JP5424193B2 - Fitting - Google Patents

Description

  The present invention relates to a joint, and more particularly to a joint for connecting pipes used in a hot water circulation heating device or the like.

Patent application title: A joint for connecting an outdoor pipe extending from an outdoor unit and an indoor pipe extending from a hot water circulation heating device installed in a room such as a panel heater, and having the same female joint as a configuration No. 4083523 has been invented (Patent Document 1).
In this case, as shown in FIG. 7, one end open portion opposite to the pipe connection end of one female joint (21) and one end open opposite to the pipe connection end of the other female joint (22). The inner joint (30) is inserted into the female joints (21) and (22) in such a manner that about half each is inserted into the female joints (21) and (22).

Outer peripheral flanges (23) and (24) protrude from the open ends of the female joints (21) and (22), respectively, and chamfered portions (25) are formed at the inner peripheral end edges. By forming the chamfered portion (25), the O-ring (10) externally fitted to the inner joint (30) is inserted when the inner joint (30) is inserted into each of the female joints (21) and (22). The inner joint (30) can be connected to the female joint (21) (22) smoothly without being caught on the inner peripheral edge of the open end of the female joint (21) (22) and without damaging the O-ring (10). ) Can be inserted.
Then, in order to prevent the inner joint (30) from moving in the female joints (21) and (22), the inclined surface (32a) corresponding to each of the chamfered portions (25) facing each other at the center of the outer peripheral surface of the inner joint (30). ) (32b) is raised.

  When one end of the inner joint (30) is inserted into one female joint (21), the slope (32a) on one side of the engagement protrusion (31) comes into contact with the chamfered portion (25) of the female joint (21), When the other end of the joint (30) is inserted into the other female joint (22), the slope (32b) on the other side of the engaging projection (31) comes into contact with the chamfered portion (25) of the female joint (22). In this way, the chamfered portion (25) of both female joints (21) and (22) abuts on both inclined surfaces (32a) and (32b) of the base portion of the engaging projection (31) of the inner joint (30), respectively. The inner joint (30) inserted into the pair of female joints (21) and (22) can be housed in a stable state without being displaced or rattling in the butting portion (2).

  In this state, the fitting (3) having a substantially U-shaped cross section as shown in FIG. 8 is attached to the abutting portion (2) of the female joints (21) and (22). An opening (33) is formed in the connection fitting (3), and the connection fitting (3) is fitted into the opening (33) so that the outer peripheral flanges (23) and (24) of the butt portion (2) are fitted. ) Is fitted onto the butt portion (2). Thereby, the connection of the pair of female joints (21) and (22) is completed.

Japanese Patent No. 4083523

However, in the conventional joint described above, the chamfered portions (25) of the female joints (21) and (22) are in contact with the inclined surfaces (32a) and (32b) of the engaging projections (31) of the inner joint (30). Since it is a connection mode, when the female joints (21) and (22) rotate relative to each other, the chamfered portions (25) of the female joints (21) and (22) The chamfered portion (25) may be scratched by friction or wear powder may be generated due to rubbing against (32).
When the joint is disassembled during maintenance of the hot water circulating heating equipment including the joint or when the chamfered part (25) of the female joint (21) (22) is scratched or worn powder adheres, When reconnecting the inner joint (30) to the female joint (21) (22), the O-ring (10) rubs against the chamfer (25), so the surface of the O-ring (10) is damaged. Or wear powder adheres. In such a case, a problem arises in the sealing performance of the O-ring (10), and it is necessary to ensure a watertight state between the inner peripheral surface of the female joint (21) (22) and the outer peripheral surface of the inner joint (30). It becomes difficult and fluid may leak out from the butt portion (2) of the female joint (21) (22).

  According to the present invention, a pair of female joints having an outer peripheral flange projecting from one end open portion of a hollow cylinder and a chamfered portion formed at an inner peripheral end edge thereof, and the female in a state in which the outer peripheral flanges face each other In the “joint comprised of an inner joint inserted into the butted portion of the joint via an O-ring and a coupling fitting that is externally fitted to the butted portion and connects the pair of female joints”, the pair of female joints are It is an object to prevent the chamfered portion from being scratched or attached with wear powder even if it is rotated.

(1) The joint according to the first aspect of the present invention is as follows: "A thin annular flange is provided in the circumferential direction at the center of the outer peripheral surface of the inner joint;
The outer diameter of the annular flange is set larger than the maximum diameter of the chamfered portion,
The shape of the base of the annular flange is a substantially triangular cross section having slopes along the chamfered part on both sides,
A gap is formed between the chamfered portion and the inclined surface in a state where the connection fitting is mounted.

