JPH07101075B2 - Support structure for tube - Google Patents

Description

TECHNICAL FIELD The present invention relates to a support structure for a tube body in an apparatus for use, for example, by attaching the tube body to a tube sheet in a can body, and particularly to a breathable porous ceramics. The present invention relates to a support structure of a tube body for supporting a ceramic tube body such as a filter tube on a tube sheet.

“Prior Art and Problems Thereof” In recent years, various dust removers using a filter tube made of air-permeable porous ceramics have been proposed in order to remove dust contained in high-temperature exhaust gas. With these dust removers,
A plurality of tube plates are placed inside the can, and a filter cylinder is supported between the tube plates, and the dust-containing gas is fed to the inside of the filter tube or the outside of the filter tube. The dust is captured and removed by passing it through, and is taken out as clean gas.

In these dust removers, since the filter cylinder is made of ceramics and the can body and tube plate are made of metal, the difference in thermal expansion between the ceramics and the metal due to temperature rise and fall is absorbed, and the filter is used during installation work or use. It was necessary to have a structure that would not damage the tube. For this reason, the end of the filter tube, which is easily damaged, is held by a metal annular holder via a cushioning member, and the annular holder is connected via a metal pellows to the end of the tube sheet or the adjacent vertical filter tube. It has been devised such as connecting to the section.

FIG. 6 shows an example of the structure of a dust remover of this type proposed by the present applicant.

In FIG. 6, an inlet for dust-containing gas is provided above the can body 11 via a header (not shown), and a dust hopper (not shown) is provided below.

Inside the can body 11, in this example, three metal tube plates 1
2, 13, 14 are attached at a predetermined interval in the vertical direction,
An upper section partitioned by the tube sheets 12 and 13 and a lower section partitioned by the tube sheets 13 and 14 are formed.

Ceramic tubes 15 and 16 made of ceramics are arranged in the upper section and the lower section, respectively, with their axial directions being substantially vertical, and a tube plate position is provided so that the corresponding upper and lower filter tubes 15 and 16 communicate with each other. Connected and supported by.

The upper filter cylinder 15 is provided with a metallic ring-shaped holder 17 on the outer periphery of the upper end through a cushioning member (not shown) such as a heat-expandable mat, and above the ring-shaped holder 17 is a metal bellows. The lower edge of 18 is attached. The upper edge of the bellows 18 is connected to a metal flange 19, which is a tube sheet.
It engages with the upper edge of the 12 through holes.

On the other hand, a metallic ring-shaped holder 20 is attached to the outer periphery of the lower end of the filter tube 15 via a buffer member (not shown), and the ring-shaped holder 20 holds the outer circumference of the filter tube 15. 21 and
It consists of a support ring 22 fixed to the lower surface of the holding ring 21,
The outer periphery of the support ring 22 is a spherical surface having its center on the axis a of the filter cylinder 15. Further, a metal annular receiving seat 23 is attached to the through hole of the tube sheet 13, and the inner circumference of the annular receiving seat 23 is a spherical surface that coincides with the outer circumference of the support ring, and the spherical surface of the support ring 22 is The formed outer periphery is in spherical contact with the inner periphery that forms the spherical surface of the annular seat 23.

On the outer periphery of the upper end of the lower filter cylinder 16, a metal annular holder 17 and a metal bellows 18 are attached in the same manner as the filter cylinder 15, and the upper edge of the bellows 18 is the lower end of the filter cylinder 15. It is connected to a support ring 22 attached to the section. An annular holder 20 is attached to the outer periphery of the lower end portion of the filter cylinder 16 in the same manner as the filter cylinder 15, and the outer periphery of the support ring 22 of the annular holder 20 forming the spherical surface is the periphery of the through hole of the tube sheet 14. The spherical inner surface of the attached annular seat 23 is in spherical contact.

