JP3134985B2 - Duct fittings for air conditioning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for an air conditioning duct provided in a building or the like.

[0002]

2. Description of the Related Art In offices, factories, and other buildings where a large number of people repeat daily work, almost all cases are equipped with air-conditioning equipment in order to improve the livability and improve efficiency. It is an indispensable process during construction. As is well known, when the floor of a building has been formed, the necessary air-conditioning ducts must be installed between the floor and ceiling according to the layout of the living quarters before the ceiling of the lower floor is attached to the building. The process of piping in the hollow part of the above is set.

Needless to say, in order to exert an air-conditioning effect on all areas of a large living area, it is necessary to form a pipe by connecting a large number of air-conditioning duct pipes to each other. Typical examples of air-conditioning duct pipes include a cylindrical single pipe in which a stainless steel sheet is deformed into a circular cross-section by roll bending, etc., and the joint line in the cylinder axis direction is welded, or a steel sheet with a certain width And a spiral tube which spirally winds the above-mentioned band and fits and locks the overlapping end faces. A desired pipe line is formed by joining the end faces of the single pipes. In order to join the pipes at the construction site, the simplest and most efficient method is required.

[0004] One of the joining methods of air conditioning duct pipes conventionally generally used for plumbing is to increase the diameter of one end of the air conditioning duct pipe to form a receiving port, and insert another air conditioning duct into the receiving port. A receptacle / insertion type in which an end of a duct pipe is inserted and inserted into an opening is widely used. However, it is not sufficient to join single pipes as ducts for air conditioning.For example, if the joints are shaken or rocked due to an earthquake or typhoon, they will not come off and separate, In addition, it is necessary to prevent the cool air and the hot air from leaking in the middle of the pipe line to lower the thermal efficiency. That is, a locking structure for preventing detachment of single tubes and a sealing structure for preventing leakage are essential requirements when piping in a building.

FIGS. 6 (A) and 6 (B) are longitudinal sectional front views showing two examples of the prior art based on the above-mentioned inlet / outlet method among the air-conditioning duct joints. In order to lock both pipes, in FIG. (A), screws 101 are driven and fixed at a plurality of positions where the circumferential direction of the joint portion is substantially equally divided, and butyl rubber tape 102 or the like is applied from the insertion end to the outer periphery of the pipe. The aluminum tape 103 is wound on the entire surface from the outer peripheral surface to the upper surface of the screw so as to seal the air flow in the pipe from the joint part. Also, in FIG. (B), an adhesive (caulking agent) 104 is interposed between the inner surface of the receptacle and the outer surface of the insertion hole in place of the screw, and is adhered and fixed. This is a method of sealing with duct tape.

On the other hand, FIG. 6 (C) shows a conventional pipe joining technique called a plug-in joint method which is frequently used for a spiral pipe joint or the like, instead of a receiving / inserting method. Each of them is a straight pipe, and is a joint system in which a plug-in joint 105 that is interposed in common across the end faces of both pipes is applied. In this method, it is not necessary to form a receiving port by expanding the diameter of one pipe end. If pipes are inserted from both sides of the joint, the annular ridge 106 at the center of the insertion joint serves as a stopper, and the relative position between the two pipes is reduced. There is an advantage that the positional relationship is specified. However, there is no particular advantage in connection between pipes and there is no particular advantage. As in the case of the inlet / outlet method shown in FIGS. Adhesive 10
In this method, the screw 101 is penetrated and locked, and a duct tape such as an aluminum tape is wound around the outer peripheral surface of the pipe to seal the pipe.

The engagement system shown in FIG. 6 (D) is of a type called a loose flange type, in which an air-conditioning duct pipe is bent at both ends and bent at its ends 107 and joined with a packing 108 therebetween. Loose flanges 109 are attached to both sides along the refraction surface, and both loose flanges are
This is a configuration in which the two pipes are joined by fastening with 10.

[0008]

In the prior art, the piping work for the air conditioning duct is divided by the framework of the floor surface and the ceiling after the floor surface of the building is formed and before the ceiling surface is attached as described above. In addition, long single pipes are connected in an extremely narrow space to form pipes vertically and horizontally, so the work must be performed at heights with poor scaffolding, and the work must be performed in an extremely unstable posture. We face the inherent bad condition of unnatural work to twist and shrink. Use a tool such as a drill or screwdriver to fix the air conditioning duct pipes in a narrow and unstable place with fine screws, or apply an adhesive between both pipes and insert them. Needless to say, the operation of winding the tape is extremely complicated and inefficient. In addition, since it is a manual operation by a worker in the field, it is inevitable that a difference in individual skills directly affects the workmanship of the construction, and the superiority of the plumbing work is directly related to the superiority of the air conditioning function thereafter.

