JP5583438B2 - Hot air dryer - Google Patents

Description

  The present invention relates to a hot air dryer, and more particularly to a hot air dryer that can be used safely in places where flammable or explosive gas is generated, for example, in a paint booth for painting an automobile body or the like. It is.

  For car body painting, etc., the undercoat is usually used for the purpose of preventing rust on the surface to be coated (sheet metal), the rust prevention effect of this undercoat and the intermediate coat for improving the finish of the next top coat and the appearance finish are good. The so-called three-coat three-bake method is employed, in which the coating process is performed at least three times for the top coating and the drying process for drying the coated surface between the three coating processes. Of these coating processes, oil-based paints excellent in smoothness, gloss, sharpness, weather resistance, and the like are often used for intermediate coating and top coating.

  Since this oil-based paint is diluted with an organic solvent and used, the organic solvent, for example, thinner evaporates (volatilizes) during the painting operation, and if the evaporated solvent is inhaled by the worker, it may cause health problems. is there. In addition, since the organic solvent is flammable, it needs to be handled with great care when used. On the other hand, the work place where the painting work is performed, for example, a painting booth, needs to have an explosion-proof structure. Therefore, the equipment for that purpose is generally expensive.

  Since oil-based paints have the above-mentioned problems, in recent years, water-based paints that are difficult to ignite and do not contain harmful components tend to be gradually used instead of oil-based paints. However, this water-based paint is diluted with water and used, and the organic solvent contained in the oil-based paint evaporates (volatilizes) in a few seconds, whereas the water contained in this water-based paint has a very slow evaporation rate. Evaporation usually takes a few minutes.

  This coating and drying treatment time can be shortened by increasing the drying temperature in the drying process. However, when this temperature is increased, evaporating components such as water are vaporized in the applied coating, The bubble-like film defect called “is easy to occur and causes poor coating. On the other hand, when the temperature is lowered, the occurrence of“ flakes ”is suppressed, but the drying time is prolonged. 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 that can set 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, three coats and three baking Since the method is adopted, improvement in coating quality and shortening of the coating time are major issues in painting work using water-based paint.

  Based on this situation, the applicant of the present application applies a paint, especially a water-based paint, to the repaired part of the car body, etc., and then blows it with hot air to dry it. Has developed a suitable hot air dryer and has applied for a patent with the name as a hot air generator. (See Patent Document 1 below).

  The structure of a part of the hot air generator disclosed in the following Patent Document 1 includes a heater, a heat storage member that stores heat from the heater, a container having an inlet into which gas flows in and an outlet through which gas flows out. The heat storage member is formed of a member having a plurality of ventilation paths, the heat storage member is housed in a housing case to form a heat storage body unit, and heat resistant infrared rays are formed on at least one outer wall surface of the housing case of the heat storage body unit. Absorbing paint is applied, and a heater is arranged on the wall surface to which this paint is applied, and is housed in a container.

JP 2008-309367 A (see paragraphs [0032] to [0039], FIG. 2)

  According to the hot air generator of the above-mentioned patent document 1, the problem of the conventional technique is solved, and even if a water-based paint is used, the painted surface can be finished and dried with good finish. This hot air generator is also used as a dryer that can be applied not only to drying paints, but also to a wide range of materials to be dried. It is coming.

  The main requirement is that it is desired to be small and light in weight, easy to carry and move, and to be easy to operate and low-priced with the expansion of usage. Further, in connection with this expansion of applications, it is desired that the above requirements be satisfied and that the flammable and explosive gases be generated safely.

  The inventors have developed a hot air dryer that satisfies these requirements, and have found that this type of hot air dryer also has the following improvements. One improvement is that when this type of hot air dryer is installed in the painting booth, mist and dust generated during painting in the painting booth will flow backward from the blowing hose and into the blowing hose and hot air generator. It adheres and accumulates, and the adhered and accumulated dust and mist are blown out during blowing and adhere to the painted surface. Another improvement is that explosive gases such as cleaning agents and paint coating organic solvents generated in the paint booth may flow backward from the blower hose and enter the heater section.

  This invention is made | formed in view of this condition, and the objective of this invention is improving the said point and providing the warm air dryer which can be used for a wide use.

  Another object of the present invention is to provide a warm air dryer in which the heater unit and the air blowing unit are unitized so that even if the heater unit is damaged due to some accident or the like, the damaged material is not mixed into the warm air. It is in.

In order to achieve the above object, a hot air dryer according to claim 1 is provided with a blower that sucks outside air and blows air, and a temperature that heats air sent from the blower and generates hot air of a predetermined temperature. In the hot air dryer in which the wind generator and the spraying means for spraying the hot air from the hot air generator to the object to be dried are connected by the air pipes having a predetermined length, respectively.
A backflow prevention valve is provided between the hot air generator and the blowing means to prevent the gas from flowing backward from the blowing means when the blowing from the blower is stopped .
Control means for adjusting the temperature and air volume of the hot air blown from the blowing means within a predetermined range, and the control means performs high speed operation and does not blow when the blowing means is sprayed with hot air It has a blower control unit that controls the blower to perform low-speed operation during heat storage,
At the time of the heat storage, a slight wind is jetted from the spraying means so that gas does not flow backward from the spraying means .

  The invention according to claim 2 is the hot air dryer according to claim 1, wherein the backflow prevention valve closes the valve port connected to the blower pipe connected to the hot air generator, and the valve port. Or a valve lid that is opened and a valve fixture that pivotally supports the valve lid so that the valve lid closes the valve port by its own weight. It is characterized by being pivotally supported.

  According to a third aspect of the present invention, in the hot air dryer according to the second aspect, the valve fixture is provided with a spring body having a biasing force that closes the valve lid to the valve port. It is characterized by.

  According to a fourth aspect of the present invention, in the hot air dryer according to the first aspect, the blow-out means is a drying nozzle having a blow-off port, and the back-flow prevention valve is provided in the drying nozzle. Features.

  According to a fifth aspect of the present invention, in the hot air dryer according to the first aspect, the blow-out means includes a dry nozzle having a blow-out port, and an operation switch for controlling the blower is provided in the dry nozzle. It is characterized by being.

  According to a sixth aspect of the present invention, in the hot air dryer according to the fifth aspect, the operation switch is an explosion-proof switch.

  According to a seventh aspect of the present invention, in the warm air dryer according to the first aspect, the blower and the warm air generator are controlled by a control panel that receives a signal from the operation switch, and the control panel is the blower. And a control board connected to the hot air generator, and an explosion-proof circuit for electrically insulating the control board from the operation switch.

The invention according to claim 8 is the hot air dryer according to claim 1 , wherein the control means sets the temperature of the hot air at a predetermined temperature higher than that during the low speed operation when the blower operates at a high speed. And a temperature control unit for controlling the hot air generator.

The invention according to claim 9 is the hot air dryer according to claim 1, wherein the hot air generator includes a heater unit in which a heater member is housed in a heater case and hermetically sealed, and around the heater case. And at least one heat exchange unit arranged in close contact, and the heat exchange unit is formed of a heat storage member having a ventilation path for storing heat from the heater member and allowing air supplied from the blower to pass through. It is characterized by being.

The invention according to claim 10 is the hot air dryer according to claim 9 , wherein the heater member is a lamp heater.

The invention according to claim 11 is the hot air dryer according to claim 9 , wherein the heat storage member is formed of a member having a plurality of ventilation paths.