The inner diameter of the through hole of the tube sheet 12 is R ₁ , the outer diameter of the annular holder 20 attached to the lower end of the filter tube 15 is r ₁ , the inner diameter of the annular seat 23 of the tube sheet 13 is R ₂ , and the filter tube 16 is When the outer diameter of the annular retainer 20 attached to the lower end is r ₂ and the inner diameter of the annular seat 23 of the tube sheet 14 is R ₃ , R _{1
> R 1> R 2> r} 2> are such that the R _3.

Therefore, when the filter cylinders 15 and 16 are installed, for example, the annular seat 23 is previously fixed to the tube plates 13 and 14, and the flanges 19,
After connecting the bellows 18, the ring-shaped holder 17, the filter cylinder 15, the ring-shaped holder 20, the bellows 18, the filter cylinder 16, and the ring-shaped holder 20 in this order, first, the filter cylinder 16 is attached to the tube plates 12 and 13. It is inserted from above through the through hole, and the support ring 22 of the annular holder 20 attached to the lower end of the through hole is brought into contact with and supported by the annular seat 23 of the tube sheet 14. At the same time, the filter tube 15 is inserted through the through hole of the tube sheet 12 from above, and the support ring 22 of the annular holder 20 attached to the lower end of the filter tube 15 is inserted.
Is brought into contact with and supported by the annular seat 23 attached to the tube sheet 13, and finally the flange 19 is engaged with and fixed to the upper edge portion of the tube sheet 12.

Furthermore, the tube sheets 12, 13, and 14 are thicker than those shown in the drawings,
By providing a cooling medium chamber in which a cooling medium flows, and indirectly cooling metal bellows, annular holders, etc. by heat radiation, it is possible to process dust-containing gas in a temperature range exceeding the heat resistant temperature of metal members. A usable system can be configured.

Thus, in this support structure, the filter cylinders 15 and 16 can be installed simply by inserting them through the through holes in the upper tube sheet, and the filter cylinders 15 and 16 can be assembled and disassembled very easily. Further, in this support structure, the support ring 22 of the annular holder 20 and the annular receiving seat 23 are in spherical contact with each other, and the bellows 18 allows the filter tubes 15 and 16 to slightly tilt, so that the tube sheet 12, Even if the axis between the through holes of 13 and 14 is slightly displaced from the vertical line, excessive bending stress does not occur in the filter cylinder made of brittle material, and good sealing property is obtained .

On the other hand, clean gas extraction pipes 24 are attached to the peripheral wall of the can body 11 corresponding to the upper section and the lower section. A throat portion 25 is formed in the clean gas extraction pipe 24, and an ejector nozzle 26 that opens toward the upstream side of the clean gas flow path is disposed near the downstream of the throat portion 25.

In this dust remover, the dust-containing gas is introduced from above the can body 11 and sequentially passed through the filter tubes 15 and 16 from above. The dust-containing gas flows inside the filter cylinders 15 and 16, while the gas passes through the wall and flows out to the outside of the filter cylinders 15 and 16 as clean gas.
At this time, the dust in the dust-containing gas is trapped on the inner wall surfaces of the filter cylinders 15 and 16, and a considerable part of the dust accumulated on the inner wall surfaces is separated from the wall surface by its own weight and falls downward, resulting in a can body. Collected in the dust hopper provided at the bottom of 11. Filter tube 15,
The clean gas flowing to the outside of 16 is taken out of the device through the clean gas take-out pipe 24.

If such a dust collecting operation is continued, dust accumulated on the inner wall surfaces of the filter cylinders 15 and 16 will increase the gas passage pressure loss and reduce the processing capacity of the dust remover. Then, after a suitable time, a compressed gas is ejected from the ejector nozzle 26 to perform a backwash operation.

The gas ejected from the ejector nozzle 26 entrains the surrounding gas in the throat portion 24 and flows into the can with pressure waves, and the gas pressure outside the filter cylinders 15 and 16 is lower than the pressure inside each. A few hundred to 15,000 mm of water is raised to a level as high as a water column to create a momentary gas flow that passes through the walls of the filter tubes 15 and 16 from the outside to the inside, and removes dust accumulated on the inner walls of the filter tubes 15 and 16. .

