JPH10185287A - Intake/exhaust cylinder junction structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure airtightness in a flue gas cylinder work for processing combustion waste gas and an air conditioning duct work, and prevent air leakage from being produced even for repeated deformation stress such as earthquake, etc. SOLUTION: The present structure is adapted such that it consists of an inner pipe having an insertion part at least one end of which a packing stopping annular convex part (bellows) is formed at a proper position inwardly of the end part and an outer pipe having a pipe enlargement part formed at least one end thereof, and that the insertion part of the inner pipe is inserted into the pipe enlargement part of the outer pipe. In this case, the pipe enlargement part consists of a covering part where there are provided a conically slanting part, a coupled top part, and a surrounding stopper part, an inner diameter of which covering part is slightly larger than an outer peripheral diameter of the packing stopping bellows, and there is formed such a space that an annular resilient packing can be inserted between an inner peripheral surface of the conically slanting part and an outer surface of the bellows when the inner pipe is inserted into the outer pipe. Further, the annular resilient packing is inserted into the space part, and the pipe enlargement part of the outer pipe is covered with the bellows of the inner pipe, and hence the inner and outer pipes are brought into close contact through the annular resilient packing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a supply / exhaust tube required for air supply / exhaust air-conditioning duct construction and a smoke exhaust tube construction for treating combustion exhaust gas, and more particularly to a structure for ensuring airtightness and preventing earthquake. The present invention relates to a joint structure of a supply / exhaust cylinder which does not leak even against repeated bending stress such as vibration during use or the like.

[0002]

2. Description of the Related Art In the conventional air-conditioning duct construction and the construction of a flue-gas stack for treating combustion exhaust gas, the connection structure of the supply and exhaust pipes is as follows.
Typified by nipple joints and flange joints. The nipple joint is inserted into the pipes to be joined and connected to each other, then the nipple and the duct are fixed with screws to prevent separation, and the joint is caulked with a sealing material to prevent leakage It is common. However, this method is liable to cause leakage from the Yurumi due to the partial construction failure due to screws and aging, and there is no problem in a good work place, but in a work place where the work environment is not good,
There is a drawback that it is difficult to completely perform the caulking work, and furthermore, the leakage occurs due to cracks or the like due to the deterioration of the coking agent with time, and as a result, the leakage cannot be completely stopped. On the other hand, the flange joint attaches an angle flange to each end of the pipe to be joined by welding etc., interposes rubber packing between these angle flanges, and tightens and fixes with bolts and nuts. It takes time and effort to tighten bolts, does not contribute to labor saving on site work, it is difficult to fix uniformly to packing, and leakage is completely prevented depending on the bias of packing and tightening force used There was a drawback that you could not do that.

[0003] In order to improve the shortcomings of these connection joints, various improved joints have been developed and put into practical use. However, for example, for air conditioning duct joints,
Some are expensive or not easy to apply to both small and large diameter tubes,
There are drawbacks such as the inability to completely prevent air leaks, etc. The degree of freedom in handling is increased, and therefore, the bending due to the extension pipe, which has not been a problem in the past, and the airtightness related to the bending have become a problem.

[0004]

The present inventor has made various studies to solve the above-mentioned drawbacks and problems, and as a result, has completed the present invention. The object of the present invention is to provide a simple structure and airtightness. Provided is a joint structure of a supply / exhaust cylinder which can be sufficiently secured.

