JP2000182750A - Hot air generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot air generator with compact size and simple structure, capable of sending hot air of uniform temperature over the whole width of a blast opening with only one hot air generator, and freely changing temperature distribution by the position of the blast opening in the hot air generator in which electrically heated hot air is jetted from the slender and wide blast opening with a blower. SOLUTION: This hot air generator is constituted so that a blower 7 and a slender blast opening 5 are installed, one long cartridge heater 2 formed by dividing a heating element 3 contained in a blast duct 1 into two or more and a dedicated temperature sensor 4 corresponding to each heating element 3 are installed, and the divided heating element is separately controlled with one controller 6 comprising a temperature controller and a power control device to control blast temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air generator used for drying an object to be heated, and more particularly, to an air supplied from an air blower which is electrically heated by a cartridge heater to form a long and narrow air blower. The present invention relates to a hot air generator that blows out hot air at a temperature set from a mouth.

[0002]

2. Description of the Related Art In general, a hot-air generator using electric heating for the purpose of drying or the like is provided with a heating element (heater) in a box-shaped air duct, and a blower fan provided on one side of the air duct. Air is introduced into a ventilation duct from a ventilation device using a compressor or the like, the air is heated by a heating element, and hot air is blown out from a ventilation port provided at an end of the ventilation duct.

[0003] Examples of the heating element used in this hot air generator include a linear or belt-like heating wire and a cartridge heater. Among them, the cartridge heater used in the present invention has characteristics excellent in stability and durability. ing. As shown in FIG. 4, the general configuration of the cartridge heater includes an elongated cylindrical heating element main body 90 and a lead wire 100 for supplying power to the main body heating element. A heating wire 92 is wound around a conductive core 91, the periphery of the heating wire 92 is filled with an insulating material 93, and the surface is covered with a metal sheath 94.

When the temperature of the hot air generated by the hot air generator is controlled by using the heating element, a temperature sensor is provided at a blower opening serving as a hot air outlet and / or a heater or a heater in the vicinity of the heater and controlled by a controller.

[0005] Even if the general hot air generator and the temperature control means as described above are used, the problem is not so serious when the air outlet serving as the hot air outlet is small, but the object to be heated is dried while being moved on the conveyer. In such a case, it is necessary to provide air outlets that are linearly divided into one or a plurality of elongated and correspondingly arranged in this case, and in this case, the air outlets are stably uniform over the entire width of the air outlets or in all the divided air outlets. Blowing hot air at a temperature is a difficult problem. For example, as shown in FIG. 3, an extended hot air generator of the above-mentioned technology, that is, a long heating element 13 such as one cartridge heater 12 is provided in an elongated box-shaped ventilation duct 11, and a temperature sensor 14 and a controller 16 are provided. In a device that controls the temperature by using a blower 17 provided at one end of the duct 11
The air supplied from the heating unit 13 and heated by the heating element 13 and blown out from the blowing port 15 is supplied to the blowing port 15 near the blowing device 17.
a becomes low temperature, and the air outlet 15c far from the air blower 17
As the heating time inside the duct 11 becomes longer, the temperature tends to become higher, and this tendency becomes more remarkable as the air outlet 15 becomes longer.

[0006] In addition to the demand for a hot air generator having a wide air outlet, the above-described supply of hot air having a uniform temperature over the entire width, as well as the position of the air outlet or the air outlet depending on the purpose. There is a desire to blow hot air under temperature distribution conditions, and the above means cannot meet the demand.

