JP3722410B2 - Inner tube support mechanism in single-ended radiant tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support mechanism for an inner tube in a single-ended radiant tube.
[0002]
[Prior art]
For example, as shown in FIGS. 9 and 10, the single-ended radiant tube is a radiant tube having a double tube structure in which an inner tube b is coaxially supported in the outer tube a and the burner head c. The fuel supply pipe e provided with a flame stabilizer d at the tip is inserted into the inner pipe b and burned in the inner pipe b, and the combustion gas turned back at the other end side is connected to the outer pipe a and the burner head c. It is the structure which exhausts through.
[0003]
In such a single-ended radiant tube, the outer tube a may be made of metal and the inner tube b may be made of ceramic from the viewpoint of heat resistance depending on the operating temperature. The inner tube b is formed with a flange portion f at one end and is completely fixed and supported on the burner head c by flange joining.
[0004]
[Problems to be solved by the invention]
In the conventional single-ended radiant tube described above, during combustion at a high temperature, the metal outer tube may be deformed by thermal stress as shown by the broken line in FIG. However, since the ceramic inner tube hardly deforms, a large force may be applied to the inner tube when the outer tube contacts the inner tube, and the inner tube is damaged depending on the applied force.
Therefore, the present invention aims to solve such problems.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention can tilt the outer periphery of the end of the inner tube on the burner head side of a single-ended radiant tube while pressing the heat-resistant annular elastic sealing member to maintain airtightness. And an inner tube support device that elastically protrudes a support rod provided with an inner tube receiving member in the burner head, and the location of the inner tube away from the end in the burner head, A mechanism for supporting an inner tube in a single-ended radiant tube, which is configured to be supported by the elastic force of a spring via an inner tube receiving member and a support bar, is proposed.
[0006]
In the present invention, it is proposed that in the above configuration, the annular elastic sealing member is constituted by a high-temperature gland packing.
[0007]
Further, in the present invention, in the above configuration, it is proposed to configure a part of the gas supply pipe installed in the inner pipe as a flexible pipe.
[0008]
According to the present invention, in the above configuration, the inner tube support device is configured to support the inner tube at a predetermined position by the inner tube receiving member via the support bar from the lower side or the upper side, and the elastic force. It is proposed to construct an adjustment mechanism that adjusts.
[0009]
Further, in the present invention, in the above configuration, it is proposed that the inner tube receiving member is configured to be tiltable with respect to the support bar.
[0010]
According to the present invention described above, the inner tube is coaxially supported in the outer tube by the annular elastic sealing member such as the high temperature gland packing and the inner tube receiving member provided on the support rod body of the inner tube support device. The inner pipe does not require a supporting flange, and a straight pipe can be used.
[0011]
When the outer tube is deformed and abuts against the inner tube and an external force is applied from the upper side, the inner tube pushes down the inner tube receiving member against the elastic force and tilts downward with the annular elastic sealing member as a fulcrum. Since the inner tube does not resist the external force in this way, a large force is not applied thereto, and breakage can be prevented.
[0012]
If a part of the gas supply pipe installed in the inner pipe is configured as a flexible pipe, the gas supply pipe and the flame holder are also tilted according to the tilt of the inner pipe, so that a large force is not applied to the inner pipe in this respect as well. .
[0013]
If the elastic force for supporting the inner tube by the inner tube support device, and hence the external force necessary to tilt the inner tube, can be adjusted, damage to the inner tube can be prevented and the centering of the inner tube can be adjusted. .
[0014]
If the inner tube receiving member is configured to be tiltable with respect to the support rod body, the inner tube receiving member can follow the position of the inner tube and always support the inner tube on the surface, and can be locally applied by point or line contact. It is possible to prevent a large force from being applied.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention. FIGS. 1 and 2 are longitudinal sectional views showing the structure of a burner head side of a single-ended radiant tube. FIG. FIG. 4 is an enlarged cross-sectional view showing the inner tube support device in an enlarged manner.
