WO2005078357A1

WO2005078357A1 - Heater for generating hot air and insulator for its electric heating wire

Info

Publication number: WO2005078357A1
Application number: PCT/JP2004/001660
Authority: WO
Inventors: Sadayoshi Taketsuna
Original assignee: Kabushiki Kaisha Taketsuna Seisakusho
Priority date: 2004-02-16
Filing date: 2004-02-16
Publication date: 2005-08-25
Also published as: EP1717526A1; CN100410595C; JPWO2005078357A1; CN1777779A; JP4271686B2; EP1717526A4; EP1717526B1

Abstract

A heater being connected with a blower, or the like, to deliver high-temperature hot air, and an insulator being provided in the heater. A planar insulator segment is provided with a large number of gas conduction holes (10, 10, ...) and provided, at the circumferential edge part thereof, with inserting parts (12a, 12b) for securing the insulator segment and wiring an electrode. The insulator is formed by laying a plurality of sheets of the insulator segment in the air supply direction. Positions of the gas conduction holes (10, 10, ...) of adjacent segments are shifted slightly while the sheets are laid in layers and the inserting parts (12a, 12b) for securing and wiring the electrode are arranged at an identical position. Between adjacent insulator segments where the positions of the gas conduction holes are shifted, a frame-like spacer insulator consisting only of a circumferential part where the inserting part (12c) for securing and wiring the electrode is provided at the same position as these insulator segments is arranged thus constituting a set of insulators for electric heating wire. When a nichrome wire is wired in the gas conduction hole of the set of insulators for electric heating wire, the nichrome wire is twisted by each insulator segment and held and secured surely.

Description

Technical field of heater for hot air generation and insulator for heating wire

The present invention relates to a heater connected to an air blower or the like to generate high-temperature hot air, and an insulator for supporting a heating wire such as a dichromated wire wired in the heater.

Background art

A conventional insulator and heater of this type are shown in FIGS. 10 and 11 of the accompanying drawings. FIG. 10 is a perspective explanatory view of the insulator, and FIG. 11 is a side perspective explanatory view of the heater. The insulator 50 shown in FIG. 10 is a so-called lotus root insulator having a cylindrical shape, and is provided with a large number of through holes 52, 52,. Are connected with a heating wire such as a nichrome wire.

The blown gas flows in the axial direction (gas flow direction) D, passes through the through holes 52, and is heated. No ridge or projection is provided on the inner wall surface of each through hole 52 to support the nichrome wire.

An appropriate number of the insulators 50 are arranged in the axial direction, and the positions of the through holes 52 are matched with each other, and the insulators 50 are placed in the heater for generating hot air.

FIG. 11 shows a heater 60 for generating hot air in which the insulator 50 is provided.

Inside the heater housing 65 having a gas inlet 61 at the right end in the figure and a hot air outlet 62 at the left end in the figure, there are four insulators 50 in the axial direction (gas flow direction). D) and are fixed in series. The number of the insulators 50 arranged is appropriately determined according to the capacity of the heater. When arranging the insulators 50, the positions of the through holes 52 are arranged at the same position. Then, as shown by a two-dot chain line in the figure, a nichrome wire is wired from the suction port 61 side to the discharge port 62 in these through holes 52, and then the discharge port 62 is formed. The wires are sequentially wired in a zigzag manner from the side toward the suction port 61 side. 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 suction port side. ''

Each insulator 50 is fixed by a long port 61 and a nut 67. These bolts and nuts are fixed using two to four of the 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 at the center. In this case, the wire is arranged so as to pass through the center of the spirally wound nichrome wire.

The discharge temperature sensor T for detecting the discharge temperature is provided from the outside of the heater housing 65 in front of the insulator located closest to the discharge port in the heater housing 65.

Further, the applicant of the present application has proposed in the past a device called a ring insulator described in Japanese Utility Model Laid-Open Publication No. 113470/90. Such a ring insulator is made of a cylindrical member having a short axial length, and has a through hole for passing a temperature sensor or the like at a central portion thereof, and a nichrome hole at an outer peripheral portion of the central portion. A plurality of heating wire passages for laying wires are formed by radial partition frames.

According to the desired capacity, a plurality of such ring insulators are used by overlapping them in the axial direction.However, the structure can raise the maximum gas discharge temperature to 500 ° C or more. Can not. Therefore, it cannot be used as an insulator of the heater for generating high-temperature hot air according to the present invention.

In other words, this ring insulator is of a different category from the heater insulator for generating hot air of 800 ° C. or higher according to the present invention. The reason is that in the case of a heater insulator that discharges high-temperature hot air at 800 ° C or higher, the wind speed must be at least a certain level (in order to heat the air to be heated to near the heat-resistant limit temperature of the heating wire, It is necessary to increase the heat exchange efficiency by increasing the flow rate), and the uniformity of the air volume passing through each gas flow hole is required, so that the blast gas to be heated is passed through a certain narrow space (passage) and It is necessary to make forced contact with the turned nichrome wire, but in the case of the above ring insulator, since only the dichrome wire is supported by the partition frame, it hits each heating wire. This is because it is considered that the air volume cannot be made uniform. If the wind speed cannot be kept constant, the surface temperature of the heating wire wired in each hole will be different, which will not improve the overall heat exchange efficiency and will limit the maximum discharge temperature. It is thought that.

The problems of the above conventional example are listed as follows.

The heating wire that is wired to the insulator extends in the direction in which force is applied due to a sudden increase in the blowing gas (changing the wind speed passing through the through hole) or gravity (the wire is spirally wound). The distance (pitch) between adjacent wires of the heating wire will be uneven), which will cause abnormal overheating and change the volume of air passing through each through-hole. I can't do it.

