JP2012198004A - Hot air generating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable hot air generating apparatus that can generate and blast stable hot air of a predetermined constant temperature without using a heater that is likely to induce ignition.SOLUTION: A hot air generating apparatus includes a motor 15, a root blower 17, a heat accumulator 22, a switching valve 27, a feedback blower tube Lthat links one discharge valve opening 27a side of the switching valve with the suction side of the root blower to return the compressed air discharged from the heat accumulator to the root blower, and a control device 39 that controls the motor 15 and the like. After making the motor rotate to operate the root blower and taking outer air into the root blower to compress it, the control device 39 makes the compressed air return to the root blower via the heat accumulator, the switching valve, and feedback blower tube L. After making the compressed air circulate once or more in a circulation forced draft air duct going through the same root blower 17 and heat accumulator 22 again, the control device blows hot air outside from a blower tube 35.

Description

  The present invention relates to a hot air generator, and more specifically, without using a heater that easily induces ignition, such as a sheathed heater or a carbon heater, without using a heater, instead using a roots blower (Roots Blower), The present invention relates to a hot air generator capable of blowing hot air at a predetermined temperature after once storing and adjusting the heat from the roots blower.

  When drying automobile bodies, etc., nichrome wire heaters, sheathed heaters, carbon heaters, etc. are used as the heat source, and gas (air) is blown directly or indirectly from the fan blower to these heat sources to generate hot air at a specified temperature. Thus, hot air generators have been developed that spray this hot air on a painted surface and the like to dry it. For example, Patent Document 1 below describes a gas heater that uses a carbon heater as a heat source and blows gas (air) from a blower to the carbon heater to generate hot air at a predetermined temperature.

  With reference to FIG. 11 and FIG. 12, the gas heater described in this patent document 1 is demonstrated. 11 is an external perspective view of the gas heater described in Patent Document 1, FIG. 12 shows a heat exchanger constituting the gas heater of FIG. 11, FIG. 12A is an exploded perspective view, and FIG. It is sectional drawing cut | disconnected in the direction orthogonal to a direction. The gas heater 40 includes a heater 41 and a pair of heat exchangers 42. The heater 41 uses a belt-like carbonaceous heating element as a heating element. The heater 41 is accommodated in a heater pipe 45, and heat is exchanged between the flat surface of the heating element of the heater and the outer surfaces of a pair of opposing surfaces. The heat exchanger 42 includes a frame 42a and corrugated fins 43 provided inside the frame 42a. Further, a gas supply unit 47 is provided at one end of the heat exchanger 42 in the length direction, and a heating gas discharge unit 48 is provided at the other end.

  When the gas heater 40 is energized to the heater 41, the corrugated fins 43 of the heat exchanger 42 are heated by the heat generated by the heater. When gas is supplied to the heat exchanger 42 from the intake port 47 a of the gas supply unit 47, the heat exchanged heated gas is discharged from the discharge port 48 a of the heated gas discharge unit 48.

  According to the gas heater 40, the heater pipe 45 is provided with the supply / exhaust ports 46a and 46b of pressurized gas, which is different from the gas passing through the heat exchanger 42, so that the internal pressure of the heater pipe 45 is increased. The gas containing the volatile component can be used in a state, and there is no fear that the heater 41 is in direct contact. Moreover, since the heat exchanger 42 is along the length direction of the heater 41, and the one end part in the length direction is a gas supply part, and the other end part is a heating gas discharge part, Since the gas that moves is subjected to a heat exchanging action over the entire length of the heat exchanger 42, it has features such as being able to blow uniform hot air with high thermal efficiency.

  Patent Document 2 below also discloses a hot air generator using a carbon heater. The hot air generator includes a heater, a heat storage member that stores heat from the heater, and a container that has an inlet and an outlet through which gas flows in, and the heat storage member includes a plurality of ventilation paths. The heat storage member is housed in a housing case to form a heat storage body unit. In addition, a heat-resistant infrared absorbing paint is applied to at least one side outer wall surface of the storage case of the heat storage unit, and a heater is placed on the wall surface to which the paint is applied and stored in a container. According to this hot air generator, since a plurality of heat storage unit units are stacked and accommodated in a multi-stage with a heater interposed therebetween, a hot air generator having a large heat storage capacity can be obtained. .

JP 2009-2640 (paragraphs [0013] and [0018], FIG. 1) JP 2008-309367 A (paragraphs [0035] to [0036], FIGS. 1 and 2)

  According to the gas heater and the hot air generator disclosed in Patent Documents 1 and 2, it is possible to dry the object to be dried by blowing hot air at a predetermined temperature. However, these heaters and the like use a carbon heater as a heat source, and blow a gas (air) from a fan blower to the carbon heater to generate hot air of a predetermined temperature and blow this hot air on an object to be dried. Therefore, it was found that the following problems are latent from these device configurations.

  One problem is that a carbon heater is used as a heat source. If the heater breaks down or breaks, for example, a heater pipe breaks, the heat source may be exposed and flammable materials may be ignited. For example, when such a damage occurs when a volatile paint is dried, a safety problem becomes obvious. Another problem is that since a fan blower is used for blowing air, it is difficult to adjust the wind pressure, in particular, it is difficult to increase the wind pressure, and it is also difficult to increase the air volume. If the air volume and wind pressure are low and weak, the length of the air duct that blows hot air is limited and cannot be extended long.As a result, the gas heater is moved closer to the object to be dried, You will have to work in close proximity to the material to be dried. Therefore, if the material to be dried generates volatile gas, it becomes easy to induce ignition, and as a result, the risk increases. In order to increase the air volume and pressure, it is possible to use a large fan blower and a large capacity heater. However, this increases the size and cost of the equipment and increases the power consumption, thus saving energy. Cannot be realized.

  The gas heaters and hot air generators of Patent Documents 1 and 2 are all related to the invention of the present inventor. However, since these gas heaters have such problems, The inventors do not use a heater that easily induces ignition and a fan blower that has a problem in air flow / wind pressure, so that it is not heater-like, and has a desired air flow / air pressure and hot air at a predetermined temperature. It was investigated by repeating trial and error whether or not it was possible to generate air.