In order to perform effective backwashing operation, the compressed gas pressure should be 1.2 times or more the gas pressure (absolute pressure) in the can, and especially the critical pressure ratio at which the gas flow velocity at the nozzle exit exceeds the sonic speed. Gas ejection mode is within 1 second, preferably 0.5
The compressed gas may be ejected from the ejector nozzle for a substantially instantaneous time using a high-speed response valve that is fully opened to fully closed within a second. In order to obtain an effective backwashing gas pressure with a compressed gas having a critical pressure ratio or higher, the tip of the ejector nozzle 26 is preferably a so-called Laval nozzle.

In addition, such backwashing operation is actually performed alternately for each of the compartments in the can 11, and even during the backwashing operation of one compartment, the dust collecting operation is performed in the other compartments. To ensure that the dust collection operation is not completely interrupted.

It has been found that when the backwash gas pressure during backwash operation is increased in the above dust remover, the following problems occur. That is, in each of the filter tubes 15 and 16, the annular holder 20 attached to the lower end portion is provided with an annular seat 23 provided around the through holes of the tube sheets 13 and 14.
Since the upper ends of the filter tubes 15 and 16 are connected to the upper tube plate or the filter tube via the bellows 18, the filter tubes 15 and 16 can be slightly displaced in the axial direction (up and down direction). It is possible. In this state, for example, if backwash gas is blown into the lower section, the gas pressure in that section becomes higher than the gas pressure in the upper section. This gas pressure applies an upward pressure to the annular holder 20 provided at the lower end of the filter cylinder 15 arranged above, and when the upward force exceeds a certain value due to this pressure, the filter cylinder 15 is instantaneously moved. Will be pushed up.

When the filter cylinder 15 is pushed up in this way, the backwash gas pressure escapes to the upper compartment, which not only adversely affects the dust collection operation in the upper compartment, but also reduces the effect of the backwash operation. Further, when the bellows 18 attached to the filter cylinder 15 via the annular holder is momentarily compressed, or when the backwash operation is completed and the filter cylinder 15 falls, the filter cylinder 15 and the annular holder. A shearing force or a shocking force acts on the attachment portion of 17 and the attachment portion of the filter cylinder 15 and the annular holder 20.

The filter cylinder 15 made of porous ceramics, particularly the mounting position of the annular holder, is extremely weak against such a force, and a crack or crack often occurs.

“Object of the Invention” In view of the above-mentioned problems of the conventional art, an object of the present invention is to provide a tube to a can body mainly composed of a multi-stage compartment having an intermediate tube plate connecting tube bodies above and below the tube sheet. When attaching the body, the tube body can be supported and installed on each corresponding tube sheet by the operation of inserting multiple tube bodies in the can body through the through holes of the uppermost tube sheet in a state of communicating with each other. In addition, the axial movement of the tubular body due to the lifting of the filter cylinder support portion due to the pressure of the backwash gas is restricted, and a good sealing property between the tubular body and the tubular plate can be obtained. To provide a support structure.

[Structure of the Invention] A support structure for a pipe body according to the present invention is configured such that an annular holder is attached to an outer periphery of an end portion of the pipe body, and an annular pedestal is formed at a peripheral edge of a through hole of a tube plate provided substantially horizontally. In a support structure of a pipe body in which the annular holder is abutted and supported on the annular pedestal by arranging the axial direction substantially vertically, the outer periphery of the annular holder is in contact with the annular pedestal over the entire circumference. And the intermittent contact portion are formed so that the contact portion over the entire circumference is on the lower side and the intermittent contact portion is on the upper side, and the lower inner circumference of the annular pedestal covers the entire circumference. An annular receiving portion that contacts the contact portion and a pressing portion that engages with the intermittent contact portion are formed so that the annular receiving portion is on the lower side and the pressing portion is on the upper side. The intermittent contact portion of the holder is provided with a notch that can be inserted from above, and the contact is performed over the entire circumference. When the annular holder is rotated in a state of being in contact with the annular receiving portion, a pressing portion with which the intermittent contact portion engages is formed on the annular pedestal side, and the contact portion extends over the entire circumference. Further, at least one contact surface of the annular receiving portion and at least one contact surface of the intermittent contact portion and the pressing portion are formed into a spherical surface.

