JP7189858B2 - Elbow for air conditioning piping - Google Patents

Description

The present invention relates to elbows for air conditioning piping in buildings.

Generally, in large or medium-sized buildings such as shopping centers, high-rise housing complexes, hotels, and hospitals, air ducts are installed between the slabs and ceiling panels for internal cooling, heating, ventilation, and other air conditioning. The air in the room is discharged through the duct and sent to the air conditioning unit, while the conditioned air is supplied into the room through the same duct.

A so-called press elbow is inserted and installed at the bent portion of the air duct. This elbow for air-conditioning piping was made by blanking a galvanized steel plate into an elbow shape with a constant bending angle, drawing it into a semi-circular cross section, and crimping a pair of opposing internal corners and external corners to integrate them. which is disclosed, for example, in Patent Document 1.

18 and 19 schematically show an elbow with a bending angle of 90 degrees and an elbow with a bending angle of 45 degrees in the conventional elbow for air conditioning piping. Equipped with a bent main body pipe portion (1) forming concentric parallel arc surfaces, and a straight pipe connection portion (2) projecting from both ends thereof by a certain length, and an air duct ( A spiral duct) (not shown) is inserted and fixed.

JP-A-7-280331

However, as can be seen from Table 4 below, which shows the dimensions of the elbow for air-conditioning piping, regardless of whether the product has a bending angle of 90 degrees or a bending angle of 45 degrees, the bending radius of the bent body pipe portion (1) is large. Since the (curvature radius) (r) is set to the same large value as the outer diameter (nominal diameter), plastic deformation and caulking can be easily performed on the internal corner side, resulting in stable quality products (press elbows). Although there are advantages to be obtained, there are still the following problems to be improved.

即ち、図１８、１９に基づいて言えば、今エルボの長さ（ｘ）と高さ（ｙ）が一定であると仮定した場合、その屈曲本体管部（１）の曲げアール（曲率半径）（ｒ）が大きい分だけ、両端に残存する直管接続部（２）の張り出し長さ（ｓ）が短くなる関係上、その直管接続部（２）へエヤーダクト（スパイラルダクト）を充分奥深く安定裡に差し込むことができず、その差し込み代の不足により、気密効果や耐久強度などの低下を招く結果となる。

That is, based on FIGS. 18 and 19, assuming that the length (x) and height (y) of the elbow are constant, the bending radius (curvature radius) of the bent main tube portion (1) is As (r) increases, the overhang length (s) of the straight pipe connection portions (2) remaining at both ends is shortened, so the air duct (spiral duct) is sufficiently deep and stable to the straight pipe connection portions (2). It cannot be inserted into the inside, and the lack of insertion allowance results in a decrease in the airtightness effect and durability strength.

Conversely, assuming that the extension length (s) of each of the straight pipe connection portions (2) is constant, the bending radius (curvature radius) (r) of the bent main pipe portion (1) is also large. Since the length (x) and height (y) of the elbow are too large, it becomes impossible to sharply bend the bent portion of the air duct in a small and compact manner.

In this respect, not only the above-mentioned air duct piping but also electrical wiring and sprinkler piping are installed in the ceiling space of the building, so a large space cannot be used only for the air conditioning piping. In particular, exhaust ducts that are plumbed around water such as kitchens, bathrooms, toilets, washrooms, etc., are designed to be preferentially straight, and air conditioning ducts should be avoided. Due to the restrictions that must be performed, the elbow itself is also required to bend sharply.

Furthermore, conventional elbows for air conditioning have not only the problem of using pipes, but also the problem of being extremely bulky and heavy in transportation and storage, which unnecessarily costs a lot of money.

An object of the present invention is to solve such a problem. In an elbow for air conditioning piping, in which the internal corners are crimped and integrated ,

A numerical value obtained by setting the radius of curvature of the inside corner side to 10 mm to 40 mm, and adding the radius of curvature of the inside corner side to the outer diameter of 100 mm or 150 mm for the radius of curvature of the outside corner side. is set to concentric circles .