  In this exploration process, if a roots blower classified as a rotary blower is used instead of a heater that easily triggers ignition, this roots blower has high durability that can withstand high-speed rotation, and is small and lightweight. Pay attention to the fact that compressed air with the desired air flow / wind pressure is discharged, and that the compressed air is heated and heated by frictional heat generated during air compression during operation. When the Roots blower is operated at high speed, the temperature rise of the compressed air is further increased, and when the compressed air whose temperature has been raised is returned to the Roots blower and recompressed in the Roots blower, The present invention is completed by conceiving that when the temperature further rises and this feedback is repeated, the temperature further rises and hot air at a desired temperature can be generated. And it has reached.

  Therefore, the present invention was made based on the solution of the problems of the prior art and the above idea, and the object of the present invention is to make a heater-less without using a heater that easily triggers ignition, and to achieve a predetermined An object of the present invention is to provide a hot air generator with high safety that can generate and blow a stable hot air at a constant temperature.

  Another object of the present invention is to provide a hot air generator capable of increasing the length of a blower pipe that blows hot air having a desired wind pressure and air volume and blows the hot air from a hot air generator to a material to be dried.

  Another object of the present invention is to provide a warm air generator capable of adjusting the amount of air to be blown.

  Still another object of the present invention is to provide a hot air generator capable of blowing stable hot air by once storing and adjusting the temperature of the heat from the hot air generating unit and then blowing it to the air blowing pipe.

  Still another object of the present invention is to provide a hot air generator that can mute and blow noise when storing noise generated from a hot air generator.

  Still another object of the present invention is to provide a hot air generator having the above-mentioned object, which is small, lightweight, energy saving and inexpensive.

In order to solve the above problems, a hot air generator according to a first aspect of the present invention includes a motor that rotates at a predetermined rotational speed, a roots blower that is connected to the motor, sucks in outside air, compresses it, and discharges it. A regenerator that passes through the compressed air discharged from the Roots blower and stores the heat of the compressed air, and is connected to the discharge side of the regenerator and switches the compressed air discharged from the regenerator to a different direction for blowing. A switching valve having at least two discharge valve ports, and a feedback for returning the compressed air discharged from the heat accumulator to the roots blower by connecting one discharge valve port side of the switching valve and the intake side of the roots blower. A blower pipe, a blower pipe connected to the other discharge valve port side of the switching valve and blowing compressed air discharged from the heat accumulator to the outside, and a motor for controlling the motor And a control unit for controlling the motor comprises a control means,
The control device rotates the motor by the motor control means to operate the Roots blower, sucks outside air into the Roots blower and compresses the compressed air, and then compresses the compressed air to the heat accumulator, the switching valve, and the return air blower. Returning to the Roots blower via a pipe, and circulating the circulation air passage that passes through the same Roots blower and the heat accumulator at least once more, then hot air is blown from the blow pipe to the outside. Hot air generator.

  The hot air generator of the second aspect is the hot air generator of the first aspect, wherein the roots blower is any one of a two-leaf root blower, a three-leaf root blower, a vane blower, and a multistage turbo blower. To do.

  The hot air generator of the third aspect is the hot air generator of the first or second aspect, wherein the motor and the roots blower are connected by an electromagnetic clutch, and the electromagnetic clutch is provided in the control device. It is characterized by being operated by a clutch control means.

  The hot air generator of the fourth aspect is the hot air generator of any one of the first to third aspects, wherein the roots blower is provided with a muffler filter on at least one of the inlet and outlet sides. It is characterized by being.

  Further, the hot air generator of the fifth aspect is the hot air generator of the first aspect, wherein the heat accumulator is provided with a temperature sensor, and the control device receives the output from the temperature sensor, The heat storage is controlled to be stored at a predetermined constant temperature.

  The hot air generator of the sixth aspect is the hot air generator of the first or fifth aspect, wherein the heat accumulator has a heat storage member having a plurality of ventilation paths at one end and a gas exhaust port at the other end. It is characterized by being housed in a sealed case having an outlet.

  Further, the hot air generator of the seventh aspect is the hot air generator of the sixth aspect, wherein the heat accumulator has a sound deadening filter housed in the sealed case.

  Further, the hot air generator of the eighth aspect is the hot air generator of the seventh aspect, wherein the heat storage member is formed on a corrugated member provided with irregularities of a predetermined depth and height alternately, A plurality of slits for allowing a part of hot air to pass therethrough are provided on the uneven wall surface.

  Further, the hot air generator of the ninth aspect is the hot air generator of the eighth aspect, wherein the plurality of slits are divided into a plurality of regions having a predetermined area on the uneven wall surface. It is characterized by alternately different ventilation paths.

  Further, the hot air generator of the tenth aspect is the hot air generator of the first aspect, wherein the switching valve is provided with a valve opening / closing mechanism, and the air flow rate to the blower pipe is adjusted by the valve opening / closing mechanism. It is characterized by doing.

  The eleventh aspect of the hot air generator is the hot air generator of the first aspect, wherein a long hose is connected to the blower pipe, and a blowing nozzle is attached to the tip of the hose. An air switch is attached to the spray nozzle, and hot air is controlled by an air signal from the air switch.

  The hot air generator of the twelfth aspect is characterized in that, in the hot air generator of the eleventh aspect, an air pipe for transmitting an air signal from the air switch is incorporated in the blower pipe.

  According to the hot air generator of the first aspect of the present invention, using a roots blower, heat from the roots blower can be stored once in a heat accumulator and a stable hot air can be blown. That is, it is possible to provide a so-called heaterless hot air generator that does not use a heater such as a sheathed heater or a carbon heater that easily triggers ignition. Moreover, since a roots blower is used, it can be made into hot air with increased air volume and increased wind pressure compared to a hot air generator that blows air with a conventional fan blower. As a result, it is intended to provide a hot air generator that can blow hot air having a desired wind pressure and air volume and increase the length of a blower pipe that blows the hot air from the hot air generator to the object to be dried.

  According to the hot air generating device of the second aspect of the present invention, desired hot air can be generated by selecting and using various roots blowers according to the characteristics of each roots blower.

