Joint pipe
AssigneesHigashio Mech Co., Ltd., Daikin Industries, Ltd.
InventorAkio YASUDA
Life of this patent
Estimating the term…
Abstract
[Problem] To provide a pipe joint allowing reliable connection to a pipe P without flaring. [Means of solving problem] The pipe joint includes a flare joint body 1F, a cap nut 2, and a stop ring 3. A curved pressure-contacting slope surface 32 of the stop ring 3 contacts a slope surface 5 with reduced-diameter tip of the flare joint body 1F under pressure to establish sealing by means of mutual contact between metallic surfaces. The pipe P is grasped in a tightly pressure-contacting state using a back tooth and a front tooth formed at a tip head 37 of a substantially cylindrical thin part 35 of the stop ring 3.
Claims39
A pipe joint comprising:
- a flare joint body (1F) including a male screw part (9) and a slope surface (5) with reduced-diameter tip;
- a cap nut (2) including a female screw part (12) threadedly attached to the male screw part (9) and provided at a base end of a hole part (11), and a housing space part (E) with a constant diameter section (14), a stepped section (15), and a tapered section (17) with reduced-diameter tip provided at an intermediate area of the hole part (11);
- and
- a stop ring (3) fitted in the housing space part (E), including a base-end pressure-contacting slope surface (32) contacting the slope surface (5) with reduced-diameter tip under pressure, and having a tip provided with a plastically-deformable and substantially cylindrical thin part (35) and a pipe extraction preventing tooth part (36) formed at a tip head (37) of the substantially cylindrical thin part (35), wherein
- the tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36), the back tooth (36B) has a trapezoidal or substantially trapezoidal sectional shape with a linear first tip side (41) as an upper side, and the front tooth (36F) has a trapezoidal or substantially trapezoidal sectional shape with a linear second tip side (42) as an upper side, and
- as the cap nut (2) threadedly moves forward, the first tip side (41) of the back tooth (36B) and the second tip side (42) of the front tooth (36F) of the stop ring (3) come into a state of tightly contacting an outer peripheral surface (10A) of a straight tip part (10) of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z).
A pipe joint comprising a joint body (1) that itself includes an extraction preventing tooth part (36) as an integral part that comes into a state of tightly contacting an outer peripheral surface (10A) of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z) in response to threaded movement of a cap nut (2) toward the joint body (1).
A pipe joint comprising a joint body (1) that itself includes an extraction preventing tooth part (36) as an integral part that comes into a state of tightly contacting an outer peripheral surface (10A) of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z) in response to threaded movement of a cap nut (2) toward the joint body (1), wherein
- the extraction preventing tooth part (36) is formed at a tip of a substantially cylindrical thin part (35) of a projecting shape provided at a tip of the joint body (1),
- the extraction preventing tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36), the back tooth (36B) has a trapezoidal or substantially trapezoidal sectional shape with a linear first tip side (41) as an upper side, the front tooth (36F) has a trapezoidal or substantially trapezoidal sectional shape with a linear second tip side (42) as an upper side, and as the cap nut (2) threadedly moves forward, the first tip side (41) of the back tooth (36B) and the second tip side (42) of the front tooth (36F) of the joint body (1) come into a state of tightly contacting the outer peripheral surface (10A) of the connection target pipe (P) under pressure to generate pipe extraction resistance (Z).