When hot air at a temperature of 800 ° C or more is discharged, the surface temperature of the heating wire becomes approximately 900 ° C or more, but the wind pressure of the blowing gas causes the heating wire to jump out of the discharge port side of the insulator. I do. In addition, when the discharge port is directed downward, gravity is also applied, and the problem of elongation and protrusion of the heating wire becomes greater. It is considered that the problem of the heating wire jumping out can be promoted by the generation of a magnetic field when a current is applied to the heating wire, and by the vibration of the heating wire caused by the magnetic field.

Vibration of the heating wire is generated not only by a magnetic field but also by mechanical vibration. However, due to the generation of strong vibration, the nichrome wire and the through hole come into frictional contact, and the oxide film of the heating wire is cut (polished). ) Or, the inner wall surface of the insulator is polished, and it jumps out as dust and has an adverse effect on the environment. If it accumulates in the through hole, it may cause a break in the heating wire.

Insufficient holding of heating wire by insulator, weak to mechanical or magnetic vibration. Since the heating wire is only passed through the through hole of the insulator, the heating wire is not held or fixed by the insulator.

Conventionally, in order to prevent the heating wire from jumping out as described above, there has been a device provided with a means for preventing jumping at the end of the insulator on the discharge port side. Even if this means for preventing protrusion is provided, the heating wire wired to the insulator passes through each hole without any means such as holding or fixing in the through hole of the insulator. Depending on the amount of air flow and heating However, it did not solve the problems caused by uneven heating wire pitch and the problems caused by vibration.

A plurality of insulators are fixed by using two or four through-holes and fastening the long axis port and nut, but the gas to be heated cannot be passed through these through-holes. , It cannot be made compact.

A temperature sensor such as a thermocouple for preventing abnormal overheating is arranged at the center of the inside of a spirally wound nichrome wire arranged in a through hole located at the center, and the through hole is formed by this temperature sensor. The flow of gas into the hole is hindered, and the heating wire in that hole has a smaller airflow than the heating wire in the other holes, and it becomes overheated more than the heating wire in other holes. Therefore, the temperature detected by the sensor always indicates a somewhat higher temperature, and perfect temperature control cannot be performed. Therefore, the maximum operating temperature must be set a little lower empirically in consideration of the safety of the heating wire.

The temperature sensor for the discharged gas is wired from the outside to the discharge port side portion of the heater housing 65, and the wiring is obstructive or does not look good.

Therefore, the present invention is directed to a heater insulator capable of discharging hot air at a temperature of 800 ° C. or higher, which does not cause uneven heating wire pitch, is resistant to vibrations due to magnetic fields and mechanical vibrations, Even if the outlet of the hot air is directed in any direction, the heating wire can be held and fixed effectively.Especially, even when it is directed downward, the heating wire can be prevented from jumping out. To improve the heat efficiency of the gas to be heated without depending on the heat exchange efficiency from the air to the gas, and to provide a stable high-temperature hot air that can be discharged over a long period of time. Its purpose is to provide a heater for generating hot air.

Although the insulator according to the present invention has been developed for discharging hot air at 800 ° C. or higher, it is needless to say that the insulator can be used for discharging hot air at a lower temperature by reducing its capacity. That is. Disclosure of the invention

In order to solve the above-mentioned problems, in a first aspect of the present invention, an insulator component (A, B) consists of a plate-like body with a number of gas flow holes (10, 10, ...) perforated, around which the component can be fixed and / or electrodes can be wired 1 or Two or more through-portions (12a, 12b) are formed, and a plurality of these insulator component pieces (A, B) can be overlapped in the blowing direction to form an insulator. Or the positions of the gas flow holes (10, 10,...) Of all or all adjacent constituent pieces are arranged in a positional relationship slightly shifted from each other, and the above-mentioned fixing and Z or electrode wiring are arranged. The through-portions (12a, 12b) can be arranged at the same position, and furthermore, in the insulators thus superimposed, the gap between the adjacent insulator components in which the positions of the gas flow holes are shifted from each other is defined as follows. A frame-like structure consisting of only the peripheral portion where the fixing and Z or electrode wiring (12c) is provided at the same position as the insulator component A set of heating insulators (G1, G2, G3) is constructed by arranging a spacer insulator (C) consisting of This is a heating wire insulator for a heater for generating hot air to which a heating wire such as a wire can be wired. In the first invention, since the positions of the gas flow holes of the adjacent insulator component pieces are slightly shifted from each other via the spacer, the heating wires to be wired are linearly wired. Instead, the wires are wired in a slightly shifted (twisted) positional relationship, and as a result, the heating wires are securely held and fixed by the two insulator component pieces. In addition, if the insulator component pieces in which the positions of the gas flow holes are slightly shifted from each other are placed directly adjacent to each other, it becomes difficult to wire the heating wire satisfactorily. This problem is solved with insulators. The inventor's most difficult task was to create the technical idea of holding and fixing each part of the wiring heating wire by shifting the position of the gas flow hole of the adjacent insulator component piece with this spacer insulator interposed. It is a point that did.

With such a configuration, the heating wire is held and fixed by each of the insulator constituent pieces, thereby preventing expansion and bending (uneven pitch) due to wind pressure and gravity, and preventing the heating wire from jumping out. Vibration and vibrations caused by magnetic fields do not have to be adversely affected.

More specifically, due to the arrangement of the spacer insulator, the gas heated in the large number of gas flow holes is mixed in the space inside the spacer insulator (the static pressure becomes constant). Even if there is a bias in heating (unevenness in pressure) in a certain gas flow hole, the gas is mixed and mixed in this space, and bias or unevenness in heating of gas can be reduced.

