JP4290262B2 - Mechanical pipe fitting - Google Patents

Description

また、水道用の硬質塩化ビニル管、水道用のポリエチレン管にも同様の引き抜き阻止力が得られた。
【００２２】
【実施例２】
第２の実施例では外側接触面(7)の角度θ₁を１５゜とし、内側接触面(8)の角度θ₂を２５゜〜４０゜として水道用硬質塩化ビニル管、水道用ポリエチレン管をそれぞれ接続し、引張試験機を用いて測定した接続管(6)の引き抜き阻止力の結果を上表の番号１３〜２０に示す。番号１３〜２０の値は従来の管種専用継手の引き抜き阻止力とほぼ同等の値である。
【００２３】
【実施例３】
図４は、図３に示す抜け止め部材(5)及び袋ナット(2)の抜け止め部材(5)と接触する部分近傍の寸法図を示す。図４に示す代表的な寸法は、Ｌ₃＝３.５mm、Ｌ₄＝５.５mm、Ｄ₃＝３８mm、Ｄ₄＝４１.２mm、Ｈ₃＝２mm、Ｈ₄＝２mmである。外側接触面(7)の角度θ₃を３５゜、内側接触面(8)の角度θ₄を５゜として呼び径２５の亜鉛メッキ鋼管、ポリエチレン被覆鋼管をそれぞれ接続し、引張試験機を用いて測定した接続管(6)の引き抜き阻止力（kN）は、亜鉛メッキ鋼管では１７.７、ポリエチレン被覆鋼管では６.３であった。また、比較例として従来の各管種専用の継手による引き抜き阻止力（kN）は、亜鉛メッキ鋼管では１６.８、ポリエチレン被覆鋼管では６.８であった。このように、本発明による第２の実施の形態でも従来の管種専用継手の引き抜き阻止力と同等の特性が得られる。
【００２４】
【実施例４】
図７に示す第５の実施の形態において、抜け止め部材(5)の幅を９mmとし、刃先端の間隔を３mmとする。刃(5a)の先端角度を４５゜、６０゜、９０゜、１００゜、１２０゜として呼び径２０の継手に装着し、呼び径２０の亜鉛メッキ鋼管及びポリエチレン管を接続して引張試験機により管の引き抜き阻止力を測定した。亜鉛メッキ鋼管を接続した場合、刃先端角度が４５°、６０°、９０°、１００°及び１２０°のとき、引き抜き阻止力（kN）は、それぞれ１６.２；１５.９；１６.７；１６.１；及び１６.３であった。ポリエチレン管を接続した場合、刃先端角度が４５°、６０°、９０°、１００°及び１２０°のとき、引き抜き阻止力（kN）は、それぞれ２.４；２.３；２.２；２.２;及び０.８であった。本実施例では抜け止め部材(5)は亜鉛メッキ鋼管に対して殆ど刃(5a)の先端角度に依存せず従来の継手の前記結果と同様の抜け止め阻止力を示した。また、ポリエチレン管に対しても刃先端角度１００゜までは従来の継手による抜け止め阻止力と同様の阻止力を示した。一方、鋼管用の従来の抜け止め部材を用いてポリエチレン管を接続した場合の抜け止め阻止力は０.６kNであった。また、ポリエチレン管用の抜け止め部材(5)を用いて鋼管を接続したときの抜け止め阻止力は１５.９kNであった。適用管種の異なる抜け止め部材(5)を用いた場合、特に鋼管用の抜け止め部材(5)によりポリエチレン管を接続したとき、極端に抜け止め阻止力が低下した。このように本発明では鋼管及びポリエチレン管でも十分な引き抜き阻止力が得られた。
【００２５】
【発明の効果】
前記のように、本発明によるメカニカル式管継手では、異なる管種に対して袋ナット及び抜け止め部材を交換する必要がなく、施工性に優れている。また、異なる管種に対しても十分な引き抜き阻止力を得ることができ、性能に優れた管継手を得ることができる。更に少ない袋ナットの回転数で管径の相違を吸収できるため、袋ナット及び継手本体のねじ部を必要以上に長く形成する必要がなく、抜け止め部材も必要最小限の長さでよいため、管継手全体を小型化しかつ軽量化を図ると共に、取扱い及び施工性を改善することができる。
【図面の簡単な説明】
【図１】 本発明によるメカニカル式管継手の断面図
【図２】 図１に示す抜け止め部材及び袋ナット部の寸法図
【図３】 本発明の第２の実施の形態を示すメカニカル式管継手の断面図
【図４】 図３に示す抜け止め部材及び袋ナット部の寸法図
【図５】 本発明による第３の実施の形態を示す抜け止め部材と袋ナット部の断面図
【図６】 本発明による第４の実施の形態を示す抜け止め部材と袋ナット部の断面図
【図７】 本発明による第５の実施の形態を示す抜け止め部材の断面図
【符号の説明】
(1)・・継手本体、 (2)・・袋ナット、 (3)・・シール部材、 (4)・・ワッシャ、 (5)・・抜け止め部材、[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a pipe joint, in particular, a mechanical pipe joint that can join connecting pipes having different diameters in a single structure.