[0005]

As a means for achieving the above-mentioned object, the present invention forms a ring-shaped annular convex portion (bellows) at at least one end portion at an appropriate position inward of the end portion. And an outer pipe having an expanded portion formed at at least one end, wherein the insertion portion of the inner tube is inserted into the expanded portion of the outer tube. The expanded portion of the outer tube comprises a conical inclined portion, an expanded tube connecting portion connecting the connection top portion and the surrounding locking portion, the inner diameter of which is slightly larger than the outer diameter of the packing locking bellows, and the inner pipe. When the is inserted into the outer tube, a space is formed between the inner peripheral surface of the conical inclined portion and the outer surface of the bellows so that the elastic packing can be inserted. The expanded part of the pipe is It was capped and over's, a supply and exhaust pipe joint structure formed by close contact pressure via an annular elastic packing.
That is, in the present invention, a packing locking bellows is provided at the end of the inner tube to be joined, and a conical inclined portion, a connection top portion, and a surrounding locking portion are provided at the expanded portion of the outer tube to be joined thereto. Wear the bellows as if holding it, insert a ring-shaped elastic packing for air leak prevention into the space formed by the outer peripheral surface of the bellows and the inner peripheral surface of the conical sloped part,
This annular elastic packing is pressed against and adhered to the packing locking bellows on the inner peripheral surface of the expanded portion to maintain airtightness.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The material of the supply / exhaust tube in the present invention is used for ordinary duct pipes, spiral pipes, and the like, and may be any of stainless steel plates, zinc steel plates, copper plates, and the like, and the thickness of the material is 0.2 mm. The cross-sectional shape of the packing locking bellows may be any of a semicircular shape, a semi-elliptical shape, a trapezoidal shape, a single trapezoidal shape, and the like, and the height is approximately 5 mm to 20 mm, and the width is Is 5m
m to about 25 mm. The position where the bellows is formed differs depending on the size of the pipe, but is usually within about 10 to 50 mm from the end.

In the present invention, an expanded portion at the end of the outer tube is provided with an expanded tube mounting portion for mounting a packing locking bellows of the inner tube, a conical inclined portion, a continuous top portion, and a surrounding locking portion. One of the features of the present invention is that the inner peripheral surface has a conical inclination (conical inclination) due to the conical inclination portion, and there is a dimensional difference between the inner diameter of the inner tube and the inner diameter of the outer tube. Even so, an effect such as airtightness is exhibited. That is, in the present invention, by having a conical inclined shape portion, pressure contact airtightness with the annular elastic packing can be obtained,
Moreover, the tightness of the ring-shaped fastener is further improved in airtightness. Further, because of this structure, as the supply pressure or the exhaust pressure becomes higher, the pressing force acts on the back surface of the annular elastic ring, and the airtightness is further improved. The conical slope may have a linear slope, a gentle outer arc or an inner arc, and the angle of the conical shape with respect to the horizontal is determined by the diameter of the elastic annular packing and the height of the protrusion. In the present invention, it is particularly preferable that the shape of the conical inclined shape portion is a linear inclination. Furthermore, in order to absorb the bending stress, it is necessary that the distance between the tip of the insertion portion and the bellows should not be longer than the depth of the expanded crown portion.

[0008] Since the connection structure of the joint structure of the present invention is completed simply by inserting the insertion portion of the inner tube into the expansion tube of the outer tube in the same manner as in a normal sword eye structure, the operation is extremely easy. By providing the surrounding locking portions at a plurality of distal ends along the longitudinal direction of the tube at the distal end of the crown portion and notching, the inner tube can be more easily inserted into the outer tube. Note that the remaining portion cut out by the slit is referred to as a leading end guide portion. The width and number of slits vary depending on the diameter of the tube, but usually the width of the slit is about 1 to 150 mm, the number of slits is about 3 to 12 and the length of the slit is locked from the tip. Department. It is preferable that a valley groove is provided on the outer periphery of the distal end guide portion, and a ring-shaped fastener is fitted into the valley groove and fastened and fixed. By adjusting the tightening force of this tightening ring, the pressure applied to the elastic annular packing by the conical inclined portion on the inner surface of the expanded portion increases.
The joining portion is more firmly joined by pressure bonding, and the function of preventing air leakage increases. By adjusting the relationship between the insertion length of the inner tube having the bellows and the outer tube expanding portion, a structure capable of absorbing the bending can be formed.