  An outer peripheral flange projects from the open end of each female joint, and a chamfered portion is formed at the inner peripheral edge of the female joint in order to smoothly insert the inner joint with an O-ring. When one end of the inner joint is inserted into the open end of one female joint, the outer flange of the female joint comes into contact with the annular flange projecting from the center of the outer peripheral surface of the inner joint, preventing further insertion. Is done. Similarly, the other end of the inner joint is inserted into the other female joint until the outer peripheral flange contacts the annular flange. Thus, the pair of female joints are connected to each other in a watertight state via the inner joint, and the outer peripheral flange is abutted via the annular flange. And a connection state is hold | maintained by attaching a connection metal fitting to this butt | matching part. Since a gap is formed between the chamfered portion of the female joint and the outer peripheral surface of the inner joint in the connected state, the chamfered portion is not in contact with anything. Thus, the relative rotation of the female joint in this connected state prevents the chamfered portion from rubbing anywhere, even if the inner joint rotates relative to the female joint. Does not occur.

Further, the shape of the base of the annular flange portion, and a substantially triangular cross section having an inclined surface along the chamfered portion on both sides, the gap, it is so arranged is formed between said beveled portion and the slope The annular flange portion has a cross-sectional shape in which a thin flange portion protrudes from the top of a substantially triangular cross section, and the substantially triangular cross section is substantially surrounded by a chamfered portion when the outer peripheral flanges of the female joint are abutted with each other. It is stored in a triangular space, and the thin-walled flange portion is interposed between the opposing surfaces of the outer peripheral flange. A gap is formed between the inclined surface formed on both sides of the annular flange and the chamfered portion so as not to contact with each other in the state of being accommodated in the space.

(2) The joint of the present invention according to claim 2 is the joint according to claim 1, wherein “when the opposing surface of the outer peripheral flange is provided with an annular recess following the chamfered portion, the opposing surfaces are butted against each other. In addition, the entire annular flange portion can be stored in an annular space portion surrounded by the annular recess and the chamfered portion ”, and the chamfered portion is formed on the opposing surfaces of the outer peripheral flanges of the pair of female joints. Then, when the outer peripheral flanges are abutted with each other, an annular space portion surrounded by the annular recess and the annular recess is formed following the substantially triangular space surrounded by the chamfered portion. Is done. The entire annular collar can be accommodated in the annular space.

  As described above, according to the first aspect of the present invention, even if the inner joint rotates relative to the female joint due to the relative rotation of the female joint, the chamfered portion is scratched or worn powder is generated. Therefore, when the inner joint is reinserted into the female joint, there is no inconvenience of scratching the surface of the O-ring or adhering abrasion powder to the O-ring even if the chamfered portion is rubbed. Therefore, the watertight state between the inner peripheral surface of the female joint and the outer peripheral surface of the inner joint is assured, and the inconvenience of fluid leaking due to damage to the O-ring can be prevented.

Further, in addition to the above effects, by forming the base portion of the annular flange portion in a substantially triangular cross section, the annular flange portion is reinforced from both sides, and the strength is increased. Therefore, even when the outer peripheral flange strongly contacts the annular flange when the inner joint is inserted into the female joint, the annular flange can be prevented from being damaged or deformed.

Furthermore, according to the invention according to claim 2 , in the state where the opposing surfaces of the outer peripheral flange are abutted with each other, an annular space portion having a predetermined shape is formed therebetween, and on the outer side, the opposing surface of the outer peripheral flange is substantially the same. It becomes the aspect which protrudes in a contact state. Since the annular space portion has a shape that opens only inward, when the entire annular collar portion is stored in the annular space portion, it is possible to prevent inconvenience that dust adheres to the annular collar portion or an external impact is applied. Can do.

Explanatory drawing which shows the use condition of the coupling of embodiment of this invention. Sectional drawing which shows the connection state of the coupling of embodiment of this invention. Explanatory drawing of the inner joint of the joint of embodiment of this invention. The partial expanded sectional view which shows the connection state of the coupling of embodiment of this invention. The partial expanded sectional view which shows the connection state of the other example of the coupling of embodiment of this invention. The partial expanded sectional view which shows the connection state of the joint as a reference example . Sectional drawing which shows the connection state of the conventional coupling. The perspective view which shows the metal fitting of the conventional coupling.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 1, the joint according to the embodiment of the present invention is a female joint connected to a pipe (4) in a wall and fixed in a box (43) installed on a wall plate (42). 2 and the female joint (22) connected to the indoor pipe (40) extending from the indoor hot water circulation heating device (41), as shown in FIG. 2, the inner joint (1) and the metal The metal fitting (3) is related to the joint to be connected with the metal fitting (3). The metal metal fitting (3) has a conventional configuration in which an opening (33) is formed with a substantially U-shaped cross section as shown in FIG. It can be adopted.