Then, the air flow passing through each gas flow hole can always be made the same by the spacer insulator, and the mechanical strength of the heating wire has a weak point that it decreases as the temperature rises. The pitch unevenness of the heating wire can be prevented. Furthermore, by using the spacer insulator, the position of the heating wire is slightly shifted (twisted) at that location, and the heating wire is provided with tension, thereby preventing the heating wire from jumping out due to high temperature. You can do it.

All the adverse effects of the heating wire vibration caused by the turbulent flow of the gas to be heated, and the polishing effect of the heating wire and the insulator rubbing each other, which are caused by the electromagnetic and mechanical vibrations, have been solved. That is, since the heating wire is securely held and fixed by the insulator constituent pieces because it is twisted at the spacer insulator, the heating wire and the insulator are polished by vibration compared to the conventional product. Solvable. Polishing means that the heating wire and the gas flow hole come into frictional contact due to vibration as described above, and the oxide film of the heating wire is shaved or the inner wall surface of the gas flow hole is shaved, generating dust and other adverse effects on the environment. In the worst case, if the gas is accumulated in the gas flow hole, the worst-case heating wire will be broken, but these can be prevented.

According to a second aspect of the present invention, in the first aspect, a temperature sensor is passed through one or more gas flow holes (10c) formed in a central portion of the insulator component pieces (A, B). This is an insulator for a heating wire of a heater for generating hot air, characterized by forming a space (10s) capable of being heated.

In the second invention, since the space (10s) is provided in the one or more gas flow holes (10c) located in the central portion, the temperature sensor is inserted into the space to appropriately set the desired position. It is possible to more appropriately sense and measure the maximum limit temperature (abnormal overheating temperature) of the wired -chrome wire. In the case where two or more spaces are formed, the sensor for detecting the temperature of discharged gas and the sensor for preventing abnormal overheating can be collectively arranged, for example, on the suction port side of the heater. According to a third aspect of the present invention, in the first or second aspect, a ridge (11, 11, ...) capable of supporting a heating wire is provided on an inner wall of the gas flow hole in a gas flow direction. A heating wire insulator for a heater for generating hot air, characterized in that a plurality of heating wire wires are provided so as to be supported in a gas flow hole while maintaining a distance from an inner wall thereof.

According to the third aspect of the present invention, the wound heating wire wired in the gas flow hole of the insulator is held at a fixed distance from the inner wall surface in the gas flow hole by the ridge, so The heat exchange efficiency from the hot wire to the gas to be heated is improved, and the dust and the like accumulated on the inner wall surface are not adversely affected, and the risk of disconnection is reduced.

The fourth aspect of the present invention has a gas inlet (31) that can be connected to a blower or the like via a pipe at one end, and a discharge outlet (32) that discharges hot air at the other end. A heater for generating hot air having a tubular shape, wherein one or more sets of the heating wire insulators (Gl, Gl, G2, G3) are heaters for generating hot air that can be supplied at predetermined intervals and can supply power independently to the heating wires of each set of insulators.

In the fourth aspect of the invention, a heater having a desired capacity can be formed by appropriately storing one or more sets of heating wire insulators.

When a plurality of sets of heating wire insulators are provided, power can be supplied to each of these sets independently. Since (W) can be changed, it is possible to provide a heater having a smaller volume by obtaining the same discharge temperature with the same capacity, that is, a heater having a shorter length in the gas flow direction.

In other words, the temperature of the supply gas is low at the entrance side and high at the exit side. Therefore, the appropriate surface load of the heating wire, that is, the amount of heating wire used can be changed in each set. This makes it possible to make the whole compact and contribute to energy savings without using wasteful and expensive materials.

In other words, when power is supplied, by making the surface load of the heating wire different for each set of insulators, a more appropriate shape is possible, and appropriate heating to the gas to be heated, that is, the heat resistance temperature of the heating wire Gas at a temperature close to The heat exchange efficiency is improved by the contrivance, and it becomes possible to generate gas at a temperature close to the heat-resistant temperature of the heating wire. These contrivances improve the heat exchange efficiency and contribute to energy saving.

Since a predetermined space is maintained between each pair of insulators and a fixed space is formed, the heated gas is mixed well in this space, and the heated gas is mixed with the insulator. Temperature unevenness or unevenness can be prevented.

If two or more spaces that allow the temperature sensor to pass through are used as the insulator constituent pieces, at least two temperature sensors can be provided from the suction port side. Both the discharge temperature sensor and the overheat prevention (maximum temperature) sensor can be installed from the suction port side, and the discharge temperature sensor must be provided from the outside of the discharge port side of the heater housing as in the past. Is also gone.

A fifth aspect of the present invention is a plate-like body having a large number of gas flow holes (10, 10,...) Formed therein. Insulator component (A) constituting one set of heating wire insulators (Gl, G2, G3) according to any of the first to third inventions, wherein at least two through portions (12a, 12b) are formed. , B).

According to a sixth aspect of the present invention, only one or two or more through-portions (12c) for fixing and Z or electrode wiring are formed in the peripheral portion, and the central portion is a space (14). And a frame-shaped switch disposed at one or more positions of the set of heating wire insulators (Gl, G2, G3) according to any of the first to third inventions. Insulator for heating wire, which is a ceramic insulator (C).