[0016]
In the figure, reference numeral 1 generally indicates a burner head of a single-ended radiant tube, reference numeral 2 indicates a metal outer tube, 3 indicates a ceramic inner tube, and the inner tube 3 is a straight tube. Reference numeral 4 denotes a furnace wall to which the radiant tube is attached.
[0017]
The burner head 1 is provided with a rear wall 6 formed with an insertion hole 5 through which the inner tube 3 can be inserted with play, and a packing receiving recess 7 is formed on the insertion hole 5 side of the rear wall 6. Then, a high temperature gland packing 8 is attached to the packing receiving recess 7 as an annular elastic sealing member having heat resistance, and the packing retainer 9 is screwed from the outside, whereby the high temperature gland packing 8 is attached to the end of the inner tube 3. It is supported in the press contact state on the outer periphery of the part.
[0018]
For this reason, the inner pipe 3 which is a straight pipe is hermetically partitioned from the burner head 1 by a high-temperature gland packing 8 at its end, and the high-temperature gland packing 8 can be elastically deformed, so that it can be tilted using it as a fulcrum. Supported.
[0019]
An air chamber 11 connected to the air supply pipe 10 is formed on the outer periphery of the end of the burner head 1, and the end of the inner pipe 3 is open to the air chamber 11. On the other hand, an exhaust pipe 12 is connected to the end of the burner head 1.
[0020]
Reference numeral 13 generally indicates an inner tube support device. The inner tube support device 13 passes through the air chamber 11 and the burner head 1 from the device main body 14 installed outside the lower portion of the air chamber 11, and then burner head 1. The support rod 15 is elastically projected inside. An upper portion of the support rod 15 is provided with an inner tube receiving member 17 having a support surface 16 in contact with the inner tube 3.
[0021]
A specific configuration example of the apparatus main body 14 will be described with reference to FIG. 4. The apparatus main body 14 includes a compression coil spring 19 that urges the support bar 15 in a protruding direction against a casing 18 that supports the support bar 15 so as to be able to advance and retreat. Is installed. The compression coil spring 19 is interposed between a stopper 20 provided on the support bar 15 and an adjustment plate 22 that can be screwed into a female screw portion 21 formed on the casing 18 to advance and retract. By rotating and advancing and retracting, the elastic force with respect to the stopper 20 and thus the support bar 15 can be adjusted.
[0022]
Thus, as shown in FIG. 1, the inner tube 3 is supported by the high-temperature gland packing 8 so as to be tiltable, and the inner tube receiving member 17 of the support rod 15 of the inner tube support device 13 is supported. The surface 16 is coaxially supported in the outer tube 2 in the burner head 1.
[0023]
At this time, the centering of the inner tube 3 can be adjusted by turning the adjusting plate 22 to adjust the elastic force of the compression coil spring 19 with respect to the support rod 15.
[0024]
As described above, in the inner tube 3 that is coaxially supported in the outer tube 2 in the burner head 1, the gas supply tube 24 provided with the flame stabilizer 23 at the tip is inserted and supported coaxially. The gas supply pipe 24 is partially configured as a flexible pipe 25.
[0025]
Thus, as described above during combustion at a high temperature, the metallic outer tube 2 is deformed by thermal stress, or is bent by its own weight, abuts against the inner tube 3, and an external force of a predetermined level or more is applied to the inner tube 3. When applied, the inner tube 3 pushes down the inner tube receiving member 17 against the elastic force of the compression coil spring 19 and tilts downward with a support point by the high temperature gland packing 8 as a fulcrum.
[0026]
As described above, the inner tube 3 tilts without resisting an external force of a predetermined value or more, so that a large force of a predetermined value or more is not applied thereto, and damage can be prevented.
[0027]
The external force that the inner tube 3 tilts, that is, the elastic force that supports the inner tube 3 via the inner tube receiving member 17 can be adjusted by turning the adjusting plate 22 to prevent damage to the inner tube 3. Appropriate adjustment can be made in consideration of preventing the occurrence of unnecessary vibration of the inner tube 3.