A pipe joint comprising:
- a flare joint body (1F) including a male screw part (9) and a slope surface (5) with reduced-diameter tip;
- a cap nut (2) including a female screw part (12) threadedly attached to the male screw part (9) and provided at a base end of a hole part (11), and a housing space part (E) with a constant diameter section (14), a stepped section (15), and a tapered section (17) with reduced-diameter tip provided at an intermediate area of the hole part (11);
- and
- a stop ring (3) fitted in the housing space part (E), including a base-end pressure-contacting slope surface (32) contacting the slope surface (5) with reduced-diameter tip under pressure, and having a tip provided with a plastically-deformable and substantially cylindrical thin part (35) and a pipe extraction preventing tooth part (36) formed at a tip head (37) of the substantially cylindrical thin part (35), wherein
- the tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36),
- as the cap nut (2) threadedly moves forward, a first tip side (41) of the back tooth (36B) and a second tip side (42) of the front tooth (36F) of the stop ring (3) come into a state of tightly contacting an outer peripheral surface (10A) of a straight tip part (10) of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z),
- the stop ring (3) includes a base inner diameter part (28) to which the pipe (P) is to be inserted and a base outer diameter part (24) fitted in housing space part (E) of the cap nut (2), and the thickness dimension of a base short cylindrical part (50) defined by the base inner diameter part (28) and the base outer diameter part (24) called (T50) and an average thickness dimension of the substantially cylindrical thin part (35) called (T3) are set in such a manner as to establish the following formula 1:
- 0.40·T50≤T35≤0.75·T50. (Formula 1)
A pipe joint comprising:
- a flare joint body (1F) including a male screw part (9) and a slope surface (5) with reduced-diameter tip;
- a cap nut (2) including a female screw part (12) threadedly attached to the male screw part (9) and provided at a base end of a hole part (11), and a housing space part (E) with a constant diameter section (14), a stepped section (15), and a tapered section (17) with reduced-diameter tip provided at an intermediate area of the hole part (11);
- and
- a stop ring (3) fitted in the housing space part (E), including a base-end pressure-contacting slope surface (32) contacting the slope surface (5) with reduced-diameter tip under pressure, and having a tip provided with a plastically-deformable and substantially cylindrical thin part (35) and a pipe extraction preventing tooth part (36) formed at a tip head (37) of the substantially cylindrical thin part (35), wherein
- the tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36),
- the back tooth (36B) has a substantially trapezoidal sectional shape and a first tip side (41) composed of an upper side of the substantially trapezoidal shape includes a short posterior half side part (63) and a tall anterior half side part (64) defined across a curved intermediate level difference part (62), and
- the front tooth (36F) has a substantially trapezoidal sectional shape and a second tip side (42) composed of an upper side of the substantially trapezoidal shape has a polygonal line shape with a short posterior half side part (66) and a tall anterior half side part (67) defined across a slope surface (65) sloping downward and backward.
A pipe joint comprising a joint body (1) that itself includes an extraction preventing tooth part (36) as an integral part that comes into a state of tightly contacting an outer peripheral surface of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z) in response to threaded movement of a cap nut (2) toward a male screw part (9) of the joint body (1), wherein
- the extraction preventing tooth part (36) is provided at a tip of a substantially cylindrical thin part (35) projecting continuously from a tip surface (7A) of a connection tube (7) with an outer periphery provided with the male screw part (9),
- the tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36), and
- an average thickness dimension of the substantially cylindrical thin part (35) called (T35) and an average thickness dimension of the connection tube (7) called (T7) are set in such a manner as to establish the following formula 2:
- 0.40·T7≤T35≤0.75·T7. (Formula 2)
A pipe joint comprising a joint body (1) that itself includes an extraction preventing tooth part (36) as an integral part that comes into a state of tightly contacting an outer peripheral surface of a connection target pipe (P) under pressure to generate pipe extraction resistance (Z) in response to threaded movement of a cap nut (2) toward a male screw part (9) of the joint body (1), wherein
- the extraction preventing tooth part (36) is provided at a tip of a substantially cylindrical thin part (35) projecting continuously from a tip surface (7A) of a connection tube (7) with an outer periphery provided with the male screw part (9),
- the tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36),
- the back tooth (36B) has a substantially trapezoidal sectional shape and a first tip side (41) composed of an upper side of the substantially trapezoidal shape includes a short posterior half side part (63) and a tall anterior half side part (64) defined across a curved intermediate level difference part (62), and
- the front tooth (36F) has a substantially trapezoidal sectional shape and a second tip side (42) composed of an upper side of the substantially trapezoidal shape has a polygonal line shape with a short posterior half side part (66) and a tall anterior half side part (67) defined across a slope surface (65) sloping downward and backward.
Dependencies are inferred from the claim text.