The insulator component piece according to the fifth invention and the spacer insulator according to the sixth invention can constitute a set of heating wire insulators according to any of the first to third inventions. Things. Brief Description of Drawings

FIG. 1 is a front view of an insulator constituting piece A according to the present invention as viewed from a gas flow direction. FIG. 2 is a front view of the insulator component B according to the present invention as viewed from the gas flow direction. FIG. 3 is a front view of the spacer C according to the present invention as viewed from the gas flow direction. FIG. 4 is a transparent front view showing a state in which the insulator component A, the insulator component B, and the spacer insulator C are superimposed in the gas flow direction.

FIG. 5 is a side view for explaining the structure of the heater for generating hot air according to the present invention. FIG. 6 is a partially enlarged front view of the gas flow holes located at the center of the insulator constituent pieces A and B.

FIG. 7 is a front view of an insulator constituting piece according to another embodiment of the present invention as viewed from a gas flow direction.

FIG. 8 is a front view of a spacer insulator according to another embodiment of the present invention as viewed from a gas flow direction.

FIG. 9 is a transparent front view showing a state in which the insulator constituting piece shown in FIG. 7 and the spacer insulator shown in FIG. 8 are overlapped in the gas flow direction.

FIG. 10 is an explanatory perspective view of a heating wire insulator used in a conventional heater for generating high-temperature hot air.

FIG. 11 is a side perspective view of a conventional heater for generating hot air.

Symbols in the figure: (A) (B) (20) ... insulator component pieces, (C) (40) ... spacer insulators, (10) (21) ... gas flow holes, (10 s) ... Space part, (1 1) ... protruding, (12 a, 12 b, 12 c) (22 a, 22 b, 22 c) (22 x, 22 y, 22 z) (12 c) (42 ) ... communication part, (14) (44) ... space, (16) (46) ... frame part, (30) ... heater body part, (31) ... suction port, (32) ... discharge port, (G1) (G2) (G3) ... insulator for heating wire. Best mode for carrying out the invention

Hereinafter, the best mode for carrying out the invention will be described with reference to the accompanying drawings. FIGS. 1 to 3 are front views of three types of component pieces for constituting a set of heating wire insulators according to the present invention, as viewed from the gas flow direction, respectively. Insulator component A, Fig. 2 shows insulator component B, and Fig. 3 shows spacer insulator C. FIG. 4 is a transparent front view showing a state in which these three types of component pieces are superimposed in the gas flow direction. FIG. 5 is a view showing three sets of the heating wire insulators as heaters for generating hot air. FIG. 4 is an explanatory side view for explaining a state where it is housed and arranged inside the device.

First, the insulator component A shown in Fig. 1 is made of a disk-shaped plate with a certain thickness and a circular shape in a front view, with a thickness of about 10 mm and an outer diameter of about 84 mm. It consists of ceramic insulation and insulation.

A large number of gas flow holes 10 each having a circular cross section are formed in the entire surface of the insulator component A in almost all directions from the center to the peripheral portion. The three gas flow holes 10c in the central portion are provided with a temperature sensor insertion portion 10s formed of a space for passing a temperature sensor (not shown). The temperature sensor passage portion 10 s is formed so as to extend the center side portion of the insulator constituting piece A of the through hole serving as the gas flow hole 10 c. Three temperature sensors can be provided by the temperature sensor passage 10 s.

In the peripheral part of the insulator component A, there are three places where the gas flow holes 10 are not provided at substantially the same intervals in the circumferential direction, and this portion is used for fixing the component A to each other. Through-holes 12 a for wiring electrode terminals of terminals of a heating wire such as a wire are formed respectively. The through-portions 12a are formed by cutouts having a predetermined width and a predetermined length from the outer peripheral edge of the insulator component piece A to the center point of the component piece A, and are formed at equal intervals in the circumferential direction. . That is, these communicating portions 12a are formed at intervals of 120 degrees at the central angle. The communicating portion 12a formed at the upper part in FIG. 1 is formed at a position deviated by 4 degrees (α) counterclockwise from the center line Y.

The gas flow hole 10 has an inner diameter of about 7.7 mm, which will be described later. Four protrusions are formed on the inner wall of the gas flow hole 10 in the gas flow direction. The gas flow hole 10c at the center of the insulator component A is provided with a sensor passage 10s, so that only three ridges are formed.

The insulator component B shown in Fig. 2 has almost the same configuration as the insulator component A described above, except for one point for fixing the insulator and for wiring the electrode terminal of the terminal of the heating wire. Only the position of the communication section 1 2b is different. That is, the communicating portion 12b formed at the upper part in FIG. 2 is formed at a position shifted 9 degrees (j3) counterclockwise from the center line Y. Therefore, these three communicating portions 1 2 b are formed by the insulating component A. The through-portion 12a and its position are located at positions offset by 5 degrees (j8- _α ) counterclockwise, respectively. The rest of the configuration is exactly the same as the above-mentioned insulator component piece Α.

FIG. 3 shows a spacer insulator C which is a component piece for constituting a set of insulators for a heating wire, and its thickness and outer diameter are almost the same as those of the insulator component pieces A and B. Force Many individual gas circulation holes do not exist at all, and the center part is a hollowed-out space 14, consisting only of a frame part 16 consisting of a circular frame in a front view, such a frame part Extension portions 18 are formed at three locations 16 at the same interval toward the center thereof, and each of the three extension portions 18 is provided with a through portion 12c formed of a long hole. These through-holes 12 c are formed at equal intervals in the circumferential direction (at 120-degree intervals at the center angle), and the through-holes 12 a formed on the insulator component pieces A and B are formed. , 1 2b. Thus, when the insulator constituent pieces A and B and the spacer insulator C are overlapped, these respective through portions 12a, 12b, and 12c can be arranged at the same position. .