The warm air dryer of the present invention has the following configuration, and thus has the following excellent effects. That is, according to the invention of claim 1, since the backflow prevention valve is provided between the hot air generator and the blowing means, the gas from the blowing means is stopped when the blowing from the blower is stopped. Can be prevented from flowing backward. When this hot air dryer is installed in a painting facility, for example, the internal pressure is increased from the outside inside the painting booth, but the hot air generator is inside the painting booth and the spraying means is outside the painting booth. Even when the blower is temporarily stopped after installation, mist or dust generated during painting in the painting booth does not flow backward and adhere to and accumulate on the hot air generator. As a result, it is possible to prevent a coating defect such as dust or mist adhering to the painted surface of the member to be coated. In addition, not only defective coating but also explosive gases such as cleaning agents generated in the booth and organic solvents in the paint are not likely to enter the heater of the hot air generator and ignite. In addition, mist and dust generated during painting in the painting booth flow backward and adhere to the hot air generator, etc., even during the standby time when drying is not performed, because a small wind is blown by the low-speed operation of the blower during heat storage. , No deposits. As a result, it is possible to prevent a coating defect such as dust or mist adhering to the painted surface of the member to be coated. In addition, not only defective coating but also explosive gases such as cleaning agents generated in the booth and organic solvents in the paint are not likely to enter the heater of the hot air generator and ignite.

  According to the invention of claim 2, since the valve lid closes or opens the valve port by its own weight, the check valve is easy to assemble with few parts and can be manufactured at low cost.

  According to the invention of claim 3, the valve lid can be reliably closed at the valve opening.

  According to the invention of claim 4, since the backflow prevention valve is provided in the drying nozzle, the backflow of gas can be prevented at a location close to the drying work place.

  Further, according to the invention of claim 5, since the operation switch for controlling the blower is provided in the drying nozzle, the blower can be controlled at a location close to the drying work place, and the workability is improved.

  According to the invention of claim 6, since the explosion-proof switch is used as the operation switch, it can be used even in an atmosphere where explosive gas is generated.

  According to the invention of claim 7, since the explosion-proof circuit and the control board are provided in the control panel, and the explosion-proof circuit and the control board are electrically insulated, the dryer main body installed in the non-hazardous area Even if an abnormality occurs on the control board side, abnormal voltage and abnormal current do not flow through the operation switch in the painting booth, which is the second type dangerous place.

Further, according to the invention of claim 8 , when the blower is switched from the low speed operation to the high speed operation, the strong wind of the outside air temperature is sent to the hot air generator and the temperature inside the hot air generator is reduced. By setting the preset temperature at a high time, a temperature drop due to strong wind is compensated, and stable hot air can be supplied.

According to the ninth aspect of the present invention, the heater unit and the heat exchange unit are isolated from each other, so that the air blown from the blower does not pass through the heat exchange unit and contact the heater in the heater unit. For this reason, it is possible to prevent unwanted materials adhering to the heater and the like from being mixed into the warm air.

According to the invention of claim 10 , since a lamp heater such as a carbon lamp heater or a halogen lamp heater is used as the heater member, the heat energy of the heating element can be directly transmitted to the heat storage body as radiant heat by infrared rays. The thermal response is much better on and off than using a heater that conducts heat by conduction, and accurate temperature control without overrun due to delay from the heat source is possible.

According to the invention of claim 11 , since the heat storage member is composed of a member having a plurality of ventilation paths, the heat storage member can be reduced in weight, and the heat from the lamp heater can be efficiently stored.

FIG. 1 is a schematic cross-sectional view of a facility in which a hot air dryer according to an embodiment of the present invention is installed in a painting facility. FIG. 2 is an external perspective view of the hot air dryer according to the embodiment of the present invention. FIG. 3 shows the dryer body of FIG. 2, FIG. 3A is a top view, and 3B is a side view. FIG. 4 is a side view of a state in which the side plate portion is removed from the dryer main body of FIG. 3B so that the inside can be seen. FIG. 5 is a top view in which the upper plate portion is removed from the dryer body of FIG. 3A so that the inside can be seen. 6 shows a hot air generator, FIG. 6A is a front view (state of FIG. 4), and FIG. 6B is a side view of the hot air generator of FIG. 6A. FIG. 7 is an exploded view of the hot air generator of FIG. FIG. 8 is an exploded view of one terminal box of FIG. FIG. 9 is an exploded view of the other terminal box of FIG. FIG. 10 is a cross-sectional view of the hot air generator of FIG. FIG. 11 is a side view showing one end of the lamp heater. 12A is a top view of the check valve, FIG. 12B is a side view of FIG. 12A, and FIG. 12C is a cross-sectional view taken along the line XIIC-XIIC in FIG. 12A. 13 is an exploded view of the check valve shown in FIG. FIG. 14 shows a drying nozzle, FIG. 14A is an external perspective view, and FIG. 14B is a top view. FIG. 15 is an exploded view taken along line XV-XV in FIG. 14B. FIG. 16 is a block diagram of control means for controlling the drying apparatus. FIG. 17 is a control chart of the control means of FIG. FIG. 18 is an explanatory diagram of the chart in which the portion A in FIG. 17 is enlarged.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a hot air dryer for embodying the technical idea of the present invention, and is not intended to specify the present invention as this hot air dryer. Other embodiments within the scope of the claims are equally applicable. In this embodiment, an example in which it is installed in a painting facility such as an automobile body will be described. However, the application is not limited to such a painting facility, and it can be installed and used in various general drying equipment for drying objects. It is.

Embodiment
First, with reference to FIG. 1, the usage example of the warm air dryer which concerns on embodiment of this invention is demonstrated. FIG. 1 is a schematic cross-sectional view of a facility in which a hot air dryer according to an embodiment of the present invention is installed in a painting facility.

  The coating equipment 1 is configured such that, for example, a hot air dryer 10 according to an embodiment of the present invention is installed in a coating booth 2 that can accommodate a member to be coated such as an automobile and can perform a painting operation. The painting booth 2 is surrounded by a floor surface 2a having a relatively large area, a side wall surface 2b erected at a predetermined height from the periphery of the floor surface, and a ceiling surface 2c covering an upper portion of each side wall surface. , And a relatively large room having a space 3 of a predetermined size inside. A part of the side wall surface is provided with an openable / closable door (not shown) capable of carrying in and out a material to be coated, such as an automobile, and allowing an operator to go in and out. The painting booth 2 has a structure in which the interior of the room is sealed when the door is closed. The ceiling surface 2c has an opening of a predetermined size, and a filter F2 is attached to the opening. Further, the floor surface 2a is dug down to a predetermined depth to form a slot 7A having a predetermined size, and a lattice plate 7B provided with a plurality of slits in the opening of the slot 7A is mounted.

The painting booth 2 is provided with a fresh air supply device 4 for supplying fresh air into the room and an exhaust device 6 for discharging gas, dust and the like generated during the painting operation to the outside.
The fresh air supply device 4 includes a boiler 5A that raises the temperature of outside air to a predetermined temperature, a blower 5B that blows the heated air, and a blower duct 5D provided on the ceiling surface 2c. The blower 5B and the blower duct 5D are connected by a blower pipe 5C. The exhaust device 6 includes a slot 7A below the floor and a blower 7C that is connected to the slot and sucks air in the painting booth 2 or the like. Symbols F1 and F3 represent filters.

  The painting equipment 1 is supplied with fresh air adjusted to a coating atmosphere optimum for coating a material to be coated into the painting booth 2 from the fresh air supply device 4, that is, a predetermined temperature / humidity and atmospheric pressure. In the painting booth 2, a predetermined painting operation is performed, and gas, dust, and the like generated in the painting operation are discharged from the floor surface to the exhaust device 6. The coating booth 2 is set by the control means of the fresh air supply device 4 so that the internal pressure is slightly higher than the external pressure. Due to the increase in the internal pressure, the outside air does not directly enter the painting booth 2, and the inside of the booth is maintained in a desired painting atmosphere.

  As shown in FIG. 1, the hot air dryer 10 includes a dryer main body 11 that generates hot air disposed outside the coating booth 2 and a drying nozzle 57 disposed therein. Are connected by a bendable blower hose 67 having a predetermined length. The blower hose 67 is provided in a state of penetrating the side wall surface 2 b of the painting booth 2. The drying nozzle 57 is used by being detachably hooked on a movable stand 68 (see FIG. 2) having a predetermined height.

