JP3032308U - Copper pipe fittings - Google Patents

Abstract

(57) [Abstract] [Problem] Without impairing the sealing action with the joint body side,
(EN) Provided is a copper pipe joint capable of easily and surely sealing and fixing a copper pipe. SOLUTION: When the cap nut 30 is screwed into the cap nut screw part 15 of the joint body 10 from the copper pipe 5 side, the taper part 37 of the cap nut 30 contacts the outer peripheral surface of the caulking part 20, and the caulking is performed. The pressing force of the portion 20 toward the shaft center is received. Since the notch 23 is provided in the caulking portion 20 and divided into four pieces, the caulking portion 20 divided into four pieces by the pressing force of the caulking portion 20 toward the axial center side is formed by each piece. Move toward the shaft center so that the inner diameter is smaller than the original inner diameter. Therefore, the caulking portion 20 is in close contact with the outer periphery of the copper pipe 5 such that the annular convex portions 21 and 22 provided on the inner peripheral side bite into the copper pipe 5 and the space between the divided pieces formed by the notch 23. The predetermined gaps are brought into close contact with each other to complete the sealed state.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 With the present invention, with the end of the copper pipe fitted in the joint body, a cap nut is screwed from the copper pipe side to the threaded portion provided on the outer peripheral surface of the joint body to connect the copper pipe and the joint body. Related to copper pipe joints to be connected.

[0002]

[Prior art]

 Conventionally, various types of pipe joints have been proposed. For example, Japanese Patent Application Laid-Open No. 1-203788 discloses a structure for connecting a resin pipe to a joint body. With this structure, as shown in FIG. 4, with the end portion 102 of the resin pipe 101 fitted in the joint body 103, the screw portion 104 provided on the outer peripheral surface of the joint body 103 is connected to the resin pipe 101 side. When the resin pipe 101 and the joint main body 103 are connected to each other by screwing the cap nut 105 from the end, the end face 103a of the joint main body 103 and the inner wall surface of the cap nut 105 are fitted to the outer periphery of the resin pipe 101. The seal ring 107 is interposed between the seal ring 107 and 105a.

The cross section of the seal ring 107 in this case is formed in a substantially triangular shape projecting to the outer peripheral side as shown in FIG. 4, and is fitted to the outer periphery of the resin pipe 101 so that the cap nut 105 is screwed. Then, the tapered portion 109 located on the end surface 103a side of the joint body 103 abuts on the end surface 103a of the joint body 103, while the tapered portion 111 on the inner wall surface 105a side of the cap nut 105 is the inner wall surface of the cap nut. It comes into contact with 105a. When the cap nut 105 is further screwed, opposing pressing forces are exerted from the abutting joint body end face 103a and the cap nut inner wall surface 105a, so that the pushing force causes the tapered portion 109 on the joint body end face 103a side to The end surface 103a is brought into contact with and sealed.

[0004]

[Problems to be solved by the device]

 However, this connection structure has the following problems. First, at least three parts, the joint body 103, the cap nut 105, and the seal ring 107, are required as the components that make up the joint. However, considering the situation where work is often performed in relatively narrow or dark places, the number of parts is The smaller the better. In particular, the seal ring 107 is a separate body, so it is easy to remove. In addition, the seal ring 107 may be asymmetrical due to the difference in the functions of the tapered portions 109 and 111, but in that case, if the right and left are assembled in reverse, a sufficient seal cannot be obtained. . Furthermore, if the seal ring 107 is assembled in a tilted state even if it is in the correct direction, the resin pipe 101 will fall out of the joint body 103 when the seal ring 107 is no longer tilted. It is likely to This is even more the case when the connection target is not the resin pipe 101 but a copper pipe. On the other hand, when the seal ring 107 is a separate body, if the tightening is performed during caulking, the seal ring 107 itself will rotate, and the pipe to be connected (resin pipe 101 in Fig. 4) will also rotate together. The so-called “co-rotation” phenomenon occurs, and the pipe itself may be twisted. The fixing by the seal ring 107 is performed by tightening the cap nut 105 so that the inner wall surface 105a of the cap nut abuts the taper portion 111 on the inner wall surface 105a side of the cap nut, and the inner diameter of the taper portion 111 is reduced. However, the deformation does not occur easily, and sufficient deformation is not likely to occur for the fixing action. In particular, if the connection target is a copper pipe, it is difficult to achieve a reliable connection unless it is tightened with a considerable force.