FIG. 4 is a front perspective explanatory view showing a state in which the above-mentioned insulator component piece, the insulator component piece B and the spacer insulator C are superimposed, and shows the positional relationship between the gas flow holes 10 and 10 and the respective positions. The passages 12a, 12b, and 12c can be seen in the positional relationship. As can be seen from these figures, in these three types of component pieces, when they are superimposed on each other, the through portions 12a, 12b, and 12c for fixing and Z or electrode wiring are different. Each is arranged at the same position. At this time, the positions of the gas flow holes 10 of the insulator constituent pieces A and B are slightly shifted. Immediately, with respect to the center point of each component piece, the gas flow hole of one component piece has a positional relationship shifted by 5 degrees at the central angle from that of the other component piece.

Furthermore, any of the insulator components A and B can be freely arranged on the near side or the opposite side, but the spacer insulator C must be arranged between these insulator components A and B. In this way, a suitable set of heating wire insulators is formed by overlapping the appropriate number of insulator component pieces A and B and spacer insulator C.

In one set of heating wire insulators having such a configuration, as described above, Since the gas flow holes of all the adjacent insulator component pieces have a slightly shifted positional relationship through the spacer insulator, when a heating wire such as a dichrome wire is wired to these gas flow holes, The heat wire is swirled by the insulator component pieces A and B, and is securely fixed and held. This prevents the heating wire from moving up and down even when the gas flow hole of the insulator is oriented vertically, or prevents the heating wire from jumping out of the gas flow hole due to the wind pressure of the blowing gas. In addition, no adverse effects are caused by vibrations.

FIG. 5 is a side perspective explanatory view showing an example of use of the above heating wire insulator, showing a state in which three sets of heating wire insulators are disposed in a heater for generating hot air.

The main body 30 of the heater for generating hot air is made of stainless steel and has a cylindrical shape, and a gas suction port 31 is formed at the lower part on the right end side in the figure. A blower and the like are connected. A discharge port 32 for discharging hot air is formed on the left end side of the main body 30. Inside the main body 30, three sets of heating wire insulators Gl, G2, and G3 are housed and fixed. Each of the insulators Gl, G2, and G3 is composed of the insulator component A (shown by oblique lines rising to the right), the insulator component B (shown by oblique lines that descend to the right), and the spacer insulator C (lattice) (Indicated by diagonal lines)).

In the pair of heating wire insulators G1 at the left end on the discharge port side, two insulator component pieces A shown in Fig. To the right of the spacer insulator C shown in Fig. 3, one piece of the insulator is also superposed, with the position of the through-portion 12c matching the through-portion 12a of the insulator component piece A. In the same manner, the insulator component B shown in FIG. 2 is similarly overlapped with one piece so that the position of the through portion 12 b matches the through portion 12 c of the spacer insulator C. One spacer insulator C, one insulator component piece, one spacer insulator C, and two insulator component pieces B are superimposed and a total of nine component pieces are overlapped to form a set. This constitutes the heating wire insulator G1.

Similarly, in the central set of heating wire insulators G2, two insulator component pieces, one spacer insulator C, one insulator component piece 8, and one A pair of insulators C and two insulator components A are sequentially superimposed from left to right to form a set of heating wire insulators G 2 with a total of seven components. Furthermore, in the set of heating wire insulators G3 on the far right side, similarly, two insulator component pieces 8, one spacer insulator C, one insulator component piece, and one spacer A pair of insulators C and two insulator component pieces B are sequentially superimposed from left to right, and a total of seven component pieces constitute one set of heating wire insulator G3.

As described above, each of the insulators Gl, G2, and G3 has two identical pieces A or B at the both ends, but at the middle part, the mutual contact structures are in contact. In the piece, different component pieces B are located, and spacer insulator C is arranged between them. Thus, the gas flow holes 10, 10,... Of the insulator component piece B have a slightly shifted positional relationship, and the heating wire can be twisted and held reliably. Here, the method of superimposing the insulator constituent pieces can be set arbitrarily, and it is not always necessary to superimpose two pieces at both ends, and the insulator is configured by interposing spacer insulators C one by one alternately. Pieces A and B can be overlapped. Alternatively, two insulator components A and B may be alternately superimposed on each other, and one spacer insulator C may be interposed therebetween. Furthermore, two spacer insulators can be stacked and interposed between the insulator component pieces A and B, and the overlap number of the insulator component piece A and the overlap number of the insulator component piece B can be varied. They can be superimposed on each other via insulators. Thus, the method of superimposing the three types of component pieces can be performed completely freely. However, spacer insulator C must be placed between insulator components A and B. Unless this spacer is interposed, wiring of the heating wire becomes difficult.

In addition, when stacking the insulator component pieces, it is necessary to arrange the positions of the through portions 12a, 12b, and 12c of the component pieces in the same manner, and as a result, each set of heating wire The insulator is fixed, and the terminal 35 of the electrode terminal 33 of the heating wire can be arranged collectively at the right end of the gas inlet 31 side.

The electrode terminal 33 uses a metal plate because it is also used for fixing each insulator component piece. In FIG. 5, the electrode terminal 33 is used for simplicity. Although only one is shown in the figure, it is actually provided at each of three locations in each of the communication sections.