Structurally speaking, FIGS. 6A and 6B show:
Regardless of the receptacle / insertion type or the plug-in type shown in Fig. (C), the fixing of the air-conditioning duct pipes depends only on the locking of the screws and the action of the adhesive. In particular, high-rise buildings must be able to withstand significant swings on the upper floors, even in normal high winds, and rarely must be able to withstand large swings due to typhoons and gusts. In addition, there is no doubt that there is a possibility of being hit by the earthquake and strong pitching and rolling shaking, and the screw fixed during a long use period fluctuates and the air flow in the pipe starts leaking from the screw hole, The intermediate adhesive deteriorates during long use, and its adhesive strength is deteriorated.In addition, it is shaken and cracks are generated.The fixing function is reduced, and the air-conditioning function is reduced due to leakage or detachment from the air-conditioning duct joint. It can be a cause for loss. In this respect, in the prior art shown in FIG. 6D, the fear of leakage or the like is eliminated because the packing is sandwiched in the middle, but a large number (for example, eight) of bolts and nuts are equally distributed around the circumference. 110
The work of uniformly tightening at any position on the circumference is more complicated than other conventional techniques, requires skilled skills, and there is a great doubt about workability.

[0010] In order to solve the above-mentioned problems, the present invention relates to the piping work of an air conditioning duct, regardless of the level of work experience, and without the use of tools. The end joints can be connected with one touch, and the air-conditioning function after piping, that is, the provision of a duct joint for air-conditioning that long guarantees a highly reliable function of preventing separation and preventing leakage of airflow in the pipe is provided. Aim.

[0011]

Of steel empty <br/> tuning duct joint according to the problem-solving means for the present invention, to form a receptacle and expanded one end of the air conditioning duct pipes, other air-conditioning duct pipe For the type of air-conditioning duct joint in which the insertion hole is inserted into the reception hole and locked, the reception hole 1 in which a plurality of circular engagement holes 11 are formed at positions where the circumference near the end face 12 is equally divided. A concave groove 21 having a substantially semicircular cross section at a position coinciding with the engaging hole 11 when the elastic ring 3 is inserted to a predetermined position in the receptacle, and the elastic ring 3 is fitted further to the insertion port tip side than the concave groove 21. When the insertion opening 2 is inserted into the receiving port 1 with the insertion port 2 inserted to a predetermined position of the receiving port 1, the insertion groove 2 penetrates the engaging hole 11 and the concave groove 21. engaging hole to be fitted position to 11 the same number of half-spherical shape
It comprises a bulging projection 41 flexibly curved between the slidable
It is characterized in that it comprises a split annular fixed band 4 in which a latch 44 is engaged and detachably straddled at both ends which are engaged and notched.

In this configuration, the elastic ring 3 is fitted into the concave groove 22 on the distal end side of the insertion opening 2 and inserted into the receiving opening 1 so that the center line of the engaging hole 11 of the receiving opening and the concave portion of the insertion opening are formed. Insert until the center position of the groove 21 matches. By fitting the engaging hole 11 and the concave groove 21 evenly distributed on the circumference, the positional relationship in the tube axis direction between the two is determined, so that the catch is latched on the outer peripheral surface connecting the engaging hole 11 of the receiving port. When the lock 44 is unlocked, the fixing band 4 is fitted, and the plurality of bulging projections 41 are fitted into the concave grooves 21 through the engagement holes, and then locked. The inner ends of the fixed band are crimped onto the outer periphery of the receiving port over the entire circumference, and the receiving ends and the receiving ends of both duct pipes are bulged. The two air conditioning duct pipes are fixed at a fixed position through the engagement of the mating hole and the insertion groove, and are connected with one touch. That is, no matter how narrow the piping site is, there is no need to use any tool or jig, and anyone can solve the above-mentioned problem by completing the pipe connection instantaneously.

