JP2022011238A - Heater for generating warm air and insulator thereof - Google Patents

Abstract

To improve a structure of an insulator, increase a heater capacity using the insulator, and solve various problems generated upon discharging continuous high-temperature warm air.SOLUTION: A plurality of ridge parts 13 are provided on an inner wall surface of a gas flow hole 12 of an insulator 1, and a heating wire 20 can be supported in a plane by the ridge parts 13. The insulators 1 are arranged substantially in parallel in an air flow direction while maintaining a predetermined interval. The plurality of gas flow holes 12 provided in the insulator 1 are aligned in vertical and horizontal directions, and the entire aligned gas flow holes 12 are provided so as to be deflected in the vertical direction. When the insulators 1 are arranged at the interval in the gas flow direction, the adjacent insulators 1 are arranged in a state of being rotated by 180 degrees. Consequently, the heating wire 20 is vertically deflected and wired between the respective insulators 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heater for generating hot air capable of continuously discharging high-temperature hot air at about 1100 ° C. by connecting to a blower or the like, and an improvement of an insulator used therefor.

Conventional heaters for generating hot air of this type and insulators used in the heaters are shown in FIGS. 6 and 7 attached. FIG. 6 is a perspective explanatory view of the insulator, and FIG. 7 is a conceptual explanatory view of the heater for generating hot air.
The insulator 50 shown in FIG. 6 is a so-called spiral insulator having a cylindrical shape, and a large number of gas flow holes 52, 52, ... Are provided in the axial direction thereof, and resistance is provided to each of the gas flow holes 52. A spirally wound heating wire made of a heated alloy is wired.

The blown gas flows in the axial direction (gas flow direction) D, passes through each of the gas flow holes 52, and is heated. The inner wall surface of each gas flow hole 52 is not provided with a ridge or a protrusion for supporting the heating wire.
An appropriate number of the insulators 50 are arranged in the axial direction, the positions of the respective gas flow holes 52 are matched and overlapped, and the insulators 50 are arranged in the heater for generating hot air.

FIG. 7 shows a heater 60 for generating hot air in which the insulator 50 is arranged inside.
Four insulators 50 are arranged in series in the axial direction (gas flow direction D) inside the heater accommodating body 65 having the gas supply port 61 on the right end side in the figure and the hot air discharge port 62 on the left end side in the figure. And fixed.

The number of insulators 50 to be arranged is appropriately determined according to the capacity of the heater. When arranging the insulators 50, the positions of the gas flow holes 52 are arranged at the same position. Then, as shown by the alternate long and short dash line in the figure, a heating wire is wired from the side of the supply port 61 toward the discharge port 62 in these gas flow holes 52, and then from the side of the discharge port 62 to the supply port 61. Wire in a zigzag pattern toward the side. By setting the number of gas flow holes 52 of the insulator 50 to an even number, both terminals of the heating wire can be arranged on the supply port side.

Each insulator 50 is fixed by a long shaft bolt 66 and a nut 67. These bolts and nuts are fixed by using 2 to 4 points of any gas flow hole 52 provided in the insulator 50.
Although not shown, a temperature sensor such as a heat transfer pair for preventing abnormal overheating can be arranged in any gas flow hole 52 located in the central portion. In this case, it is inserted and arranged in the central portion of the spirally wound heating wire.
The discharge temperature sensing sensor T for detecting the discharge temperature is arranged from the outside of the heater storage body 65 in front of the insulator located on the most discharge port side in the heater storage body 65.

The problems of the above conventional example are listed below.
The heating wire wired to the porcelain stretches in the direction in which the force is applied due to a rapid increase in the blowing gas (change in the wind speed passing through the gas flow hole) or gravity (electricity wound in a spiral shape). The distance (pitch) between adjacent lines of heat rays is uneven), and the amount of air passing through each gas flow hole changes due to abnormal overheating due to this), so high-temperature hot air should be discharged safely for a long period of time. I can't.