Outer flanges (23) and (24) project from the connecting ends of the female joints (21) and (22), respectively, and a chamfered portion (25) is provided around the inner peripheral edge.
On the inner peripheral surface of the female joints (21) and (22), an inner joint housing part (26) that can accommodate about half the length of the inner joint (1) is formed following the chamfered part (25). Yes.
The inner joint (1) is a substantially cylindrical body having an outer diameter that can be accommodated in the inner joint housing portion (26). At the center in the longitudinal direction, as shown in FIG. Two concave grooves (12) are formed in the circumferential direction on the left and right outer peripheral surfaces, and an O-ring (10) is fitted in each concave groove (12). .

  As shown in FIG. 4, the base part of the annular flange part (11) is formed in a substantially triangular cross section, and the inclination angles of the slopes (13), (14) on both the left and right sides thereof are female joints (21), (22). ) And the angle of inclination of the chamfered portion (25). When the inclined surfaces (13) and (14) are made to correspond to the chamfered portion (25), the protruding portion of the annular flange (11) is positioned outside the chamfered portion (25) so that the annular flange (11) The outer diameter is set to be larger than the maximum diameter of the tapered portion constituting the chamfered portion (25).

  To connect the pair of female joints (21) and (22) using one inner joint (1), first, connect one end of the inner joint (1) to the female joint (21 on the wall plate (42) side. ) In the inner joint housing part (26). The O-ring (10) is fitted in the concave groove (12) of the inner joint (1), and the outer diameter of the O-ring (10) is set to be slightly larger than the outer diameter of the inner joint (1). However, since the chamfered portion (25) is formed on the open end side of the female joint (21), the O-ring (10) protruding outward from the outer peripheral surface of the inner joint (1) The inner joint (1) is housed smoothly and densely in the inner joint housing part (26) of the female joint (21) while being gradually pressed by the tapered surface of the chamfered part (25).

  The length of the inner joint housing part (26) is set so that about half of the inner joint (1) can be accommodated, and the annular flange (11) projects into the center of the inner joint (1). 3 so that the right half of the inner joint (1) in FIG. 3 can be inserted until the annular flange (11) contacts the tip of the outer peripheral flange (23) of the female joint (21). When it comes into contact with the portion (11), further insertion is blocked. In this inserted state, the gap between the chamfered portion (25) of the female joint (21) and the slope (13) of the base portion of the annular flange (11) of the inner joint (1) is as shown in FIG. The dimensions of each part are set so that the gap (S) is formed.

Next, another female joint (22) is fitted on the other end of the inner joint (1).
The left half of the inner joint (1) is inserted into the inner joint accommodating part (26) of the female joint (22) while deforming the O-ring (10) in the same manner as the right half described above, and the outer flange When the tip of (24) comes into contact with the annular flange (11) of the inner joint (1), further insertion is prevented. When the insertion is completed, a similar gap (S) is formed between the chamfered portion (25) of the female joint (22) and the inclined surface (14) of the base portion of the inner joint (1).

  Incidentally, by forming the base portion of the annular flange portion (11) in a substantially triangular cross section, the annular flange portion (11) is reinforced from both sides of the proximal end portion. Therefore, when the female joints (21) and (22) are externally fitted to the inner joint (1), even if the outer peripheral flanges (23) and (24) strongly contact the annular flange (11), the annular flange (11 ) Can be prevented from being damaged or deformed.

The outer flanges (23) and (24) of the female joints (21) and (22) are connected to each other on the left and right sides of the annular flange (11) of the inner joint (1), and the outer flange (23) in this state The connecting fitting (3) is externally fitted to the butting portion (2) of (24), and the outer peripheral flanges (23) and (24) are fitted into the opening (33) of the connecting fitting (3).
As shown in FIG. 8, the connecting metal fitting (3) is formed by bending an elastically deformable metal plate so that the engagement pieces (35) hang down from both side ends of the top surface (34). A part of the engagement piece (35) is curved in an arc shape along the outer periphery of the inner joint (1) and is abutted via the annular flange (11). An opening (33) having a width in which the pair of outer peripheral flanges (23) and (24) in the state is just fitted is formed.

  By fitting the outer flange (23) (24) into the opening (33) at the same time, the outer flange (23) (24) is engaged with both side edges of the opening (33), and the outer flange (23) (24) Is kept in the separation prevention state. Thus, the pair of female joints (21) and (22) is in a watertight state with the outer peripheral flanges (23) and (24) being in contact with each other through the annular flange (11) and through the inner joint (1). The connection is held in the state.