  The hot air dryer 10 has a dryer body 11 placed outside the painting booth 2, blows warm air of a predetermined temperature to the drying nozzle 57 in the painting booth, and a predetermined amount of hot air from the drying nozzle 57. Is sprayed onto the material to be dried.

  However, the hot air dryer 10 may be temporarily stopped or stopped for a relatively long time, that is, a so-called pause during use in the procedure of the coating process. When there is such a temporary stop, the blower from the blower is stopped. On the other hand, since the internal pressure in the painting booth 2 is higher than the outside air, the air in the painting booth 2 is blown from the drying nozzle 57 to the blowing hose. A reverse flow phenomenon that enters the dryer main body 11 through 67 occurs. When such a backflow phenomenon occurs, mist or dust generated during painting in the painting booth 2 flows back through the blower hose 67 and adheres to and accumulates in the blower hose 67 or the dryer main body 11. Sometimes. When the pause or the like is completed, the operation of the hot air dryer 10 is resumed. However, when the blower is activated along with the resumption of the operation, the dust or deposits accumulated in the dryer main body 11 or the blower hose 67 are removed. Mist is blown into the painting booth 2. For this reason, the dust and mist blown out adheres to the painted surface of the member to be coated. As a result, the finish of the coating is deteriorated, which may result in poor coating. In addition, when such a reverse flow phenomenon occurs, explosive gases such as cleaning agents generated in the painting booth 2 as well as organic solvents in the coating paint enter the heater in the dryer body 11 as well as poor painting. There is a risk of fire. Such a reverse flow phenomenon may occur not only when the hot air dryer 10 is temporarily stopped or paused, but also when it is left for a long time while it is stopped or paused for a long time or installed in the facility.

  Therefore, the warm air dryer 10 is a valve that prevents the occurrence of a back flow phenomenon when it is temporarily stopped or stopped in the vicinity of the hot air blowing port of the dryer body 11, that is, the back flow prevention valve 48 (FIG. 4). Reference) is provided. Also, this hot air dryer has other features, which will be explained in the following description.

  Hereinafter, with reference to FIGS. 2-5, the warm air dryer 10 which concerns on embodiment of this invention is demonstrated. 2 is an external perspective view of a hot air dryer according to an embodiment of the present invention, FIG. 3 shows the dryer body of FIG. 2, FIG. 3A is a top view, 3B is a side view, and FIG. 4 is the dryer of FIG. FIG. 5 is a side view showing a state in which the inside is visible by removing the side plate from the machine body, and FIG. 5 is a top view in which the inside is visible by removing the top board from the dryer body of FIG. 3B.

  As shown in FIG. 2, the hot air dryer 10 has a dryer main body 11 that generates hot air at a predetermined temperature, and a blower hose 67 is connected to the dryer main body to spray hot air on an object to be dried. A drying nozzle 57 for drying is used, and this drying nozzle is detachably hooked on a movable stand 68 having a predetermined height and is used. In this embodiment, a drying machine main body and a drying nozzle are connected using a long air blow hose, and the drying object is dried at a location away from the drying machine main body, depending on the type of the drying object. Does not necessarily require a long blower hose, but shortens or eliminates the blower hose and, in addition to drying nozzles, uses other spraying means to dry the object to be dried. Can do. Therefore, in this hot air dryer, the drying nozzle is not necessarily essential, and depending on the type of drying object or the way of drying, only the dryer main body can be used, so this dryer main body is called a hot air dryer. Sometimes. In the claims, this dryer body is expressed as a hot air dryer.

  As shown in FIGS. 4 and 5, the dryer main body 11 includes a box-shaped housing 12 having a space S of a predetermined size inside, an outside air intake port and a hot air blowing port outside, and the interior of the housing. In addition, a filter device 17 for removing unnecessary substances contained in the outside air, a blower 18A for sucking the outside air, an inverter 18B for controlling the blower, and the air sent from the blower are heated to a predetermined temperature to reach a predetermined temperature. A hot air generator 20 for generating wind, a control board 19 for controlling a dryer, a control panel provided with an explosion-proof circuit, and the like are accommodated, and a filter device 17 having one end of an air blower 18A having an intake port 17a and the other end are provided. The hot air generator 20 and the other end of the hot air generator 20 are connected to the hot air blowing port 12b1 by a blowing tube of a predetermined length. A backflow prevention valve 48 is provided between the hot air generator 20 and the hot air blowing port 12b1. In addition, an operation switch is attached to the drying nozzle 57, and the blower in the dryer body is controlled by the operation switch. As the operation switch, an explosion-proof switch is used. This switch is connected to an explosion-proof circuit in the control panel by a control line, and a signal is sent to the control board 19 electrically insulated via the explosion-proof circuit. Although not shown, this control line is arranged along the blower hose 67. Hereinafter, the individual component structures constituting the dryer main body will be described in detail.

  As shown in FIGS. 2 to 5, the housing 12 includes a rectangular bottom plate portion 12a having a predetermined length L1 and a width length L2, and side plate portions 12b that are erected at a predetermined height H1 from the periphery of the bottom plate portion 12a. 12e and a ceiling plate portion 12f that closes the top of each of the side plate portions 12b to 12e, and is formed of a rectangular parallelepiped box having a space S of a predetermined size inside. The housing 12 is manufactured by preparing a frame assembly using a plurality of frame frames in advance and mounting the bottom plate portion 12a, the side plate portions 12b to 12e, and the ceiling plate portion 12f to the frame assembly. A plurality of casters 13 are provided on the bottom plate portion 12a. This caster facilitates the movement of the dryer body.

  In addition, among the plurality of side plate portions 12b to 12e, a plurality of slits 14 through which outside air is sucked are formed on substantially the entire surface of the one side plate portion 12e. By providing a plurality of slits 14 on substantially the entire surface of the side plate portion 12e, a large amount of outside air is sucked from substantially the entire surface of the side plate portion, and a blower, an inverter, a hot air generator, etc. housed in the housing are provided. While the device is air-cooled, the air is sucked from the air inlet 17a of the filter device 17 in the vicinity of the substantially central portion inside. As a result, the device accommodated in the housing is efficiently cooled with air, and the outer wall surface of the housing 12 is not excessively heated, so that even if an operator touches it, there is no burn. Further, the side plate portion 12e is provided with a filter covering the plurality of slits 14 on the inner side thereof, thereby preventing unwanted materials from entering the inside. The side plate portion 12b is provided with a hot air blowing port 12b1 and a hose connecting portion that surrounds the blowing port and to which the blowing hose 67 is connected. A connection cover 16 is detachably attached to the hose connection portion. By covering the hose connection part with the connection cover 16, it is possible to prevent a hand or the like from directly touching the hose connection part. Further, a power switch 11A is provided on the side plate portion 12c. The size of the housing 12 is, for example, a length L1 of 695 mm, a width length L2 of 410 mm, and a height H1 of 900 mm.

  The filter device 17 includes a connecting portion having a communication hole in the bottom, a cylindrical container having an opening in the upper portion and a hollow inside, and a lid that covers the upper opening, and a filter is accommodated therein. It is configured. The cylindrical container is provided with an air inlet 17a on its side. The internal filter is interchangeable. In addition, since the air blower 18A and the inverter 18B use a well-known thing, those description is abbreviate | omitted.

  The control panel is provided with an explosion-proof circuit and a control board. A known explosion-proof circuit is used, and is connected to an explosion-proof operation switch provided on the drying nozzle 57 by a control line. When this operation switch is turned on, the photodiode emits light in the explosion-proof circuit in the control panel connected by the control line, and when this light is received by the photocoupler connected to the control board, a signal is sent to the control board. And the blower is controlled. The explosion-proof circuit and the control board are electrically insulated, and even if an abnormality occurs on the control board side in the dryer body installed in a non-hazardous area, No abnormal voltage or current flows through the operation switch.