Therefore, the present invention solves the above-mentioned problems, and a copper pipe joint that can easily and reliably perform the sealing action and the fixing with the copper pipe without impairing the sealing action with the joint body side. The purpose is to provide.

[0006]

[Means for Solving the Problems and Effects of the Invention]

 The copper pipe joint of the present invention made in order to achieve this object is such that the end portion of the copper pipe is fitted into the joint body, and the copper pipe side is attached to the threaded portion provided on the outer peripheral surface of the joint body. In the copper pipe joint that connects the copper pipe and the joint body by screwing a cap nut from the pipe pipe, the pipe pipe is continuous with the threaded portion and has a substantially tapered shape and a tapered shape. The caulking portion that can be fitted to the outer circumference of the end portion is provided, and further, the caulking portion is provided with a notch that divides the caulking portion into two or more pieces from the tip portion to the screw portion side, and the bag The caulking portion, which is divided into two or more pieces, is brought into close contact with the outer periphery of the copper pipe by a pressing force when the nut is screwed into the threaded portion, and a predetermined sealing state is completed. It is characterized by

According to the copper pipe joint of the present invention, the end of the copper pipe is fitted into the caulking portion continuously provided to the screw portion of the joint body, and the cap nut is screwed into the screw portion from the copper pipe side. , The copper pipe and the joint body are connected. However, the caulking part has a notch from the tip part to the screw part side. Therefore, depending on the pressing force when screwing the cap nut into the screw part, 2 pieces The caulked portion divided as described above comes into close contact with the outer periphery of the copper pipe, and the predetermined gaps due to the cuts also come into close contact with each other to complete a predetermined sealed state. In this case, the “predetermined gap due to the notch” does not have to be the entire gap formed by the notch, and it is sufficient that the gaps at the portions necessary for achieving the sealed state are close to each other.

As described above, in the copper pipe joint of the present invention, since the joint body has the crimped portion, the joint body and the cap nut can be constituted by two points. This is preferable from the viewpoint of improving workability in situations where work is often performed in a relatively narrow place or a dark place, and since the seal ring is not a separate body as in the conventional case, it cannot be eliminated.

Further, in the case where the seal ring is a separate body as in the conventional case, if the tightening is performed during caulking, the seal ring itself rotates, and the pipe to be connected also rotates together. The phenomenon of "co-rotation" could occur and the pipe itself could be twisted. However, in the copper pipe joint of the present invention, the caulking part, which is equivalent to the conventional seal ring, is integral with the joint body. There is no “surrounding”, and the copper tube is not twisted.

Further, in the case where the seal ring is a separate body, as described above, when the left and right are not symmetrical, if the left and right are assembled reversely, a sufficient seal cannot be obtained, or even in the correct direction. As a result, if the seal ring is installed in a tilted state, there is a possibility that the copper pipe may drop off from the joint body when the tilt of the seal ring is eliminated. In the present invention, such an inconvenience does not occur.

On the other hand, since the caulking portion has a substantially cylindrical shape and a tapering taper shape, when the cap nut is screwed, the pressing force on the screw portion side and the pressing force on the shaft center side of the caulking portion are simultaneously obtained. You will receive it. Since the caulking part has a notch that divides into two or more pieces from the tip to the screw side, the above-mentioned pressing force on the caulking part shaft center side causes the caulking part to divide into pieces. The formed inner diameter becomes smaller than the original inner diameter, and it is possible to firmly press the copper tube from the surroundings. This facilitates and ensures sealing and fixing with the copper pipe. In this case, the presence of the notch allows caulking work with a relatively weak tightening torque, which is also advantageous in terms of workability.