In claim 2, an elbow for air-conditioning piping, which has an elbow shape bent at 45 degrees in a side view, and in which a pair of facing external corners and internal corners forming a semicircular cross section are crimped and integrated ,

The curvature radius on the inside corner side is set to 40 mm or less, and the curvature radius on the outside corner side is the numerical value obtained by adding the set curvature radius dimension on the inside corner side to the outer diameter dimension of 100 mm or 150 mm. It is characterized by being set to concentric circles .

Further, in claim 3, at the boundary position between both ends of the curved body pipe portion having the set value of the curvature radius described in claim 1 or 2 and the straight pipe connection portion continuously and integrally projecting from both ends, Steps or ribs that make the curved main pipe section protrude higher than the straight pipe connection part are placed on the left and right sides of the inside corner by 30 degrees each, except for an angle range of 60 degrees in total. It is characterized in that it is applied to the remaining area of the circumferential surface .

Furthermore, in claim 4, the circumferential surface of the straight pipe connection portion is formed as a tapered conical surface or a straight surface having a step in the middle of the overhang length,

A plurality of dowels that serve as stoppers for inserting air conditioning ducts from the circumferential surface of the straight pipe connection are arranged parallel to the step or rib at the boundary position between the straight pipe connection and the bent main body pipe while maintaining a constant interval. It is characterized by being raised in a scattered distribution state.

According to the above configurations of claims 1 and 2, regardless of whether the bending angle is an elbow of 90 degrees or an elbow of 45 degrees, the problem of the conventional product described at the beginning can be completely improved. be.

In other words, in the configuration of claim 1, the radius of curvature (bending radius) of the internal corner side of the elbow for air conditioning piping having a bending angle of 90 degrees is set small within a numerical range of 10 mm to 40 mm. It is small and compact with a short length and a low height, and can be bent sharply on the piping of air-conditioning ducts. It can be prevented.

Further, according to the configuration of claim 2, the radius of curvature (bending radius) of the internal corner side of the elbow for air conditioning piping having a bending angle of 45 degrees is set to a small numerical value of 40 mm or less. After all, it is small and compact, and various effects similar to those of claim 1 can be obtained.

In both claims 1 and 2, if the structure of claim 3 is adopted, no steps or ribs are protruded on the inner corner side of the elbow for air conditioning piping. Even if the radius of curvature (bending radius) of the side is set small, there is an effect that drawing and crimping of the elbow can be easily performed, which is useful in mass production.

Furthermore, if the configuration of claim 4 is adopted, even if the radius of curvature (bending radius) of the internal corner side of the elbow for air conditioning piping is set small, the air conditioning duct that is inserted and fitted into both of the straight pipe connection portions can be used. It is possible to reliably prevent overlapping and interference of the sealing tapes wound around the connection point (joint) between the air conditioning duct and the bent main body tube portion from above due to the ends being too close to each other. effective.

FIG. 4 is a perspective view showing a 90-degree bend angle elbow according to an embodiment of the present invention; 2 is a side view of FIG. 1; FIG. 3 is a bottom view of FIG. 2; FIG. 3 is an enlarged cross-sectional view taken along line 4-4 of FIG. 2; FIG. 3 is an enlarged cross-sectional view taken along line 5-5 of FIG. 2; FIG. 3 is an enlarged cross-sectional view taken along line 6-6 of FIG. 2; FIG. FIG. 4 is a perspective view showing an elbow with a bending angle of 45 degrees according to an embodiment of the present invention; FIG. 8 is a side view of FIG. 7; FIG. 9 is a bottom view of FIG. 8; 3 is a side view corresponding to FIG. 2 showing another embodiment of the present invention; FIG. 11 is an enlarged cross-sectional view taken along line 11-11 of FIG. 10; FIG. FIG. 4 is a half cutaway cross-sectional view showing a tapered conical straight pipe connection in an elbow. FIG. 14 is a half-cut cross-sectional view corresponding to FIG. 13 showing a straight-shaped straight-pipe connecting portion with a level difference in the elbow. FIG. 3 is a side view corresponding to FIG. 2 for showing preferred numerical values; FIG. 9 is a side view corresponding to FIG. 8 for showing preferred numerical values; FIG. 3 is a schematic side view corresponding to FIG. 2 showing a comparison with a conventional product; FIG. 9 is a schematic side view corresponding to FIG. 8 showing a comparison with a conventional product; FIG. 3 is a schematic side view showing a conventional elbow with a bending angle of 90 degrees; FIG. 3 is a schematic side view showing a conventional elbow with a bending angle of 45 degrees;