  According to the hot air generator of the third aspect of the present invention, the electromagnetic clutch can easily connect and disconnect the motor and the Roots blower, and the temperature control in the Roots blower can also be simplified.

  According to the hot air generator of the fourth aspect of the present invention, the Roots blower is operated at high speed, and high noise is generated by this high speed operation. However, the noise can be reduced by providing a silencer at the intake port.

  According to the hot air generator of the fifth aspect of the present invention, the hot air can be blown with the temperature of the hot air substantially constant and stable. Further, overheating of the regenerator, that is, overheating can be prevented, and damage can be prevented.

  According to the hot air generator of the sixth aspect of the present invention, the heat raised by the Roots blower can be efficiently stored.

  According to the hot air generator of the seventh aspect of the present invention, the heat accumulator can mute while reducing the noise from the Roots blower by providing the sound deadening filter in the sealed case.

  According to the hot air generator of the eighth aspect of the present invention, heat from the hot air can be efficiently stored in the heat storage member, and noise from the Roots blower can be reduced and silenced.

  According to the hot air generator of the ninth aspect of the present invention, the hot air meanders and passes through the heat storage member, so that heat can be efficiently stored and noise from the Roots blower can be reduced and silenced.

  According to the hot air generator of the tenth aspect of the present invention, when the switching valve is provided with a valve opening / closing mechanism, and the opening degree of the discharge valve port of the switching valve is set by this valve opening / closing mechanism, A desired air volume can be blown.

  According to the hot air generator of the eleventh aspect of the present invention, by attaching an air switch to the spray nozzle, an atmosphere in which no volatile gas or the like is generated is generated by ON / OFF of the air switch as in an electrical switch. Even in this case, it can be used safely.

  According to the hot air generator of the twelfth aspect of the present invention, the air pipe management is made safe by incorporating the air pipe that transmits the air signal from the air switch into the blower pipe.

FIG. 1 is an external perspective view of a hot air generator according to an embodiment of the present invention. FIG. 2 is a system block diagram showing an arrangement of devices constituting the hot air generator of FIG. 1 and connected by piping or the like. FIG. 3 is a cross-sectional view for explaining the operation of the Roots blower constituting the hot air generator of FIG. FIG. 4 is a characteristic diagram of the Roots blower of FIG. FIG. 5 is a temperature change diagram of hot air blown from the hot air generator of FIG. 6 shows a heat accumulator, FIG. 6A is an external perspective view, and FIG. 6B is an exploded perspective view. 7 shows the heat accumulator of FIG. 6, FIG. 7A is a sectional view taken along line VIIA-VIIA in FIG. 6A, FIG. 7B is a sectional view taken along line VIIB-VIIB in FIG. 6A, and FIG. It is sectional drawing. 8A is an exploded view of a heat storage member constituting the heat storage device of FIG. 6, and FIG. 8B is a cross-sectional view taken along line VIIIB-VIIIB of FIG. 9 shows the heat storage member of FIG. 8, FIG. 9A is a plan view of the heat storage member extended, FIG. 9B is a side view of the heat storage member stored in the storage case, FIG. 9C is a top view from above, and FIG. It is a perspective view explaining the state which passes. FIG. 10 is a perspective view of a switching valve provided with an opening / closing mechanism. FIG. 11 is an external perspective view of a conventional gas heater. 12 shows a heat exchanger constituting the gas heater of FIG. 11, FIG. 12A is an exploded perspective view, and FIG. 12B is a cross-sectional view cut in a direction orthogonal to the longitudinal direction.

  Hereinafter, embodiments 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 is not intended to specify the present invention, and is not limited to the scope of the claims. It is equally applicable to those of other embodiments included in.

[Embodiment]
With reference to FIG. 1, FIG. 2, the hot-air generator which concerns on embodiment of this invention is demonstrated. FIG. 1 is an external perspective view of a hot air generator according to an embodiment of the present invention, and FIG. 2 is a system block diagram in which the equipment constituting the hot air generator of FIG.

  A hot air generator 10 according to an embodiment of the present invention accommodates devices such as the motor 15, roots blower 17, and heat accumulator 22 shown in FIG. 2 in a box-shaped case 12 having a predetermined size shown in FIG. The apparatus main body 11 which produces | generates hot air with the apparatus of this, and discharges it outside is led out from this apparatus main body 11 with a comparatively long ventilation pipe (hose) 35, and sprayed on the front-end | tip of this ventilation pipe A nozzle 36 is mounted, and a predetermined amount of hot air is blown from the nozzle opening 36b to an object to be dried or the like by operating an operation handle 36a provided on the blowing nozzle 36. Further, a power cable (not shown) is led out from the apparatus main body 11, and the power cable is connected to a power source so that power is supplied from the outside to an internal device via the power cable. . Furthermore, a supply pipe (not shown) to which compressed air is supplied from a compressor (not shown) installed in the factory is connected to the apparatus body 11.

Box-type case 12, as shown in FIG. 1, and the floor plate portion 12a made of a substantially rectangular metal plate substrate having a predetermined width A ₁ and the vertical width A _2, predetermined height H from the outer periphery of the floor plate portion A space of a predetermined size is formed inside by enclosing the standing side plate portions 12b to 12e and a ceiling plate portion 12f covering the upper opening of the side plate portion. The dimensions of the lateral width A ₁ , the width A ₂ and the height H are, for example, A ₁ and A ₂ are 450 mm and H is 800 mm. The floor plate portion 12a is formed of a metal plate base material that is relatively thick and has high mechanical strength, and the motor 15, the roots blower 17, the heat accumulator 22, and the like are supported and fixed on the metal plate base material. A plurality of casters 13 are attached to the back surface of the floor plate portion 12a. By attaching these casters 13, the apparatus main body 11 can be easily moved. In addition, the height of the caster 13 is 120 mm, for example. Of the side plate portions 12b to 12e that surround the four sides, the one side plate portion 12e is formed with a through hole that passes through the side plate portion, and an outside air filter 14 that draws in outside air is attached to the opening of the through hole. ing. This outside air filter 14 uses a nonwoven fabric etc., for example. Other side plate portion 12c, to form the tube insertion holes 12c _1, relatively long air blowing tube (hose) 35 is derived. Furthermore, the ceiling plate section 12f is divided into the front of the inclined surface 12f ₂ behind the and the flat surface 12f _1, the operation panel 11a is attached to the inclined surface 12f _2. The operation panel 11a is provided with a power switch, a motor drive switch, clutch switching means, and the like.