When high-temperature hot air of 800 ° C. or higher is discharged, the surface temperature of the heating wire becomes about 900 ° C. or higher, but a phenomenon occurs in which the heating wire extends toward the outlet side of the insulator due to the wind pressure of the blower gas.
This problem of elongation of the heating wire generates a magnetic field when a current is passed through the heating wire, and may be promoted by the vibration of the heating wire due to this magnetic field.

The vibration of the heating wire is generated not only by the magnetic field but also by the mechanical vibration, but the generation of such vibration causes frictional contact between the heating wire and the gas flow hole, and the oxide film of the heating wire is scraped (polished). Alternatively, the inner wall surface of the porcelain is polished, and it becomes dust and jumps out to the outside, adversely affecting the environment, and if it accumulates in the gas flow hole, it may cause disconnection of the heating wire.
The insulator does not hold the heating wire sufficiently, and it is vulnerable to mechanical vibration or magnetic field vibration. Since the heating wire is only inserted through the gas flow hole of the insulator and wired, the heating wire is not held by the insulator.

In order to solve the above problems, the inventor of the present application has previously proposed the invention described in Patent Document 1 below.
In the invention described in Patent Document 1 below, by devising a combination of a porcelain and a heating wire, high-temperature hot air of about 800 ° C. to 1000 ° C. can be continuously discharged even if the porcelain itself does not hold the heating wire. The challenge is to provide a heater for generating hot air, and to further reduce its weight, resources, compactness, and cost, and to improve its performance compared to conventional heaters, that is, its performance. The problem was to improve the efficiency of heat exchange to the blown gas and to obtain a continuous discharge gas temperature higher than that of the conventional one.

The configuration is such that a gas supply port is provided at one end and a porcelain is provided inside a substantially tubular heater housing with a discharge port at the other end, and a large number of gas flow holes provided in the porcelain are provided. Is a heater for generating hot air, which is composed of a heating wire and is heated by circulating the blown gas supplied from a blower or the like through the supply port to the gas flow hole of the insulator and discharging the high temperature hot air from the discharge port. In insulators are formed from a plurality of disc-shaped insulators having a predetermined thickness, gas flow holes are provided in the axial direction thereof, and these plurality of insulators are arranged one by one in a row in the blowing direction at intervals of substantially parallel. However, it was a heater for generating hot air, characterized in that the interval was set to a distance of about 1/2 to about 2 of the thickness of the insulator.

Here, to briefly explain the heating element (heating wire) and its life, an austenitic resistance alloy is generally used when heating air. Various types of heating elements are sold by each manufacturer, but among them, the materials sold for industrial use specify the maximum continuous operating temperature of the heating element as a harsh usage condition.

However, it is often difficult to predict the life of the insulator with respect to the temperature, and this includes various factors such as the support method of the insulator, fluctuations in the ambient temperature, and temperature changes and vibrations of the insulator due to voltage on / off. The electrical insulation value of the insulator and the high-quality fire-resistant insulator (including 40% or more of alumina type) have an influence, and if you select and design without understanding these, all of them will shorten the life of the heating element. ..

In addition, the heating element (resistance heating alloy) forms an oxide film on the surface, and the film helps to extend the life of the heating element, but the film is thin and blows air through the gas flow holes of the insulator. It is also necessary to prevent it from peeling off due to vibration caused by air.

It is also necessary to be careful that the heating element inserted into the gas flow hole of the insulator does not come into point contact with the insulator. When point contact occurs, rubbing that exceeds the wear limit occurs, the oxide film wears or disappears in that part, and the surface of the heating element is also scraped off, the electrical resistance value of that part changes, and the life is greatly adversely affected. Will be given.

As described above, from the viewpoint of the life of the heating element, the heating element and the insulator have a very close relationship, and it is necessary to consider the configuration and structure of the insulator and the heater for generating hot air while considering this. There will be.