Further, when the insertion length of the tip of the inner pipe having the bellows is secured to a sufficient length inside the outer pipe beyond the expanded portion of the outer pipe, an appropriate length of the double pipe portion of the outer pipe and the inner pipe is obtained. It is possible to form a groove on the inner peripheral surface of the outer tube at an appropriate position and insert an O-ring into this groove. It is preferable that the O-ring is provided at a distance of about 20 to 100 mm from the inner end of the expanded portion. When such an O-ring is joined to the annular elastic ring, bending of the connecting portion is prevented. In addition, even when repeatedly subjected to bending stress such as an earthquake or vibration during use, for example, there is no air leakage, and the effect of preventing bending stress is improved. Therefore, such a joint structure can prevent leakage of a gas that presents a dangerous situation due to leakage and drainage that has condensed in the pipe.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. Example 1 Joint structure of a bending force absorbing joint FIG. 1 to FIG. 3 are explanatory views showing a joint structure between an exhaust pipe A and an exhaust pipe B. FIGS. 1A and 1B are side views of an exhaust pipe A and an exhaust pipe B that constitute a joint portion. FIG. 1A is a side view of the exhaust pipe A, and FIG. (C) is an enlarged view showing the configuration of the tube expanding section.
The exhaust pipe A has a bellows 3 formed on the inner pipe 1 to form a plug-in section 2 up to the tip, and the exhaust pipe B has a conical expanded section at the end of the outer pipe 1 'following the expanded pipe mounting section 4. The outer tube 1 ′ includes an inclined shape portion 5, a connection top portion 6, and a surrounding surrounding locking portion 8.
The tip of the bellows 3 is partially notched by a slit 12, a tip guide piece 10 is provided, a valley groove is provided on the outer periphery of the guide piece 10, and a fastening fitting 7 is provided in the valley groove. Is installed. Due to the presence of the distal end guide piece formed at the end of the outer tube 1 ′, the insertion of the expanded pipe crown into the bellows 3 can be performed smoothly and reliably. The inner tube 2 is inserted into the outer tube 1 ′ and joined to form a hammer-eye portion. This state is shown in FIGS. 2 and 3, and FIG. 3 is a view in which the connecting portion is cut in the axial direction, and shows the relationship between the bellows portion and the expanded portion. (A) is a front view of the expanded portion viewed from the direction A, and (b) is a side view. A bellows 3 is leveraged to tighten the bellows 3 by a clamp 7 attached to a valley groove on the outer periphery of a guide piece provided in connection with the surrounding locking portion 8 of the exhaust tube B, thereby preventing the sneaky eye portion from coming off and the bellows. The airtightness of the annular elastic ring 9 inserted in the space defined by the outer peripheral surface of the inner ring 3 and the inner peripheral surface of the conical inclined portion 5 is increased. (A) In the figure, bellows 3
The number and width of the distal end guide pieces 10 having the pressure are determined by the relationship between the tightening force of the bellows 3 and the ease of insertion. As shown in FIG. 3, the inner peripheral surface of the conical inclined portion 5 of the expanded portion holding the annular elastic ring 9 and the bellows 3 is characterized by having a conical inclined shape (conical shape). The inclination angle of the (conical) horizontal line is determined by the relationship between the diameter of the annular elastic ring 9 and the height of the bellows 3. In particular, in order to absorb the bending stress, it is necessary that the distance between the tip 2 of the inner tube 1 and the bellows 3 does not become longer than the depth of the expanded portion, which is one of the features of the present invention.