Further, in addition to the structure of the copper pipe joint, as described in claim 2, the joint body is provided with a collar portion standing at a predetermined position opposite to the caulking portion with a screw portion interposed therebetween. If the cap nut is screwed into the threaded part to complete the specified sealing condition, the cap nut and the flange part come into close contact with each other and the further movement is restricted. It is also possible to adopt a configuration that is set in such a position.

In this case, when the cap nut is screwed into the threaded portion and comes into close contact with the flange portion and can no longer be tightened, an ideal seal completed state is always obtained. Therefore, for example, in the past, only a skilled worker could obtain the desired seal completed state, but with such a configuration, anyone can easily realize the desired seal completed state.

Further, as set forth in claim 3, a configuration is adopted in which an annular convex portion formed in an annular shape along the circumferential direction is provided on the inner periphery of the caulking portion at a predetermined distance inward from the tip portion. It is also possible to do it. This is because it is easier to bite into the copper pipe when contacting at a point (or line) than when contacting at a surface. Moreover, since the annular convex portion is formed in an annular shape along the circumferential direction, it does not hinder the closeness or the sealing degree.

Further, as described in claim 4, a plurality of annular convex portions on the inner circumference of the caulking portion are provided so as to be different in distance from the tip portion, and the inner diameters of the plural annular convex portions are provided outside the copper pipe. It may be possible to set the diameter larger than the diameter by a predetermined amount. In this case, it is also preferable in terms of guiding the copper pipe. That is, when the copper pipe is fitted into the caulked portion, the copper pipe is guided without tilting due to the plurality of annular convex portions, which is also preferable in terms of improving work efficiency.

[0016] In order to obtain the sealed state more reliably, for example, interposing an O-ring or the like to form a double seal structure can be appropriately adopted as a conventional technique for pipe joints.

[0017]

[Embodiment of device]

 Next, an embodiment of the present invention will be described. 1 is a partial cross-sectional perspective view of a copper pipe joint according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a joint body which is one of the constituent elements of the copper pipe joint, and FIG. 3 is a copper pipe joint. FIG. 3 is a cross-sectional view showing a state before and after assembling when connecting to a copper pipe.

As shown in FIG. 1, the present copper pipe joint 1 is for connecting to a copper pipe 5, and is composed of two components, a joint body 10 and a cap nut 30. First, the joint body 10 will be described. The joint body 10 is made of BC6C, for example, and includes a taper screw portion 11, a collar portion 13, a cap nut screw portion 15, and a crimp portion 20. These are continuously provided in this order from one end side to the other end side (tapered screw portion 11 → collar portion 13 → cap nut screw portion 15 → crimped portion 20). A fluid passage 12 is formed inside the joint body 10 along the axis of the joint body 10.

The taper screw portion 11 is for connecting to another pipe or the like (not shown). Further, the collar portion 13 has a substantially hexagonal outer circumference so that it can be used for spanners. The cap nut screw portion 15 is provided on the opposite side of the taper screw portion 11 with the flange portion 13 interposed therebetween, and is for screwing the cap nut 30.

On the other hand, for example, as shown in FIG. 3, the caulking portion 20 is formed by screwing a cap nut 30 into the cap nut screw portion 15 from the copper pipe 5 side in a state where the copper pipe 5 is fitted into the caulking portion 20. By doing so, when the copper pipe 5 and the joint body 10 are connected, the copper pipe 5 is brought into close contact with and fixed to the outer periphery of the copper pipe 5.