Furthermore, regarding insulator component pieces A and B, Therefore, it is necessary to set the temperature within a certain range in consideration of the wiring of the heating wire and the pressure loss in the flow of gas. That is, in the above embodiment, the difference in the positions of the gas flow holes is provided with a difference of about 5 degrees as the central angle, but this difference is not less than 5 degrees and not more than 5 degrees. It is only necessary that the gas flow holes of the insulator component piece can appropriately hold and fix the nichrome wire, and that the pressure loss of the blown gas be suppressed as much as possible. By displacing the gas flow holes in this way, the heating wire can be reliably held, and through the spacer insulator, even if the gas flow holes are misaligned, there is no problem in the wiring of the heating wire. It has the effect of not occurring. At the same time, the presence of this space 14 also makes it possible to reduce the uneven temperature rise of the blown gas in the gas flow holes of the insulator constituent pieces A and B, and to reduce the heating wire in some of the gas flow holes. Excessive temperature rise can be suppressed, which also contributes to prevention of disconnection of the heating wire. In the heater for generating hot air, three sets of heating wire insulators G1, G2, and G3 are housed as described above, and power can be supplied independently to the nichrome wires wired to these. It becomes.

For example, in the case of the present embodiment, the nichrome wire wired to the insulator G3 near the suction port 31 is supplied with power of about 5 to 7 WZ cm ² (watt density) to convert gas from normal temperature to about 5 WZ cm ² (watt density). 4 was heated to 0 0 ° C position, the nichrome wire, which is wired to the next insulator G 2 supplies power of about 4 to 6 W_ cm ^2, the gas to about 4 0 0 ° C from 6 0 0 ° Heat to about C, and finally supply the power of about 2 to 4 WZ cm ² to the insulator G 1 located closest to the discharge port side to generate hot air of about 800 ° C or more .

In contrast, in the conventional heater shown in Fig. 11, the same heating wire reciprocates from the entrance to the exit of the insulator due to its structure, and the surface load of this heating wire is the highest. There was a waste of having to fit the place.

In the case of a conventional type of heater having a continuous maximum discharge temperature of 800 ° C. and a capacity of 12 kW, the length L 1 of the heater storage section in the discharge direction (see FIG. 11; The one in the figure is not a capacity of 12 kW but a smaller capacity.) Was about 725 mm, but the same continuous maximum discharge temperature as this conventional heater was 800 With the heater of the present invention at 12 ° C and the same capacity of 12 ° C, the discharge direction The length L 2 (see Fig. 5) can be reduced to 346 mm, and the length can be reduced to about half. This fact clearly demonstrates that the heater according to the present invention exerts extremely high heat exchange efficiency.

FIG. 6 is a partially enlarged front view of a gas flow hole located at the center of the insulator component A or B. The gas flow hole 10 is formed of a circular through hole having an inner diameter of approximately 7.7 mm, and has four ridges 11 formed at the same interval in the gas flow direction on the inner wall. A heating wire such as a chrome wire on which the ridge 11 is wound can be held in the gas flow hole 10 at a constant distance from the inner wall, and the inner and outer surfaces of the wound heating wire can be maintained. The blast gas contacts the blast gas properly, and heat is effectively conducted from the heating wire to the blast gas, resulting in higher thermal efficiency.

In the gas flow hole 10c in the central part, a temperature sensor insertion portion 10s consisting of a space portion in which the wall surface of the gas flow hole is expanded is formed at the center point side of the insulator constituting piece, and one set of power supply holes is formed. After the heat wire insulator is superimposed, a temperature sensor such as a thermocouple is inserted into the temperature sensor passage 10 _s from the end on the suction port side of the heater and deployed, so that temperature measurement at a desired position can be performed. It becomes possible.

FIG. 7 is a front view showing an insulator constituting piece 20 according to another embodiment of the present invention viewed from the gas flow direction, and FIG. 8 is a view showing a space according to another embodiment of the present invention. It is the front view which looked at the insulator 40 from the gas flow direction illustrated.

First, the insulator component piece 20 shown in FIG. 7 is a disc-shaped plate-like body having a constant thickness and a circular shape in a front view similar to the insulator component pieces A and B according to the embodiment, and is made of ceramic. Made of thermal insulation and insulator. The size is about 10 mm in thickness and about 66 mm in outer diameter, and is slightly smaller than the insulator component pieces A and B according to the above embodiment. Further, this insulator component piece 20 is only one type, and the position of the gas flow hole 21 can be slightly shifted by the arrangement of the insertion portion provided on the peripheral portion. A large number of gas flow holes 21, 21,... Formed of through-holes having a circular cross section are formed in the entire surface of the insulator component piece 20 in almost all directions from the center portion to the peripheral portion. You. The two gas flow holes 21c and 21c at the center are provided with temperature sensor passages 21s and 21s, respectively, which are spaces for passing a temperature sensor (not shown). La It is. The temperature sensor communication portion 21 s is formed so as to extend the center side portion of the insulator component piece 20 of the through hole that is the gas flow hole 21 c. Two temperature sensors can be provided by these two temperature sensor passages 21 s. A set of three through-holes (22) are provided around the periphery of the insulator component piece 20 to fix the component piece 20 to each other and to wire the electrode terminals of the terminals of the heating wire such as a dichrome wire. a, 22 b, 22 c) are arranged at the same interval, that is, the center angle is set at an interval of 120 degrees, and another set of three communicating portions (22 x, 22 y, 22 z) is arranged at the same interval. In addition, the central angles are formed at intervals of 120 degrees. Then, these two sets of through-holes (22a, 22b, 22c) and through-holes (22x, 22y, 22z) are provided at positions shifted counterclockwise by 65 degrees (γ), respectively. ing.