  The hot air generator will be described with reference to FIGS. 6, 7 and 10. 6 shows a hot air generator, FIG. 6A is a front view (state of FIG. 4), FIG. 6B is a side view of the hot air generator of FIG. 6A viewed from the side, and FIG. FIG. 10 is a sectional view of the hot air generator of FIG.

  As shown in FIGS. 6 and 7, the hot air generator 20 has first and second terminal boxes 33 and 37 attached to both ends of a heater case 29 in which a heater is housed. Heat exchange units 30A and 30B for storing the heat of the heater on the plane and heating the blown air are brazed. In the gaps G1 and G2 between the heat exchange units 30A and 30B and the first and second terminal boxes 33 and 37, the first connection box 24 having a supply port to which air blown from the blower is supplied and the temperature A second connection box 26 having an outlet from which wind is blown is provided, and the heat exchange units 30A and 30B and the second connection box 26 are covered with a cylindrical case 21. A heat insulating material (not shown) is wound between the cylindrical case 21, the heat exchange units 30 </ b> A and 30 </ b> B, and the second connection box 26.

  The hot air generator 20 has a length L3 in the longitudinal direction and a length L5 in a direction orthogonal to this direction. The length between the first and second connection boxes is L4, and the width of the terminal box is L6. For example, L3 is 730 mm, L4 is 500 mm, L5 is 220 mm, and L6 is 125 mm.

As shown in FIG. 7, the cylindrical case 21 covers a long frame case 22 whose one side surface in the longitudinal direction is opened and bent in a substantially U shape, and an open portion of the frame case. The case cover 23 is made of a metal material such as a steel plate. The frame case 22 has a pair of opposing plate-like portions 22a and 22b and a connecting portion 22c that connects one side edge of these plate-like portions, and the other end of the pair of plate-like portions 22a and 22b. The edge part is open | released and it is comprised by what the plate body which has predetermined | prescribed thickness bent in the substantially U shape. On one of the plate-like portion 22a, the through hole 22 ₁ of a predetermined size to penetrate the plate-like portion is formed. This through hole is an installation location of the thermal fuse 46. A fuse box 45 is attached to the through hole portion. The case cover 23 is formed of a plate having a size that covers the opening of the frame case 22. The case cover 23 is provided with a cover body 23a into which a small box 26a of the second connection box 26 is inserted at one end.

The first connection box 24 includes a small box 24a of the through-hole 24 ₁ and the other end of connecting pipe 25 is coupled is open on one side has a space of a predetermined size therein, the opening of the small box It has a pair of plate-like pieces 24b and 24c which are opposed to each other and extend forward by a predetermined length. The pair of plate-like pieces 24b and 24c are connected to the end portions of the first terminal box 33 and the heat exchange unit assembly. It is formed of a metal plate material with a gap for closing. The connection pipe 25 is coupled by welding to the outer opening of the through hole 24 _1. The second connection box 26 has substantially the same configuration as the first connection box 24. That is, the second connecting box 26 has a space of a predetermined size therein, one side through holes 26 ₁ a connection pipe is coupled is provided, and a small box 26a whose other end is open, The small box has a pair of opposing plate-like pieces 26b and 26c extending a predetermined length forward from the opening of the small box, and the pair of plate-like pieces 26b and 26c includes the second terminal box 37 and the heat exchange unit. A gap for closing the end portion of the assembly is formed and is formed of a metal plate. The outer opening of the through hole 26 ₁ connecting pipe 27 is coupled by welding or the like.

A heater and a heat exchange unit are demonstrated with reference to FIG.7, FIG.10, FIG.11. 10 is a cross-sectional view of the hot air generator of FIG. 6, and FIG. 11 is a side view of the end of the lamp heater.
As shown in FIG. 10, the heater unit 28 </ b> A is a flat heater having a plurality of, for example, three long heaters 28, and a space that is large enough to dispose these heaters at predetermined intervals. The three long heaters 28 are fixed by first and second terminal boxes 33 and 37 attached to both ends of the heater case 29.

A carbon lamp heater is used for each of the three long heaters 28. The carbon lamp heater, as shown in FIG. 11, the heating resistor of the strip-like having a predetermined width dimension and a length (carbon fiber, i.e., carbon) 28 _1, the terminal portions connected to both ends of the resistor 28 ₃ and has, this resistor is transparent heat-resistant member, covered with a transparent quartz tube 28 _2, has a structure in which internal inert gas is filled. The terminal portion 28 ₃ are connected lead wires 28a is adapted to be 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 to the heat exchanger as radiant heat, and has much better on-off thermal response than using a heater that conducts heat by heat conduction, and the heat conduction from the heat source. Accurate temperature control without overrun due to delay becomes possible. The lamp heater is not limited to a carbon lamp heater, and may be a halogen lamp heater (hereinafter, these are collectively referred to as a lamp heater). Further, the number of lamp heaters is not limited to three, and may be any number, for example, two or four or more.

  The heater case 29 has a space in which three lamp heaters 28 can be arranged in a single plane at a predetermined interval, and is formed from a flat cylindrical case of a size that can cover and accommodate these lamp heaters 28. And is formed of a metal plate material having high thermal conductivity.

  Three lamp heaters 28 are arranged in the heater case 29 at a predetermined interval, and both end portions of each lamp heater 28 are first and second attached to both end portions of the heater case 29. The heater unit 28A is assembled by being fixed by the terminal boxes 33, 37. The lamp heater 28 in the assembled heater unit 28A is isolated from heat exchange units 30A and 30B described later, that is, the blown air does not directly contact the lamp heater 28.

The heater unit 28A is provided with first and second heat exchange units 30A and 30B on the wide side wall surface of the flat heater case 29, that is, the upper and lower side wall surfaces in the state shown in FIG. These heat exchange units are formed so that the length in the longitudinal direction is slightly shorter than that of the heater case 29, and are assembled such that predetermined gaps G1 and G2 are left between the terminal boxes 33 and 37 during assembly. These gaps are passing portions through which air or warm air passes. On one of the gaps G2 portion, each heat exchange unit 30A of the air from the connection box 24 during assembly, wind deflecting plate 30C to substantially uniformly distributed to each of the heat exchanger 32 ₂ of 30B (see FIG. 7) is provided. The wind direction deflecting plate 30C is formed of a plate-like body that deflects the wind direction in a predetermined direction. If this is not provided a wind direction deflection plate 30C, the blast volume in front and the back of the heat storage fins constituting the heat exchanger 32 ₂ is changed, while many locations of the air flow heat exchange is good, little portion of airflow heat The exchange is bad, the temperature becomes high, and the overall thermal efficiency becomes poor. In addition, when heat exchange deteriorates, the temperature inside the heater rises and the life of the lamp heater and the entire heater unit may be shortened. However, this problem can be solved by providing the wind direction deflecting plate 30C. Since the first and second heat exchange units 30A and 30B have the same configuration, the configuration of one heat exchange unit 30A will be described.

  As shown in FIG. 10A, the heat exchange unit 30A has a configuration in which two heat exchangers are accommodated in a unit case 31 having a predetermined size.

The unit case 31 is a square-shaped case having substantially the same width as the wide side wall surface of the heater case 29 and having one open side surface, and the length in the longitudinal direction is shorter than that of the heater case 29. The unit case 31 is provided with two heat exchangers 32 ₁ and 32 ₂ in the longitudinal direction, and has a substantially U-shaped relatively long bowl shape covering a side surface in the longitudinal direction, It is made of aluminum or an aluminum alloy. The unit case 31 has two heat exchangers 32 ₁ and 32 ₂ arranged and accommodated in a straight line, and the air blown from one end is heated to a predetermined temperature by these heat exchangers. It is designed to blow out from the other end. Since these heat exchangers 32 ₁ and 32 ₂ have the same configuration, the configuration of one of the heat exchangers will be described.