Japanese Unexamined Patent Publication No. 2012-57892

Therefore, in the present invention, not only the relatively small heater for generating high temperature hot air as in the above-mentioned conventional example, but also the high temperature hot air (from 500 ° C.) that can be easily upgraded from the one having a small capacity to the one having a larger capacity. It is also an object to provide a heater for generating hot air and an insulator thereof capable of continuously discharging (about 1100 ° C.), and to solve various problems of the conventional heater for generating hot air and an insulator.
In reality, high-temperature hot air can be discharged at about 1300 ° C., but in the present application, the purpose is to discharge hot air in the above temperature range.

In order to solve the above problems, in the first method of the present invention, a plurality of insulators are arranged in a housing, and a spirally wound heating wire is inserted into a plurality of gas flow holes provided in the insulators. In a heater for generating hot air that can supply air from the supply port of the housing and discharge high-temperature hot air from the discharge port, a plurality of heaters for generating high-temperature air are formed on the inner wall surface of each gas flow hole of the insulator in the air flow direction. A ridge portion is provided, and the heating element can be supported by the ridge portion, and air also circulates in the groove portion between these ridge portions to allow air to flow to the outer peripheral portion and the inner circumference of the heating wire. The support surface that can absorb heat from the portion and supports the heating element of the protrusion portion is formed in a plane, and these insulators are arranged substantially in parallel in the air flow direction while maintaining a predetermined interval. Further, a plurality of gas flow holes provided in the insulator are aligned in the vertical and horizontal directions, and the entire aligned gas flow holes are provided by being deflected in either the vertical direction or the horizontal direction, and these insulators are provided. It is a heater for generating hot air, characterized in that adjacent insulators are arranged in a state of being rotated by 180 degrees when they are arranged in the gas flow direction.

The second aspect of the present invention is that in the first aspect of the present invention, the insulator has an outer shape having a substantially rectangular shape when viewed from the front, and the number of gas flow holes provided is even, and the terminal of the heating wire is provided at one end. It is a heater for generating hot air, which can be arranged on the side and the distance between each insulator is in the range of about 20 mm to about 80 mm.

The third aspect of the present invention is the heater for generating hot air, characterized in that, in the second aspect of the present invention, the entire plurality of gas flow holes provided in the porcelain are deflected by about 8 mm in the vertical direction or the horizontal direction. Is.

The fourth aspect of the present invention is that, in the second or third invention, a plurality of the insulators can be overlapped and fixed in the vertical direction and / or the horizontal direction in the front view, and the capacity of the heater can be changed. It is a heater for generating hot air.

A fifth aspect of the present invention is for generating hot air, which is characterized in that, in the first to fourth inventions, the inlet and outlet edges of the gas flow hole are chamfered to form a rounded shape. It is a heater.

The sixth aspect of the present invention is that, in each of the above inventions, a hole for inserting a temperature sensor is provided substantially parallel to the gas flow hole in a portion surrounded by a plurality of gas flow holes provided in the porcelain. It is a heater for generating hot air, which is characterized by.

The seventh aspect of the present invention is the insulator of the hot air generating heater used for the hot air generating heater according to the first to sixth inventions.

In the first aspect of the present invention, the heating wire is supported by a ridge portion provided on the inner wall surface of the gas flow hole, and the support surface of the ridge portion is flat, so that it is a point contact or a wire. It is possible to prevent wear of the oxide film on the surface of the heating wire because of the support by the surface instead of the support by contact.
In addition, due to the presence of the grooves between the ridges, the supplied gas also circulates in the grooves, absorbs heat from the outer and inner circumferences of the heating wire, and accumulates in the ridges of the insulator. It will also be able to absorb the heat generated.

Since there is a predetermined interval between the insulators arranged in the gas flow direction, the blown gas heated in the gas flow hole of each insulator is once mixed and mixed between the insulators.
By mixing and mixing the blown gas between the insulators, the temperature unevenness (temperature difference) in each gas flow hole of the blown gas is eliminated, and a constant temperature rise is realized. This will be repeated in the space between each insulator, and as a result, the efficiency of heat exchange to the blown gas will be further improved.
Further, the amount of air passing through each gas flow hole can be made to be substantially the same depending on the distance between the insulators, and the heat conversion efficiency from the heating wire to the blown gas can be further improved.