As a result, the two pieces of the insulator component pieces 20 are overlapped, and the communicating portions (22a, 22b, 22c) of one insulator component piece 20 are connected to the communicating portions (22) of the other insulator component piece 20. x, 22 y, and 22 z), respectively, by disposing the through portion 20 a of one insulator component 20 and the through portion 20 X of the other insulator component 20 at the same position. , And the positions of the gas flow holes 21, 21,... Are slightly shifted, that is, in this embodiment, the center angles are shifted by 5 degrees. It will be.

Each form of the through-holes in this embodiment is formed in a notch shape elongated in the circumferential direction at a certain angle from the outer peripheral edge of the insulator component piece 20. More strictly, these through portions are formed at an angle of about 45 degrees (δ) with respect to the center line Y.

These insertion portions are formed by cuts having an angle of 45 degrees with respect to the center line Υ, but this angle is completely arbitrary and can be set freely.

The inner diameter of the gas flow hole 21 is about 7.7 mm, and each of the inner walls is formed with four ridges 25 for supporting a heating wire in the gas flow direction. Same as pieces A and B.

FIG. 8 shows a spacer insulator 40 whose thickness and outer diameter are the same as those of the insulator. It is almost the same as the piece 20, but does not have many individual gas flow holes at all, and has a hollowed-out space 44 at the center. The extended portions 48 are provided at the same intervals at three positions of the frame portion 46, and the extended portions 48 are provided with the through portions 42 formed of long holes. These through portions 42 are formed at equal intervals in the circumferential direction, that is, their central angles are formed at 120 degrees, and the through portions (2) of the insulator component piece 20 shown in FIG. 2 a, 22 b, 22 c) or through-holes (22 x, 22 y, 22 z) can be positioned at the same position as these cut-outs It is formed by long holes. Therefore, by making the two insulator constituent pieces 20 and 20 coincide with the through hole 20a and the through hole 2O x, the gas flow holes 21 1, 2 1,. The spacers are displaced from each other, and the spacers 40 are arranged between the insulator component pieces 20 and 20, and the through portions of the spacers 40 (42, 42, 4) 2) Place the through-holes (22a, 22b, 22c) and the through-holes (22x, 22y, 22z) of the insulator pieces 20 and 20 in the same position. It can be placed.

FIG. 9 is a perspective front view of the state in which the insulator constituent pieces 20 and 20 and the spacer insulator 40 are superimposed on each other, and shows the positional relationship between the gas flow holes 21, 21, and so on.ること Look at the relative positions of the through-holes (22a, 22b, 22c) (22x, 22y, 22z) (42, 42, 42). Can be.

As can be seen from these figures, in these three component pieces and spacer insulators, when they are superimposed on each other, the respective through portions (22 a, 2 2 b, 2 2 c) (22 x 22 y, 22 z) (42, 42, 42) are arranged at the same position. At this time, the positions of the gas flow holes 21, 21,... Of the insulator component pieces 20, .20 are slightly shifted. That is, the gas flow holes of one of the constituent pieces are shifted from the other by 5 degrees at the center angle with respect to the center point of each of the constituent pieces.

Further, any of the insulator components 20, 20 may be arranged on the near side or the opposite side, but the spacer insulator 40 must be arranged between these insulator components 20, 20. There is. In this way, the appropriate number of insulator constituent pieces 20, 20,. A set of heating wire insulators is formed by superposing the insulators 40. In a set of heating wire insulators having such a configuration, as described above, the gas flow holes of some or all of the adjacent insulator component pieces are shifted slightly through the spacer insulator. Therefore, when a heating wire such as a dichromium wire to be wired in the gas flow hole is wired, the heating wire is twisted by the insulator constituting piece and is securely fixed and held. This prevents the heating wire from moving up and down when the gas flow hole of the insulator is oriented vertically, or prevents the heating wire from jumping out of the gas flow hole due to the wind pressure of the blowing gas. In addition, vibrations and the like do not have any adverse effects.

One set of heating wire insulators is constructed as described above. One or two or more sets of these insulators are housed in a heater with a predetermined interval between them, and they are placed in a high position. As in the first embodiment, a heater for generating hot hot air can be configured.

As described above, the best embodiment has been described. However, in the present invention, the design can be further changed as follows.

The shape and size of the insulator component and the spacer insulator can be appropriately designed as needed.

In the above embodiment, these external shapes are circular when viewed from the front, but they may be elliptical, square, or polygonal. In this case, the shape of the main body of the heater must be adapted to this.

Also, their outer diameter sizes can be set arbitrarily. The thickness of the insulator component piece and the spacer insulator is set to 10 mm, but may be 10 mm or more or 10 mm or less. Furthermore, the thicknesses of the insulator component piece and the spacer insulator may not be the same, but may be different thicknesses.

In each of the above embodiments, the gas flow hole for wiring the heating wire has a circular cross section, but may have a quadrangular shape with rounded corners.

In addition, the inner diameters of a number of gas flow holes drilled in each insulator component In each of the embodiments, all are the same, but the inner diameter of the gas flow hole located in the center portion may be formed slightly larger than the inner diameter of the gas flow hole formed in the peripheral portion.

The temperature sensor passage may be provided in one gas flow hole located in the center of the insulator component piece, or may be provided in two or more as required.

The configuration of the insulator component piece and the through-hole for fixing and / or electrode wiring provided on the peripheral portion of the spacer insulator can be freely designed as appropriate.

In the insulator component piece, this through-hole is formed by cutting, but it may be formed as a long hole provided in the spacer insulator. Conversely, the through portion of the spacer insulator can be formed by cutting.

Further, the through portion may be formed by a mere small hole, a wire may be inserted through the small hole, and a pair of insulators may be fixed at both ends to form a terminal terminal of a dichrome wire. Of course, it is also possible to use these small holes to fix with a long axis port and nut.