Heat exchanger 32 ₁ is corrugated heat storage member, that is, composed of a heat storage fins. This heat storage fin uses a metal plate material having a predetermined plate thickness and length, and is folded into a bellows shape so that the metal plate material 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.

  In the heat exchange unit 30A, two heat exchangers having the same configuration are accommodated in the unit case 31 and disposed on the wide side wall surface of the heater case 29. Therefore, the heat exchange unit 30A has a temperature generated by the heat exchange unit 30A. Wind does not enter the heater case 29 and come into contact with the lamp heater 28. Hot air from the other heat exchange unit 30 </ b> B does not enter the heater case 29. According to this configuration, the air sent from the blower is heated through the heat exchange units 30A and 30B without passing through the heater case 29, so that the lamp heater 28 in the heater case 29 has some sort of Even if it is damaged in an accident, it is possible to prevent damage from being mixed into the hot air. In addition, since each of the heat exchange units 30A and 30B has a heat storage action, even when the dryer is temporarily stopped or suspended, it is possible to blow desired hot air in a timely manner without time lag when the operation is resumed. In one heat exchange unit 30 </ b> A, a thermal fuse 46 is brought into contact with the outer surface of the unit case 31 at a location close to the first terminal box 33. When the thermal fuse 46 is brought into contact with the contact portion 30a (see FIG. 7), the abnormal overheating temperature can be detected accurately. Each heat exchange unit 30A, 30B is provided with two heat exchangers, but is not limited to this number and may be three or more. Further, the number of heat exchange units may be more than two units. In this case, a heater unit will be added. Since the heater and the heat exchange unit do not use heavy objects, the size and weight can be reduced.

  The first and second terminal boxes will be described with reference to FIGS. FIG. 8 is an exploded view of the first terminal box, and FIG. 9 is an exploded view of the second terminal box.

As shown in FIGS. 7 and 8, the first terminal box 33 includes a connection box 34 in which a terminal member is housed and coupled to the heater unit 28 </ b> A, and a terminal member that supplies power to the lamp heater 28. Has been. The connection box 34 has a main body 34a having a relatively large opening at one end and an inside having a cavity 34c, and a projecting cylindrical body 34b that protrudes outward from the side wall surface of the main body and has a through hole in the inside. It is formed of a molded body obtained by processing a metal plate material having low thermal conductivity, for example, a plate material such as iron or stainless steel (SUS). The reason why a material having low thermal conductivity is used is that the heat conduction from the heater case 29 increases, so that the temperature of the junction box 34 rises, leading to a temperature rise of the terminal member. The through hole of the protruding cylindrical body 34b communicates with the space of the main body portion 34a. One end of the heater case 29 of the heater unit 28A is inserted into and fixed to the through hole of the protruding cylindrical body 34b (see FIG. 10). The main body portion 34a has a through hole through which a power supply line is inserted on one side surface of the outer periphery. The main body 34a accommodates a terminal block 35a made of an insulator to which a heater lead wire is connected, a heater terminal fitting 35b, a heater fixing member 35c for fixing the heater terminal fitting 35b, and a thermistor fixing member 35d. Incidentally, the heater terminal fitting 35b is mounted to secure the quartz glass tube end 28 ₂ to the left and right advance lamp heater 28. The opening of the main body 34a is sealed with a terminal cover 36B with a seal packing 36A interposed between the terminal block 35a and the heater fixing member 35c.

As shown in FIGS. 7 and 9, the second terminal box 37 includes a connection box 38 in which a terminal member is housed and coupled to the heater unit 28A, and a heater terminal and a thermal fuse connection terminal member. ing. The connection box 38 has a main body portion 38a having a relatively large opening at one end and an inside having a cavity 38c, and a protruding cylindrical body 38b that protrudes outward from the side wall surface of the main body portion and has a through hole inside. The first terminal box 33 is made of the same material. The through hole of the protruding cylindrical body 38b communicates with the space of the main body portion 38a. One end of the heater case 29 of the heater unit 28A is inserted and fixed in the through hole of the protruding cylinder 38b (see FIG. 10). The body portion 38a has a through-hole 38 ₁ is perforated to the end of the conduit 44 on one side of the outer periphery is inserted. The wiring tube 44 is fixed to the through hole using a fixing tool. A wiring connected to the temperature fuse is inserted into the wiring tube 44. A heater fixing member 39 and a terminal block 40 are accommodated in the main body portion 38a. After the heater fixing member 39 and the terminal block 40 are accommodated, the opening of the main body 38 a is sealed with the terminal cover 43 with the seal packing 42 interposed therebetween.

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

  First, the heater unit 28A and the pair of heat exchange units 30A and 30B are combined and integrated. This integration is performed by fixing the pair of first and second heat exchange units 30 </ b> A and 30 </ b> B to the heater case 29. This fixing is performed by placing the first and second heat exchange units 30A and 30B on the wide side wall surface of the flat heater case 29 of the heater unit 28A and brazing with aluminum. At this time, as shown in FIG. 10A, the first and second heat exchanging units 30A and 30B have gaps G1 and G2 that serve as passing portions through which air or warm air passes between the terminal boxes 33 and 37. Arrange them so that they are open.

Next, the first terminal box 33 and the second terminal box 37 are fixed to one end of the heater case 29. Thereafter, the gaps G1 and G2 between the terminal boxes 33 and 37 are covered with the respective plate-like pieces of the first and second connection boxes 24 and 26, and the plate-like pieces are respectively attached to the fixtures 47a and 47b. The connection boxes 24 and 26 are fixed to the terminal boxes 33 and 37 by combining them. At that time, a wind direction deflecting plate 30C is provided on the gap G2, that is, the side covered with the connection box 24, and air from the connection box 24 is sent to each heat exchanger 30A, 30B heat exchange unit 30A, 30B. 32 substantially uniformly so as to distribute to _2.

  Thereafter, a gap between the heater unit 28A and the first and second heat exchange units 30A and 30B, and a gap fitting portion between the terminal boxes 33 and 37 and the first and second connection boxes 24 and 26 and the fixtures 47a and 47b. In order to prevent air from leaking out, heat-resistant silicone adhesive is applied to each gap and gap fitting portion and sealed. Next, the three lamp heaters 28 are inserted from the second terminal box 37, and one end of each lamp heater is fixed in the second terminal box 37. Further, the thermal fuse wiring is led out from the second terminal box 37, inserted into the wiring tube 44, and connected to the thermal fuse 46 in the fuse box 45.

  Next, the other end of each lamp heater 28 is fixed in the first terminal box 33. Inside the second terminal box 37, the terminal portion of each lamp heater 28 and the thermal fuse connection terminal are connected to the terminal member, and the terminal cover 43 is screwed and sealed in the opening via the seal packing 42. . The other first terminal box 33 also has a terminal member connected to the power supply line, a thermistor wiring terminal connected to the thermistor connection cable 41, and a seal packing 36A. The terminal cover 36B is screwed to the opening of the lever to complete the assembly of the heater unit. Each terminal box 33, 37 has a terminal cover that can be removed. Thereby, by removing the terminal cover, connection work, connection change, and the like can be easily performed.

Thereafter, a glass wool heat insulating material (not shown) is wound around the assembly, inserted into the frame case 22, and covered with a case cover 23. The temperature fuse 46 is mounted in the through hole 22 ₁ of the plate-like portion 22a of the frame case 22, a fuse box 45 for screwed into the through-hole portion. This completes the assembly of the hot air generator.

