gas does not enter the heater chamber during use, and it can be used in hazardous areas where explosive gas vapor or flammable dust is present. In addition, since a heat exchanger made of a heat storage member is housed in the heater chamber and the heat exchange chamber in the heater chamber, the heat from the lamp heater is efficiently exchanged with hot air by the heat exchanger made of the heat storage member. Can be ejected from. That is, since heat from the lamp heater is stored in the heat storage member, a large amount of hot air can be generated efficiently. In addition, since the lamp heater and heat exchanger are only stored separately, it is possible to reduce the size and weight, and when used for drying, etc., dispose it near the object to be dried and heat loss in the air passage. Can be reduced. Furthermore, since a lamp heater is used, the thermal responsiveness can be improved compared to other heaters such as a sheathed heater. Furthermore, since a ventilation device is not necessary, the device can be manufactured at low cost.

  Furthermore, since the heater chamber and the heat exchange chamber are unitized as a set, a multipurpose hot air generator capable of blowing a desired heat capacity can be provided by combining any number of units. In addition, since a carbon lamp heater or halogen lamp heater is used as the lamp heater, the heat energy of the heating element can be directly transmitted to the heat storage body as radiant heat by infrared rays, much more than using a heater that conveys temperature by heat conduction. The on-off thermal response is good, and accurate temperature control without overrun due to delay of heat conduction from the heat source becomes possible. Further, since the heater chamber is coated with the heat-resistant infrared absorbing paint on the inner wall surface, the heat from the lamp heater can be efficiently conducted to the heat exchanger in the heat exchange chamber. Since the temperature sensor is provided in the heater chamber, the temperature in the heater chamber can be accurately detected, and the detected value enables the hot air generator to operate normally, and also allows an alarm or shutdown when abnormal.

  With reference to FIG. 9, FIG. 10, the warm air generator using this warm air generator is demonstrated. FIG. 9 is a hot air generator and its control block diagram. FIG. 10 is an explanatory view for explaining safety means of the hot air generator.

As shown in FIG. 9, the hot air generator 20 includes a hot air generator 1, a blower 21 that supplies air to the supply port 15 </ b> B ₁ of the hot air generator 1, and an outlet 15 </ b> A of the hot air generator 1. ₁ to control the blower nozzle 22 for injecting hot air from ₁ onto the member to be dried, the internal pressure regulator 23 for adjusting the internal pressure in the heater chamber 5 of the hot air generator 1, and the blower 21 and the internal pressure regulator 23. Means 24.

Hot air generator pipe _{L 1} is the supply port 15B ₁ and the blower 21 of 1, hot air is generator 1 of air outlet 15A ₁ and the blasting nozzle 22 pipe _{L 2,} the terminal box 9A inlet 9A ₁ and the internal pressure adjusted vessel 23 and the pipe _{L 3,} the outlet port 9B ₁ and pressure regulator 23 of the terminal box 9B and compressor and piping _{L 4} and the internal pressure regulator 23 (purge gas supply device) are connected by a pipe _{L 5.} The hot air generator 1 and the internal pressure regulator 23 are connected by pipes L ₃ and L ₄ to form a purge gas circulation system.

  The control unit 24 includes control units 24A and 24B that control the blower 21 and the internal pressure regulator 23, and a temperature control unit 24C that controls the control unit by inputting the detection values of the temperature sensors 7a to 7c of the hot air generator 1. is doing. The control means 24 is connected to an operation switch SW and a power source. The control means 24 is actuated by a signal from the operation switch SW. In addition, although the heat exchanger is accommodated in the heat exchange chamber 12, it is abbreviate | omitted in FIG.

  Hereinafter, the operation of the hot air generator 20 will be described.

  When the operation switch SW is turned on, the blower 21 and the compressor are operated via the control means 24. By the operation of these devices, air is blown from the blower 21 to the heat exchange chamber 12 in the hot air generator 1, and a blower passage through which air is ejected from the blower nozzle 22 is formed. A compressed purge gas (air) is supplied from the compressor to the heater chamber 5 in the hot air generator 1 via the internal pressure regulator 23. The heater chamber 5 is maintained at an internal pressure higher than the atmospheric pressure by the purge gas circulation system. The lamp heater 3 in the heater chamber 5 is turned on by a signal from the temperature control unit 24C. As the lamp heater 3 is turned on, heat is stored in the heat exchanger 13 made of a heat storage member in the heat exchange chamber 12. When heat is stored in the heat storage member of the heat exchanger, the air passing through the heat exchange chamber 12 is heated and sent to the blowing nozzle 22, and the material to be dried is dried with warm air from the blowing nozzle.