As a preferred aspect of the present invention, a spherical surface formed on at least one contact surface of the contact portion and the annular receiving portion over the entire circumference, and a contact surface of at least one of the intermittent contact portion and the pressing portion. And the spherical surface formed at have respective centers at substantially the same position on the axial center of the tubular body, and the respective center positions are at least one of the contact portion and the annular receiving portion over the entire circumference. Is above the upper edge of the spherical surface formed on the contact surface, and is below the upper edge of the spherical surface formed on the contact surface of at least one of the intermittent contact portion and the pressing portion.

As another preferred aspect of the present invention, both the contact portion and the pressing portion formed on the annular pedestal side over the entire circumference are conical surfaces, and the contact formed over the entire circumference formed on the annular holder side. Both the portion and the intermittent contact portion are spherical.

As another preferred aspect of the present invention, the contact surfaces of the contact portion and the annular receiving portion over the entire circumference are both spherical surfaces, and the contact surfaces of the intermittent contact portion and the pressing portion are both spherical surfaces. is there.

In another preferred aspect of the present invention, the tubular body is made of ceramics.

In another preferred aspect of the present invention, the tubular body is a filter cylinder made of a gas permeable porous ceramics.

To attach a tube with the tube support structure according to the present invention,
The tubular body connected so as to communicate in advance descends from the through hole of the uppermost tube sheet toward the through hole of the lower tubular sheet, and the annular holder attached to the lower end of the tubular body and the tubular sheet. And the annular pedestal attached to the peripheral edge of the through hole.

At this time, even if the intermittent contact portion is provided so as to project from the outer periphery of the annular holder, it can be inserted into the inside thereof from the notch portion provided in the holding portion of the annular pedestal.

After the annular holder is thus inserted into the annular pedestal, the abutment portion formed on the outer periphery of the lower portion of the annular holder over the entire circumference is the annular portion formed on the inner periphery of the lower portion of the annular pedestal. The tube portion is supported by contacting the receiving portion, and at the same time, the upper and lower sections of the tube sheet are separated with good sealing property. At this time, since at least one of the contact surfaces of the abutting portion over the entire circumference of the annular holder and the annular receiving portion of the annular pedestal is spherical, it is preferable that the tubular body is slightly inclined with respect to the tubular plate. The sealing property can be maintained.

In addition, when the annular holder is rotated together with the tubular body in a state where the abutment portion over the entire circumference is in contact with the annular receiving portion, the intermittent abutment provided on the outer periphery of the annular holder is provided. The portion enters the not-cut inner side of the notched pressing portion above the annular pedestal, and the pressing portion engages with the upper side of the intermittent contact portion.

Therefore, the movement of the pipe body can be restricted even with respect to the upward lifting force such as the pressure of the backwash gas. In this case as well, at least one of the contact surfaces of the intermittent holding portion of the annular holder and the pressing portion of the annular pedestal forms a spherical surface, so that even if the tubular body is slightly inclined with respect to the tube plate, the intermittent holding portion The contact portion always fits in the not-cut inner side of the holding portion in a conforming state, and can be engaged so as to hold down against the upward lifting force.

In this way, the tubular bodies are lowered from the upper through-hole in a state of being connected to each other, and the annular holders attached to the respective tubular bodies are brought into contact with the corresponding annular receiving seats of the respective tube plates to rotate. By a simple operation, the tube body and the tube plate are supported with a good sealing property so that they do not move upward even if they are lifted upward.