[0013] Further, a plug-in joint is interposed across both end faces of the air-conditioning duct pipe having a basic configuration of two steel plates , and an annular ridge protruding from the center of the plug-in joint is used to connect the two pipes. In the type of the bayonet joint type in which the relative position is specified, the air-conditioning duct pipe 10 in which a plurality of circular engaging holes 11 are drilled at positions where the circumference near the end face 12 is equally divided, and the air-conditioning duct pipe 10 An annular ridge 53 that is fitted and abutted from both sides,
The air-conditioning duct tube 10 includes insertion portions 54 on both sides of the annular ridge 53 that is fitted inside the air-conditioning duct tube 10. The air-conditioning duct tubes are fitted into the insertion portions 54 until they come into contact with the annular ridge 53, respectively. The groove 51 having a substantially semicircular cross-section at a position coinciding with the engagement hole 11 and a groove 52 for fitting the elastic ring 3 at the distal end of the insertion portion further from the groove 51. Insert the joint 5 and the air conditioning duct pipe into the joint 5
When fitted outside from each air conditioning duct tube 10 in a state of being inserted from both sides of the
1 and a position where it can be fitted into the concave groove 51 of the insertion portion 54
To comprise engagement holes 11 and the bulging protrusions 41 of the same number of half-spherical shape
A slidable curved surface flexibly engages with each other, and a split annular fixed band 4 in which a latch 44 is detachably provided at both ends of the cutout. There is no difference in the operation of this configuration from the type of the above-mentioned receptacle / insertion, and the straight pipe ends of both air conditioning duct pipes substantially follow the receptacle configuration of the previous configuration, and are inserted. It can be seen that the insertion portions on both sides of the joint symmetrically apply the insertion shape of the above configuration.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially sectional front view showing an embodiment of a receptacle / insertion type of the present invention, and FIG.
FIG. 3 is a front view (A) and a side view (B) of a fixing band applied to the same form. In FIG. 1 and FIG. 2, the receiving port 1 is a duct pipe 10 for air conditioning.
The engagement hole 11 is formed at a short distance from the end face 12. In the case of this figure, the engaging holes 11 are provided at the positions where the circumference is divided into four equal parts, and have the same hole diameter. Molded.

The elastic ring 3 is externally fitted in the concave groove in the insertion opening 2, and the deep groove 22 A and the shallow groove 2
2B is formed in two steps, and the flat ring 33 of the elastic ring 3 having an F-shaped cross section is fitted into the deep groove 22A, which can lead to particularly good results. However, there are many practical products such as U-shape, H-shape, L-shape, and O-shape for the cross section of the elastic ring, and it is desirable to appropriately select the cross-section because of their features and price differences. In the example of this figure, two long legs 31 in which the elastic ring 3 protrudes from the flat ring 33 to the outer peripheral side,
The short leg 32 forms an F-shaped cross section, and this specially shaped elastic ring is disclosed in Japanese Utility Model Publication No. 2-4309 (utility model registration No. 1,831,55) which has already been developed and published by the applicant himself.
Although it is a known technique according to No. 1), in order to surely solve the above-mentioned problem of the conventional technique, an extremely effective sealing action has been demonstrated. It is larger than the inner diameter of the engaging hole on the outer peripheral surface of the insertion port 2 and on the circumference that coincides with the circumference connecting the centers of the engaging holes 11 drilled at a constant pitch in the circumferential direction of the receptacle. The center line of the concave groove 21 having a semicircular cross section having an inner diameter is set.

FIG. 1 shows an overall state in which a receiving port and an insertion port are joined, and FIG. 2 is an enlarged view of a main part of the joint shown by a circular dashed line in FIG. When the flat ring 33 of the elastic ring 3 having an F-shaped cross section is fitted into the deep groove 22A of the insertion opening 2 and inserted into the enlarged receiving port 1, the elastic ring 3 is pushed down by the inner surface of the receiving port.
The long leg 31 falls down into the shallow groove 22B, the short leg 32 is folded and fitted on the flat ring 33 in the deep groove 22A, and the space between the inner surface of the receptacle and the outer surface (groove surface) of the insertion opening is elastically deformed. It is placed in a completely sealed state by an elastic ring. The insertion port 2 which has entered in the axial direction until the engagement hole 11 near the front end of the receptacle 1 and the inner concave groove 21 coincide with each other, stops the insertion after confirming this moving state from outside through the engagement hole, At that position, the fixing band 4 is mounted on the outer peripheral surface of the receptacle.