The caulking portion 20 has a substantially tubular shape, and is formed in a tapered shape (outer shape) from the connecting portion 20b continuously provided to the cap nut screw portion 15 to the tip portion 20a. . As shown in FIG. 2 (B), in the crimped portion 20, the inner diameter φ1 of the continuous portion 20b is the smallest, and the inner diameter is set to just fit the copper tube 5.

Further, on the inner circumference of the caulking portion 20, there are provided annular convex portions 21 and 22 formed in an annular shape along the circumferential direction at a predetermined distance inward from the tip portion 20a. In this embodiment, two first annular protrusions 21 and second annular protrusions 22 having different distances from the tip portion 20a are provided. As shown in FIG. 2 (B), the first annular convex portion 21 and the second annular convex portion 22 have an inner diameter φ2 slightly larger than the inner diameter φ1 of the continuous portion 20b described above, and have a diameter of φ2. It is made larger than the outer diameter by a predetermined amount.

Further, the caulking portion 20 is provided with four notches 23 extending from the tip portion 20a to the screw portion 15 for the cap nut, and the caulking portion 20 is divided into four pieces. In addition, in the notch 23 of the present embodiment, it is provided from the tip portion 20a to the front of the continuous portion 20b (see FIG. 2 and the like).

On the other hand, on the inner side of the connecting portion 20b, that is, on the inner peripheral side of the portion where the cap nut screw portion 15 is provided on the outer peripheral side, the same inner diameter φ1 as that of the connecting portion 20b (see FIG. ) See). Further, on the inner side, that is, on the inner peripheral side of the portion where the flange portion 13 is provided on the outer peripheral side, the inner diameter is made smaller than the inner diameter φ1 of the continuous portion 20b, as shown in FIGS. As described above, the step portion becomes the stopper portion 14. Further, an O-ring storage groove 17 is also provided on the inner peripheral side of the portion where the cap nut screw portion 15 is provided on the outer peripheral side, and as shown in FIGS. Will be installed.

Next, the cap nut 30 will be described. The cap nut 30 is made of, for example, C3604BD as a material, and is provided with a rotation operation portion 31, a female screw portion 33, a flange 35, a taper portion 37, and a rear end opening portion 39. The rotating operation portion 31 is provided on the outer periphery of the cap nut 30 and has a hexagonal nut shape. The female screw portion 33 is formed on the inner circumference of the cap nut 30 from the front end portion 30 a to the rear end portion 30 b side and is screwed to the cap nut screw portion 15 of the joint body 10.

The flange 35 is provided on the rear end portion 30 b side of the cap nut 30, and a taper portion 37 is formed on the inner periphery thereof. Then, a rear end opening 39 that is continuous with the tapered portion 37 and opens to the rear end 30b is formed. This rear end opening 39 is larger than the outer diameter of the copper tube 5 because it is necessary to pass the copper tube 5, but the outer diameter φ3 of the tip portion 20a of the caulking portion 20 of the joint body 10 (see FIG. ) See) smaller than.

Next, a work procedure for connecting the copper pipe joint 1 described above to the copper pipe 5 will be described. First, the end portion 6 of the copper pipe 5 is fitted into the caulking portion 20 of the joint body 10. As described above, the caulking portion 20 is provided with the annular convex portions 21 and 22 on the inner circumference thereof, and the inner diameters φ2 (see FIG. 2 (B)) of these are larger than the outer diameter of the copper pipe 5 by a predetermined amount. Is only made bigger. Since there are two annular projections 21 and 22 having the same diameter as described above, when the copper pipe 5 is fitted into the caulking portion 20, the copper pipe 5 is prevented from inclining and guided appropriately. This is also preferable from the viewpoint of improving work efficiency. The copper tube 5 thus guided by the annular projections 21 and 22 is fitted further inward through the continuous portion 20b, and when the tip of the copper tube 5 abuts the stopper portion 14, the copper pipe 5 moves further. Will be regulated.

