JP2019052814A - Hot air generation heater - Google Patents

Abstract

To provide a hot air generation heater capable of unitizing a heating part to increase capacity stepwisely.SOLUTION: A heating part 13 is composed of a box-shaped metal cartridge whose front and rear parts are opened. In the heating part, a plurality of block-shaped insulators is juxtaposed. In gas circulation holes provided in a front-back direction of the insulators, heating wires are disposed. A terminal of each heating wire is connected to a plurality of electrode bars 20 disposed at upper and lower parts of the metal cartridge of the heating part. The electrode bars 20 are inserted and supported into an insertion hole of a metal support plate 17 supporting the heating part 13 in a body part 11. Each base end part of the electrode bars 20 is provided so as to reach a power distribution part 16 provided outside a base end part of the body part 11. The power distribution part 16 is provided at the base end part of the body part 11 through the heating part 13 of the body part 11 and a heat insulation member. The electrode bar 20 is insulated from the insertion hole of the metal support plate 17 and not fastened thereto.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot air generating heater capable of discharging high temperature hot air of 800 ° C. or more from normal temperature gas, and uses exhaust air composed of high temperature hot air, and this exhaust air is supplied by a heat resistant blower or the like. It can also be used as a hot air circulation type hot air generating heater that can further heat the hot air and discharge high temperature hot air.

A conventional heater for generating hot air will be described with reference to FIGS.
FIG. 8 is a perspective explanatory view of an insulator, and FIG. 9 is a conceptual explanatory view of a heater for generating hot air.
The insulator 50 shown in FIG. 8 is a so-called (round) lotus insulator having a cylindrical shape, and a large number of through holes 52, 52,... Are provided in the axial direction, and each of the through holes 52 is provided. A heating wire such as a nichrome wire is wired.

The supply gas flows in the axial direction (gas flow direction) D, passes through the through holes 52, and is heated.
An appropriate number of the insulators 50 are arranged in the axial direction, overlapped so that the positions of the respective through holes 52 coincide with each other, and arranged in the heater for generating hot air.

FIG. 9 shows a hot air generating heater 60 in which the insulator 50 is disposed.
Four insulators 50 are arranged in series in the axial direction (gas flow direction D) in a heater housing 65 having a gas supply port 61 on the right end side in the drawing and a hot air discharge port 62 on the left end side in the drawing. Is fixed.

  The number of the insulators 50 arranged is appropriately determined according to the heater capacity. When arranging the insulators 50, the positions of the respective through holes 52 are arranged at the same position. Then, as indicated by the two-dot chain line in the figure, a nichrome wire is wired in these through holes 52 from the supply port 61 side to the discharge port 62, and then from the discharge port 62 side to the supply port 61 side. Wiring one after another in a zigzag pattern. By setting the number of through holes 52 of the insulator 50 to an even number, both terminals of the nichrome wire can be positioned on the supply port side.

Each insulator 50 is fixed by a long-axis bolt 66 and a nut 67. These bolts and nuts are fixed using two to four places of any through holes 52 provided in the insulator 50.
Although not shown, a temperature sensor such as a thermocouple for preventing abnormal overheating can be disposed in any of the through holes 52 located in the central portion.
The discharge temperature detection sensor T for detecting the discharge temperature is disposed in front of the insulator located closest to the discharge port in the heater housing 65.

In the invention described in the following Patent Document 1, the insulator itself is formed from a plurality of constituent pieces and laminated, and the heating wire is twisted by slightly shifting the position of the gas circulation holes in the adjacent insulator constituent pieces in the circumferential direction. In this configuration, the heating wire can be securely fixed.
In the invention described in Patent Document 2, the object is to improve the heater for generating hot air described in Patent Document 1, and to manufacture a heater for generating hot air having a simpler configuration. Let that be the issue.

In the invention described in Patent Document 2, unlike the one described in Patent Document 1, a combination of an insulator and a heating wire is devised, so that even if the insulator itself does not hold the heating wire, there is no problem. The present inventors have devised a heater for generating hot air that can discharge high-temperature hot air at a temperature of ℃ or higher.
And the compactness, weight reduction, resource saving, and cost reduction are achieved, and even if compared with the conventional heater, the performance is improved more than that without degrading the performance, that is, the ventilation The efficiency of heat exchange to gas was improved, and even when the flow rate or flow rate of the blown gas was small, it was possible to obtain a discharge gas temperature equal to or higher than the conventional one.