  After connecting the joint, when the female joint (22) is turned to the left or right during indoor piping (40) side piping construction or maintenance, the female joint (22), the inner joint (1) and the female joint (21 ) Will rotate relatively, but at this time, the chamfered portion (25) of the female joints (21) and (22) and the inclined surface (13) and (14) of the annular flange (11) of the inner joint (1). ), A gap (S) is formed between them, so that they do not contact each other. Therefore, the chamfered part (25) does not get scratched or wear particles due to rubbing against the outer peripheral surface of the inner joint (1), and the female joint (21) (22) and the inner joint (1 ), The surface of the O-ring (10) may be scratched or wear powder may adhere even if the chamfered part (25) is pressed strongly against the surface of the O-ring (10). There is no. Therefore, even if the female joints (21) and (22) are repeatedly attached and detached, the O-ring (10) is not damaged, and the inner joint surface (26) of the female joints (21) and (22) is not damaged. The space is kept in a watertight state and can be used for a long time as a joint connecting the outdoor pipe (4) and the indoor pipe (40).

FIG. 5 is an explanatory view of a modified example of the female joints (21) and (22). On the opposing surfaces (23a) and (24a) of the outer peripheral flanges (23) and (24), the chamfered portion (25) is provided. Subsequently, annular recesses (23b) and (24b) are formed. In this case, when both ends of the inner joint (1) are inserted into the female joints (21) and (22), the opposing surfaces (23a) and (24a) of the outer peripheral flanges (23) and (24) are in direct contact with each other. An annular space portion (S2) surrounded by the chamfered portion (25) and the annular recessed portions (23b) (24b) is formed inwardly. The entire annular flange (11) of the inner joint (1) can be accommodated in the annular space (S2).
When the female joints (21) and (22) are connected, the chamfered portion (25) is set so as not to contact the outer peripheral surface of the inner joint (1), and the annular space portion (S2) is Therefore, the annular flange (11) housed in the annular space (S2) is protected from dust adhesion and damage due to external impact.

[ Reference example ]
FIG. 6 is an explanatory view of a reference example of the inner joint (1), in which the base of the annular flange (11) is not formed in a substantially triangular shape. In this, the strength of the annular flange (11) itself is inferior to that of the base having a substantially triangular cross section, but between the chamfered portion (25) and the outer peripheral surface of the inner joint (1), The space (S) can be provided with certainty.

In the above embodiments, the inner joint (1) with the O-ring (10) can be smoothly fitted into the female joint (21) by providing a chamfered portion (25) at the inner edge of the open end of the female joint (21) (22). It can be inserted into the joint (21) (22), and the tip of the outer flange (23) (24) abuts the annular flange (11) of the inner joint (1) from both sides. 1) is housed in a watertight state in a stable state without slipping or rattling in the female joints (21) and (22).
Further, the chamfered portion (25) of the female joint (21) (22) is connected in a non-contact state to the outer peripheral surface including the slope (13) (14) of the inner joint (1), so that the female joint (21) ( Even if 22) is rotated left and right with respect to the inner joint (1), the chamfered portion (25) and the outer peripheral surface of the inner joint (1) do not rub against each other. Therefore, when removing or reconnecting the female joints (21) and (22), the chamfered part (25) will not be scratched by friction or wear powder will adhere to the O-ring (10). There is no inconvenience of scratches and abrasion powder from the chamfered part (25), and the female joints (21) and (22) can be connected via the inner joint (1) for a long period of time while maintaining a reliable seal. Become.

(1) ...
(10) ... O-ring
(11) ...
(21) (22) ... Female fitting
(23) (24) ・ ・ ・ ・ ・ Outer flange
(25) .... Chamfer
(3) ...
(S) ・ ・ ・ ・ ・ ・ ・ Gap

Claims (2)

A pair of female joints having an outer peripheral flange projecting from one end open part of the hollow cylinder and a chamfered part formed on the inner peripheral edge thereof, and a butted part of the female joint in a state where the outer peripheral flanges are butted together In a joint composed of an inner joint inserted through an O-ring and a coupling fitting that is externally fitted to the butted portion and connects the pair of female joints,
In the center of the outer peripheral surface of the inner joint, a thin annular flange is projected in the circumferential direction,
The outer diameter of the annular flange is set larger than the maximum diameter of the chamfered portion,
The shape of the base of the annular flange is a substantially triangular cross section having slopes along the chamfered part on both sides,
A joint, wherein a gap is formed between the chamfered portion and the inclined surface in a state where the connection fitting is mounted. 2. The joint according to claim 1 , wherein an annular space is provided between the annular recess and the chamfered portion when the opposed surfaces of the outer peripheral flange are provided with an annular recess following the chamfered portion and the opposed surfaces are brought into contact with each other. The joint is characterized in that the whole annular collar portion can be stored in the portion.

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