[0002]
[Prior art]
For example, as shown in Utility Model Registration No. 2500549, a joint body, a seal member disposed between the joint body and the end of the connecting pipe, and a thread formed at the end of the joint body A mechanical pipe joint having a cap nut to be connected and a retaining member that prevents the end of the connecting pipe from coming out by tightening the cap nut with respect to the joint body is known. This type of mechanical pipe joint is superior in workability because the connection pipe can be directly joined by the pipe joint without threading the end of the connection pipe, and the structure has flexibility and stretchability in the joint. Have. For this reason, it is used for pipe connection of fluid supply pipes in various fields including water supply piping such as water supply or hot water supply and air conditioning piping such as cooling water and cold / hot water.
[0003]
For example, steel pipes, vinyl chloride pipes, polyethylene pipes, and the like are used in the water supply piping field, and many of these pipe types have the same nominal diameter but have different pipe outer diameters or tolerances for pipe outer diameters. For example, when comparing the standard outer diameter according to the JIS standard for the nominal diameter 25 of galvanized steel pipes, polyethylene pipes for water supply, and rigid polyvinyl chloride pipes for water supply, the tolerance of the pipe outer diameter is 34 ± 0.5 mm. The smallest outer diameter tube is a 32 ± 0.2 mm vinyl chloride tube. In this case, the outer diameter difference between the maximum diameter and the minimum diameter is 34.5-31.8 = 2.7 mm. Further, a polyethylene-coated steel pipe in which polyethylene is coated on a galvanized steel pipe has a pipe outer diameter larger than that of the galvanized steel pipe by the thickness of the polyethylene coating.
[0004]
In addition, the retaining member that prevents the connection pipe from coming off contacts the connection pipe, but the shape of the blade of the retaining member and the material of the retaining member differ depending on the type of the connection pipe, and the steel pipe is made of, for example, steel. The retaining member made of resin or brass is frequently used in the polyethylene pipe.
[0005]
[Problems to be solved by the invention]
In this way, it is necessary to use mechanical pipe fittings that have different outer diameters and that are compatible with the type of pipe to be connected, and mechanical pipe fittings that are compatible with two or three types of pipe materials and can join different types of pipes have also been put to practical use. Yes. However, all of the conventional mechanical pipe joints have a common joint body, and it is necessary to replace any or all of the cap nut, the watertight member, and the retaining member in accordance with the pipe type of the connecting pipe to be joined. For this reason, a mechanical pipe joint that can be applied to two or more types of connecting pipes having different diameters with a single pipe joint without replacing parts has not been put into practical use.
An object of the present invention is to provide a mechanical pipe joint that can join two or more types of connecting pipes having different diameters with a single structure without replacing parts.
[0006]
[Means for Solving the Problems]
A mechanical pipe joint according to the present invention includes a joint body (1) that forms a cavity (1a) into which a connection pipe (6) is inserted, and an end (6a) of the joint body (1) and the connection pipe (6). A sealing member (3) arranged between the cap body (1), a cap nut (2) connected to a threaded portion (1d) formed at an end (1b) of the joint body (1), and the joint body (1) A retaining member (5) that prevents the end (6a) of the connecting pipe (6) from slipping out by tightening the cap nut (2); The retaining member (5) has a joint gap that can be reduced or expanded, and can contact the outer surface of the connecting pipe (6) having a different diameter when the diameter is reduced or expanded. One of the members (5) has an outer contact surface (7) spaced from the joint body (1) side and an inner contact surface (8) on the joint body (1) side. The outer contact surface (7) and the inner contact surface (8) are inclined at different angles with respect to the central axis (1c) of the joint body (1), and the inner contact surface (8) is larger in diameter than the outer contact surface (7). . When joining a connecting pipe (6) with a large diameter, the outer contact surface (7) or the inner contact surface (8) provided on one of the cap nut (2) and the retaining member (5) is in contact with the other. When connecting the connecting pipe (6) having a small diameter, the inner contact surface (8) or the outer contact surface (7) provided on one of the cap nut (2) and the retaining member (5) is in contact with the other. Contact and prevent the connecting pipe (6) from coming out. Therefore, in the mechanical pipe joint according to the present invention, by selecting the outer contact surface (7) and the inner contact surface (8) provided on one of the cap nut (2) and the retaining member (5), the component is The connecting pipe (6) having a large diameter and the connecting pipe (6) having a small diameter can be joined without replacement and in a single structure. Further, since one of the cap nut (2) and the retaining member (5) is provided with the outer contact surface (7) and the inner contact surface (8) having different inclination angles, the retaining member (5) and the cap nut ( The axial length of the contact surface in 2) can be reduced. For this reason, it is possible to reduce the diameter of the retaining member (5) in accordance with the outer diameter of the connecting pipe (6) with a small number of rotations of the cap nut (2).