Then, in the present invention, a plurality of gas flow holes provided in the porcelain are arranged in the vertical and horizontal directions, and the entire aligned gas flow holes are provided by being deflected in either the vertical direction or the horizontal direction. When arranging these porcelain in the gas flow direction, the adjacent porcelains are arranged in a state of being rotated by 180 degrees. That is, the entire gas flow hole was provided so as to be biased in one direction, and these insulators were sequentially arranged one by one by turning them upside down or left and right.

As a result, the heating wire inserted through the gas flow hole is loaded by lowering or rising (or zigzag to the left or right) by the deflected distance.
The reason for adopting such a configuration is that when the temperature rises, the mechanical strength of the alloy material of the heating wire decreases, and when an AC voltage is applied to it, on / off temperature changes and micro-vibrations occur, and the air heats with the heating element. By forcibly blowing air having a wind speed of 10 to 50 m / sec (depending on the model) into the gas flow hole of the alloy for replacement, the heat of the heating element can be brought into close contact with the air and heated.

In the final insulator on the discharge port side, it is known that the temperature of the heating wire is around 1050 ° C. when the discharge hot air temperature reaches 1000 ° C.
By repeating the heating wire going down and up (or zigzag to the left and right) by the deflection distance, and by opening the insulators by a predetermined distance, the phenomenon of air mixing that occurs in this space is combined, and the heating element Life and continuous high temperature hot air discharge performance have been improved.

The air sent from the blower is connected to the heater for generating hot air by using a duct or the like. The blown gas circulates through multiple gas flow holes in the porcelain, but the wind speed (air volume / temperature) passing through each gas flow hole is not always constant, and especially when the balance is lost, it passes through a certain gas flow hole. The hot air generated may have a temperature difference of 700 ° C. and the others may have a temperature difference of 660 ° C. At this time, the blown gas is mixed and becomes uniform in the next space between the insulators. By repeating this two or three times or more, the temperature (air volume / speed) in all the gas flow holes becomes almost completely the same.

The metal of the heating wire softens as the temperature rises. In addition, it becomes easy to vibrate due to various causes.
If the heating wire is linearly inserted into the gas flow holes of several insulators, the high-temperature heating wire gradually pops out in the direction pushed by the flow velocity of the air.
Further, when the heating element is inserted in a straight line, vertical vibration (resonant vibration) is generated with a slight trigger during ventilation. Especially at high temperatures, slackening of the heating element coil also occurs between the insulators.

However, by loading the heating wire consisting of the heating element coil so that it goes up and down (or zigzag to the left and right), the heating element becomes the support part of the insulator in the gas flow hole of the insulator. The anti-slip effect of the heating element can be expected in the part, and the naturally occurring vertical vibration (resonance) is extremely reduced.
The effect of the gas flow hole is that the gas flow hole of the next porcelain and its center are deviated by the deflection distance (up and down or left and right), and a turbulent space with an appropriate wind velocity is created in the blown gas flowing there, and there are multiple gas flow holes. It also has the effect of making the uneven flow velocity out of the gas flow hole uniform.

In the second aspect of the present invention, the insulator has an outer shape having a substantially rectangular shape in front view, and the terminals of the heating wire can be arranged on one end side with an even number of a plurality of gas flow holes provided. The distance between the insulators is set in the range of about 20 mm to about 80 mm, and the distance between the insulators on the discharge port side is smaller than the distance between the insulators on the supply port side.
This is a more concrete structure of the relationship between the insulator and the heating wire in the heater for generating hot air.

In the third aspect of the present invention, the entire plurality of gas flow holes provided in the porcelain are deflected by about 8 mm in the vertical direction or the horizontal direction, and the deflection distance is limited to an appropriate range. Is.

In the fourth aspect of the present invention, it is specified that the capacity of the heater can be easily changed by superimposing and fixing a plurality of the insulators in the vertical direction and / or the horizontal direction in the front view. be.

In the fifth aspect of the present invention, the opening edges of the inlet and outlet of the gas flow hole are chamfered to form a rounded shape, whereby the pressure loss in the gas flow hole is limited. Was reduced by about 6%, and the passing air volume could be increased.