1 to 6 show an elbow (A) for air conditioning piping with a bending angle (θ) of 90 degrees, which has a constant outer diameter. Equipped with a bent main body pipe part (11) of (D) and a pair of straight pipe connection parts (12) projecting continuously and integrally from both ends thereof by a certain length (S), both of the inner corner and the outer corner being crimped It is attached and integrated. (13) and (14) indicate the band-shaped caulking line with a constant width (for example, 3.1 mm) (W).

Moreover, the radius of curvature (bending radius) (R1) of the elbow (A) on the side of the internal corner is set to a numerical range of 10 mm to 40 mm, preferably 25.0 mm to 25.5 mm. A concentric circle with a numerical value obtained by adding the outer diameter (D) of the bent main body tube portion (11) to the set value becomes the radius of curvature (bending radius) (R2) on the outward corner side, and the outer diameter (D ) (the radius of the curved main tube portion) is added to form the radius of curvature (bending radius) (R) on the longitudinal center line (cylinder core line).

In this case, if the radius of curvature (R1) of the inside corner is less than 10 mm, the inside corner of the elbow (A) cannot be drawn smoothly and reliably from a galvanized steel blank. 10 mm is the so-called limit value for drawing forming. Conversely, if the length is greater than 40 mm, even if the blank can be draw-formed without any trouble, the overall length of the elbow (A) will be lengthened. This is not desirable because it increases the cost of transportation and storage.

7 to 9 show an elbow (B) for air conditioning piping with a bending angle (θ) of 45 degrees, which also has a bent main body pipe portion (11) with a constant outer diameter (D) and a constant Equipped with a pair of straight pipe connections (12) that extend continuously and integrally by a length (S), and whose inner and outer corners also have a constant width (e.g., 3.1 mm) (W) strip line (13) ( 14) are integrated by caulking.

The radius of curvature (bending radius) (R1) on the internal corner side of the elbow (B) is set to a value of 40 mm or less, preferably 10.0 mm to 10.5 mm. ) is the curvature radius (bend radius) (R2) of the outside corner side, and half (radius) of the outer diameter (D) is added. The concentric circles of the numerical values thus obtained are the radius of curvature (bending radius) (R) on the longitudinal center line (cylinder core line) of the elbow (B).

In this case, for the elbow (B) with a bending angle (θ) of 45 degrees, even if the radius of curvature (bending radius) (R1) on the inside corner side is zero, the steel plate blank can be draw-formed without any trouble. Therefore, it is sufficient to set the upper limit value to 40 mm. The reason for limiting the length to 40 mm is the same as the elbow (A) having a bending angle of 90 degrees.

The boundary between the bent main pipe portion (11) and both straight pipe joints (12) at both the elbow (A) with the bending angle (θ) of 90 degrees and the elbow (B) with a bending angle of 45 degrees At the position there is a step or rib (15) which causes the circumference of the bent body tube (11) to be raised higher than the circumference of its straight pipe connection (12). 9, 30 degrees are given to the left and right sides of the internal corner, excluding an angular range (γ) of 60 degrees in total.

That is, of the circumferential surface (360 degrees), the step (rib) (15) is in the angle range (γ) of 30 degrees to the left and right sides centering on the crimp line (13) at the inside corner for a total of 60 degrees. However, after the angle range (γ) is exceeded, the step (rib) (15) begins to rise gradually, and from the point where it progresses to the left and right sides by 30 degrees toward the outside corner, the remaining circumferential surface In the area of , a step (rib) (15) with a constant raised height (for example, 1 mm) is provided, and since there is no step (rib) (15) on the inside corner side, the inside corner Even if the radius of curvature (bending radius) (R1) of the side is set small, drawing can be easily performed.