According to this hot air generator 20, the purge gas flow path between the inlet and outlet of the heater chamber and the air flow path between the supply port and the outlet of the heat exchange chamber are partitioned, and the heater Since the internal pressure of the chamber is higher than the ambient pressure, this generator can be used safely even in hazardous locations where explosive gas vapor or flammable dust is present. Become. Also, since the flow of air flowing through the air flow path of the heat exchange chamber and the flow of purge gas flowing through the purge gas flow path of the heater chamber are in opposite directions, the purge gas returned to the internal pressure regulator during purge gas circulation Is cooled by the air flowing through the heat exchange chamber, the heat resistance of the internal pressure regulator can be reduced.
As a specific example, assuming that the lamp heater capacity is 4.8 kW, the blower 1.9 kW, and the compressor compressed air is 3.6 KPa, 10 L / min, hot air with a jet outlet temperature of 120 ° C. and a jet volume of 3 m ³ is ejected from the blow nozzle. it can. Further, this hot air generator has an explosion grade and an ignition degree of 2G2 (300 ° C. or lower). Further, when the lamp heater capacity is set to 7.2 KW, a hot air generator with a hot air temperature of 200 ° C. can be manufactured.

  The hot air generator 20 is used by ejecting hot air of a predetermined temperature, for example, 120 ° C., from the air blowing nozzle 22. However, when the air blower 21 stops during operation or during use, the hot air is stopped. The heater chamber 5 of the generator 1 may overheat and become dangerous. Therefore, the warm air generator 20 is provided with safety means. Hereinafter, this safety means will be described.

In this safety means, an alarm or power supply is shut off in the event of an abnormality by the control means 24 based on the detection values of the first and second temperature sensors 7a, 7b provided in the heater chamber 5. In this embodiment, when the length of the heat generating portion of the lamp heater 3 and 400 mm, the first temperature sensor 7a 200 mm from the feed port 15B _1, the second temperature sensor 7b is fixed to the position of 280mm from the supply port 15B _1, It detects the temperature in the center near the supply port and the temperature near the outlet. Since these detected values are located at positions where the first and second temperature sensors 7a and 7b are close to the supply port and the blowout port of the blower, in normal operation of the hot air generator 20, normally, ta <tb, and tb is approximately 120 ° C.

However, in the following states (a) and (b), the relationship ta <tb changes, and at the same time, the heater chamber is overheated, that is, overheated, and the abnormal temperature rises. That is,
(A) When the lamp heater is turned on when the blower is not operating (at the time of abnormality-1)
Even if the heat of the lamp heater 3 lit in the heater chamber 5 is transferred to the heat exchange chamber 12, the blower 21 is stopped, so that the heat in the heat exchange chamber 12 is not deprived and the heater chamber 5 is overheated. That is, it becomes an overheating state and rises to an abnormal temperature, for example, 170 ° C.
This abnormal temperature is detected by the first temperature sensor 7a, and an alarm or power supply is shut off by the control means 24. When the temperature in the overheated heater chamber 5 is detected by the temperature sensors 7a and 7b, even if the temperature rises abnormally, the relationship ta> tb is established from the purge gas flow.
(B) When the blower stops during normal operation (abnormal-2)
Similarly, when the blower stops during normal operation, the temperature at the location near the outlet in the heater chamber 5 rises abnormally. This abnormal temperature is detected by the second temperature sensor 7b, and an alarm or power supply is shut off by the control means 24. When the temperature in the overheated heater chamber 5 is detected by the temperature sensors 7a and 7b, even if the temperature rises abnormally, the relationship ta <tb is established from the purge gas flow.

  This hot air generator is suitable for applying paints, particularly water-based paints, to the parts to be repaired when repairing paint on automobile bodies, etc., and spraying hot air on the painted surface for drying. Is not limited to this and can be used for multipurpose purposes.