In a preferred aspect of the present invention, at least one contact surface of the contact portion and the annular receiving portion over the entire circumference is formed in a spherical shape, and at least one contact surface of the intermittent contact portion and the pressing portion. Are formed into spherical surfaces, and all of these spherical surfaces have their respective centers at approximately the same location on the axial center of the tubular body, and the respective centers are the abutting portion and the annular shape over the entire circumference. A spherical surface that is at the same height as or above the upper edge of the spherical surface formed on at least one contact surface of the receiving portion and that is formed on the contact surface of at least one of the intermittent contact portion and the pressing portion. It is below the upper edge. According to this aspect, even if the tubular body is supported while being inclined with respect to the tubular sheet, the matching between the intermittent contact portion of the annular holder and the holding portion of the annular pedestal is optimized, and the tubular body is It is possible to secure the locking effect that works to press against the detachment and lifting force of.

Further, in a preferred aspect of the present invention, the contact surfaces of the contact portion and the annular receiving portion over the entire circumference are both spherical surfaces, and the contact surfaces of the intermittent contact portion and the pressing portion are both spherical surfaces. In this aspect, since the contact surfaces contacting each other are spherical surfaces, it is easy to obtain accuracy, and the contact surfaces are less likely to be damaged as compared with the case where the corners and the spherical surfaces are in contact with each other.

It is preferable to apply the support structure of the tubular body according to the present invention to the lower end portion of each tubular body when the tubular body such as a filter cylinder is arranged in a substantially vertical direction and is connected in multiple stages via the tubular plate. At the lower end of the lowermost tube, it does not float up due to the pressure of the backwash gas, so its application may be omitted.

Although the embodiment of the present invention has been described above focusing on an example applied to a porous ceramic filter tube, the present invention relates to a high temperature heat exchanger using a ceramic tube or an apparatus using a metal tube body. It can be preferably used as a support structure for a tubular body.

[Examples] Examples of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of a support structure for a tubular body according to the present invention. In this embodiment, the present invention is applied to a support structure for a porous ceramic filter cylinder in a dust remover. Therefore, although the pipe will be described below as a filter cylinder, the scope of application of the present invention is not limited to the filter cylinder in the dust removing device, and can be applied to the case where the pipe is made of metal, such as a heat exchanging device and other various pipes. It is applicable to a support structure. In the figure, the same parts as those shown in FIG. 6 described above are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, the upper end of the filter cylinder 15 is engaged with and supported by the upper edge of the through hole of the tube sheet 12 via the annular holder 17, the bellows 18 and the flange 19, and the lower end of the filter cylinder 16 is annular. Holder 20
The structure in which it is abutted and supported by the annular seat 23 of the tube sheet 14 via is the same as in FIG.

The support structure of the filter cylinder according to the present invention includes a lower end portion of the filter cylinder 15 and a tube plate.
It is also applied to the support between the tube sheet and the tube sheet which has a section for performing the backwashing operation, such as between the sheet and the sheet. That is, the holding ring 31 is attached to the outer periphery of the lower end portion of the filter cylinder 15 via a cushioning member (not shown) such as a heat-expandable mat, and the support ring 32 is fixed to the lower surface of the holding ring 31 to hold them. The ring 31 and the support ring 32 form an annular holder 30. In FIG. 1, the holding ring 31 and the support ring 32 are separately manufactured and then fixed to each other, but they may be integrally formed.

An annular pedestal 33 is attached to the peripheral edge of the through hole of the tube plate 13.
It is preferable that the annular pedestal 33 is formed separately from the tube sheet 13 and attached to the tube sheet 13 in order to maintain processing accuracy, but the annular pedestal 33 is previously formed integrally with the tube sheet 13. You can also leave it.