[0007]
In the embodiment of the present invention, the outer contact surface (7) forms an angle smaller than or larger than the inner contact surface (8) with respect to the central axis (1c) of the joint body (1). The cap nut (2) has an outer contact surface (7a) spaced from the joint body (1) side and an inner contact surface (8a) on the joint body (1) side, and the retaining member (5) is the joint body. It has an outer contact surface (7b) spaced from the (1) side and an inner contact surface (8b) on the joint body (1) side. The outer contact surface (7a) of the cap nut (2) and the outer contact surface (7b) of the retaining member (5) form substantially the same angle with respect to the central axis (1c) of the joint body (1), and the bag The inner contact surface (8a) of the nut (2) and the inner contact surface (8b) of the retaining member (5) form substantially the same angle, or the bag is formed with respect to the central axis (1c) of the joint body (1). The outer contact surface (7a) of the nut (2) and the inner contact surface (8b) of the retaining member (5) form substantially the same angle, and the inner contact surface (8a) of the cap nut (2) and the retaining contact The outer contact surface (7b) of the member (5) forms substantially the same angle. The outer contact surface (7) and the inner contact surface (8) form a conical surface or are formed by an arc-shaped cross section or a combination of a conical surface and an arc-shaped cross section.
[0008]
In another embodiment of the present invention, the other of the cap nut (2) and the retaining member (5) has an arcuate section or two or more arcuate sections with different radii of curvature. One or both of the cap nut (2) and the retaining member (5) may have at least three contact surfaces that are in contact with the other and have different angles. At least two blades (5a) having a triangular cross section are formed on the inner surface of the retaining member (5) contacting the outer surface of the connecting pipe (6), and the angle formed by two equal sides of each blade (5a) Is in the range of 45 ° to 100 °, and the interval between the vertices (5b) of each blade (5a) is larger than 1 mm.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the mechanical pipe joint according to the present invention will be described below with reference to FIGS.
[0010]
As shown in FIG. 1, a mechanical pipe joint according to the present invention includes a joint body (1) that forms a cavity (1a) into which a pair of connection pipes (6) are inserted, a joint body (1), and a connection pipe ( 6) the sealing member (3) disposed between the end (6a) and the cap nut (2) connected to the threaded portion (1d) formed on the end (1b) of the joint body (1). ), A retaining member (5) that prevents the end (6a) of the connecting pipe (6) from coming out by tightening the cap nut (2) against the joint body (1), and a retaining member (5) and the joint body A washer (4) disposed between the end (1b) of (1). The joint body (1) is formed of cast iron in a substantially cylindrical shape, but may have an elbow shape, a tee (T) shape, or a cross shape, and one or more of the connecting portions may be a male screw or a female screw for screw fastening. The seal member (3) is formed of a rubber material that forms a watertight packing and has elasticity. The cap nut (2), the washer (4), and the retaining member (5) are made of iron such as iron or stainless steel, cast iron, brass or the like.
[0011]
Although not shown, the retaining member (5) is formed in a ring shape, but a notch, that is, a joint gap that can be reduced or expanded is provided in a part of the circumference. For this reason, the retaining member (5) can contact the outer surface of the connecting pipe (6) having a different diameter when the diameter is reduced or when the diameter is increased.