  The blower pipe 35 is a relatively long hose, and a spray nozzle 36 is attached to the tip. An air switch 37 is attached to the spray nozzle 36. The air switch 37 and the control device 39 are connected by an air pipe 35b. That is, the air pipe 35b includes two hollow pipes. Via these hollow pipes, compressed air is filled from the outside, and the switch signal is transmitted to the control device by operating the air switch 37. . The air pipe 35b may be provided on a different route from the blower pipe, but it is preferable to use one integrated with the blower pipe. When integrated, the blower pipe 35 is constituted by a pipe hose 35a for blowing hot air and an air pipe 35b. The air pipe 35b is filled with compressed air from a compressor (compressor) (not shown) of factory equipment. Accordingly, the air switch 37 is turned on / off by the operation of the operation handle 36a. The blowing nozzle 36 sends hot air from the nozzle port 36b by operating the operation handle 36a, and the air switch is turned on, and the air signal is sent to the control device 39 to activate the pressure switch 38 and the motor, etc. Is controlled. By attaching the air switch 37 to the spray nozzle 36, sparks are not generated by ON / OFF as in an electrical switch, and it can be safely used even in an atmosphere where volatile gas or the like is generated. Since the air volume / wind pressure described later can be increased, the length of the blower pipe (hose) can be extended longer, for example, 10 m or more.

As shown in FIG. 2, the apparatus main body 11 is connected to a motor 15 that rotates at a predetermined number of revolutions, and an electromagnetic clutch 16 connected to the motor 15 and sucks outside air by rotating the motor. Roots blower 17 that is compressed and discharged, a heat accumulator 22 that is connected to the discharge side of the roots blower and stores the heat of the compressed air, and a compressed air discharged from the heat accumulator connected to the discharge side of the heat accumulator From the heat accumulator 22 by connecting the switching valve 27 having two discharge valve ports 27a and 27b for switching to two different directions and connecting the one discharge valve port 27a side of the switching valve 27 and the intake side of the roots blower 17. Compressed air discharged from the heat accumulator 22 connected to the return blower pipe L ₄ for returning the discharged compressed air to the roots blower 17 and the other discharge valve port 27 b of the switching valve 27. And a control device 39 for controlling the motor and the like including motor control means for controlling the motor 15.

Roots blower 17 connects the suction pipe L ₁ of the outside air to the intake port 19a side, between the discharge port 19b and the heat storage unit 22 connecting pipe L _2, between the regenerator 22 and the switching valve 27, connecting pipe It is connected respectively L _3. The outside air intake pipe L ₁ is provided with an intake port 21 at the tip thereof, and outside air is sucked from the intake port 21. The outside air is fresh air taken in the box-type case 12 via the outside air filter 14 and air heated in the case and heated by the roots blower 17 or the like. Since such outside air is taken from the intake port, the temperature is higher than the outside air temperature taken from the outside of the box-shaped case 12, and the thermal efficiency is improved. Further, in the middle of the suction pipe L _1, one end of the feedback blower tube L ₄ is coupled.

  The Roots blower 17 is equipped with a blower filter 17A that cleans the air sucked into the suction port 19a and has a silencing function. An electromagnetic clutch 16 is installed between the motor 15 and the roots blower 17, and is connected and disconnected by the electromagnetic clutch 16. Each of the motor 15 and the roots blower 17 is provided with a pulley (not shown) having a predetermined size, and a power transmission means, for example, a belt or the like is suspended between these bullies. The heat accumulator 22 is provided with a temperature sensor 22a. The control device 39 includes control means for controlling the motor 15, clutch control device for controlling the electromagnetic clutch 16, valve control means for controlling the switching valve 27, temperature control means for controlling the hot air temperature, and the like.

Among these components, the motor 15, the roots blower 17, the heat accumulator 22 and the return air duct L ₄ are accommodated in the box-type case 12. The control device 39 is composed of a control circuit board (not shown) including a microcomputer, and this control circuit board is also housed in the box-type case. In addition, an intake fan 14 a is disposed near the outside air filter 14 of the box-type case 12, and the intake fan 14 a is connected to the motor 15.

The hot air generator 10 is controlled by a control device 39. The outline of the control is as follows. First, the control device 39 rotates the motor 15 to operate the roots blower 17, sucks outside air into the roots blower and compresses it, and then compresses the compressed air into the heat accumulator 22, the switching valve 27 and through the feedback blower pipe L ₄ is fed back to the Roots blower 17. During this route, the outside air is compressed and heated by the roots blower 17 to a predetermined temperature, and the heat accumulator 22 is stored at this temperature. The returned compressed / heated air is compressed and heated again by the Roots blower 17, and the heat accumulator 22 is stored at a higher temperature. Thereafter, this circulation route is continuously continued, and the temperature is raised every time it is circulated, and a higher temperature is stored in the regenerator 22. Therefore, hot air is blown from the blower pipe 35 to the outside after the circulation route is stored at a predetermined temperature through the circulation route at least once. That is, as shown in FIG. 2, this circulation route is route a ₁ → roots blower 17 → route a ₂ → heat accumulator 22 → route a ₃ → switching valve 27 → route a ₄ → route a ₁ After passing through at least once, the discharge valve port 27b of the switching valve 27 is opened, and hot air of a predetermined temperature is blown from the blower pipe 35. Further, when hot air is blown to the blower pipe 35, the air passing through the circulation return path is reduced, so that the reduced amount is supplemented from the outside air. The replenished air is heated by a circulation route, and a substantially constant hot air is blown from the heat accumulator.