As an example of the most preferable structure of the present invention, an annular holder 30
2 and 3 show the structures of the support ring 32 and the annular pedestal 33 of FIG.
Shown in the figure. In the figure, the outer periphery of the lower part of the support ring 32 is a contact portion 34 formed of a spherical surface having a radius R _L centered on a point P on the axis a of the filter cylinder 15. Further, on the outer periphery of the upper portion of the support ring 32, there are intermittent abutting portions 35 provided outwardly at a plurality of locations along the circumferential direction, and the circumferential surface of the intermittent abutting portions 35 is centered on the point P. It is a spherical surface with radius R _H. The intermittent contact portions 35 are generally preferably formed at a plurality of positions in consideration of the balance of the applied force.

On the other hand, the lower inner circumference of the annular pedestal 33 attached to the tube sheet 13 is
The annular receiving portion 36 is a spherical surface having a radius R _L centered on the point P and is in spherical contact with the abutting portion 34 over the entire circumference. The upper portion of the annular pedestal 33 has a number of cutout portions 37 corresponding to the contact portions 35 that are intermittent when viewed from above, and the intermittent contact portions 35 can be inserted from above through the cutout portions 37. There is. Ring pedestal
A portion other than the cutout portion 37 on the upper portion of 33 is a holding portion 38 extending inward. The inner peripheral surface of the pressing portion 38 is a spherical surface having a radius R _H centered at the point P and makes spherical contact with the peripheral surface of the intermittent contact portion 35.

In the above, the radius R _H of the spherical surface of the contact portion 35 and the pressing portion 38, which are intermittent, and the radius R _L of the spherical surface of the entire contact portion 34 and the annular receiving portion 36, so that the support ring 35 can be inserted, R _H > R _L In addition, the minimum radius L in the holding portion 38 of the annular pedestal 33 is L
₁ and the maximum radius L of the part excluding the intermittent contact part 35 of the support ring 32
₂ is such that L ₁ > L ₂ . As a result, the support ring 32 can be inserted into the annular pedestal 33 without hitting the pressing portion 38 except the intermittent contact portion 35. In this case, the maximum radius R _H of the intermittent contact portion 35 is made larger than L ₁ so that the pressing is effective, but the intermittent contact portion 35 is
It can be inserted inside through the notch 37.

The point P is located above the surface b passing through the upper edges of the entire circumference contact portion 34 and the annular receiving portion 36, and is higher than the surface c passing through the upper edge portions of the intermittent contact portion 35 and the pressing portion 38. It is supposed to be below. When the point P is below the surface b, the upper edge of the annular receiving portion 36 projects inward, so that the full-circumference contact portion 34 cannot be inserted, and the point P is above the surface c. The pressing portion 38 does not engage above the intermittent contact portion 35.

In this support structure, the filter cylinder 15 to which the support ring 32 is attached is lowered from above, the intermittent contact portion 35 and the cutout portion 37 are aligned, and the intermittent contact portion 35 is cut out. The support ring 32 is inserted into the annular pedestal 33 so as to pass through. As a result, the entire circumference contact portion 34 and the annular receiving portion 36 make spherical contact, and the filter cylinder
15 is supported in contact with the tube sheet 13. When the filter cylinder 15 is rotated in this state to rotate the support ring 32, the intermittent contact portion 35 enters the not-cut inner portion of the pressing portion 38, and the pressing portion 38 is intermittent. Engage 35 by pressing it in from above. At this time, the intermittent outer peripheral surface of the contact portion 35 and the inner peripheral surface of the pressing portion 38 make spherical contact, but for a normal purpose of use, even if there is a slight gap between them, there is no particular problem.

The contact surface between the abutting portion 34 and the annular receiving portion 36 over the entire circumference has an axis a.
Since it is a spherical surface with radius R _L centered on the upper point P,
Even when the filter tube 15 is slightly tilted with respect to the tube sheet 13 during assembly or during use, the filter tube 15 closely contacts without a gap, so that the support ring 32 can be easily inserted, and good sealing property and support without rattling can be obtained. . Further, since the contact surface between the intermittent contact portion 35 and the pressing portion 38 is also a spherical surface having the same point P as the center as described above, when the filter tube is rotated, the filter tube 15 is slightly inclined. Also, the intermittent contact portion 35 enters the inside of the pressing portion 38 without difficulty. Further filter cylinder
When an upward force is applied to 15, the contact portion 35 intermittently held by the pressing portion 38 can be held without rattling even if it is slightly inclined.