FIG. 3 shows an embodiment of the fixing band 4, in which a stainless steel band is formed by a split annular body having substantially the same diameter as the outer diameter of the receiving port, and has the same pitch as that of the locking hole 11. The same number of bulging protrusions 41 protruding toward the tube axis side to positions evenly distributed on the circumference with a cut-out cross section in which end portions 42 and 43 facing each other at a distance form a cutout portion 40. Become. End 42,
A latch 44 is provided that straddles or locks both ends of the ring 43, and is unlocked before installation to fit the main body of the ring around the outer periphery of the socket, and to engage with the engaging hole 11 of the socket. Part 41
Is fitted into the groove 21 of the insertion hole that passes through the engagement hole and overlaps the lower surface of the receptacle, locks the latch, and is fixed immovably at this position. The latch is commonly called a “snap lock”, and as shown in FIG. 3, a locking piece 44A bent into a V-shaped cross section at one end 42 of the notch 40, and is rotatably restrained at the other end 43. Although a simple structure combining the engaged latch 44B and the engaging / disengaging member 44C for opening or fixing the latch 44B has been exemplified, other known models can be used as long as the same function is achieved.

FIG. 4 is a front view of a partial cross section showing an embodiment of a plug-in joint system instead of the above-mentioned socket / insertion system, and FIG. 5 is a sectional view taken along the line AA of FIG. . The basic configuration itself is completely the same as the previous embodiment, and the end surfaces 12 of the two air conditioning duct pipes 10 strike the annular ridge 53 at the center of the insertion joint 5 to determine the joint position, and the insertion joint 5 A concave groove 51 and a concave groove 52 having the same configuration as that of the insertion port 2 in the above-described configuration are provided circumferentially symmetrically to the annular ridge 53, and most preferably a deep groove 52 that is continuous from the end face 31 via a step.
A and a shallow groove 52B are formed, and it is highly preferable that the elastic ring 3 having the F-shaped cross section is fitted into the deep groove on both sides as in the previous embodiment.

On the other hand, an engagement hole 11 having the same configuration as the receiving port 1 of the above-described form is formed in the outer peripheral surface of the air conditioning duct tube 10 slightly inward from the end surface 12 by a predetermined distance. The bulge 41 of the fixing band 4 penetrates the hole and fits into the concave groove 51 of the plug-in joint 5, so that the air-conditioning duct pipe 10 is securely fixed to both sides of the plug-in joint 5.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the concrete dimensions of the inlet / outlet type will be described in more detail by way of example. The production of an air-conditioning duct tube is performed using a stainless steel plate having a thickness of 0.5 to 2.0 mm.
Appropriately selected according to the application, etc., plastically deformed into a circular cross section by roll processing, welding between joints facing in the axial direction,
For example, it was formed into a cylindrical body having a nominal diameter of 150 mm. In the case of an air-conditioning duct tube having a nominal diameter of 150 mm, the receiving port is formed by expanding the diameter by about 3 mm over about 80 mm from one pipe end face. A 13 mm-diameter engaging hole is passed through each of four equally-spaced portions of the circumference 15 mm inward from the end face of the socket.

In order to fit an elastic ring having a substantially F-shaped cross section near the end of the pipe, the insertion hole has a depth of 3.5 mm and a depth of 2 mm.
A shallow groove of mm is formed by roll processing, and an elastic ring is fitted into the deep groove. Approximately 63m from the pipe end beyond the shallow groove
The circumference at the position where m is entered is divided into four equal parts, and the concave grooves each having a substantially semicircular cross section and a depth of about 6 mm are formed by diameter reduction processing.

The fixed band has a thickness of 0.5 mm and a width of 30 mm
And is manufactured to have the same radius of curvature as the outer radius of the socket. A hemispherical protruding convex portion having a diameter of 12 mm is provided at each position obtained by equally dividing the circumference on the center line in the width direction into four parts toward the tube axis side. A notch is formed by cutting off one portion at an intermediate position between the bulging protrusion and the bulging protrusion, the notch distance between both opposing ends is about 20 mm, and the latch is straddled at both ends. I do.

[0023]

As described above, according to the present invention, the joining of an air-conditioning duct pipe to be constructed in an unnatural posture in a narrow place at a high altitude is completed in one instant without using any tool. The modifications have been made so that the cumbersome and inefficient drawbacks of the prior art are fundamentally eliminated, which has the great effect of eliminating bottlenecks in the construction work schedule and increasing overall productivity. In addition to improving workplace safety and eradicating occupational accidents, the reliability of construction work due to work mistakes and individual differences can always be significantly higher than conventional levels, so both labor and management can enjoy it. The effects are immeasurable.