Air ducts (16) for air-conditioning pipes, which are inserted from their ends into both straight pipe joints (12) of the elbows (A) and (B), are inserted into the boundary step (16) with the bent body pipe portion (11). However, if the step (rib) (15) receives it, the smaller the radius of curvature (bending radius) (R1) of the above-mentioned internal corner side, the more straight pipe connection therebetween. Since the tips of the air ducts (16) inserted and fitted into the portion (12) are close to each other, the connection point (joint) between the two air ducts (16) and the bent main body pipe portion (11) is covered from above. Belt-shaped seal tapes (not shown) wound around the piping overlap and interfere with each other, making it difficult to perform the winding work at the piping site and causing a decrease in the airtight effect.

In order to prevent such a situation, regardless of whether the elbow (A) has the above bending angle (θ) of 90 degrees or the elbow (B) of 45 degrees, the circumference From the surface, a plurality of (four each in the figure) dowels (17) serving as insertion stoppers for the air duct (16) are located at the boundary with the bent main body tube (11) as shown in FIGS. It is raised in a scattered distribution state in parallel arrangement with a certain step or rib (15) and a constant distance (eg 7.5 mm) (d). The raised height of the dowel (17) is, for example, 1.0 mm to 1.5 mm. Even the step (rib) (15) that does not receive the air duct (16) functions as a reinforcing bead for the elbow itself.

Although not shown, the ends of the air ducts (16) respectively received by the dowels (17) of the straight pipe joints (12) are covered with a seal tape (not shown) wound from above and fixed in an airtight state. maintain.

Furthermore, the head of the screw or rivet (not shown) for fixing the air duct (16) to the straight pipe connection (12) is screwed or driven in at the construction site. is also covered with the sealing tape from above in an airtight state.

Moreover, in this case, the circumferential surface of both straight pipe connecting portions (12) is a tapered conical surface (see FIG. 12) that gradually becomes thicker as it goes from the narrow tip side to the protruding root side of the dowel (17). By this, the air duct (16) inserted until it is received by the dowel (17) and the straight pipe connection part (12) become eccentric and thickened. There are no large gaps at the base, and it is possible to maintain an airtight state that is naturally centered correctly. The inclination (gradient) angle of the tapered conical surface is, for example, 0.57 degrees.

However, if it is possible to maintain airtightness in the concentric state, instead of forming the circumferential surface of both straight pipe joints (12) as a tapered conical surface extending over the entire overhang length (S), as shown in FIG. As shown in the corresponding modified embodiment of FIG. 13, the boundary step (rib) ( 15) may be formed as a straight surface with a step (18) having a step (18) that is about 1 mm lower on the tip side than the circumferential surface on the root side that is about 1 mm lower than 15).

The elbows (A) and (B) for air conditioning piping are made of galvanized steel sheet (JIS G 3303) or hot-dip galvanized steel sheet (JIS G 3302) with a constant thickness (T) as a blank, with a bending angle (θ) of 90 degrees. It can be manufactured by punching into an elbow shape or a 45° elbow shape, drawing into a semicircular cross section, and then crimping and integrating a pair of opposing internal corners and external corners.

Preferred numerical values for mass production are as illustrated in FIGS. 14 and 15 and Table 1 below.

As suggested by the numerical values in Table 1 above, in the elbow (A) with a bending angle (θ) of 90 degrees and an outer diameter (nominal diameter) (D) of 100 mm, the curvature on the longitudinal center line (cylinder core line) The radius (bending radius) (R) is set to 75 mm, the curvature radius (bending radius) (R1) on the inside corner side is set to 25.0 mm to 25.5 mm, the bending angle (θ) is also 90 degrees, and the outer diameter ( For an elbow (A) with a nominal diameter (D) of 150 mm, the curvature radius (bending radius) (R) on the longitudinal center line (cylinder core line) is 100 mm, and the curvature radius (bending radius) (R1) on the inside corner side. is also set to 25.0 mm to 25.5 mm, the length of the elbow (A) (X ) and height (Y) are significantly shorter (lower) than the length (x) and height (y) of the conventional elbow shown in FIG. , it has the effect of obtaining a short and sharply bent piping state.

18 and 19 and Table 4 show the weight of the elbow (A), as is clear from the comparison between Table 2 below showing the products of the present invention and Table 3 below showing the conventional products. In addition to being able to reduce the weight by about 20% to 30% of that of the conventional elbow, the internal volume of the bent main body pipe portion (11) in the elbow (A) can also be significantly reduced compared to that of the conventional elbow.