In the sixth aspect of the present invention, it is specified that a hole for inserting a temperature sensor is provided substantially parallel to the gas flow hole in a portion surrounded by a plurality of gas flow holes provided in the porcelain. It is specified that the location of the temperature sensor such as the thermocouple is provided separately from the gas insertion hole.
This makes it possible to measure the temperature at a desired position.

The seventh aspect of the present invention specifies the insulator used for the heater for generating hot air according to each of the above inventions, and claims the right of the insulator itself.

An embodiment of an insulator used for a heater for generating hot air according to the present invention is shown, in which (A) is a plan view, (B) is a front view, and (C) is a side view. The gas flow hole portion of the insulator according to the above embodiment is enlarged and shown, (A) is a front explanatory view and (B) is a cross-sectional explanatory view. The state in which the insulators according to the above embodiment are arranged in the heater for generating hot air is conceptually shown, in which (A) is a front explanatory view seen from the discharge port side, (B) is a side explanatory view, and ( C) is a rear explanatory view seen from the supply port side. The wiring state between the insulator and the heating wire according to the above embodiment is conceptually shown, (A) shows the front explanatory view seen from the discharge port side, and (B) shows the insertion state of the insulator and the heating wire. A plan view, (C) is a side view, (D) is a front view as seen from the discharge port side, and (E) is a side view showing the insertion state of the insulator and the heating wire after the insertion is completed. Is. Another embodiment of the heater for generating hot air of the present invention is conceptually illustrated, in which (A) is a rear view from the supply port side and (B) is a side view. It is a perspective view explanatory view of the conventional insulator. FIG. 6 is a conceptual explanatory view showing a conventional heater for generating hot air in which the insulator shown in FIG. 6 is arranged inside.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an embodiment of an insulator used in a heater for generating hot air according to the present invention, in which (A) is a plan view, (B) is a front view, and (C) is a side view. ..
2A and 2B show an enlarged view of a gas flow hole portion of an insulator according to the above embodiment, in which FIG. 2A is a front explanatory view and FIG. 2B is a cross-sectional explanatory view.

The insulator 1 according to the present invention has a substantially rectangular shape when viewed from the front, and has recesses 11 and 11 for fixing in the vertical direction on both sides thereof, and the material thereof is made of ceramics such as Kojilite. ..
In the front and back directions (gas flow direction) of the insulator 1, three gas flow holes 12 through which blown gas flows are provided vertically and four horizontally, for a total of twelve, arranged vertically and horizontally.

The number of the gas flow holes 12 can be freely set vertically and horizontally, but an even number is provided. This is because the terminal of the heating wire to be inserted into the gas flow hole 12 is arranged at one end.
As can be seen from FIG. 2, on the inner wall surface of the gas flow hole 12, eight ridges 13 are provided in the gas flow direction at the same intervals in the circumferential direction, and between these ridges 13 are provided. Eight groove portions 14 are also formed like small holes.

The support surface on which these ridges 13 support the heating wire 20 is formed to be substantially flat, and is in surface contact with the heating wire 20. This is to reduce the adverse effect of the vibration of the heating wire 20.
An austenitic resistance heating alloy is used as the heating wire 20.
The presence of the groove portion 14 such as the small hole between the ridge portions 13 forcibly sends the blown gas into the gas flow hole 12, and the inner peripheral portion and the outer peripheral portion of the heating wire 20. It is possible to forcibly contact with and take heat from the heating wire 20, and at the same time, take heat more effectively from the ridge portion 13 of the insulator 1.

The edges of both openings of the inlet and outlet of the gas flow hole 12 are chamfered to form a chamfered portion 12r (see FIG. 2).
In FIG. 2B, it is displayed as if chamfered in a straight line, but the actual product is chamfered in a curved shape with a radius of 1.5 mm.
Due to the presence of the chamfered portion 12, the pressure loss of the passing air volume in the gas flow hole 12 was reduced by about 6%, and the passing air volume was increased.