Considering the product itself obtained as a result of the implementation, the locking between the receptacle and the insertion port or between the straight pipe and the plug-in joint is not a fixed one such as a screw, an adhesive, or a bolt and a nut. Because it is restrained by the pressing of the spherical surfaces slidably in contact with each other, it is flexible even in the event of rocking, shaking, etc., so it absorbs stress and breaks off or peels off easily. Not even. Also, section F
Since the inside and outside of the pipe are sealed by the ring-shaped elastic ring, the air-conditioning duct is reliably sealed and the leakage is completely prevented. At the stage of shipment from the factory to the construction site, if an elastic ring is fitted to the insertion port, at a narrow construction site, simply insert the insertion port into the receptacle and fix it with a fixed band, or connect both straight pipes. The splicing is completed instantaneously with literal one-touch operation simply by inserting it on both sides of the bayonet joint and fixing each with a fixing band, so that an undesired high workability can be obtained any more.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a front view (A) and a side view (B) of a fixing band.

FIG. 4 is a partially sectional front view showing another embodiment of the present invention.

FIG. 5 is a sectional view taken along the line AA of FIG. 4;

6 (A) to 6 (D) show four types of prior art longitudinal sectional front views. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving port 2 Insertion opening 3 Elastic ring 4 Fixing band 5 Plug-in joint 10 Air-conditioning duct pipe 11 Engagement hole 12 End face 21 Concave groove 22 Concave groove 23 Tip 31 Long leg 32 Short leg 33 Flat ring 40 Notch 41 Swelling Convex part 42 End part 43 End part 44 Latch 51 Lock groove 52 Concave groove 53 Ring ridge 54 Insertion part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 53-78619 (JP, U) Japanese Utility Model Showa 61-11080 (JP, U) Japanese Utility Model Showa 54-124215 (JP, U) Japanese Utility Model Showa 57- 157711 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 21/06

Claims (2)

(57) [Claims] 1. An air-conditioning duct joint in which one end of an air-conditioning duct pipe made of a steel plate is enlarged in diameter to form a receiving port, and an insertion port of another air-conditioning duct pipe is inserted into the receiving port and locked. A receiving hole 1 having a plurality of circular engaging holes 11 perforated at a position where the circumference near the end face 12 is equally divided, and a position coinciding with the engaging hole 11 when inserted to a predetermined position in the receiving hole. Cross section almost
A slot 2 having a semicircular groove 21 and a groove 22 for fitting the elastic ring 3 on the front end side of the slot further than the groove 21.
When the insertion port 2 is inserted into the receptacle 1 with the insertion port 2 inserted to a predetermined position of the receptacle 1, the engagement hole 11 is positioned at a position where it can penetrate through the engagement hole 11 and fit into the concave groove 21. With the same number of hemispherical bulging projections 41 and slidably curved surfaces flexibly engaged with each other ,
An air-conditioning duct joint comprising a split annular fixed band 4 in which latches 44 are detachably provided on both ends of the cutout. Wherein the bayonet joint interposed straddling the end surface of both of the two sheet steel of the air-conditioning duct tube, relative position of the two pipe by an annular ridge projecting from the center of the difference included joint In the air-conditioning duct joint of the insertion type, the end face 12
An air conditioning duct pipe 10 having a plurality of circular engagement holes 11 perforated at positions obtained by equally dividing a nearby circumference; an annular ridge 53 into which the air conditioning duct pipe 10 is fitted and abutted from both sides; It is composed of insertion portions 54 on both sides sandwiching the annular ridge 53 that is fitted in the duct pipe, and the air conditioning duct pipe is inserted into the insertion portion 54 until it comes into contact with the annular ridge 53. A cross section substantially at a position corresponding to the engagement hole
The insertion joint 5 having a semicircular concave groove 51, a concave groove 52 for fitting the elastic ring 3 on the distal end side of the insertion portion further from the concave groove 51, and the air conditioning duct pipe 10 are connected to both sides of the insertion joint 5. When each is fitted to the air-conditioning duct pipe 10 in a state where it is fitted from above and abuts on the annular ridge 53, it is engaged with a position where it can be fitted into the groove 51 of the insertion portion 54 through the engaging hole 11. Goana 11 as many slidable comprises a semi-spherical bulge protuberances 41
Air-conditioning duct joint, which comprises a split annular fixed band 4 in which flexible curved surfaces are flexibly engaged with each other, and latches 44 are detachably provided on both ends of the cutout. .