  According to the hot air generator 10, since heat from the roots blower is once stored and adjusted in the heat accumulator using the roots blower, stable hot air can be blown. In other words, hot air can be generated and blown without using a conventional heat source such as a sheathed heater or a carbon heater that easily induces ignition without using a heater. In addition, since a roots blower is used, the air volume can be increased and the air pressure can be increased as compared with a hot air generator that blows air with a conventional fan blower. As a result, it is possible to lengthen the length of the blower pipe that blows hot air having a desired wind pressure and air volume and blows the hot air from the hot air generating unit to the object to be dried. If the blast pipe is lengthened, it is not necessary to install the apparatus main body 11 outside the booth and bring it into the booth, and for example, safety is ensured for volatile paint. Further, since the wind pressure is strong and the air volume can be increased, the size and the cost can be reduced. Hereinafter, each configuration will be described in detail.

  First, the roots blower will be described with reference to FIGS. 3 is a cross-sectional view for explaining the operation of the roots blower constituting the hot air generator of FIG. 2, and FIG. 4 is a characteristic diagram of the roots blower of FIG.

  The roots blower 17 is classified as a rotary blower, and a two-shaft roots blower is commonly used. This Roots blower 17 is a positive displacement blower, which compresses and sends out a certain amount of gas (air) in proportion to the rotational speed, and can be operated with high efficiency in the entire region from low speed to high speed. That is, it has a feature that it can discharge (blow) a desired strong wind force with a desired air volume, and can increase the air volume and wind force compared to a conventional blower.

  As shown in FIGS. 2 and 3, the Roots blower 17 includes a pair of rotors 20a and 20b in a casing 18 having a suction port 19a at one end, a discharge port 19b at the opposite end and a space having a predetermined shape. A pair of rotors 20a and 20b are rotated 90 ° out of phase with each other and rotated in opposite directions, whereby a certain amount of gas (air) 21a trapped between the casing 18 and the rotors 20a and 20b is discharged. The pressure is increased by the resistance on the discharge side at the outlet and discharged.

  In the roots blower 17, the casing 18 is made of aluminum and the rotor is made of heat-resistant resin. With this configuration, the weight is reduced and high-speed rotation is also possible. Further, a small narrow gap (for example, about 0.2 mm) g is provided between the casing 18 and the rotors 20a and 20b. The Roots blower 17 is configured to increase the intake air to a high temperature of a predetermined temperature by compression heat generated during air compression, friction heat generated by the high-speed rotor, and friction heat generated when the high-speed rotor passes through the gap. Be warmed.

As shown in FIG. 2, the roots blower 17 has a blower filter 17A attached to the suction port 19a. The blower filter 17A is made of stainless steel wool, the air from the suction pipe L ₁ of the outside air while washing with the filter, which is intended to reduce the noise generated due to high-speed operation of the Roots blower 17. The blower filter 17A is not limited to stainless steel wool, and may be another member, for example, a metal net. Discharge port 19b is connected to the regenerator 22 through the connecting pipe L _2. The blower filter 17A is provided at the suction port, but may be provided at the discharge port side, or may be provided at both the suction port and the discharge port.

The roots blower 17 has the characteristics shown in FIG. This characteristic diagram is obtained when the horizontal axis represents the discharge amount (Discharge.m ³ / h; D _{1 to} D ₁₀ ) and the vertical axis represents the compression ratio (Presser Rasio; Pd / Ps: P _{1 to} P ₇ ). 4 shows the state of changes in the temperature (K) of the Roots blower 17, the rotational speed (Rv) of the motor 15, and the motor capacity (W _{1 to} W ₅ ), where K in FIG. The capacity, E, is an efficiency curve. From this characteristic diagram, a predetermined temperature curve is drawn according to the rotational speed of the motor. For example, when the rotational speed of the motor 15 is increased and the rotational speed is RV ₅ , the temperature rise at the point where the temperature curve K intersects is KR _V. This temperature rise temperature KR _V is a temperature discharged from the roots blower 17 and is a temperature rise temperature before returning, in which outside air is taken into the roots blower 17 and compressed and heated, and is added to the outside air temperature. It has become. That takes outside air into the roots blower 17, when continuous operation without feedback, the hot air of the heating temperature KR _V is blown from the Roots blower 17. For example, if an 8 KW motor 15 is connected to a roots blower of 1460 cm ³ / rev and this motor is rotated at 5000 rpm, the temperature becomes normal temperature plus 80 ° C. to 90 ° C.

  The roots blower 17 is not limited to a two-shaft roots blower, and other roots blowers, for example, a three-leaf roots blower, a vane blower, or a multistage turbo blower may be used. By selecting and using these Roots blowers, it becomes possible to generate hot air heated to a desired temperature while making the desired air volume and pressure using the characteristics of each blower.

  The heat accumulator will be described with reference to FIGS. 6 shows a heat accumulator, FIG. 6A is an external perspective view, FIG. 6B is an exploded perspective view, FIG. 7 shows the heat accumulator of FIG. 6, and FIG. 7A is a cross-sectional view taken along line VIIA-VIIA in FIG. 7B is a sectional view taken along the line VIIB-VIIB in FIG. 6A, FIG. 7C is a sectional view taken along the line VIIC-VIIC in FIG. 6A, FIG. 8A is an exploded view of the heat storage member constituting the heat accumulator in FIG. 9 is a sectional view taken along line VIIIB-VIIIB, FIG. 9 shows the heat storage member of FIG. 8, FIG. 9A is a plan view of the heat storage member extended, FIG. 9B is a side view of the storage case, and FIG. FIG. 9D is a perspective view illustrating a state in which hot air passes.

Regenerator 22, as shown in FIG. 6, a supply header 26A having a pair of heat storage unit 23A laminated on upper and lower stages, and 23B, the suction port 26 ₁ of air attached to one end of these thermal storage units, other It is attached to an end and a discharge header 26B having a discharge port 26 ₃ of air. As shown in FIG. 8A, the pair of heat storage units 23A and 23B are stacked with the top and bottom reversed, and have the same configuration. Hereinafter, one heat storage unit 23A will be described with reference to another heat storage unit 23B.