[0012]
In the embodiment shown in FIG. 1, the cap nut (2) has an outer contact surface (7a) spaced from the joint body (1) side and an inner contact surface (8a) on the joint body (1) side, The retaining member (5) has an outer contact surface (7b) spaced from the joint body (1) side and an inner contact surface (8b) on the joint body (1) side. The outer contact surface (7a) of the cap nut (2) and the outer contact surface (7b) of the retaining member (5) against the central axis (1c) of the joint body (1) are the tightening force of the cap nut (2). In order to provide a force that prevents the connecting member (5) from slipping out of the retaining member (5), substantially the same angle is formed within an angle range of 8 to 30 °, preferably 10 to 20 °. When the outer contact surfaces (7a), (7b) are less than 8 °, the retaining force (5) is closely attached to the connecting pipe (6), and then the specified holding force to prevent the connecting pipe (6) from coming out. Since the rotational speed of tightening the cap nut (2) is increased in order to generate the above, it is necessary to sufficiently lengthen the thread portions of the joint body (1) and the cap nut (2). Further, since the retaining member (5) needs to be formed long in the axial direction, the entire joint becomes large, which is disadvantageous from the viewpoint of material cost and processing cost.
[0013]
The inner contact surface (8a) of the cap nut (2) and the inner contact surface (8b) of the retaining member (5) form substantially the same angle within an angle range of 15 ° to 40 °. If the angle of the inner contact surfaces (8a) and (8b) exceeds 40 °, the force to hold down the connecting pipe (6) of the retaining member (5) obtained from the tightening force of the cap nut (2) will be small. As a result, the ability to prevent the connecting pipe (6) from coming out decreases. In order to increase the pull-out prevention force of the connecting pipe (6), it is necessary to set the tightening force of the cap nut (2) to a predetermined level or more, resulting in poor workability. In the embodiment shown in FIG. 1, the inner contact surfaces (8a) and (8b) are formed at a larger angle than the outer contact surfaces (7a) and (7b). When the connecting pipe (6) having a large diameter is joined, the outer contact surface (7a) of the cap nut (2) and the outer contact surface (7b) of the retaining member (5) come into contact with each other. Further, when connecting the connecting pipe (6) having a small diameter, the inner contact surface (8a) of the cap nut (2) and the inner contact surface (8b) of the retaining member (5) come into contact with each other, and the cap nut (2 ) Reduces the diameter of the retaining member (5) having a joint gap, and the retaining member (5) contacts the connecting pipe (6) to prevent the connecting pipe (6) from coming out. The outer contact surfaces (7a) and (7b) are intended for steel pipes with the same nominal diameter and large outer diameter, for example, and the inner contact surfaces (8a) and (8b) are resins such as vinyl chloride pipes or polyethylene pipes with small outer diameters. This is the case for tubes. When using a steel pipe with a large outer diameter as the connection pipe (6), the outer contact surface (7a) of the cap nut (2) and the outer contact surface (7b) of the retaining member (5) are tightened by tightening the cap nut (2). ) Comes into contact with the surface of the connecting pipe (6). When a resin pipe with a small outer diameter is used as the connecting pipe (6), the contact portion is changed from the outer contact surface (7a), (7b) to the inner contact surface (8a), (8b) by tightening the cap nut (2). ) At the inner contact surfaces (8a) and (8b), the retaining member (5) is further reduced in diameter so that the retaining member (5) contacts the surface of the connecting pipe (6). Thus, by selecting the outer contact surface (7a) and inner contact surface (8a) of the cap nut (2) and the outer contact surface (7b) and inner contact surface (8b) of the retaining member (5), The connecting pipe (6) having a large diameter and the connecting pipe (6) having a small diameter can be joined with a single structure without changing parts. The outer contact surface (7a) and the inner contact surface (8a) with different inclination angles are provided on the cap nut (2), and the outer contact surface (7b) and the inner contact surface (8b) with different inclination angles are prevented from coming off. Since it is provided on the member (5), the axial length of the contact surface between the retaining member (5) and the cap nut (2) can be reduced. For this reason, it is possible to reduce the diameter of the retaining member (5) in accordance with the outer diameter of the connecting pipe (6) with a small number of rotations of the cap nut (2).
[0014]
FIG. 3 shows a second embodiment in which the angle of the outer contact surface (7b) of the retaining member (5) is larger than that of the inner contact surface (8b). In FIG. 3, the outer contact surface (7a) of the cap nut (2) and the inner contact surface (8b) of the retaining member (5) have substantially the same angle with respect to the central axis (1c) of the joint body (1). The outer contact surface (7b) of the retaining member (5) is formed at substantially the same angle as the inner contact surface (8a) of the cap nut (2). Also in the embodiment of FIG. 3, the outer contact surface (7a) and inner contact surface (8a) of the cap nut (2) and the outer contact surface (7b) and inner contact surface (8b) of the retaining member (5) are selected. Thus, it is possible to join the connecting pipe (6) having a large diameter and the connecting pipe (6) having a small diameter with a single structure without exchanging components, and the same operation as that of the embodiment of FIG. An effect is obtained. FIG. 3 shows a case where an outer surface coated steel pipe having a large outer diameter and a galvanized steel pipe having a small outer diameter are targeted. The angle of the inner contact surface (8b) with respect to the center axis (1c) is 10 ° to 20 ° because the tightening force of the cap nut (2) is the force by which the retaining member (5) restrains the connecting pipe (6). The range of is preferable.