In the present invention, as a means for fixing using the through-hole, a long strip-shaped metal plate 33 (see FIG. 5) is used, and the plate 33 simultaneously serves as a nichrome wire electrode terminal. Doubles as well. Here, if the supply power is three-phase, this plate is basically three, but if it is a large capacity, it may be six or nine in terms of the circuit configuration. For single phase, use two, four or six. Therefore, the number of the communication portions can be set freely as needed.

The band-shaped plate has a length that connects from a fixed set of heating wire insulators to the electrode 35 at the right end of the suction port 31. The plate 33 is provided with cutouts at, for example, portions located at both ends of a set of insulators G1, and the cutouts of the plate are appropriately bent so that the insulator constituent pieces and the like can be fixed. The fixing means such as the insulator component piece can be performed in various forms using the above-mentioned through-hole.

The inner diameters of a large number of gas flow holes provided in the insulator component piece can also be appropriately set as needed, and the number can be freely determined. When the insulator component is square in front view, the gas flow holes can be slightly shifted in the horizontal, vertical or oblique directions.

In the above embodiment, the center angles of the adjacent insulator component pieces are shifted by 5 degrees, but may be 5 degrees or more or 5 degrees or less, as long as the nichrome wire can be appropriately held and fixed. Just fine. That is, if the central angle is too large, the displacement of the gas flow holes located in the peripheral portion is too large, and it becomes difficult to wire the nichrome wire, and the gas flow is obstructed, and the problem of pressure loss occurs. If the central angle is too small, the gas flow holes located in the central part will be less displaced, and the effect of holding and fixing the nichrome wire will be reduced. In the above embodiment, the positions of the gas flow holes of the adjacent insulator component pieces are slightly shifted by a fixed central angle of 5 degrees to be shifted, but the difference of the central angles of the gas flow holes located inside is different. However, it is possible to shift the gas flow holes formed in the outer portion to a greater extent than the difference in the central angle. This makes it possible to correct that the displacement of the inner gas flow hole is small.

The number of protrusions provided on the inner wall of the gas flow hole of the insulator component piece can also be freely set, but three or four are provided to appropriately support the spirally wound -chrome wire. Is desirable. Further, the ridges are provided continuously throughout the gas flow direction on the inner wall of the gas flow hole, but may be provided intermittently in the flow direction. In the heater for generating high-temperature hot air, the heating wire insulator (polymer of insulator component piece and spacer insulator) housed in the heater may be one set, but preferably two or more sets. Is better, and it is best to arrange two or more sets of heating wire insulators at regular intervals.

The spacing between the heating wire insulators can be freely set as appropriate, but it is desirable that the spacing be larger than the thickness of one spacer insulator.

The main body of the heater has a cylindrical appearance, but the design can be changed as appropriate according to the outer shape of the insulator. The gas inlet provided at the lower part on the right end side may be formed on the right end face part of the main body.

As described above, the present invention can be variously modified within the scope of the claims.

Claims

The scope of the claims

The insulator component (A, B) consists of a plate-like body with a number of gas flow holes (10, 10, ...) perforated, and the component is fixed to the periphery and / or One or more through-holes (12a, 12b) to which electrodes can be wired are formed, and a plurality of these insulator component pieces (A, B) can be overlapped in the air blowing direction to form an insulator. In the superposed state, the positions of the gas flow holes (10, 10,...) Of some or all of the adjacent constituent pieces are arranged in a positional relationship slightly shifted from each other, and Or, the through-holes (12a, 12b) for the electrode wiring can be arranged at the same position, and in the insulator thus superimposed, adjacent insulator component pieces in which the positions of the gas flow holes are shifted from each other. Between the two, there is a peripheral portion where a fixing portion and an insertion portion (12c) for electrode wiring are provided at the same position as the insulator constituting piece. A pair of insulators (C) consisting of frame-shaped insulators is arranged to form a set of heating wire insulators (Gl, G2, G3), and the gas flow holes of this set of heating wire insulators Insulator for heating wire of heater for generating hot air that can wire heating wire such as nichrome wire. In claim 1, a space (10s) through which a temperature sensor can be passed through one or more gas flow holes (10c) formed in the center of the insulator component pieces (A, B). ) Is an insulator for a heating wire of a heater for generating hot air. In claims 1 or 2, a plurality of ridges (11, 11, ...) that can support the heating wire are provided in the gas flow direction on the inner wall of the gas flow hole, A heating wire for a heater for generating hot air, wherein the heating wire can be supported in the gas flow hole while maintaining a distance from an inner wall thereof. A substantially cylindrical hot air generating heater having a gas suction port (31) at one end portion which can be connected to a blower or the like via a pipe, and a discharge port (32) at the other end portion for discharging hot air. The heating wire insulator according to any one of claims 1 to 3, wherein a heating wire is wired inside the heater (Gl, G2, G3) is a heater for generating hot air that is housed at predetermined intervals and can supply power independently to the heating wires of each set of insulators. It consists of a plate with a number of gas flow holes (10, 10, ...) perforated, and one or two or more penetrations (12a, 12b) for fixing and Z or electrode wiring on the periphery. ) Is the insulator component (A, B) that constitutes the set of heating wire insulators (Gl, G2, G3) according to any one of claims 1 to 3 Insulator for heating wire. Claims 1 to 3 wherein only one or more insertion parts (12c) for fixing and / or electrode wiring are formed in the peripheral part, and the center part is a space (14). A spacer insulator (C) consisting of a frame-shaped insulator placed at one or more positions of one set of heating wire insulators (Gl, G2, G3) described in any of Roller heating wire insulator.