4 and 5 show another embodiment of the support structure of the present invention. In the figure, the substantially same parts as those in the above embodiment are designated by the same reference numerals.

In the support structure shown in FIG. 4, the structure of the annular pedestal 33 is the same as that of the above embodiment, but the structure of the support ring 42 is different. Support ring 42
Has a cylindrical shape as a whole, and a corner portion of the outer periphery of the lower end thereof is a contact portion 44 extending over the entire circumference. Therefore, the contact portion 44 over the entire circumference makes line contact with the spherical annular receiving portion 36 of the annular pedestal 33. Further, the intermittent contact portion 45 is formed of a tongue-shaped outer periphery having a cylindrical surface, and the arc-shaped corner portion of the upper end outer periphery makes a line contact with the inner periphery of the pressing portion 38 forming the spherical surface of the annular pedestal 33. ing.

In the support structure of FIG. 5, the structure of the support ring 32 is the same as the embodiment of FIGS. 2 and 3, but the structure of the annular seat 43 is different. The annular seat 43 is an annular rib that protrudes inward from the inner circumference of the lower portion.
The inner peripheral corner portion of the rib 49 has an annular receiving portion 46.
The annular receiving portion 46 is in line contact with the abutting portion 34 that surrounds the support ring 32 and forms the spherical surface. Further, the pressing portion 48 is formed by a portion having a notch protruding inward so that the inner peripheral surface forms a cylindrical curved surface, and the lower edge inner peripheral corner portion of the pressing portion 48 has a support ring 32.
Is in line contact with the peripheral surface of the intermittent contact portion 35 forming a spherical surface.

Also in the case of the embodiment shown in FIGS. 4 and 5, even if the filter cylinder 15 is slightly inclined, the contact portion 44 (or 34) and the annular receiving portion 36 (or 46) are formed over the entire circumference. Abutting parts that are intermittent or intermittent
Since the 45 (or 35) and the pressing portion 38 (or 48) are always in a close contact or uniform narrow gap, a good sealability and a rattling-free support structure can be obtained. Further, the abutting portion 45 (or 35), which is intermittent even if the filter cylinder is tilted slightly, fits comfortably into the uncut inner portion of the holding portion 38 (or 48).

4 and 5 show an example in which the spherical portion and the corner portion are in line contact with each other, but the corner portion may be chamfered or rounded, or the spherical surface on the annular receiving portion side may be changed to a conical surface to change the spherical portion. And the conical surface may be in line contact with each other. Also in these structures, it is preferable that the centers of the respective spherical surfaces contacting each other are substantially at the same position on the axial center, and the center positions are also preferably provided in the range described above with reference to FIG. .

In each of the above embodiments, the annular holder 30 is attached to the lower end of the filter tube 15, but as one application of the present invention, for example, the annular holder 30 is attached to the upper end of the filter tube 16, An annular pedestal 33 may be attached to the lower side of the plate 13 to support the annular holder 30 in the opposite direction so that the filter cylinder 16 is suspended and supported from the tube plate 13. In this case, an annular holder 17 and a bellows 18 are attached to the lower end of the filter cylinder 16 and the bellows 18 is connected to the lower tube sheet 14.