Subsequently, as shown in FIG. 3A, the cap nut 30 is screwed into the cap nut screw portion 15 of the joint body 10 from the copper pipe 5 side. Then, the taper portion 37 of the cap nut 30 comes into contact with the outer peripheral surface of the caulking portion 20, and receives the pressing force of the caulking portion 20 toward the shaft center side. Since the caulking portion 20 is provided with a notch 23 (see FIGS. 1 and 2) and is divided into four pieces, the caulking portion 20 divided into four pieces is pressed by the pressing force of the caulking portion 20 toward the shaft center. , Move toward the shaft center so that the inner diameter formed by each piece is smaller than the original inner diameter.

Therefore, as shown in FIG. 3B, the caulking portion 20 comes into close contact with the outer periphery of the copper pipe 5 so that the annular convex portions 21 and 22 provided on the inner peripheral side bite into the copper pipe 5. At the same time, the predetermined gaps between the divided pieces formed by the notches 23 are brought into close contact with each other to complete the sealed state. In this case, the "predetermined gap between the divided pieces" does not have to be the entire gap formed by the notch 23, and if the gaps of the portions necessary for achieving the sealed state are in close contact with each other. Good.

In the present embodiment, as shown in FIG. 3 (B), the rear end opening 39 of the cap nut 30 is formed of the first annular convex portion 21 and the second annular convex portion 22 of the caulking portion 20. It is set so that a predetermined sealing state is completed when it comes to a position where the space is pressed, and in fact, the tip portion 20a of the caulking portion 20 projects from the rear end portion 30b side of the cap nut 30. Therefore, the tip portion 20a of the crimped portion 20, which corresponds to the tip of each divided piece, spreads like a trumpet, and also functions to prevent the cap nut 30 from loosening.

As a matter of course, the first annular protrusion 21 and the second annular protrusion 22 are in close contact with the copper pipe 5, respectively, so that a reliable sealing state is achieved. Further, when the seal is completed as shown in FIG. 3 (b), the front end portion 30a of the bag nut 30 contacts the flange portion 13 of the joint body 10. To do this, the position of the cap nut 30 in the completed seal state may be tested in advance, and the positional relationship between the front end portion 30a and the flange portion 13 may be set in correspondence with the position.

According to the copper pipe joint 1 of the present embodiment described above, the following effects can be obtained. Since the joint body 10 has the crimped portion 20, the copper pipe joint 1 can be configured with two points of the joint body 10 and the cap nut 30. This is preferable in terms of workability improvement in situations where work is often performed in relatively narrow places or dark places, and since the seal ring is not a separate body as in the past, it will be lost. Possibility is low.

When the seal ring is a separate body as in the conventional case, the seal ring itself rotates during the tightening operation, and the pipe to be connected also rotates together. The phenomenon of "surrounding" may occur and the pipe itself may be twisted. However, in the present copper pipe joint 1, since the caulking portion 20 corresponding to the conventional seal ring is formed integrally with the joint body 10. , "Co-rotation" does not occur, and the disadvantage that the copper tube 5 is twisted does not occur.

Further, in the case where the seal ring is a separate body as in the conventional case, when the left and right are not symmetrical, if the left and right are assembled in reverse, a sufficient seal cannot be obtained, or even in the correct direction. However, if the seal ring is installed while tilted, there is a possibility that the copper pipe may drop off from the joint body when the seal ring tilt is eliminated. The copper pipe joint 1 does not cause such inconvenience.

When the cap nut 30 is screwed into the cap nut screw portion 15 of the joint body 10 and the front end portion 30a of the cap nut 30 comes into contact with the flange portion 13 and the tightening is no longer possible. Therefore, you can always get the ideal finished seal. Therefore, for example, in the past, a desired seal completed state could be obtained only by a skilled worker, but with such a configuration, a desired seal completed state can be easily realized by anyone.