[0015]
In the outer contact surface (7) and the inner contact surface (8) where the cap nut (2) and the retaining member (5) are in contact, the shape of the cap nut (2) does not necessarily correspond to the surface of the retaining member (5). It is not necessary to form the contact surface. For example, FIG. 5 shows a third embodiment according to the present invention in which the surface where the cap nut (2) contacts the retaining member (5) has an arcuate cross section. On the contrary, the portion of the retaining member (5) that contacts the cap nut (2) may have an arc shape. FIG. 6 shows a fourth embodiment according to the present invention in which the surface of the retaining member (5) that contacts the cap nut (2) has an arcuate cross section. In both the third and fourth embodiments, the retaining member (5) is reduced in diameter by tightening the cap nut (2), but the reduction ratio is determined by the tightening amount of the cap nut (2). In contrast, it is not constant. When the arcuate cross sections are combined in this way, an arbitrary diameter reduction amount of the retaining member (5) can be set with respect to the tightening amount of the cap nut (2). The same is true even if the cap nut (2) and the retaining member (5) are both formed with an arcuate section or two or more arcuate sections with different radii of curvature. If one or both of the cap nut (2) and retaining member (5) have an arc shape, the surface that comes into contact with the retaining member (5) will be smaller, and the force to restrain the retaining member (5) will be unstable. Become. Therefore, an arc shape that can stably convert the tightening force of the cap nut (2) into the diameter reducing force of the retaining member (5) is preferable.
[0016]
In the fifth embodiment shown in FIG. 7, at least two, for example, three blades (5a) having a triangular cross section are formed on the inner surface of the retaining member (5) that contacts the outer surface of the connecting pipe (6). When the cap nut (2) is tightened, the blade (5a) bites into the outer surface of the connection pipe (6). The angle formed by two equal sides of each blade (5a) is in the range of 45 ° to 100 °, and the interval between the vertices (5b) is greater than 1 mm. The length of the outer contact surface (7b) of the retaining member (5) can secure the amount of movement of the cap nut (2) necessary for the blade (5a) to sufficiently bite into the outer surface of the connecting pipe (6) and The length is such that the contact between the cap nut (2) and the outer contact surface (7b) of the retaining member (5) can be maintained. When the cap nut (2) is tightened, the outer contact surface (7a) and inner contact surface (8a), the outer contact surface (7b) and inner contact surface (8b), the outer contact surface (7a) and inner contact surface (8b) ) Or the inner contact surface (8a) and the outer contact surface (7b) are in contact with each other, the retaining member (5) to be reduced in diameter comes into contact with the surface of the connecting pipe (6), and then the blade (5a) Bites into the outer surface of the connecting pipe (6). The length of the outer contact surface (7b) and inner contact surface (8b) of the retaining member (5) is such that the retaining member (5) is sufficiently reduced in diameter and the blade (5a) is sufficient for the connecting pipe (6). It is the length to dig into. Also, the angle of the inner contact surface (8b) may be larger than that of the outer contact surface (7b). The resin pipe is lower in hardness than the steel pipe, and the blade (5a) of the retaining member (5) can be sufficiently bited into the outer surface of the resin pipe with a pressing force smaller than that of the steel pipe. The angle of the outer contact surface (7b) and the inner contact surface (8b) with respect to the central axis (1c) is such that a force is applied so that the blade (5a) of the retaining member (5) sufficiently bites into the resin part, preferably It may be in the range of 15 ° to 40 °. The inner contact surface (8b) is intended for a steel pipe with a small outer diameter, and the contact portion between the cap nut (2) and the retaining member (5) is tightened with the cap nut (2), so that the outer contact surface (7b) To the inner contact surface (8).