As a result, handling work in the narrow space above the ceiling of the building can be carried out with ease, helping to reduce transportation costs, etc., as well as the advantage of being able to reduce the movement time of the fluid in the air conditioning pipes and the operating time of the pump. There is

On the other hand, for an elbow (B) with a bending angle (θ) of 45 degrees and an outer diameter (nominal diameter) (D) of 100 mm, the curvature radius (bending radius) (R) on the longitudinal center line (cylinder core line) is 60 mm. , The radius of curvature (bending radius) (R1) on the inside corner side is set to 10.0 to 10.5 mm, the bending angle (θ) is also 45 degrees, and the outer diameter (nominal diameter) (D) is 150 mm. In (B), the curvature radius (bending radius) (R) on the longitudinal center line (cylinder core line) is 85 mm, and the curvature radius (bending radius) (R1) on the inside corner side is also 10.0 mm to 10.5 mm. 17, the length (X) and height (Y) of the elbow (B) can be changed by setting The length (x) and height (y) of the conventional elbow shown in Fig. 19 are significantly shorter (lower) and can be made smaller and more compact. is obtained.

Furthermore, as is clear from the comparison of Tables 2 and 3 above, the weight of the elbow (B) is reduced by about 20% to 30% from that of the conventional elbow shown in FIGS. At the same time, the internal volume of the bent main body pipe portion (11) in the elbow (B) can be greatly reduced compared to that of the conventional elbow. ), the same effect as above can be obtained.

(1) (11) Bent main body pipe portion (2) (12) Straight pipe connection portion (13) Internal corner crimping line (14) External corner crimping line (15) ) Boundary step or rib (16) Air conditioning duct (17) Dowel (18) Step (A) 90 degree elbow (B) ・・・・・・45 degree elbow (d) ・・・Constant interval (D) ・・・Outer diameter (r) (R) ・・・Radius of curvature (bending radius)
(R1)・・・Inner corner radius of curvature (R2)・・・External corner radius of curvature (x)(X)・・・Length (y)(Y)・・・Height (θ ) Bending angle

Claims (4)

1. An elbow for air-conditioning piping, which has an elbow shape bent at 90 degrees when viewed from the side, and in which a pair of facing external corners and internal corners forming a semicircular cross section are crimped and integrated ,
A numerical value obtained by setting the radius of curvature of the inside corner side to 10 mm to 40 mm, and adding the radius of curvature of the inside corner side to the outer diameter of 100 mm or 150 mm for the radius of curvature of the outside corner side. An elbow for air conditioning piping, characterized in that it is set to concentric circles . 1. An elbow for air-conditioning piping, which has an elbow shape bent at 45 degrees when viewed from the side, and in which a pair of facing external corners and internal corners forming a semicircular cross section are crimped and integrated ,
The curvature radius on the inside corner side is set to 40 mm or less, and the curvature radius on the outside corner side is the numerical value obtained by adding the set curvature radius dimension on the inside corner side to the outer diameter dimension of 100 mm or 150 mm. An elbow for air-conditioning piping characterized by being set in concentric circles . At the boundary position between both ends of the curved body tube portion having the set value of the curvature radius described in claim 1 or 2 and the straight pipe connection portion continuously and integrally projecting from both ends, the circle of the straight pipe connection portion A region of the circumferential surface where steps or ribs that make the bending main body tube portion rise higher than the circumferential surface are left except for an angle range of 30 degrees on both left and right sides of the internal corner for a total of 60 degrees. 3. The elbow for air-conditioning piping according to claim 1 or 2, wherein the elbow is attached to the . Forming the circumferential surface of the straight pipe connection part as a tapered conical surface or as a straight surface with a step in the middle of the overhang length,
A plurality of dowels that serve as stoppers for inserting air conditioning ducts from the circumferential surface of the straight pipe connection are arranged parallel to the step or rib at the boundary position between the straight pipe connection and the bent main body pipe while maintaining a constant interval. 4. The elbow for air-conditioning piping according to claim 3, characterized in that it is raised in a scattered distribution state.

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