Table 2005/78357 JP 2012-57892 A

There is a change in the use of hot hot air in the current market.
In other words, until now it was mainly performed by hot air to dry, keep warm, drain water, recover insulation, etc. Recently, in the field of “furnace”, which is generally used, clean hot air of 300 to 600 degrees Celsius at high temperature. It is used in a furnace that requires heat treatment, and an electric hot air generator that supplies the furnace, and is used for light metal preheating, annealing, annealing, heat treatment, and the like.

Therefore, the conventional small hot-air generating heater as described above cannot cope with it, and there is a need to consider scale-up.
Therefore, for this scale-up, it is necessary to use many insulators to wire heating wires to increase the capacity thereof. For example, these insulators are made of metal containers (metal cases or metal cartridges). It is an object of the present invention to realize an idea that a unit can be put in a unit and a plurality of larger capacities can be arranged to realize stepwise scale-up.
Further, at that time, the metal cartridge and the like are thermally expanded by heating, and are repeatedly expanded and contracted in use. Therefore, the terminal portion for supplying a current to the heater is also repeatedly expanded and contracted, It is also an object of the present invention to allow the latter to follow the former or to separate the two.
In addition, since hot air is circulated using hot air as the supply gas, improvement of the supply port portion for supplying the hot air is also an object of the present invention.

  In order to solve the above-described problem, in the first aspect of the present invention, a gas supply port is provided on the base end side, and a heating portion is provided inside the main body portion provided with a discharge port on the distal end portion. An insulator is provided in the section, and a heating wire is provided in a number of gas flow holes provided in the front-rear direction of the insulator, and the supply gas supplied from a blower or the like through a supply port is supplied to the gas flow. In the hot air generating heater that can be heated by circulating in the hole and discharging hot hot air from the discharge port, the heating part is composed of a box-shaped metal cartridge that is open at the front and back, and inside the block-shaped insulator A plurality of heating wires are arranged in parallel, and heating wires are arranged in gas flow holes provided in the front-rear direction of these insulators, and terminals of each heating wire are arranged at the upper and lower portions of the metal cartridge of the heating unit. Connected to multiple electrode rods The electrode rods are supported by being inserted through insertion holes of a metal support plate that supports the heating unit within the main body, and the base ends of these electrode rods are respectively connected to the power distribution units provided outside the base end of the main body. The power distribution unit is provided at the base end of the main body through a heating unit and a heat insulating member in the main body, and the electrode bar is insulated and fixed to the insertion hole of the metal support plate. It is a heater for generating hot air, characterized in that it is inserted and supported in a state where there is no air.

  According to a second aspect of the present invention, in the first aspect of the invention, a plurality of the block-like insulators are arranged in parallel in the front-rear direction and the cross-sectional direction in the metal cartridge of the heating unit. It is a heater.

  According to a third aspect of the present invention, there is provided the hot air generating heater according to the first or second aspect, wherein two or more heating portions are arranged in the front-rear direction.

  According to a fourth aspect of the present invention, in each of the first to third aspects of the invention, high-temperature hot air can be used as the supply gas, and the high-temperature hot air is supplied from the supply port, and the supply port is connected to one end. A side surface portion of the cylindrical body that is formed from a cylindrical body having a bottomed cylindrical shape with an open portion, the opening at the one end being a supply port, and a direction substantially perpendicular to the direction in which hot air is supplied from the supply port A plurality of through holes are provided, and the cylindrical body is inserted from the side surface portion on the base end side of the main body portion, and inserted between the electrode rods disposed above and below the heating portion inside. This is a heater for generating hot air.

  According to a fifth aspect of the present invention, in each of the first to fourth aspects of the present invention, a metal support plate that supports the heating unit is a substantially circular plate in front view, and the heating unit is supported by the metal support. It is arranged in a cylindrical heating part holding pipe through a plate, and this heating part holding pipe is supported in the main body part, between the side surface part of the heating part holding pipe and the inner wall part of the main body part, and A heater for generating hot air, wherein a heat insulating member is disposed between a rear side of a cylindrical body of a supply port and the power distribution unit.