[0017]
When the connecting pipe (6) is a steel pipe, it can be pulled out more than specified if the retaining member (5) has sufficient force to hold the steel pipe in any blade shape, but it can be connected with a resin-coated steel pipe such as a polyethylene pipe. Since it is necessary for the blade (5a) to bite into the connecting tube (6) rather than the force to hold down the tube (6), the tip of the blade (5a) is sharp to some extent, and the tip angle is preferably 45 ° to 100 °. If it is larger than 100 °, the blade (5a) hardly bites into the connecting pipe (6). When the tip angle of the blade (5a) is 60 °, it is preferably an equilateral triangle, and at other tip angles, it is preferably an isosceles triangle. When the shape of the blade (5a) is symmetrical, the processing of the blade (5a) is facilitated, and the processing cost can be reduced compared to other blade shapes. In order to separate the adjacent blades (5a) at a constant interval, the interval between the vertices of the blades (5a) is made larger than 1 mm. If the tip angle of the blade (5a) is 90 ° or more in a continuous shape, the entire blade (5a) is deformed to make it difficult for the blade (5a) to bite into the connecting pipe (6). When the interval between the vertices of the blade (5a) is larger than 1 mm, the blade (5a) bites into the outer surface of the connecting pipe (6), and a sufficient pull-out preventing force is obtained. It is apparent that the blade shape of the present embodiment is not limited to the shape shown in FIG. 7, but other blade shapes that are generally put into practical use can be formed on the retaining member (5).
[0018]
Thus, in the present invention, one of the cap nut (2) and the retaining member (5) includes an outer contact surface (7) spaced from the joint body (1) side and an inner contact on the joint body (1) side. Surface (8). The outer contact surface (7) and the inner contact surface (8) are inclined at different angles with respect to the central axis (1c) of the joint body (1), and the inner contact surface (8) is larger in diameter than the outer contact surface (7). . When joining the large diameter connecting pipe (6), the outer contact surface (7) provided on one of the cap nut (2) and the retaining member (5) is in contact with the other, and the small diameter connecting pipe ( When joining 6), the inner contact surface (8) provided on one of the cap nut (2) and the retaining member (5) comes into contact with the other to prevent the connecting pipe (6) from coming out. Therefore, in the mechanical pipe joint according to the present invention, by selecting the outer contact surface (7) and the inner contact surface (8) provided on one of the cap nut (2) and the retaining member (5), the component is The connecting pipe (6) having a large diameter and the connecting pipe (6) having a small diameter can be joined without replacement and in a single structure. Further, since one of the cap nut (2) and the retaining member (5) is provided with the outer contact surface (7) and the inner contact surface (8) having different inclination angles, the retaining member (5) and the cap nut ( The axial length of the contact surface in 2) can be reduced. For this reason, it is possible to reduce the diameter of the retaining member (5) in accordance with the outer diameter of the connecting pipe (6) with a small number of rotations of the cap nut (2). The outer contact surface (7) and the inner contact surface (8) form a conical surface, or can be formed by an arc-shaped cross section or a combination of a conical surface and an arc-shaped cross section. The outer contact surface (7) may have an angle smaller than or larger than the inner contact surface (8) with respect to the central axis (1c) of the joint body (1).
[0019]
In the embodiment of the present invention, the following effects can be obtained.
[1] By selecting the outer contact surface (7) and the inner contact surface (8) provided on one of the cap nut (2) and the retaining member (5), a single unit can be used without changing parts. The connecting pipe (6) having a large diameter and the connecting pipe (6) having a small diameter can be joined.
[2] Since the outer contact surface (7) and the inner contact surface (8) having different inclination angles are provided on one of the cap nut (2) and the retaining member (5), the retaining member (5) and the cap nut The axial length of the contact surface in (2) can be reduced.
[3] The retaining member (5) can be reduced in diameter with a small number of rotations of the cap nut (2) in conformity with the outer diameter of the connecting pipe (6).
[4] Corresponding to the diameter or type of the connecting pipe (6), it is possible to obtain the tightening force of the retaining member (5) against the slipping-in preventing force of the connecting pipe (6).
[5] The shape of the contact portion of the retaining member (5) with respect to the connecting pipe (6) does not depend on the tube type, and a sufficient slip-off preventing force can be obtained.
[6] It is not necessary to replace the cap nut (2) and the retaining member (5) for different tube types, and the workability is excellent.
[7] A sufficient pull-out preventing force can be obtained even for different tube types, and a pipe joint excellent in pull-out preventing performance can be obtained.
[8] The difference in the pipe diameter can be absorbed with a smaller number of rotations of the cap nut (2).
[9] The cap nut (2) and the threaded portion of the joint body (1) do not need to be formed longer than necessary, and the retaining member (5) may be the minimum necessary length.
[10] The entire pipe joint can be reduced in size and weight, and handling and workability can be improved.
The embodiment of the present invention can be modified. For example, one or both of the cap nut (2) and the retaining member (5) have at least three contact surfaces that are in contact with the other and have different angles, for example, an outer contact surface, an intermediate contact surface, and an inner contact surface. Also good.