Embodiment 2 Double Seal Type Joint Joining Structure FIGS. 4 to 6 are explanatory views of a double seal type joint. FIG. 4 is a structural view of a squeeze portion of the exhaust pipe joint. In the exhaust pipe A, a bellows 3 is formed on the inner pipe 1 to form an insertion section 2 up to the tip. The length of the insertion portion 2 is set to be long enough to reach the O-ring mounting groove 13 provided in the expanded pipe mounting portion 4 of the exhaust pipe B. The exhaust pipe B is an outer pipe 1 ′ of a hammer eye part, and an expanded pipe part at an end thereof is
The expanded pipe mounting portion 4, the conical inclined shape portion 5, the continuous top portion 6, and the surrounding surrounding locking portion 8 are formed, and a structure for holding the bellows 3 of the inner tube 1 is formed. The clamp 7 is attached to a valley groove on the outer periphery of the distal end guide piece 10 which forms the distal end of the expanded portion. The bellows 3 is used as a lever to secure the inner elastic ring 9 while preventing the hammer eye from coming off. Increase airtightness. FIG. 5 is a connection diagram of the inner pipe 1 and the outer pipe 1 ′.
The joint structure has a continuous top portion 6, a bellows 3, a fastening member 7, and an O-ring groove 13 necessary for a double seal. FIG. 5 (a) is a front view of the expanded portion viewed from the direction of arrow A. A slit is formed at the end of the outer tube, a part of the slit is cut out, and the inner tube 1 holds the bellows 3 and is surrounded and locked. The guide piece is configured so that the fastening fitting can be easily attached to the portion. Guide piece 1
The number and width of 0 are determined by the relationship between the tightening force of the bellows 3 and the ease of insertion. FIG. 6 is a side view in which the connecting portion is cut in the axial direction, and shows a relationship between the bellows portion 3 and the expanded portion.
The clearance of the double sealing portion between the inner pipe and the outer pipe is about 0.5 to 2.0 mm, and the annular elastic ring 9
One of the features of the present invention is to have a conical inclined portion such as a connection top portion holding the bellows 3 and the conical inclined shape portion. The angle of the conical inclined portion is determined by the diameter of the annular elastic ring 9 and the bellows 3. Is determined by the relationship with the height of In particular, the features of this joint structure are that airtightness can be doubled, and that the connecting portion between the annular elastic ring and the O-ring can be prevented from being bent, which can be achieved by supporting or adjusting fittings such as piping spacers. Can be saved. This joint structure can prevent leakage of gas that presents a dangerous situation due to leakage and drain that has condensed in the pipe. By having the conical inclined portion, airtight contact with the annular elastic packing can be obtained, and the airtightness can be further improved by tightening the ring-shaped fastener. Also, due to the structure, the higher the supply pressure or exhaust pressure, the more the pressurizing action acts on the back surface of the annular elastic packing, so that the airtightness can be further improved.

Embodiment 3 Joint Connection Structure of Spiral Duct FIGS. 7 to 9 are explanatory views of a joint connection structure for connecting circular ducts including the spiral duct 15. FIG. 7 is a diagram showing the configuration of the joint portion for connecting the circular duct. The insertion ring is a component to be inserted into the circular duct, and the insertion portion 2 has a tip portion inserted into the cover ring 1 ′, and the bellows 3 has a cover ring. Holding part. The covering ring is an outer tube 1 ′ of a sword eye portion, and the expanding portion forms an expanding crown portion 4, a conical inclined portion 5, a continuous top portion 6 and an encircling surrounding locking portion 8, and the bellows 3 of the insertion ring is formed. To embrace the structure. Attach the clamp 7 to the valley groove formed at the end of the covering ring, and lever up the bellows of the insertion ring 3 to prevent detachment of the squeeze eye and to reduce the airtightness of the annular elastic ring of the interior. Enhance. 8 (a) is a front view of the covering ring viewed from A, and FIG. 8 (b) is a side view thereof. The joining portion is composed of a continuous top portion 6, a bellows 3 of the insertion portion, and a fastening member 7 for the covering ring. As shown in FIG. 1A, the covering ring has a tip guide piece 10 holding the bellows 3 of the insertion portion. The number and width of the guide pieces 10 are determined by the relationship between the force for tightening the bellows 3 of the insertion portion and the ease of insertion. FIG. 9 is a view in which the joint connection portion is cut in the axial direction, and shows a relationship between the insertion portion and the covering ring. The expanded portion holding the annular elastic ring 9 inserted between the insertion portion and the cover ring and the bellows 3 of the insertion portion is characterized by having a conical inclined shape portion such as 5, and this conical inclined shape portion. Is determined by the relationship between the diameter of the annular elastic ring 9 and the height of the bellows 3. In particular, in order to absorb the bending stress, it is necessary that the distance between the tip 2 of the insertion portion and the bellows 3 does not become longer than the depth of the expanded portion of the covering ring, which is also a feature of the joint.