  According to a sixth aspect of the present invention, in each of the above-described inventions, a plurality of temperature sensor through holes are formed at appropriate positions on the insulator where the heating wire is disposed, and the temperature sensor is inserted into the temperature sensor through hole. The terminal is provided in the power distribution unit, and can measure at least the supply hot air temperature, the temperature in each heating unit, and the temperature in the discharge port.

  A seventh aspect of the present invention is the above-described invention, wherein, in each of the above inventions, a plurality of protrusions supporting the heating wire are provided in the gas flow direction on the inner wall of the gas circulation hole of each insulator where the heating wire is disposed, It is a heater for generating hot air, characterized in that a wound heating wire can be supported in a gas flow hole while maintaining a distance from its inner wall.

In the first one of the present invention, the heating part is composed of a plurality of block-like insulators arranged in parallel in a box-shaped metal cartridge. The capacity can be increased, and the capacity can be further increased by disposing two or more.
Since the plurality of electrode rods are arranged above and below the heating unit, the supply port portion can be arranged from the lateral direction between the upper and lower electrode rods on the base end side of the main body unit. .
Since the electrode rod is provided up to the power distribution unit provided outside the base end of the main body, the power distribution unit is located outside the base end of the main body, which is convenient for wiring. Thus, since the heat distribution member is interposed between the power distribution unit and the inside of the main body, it is well blocked from the high heat part inside the main body.

Since the power distribution unit is provided outside the main body, it is possible to easily provide a cooling fan in the power distribution unit.
The plurality of electrode rods are inserted and supported by a metal support plate that supports a heating unit made of a metal cartridge, and the electrode rods are insulated from the insertion holes of the metal support plate and inserted in an unfixed state. Since it is supported, the electrode rod also repeats thermal expansion and contraction following the repeated thermal expansion and contraction of the metal cartridge as the heating unit, but both are not fixed separately. , Each of them expands and contracts independently and does not cause any trouble.

  In the second aspect of the present invention, the insulator disposed in the metal cartridge as the heating portion is specified, that is, the block-like insulator is disposed in the front-rear direction in the metal cartridge of the heating portion. In addition, it is specified that a plurality are arranged in parallel in the cross-sectional direction. Thereby, the capacity | capacitance of one heating part can be determined as needed suitably.

  In the third aspect of the present invention, it is specified that two or more heating units are arranged in the front-rear direction. In the present invention, a plurality of heating units are arranged in series in the front-rear direction in this way. The capacity can be easily increased in steps as needed.

In the fourth aspect of the present invention, high-temperature hot air can be used as the supply gas, and the configuration and position of the supply port portion according to the present invention are limited.
That is, the supply port is formed from a cylindrical body having a bottomed cylindrical shape with one end opened, and the opening at the one end is used as a supply port, and is substantially perpendicular to the direction in which hot air is supplied from the supply port. A plurality of through holes are provided in the side surface portion of the cylindrical body in the direction, the cylindrical body is inserted from the side surface portion on the proximal end side of the main body portion, and a plurality of the above-described heating units disposed above and below the heating unit It is configured and specified so that it can be inserted and arranged between the electrode bars from the lateral direction.
The discharge port portion having the above-described configuration has a form of a single air blowing nozzle, which is unitized so that it can be easily assembled to the main body portion.

  In the fifth aspect of the present invention, the heat insulating material is additionally limited, and a metal support plate that supports the heating portion is a substantially circular plate in front view, and the heating portion is made of the metal. It is arranged in a cylindrical heating part holding pipe via a support plate, and this heating part holding pipe is supported in the main body part, thereby, between the side part of the heating part holding pipe and the inner wall part of the main body part. And it has specified that the heat insulation member was arrange | positioned between the back side of the cylindrical body of the said supply port, and the said power distribution part.

  In the sixth aspect of the present invention, the temperature sensor is specified, and a plurality of temperature sensor through holes are formed at appropriate positions of the insulator where the heating wire is disposed, and the temperature sensor through holes are formed in the temperature sensor through holes. A temperature sensor was inserted, and its terminal was provided in the power distribution unit, so that at least the supply hot air temperature, the temperature in each heating unit, and the temperature in the discharge port could be measured.

  In the seventh aspect of the present invention, the gas flow holes of the insulator to be used are further limited, and the heating wires are supported on the inner walls of the gas circulation holes of each insulator where the heating wires are disposed. A plurality of protrusions are provided in the gas flow direction so that the wound heating wire can be supported in the gas flow hole while maintaining a space between the inner wall and the flow gas appropriately on the inside and outside of the heating wire. A configuration that distributes and improves heat exchange efficiency was adopted.