Further, the caulking portion 20 is closely contacted with the copper pipe 5 by the annular convex portions 21 and 22, but this is easier to bite into the copper pipe when abutting at a point than when abutting at a surface. Is taken into consideration. Further, since the annular projections 21 and 22 are formed in an annular shape along the circumferential direction, the closeness or the sealing degree is not hindered. In addition, in the present embodiment, since the two annular convex portions 21 and 22 having the same diameter are provided, it is possible to prevent the copper pipe 5 from tilting when the copper pipe 5 is fitted into the caulking portion 20, which is preferable. It is possible to provide guidance, which is preferable in terms of improving work efficiency.

In this embodiment, since the O-ring 19 is interposed, a double seal structure is provided, and the sealed state can be made more reliable. As described above, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist of the present invention.

For example, in the above-described embodiment, the caulking portion 20 is provided with the four notches 23 and divided into four pieces, but the number is not limited to four and may be divided into two or more pieces. Further, two annular convex portions 21 and 22 on the inner circumference of the caulking portion 20 are provided, but one may be provided as long as it does not need to have the above-mentioned guiding function. On the contrary, three or more may be provided, but the two shown in the above-described embodiments are sufficient to exert a predetermined guiding function.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view of a copper pipe joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a joint body that is one of the constituent elements of a copper pipe joint.

FIG. 3 is a cross-sectional view showing a state from before assembling to after assembling when connecting the copper pipe joint to the copper pipe.

FIG. 4 is a partial cross-sectional view showing a connection structure using a conventional seal ring.

[Explanation of symbols]

1 ... Copper pipe joint 5 ... Copper pipe 6 ... End portion 10 ... Joint body 11 ... Tapered screw portion 12 ... Fluid passage 13 ... Collar portion 14 ... Stopper portion 15 ... Cap nut screw portion 17 ... O-ring storage groove 19 ... O-ring 20 ... Caulking portion 20a ... Tip portion 20b ... Continuous portion 21 ... First annular convex portion 22 ... Second annular convex portion 23 ... Notch 30 ... Cap nut 30a ... Front end portion 30b ... Rear end portion 31 ... Rotation operation Part 33 ... Female screw part 35 ... Flange 37 ... Tapered part 39 ... Rear end opening

Claims (4)

[Scope of utility model registration request] 1. The copper pipe by screwing a cap nut from the copper pipe side to a threaded portion provided on the outer peripheral surface of the joint body with the end portion of the copper pipe fitted in the joint body. A copper pipe joint connecting the joint body with the joint body, wherein the joint portion is provided continuously with the threaded portion, has a substantially tubular shape and a tapered shape, and includes a caulking portion that can be fitted to the outer periphery of the copper pipe end portion. Further, the caulking portion is provided with a notch that divides the caulking portion into two or more pieces from the tip end portion to the screw portion side, and the pressing force when screwing the cap nut into the screw portion is provided. The caulked portion divided into two or more pieces is configured to come into close contact with the outer circumference of the copper pipe, and the predetermined gaps due to the cuts are also brought into close contact with each other to complete a predetermined sealed state. And copper pipe fittings. 2. The joint body is provided with a collar portion standing upright at a predetermined position on the opposite side of the caulking portion with the screw portion interposed therebetween, and the predetermined position where the collar portion stands upright is the screw portion. When the predetermined sealed state is completed by screwing the cap nut onto the portion, the cap nut is set in a position so that the cap nut comes into contact with the flange portion and restricts further movement. The copper pipe joint according to claim 1. 3. The annular convex portion, which is formed annularly along the circumferential direction at a predetermined distance inward from the tip portion, is provided on the inner circumference of the caulked portion. The copper pipe joint according to item 2. 4. The plurality of annular convex portions on the inner circumference of the caulked portion are provided so that the distance from the tip portion is different, and the inner diameters of the plurality of annular convex portions are greater than the outer diameter of the copper pipe. The copper pipe joint according to claim 3, wherein the joint is set large by a fixed amount.