  In the assembled hot air generator 20, electric power is supplied from the first terminal box 33 to each lamp heater 28 of the heater unit 28A, and the heat exchangers in the first and second heat exchange units are heated and stored. The On the other hand, air is blown from the first connection box 24, and the blown air passes through the respective heat exchangers in each heat exchange unit and is heated to a predetermined temperature. 26. At this time, since the heater unit 28 </ b> A and the heat exchange unit are not communicated with each other, the blown air passes through the heater case 29. That is, the blown air does not touch the lamp heater 28 directly. Therefore, even if the lamp heater is damaged due to some accident, the damaged material is not mixed into the hot air. Further, when the temperature fuse 46 is blown, power supply to the lamp heater 28 is stopped, and overheating can be prevented. Since the thermal fuse 46 is provided on the first terminal box 33 side, overheating can be detected accurately.

  The backflow prevention valve will be described with reference to FIGS. 12A is a top view of the check valve, FIG. 12B is a side view of FIG. 12A, FIG. 12C is a sectional view taken along line XIIC-XIIC in FIG. 12A, and FIG. 13 is an exploded view of the check valve in FIG. .

  The backflow prevention valve 48 is configured such that a valve member is housed in a valve box 49 formed of a box having a predetermined size and is closed by a lid 52. The valve box 49 has a substantially rectangular bottom plate portion 49a having a predetermined area and side plate portions 49b to 49e erected at a predetermined height from the bottom plate portion, and has an opening 49f at the top of the side plate portion. It consists of a box and is made of a metal plate. An edge frame 51a is attached in advance to the periphery of the opening 49f by welding, and this edge frame 51a becomes a seal surface of a seal packing 51b described later.

The valve box 49 is provided with a stepped portion 50 therein, and is sized to open or close the valve body 55, that is, to close or open the valve opening. The step portion 50 is formed of a side plate portion in which a side plate portion 49d erected from the bottom plate portion 49a extends outward from the middle at a right angle and is connected to an upper opening 49f. A valve fixture 56 is attached to the step portion 50. Side plate portion 49d has a substantially circular through-hole 49 ₁ in the lower step portion 50 is formed, connecting pipe 53 to the outside of the side plate portion communicates with the through hole is fixed. Of the through hole 49 _1, a substantially circular opening in the valve box 49 has a valve port. Also the side plate portion 49d opposed to the side plate portion 49e, the side plate portion through hole 49 ₂ penetrating is formed a connecting tube 54 surrounding the through-hole 49 ₂ is coupled.

The valve member is, as shown in FIG. 13, a valve body 55 for closing the valve port 49 _1, and a valve fixture 56 pivotally supporting the valve body, to the valve fixture 56, the valve member 55 A shaft rod 56a pivotally supported and a spring body 56b that urges the valve opening with a valve body are provided. Valve body 55 includes a valve cover 55a sized to close the valve port 49 _1, and the pivot portion 55b, which is rotatably pivoted to the shaft rod 56a of the valve fastener provided extends from the valve cover And is made of a metal plate material.

In assembling the backflow prevention valve 48, first, the connecting pipes 53 and 54 are fixed to the respective through-hole portions of the valve box 49. On the other hand, the valve body 55 is rotatably attached to the shaft rod 56 a of the valve fixture 56, and the valve fixture 56 is fixed to the step portion 50 in the valve box 49. This fixed, valve cover 55a of the valve body 55 is hanging along the inner wall surface of the side plate portion 49d, a state of closing the valve port 49 _1. This condition, the weight of the valve body 55, i.e., closes the valve port 49 ₁ by its own weight. Further, the valve fixture 56, since the spring body 56b is are installed, the valve port 49 ₁ is closed more reliably by the biasing force of the spring member 56b. After the valve body 55 is accommodated in the valve box 49, the edge frame 51a is covered with the lid body 52 with the seal packing 51b interposed therebetween, and the assembly is completed. Assembled check valve 48, the warm air is blown from one of the connecting tube 53, by the wind of the hot air, is rotated in a direction in which the valve cover 55a of the valve body to open the valve port 49 _1, The air is blown to the other connecting pipe 54 side. At this time, the open state where the warm air is blown is continued in the valve body 55. When the blowing ceases, valve cover 55a is valve port 49 ₁ returns to the original state is closed by its own weight. Even if such as compressed air from the other connecting pipe 54 is blown, never valve port 49 _first valve body 55 is actuated to open.

  According to the backflow prevention valve 48, the valve opening of the valve body is open during the period when the warm air is blown, but the valve opening is closed when the blowing stops, so that the backflow phenomenon does not occur. . That is, even if a hot air generator is installed in the painting booth 2 or the like, mist or dust generated during painting flows back through the blower hose 67 and adheres and accumulates in the blower hose 67 or the dryer main body 11. There is nothing to do.

  The drying nozzle will be described with reference to FIGS. 14 shows a drying nozzle, FIG. 14A is an external perspective view, FIG. 14B is a top view, and FIG. 15 is an exploded view taken along line XV-XV in FIG. 14B.

  The drying nozzle 57 has a nozzle blowing portion 58 having a hot air blowing port in the front and a nozzle handle portion 59 in the rear, and the nozzle blowing portion 58 and the nozzle handle portion 59 are detachable by a connecting member 66. And a pistol type in which an operation switch is incorporated in the nozzle handle portion 59. The nozzle blowing portion 58 can be rotated 90 degrees to either the left or right so as to be orthogonal to the longitudinal direction of the nozzle handle portion 59 in a coupled state. The nozzle blowing part 58 and the nozzle handle part 59 are respectively provided with hook rings 61 and 64 having a predetermined size. The hook ring 61 of the nozzle blowing part 58 has a high temperature when the hot air dryer is used. Therefore, the nozzle blowing part 58 is used when working with both hands or when the nozzle blowing part 58 is rotated. Used as a handle. Further, the hook ring 61 can be hooked on the hook portion of the movable stand 68. The hook ring 64 of the nozzle handle portion 59 is provided for hooking on the hook portion of the movable stand 68, but it is also used as a handle for the drying nozzle 57. The nozzle blowing part 58 and the nozzle handle part 59 are each constituted by an assembly of a half housing. In the following description, these two nozzle blowing portions and nozzle handle portions are referred to as half-nozzle blowing portions 58A and 58B and half-nozzle handle portions 59A and 59B.

As shown in FIG. 15, one half-nozzle outlet 58A includes a semi-connecting portion 60a made of a semi-hollow tube, and a substantially triangular bottom plate portion 60b extending forward from the semi-connecting portion in a fan shape. The side plate portions 60c and 60d are erected at a predetermined height from the inclined side of the bottom plate portion, and the end sides 60e of the side plate portions 60c and 60d are formed to serve as outlets. The semi-connecting portion 60a has a shaft hole 60a1 in which a pivot shaft 66a of a connecting member 66, which will be described later, is pivoted, and a locking claw hole 60a2 for fitting a locking claw 66b of the connecting member. It is provided facing two places. The bottom plate portion 60b, protrusion 60 ₁ are erected wind direction changing member 62 is mounted. A first half hook ring 61a is formed on the outside of each side plate portion 60c, 60d. The other half-nozzle outlet 58B has the same configuration as the half-nozzle outlet 58A.

One nozzle handle 59A includes a semi-hollow tube 63a connected to the semi-connecting portion 60a, a second half hook ring 64a and a half gripping portion 65a provided on the outer periphery of the semi-hollow tube 63a. The trigger portion 65a ′ is provided in the half gripping portion, and the operation switch 65 is accommodated in the trigger portion 65a ′. Half hollow tube 63a, one end portion 63 ₁ is in the connecting portion the half coupling portion 60a, the other end portion 63 ₂ is connected to the blowing hose 67. At one end 63 _1, locking grooves 63a 'is provided which is held down by the locking claw 66b of the connecting member 66 when it is connected to the nozzle outlet 58. The locking grooves 63a ′ are provided at two locations facing the outer periphery of the nozzle handle portion 59, and the left and right sides of the nozzle blowing portion 58 are perpendicular to the longitudinal direction of the semi-hollow tube 63a of the nozzle handle portion 59. It can be rotated 90 degrees to either. The other nozzle handle 59B has the same configuration as the nozzle handle 59A.