Therefore, conventionally, as means for keeping the temperature of blown air blown over the entire width of a relatively wide blower opening constant, means for arranging a plurality of hot air generators side by side and controlling each under uniform conditions, -4666 and JP-A-8-152
As disclosed in Japanese Patent Application Laid-Open No. 269/1991, an elongated box-shaped nozzle box is provided at a hot-air outlet of a hot-air generator, and the temperature of the blown air and the amount of blown air are stabilized by the action of a rectifying plate or the like of the nozzle box to make the ejection temperature uniform. Something to do is suggested. On the other hand, as means for changing the blown air volume and temperature distribution depending on the position of the blower outlet or the blower outlet, a plurality of hot air generators are used as described above to control them by changing the conditions, or as disclosed in JP-A-10-23288. One hot air generator that adjusts the distribution ratio of hot air by setting the angle of the distribution plate in the distribution chamber provided in the three-way valve and arbitrarily sets the amount of hot air ejected from the multiple hot air blowing chambers Proposed.

[0008]

However, in the conventional means for making the blowing temperature uniform over the entire width of the blowing port, a plurality of hot air generating devices are required, or a separate nozzle is provided for the hot air generating device for stabilizing the jetting temperature. It is necessary to attach a box, and in this case, if the nozzle box is lengthened, a large number of hot air generators are required for one nozzle box, and in one hot air generator, the temperature distribution depends on the position of the air outlet or the air outlet. There is a problem that cannot be changed. On the other hand, in the conventional means for changing the blowing amount and the temperature distribution depending on the position of the nozzle, a plurality of hot air generating devices are required as described above,
On the other hand, in the case of using the distribution plate, the amount of hot air can be arbitrarily set for each air outlet, so that it is possible to achieve a different temperature setting and temperature distribution depending on the air outlet to some extent. Compared to typical temperature control
It is difficult to freely or accurately set or control the temperature, and one unit cannot cope with various temperature settings exceeding two conditions, and furthermore, there are many components and the structure becomes complicated. .

In view of the above, the present invention provides a single hot air generator having a narrow and wide air outlet so that hot air at a uniform temperature can be blown over the entire width of the air outlet, and the position of the air outlet or each air outlet can be freely adjusted. It is an object of the present invention to provide a hot air generator that is compact and has a simple structure, which does not require a separate component for stabilizing air temperature such as a nozzle box and a distribution plate, which can change the temperature distribution.

[0010]

Means for Solving the Problems A hot air generator of the present invention electrically heats air supplied from a blower installed at one end of a blower duct by a cartridge heater inside a long and narrow box-shaped duct. A hot-air generator that emits hot air from one or a plurality of elongated wide and narrow air outlets provided along the longitudinal direction of the duct and that is linearly arranged, and controls the temperature of the discharged air by a temperature sensor and a controller. The heating element incorporated in one long cartridge heater having a length corresponding to the elongated blowing port provided in the ventilation duct is provided by dividing into two or more heating elements. A dedicated temperature sensor is provided, and the divided heating elements are individually controlled by a single controller consisting of a temperature controller and a power control device to control the ejection temperature. It was configured to be.

[0011]

According to the hot air generator of the present invention, a plurality of heating elements incorporated in one long cartridge heater are divided and provided, and a dedicated temperature sensor is provided for each heating element. Since the temperature of the heating elements can be controlled separately, for example, as described above with reference to FIG. 3, even when the temperature varies depending on the position in the air duct, each of the heating elements is separately controlled. This makes it possible to stabilize the temperature of the hot air to be blown out, and to use a single hot air generator to create a wide air outlet without using multiple hot air generators or a separate blower box or distribution plate as a separate component. It is possible to blow hot air under more stable conditions over the entire width, and it is also possible to set an arbitrary temperature for each heating element.

A plurality of cartridge heaters are provided in a wide box-shaped duct in parallel with an air outlet in a wide box-shaped duct, which is a means similar to the present invention capable of solving the above-mentioned problems, and a temperature sensor corresponding to each of them is provided. In comparison with the case where each of the cartridge heaters is controlled separately, the use of only one cartridge heater with a divided heating element makes it possible to use a single controller related to the control. The number of parts can be reduced along with the number of parts used, and the apparatus can be made compact.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a hot air generator according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic structural view of the entire hot-air generator of the present invention, which has a blower 7 and an elongated blower port 5 at the end of an elongated box-shaped blower duct 1. A cartridge heater 2 in which a heating element 3 is divided into a plurality of portions and a temperature sensor 4 corresponding to each of the divided heating wires 3 are provided inside 1, and are connected to an external controller 6 to be schematically configured.