As shown in FIG. 8, the heat storage unit 23 </ b> A includes wave-shaped heat storage fins 25 that serve as heat storage members, and a storage case 24 that stores the heat storage fins 25. The storage case 24 is a relatively long bowl-shaped case having a substantially U shape. The trough-shaped case 24, rectangular and the bottom plate portion 24a, a pair of predetermined height which is bent at right angles in the same direction from the longitudinal side edges of the bottom plate portion having a predetermined width dimension B ₁ and a length B ₂ The side plate portion 24b and the opening portion 24c that opens between both side plate portions are formed, and the whole is substantially U-shaped and is formed of a metal material having a predetermined plate thickness. This metal material is, for example, aluminum or an aluminum alloy. Specific dimensions of the accommodating case 24, for example, the width length _{B 1} represents 70 mm, length _{B 2} is 400 mm, height B3 of the side plate portion 16～30Mm, the thickness of the metal plate is 1.2 mm.

The heat storage fin 25 has both a heat storage function and a noise reduction function, and is formed of a corrugated molded body obtained by processing a metal plate having a predetermined thickness, such as aluminum or an aluminum alloy plate. The heat storage fins 25, as shown in FIG. 9A, a metal plate (heat storage plate) 25A having a predetermined size, a predetermined region of the metal plate, i.e. the wide area x ₁ which is wider in the longitudinal direction, in this region Adjacent and narrow narrow regions b are partitioned so as to appear alternately, and in the direction orthogonal to the longitudinal direction, a similar wide region y ₁ and a narrow region b ′ adjacent thereto are also provided. Divide into
These sections are, in order, x ₁ , b, x ₂ , b, x ₃ , b to x _{n in} the longitudinal direction, y ₁ , b ′, y ₂ , b ′, y ₃ , in the direction orthogonal to the longitudinal direction. the b'~y _n. A region surrounded by these regions, that is, a plurality of narrow grooves (slits) 25a that allow a part of hot air to flow in a predetermined direction through a region having a predetermined area, and a region having a predetermined area adjacent thereto And a plurality of fine grooves (slits) 25b through which a part of the hot air is diverted and passed in the opposite direction. For example, the region in the longitudinal direction, that is, the region x ₁ × y ₁ is repeated in this order so that _one air blowing direction is present and the adjacent region x ₂ × y ₁ is the other air blowing direction. In the region orthogonal to the longitudinal direction, that is, the region x ₁ × y ₁ is repeated in the following order in _one blowing direction, and in the adjacent region x ₁ × y ₂ in the other blowing direction. Therefore, in the areas S _{1 to} S ₄ shown in FIG. 9, the slits of each area are arranged in the slits 25b, 25a, 25b, and 25a, which is a kind of louver that is blown by changing the blowing direction to zigzag. . The slits 25b and 25a in the respective regions are substantially equidistant and have different blowing directions, and are formed by punching or the like. In the metal plate 25A, the narrow region b becomes a peak or a valley bottom at the time of processing into a corrugated shape, and the narrow region b ′ becomes a segmented region that divides each region. The metal plate 25A punched in this way is formed into a corrugated shape by bending, and then stored in the storage case 24, so that a narrow region b serving as a peak or valley bottom is formed on the plate wall surface of the storage case 24. Weld (with brazing). In addition, although the opening part 24c is open | released, you may cover this opening part with a cover body (illustration omitted). The heat storage fin 25 can be unitized by covering with a lid. The heat storage fins 25, as shown in FIG. 9D, the hot air is blown from the arrow C ₁ direction, it enters into the mountain-gap, the intruding hot air, a hot air C ₁₁ Tsuranukeru street from intact mountain-gap , it is blown divided into a hot air C ₁₂ passing through the slit. A hot C ₂ hot air C ₂₁ Tsuranukeru street from gaps valley similarly entering into another valley gap, it is blown divided into a hot air C ₂₁ passing through the slit. Therefore, when the hot air is blown to the heat storage fins 25, the hot air meanders and passes through the surfaces of the heat storage fins 25 and the slits 25a and 25b, so that the contact area with the hot air is increased, and the heat is efficiently stored and silenced. The effect is demonstrated.

Supply header 26A, as shown in FIG. 7B, and has a fitting hole 26 ₂ the suction port 26 _1, a pair of heat storage unit 23A to the other end, 23B is fitted to one end. Discharge header 26B, as shown in FIG. 7C, the discharge port 26 ₃ at one end, a pair of heat storage units 23A, 23B has a fitting hole 26 ₄ is fitted to the other end

  The heat accumulator 22 is assembled by first assembling a pair of heat accumulator units 23A and 23B and mounting the supply header 26A and the discharge header 26B on both ends of the assembly. Since the heat storage member 22 is unitized, the heat storage unit 22 can obtain a desired heat storage amount by increasing or decreasing the number of the heat storage members. The heat accumulator 22 is provided with a temperature sensor 22a in order to detect the heat storage temperature of the heat storage member. In addition, the heat accumulator 22 preferably includes a member having a silencing action, such as a metal fiber filter, in the supply header 26A. This filter can reduce noise caused by high-speed operation of the Roots blower. In addition, although the muffler filter was housed in the supply header, it may be installed outside the regenerator 22 or may be installed between the Roots blower and the regenerator. Moreover, it is preferable that a heat storage unit accommodates heat storage units 23A and 23B etc. in an airtight container, and provides a heat insulation and heat retention member in the exterior of this airtight container.

  As described above, the heat storage fin 25 is formed of a corrugated molded body provided with a narrow groove (slit). However, the heat storage fin 25 is not limited to this, and has a different shape or a member. Any material may be used as long as it has both a heat storage function and a sound deadening function.

The switching valve will be described with reference to FIGS. FIG. 10 is a perspective view of a switching valve provided with a valve opening / closing mechanism. Switching valve 27, as shown in FIG. 10, the three-way changeover valve having three valve ports, i.e., one of the inlet valve port 27 ₀ and a pair of exhaust valve ports 27a, and 27b, these emissions valve port 27a, 27b A valve lid 27c for opening and closing the valve opening, and opening and closing these discharge valve openings by operating the handle 27d. The switching valve 27 is opened or closed manually or by power. In the switching valve 27, the area of the valve port where the valve lid 27c closes the discharge valve port 27b is changed according to the rotation angle of the handle 27d, that is, the opening degree of the discharge valve port 27b is changed to 0% to 100%. The By changing the opening degree, the amount of hot air passing through the discharge valve port 27b is changed, and this amount of air is blown to the blowing nozzle 36 through the blower pipe. Therefore, the switching valve 27 can blow a desired air volume to the spray nozzle 36 by operating the handle 27d.