[Advantages of the Invention] As described above, if the present invention is applied to support the tube body on the tube sheet, the annular holder attached to the outer circumference of the tube element is brought into contact with the annular pedestal attached to the tube sheet. Just rotate
The tube can be engaged with and supported by the tube sheet. Then, not only the downward force due to the weight of the pipe body and the members attached to the pipe body, but also in the dust remover, the force such as the upward lifting of the filter tube support portion due to the pressure of the backwash gas is suppressed, and Axial movement can be restricted. Also, since it allows some inclination of the tube body with respect to the tube plate, it is easy and reasonably possible.
In addition, the tube body can be engaged with and supported by the tube sheet with good sealing property. Therefore, there is an effect that the construction period can be shortened and the labor for maintenance can be saved in the installation work of the device for attaching the tube group to the can body having the multistage tube sheet.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a support structure according to the present invention, and FIG. 2 is an end view taken along the line AA in FIG.
FIG. 3 is a partial sectional view showing an essential part of the supporting structure, and FIGS. 4 and 5 are partial sectional views showing other embodiments of the supporting structure according to the present invention. FIG. 6 is a cross-sectional view showing an example of the structure of the dust removing device that the present applicant has already proposed. In the figure, 11 is a can body, 12, 13, 14 are tube plates, 15 and 16 are filter tubes, 30
Is an annular holder, 31 is a holding ring, 32 and 42 are support rings, 33 and 43 are annular pedestals, 34 and 44 are abutting portions over the entire circumference, 35 and 45 are intermittent abutting portions, and 36 and 46 are An annular receiving portion, 37 is a notch portion, and 38 and 48 are holding portions.

Claims (6)

[Claims] 1. An annular holder is attached to an outer periphery of an end portion of a tubular body, an annular pedestal is formed on a peripheral edge of a through hole of a generally horizontally provided tube plate, and the axial direction of the tubular body is arranged substantially vertically. In a support structure for a tubular body in which the annular holder is abutted and supported on the annular pedestal, an abutting portion over the entire circumference in contact with the annular pedestal and an intermittent abutting portion are provided on the outer circumference of the annular holder. An abutting portion extending over the circumference is formed on the lower side, and an abutting abutting portion is formed on the upper side, and an annular receiving portion and the intermittent abutting portion abutting the abutting portion over the entire circumference are formed on the inner circumference of the annular base. The pressing portion that engages with the contacting portion is formed so that the annular receiving portion is on the lower side and the pressing portion is on the upper side, and the intermittent contacting portion of the annular holder is on the upper side of the pressing portion. Is provided with a notch that can be inserted from the contact portion over the entire circumference in contact with the annular receiving portion. When the shape-retaining tool is rotated, the intermittent contact portion is engaged with the pressing portion, and the intermittent contact portion and the contact surface of at least one of the annular receiving portion over the entire circumference and the intermittent contact portion are intermittent. A support structure for a tubular body, wherein at least one contact surface of the contact portion and the pressing portion is formed into a spherical surface. 2. A spherical surface formed on the contact surface of at least one of the contact portion and the annular receiving portion over the entire circumference, and a spherical surface formed on at least one contact surface of the intermittent contact portion and the pressing portion. And the spherical surface has respective centers at substantially the same positions on the axial center of the tubular body, and the respective central positions are at least one of the contact portion and the annular receiving portion over the entire circumference. It is above the upper edge of the spherical surface formed on the contact surface and below the upper edge of the spherical surface formed on the contact surface of at least one of the intermittent contact portion and the pressing portion. 1. The support structure for a tubular body according to 1. 3. The contact portion and the pressing portion formed on the annular pedestal side over the entire circumference are both conical surfaces, and the contact portion formed over the entire circumference formed on the annular holder side is intermittent with the contact portion. The support structure for a tubular body according to claim 2, wherein both of the contact portions are spherical surfaces. 4. The contact surfaces of the abutting portion and the annular receiving portion over the entire circumference are both spherical surfaces, and the contact surfaces of the intermittent abutting portion and the pressing portion are both spherical surfaces. 2. The support structure for a tubular body according to 2. 5. The tube body is made of ceramics.
4. The support structure for a tubular body according to any one of 4. 6. The support structure for a tube according to claim 1, wherein the tube is a filter cylinder made of air-permeable porous ceramics.