  The wind direction changing member 62 has a mounting plate portion 62a and a pair of opposing wind direction plate portions 62b and 62c on both side edges of the mounting plate portion, and disperses the warm air blown substantially uniformly from the blowing portion. It is a function to inject. The operation switch 65 is an explosion-proof switch. By using an explosion-proof switch as the operation switch 65, the drying nozzle can be used in an atmosphere where explosive gas is generated.

  The connecting member 66 is a swing piece, and has a pivot shaft 66a at the center, a locking claw 66b for pressing the locking groove 63a 'of the nozzle handle 59 on the nozzle handle 59 side, and a spring 66c inside. And the connection member 66 of the nozzle blowing part 58 is provided in the outer peripheral part by the side of the half connection part 60a so that two upper and lower sides may be opposed. The connecting member 66 is urged by a spring 66c, and the locking claw 66b is pushed into the locking groove 63a ′ of the nozzle handle 59 through the locking claw hole 60a2 of the semi-connecting portion 60a. And the nozzle handle 59 are fixed. This locking groove 63a ′ is provided so that the nozzle blowing portion 58 can be rotated 90 degrees to either the left or right so that it is orthogonal to the longitudinal direction of the semi-hollow tube 63a of the nozzle handle portion 59. The blowing part 58 can be rotated without being removed from the nozzle handle part 59. When removing the nozzle blowing part 58 from the nozzle handle part 59, the one end of each connecting member 66 on the outlet side is pressed to release the locking claw 66b from the locking groove 63a '. The blowing part 58 can be pulled out.

  The drying nozzle 57 is assembled by assembling the nozzle outlet 58 and the nozzle handle 59 individually. That is, in assembling the nozzle blowing portion 58, the wind direction changing member 62 is arranged in one half nozzle blowing portion 58A, and then the pivot shaft 66a of the connecting member 66 in which the spring 66c is housed is used as the axis of the half connecting portion 60a. It inserts in the hole 60a1, and combines and couple | bonds so that it may pinch | interpose with the other half nozzle blowing part 58B. In this state, the connecting member 66 is biased by the spring 66c, and the locking claw 66b is in the locking claw hole 60a2.

  The nozzle handle 59 is assembled by placing the operation switch 65 in one half-nozzle handle 59A and combining it with the other half-nozzle handle 59B.

Thereafter, when the end of the blowing mouth side of each connecting member 66 is pressed, the locking claw 66b is recessed from the inner surface of Kakaritometsumeana 60A2, the nozzle outlet portion 58 at one end 63 ₁ of the nozzle handle portion 59 Then, each of the connecting members 66 is returned, and the locking groove 63a ′ is pressed by the locking claw 66b by the urging force of the spring 66c, so that the nozzle blowing portion 58 and the nozzle handle portion 59 are coupled.

  According to this drying nozzle, since it is constituted by the assembly of the half-split housing, the mold can be easily created and can be easily and inexpensively assembled. In addition, the operation switch allows the blower to be controlled in a place close to the drying operation, so that the drying operation can be performed efficiently. In this embodiment, the backflow prevention valve is provided on the dryer main body side, but this position may be changed and provided on the drying nozzle. The backflow prevention valve in this place is preferably a manual or electric type.

  With reference to FIGS. 16-18, the control method of a drying apparatus is demonstrated. 16 is a block diagram of the control means for controlling the drying apparatus, FIG. 17 is a control chart of the control means of FIG. 16, and FIG. 18 is an explanatory chart of an enlarged chart of portion A of FIG.

  The control means 70 includes a blower control unit 71 that controls the blower 18 </ b> A and a temperature control unit 72 that controls the temperature of the lamp heater 28 in the hot air generator 20. This control means 70 is connected to a power source via the power switch 11A, and sends a control signal to each device by a signal from the operation switch 65.

  Below, the control method of the warm air dryer 10 using this control means 70 is demonstrated. First, when the power switch 11A is turned on at a time point t1 after a predetermined time from the rest time point t0, predetermined power is supplied from a power source (not shown) to the lamp heater 28 and the blower 18A in the hot air generator 20. By this power supply, the motor of the blower 18A rotates at a low speed (480 rpm), and at the same time, the power supply to the lamp heater 28 is controlled by the temperature controller 72, and the inside of the hot air generator 20 rises to the set temperatures T1 and T2, respectively. Be warmed. That is, the inside of the hot air generator 20 is heated to the set temperature T1, and the outlet is heated to the set temperature T2. A predetermined amount of heat is stored in the heat exchange units 30A and 30B. The heat storage in the heat exchange units 30A and 30B and the low-speed operation of the blower are continued from the time point t1 to the time point t2, and during this time, hot air heated to a predetermined temperature is injected from the nozzle blowing unit 58. Since the blower is operated at a low speed, the warm air is a breeze having a low wind pressure. When the operation switch 65 is turned on in the next process by setting the temperature of the hot air generator 20 to the set temperature T1, T2 by supplying power from the power supply when the power switch 11A is turned on, The hot air generator operates quickly.

  When the operation switch 65 is turned on at a time point t2 after a predetermined time from the time point t1, the blower is switched to a high speed operation of 7200 rpm, and at the same time, the supply power to the lamp heater 28 is increased by the temperature control unit 72, and hot air is generated. The inside of the vessel 20 is changed to 170 ° C., which is the set temperature T1, and the outlet is changed to 210 ° C., which is the set temperature T2. The change of the set temperatures T1 and T2 is such that the blower is switched from the low speed operation (480 rpm) to the high speed operation (7200 rpm), and the strong air of the outside air temperature is sent to the hot air generator 20, and the temperature inside the hot air generator 20 is changed. This is to reduce the decrease. That is, when the blower 18A is switched from the low speed operation (480 rpm) to the high speed operation (7200 rpm), the strong air of the outside air temperature is sent to the hot air generator 20, and the temperature in the hot air generator 20 is changed to the dotted line Tb in FIG. As shown in Therefore, the set temperatures T1 and T2 of the hot air generator 20 are increased by a predetermined temperature, for example, 10 ° C., and the heater power P corresponding to the temperature increase is supplied. That is, when approximately 100% of the heater power P is supplied to the lamp heater 28 at time t1, a predetermined amount of heat is stored in the heat exchange units 30A and 30B due to the heat generated by the lamp heater 28, and the hot air generator 20 The temperature rises from the outside air temperature (for example, 25 ° C.) to the set temperature T2. After a predetermined amount of heat is accumulated in the heat exchange units 30A and 30B, even if the heater power P is reduced from 100% to 30%, it does not fall from the set temperature.

  When the blower is switched to high speed operation in this state, the heat exchange units 30A and 30B are cooled by the strong wind, and the temperature in the hot air generator 20 is lowered as shown by the dotted line in FIG. However, since the temperature control unit 72 sets the set temperatures T1 and T2 to be 10 ° C. higher and increases the heater power P, even if the temperature in the hot air generator 20 decreases due to the high speed operation of the blower, The decrease immediately returns in a short time, and stable hot air of approximately 200 ° C. is blown from the outlet as shown by a solid line Ta in FIG. If the set temperature is not increased, as shown by the dotted line Tb in FIG. 18, the temperature drop in the hot air generator is large and the recovery is delayed, so that stable hot air cannot be supplied. Returning to FIG. 17, when the operation switch 65 is turned off at time t3, the blower 18A is switched from the high speed operation to the low speed operation, and the temperature in the hot air generator 20 returns to approximately 200 ° C., and at this temperature. The heat exchange units 30A and 30B are stored with heat.