  The operation of the switching valve 27 can also be performed by a valve opening / closing mechanism using power. FIG. 10 shows an example of an opening / closing mechanism that opens and closes the switching valve 27. As shown in FIG. 10, the valve opening / closing mechanism 28 is connected to the end of the handle 27d, and is a compression spring body (or a torsion spring) 29 that urges the discharge valve port 27b in a direction to be normally closed and placed. An air drive device 30 connected to the same handle 27d and pulling the handle against the spring force of the compression spring body to open the discharge valve port 27b, and compressed air supply adjustment for pressurizing and extracting compressed air to and from this air drive device A pressure regulator 32 between the device 31 and the air drive device 30 and the compressed air supply adjustment device 31 to adjust the amount of compressed air to the air drive device 30, and the pressure regulator 32 and the air drive device 30 are It is connected to the compressed air supply adjusting device 31 by a pipe having a predetermined thickness. Since a compression spring body (or a torsion spring) is used as the spring body 29, the burden on the air drive device 30 can be reduced. That is, by using the compression spring body, the discharge valve port 27b can be always closed when the air drive device 30 is not operated. Reference numeral 33 denotes a supply pipe that is connected to a compressor or the like and supplies compressed air to the compressed air supply adjusting device 31, and reference numeral 34 denotes a discharge pipe. The supply pipe 33 is connected to a compressor installed in the factory.

The valve opening / closing mechanism 28 first sets the pressure regulator 32 to a predetermined value, that is, the rotation angle of the handle 27d to a predetermined angle. This rotation angle is the opening degree of the discharge valve port 27b, and the opening degree of the discharge valve port 27b is changed to a range of 0% to 100% by this rotation angle. When compressed air is supplied from the compressed air supply adjustment device 31 to the air drive device 30 via the pressure regulator 32, the cylinder 30 a is retracted into the device, and as a result, the handle 27 d is spring force of the compression spring body 29. The discharge valve port 27b is opened with the opening degree set by the pressure regulator 32, and the amount of hot air passing through the discharge valve port 27b is adjusted.
Therefore, when this valve opening / closing mechanism 28 is used, when the rotation angle of the handle 27d is set by the pressure regulator 32, the discharge valve port 27b is opened with a predetermined opening degree, and the air flow rate can be adjusted. In particular, when the discharge valve port 27b is opened to 100%, hot air with a large air pressure and a large wind pressure is blown to the blowing nozzle 36, which may not be preferable in the usage form. Can be used with air volume. The valve opening / closing mechanism 28 uses air pressure, but may use hydraulic pressure or a motor.

  The spray nozzle 36 has an operation handle 36a, a nozzle port 36b for blowing air to the outside by the operation of the operation handle, and an air switch 37 which is similarly turned on / off by the operation of the operation handle. The blowing nozzle 36 sends hot air from the nozzle port 36b by operating the operation handle 36a, and the operation ear switch 37 is turned on, and this air signal is sent to the control device 39 via the blower pipe, and the motor 15 etc. are controlled.

  The control device 39 is a control means for controlling the motor 15, a clutch control device for controlling the electromagnetic clutch 16, a valve control means for controlling the switching valve 27, a temperature control means for controlling the temperature based on a detected value from the temperature sensor 22a, and an air switch. Control means for controlling the motor by operating the pressure switch 38 in response to an air signal from 37 is provided. The temperature is controlled by installing a microcomputer (not shown). The temperature control means controls the hot air temperature and prevents overheating of the heat accumulator and the roots blower. Since the rated temperature of the Roots blower is 130 ° C., it is possible to prevent this temperature from being exceeded by controlling in this way.

The operation of the hot air generator 10 will be described mainly with reference to FIGS. First, the switching valve 27 opens one discharge valve port 27a and closes the other discharge valve port 27b. This operation is performed manually or by the valve opening / closing mechanism 28. In this state, the power switch of the operation panel 11a is turned on and the electromagnetic clutch 16 is operated. When the power switch is turned on, the motor 15 is rotated at a predetermined high speed, for example, 5000 rpm, and the roots blower 17 is operated via the electromagnetic clutch 16. The operation of the electromagnetic clutch 16 is performed by a signal from the control device 39. When the motor 15 rotates at a high speed, the motor 15 and the roots blower 17 are connected by a power transmission means (belt), so that the roots blower 17 operates at a high speed corresponding to the rotational speed of the motor 15. When Roots blower 17 is high-speed operation, the suction port 19a of the Roots blower 17, outside air is sucked through the suction port 21 via the suction pipe L _1.

This outside air is sucked into the suction port 19a through the blower filter 17A. The sucked outside air is compressed and heated in the roots blower 17. That is, the intake air is heated by compression heat generated by compression, frictional heat generated by high-speed rotation of the rotor, frictional heat generated when the high-speed rotor passes through a narrow gap between the casing and the rotor, and the like. . The compressed air whose temperature has been raised is discharged from the discharge port 19 b and blown to the heat accumulator 22. In the heat accumulator 22, the compressed air whose temperature has been raised passes between the heat storage fins 25, and the temperature rise heat is stored in the heat storage fins 25 during this passage. That is, when hot air is blown to the heat storage fins 25, the hot air meanders and passes through the surfaces of the heat storage fins 25 and the slits 25a and 25b, so that the contact area with the hot air is increased and heat is efficiently stored and silenced. The Compressed air passing through the regenerator 22 through the feedback blower pipe L ₄ passes through the exhaust valve port 26a of the switching valve 27 is fed back to the Roots blower 17. In the Roots blower, the temperature is further raised and sent to the heat accumulator 22, and the raised heat is stored in the heat accumulator. Thereafter, this circulation is repeated and continued.

That is, as shown in FIG. 2, the circulation route of route a ₁ → roots blower 17 → route a ₂ → heat accumulator 22 → route a ₃ → switching valve 27 → route a ₄ → route a ₁ is routed at least once. Thereafter, when the temperature of the heated compressed air in the circulation route is a predetermined temperature, that is, when the temperature of the heat accumulator 22 reaches a predetermined temperature, the discharge valve port 27b of the switching valve 27 is opened, and hot air at a predetermined temperature is generated. Ventilate from the air duct. Further, when hot air is blown to the blower pipe, the air passing through the circulation return path is reduced, so that the reduced amount is supplemented from the outside air. The replenished air is heated by a circulation route, and a substantially constant hot air is blown from the heat accumulator.