1st Embodiment of the heater for hot air generation | occurrence | production of this invention is shown, The (A) is a perspective plane conceptual diagram, The (B) is a perspective side surface conceptual diagram. It is a see-through | perspective back view except the power distribution part of the said 1st Embodiment. It is a plane perspective conceptual diagram of the said 1st Embodiment, Comprising: The heat insulation member is shown. It is a see-through | perspective side surface conceptual diagram which illustrates 2nd Embodiment of this invention. It is explanatory drawing of the heater cartridge and electrode bar part of the heater for hot air generation concerning the said 2nd Embodiment, Comprising: In order to make an insulator part easy to see, it rotated 90 degree | times and is shown in figure. Although it is the principal part enlarged view of FIG. 5, it is the figure which looked upwards from the inner side, and has not rotated 90 degree | times. Although it is a perspective view of the insulator used in the said 1st and 2nd embodiment, it showed to the state rotated 90 degree | times similarly to the said FIG. It is a perspective explanatory view of the conventional insulator. FIG. 9 is a conceptual explanatory view showing a conventional hot air generating heater in which the insulator shown in FIG. 8 is arranged.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1A and 1B show a first embodiment of a heater for generating hot air according to the present invention, in which FIG. 1A is a perspective plan conceptual diagram and FIG. 1B is a perspective side conceptual diagram.

  A heater 10 for generating hot air according to the present invention includes a substantially cylindrical body chamber 11 as a body part, a substantially cylindrical heating part holding pipe 12 disposed therein, and an inside of the heating part holding pipe 12. The heater cartridge 13 as a substantially prismatic heating unit to be held, a supply port unit 14 for supplying gas, a discharge port unit 15 for discharging heated gas from the discharge port 15t, and wiring are not shown. , And a power distribution section 16 serving as a terminal section on which terminals of electrodes and thermocouples are disposed.

The heater cartridge 13 is made of a box-shaped metal having both ends open, and a plurality of block-shaped square lotus insulators are arranged in parallel in the front-rear direction and the cross-sectional direction.
These square-shaped lotus root insulators will be described later with reference to FIG. 7, and are composed of a plurality of gas flow holes provided in the gas flow direction (front-rear direction). Nichrome as a heating wire is provided in the gas flow holes. Wires are routed.

A communication passage 15p that connects the front end portion of the heater cartridge 13 and the discharge port portion 15 communicates.
Although the heater cartridge 13 has a rectangular shape when viewed from the front, the heater cartridge 13 is supported in the heating portion holding pipe 12 having a substantially cylindrical shape by a metal support plate 17 having a substantially circular shape when viewed from the front.
Here, the front view means a direction viewed from the discharge port 15t.
The heating unit holding pipe 12 is similarly supported and fixed in the main body chamber 11 by a heater holding fitting 18 having a substantially circular shape when viewed from the front.
In the figure, reference numeral 30 denotes a frame for supporting the hot air generating heater 10 according to the present invention.

As will be described later with reference to FIGS. 5 and 6, inside the heater cartridge 13, four square lotus insulators are arranged in two in the cross-sectional direction, two in the vertical and horizontal directions, and nine in the front-rear direction.
The end portions of the nichrome wires wired in the gas flow holes of these insulators are not shown in the figure, but are made of a long stainless steel that is disposed six above and below the heater cartridge 13, respectively. Connected to the electrode rod 20.

The rear ends of these electrode rods 20 extend into the power distribution unit 16 provided at the rear end of the main body chamber 11, and the electrode terminals are connected to the power supply unit.
Similarly, although not shown, the thermocouple is disposed at a position where the supply gas temperature, the temperature inside the heater cartridge 13 and the temperature inside the discharge port 15 t can be measured, and each terminal is provided in the power distribution unit 16.

The gas to be supplied is supplied from the supply port 14 k of the supply port unit 14.
In the first embodiment, the supply port 14 is designed in consideration of the supply of high-temperature hot air, for example, hot air of about 600 degrees Celsius, as the supply gas.