More specifically, an elongated box-shaped ventilation duct 1
A blower 7 using a compressor or the like serving as a blower source while supplying air to one end in the longitudinal direction of the blower is provided. On the other hand, an elongated blower port 5 is formed as a hot blowout port along the longitudinal direction of the blower duct 1. Provide. In addition, the length of the blowing port 5 is
Considering the objects and effects of the present invention, 300 mm to 300 mm
About 0 mm is effective, and depending on the purpose,
It may be a long one, or may be one that is divided into a plurality and arranged linearly (such as 15a, 15b, 15c in FIG. 3).

In the box of the air duct 1, a long cartridge heater 2 having a heating element 3 divided into three insides in parallel with the air outlet 5, and a space between the cartridge heater 2 and the air outlet 5. A temperature sensor 4 such as a thermocouple is provided at a position corresponding to each of the divided heating elements 3. The number of divisions of the heating element 3 is selected according to the length or the number of the air outlet 5, and the temperature sensor 4 may be mounted directly on the cartridge heater 2 or near the air outlet 5. However, a position effective to individually control the divided heating elements 3 is selected.

Each of the heating elements 3 and the temperature sensor 4 are connected to a controller 6 comprising a temperature controller 6a and a power controller 6b separately provided by lead wires.

FIG. 2 is a wiring diagram schematically showing a cartridge heater 2 in which a heating element 3 used in the hot air generator according to the present invention is divided into multiple parts. The basic structure of the cartridge heater 2 is the same as that shown in FIG. It is the same except for the heating element and the heating element. The heating element is constituted by arranging three heating elements 3 linearly inside a single long cartridge heater 2 so as to divide the heating element, and one of the lead wires of each heating element 3 is common. One of them is separately wired to the controller 6 so that each can be controlled separately.

[0019]

According to the hot air generator of the present invention, the heating element incorporated in the cartridge heater is divided into a plurality of parts, and a dedicated temperature sensor is provided for each of the heating elements. By controlling the temperature, it is possible to blow hot air at a uniform temperature over the entire width of the wide air outlet, and by changing the set temperature of each heating element, the hot air blowing temperature can be changed depending on the position of the air outlet. The distribution can be changed arbitrarily.

Further, since the heat generating portion is configured as described above, such as using only one long cartridge heater, a plurality of hot air generating devices and a blowing box and a distribution plate are used as separate components. Since there is no need,
It is possible to provide a hot air generator having a compact and simple wide air outlet.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a wiring diagram schematically illustrating a cartridge heater according to an embodiment of the present invention.

FIG. 3 is a schematic view showing an example of a conventional hot air generator having a wide nozzle.

FIG. 4 is a structural diagram of a conventional general cartridge heater.

[Explanation of symbols]

 1,11. Air duct 2,12. Cartridge heater 3,13. Heating element 4, 14. Temperature sensors 5, 15, 15a-c. Blow port 6,16. Controller 6a. Temperature controller 6b. Power control device 7, 17. Blower 90. Main body section 91. Core 92. Heating wire 93. Insulation material 94. Sheath 100. Lead

Claims (1)

[Claims] 1. A hot-air generator in which an electrically heated hot air is blown out from a long and narrow blower opening 5 by a blower 7, wherein a plurality of heat-generating units are linearly arranged in a blower duct 1. A single cartridge heater 2 having a built-in body 3 and a dedicated temperature sensor 4 corresponding to each of the divided heating elements 3 are installed, and the blower temperature is controlled by a controller 6 including a temperature controller 6a and a power controller 6b. A hot-air generator characterized by controlling.