[0028]
As described above, when the inner pipe 3 tilts downward due to the external force from the outer pipe 2, a part of the gas supply pipe 24 installed in the inner pipe 3 is configured as the flexible pipe 25. The gas supply pipe 24 and the flame holder 23 are also tilted according to the tilting, and a large force is not applied to the inner pipe in this respect.
[0029]
Next, FIG. 5 shows a longitudinal sectional view of the inner tube support device 13, and the inner tube receiving member 17 is configured to be tiltable with respect to the support rod body 15, for example, with the axis o as a fulcrum.
The inner tube receiving member 17 can always support the inner tube 3 by a surface following the tilting of the inner tube 3, and therefore does not support the inner tube 3 by point or line contact. Can be prevented.
[0030]
As long as the inner tube receiving member 17 can stably support the inner tube 3, its size and the like can be set as appropriate. For example, as shown by a dotted line 16 ′ in FIG. By supporting a long arc portion along the outer periphery, the stability in the left-right direction in FIG. 4 can be enhanced.
[0031]
Next, FIGS. 6 to 8 show a second embodiment of the present invention, which is an inner tube support installed on the lower side of the burner head 1 in the first embodiment. The apparatus is installed on the upper side of the burner head 1, and the same reference numerals are given to the common components except for the inner tube support apparatus, and redundant description is omitted.
That is, in these drawings, reference numeral 33 generally indicates an inner tube support device. The inner tube support device 33 is connected to the air chamber 11 and the burner head 1 from the device main body 34 installed outside the upper portion of the air chamber 11. The support rod 35 is protruded into the burner head 1, and an annular inner tube receiving member 37 having a diameter slightly larger than the outer diameter of the inner tube 3 is provided at the lower portion of the support rod 35. Yes.
[0032]
The apparatus main body 34 supports an adjustment jig 38 that supports the support bar 35 so that the support bar 35 can be moved forward and backward, and is supported by a support fitting 39 fixed to the burner head 1 so that the position can be adjusted by screwing the male and female screws 40, 41. A compression coil spring 43 is interposed between a stopper 38 provided at the end of the support member 35 and the support bar 35.
[0033]
In the above configuration, as shown in FIG. 1, the inner tube 3 is supported by the high-temperature gland packing 8 so that the end portion thereof is tiltable, and the annular inner tube of the support bar 35 of the inner tube support device 33. The receiving member 37 is biased upward by the elastic force of the compression coil spring 43 and is supported coaxially with the outer tube 2 in the burner head 1.
[0034]
At this time, the centering of the inner tube 3 can be adjusted by turning the adjusting jig 38 to adjust the elastic force of the compression coil spring 43 with respect to the support bar 35.
[0035]
Thus, as described above during combustion at a high temperature, the metallic outer tube 2 is deformed by thermal stress, or is bent by its own weight, abuts against the inner tube 3, and an external force of a predetermined level or more is applied to the inner tube 3. When added, the inner tube 3 pushes down the inner tube receiving member 37 against the elastic force of the compression coil spring 43 and tilts downward with a support point by the high temperature gland packing 8 as a fulcrum.
[0036]
As described above, the inner tube 3 tilts without resisting an external force of a predetermined value or more, so that a large force of a predetermined value or more is not applied thereto, and damage can be prevented.
[0037]
In this embodiment, the inner tube receiving member 37 is formed in an annular shape, but may be formed in a hook shape as long as it has strength to receive the inner tube. However, an annular shape is preferable in consideration of deformation due to heat.
[0038]
Similarly to the first embodiment, if the inner tube receiving member 37 is configured to be tiltable with respect to the support bar 35 with, for example, the axis o ′ as a fulcrum, the inner tube receiving member 37 is the inner tube 3. Following the tilting, the inner tube 3 can always be supported by a surface, and therefore the inner tube 3 is not supported by point or line contact, so that a large force can be prevented from being applied locally.
[0039]
As described above, when the inner tube 3 tilts downward due to the external force from the outer tube 2, a part of the gas supply tube 24 installed in the inner tube 3 is replaced with the flexible tube 25 as in the above embodiment. By configuring as above, the gas supply pipe 24 and the flame holder 23 are also tilted in accordance with the tilt of the inner pipe, and in this respect also, it is possible to prevent a large force from being applied to the inner pipe.