The supply port portion 14 is made of a metal having a substantially cylindrical shape with a bottom, and the opening portion is formed with the supply port 14. The through-hole 14h which consists of this is provided, and the hot air supplied from the supply port 14 can be discharged by changing the discharge direction to the front direction and the substantially right angle direction.
The discharge port portion 14 having such a form has a form of a discharge nozzle for blowing air.

The supply port portion 14 extends from the outer portion penetrating the side surface portion of the main body chamber 11 to the inner portion to provide a heat insulating portion 14d to block heat to the outside.
The electrode rod 20 is supported by being inserted into a metal support plate 17 that supports the heater cartridge 13 and an insertion hole formed in the flange portion 11 f at the rear end of the main body chamber 11 as shown in the figure.

Since the electrode bar 20 needs to be insulated from the metal support plate 17 and the flange portion 11f of the main body chamber 11, the insertion hole is inserted and supported through a ceramic insulator.
Accordingly, the electrode rod 20 is not fixed or fixed to the metal support plate 17 and the flange portion 11f, and is movable with respect to each other.

Thereby, the expansion / contraction due to the heat of the heating portion and the expansion / contraction due to the heat of the electrode portion 20 do not interfere with each other and can be moved independently, and one strain does not affect the other.
This configuration is one major feature of the present invention.

In other words, there is no problem even if the expansion / contraction due to heat of the electrode rod 20 and the expansion / contraction due to heat of the other heater cartridge 13, metal support plate 17, main body chamber 11, etc. are different from each other. Does not occur.
Thus, in this invention, the structure and structure relevant to this electrode rod become the biggest characteristics.

A power distribution unit 16 is provided at the rear end of the main body chamber 11.
As described above, the power distribution unit 16 is formed in a box shape outside the rear end of the main body chamber 11, and a large number of ventilation ports 16 h are provided on the side surfaces of the side, and although not illustrated. In addition, a cooling fan can be provided on the side surface portion.

FIG. 2 is a transparent rear view excluding the power distribution unit of the first embodiment.
As can be seen from this figure, the heater cartridge 13 is composed of a box-shaped metal cartridge having an opening at the front and rear thereof, in which insulators 24 are arranged, and four of these insulators 24 are arranged vertically and horizontally. These are arranged in nine rows in the front-rear direction.

Each insulator 24 is provided with a total of twelve gas flow holes, three vertically and four horizontally in the front-rear direction, and a nichrome wire is wired in the gas flow holes.
Six electrode rods 20 are disposed above and below the heater cartridge 13, and these electrode rods 20 are respectively supported by penetrating the metal support plate 17.
Although not shown, both ends of the nichrome wire are connected to the electrode rod 20.

FIG. 3 is a plan perspective view of the first embodiment, showing a heat insulating member.
This figure is the same as the schematic figure 1 except that a heat insulating material is provided in the hatched portion in this figure.

First, an area 11d between the inner wall of the main body chamber 11 and the outer peripheral portion of the heating part holding pipe 12, an area 16d between the main body chamber 11 and the power distribution part 16, and an area 14d where the supply port part 14 is fitted into the main body chamber 11. A heat insulating material is disposed between the discharge port portion 15 and the main body chamber 11, the area 15 d, the front end portion of the heater cartridge 13, the outer periphery of the communication passage 15 p, and the heating portion holding pipe 12.
As described above, the space and the heat insulating material are appropriately and sufficiently disposed around the area where the high temperature hot air is generated to block high heat to the outside.
The capacity of the heater for generating hot air according to the first embodiment is 24 kW.

FIG. 4 is a perspective side view illustrating the second embodiment of the present invention, wherein the capacity of the heater according to the first embodiment is doubled.
In the present invention, the capacity can be increased stepwise by further adding a heater cartridge which is one of the constituent members.

In the second embodiment, the capacity is doubled to 48 kW.
As can be easily understood from the drawing, the heater cartridge 23 is added in series in the flow direction of the flow gas, that is, the front-rear direction.
Accordingly, the electrode rod 20 is naturally longer than that of the first embodiment.
Other configurations are the same as those of the first embodiment.

As described above, in the present invention, only by adding the heater cartridge 23 which is a part of the constituent elements, that is, the same one constituent member can be additionally used and the capacity can be increased. is there.
Note that the insulators disposed in the heater cartridge 23 can be appropriately disposed in the front-rear direction, such as 6 to 10 rows, as necessary.