As described above, the heating wire 20 is wired from the gas supply port side on the back side of the paper surface to the discharge port side on the front side of the paper surface in FIG. 1B, and is made four turns to arrange both terminals on the supply port side.
In this way, it is possible to wire one wire in a horizontal row for four turns and wire three heating wires in three rows above and below, and all the terminals of these three heating wires can be arranged on the supply port side. can.

In FIG. 1B, the portions surrounded by the four gas flow holes 12 are provided with two penetrating holes 15 and 15, respectively, and a total of 12 holes are provided. The hole 15 is a hole for arranging a temperature sensor such as a thermoelectric pair, and an appropriate temperature sensor for detecting the maximum temperature, the temperature of the discharged air, or the like by using any of the holes 15. Can be arranged.

Here, the most important feature of the present invention is that the entire 12 gas flow holes 12 arranged vertically and horizontally are provided so as to be biased downward when viewed from the front of the insulator 1. It is a point.
That is, the position where the gas flow hole 12 in the third row at the bottom is provided is located above the lower edge portion 1s of the insulator 1 by a distance d.

On the other hand, the first row of the gas flow holes 12 in the uppermost stage is arranged at a lower position by a distance of d + α from the upper edge portion 1j of the insulator 1.
That is, the entire gas flow hole 12 is deflected downward by the deflection distance α in the front view, in other words, it is provided so as to be displaced.
If the deflection distance α is appropriately about 8 mm, the effect is clearly recognized.

In this way, by deflecting the entire gas flow hole 12 downward and arranging the adjacent insulators by rotating them by 180 degrees (that is, arranging them in the opposite direction), the effects of the above invention will be described. The effect is generated.

Here, describing the actual dimensions of the insulator 1, the length of the insulator 1 is 99.5 mm, the width is 138 mm, the inner diameter of the ridge portion of the gas flow hole is 17.7 mm, and the maximum inner diameter of the groove portion is 25 mm. The deflection distance α is 8 mm.
Therefore, the protruding height of the ridge portion is about 3.65 mm. As described above, the height of the ridge portion 13 according to the actual embodiment is very high, the support surface thereof is formed in a plane, and the groove portion 14 between the ridge portions 13 has an extremely wide cross-sectional area. The blast gas also circulates in the groove portion 14.

FIG. 3 conceptually shows a state in which the insulators according to the above embodiment are arranged in the heater for generating hot air, in which (A) is a front explanatory view seen from the discharge port side, and (B) is a side surface explanation. The figure, (C) is the back explanatory view seen from the supply port side.

As can be seen from these figures, five insulators 1 are arranged substantially in parallel in the gas flow direction D, and are surrounded by the upper cartridges 2, 2, the lower cartridges 3, 3, and the left and right side cartridges 4, 4. Is surrounded and fixed by a screw or the like as a closed space (excluding the supply port and discharge port sides). The cartridges 2, 3 and 4 are filled with a heat insulating material and have a heat insulating effect. The number of insulators 1 to be arranged can be changed according to the capacity.

The cartridges 2, 3 and 4 are entirely fixed by the frame F, and are fixed in a housing (not shown).
The spacing k1 to k4 of each of the above five insulators 1 has the widest spacing on the supply port 5 side, is sequentially narrowed toward the discharge port side, and the spacing k4 on the most discharge port side is the narrowest. is doing.
Of course, the intervals can be the same.

As described above, the distance between the insulators can be changed depending on the target temperature for heating the air.
That is, since the temperature difference between the heating wire and the air is large on the low temperature side (supply port side), the distance between the insulators can be widened, and the temperature difference between the blown gas and the heating wire becomes smaller toward the discharge port side. Therefore, in order to further improve the heat exchange efficiency, it is ideal that the distance between the insulators is narrower than that on the supply port side.

Then, the adjacent insulators 1 are arranged in the opposite direction, that is, in a state of being rotated by 180 degrees.
As described with reference to FIG. 1, the entire gas flow hole 12 provided in the insulator 1 is biased downward by the deflection distance α.