  Thereafter, when the operation switch 65 is turned on again at time t4, the blower 18A is switched from the low speed operation to the high speed operation, and the hot air generator 20 is set to a high temperature so that the temperature drop due to the strong wind is compensated. The hot air of a predetermined temperature is ejected from the nozzle blowing part 58. In this way, by blowing a breeze during heat storage, mist, dust, etc. generated during painting inside the painting booth will flow backward and adhere to the hot air generator etc. even during the standby time when drying is not performed. There is nothing wrong. As a result, it is possible to prevent a coating defect such as dust or mist adhering to the painted surface of the member to be coated. Further, not only poor coating but also the possibility of explosive gas such as cleaning agent generated in the booth and organic solvent of coating paint invading into the heater part of the hot air generator and igniting can be eliminated.

  The hot air blown from the outlet of the hot air generator 20 is sent to the nozzle blowing portion 58 through a hose having a predetermined length, and a strong wind having a predetermined temperature is jetted from the nozzle blowing portion 58. Thereafter, the same cycle, that is, heat storage for a predetermined time in the heat exchange units 30A and 30B and injection of warm air from the nozzle blowing unit 58 are repeated alternately. When this cycle is repeated and the power switch 11A is turned off at the time t8 when the drying operation is completed, the power supply to the heat exchange units 30A and 30B is stopped. At this time, it is preferable to cool the heat storage body etc. by delaying the stop of the blower 18A for a predetermined time.

  According to this control method, heat storage and spraying for a predetermined time are alternately repeated, and hot air at a predetermined temperature can be sprayed from the nozzle blowing portion 58, so that the heat exchange units 30A and 30B are coated during heat storage. For example, water-based paint is applied to the surface, and then the operation switch 65 of the hand switch attached to the nozzle handle 59 is turned on for a predetermined time, so that the paint can be dried with hot air sprayed from the nozzle blowing part 58. it can. Since the operation switch 65 is fixed to the nozzle handle portion 59, by operating the operation switch 65, the blower 18A and the lamp heater 28 can be controlled to inject hot air at a predetermined temperature.

  This hot air generator can have the following effects by having the above-described configuration.

  First, since the backflow prevention valve is provided between the hot air generator and the blowing means, it is possible to prevent the gas from the blowing means from flowing backward when the air blown from the blower is stopped. When this hot air blower is installed in a painting facility, for example, the internal pressure inside the painting booth is increased from the outside, the hot air generator is installed inside the painting booth and the spraying means is installed outside, and the blower is temporarily stopped. However, mist or dust generated during painting in the painting booth does not flow back and adhere to and accumulate on the hot air generator. As a result, it is possible to prevent a coating defect such as dust or mist adhering to the painted surface of the member to be coated. In addition, not only defective coating but also explosive gases such as cleaning agents generated in the booth and organic solvents in the paint are not likely to enter the heater of the hot air generator and ignite.

  Further, since the valve opening is closed or opened by the weight of the valve lid, the check valve can be easily assembled with a small number of parts and can be manufactured at low cost.

  Furthermore, since the operation switch for controlling the blower is provided on the drying nozzle, the blower can be controlled at a location close to the drying work place, and workability is improved. Since the explosion-proof switch is used as the operation switch, it can be used even in an atmosphere where explosive gas is generated. In addition, by providing a backflow prevention valve in the drying nozzle, it is possible to prevent the backflow of gas at a location close to the drying work place.

  Furthermore, since the explosion-proof circuit and the control board are provided in the control panel, and the explosion-proof circuit and the control board are electrically insulated, there is an abnormality on the control board side in the dryer body installed in the non-hazardous area. Even if it occurs, abnormal voltage and abnormal current do not flow through the operation switch in the painting booth, which is the second type dangerous place.

  Furthermore, the heater unit and the heat exchange unit are isolated, and the air blown from the blower does not pass through the heat exchange unit and contact the heater in the heater unit. For this reason, it is possible to prevent unnecessary substances from adhering to the heater and the like from being mixed into the hot air.

  Furthermore, by making the heat storage member into a corrugated fin, the contact area with the air can be expanded, the heat exchange rate can be improved, 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 or the like with aluminum or an aluminum alloy, the heat storage member is lightweight and has an excellent heat storage effect.

  Furthermore, since a carbon lamp heater or halogen lamp heater is used for 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 transfers heat by heat conduction. The on / off thermal response is good, 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 addition, mist and dust generated during painting inside the painting booth flow back to the warm air generator during the standby time when drying is not performed due to the low wind speed of the blower being injected during heat storage. There will be no adhesion or deposition. As a result, it is possible to prevent a coating defect such as dust or mist adhering to the painted surface of the member to be coated. In addition, not only defective coating but also explosive gases such as cleaning agents generated in the booth and organic solvents in the paint are not likely to enter the heater of the hot air generator and ignite.

DESCRIPTION OF SYMBOLS 1 Coating equipment 2 Coating booth 4 Fresh air supply apparatus 6 Exhaust apparatus 10 Hot air dryer 11 Dryer main body 12 Housing 17 Filter apparatus 18A Blower 20 Hot air generator 24, 26 Connection box 28A Heater unit 28 Lamp heater 29 Heater case 30A , 30B Heat exchange unit 30C Airflow direction deflector 33, 37 Terminal box 48 Backflow prevention valve 57 Drying nozzle 58 Nozzle outlet 59 Nozzle handle 62 Airflow direction change member 66 Connecting member 67 Blower hose 68 Stand 70 Control means 71 Blower controller 72 Temperature Control unit

Claims (11)

A blower that draws in outside air and blows air, a hot air generator that heats the air sent from the blower to generate hot air at a predetermined temperature, and blows hot air from the hot air generator to an object to be dried. In the hot air dryer in which the spraying means to be attached are connected by the air pipes of a predetermined length,
A backflow prevention valve is provided between the hot air generator and the blowing means to prevent the gas from flowing backward from the blowing means when the blowing from the blower is stopped .
Control means for adjusting the temperature and air volume of the hot air blown from the blowing means within a predetermined range, and the control means performs high speed operation and does not blow when the blowing means is sprayed with hot air It has a blower control unit that controls the blower to perform low-speed operation during heat storage,
At the time of the heat storage , the warm air drying device is characterized in that a fine wind is jetted from the spraying means so that gas does not flow backward from the spraying means .   The check valve includes a valve port communicating with a blower pipe connected to the hot air generator, a valve lid that closes or opens the valve port, and a valve fixture that pivotally supports the valve lid. The hot air dryer according to claim 1, wherein the valve lid is pivotally supported by the valve fixture so as to close the valve port by its own weight.   The hot air dryer according to claim 2, wherein the valve fixture is provided with a spring body having a biasing force that closes the valve lid to the valve port.   The hot air dryer according to claim 1, wherein the blow-out means includes a drying nozzle having a blow-out port, and the back-flow prevention valve is provided in the drying nozzle.   The hot air dryer according to claim 1, wherein the blowing means includes a drying nozzle having a blowing port, and an operation switch for controlling the blower is provided in the drying nozzle.   The hot air dryer according to claim 5, wherein the operation switch is an explosion-proof switch.   The blower and the hot air generator are controlled by a control panel that receives a signal from the operation switch. The control panel is connected to the blower and the hot air generator, and the control board is connected to the operation switch. The hot air dryer according to claim 5, further comprising an explosion-proof circuit for electrical insulation with the air dryer. The said control means has a temperature control part which sets the temperature of the said warm air to predetermined temperature high temperature from the time of the said low-speed driving | operation at the time of high-speed driving | operation of the said blower, and controls the said hot-air generator. 1. The hot air drying apparatus according to 1.   The warm air generator has a heater unit in which a heater member is accommodated in a heater case and hermetically sealed, and at least one heat exchange unit closely disposed around the heater case, the heat exchange unit comprising: The hot air dryer according to claim 1, wherein the hot air dryer has a ventilation path for storing heat from the heater member and passing air supplied from the blower. The hot air dryer according to claim 9 , wherein the heater member is a lamp heater. The hot air dryer according to claim 9 , wherein the heat storage member is formed of a member having a plurality of ventilation paths.

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