FIG. 5 is an explanatory diagram of the heater cartridge and electrode rod portions of the hot air generating heater according to the second embodiment, and is shown rotated 90 degrees to the left so that the insulator portion can be easily seen.
FIG. 6 is also an enlarged view of the main part of FIG. 5 as viewed from the inside, and is not rotated by 90 degrees.

From these figures, the form of the end surface portion of the heater cartridge 23 and the relationship between the electrode rods 20 can be specifically seen.
As described above, since FIG. 5 is rotated 90 degrees counterclockwise, the left side is upward.
Four insulators 24 are arranged two by two in the cross-sectional direction, and in this embodiment, seven rows are arranged in the front-rear direction. This arrangement number can be changed by the watt density (W / cm ² ) of the heater. Nine rows are arranged in the high temperature portion of the front heater cartridge 13 as described above.

  As described above, the number of the insulators arranged in the front-rear direction in the heater cartridge 23 and the heater cartridge 13 can be determined by a predetermined set discharge temperature of the heated gas. However, the watt density, the heat exchange efficiency, and the like are taken into consideration. In addition, the heater capacity can be scaled up step by step by arranging the heating parts in a plurality of blocks and increasing the arrangement of the insulators in the front heating part.

Each insulator 24 is referred to as a so-called square-shaped lotus root insulator, and a total of 12 through-holes of 4 horizontal and 3 vertical are provided in the front-rear direction, and these through-holes are referred to as gas flow holes 24 h. Become.
Nichrome wires 25 are wired in the respective gas flow holes 24 h and both ends thereof are connected to the electrode rod 20.

  In this embodiment, since 48 gas flow holes 24h are arranged in the front-rear direction, the nichrome wires 25 are wired in a zigzag manner using four gas flow holes 24h in the front-rear direction, so that in total Twelve nichrome wires 25 are used, so twelve electrode bars 20 are required.

Therefore, the number of the electrode rods 20 can be appropriately changed according to the number of gas flow holes 24h (that is, nichrome wires) of the insulator 24 and the wiring method.
In FIG. 6, both end portions 25 t and 25 t of the nichrome wire 25 are connected to the electrode rod 20.

FIG. 7 is a perspective view of the insulator used in the first and second embodiments, and shows a state in which it is rotated by 90 degrees as in FIG.
Thus, the insulator 24 used in the present invention is composed of a plate-shaped body having a substantially rectangular parallelepiped shape, and is composed of 12 gas flow holes 24h arranged in the front-rear direction.

Each of the gas flow holes 24h has a substantially quadrangular shape in a front view with curved corner portions, and each of the four inner walls has protrusions formed in the gas flow direction, and the nichrome wire 25 disposed therein is provided. It is the structure which can support and can support the said inner wall at predetermined intervals.
In this figure, three are stacked in close contact in the front-rear direction, but in actuality, in the first and second embodiments, they are arranged in parallel at a predetermined interval. Considering thermal efficiency.

  In the first and second embodiments, two insulators 24 are arranged vertically and horizontally in the cross-sectional direction, and these are arranged in nine or seven rows in the front-rear direction, and these are arranged in parallel inside the metal cartridge and fixed. As a result, a heater cartridge is formed.

Although the embodiment of the present invention has been described above, various design changes can be made in the present invention as follows.
In the above embodiment, the heater capacities of 24 kW and 48 kW are disclosed, but by arranging a plurality of heater cartridges as one of the constituent elements, a 72 kW one can also be manufactured. By further increasing the capacity of the heater cartridge, which is a component, for example, it can be expanded to 50 kW, 100 kW, and 150 kW, and the capacity can be easily scaled up step by step.

The size of the main chamber can also be appropriately changed according to the capacity.
In the above embodiment, the electrode rod is also made of a stainless steel rod. However, the vertical and horizontal sizes and the length of the cross section can be appropriately set as necessary.

The metal cartridge of the heater cartridge can also be made into a box shape with both ends opened by combining those having a substantially U-shaped cross section.
The diameter, thickness, and number of metal support plates that support the heater cartridge can be appropriately changed in design.
The outer diameter of the heating part holding pipe can also be set as appropriate, and the outer diameter and thickness of the heater holding fitting that supports the heating part holding pipe can also be set as appropriate.