[0020]
[Example 1]
FIG. 2 shows a dimensional diagram of the vicinity of the portion of the retaining member (5) shown in FIG. 1 and the portion of the cap nut (2) that contacts the retaining member (5). The representative dimensions shown in FIG. 2 are L ₁ = 5 mm, L ₂ = 4 mm, D ₁ = 37.4 mm, D ₂ = 37.8 mm, H ₁ = 2 mm, H ₂ = 2 mm. The angle θ ₁ of the outer contact surface (7) is changed in the range of 10 ° to 20 °, the angle θ ₂ of the inner contact surface (8) is 25 °, and a galvanized steel pipe having a nominal diameter of 25, a rigid polyvinyl chloride pipe for water supply, The results of the pull-out preventing force of the connecting pipe (6) measured by using a tensile tester with each connecting polyethylene pipe for water supply are shown in the numbers 1 to 12 in the table below. The pull-out prevention force (kN) measured by the conventional joint for each pipe type measured as a comparative example was 16.8 for the galvanized steel pipe, 9.9 for the hard vinyl chloride pipe, and 2.2 for the polyethylene pipe. As is clear from the table below, in the steel pipe connection pipe (6), the pull-out prevention force decreases somewhat as the angle of the outer contact surface (7) increases. Equivalent characteristics can be obtained.
[0021]
[Table 1]

Similar pull-out preventing power was obtained for the hard polyvinyl chloride pipe for water supply and the polyethylene pipe for water supply.
[0022]
[Example 2]
In the second embodiment, the angle θ ₁ of the outer contact surface (7) is 15 °, and the angle θ ₂ of the inner contact surface (8) is 25 ° to 40 °. The results of the pulling-in preventing force of the connecting pipe (6) measured using a tensile tester are shown in numbers 13 to 20 in the above table. The values of Nos. 13 to 20 are substantially the same as the pull-out preventing force of the conventional pipe type joint.
[0023]
[Example 3]
FIG. 4 shows a dimensional diagram of the vicinity of the portion of the retaining member (5) shown in FIG. 3 and the retaining member (5) of the cap nut (2) that contacts the retaining member (5). The typical dimensions shown in FIG. 4 are L ₃ = 3.5 mm, L ₄ = 5.5 mm, D ₃ = 38 mm, D ₄ = 41.2 mm, H ₃ = 2 mm, and H ₄ = 2 mm. Connect the galvanized steel pipe and polyethylene-coated steel pipe of nominal diameter 25 with the angle θ ₃ of the outer contact surface (7) being 35 ° and the angle θ ₄ of the inner contact surface (8) being 5 °, and using a tensile tester. The measured pull-out preventing force (kN) of the connecting pipe (6) was 17.7 for the galvanized steel pipe and 6.3 for the polyethylene-coated steel pipe. Further, as a comparative example, the pulling-in preventing force (kN) by a conventional joint dedicated to each pipe type was 16.8 for a galvanized steel pipe and 6.8 for a polyethylene-coated steel pipe. Thus, in the second embodiment according to the present invention, the same characteristics as the pull-out preventing force of the conventional pipe type joint can be obtained.
[0024]
[Example 4]
In the fifth embodiment shown in FIG. 7, the width of the retaining member (5) is 9 mm, and the distance between the blade tips is 3 mm. The tip angle of the blade (5a) is 45 °, 60 °, 90 °, 100 °, 120 ° and is attached to a joint with a nominal diameter of 20, and a galvanized steel pipe and a polyethylene pipe with a nominal diameter of 20 are connected and a tensile tester is used. The tube pull-out inhibiting force was measured. When galvanized steel pipes are connected, when the blade tip angle is 45 °, 60 °, 90 °, 100 °, and 120 °, the pull-out preventing force (kN) is 16.2; 15.9; 16.7; 16.1; and 16.3. When a polyethylene pipe is connected, when the blade tip angle is 45 °, 60 °, 90 °, 100 °, and 120 °, the pull-out preventing force (kN) is 2.4; 2.3; 2.2; 2 .2; and 0.8. In the present embodiment, the retaining member (5) showed almost the same retention preventing force as that of the conventional joint, regardless of the tip angle of the blade (5a) with respect to the galvanized steel pipe. In addition, the polyethylene tube showed a blocking force similar to that of the conventional joint by the blade tip angle up to 100 °. On the other hand, when a polyethylene pipe is connected using a conventional retaining member for a steel pipe, the retaining force is 0.6 kN. Further, when the steel pipe was connected using the retaining member (5) for the polyethylene pipe, the retaining prevention force was 15.9 kN. When the retaining members (5) of different applicable pipe types were used, the retaining strength of the retaining tube was extremely reduced particularly when the polyethylene tube was connected by the retaining member (5) for steel pipes. Thus, in the present invention, a sufficient pulling-in preventing force was obtained even with a steel pipe and a polyethylene pipe.