Therefore, by rotating the adjacent insulators 1 by 180 degrees and arranging them, the positions of the gas flow holes 12 are different from each other up and down between the adjacent insulators 1.
By arranging the five insulators 1 as shown in FIG. 3B in this way, the heating wire (not shown) is above, below, above, below, and above (the center of the alternate long and short dash line) from the side of the supply port 5. It will be wired up and down as shown by the line.). This wiring state is shown in FIG. 4 below.

Strictly speaking, the side view shape of the insulator 1 is slightly different from that shown in FIG. 1 and that shown in FIG. 3, but its basic shape and function are exactly the same.
Further, the case where the gas flow hole 12 is deflected to the left or right is the same as the case where the gas flow hole 12 is deflected to the left or right. That is, if the form of the vertical deflection is rotated by 90 degrees, the vertical deflection occurs.

In the hot air generating heater having the above configuration, the blown gas from the blower or the like is supplied from the supply port 5 via a pipe or a duct, and is forcibly sent to a plurality of gas flow holes 12 provided in the porcelain 1. , And is discharged in the direction of arrow D from the discharge port (not shown) on the left end side in the figure.

At this time, the blown gas is mixed and mixed in the space provided between the insulators 1, the temperature of the blown gas is made uniform and the temperature is raised, and the amount of air passing through each gas flow hole is increased. It also contributes to uniformity, the heat exchange efficiency from the heating wire is improved, and the heating wire 20 inserted into each insulator 1 is wired in a state of being deflected up and down (or left and right) between each insulator 1. As a result, the problem caused by the elongation of the heating wire 20 is also solved.

FIG. 4 conceptually shows the wiring state between the insulator and the heating wire according to the above embodiment, (A) is a front explanatory view seen from the discharge port side, and (B) is the insulator and the heating wire. A plan explanatory view showing the insertion state, (C) is a side explanatory view, (D) is a front explanatory view seen from the discharge port side, and (E) is an insertion state of the insulator and the heating wire after the insertion is completed. It is a side explanatory view shown.

In these figures, seven insulators 1 are arranged at the same interval parallel to the gas flow direction.
Each insulator 1 is provided with a total of 12 gas flow holes 12 arranged in 4 × 3 in the horizontal and vertical directions, and all of the gas flow holes 12 are deflected downward by a distance α. The points are also the same as the insulator 1 according to the above embodiment.

In these insulators, the gas flow holes 12 are arranged in a straight line as shown in FIGS. 4 (B) and 4 (C), a heating wire is inserted into the insulator from the supply port side, and this is repeated for 4 turns. Both terminals are arranged on the supply port side. This is repeated 3 times in each stage to complete the insertion and wiring.
In the figure, the heating wire 20 having only one row in the middle row is shown.

After the insertion and wiring of the heating wire 20 is completed, the state shown in FIG. 4 (C) is changed to the state shown in FIG. 4 (E), that is, when the above seven insulators 1 are fixed in the cartridge, FIG. 4 (E) is obtained. As shown in the above, the heating wire 20 is inserted and wired so as to be sequentially moved up and down by the deflection distance α from the supply port side to the top, bottom, top, bottom, top, bottom, and top.
This point is the most characteristic part of the present invention, and its effect is also described in the section of the effect of the above invention.

5A and 5B conceptually illustrate another embodiment of the heater for generating hot air of the present invention, in which FIG. 5A is a rear view from the supply port side and FIG. 5B is a side view. ..
In this embodiment, four insulators 1 are arranged in parallel in the same vertical plane by a cartridge and a frame F in the housing H, and the four insulators 1 are arranged in seven rows in the gas flow direction D. ..

Therefore, the heater capacity is four times larger than that of the hot air generating heaters arranged in FIG.
As can be seen from FIG. 5, the inserted / wired heating wire 20 is in a state of being vertically displaced between each insulator 1, and the heating wire 20 can be ejected from the gas flow hole 12 and the heat exchange efficiency can be improved. It will be extremely effective.