As described above, a plurality of insulators are arranged in parallel in the cross-sectional direction and the front-rear direction in the heater cartridge. However, it is preferable to arrange these insulators in the front-rear direction with appropriate intervals. .
In this regard, the features of the invention described in Patent Document 2 previously proposed by the applicant of the present application can be used.

  As described above, in the present invention, a heater cartridge having a desired capacity can be provided by unitizing and arranging a plurality of heater cartridges constituting the heating unit, and using a plurality of electrode rods in that case. Therefore, there is no interference between the expansion and contraction due to the heat of each component constituting the main body and the expansion and contraction due to the expansion and contraction due to the heat of the electrode rod, and hot air generation that does not cause any trouble due to the movement due to the expansion and contraction. Heaters could be provided.

DESCRIPTION OF SYMBOLS 10, 40 Hot air generating heater 11 Main body chamber 12 Heating part holding pipe 13, 23 Heater cartridge 14 Supply port part 14h Supply port 15 Discharge port part 15t Discharge port 16 Power distribution part 17 Metal support plate 18 Heater holding metal fitting 20 Electrode rod 24 Insulator 24h Gas flow hole 25 Nichrome wire 30 Mounting base

Claims (7)

A gas supply port is provided on the base end side, and a heating part is provided inside the main body part provided with a discharge port at the distal end part. An insulator is provided in the heating part, and a large number are provided in the longitudinal direction of the insulator. Hot air that can heat the supply gas supplied from an air blower or the like through the supply port through the gas flow hole, and can discharge high-temperature hot air from the discharge port. In the heater for generation,
The heating unit is composed of a box-shaped metal cartridge that is open at the front and back, and a plurality of block-shaped insulators are arranged in parallel inside the heater, and an electric current is provided in a gas flow hole provided in the front-rear direction of these insulators. A heating wire is arranged, and terminals of each heating wire are connected to a plurality of electrode bars arranged on the upper and lower parts of the metal cartridge of the heating unit,
These electrode rods are supported by being inserted through insertion holes of a metal support plate that supports the heating unit within the main body, and the base ends of these electrode rods are respectively provided outside the base end of the main body. Up to the department,
The power distribution unit is provided at the base end of the main body through a heating unit and a heat insulating member in the main body,
A heater for generating hot air, wherein the electrode rod is inserted and supported in a state where it is insulated from and fixed to the insertion hole of the metal support plate.   The heater for generating hot air according to claim 1, wherein a plurality of the block-like insulators are arranged in parallel in the front-rear direction and the cross-sectional direction in the metal cartridge of the heating unit.   The heater for generating hot air according to claim 1 or 2, wherein two or more heating units are arranged in the front-rear direction. High-temperature hot air can be used as the supply gas, and this high-temperature hot air is supplied from the supply port.
The supply port is formed from a cylindrical body having a bottomed cylindrical shape with one end opened, and the opening at the one end is used as a supply port, and a direction substantially perpendicular to the direction in which hot air is supplied from the supply port. A number of through holes are provided in the side surface of the cylindrical body,
The cylindrical body can be inserted from the side surface portion on the base end side of the main body portion and inserted between the electrode rods disposed above and below the heating portion inside. The heater for hot air generation | occurrence | production of any one of thru | or 3. Using a substantially circular front view as a metal support plate for supporting the heating unit,
This heating unit is disposed in a cylindrical heating unit holding pipe via the metal support plate,
Support this heating part holding pipe in the main body part,
A heat insulating member is disposed between a side surface portion of the heating portion holding pipe and an inner wall portion of the main body portion, and between a rear side of the cylindrical body of the supply port and the power distribution portion. Item 5. The hot air generating heater according to any one of Items 1 to 4.   A plurality of temperature sensor through holes are formed at appropriate positions on the insulator where the heating wires are disposed, and the temperature sensors are inserted into the temperature sensor through holes, and terminals thereof are provided in the power distribution unit, at least the supply hot air temperature, The heater for generating hot air according to any one of claims 1 to 5, wherein the temperature in each heating section and the temperature in the discharge port can be measured.   On the inner wall of the gas flow hole of each insulator where the heating wire is disposed, a plurality of protrusions supporting the heating wire are provided in the gas flow direction, and the wound heating wire is connected to the inner wall in the gas flow hole. The heater for generating hot air according to any one of claims 1 to 6, wherein the heater can be supported while maintaining an interval.