[0013]

As is apparent from the above description, the joint structure of the present invention improves on the drawbacks of various developed simple connection joints. In other words, it provides a joint structure that blocks even a small leak and does not leak even if it is subjected to repeated bending stress such as an earthquake or vibration during use, and also achieves labor saving in connection in terms of construction work. It is.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a joint structure for absorbing a bending force of an exhaust cylinder according to a first embodiment of the present invention;

FIG. 2 is an explanatory diagram of a joint structure for absorbing a bending force of an exhaust cylinder according to a first embodiment of the present invention;

FIG. 3 is an explanatory view of a joint structure for absorbing a bending force of an exhaust pipe according to a first embodiment of the present invention;

FIG. 4 is an explanatory view of a double seal type joint joining structure of an exhaust pipe according to Embodiment 2 of the present invention.

FIG. 5 is an explanatory view of a double seal type joint joining structure of an exhaust pipe according to Embodiment 2 of the present invention.

FIG. 6 is an explanatory view of a joint structure of a double seal type joint of an exhaust pipe according to a second embodiment of the present invention.

FIG. 7 is an explanatory view of a joint structure of a spiral duct according to a third embodiment of the present invention.

FIG. 8 is an explanatory view of a joint structure of a spiral duct according to a third embodiment of the present invention.

FIG. 9 is an explanatory view of a joint structure of a spiral duct according to a third embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 insertion-side exhaust tube or insertion ring 1 ′ expansion-portion-side exhaust tube or cover ring 2 tip of insertion-side exhaust tube or insertion ring 3 bellows 4 expansion-tube capping portion 5 conical inclined shape portion 6 connection top portion 8 surrounding Locking portion 7 Clamping fitting 9 Annular elastic ring 10 Tip guide piece 11 Slit 12 Slit 13 O-ring insertion groove 15 O-ring 16 Spiral duct tube

Claims (4)

[Claims] 1. An inner tube having an insertion portion having at least one end portion formed with an annular convex portion (bellows) for packing locking at an appropriate position inward of the end portion, and at least one end portion having an insertion portion. In an air supply / exhaust tube joining structure comprising an outer tube having a formed expanded portion and an insertion portion of the inner tube inserted into the expanded portion of the outer tube, the expanded portion of the outer tube has a conical inclined portion and a connection top. The inner diameter is slightly larger than the outer diameter of the packing locking bellows, and when the inner pipe is inserted into the outer pipe, the inner circumference of the conical inclined portion is formed. A space is formed between the surface and the outer surface of the bellows so that the annular elastic packing can be inserted.The annular elastic packing is inserted into the space, and the expanded portion of the outer tube covers the bellows of the inner tube, Close pressure through annular elastic packing Supply / exhaust cylinder joining structure that comes in contact. 2. The air supply / exhaust tube joint according to claim 1, wherein a plurality of slits are provided in a longitudinal direction of the surrounding locking portion of the pipe from a tip end of the expanded pipe to facilitate insertion of the outer pipe into the inner pipe. Construction. 3. The air supply / exhaust tube joint according to claim 1, wherein an O-ring fitting groove is provided on an inner peripheral surface of the outer pipe corresponding to a position between an end of the inner pipe and the bellows. Construction. 4. A guide piece provided with a valley groove at the outer periphery of the tip of the surrounding locking portion, and a ring-shaped fastener is fitted into the valley groove and fixedly fastened. 1 to 3
Supply / exhaust cylinder joint structure described.