1 shows a hot air generator according to an embodiment of the present invention, FIG. 1A is a top view of the hot air generator, FIG. 1B is a side view of the hot air generator of FIG. 1A viewed from the IB direction, and FIG. It is the side view which looked at the 1A warm air generator from IC direction. 2A is a cross-sectional view taken along line IIA-IIA in FIG. 1B, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 1A. FIG. 3 is a top view showing a connected state of the heater chambers of the hot air generator of FIG. 1A. 4A is a cross-sectional view taken along the line IVA-IVA of FIG. 1A, and FIG. 4B is an enlarged cross-sectional view of the IVB portion of FIG. 4A. FIG. 5 is an exploded perspective view of the hot air generator of FIG. FIG. 6 is a plan view showing one end of the lamp heater of FIG. FIG. 7 shows a modification of the hot air generator of FIG. 1, which is formed by one heater unit. FIG. 7A is a top view and FIG. 7B is a side view. FIG. 8 shows another modification of the hot air generator of FIG. 1, and is a plan view of the hot air generator 1B in which a plurality of paired heater units are connected. FIG. 9 is a hot air generator and its control block diagram. FIG. 10 is an explanatory view for explaining safety means of the hot air generator.

1, 1A, 1B Hot air generator 2A, 2B Heater unit 3 Lamp heater 5 Heater chamber 6A, 6B Side plates 7a-7c Temperature sensors 9A, 9B Terminal box 9A ₁ Purge gas inlet 9B ₁ Purge gas outlet 12A, 12B Heat exchange chamber 13 Heat exchanger (heat storage member)
14 Cover body 15A, 15B Fixed box 15A ₁ Outlet 15B ₁ Supply port 17 Cover plate 18 Pipe 20 Hot air generator 21 Blower 22 Blower nozzle 23 Internal pressure regulator 24 Control means

Claims (9)

In a hot air generator that houses a heater in a case that is provided with a supply port and a blowout port and has a sealed periphery, and heats the gas supplied from the supply port with the heater and jets it from the blowout port.
The case is partitioned into a heater chamber and a heat exchange chamber that are sealed inside,
The heat exchange chamber accommodates a heat exchanger made of a heat storage member inside and communicates with the supply port and the outlet port,
The heater chamber is equipped with at least one lamp heater inside,
The heat exchanger made of the heat storage member is formed by forming a plurality of ventilation paths by forming a corrugated shape by folding a metal plate having a predetermined width and length into a small width in the length direction,
In the heater chamber and the heat exchange chamber, at least one heater unit in which one heater chamber and heat exchange chambers arranged on both sides of the heater chamber are set is accommodated in the case, and each heat of the heater unit is stored. The exchange chamber communicates with the supply port and the outlet port,
The case is composed of a fixed box provided with the supply port and a fixed box provided with the blowout port, and ends of the plurality of heater units are sealed and fixed by the pair of fixed boxes,
The hot air generator according to claim 1, wherein the supply port and the blowout port respectively formed in the pair of fixed boxes are provided on the side corresponding to the side walls of both the heat exchange chambers.   The hot air generator according to claim 1, wherein the heater chamber is filled with a nonflammable purge gas having a pressure higher than an ambient pressure.   The case contains a plurality of the heater units in the case, and each heater chamber of the heater unit is provided with a purge gas inlet and an outlet, respectively, and the inlet and outlet are used as a purge gas circulation system. The hot air generator according to claim 2, wherein the gas pressure is adjusted in each heater chamber by being connected.   Each heater chamber of the heater unit has an inlet of one heater chamber and an outlet of the other heater chamber connected by piping, and the inlet or outlet of one heater chamber located at the end. The hot air generator according to claim 3, wherein the other outlet or inlet is connected to a purge gas circulation system to adjust the gas pressure in each heater chamber.   The hot air generator according to any one of claims 1 to 4, wherein the heater chamber is coated with a heat-resistant infrared absorbing paint on an inner wall surface, and the lamp heater is a carbon lamp heater or a halogen lamp heater.   The heater chamber is provided with a first temperature sensor on an inner wall surface corresponding to or near the supply port side of the heat exchange chamber and a second temperature sensor on an inner wall surface corresponding to or near the outlet port side. The hot air generator according to any one of claims 1 to 5.   The hot air generator according to claim 1, wherein the case has an outer periphery covered with a heat insulating member.   The hot air generator according to any one of claims 1 to 7, a blower that blows air to an intake port of the hot air generator, a purge gas supply device that supplies a purge gas to the heater chamber, and the supply device And a control means for controlling the blower and the internal pressure regulator.   The hot air generator according to claim 6, a blower that blows air to an intake port of the hot air generator, a purge gas supply device that supplies purge gas to the heater chamber, and a heater connected to the supply device An internal pressure regulator for adjusting the gas pressure in the room, and a control means for controlling the blower and the internal pressure regulator, the control means when the detection value of the first or second temperature sensor exceeds a reference value A hot air generator characterized by stopping power supply to a heater or generating an alarm.

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