Although the embodiments of the present invention have been described above, various design changes can be made in the present invention as follows.
First, the size of the insulator, the size of the gas flow hole, the height of the ridge portion, etc. can be appropriately designed as needed.
The outer shape of the insulator can also be appropriately redesigned according to the form of the fixing means such as a cartridge or a frame for fixing the insulator.

Further, the number of gas flow holes can be set as needed.
In the above embodiment, the insulator is fixed in the housing by using a cartridge, a frame, or the like, but the fixing method can be completely freely changed in design.

The deflection distance α that deflects the entire gas flow hole provided in the insulator downward may be about 8 mm.
The effect is recognized if the distance (distance in the gas flow direction) of the space provided between the insulators is also within the range of 20 mm to 80 mm.
It is possible to set this interval distance wide on the air supply port side and narrow on the discharge port side, and by doing so, the heat exchange efficiency can be more appropriately improved.

In the present invention, a plurality of the same insulators can be arranged and fixed in parallel and in series, and the capacity can be easily and greatly changed by increasing the number of insulators used by one insulator which is the same component. be able to.

As described above, in the present invention, the capacity can be easily deflected by using one insulator, the entire gas flow hole is deflected in one direction, the adjacent insulators are rotated 180 degrees, and the space is widened. By arranging them in the same state, the heating wire inserted in the gas flow hole can be deflected up and down or left and right for wiring, which solves the problem caused by the elongation of the heating wire heated to a high temperature and exchanges heat. It was possible to provide a heater for generating hot air and an insulator with extremely high efficiency.

1 Insulator 2 Upper cartridge 3 Lower cartridge 4 Side cartridge 5 Supply port 7 Terminal 11 Recess 12 Gas flow hole 12r Chamfer 13 Protrusion part 14 Groove part 15 Hole part 20 Heating wire α Deflection distance d Distance F frame k1, k2, k3, k4 interval

Claims (7)

Multiple insulators are arranged in the housing, a spirally wound heating wire is inserted through the multiple gas flow holes provided in these insulators, air is supplied from the supply port of the housing, and the temperature is high from the discharge port. In a heater for generating hot air that can discharge hot air,
A plurality of ridges are provided on the inner wall surface of each gas flow hole of the insulator in the air flow direction, and the heating element can be supported by the ridges, and between these ridges. By circulating air also in the groove portion, heat can be absorbed from the outer peripheral portion and the inner peripheral portion of the heating wire.
A support surface for supporting the heating element of the ridge portion is formed in a plane.
These insulators are arranged substantially in parallel in the air flow direction while maintaining a predetermined interval.
Further, a plurality of gas flow holes provided in the porcelain are arranged in the vertical and horizontal directions, and the entire aligned gas flow holes are provided by being deflected in either the vertical direction or the horizontal direction.
A heater for generating hot air, characterized in that when these insulators are arranged in the gas flow direction, the adjacent insulators are arranged in a state of being rotated by 180 degrees. The insulator has an outer shape having a substantially rectangular shape when viewed from the front, and the number of gas flow holes provided is even, and the terminals of the heating wire can be arranged on one end side, and the distance between the insulators is about 20 mm to about 80 mm. The hot air generating heater according to claim 1, wherein the distance between the insulators on the discharge port side is smaller than the distance between the insulators on the supply port side. The heater for generating hot air according to claim 2, wherein the entire plurality of gas flow holes provided in the insulator are deflected in the vertical direction or the horizontal direction by about 8 mm. The heater for generating hot air according to claim 2 or 3, wherein a plurality of the insulators are superposed and fixed in the vertical direction and / or the horizontal direction in the front view, and the capacity of the heater can be changed. The heater for generating hot air according to any one of claims 1 to 4, wherein the opening edges of the inlet and outlet of the gas flow hole are chamfered to form a rounded shape. The invention according to any one of claims 1 to 5, wherein a hole for inserting a temperature sensor is provided substantially parallel to the gas flow hole in a portion surrounded by a plurality of gas flow holes provided in the insulator. The heater for generating hot air described. The insulator of the hot air generating heater used for the hot air generating heater according to any one of claims 1 to 6.

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