[0025]
【The invention's effect】
As described above, in the mechanical pipe joint according to the present invention, it is not necessary to replace the cap nut and the retaining member for different pipe types, and the workability is excellent. In addition, a sufficient pull-out preventing force can be obtained for different tube types, and a pipe joint having excellent performance can be obtained. Furthermore, since the difference in pipe diameter can be absorbed with a small number of cap nut rotations, it is not necessary to form the cap nut and the threaded portion of the joint body longer than necessary, and the retaining member may be the minimum necessary length. The entire pipe joint can be reduced in size and weight, and the handling and workability can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a mechanical pipe joint according to the present invention. FIG. 2 is a dimensional diagram of a retaining member and a cap nut shown in FIG. 1. FIG. 3 is a mechanical pipe showing a second embodiment of the present invention. Cross-sectional view of the joint [FIG. 4] Dimensional diagram of the retaining member and the cap nut portion shown in FIG. 3 [FIG. 5] A sectional view of the retaining member and the cap nut portion according to the third embodiment of the present invention [FIG. A sectional view of a retaining member and a cap nut portion showing a fourth embodiment according to the present invention. FIG. 7 is a sectional view of a retaining member showing a fifth embodiment according to the present invention.
(1) ・ ・ Fitting body, (2) ・ Cap nut, (3) ・ Seal member, (4) ・ Washer, (5) ・ Retaining member,

Claims (8)

A joint body that forms a cavity for inserting the connection pipe, a seal member that is disposed between the joint body and the end of the connection pipe, and a cap nut that is coupled to a thread formed at the end of the joint body And a mechanical pipe joint having a retaining member that prevents the end of the connecting pipe from coming out by tightening the cap nut against the joint body,
The retaining member has a joint gap that can be reduced or expanded, and can contact the outer surface of the connecting pipe having a different diameter when reduced or expanded.
One of the cap nut and the retaining member has an outer contact surface spaced from the joint body side, and an inner contact surface on the joint body side,
The outer contact surface and the inner contact surface are inclined at different angles with respect to the central axis of the joint body,
The inner contact surface is larger in diameter than the outer contact surface,
When joining a connecting pipe having a large diameter, the outer contact surface or the inner contact surface provided on one of the cap nut and the retaining member comes into contact with the other,
When joining a connecting pipe with a small diameter, the inner contact surface or the outer contact surface provided on one of the cap nut and the retaining member abuts against the other to prevent the connecting tube from coming out. Pipe fittings. The mechanical pipe joint according to claim 1, wherein the outer contact surface forms an angle smaller than or larger than the inner contact surface with respect to the central axis of the joint body. The cap nut has an outer contact surface spaced from the joint body side and an inner contact surface on the joint body side, and the retaining member has an outer contact surface spaced from the joint body side and an inner contact surface on the joint body side. The outer contact surface of the cap nut and the outer contact surface of the retaining member form substantially the same angle with respect to the central axis of the joint body, and the inner contact surface of the cap nut and the inner contact surface of the retaining member are substantially The mechanical pipe joint according to claim 1 or 2, wherein the same angle is formed at the same time. The cap nut has an outer contact surface spaced from the joint body side and an inner contact surface on the joint body side, and the retaining member has an outer contact surface spaced from the joint body side and an inner contact surface on the joint body side. The outer contact surface of the cap nut and the inner contact surface of the retaining member form substantially the same angle with respect to the central axis of the joint body, and the inner contact surface of the cap nut and the outer contact surface of the retaining member are substantially The mechanical pipe joint according to claim 1 or 2, wherein the same angle is formed at the same time. The mechanical pipe joint according to claim 1 or 2, wherein the other of the cap nut and the retaining member has an arcuate section or two or more arcuate sections having different radii of curvature. The mechanical pipe joint according to any one of claims 1 to 5, wherein one or both of the cap nut and the retaining member have at least three contact surfaces that abut against the other and have different angles. The mechanical pipe joint according to any one of claims 1 to 6, wherein the outer contact surface and the inner contact surface form a conical surface, or are formed by an arc-shaped cross section or a combination of a conical surface and an arc-shaped cross section. At least two blades having a triangular cross section are formed on the inner surface of the retaining member that contacts the outer surface of the connecting pipe, and the angle formed by two equal sides of each blade is in the range of 45 ° to 100 °. The mechanical pipe joint according to any one of claims 1 to 7, wherein the interval is larger than 1 mm.

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