[0040]
【The invention's effect】
Since the present invention is as described above, the following effects are obtained.
a. The inner tube is tiltably supported, and when an external force is applied from the outer tube, the inner tube is tilted downward and no external force exceeding a predetermined value is applied, so that the inner tube can be prevented from being damaged.
b. The inner pipe does not need to be flanged at the end, and may be a straight pipe. Therefore, the manufacturing cost is reduced and installation is easy.
c. It can also be easily attached to a conventional existing single-ended radiant tube.
d. Because the spring of the inner tube support device that elastically supports the inner tube, for example, the compression coil spring, is installed outside the air chamber covering the burner head, it is not affected by the furnace temperature and is kept at a low temperature. The characteristics of the spring are maintained, and the inner tube can be stably supported.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a configuration of a burner head side of a single-ended radiant tube to which the present invention is applied.
FIG. 2 is a longitudinal sectional view showing a state where an outer tube is deformed in the configuration on the burner head side shown in FIG. 1;
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is an enlarged cross-sectional view showing the inner tube support device in an enlarged manner.
FIG. 5 is an enlarged vertical sectional view showing the inner tube support device in an enlarged manner.
FIG. 6 is a longitudinal sectional view showing a second embodiment of the configuration on the burner head side of the single-ended radiant tube to which the present invention is applied.
FIG. 7 is an enlarged cross-sectional view showing the inner tube support device in an enlarged manner.
FIG. 8 is an enlarged view of a main part of FIG.
FIG. 9 is a longitudinal sectional view showing a configuration of a burner head of a conventional single-ended radiant tube.
FIG. 10 is a longitudinal sectional view showing a state where an outer tube is deformed in the configuration on the burner head side of a conventional single-ended radiant tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Burner head 2 Outer pipe 3 Inner pipe 4 Furnace wall 5 Insertion hole 6 Rear wall 7 Packing receiving recessed part 8 High temperature gland packing 9 Packing presser 10 Air supply pipe 11 Air chamber 12 Exhaust pipe 13 Inner pipe support apparatus 14 Apparatus main body 15 Support Rod body 16 Support surface 17, 17 'Inner tube receiving member 18 Casing 19 Compression coil spring 20 Stopper 21 Female thread portion 22 Adjustment plate 23 Flame holder 24 Gas supply tube 25 Flexible tube 33 Inner tube support device 34 Device body 35 Support rod body 37 Inner tube receiving member 38 Adjustment jig 39 Support bracket 40 Female screw 41 Male screw 42 Stopper 43 Compression coil spring

Claims (6)

In the single-ended radiant tube, the outer periphery of the inner tube end on the burner head side is supported by an annular elastic sealing member having heat resistance so as to be tiltable while maintaining airtightness. An inner tube support device for elastically projecting a support rod provided with a receiving member is configured, and a portion of the inner tube separated from the end portion in the burner head is spring-loaded through the inner tube receiving member and the support rod. Of inner tube in single-ended radiant tube supported by elastic force The inner tube support mechanism in a single-ended radiant tube according to claim 1, wherein the annular elastic sealing member is a high-temperature gland packing. The support mechanism of the inner pipe in the single-ended radiant tube according to claim 1, wherein a part of the gas supply pipe installed in the inner pipe is configured as a flexible pipe. The inner tube support device according to claim 1, wherein the inner tube support device is configured to support the inner tube at a predetermined position by an inner tube receiving member via a support bar from below, and an adjustment mechanism for adjusting elastic force. Inner tube support mechanism in single-ended radiant tube 2. The inner tube support device according to claim 1, wherein the inner tube support device is configured to support the inner tube at a predetermined position by an inner tube receiving member via a support bar from above, and to configure an adjustment mechanism that adjusts an elastic force. Inner tube support mechanism in single-ended radiant tube 2. The support mechanism for an inner tube in a single-ended radiant tube according to claim 1, wherein the inner tube receiving member is tiltable with respect to the support bar.

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