When the opening degree of the discharge valve port 27b of the switching valve 27 is set in advance, the hot air generator 10 can blow a desired air volume to the spray nozzle 36.
The switching valve 27 is adjusted manually or by the valve opening / closing mechanism 28.

Relationship between the hot air generator 10 and the switching valve 27 and spray nozzle 36, as shown in FIG. 5, when the outside air is sucked into the roots blower 17, from this Roots blower 17, higher than the outside air temperature T ₁ of the predetermined temperature is ejected hot air temperature the temperature T _2, the heat accumulator 22 is heat storage at this temperature. Then, when the circulation route of FIG. 2, that is, route a ₁ → roots blower 17 → route a ₂ → heat accumulator 22 → route a ₃ → switching valve 27 → route a ₄ → route a ₁ is repeated, a desired time t ₁ is obtained. it reaches the hot air temperature _{T 4} to. During these periods, the discharge valve port 27a of the switching valve 27 is opened and the other discharge valve port 27b is closed. After time _{t 1} is discharged valve port 27b of the changeover valve 27 is opened. In the state where the switching valve 27 is opened, the blowing nozzle 36 is operated to blow hot air.

[Example]
The capacity of the motor 15 was 7.5 KW, the capacity of the roots blower was 1460 cm ³ , the heat storage unit of the heat accumulator 22 was 4 units, the rotation speed of the motor 15 was 5000 rpm, and t ₁ was heated to 130 to 140 ° in 60 seconds. The regenerator stores heat at this temperature. The blower tube (hose) 35 had an inner diameter of 32 mm and a length of 10 meters, and the amount of blown air was measured at the blower opening of the spray nozzle 36 to obtain a blown amount of 6 to 7 m ³ / min and a wind pressure of 40 to 50 KPS. Moreover, the noise was reduced to about 1/20 or less compared with the case where no noise reduction measure was taken.

DESCRIPTION OF SYMBOLS 10 Hot air generator 11 Apparatus main body 11a Operation panel 12 Box-type case 14 Intake filter 15 Motor 16 Electromagnetic clutch 17 Roots blower 17A Blower filter 18 Casing 19a Intake port 19b Discharge port 20a, 20b Rotor 22 Regenerator 22a Temperature sensor 23A, 23B Thermal storage unit
24 Storage case 25 Heat storage fin 25A Metal plate (heat storage plate)
25a, 25b Slit 26A Supply header 26B Discharge header 27 Switching valve 27a, 27b Discharge valve port 28 Valve opening / closing mechanism 29 Spring body 30 Air drive device 31 Pressure regulator 35 Hose (blower pipe)
36 Spray nozzle 37 Air switch 38 Pressure switch 39 Control device L ₄ Return air blow pipe L ₁ Suction pipe

Claims (12)

A motor that rotates at a predetermined number of revolutions, a roots blower that is connected to the motor and sucks outside air, compresses and discharges it, and a regenerator that passes through the compressed air discharged from the roots blower and stores heat of the compressed air A switching valve connected to the discharge side of the heat accumulator and having at least two discharge valve ports for switching and blowing the compressed air discharged from the heat accumulator in different directions, and one discharge valve of the switching valve A return air pipe that connects the inlet side and the intake side of the Roots blower to return the compressed air discharged from the regenerator to the Roots blower; and the regenerator connected to the other discharge valve port side of the switching valve. A blower pipe for blowing the compressed air discharged from the outside to the outside, and a control device for controlling the motor including motor control means for controlling the motor,
The control device rotates the motor by the motor control means to operate the Roots blower, sucks outside air into the Roots blower and compresses the compressed air, and then compresses the compressed air to the heat accumulator, the switching valve, and the return air blower. Returning to the Roots blower via a pipe, and circulating the circulation air passage that passes through the same Roots blower and the heat accumulator at least once more, then hot air is blown from the blow pipe to the outside. Hot air generator.   The hot air generator according to claim 1, wherein the roots blower is one of a two-leaf roots blower, a three-leaf roots blower, a vane blower, and a multistage turbo blower.   The hot air generator according to claim 1 or 2, wherein the motor and the Roots blower are connected by an electromagnetic clutch, and the electromagnetic clutch is operated by a clutch control means provided in the control device.   The hot air generator according to any one of claims 1 to 3, wherein the roots blower is provided with a muffler filter on at least one of the intake port and the discharge port side.   2. The hot air according to claim 1, wherein the heat accumulator is provided with a temperature sensor, and the control device performs heat accumulation control of the heat accumulator to a predetermined constant temperature based on an output from the temperature sensor. Generator.   6. The hot air according to claim 1 or 5, wherein the heat accumulator is a heat storage member having a plurality of ventilation paths housed in a sealed case having a gas inlet at one end and a gas outlet at the other end. Generator.   The hot air generator according to claim 6, wherein the heat accumulator includes a sound deadening filter housed in the sealed case.   The heat storage member is formed in a corrugated member in which irregularities of a predetermined depth and height are alternately provided, and a plurality of slits for allowing a part of hot air to pass through are provided in the irregular wall surface. The hot cloth generator according to claim 7.   9. The plurality of slits are configured such that a plurality of areas having a predetermined area are partitioned on the uneven wall surface, and ventilation paths are alternately different in the plurality of partitioned areas. Heat cloth generator.   The hot air generating device according to claim 1, wherein the switching valve is provided with a valve opening / closing mechanism, and the amount of air blown to the blower pipe is adjusted by the valve opening / closing mechanism.   A long hose is connected to the blower pipe, a blowing nozzle is attached to the tip of the hose, an air switch is attached to the blowing nozzle, and hot air is controlled by an air signal from the air switch. The hot-air generator of Claim 1 characterized by the above-mentioned.   The hot air generator according to claim 11, wherein an air pipe for transmitting an air signal from the air switch is incorporated in the air duct.

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