JP3808870B2 - Tube connection structure - Google Patents

Description

  The present invention relates to a tube connecting structure for connecting a tube to a counterpart tube.

Conventionally, as a pipe connection structure for connecting a pipe body to a counterpart pipe body, for example, a pipe connection structure for connecting a faucet fitting and a pipe, a pipe connection structure as shown in FIG. 14 is generally used. It is used.
In the figure, reference numeral 200 denotes one (for example, the pipe side) pipe body, which has a female screw portion 202 (FIG. (A)) on the inner peripheral side of the tip portion and a male screw portion 204 ((B)) on the outer peripheral side. is doing.

  Reference numeral 206 denotes the other (for example, faucet side) tube body on the other side, and a cap nut 212 (shown in the drawing) having a male screw portion 208 (FIG. (A)) on the outer peripheral side of the tip portion or a female screw portion 210 on the inner peripheral side. (B)) respectively.

  In the case of this conventional connection structure, as shown in (A), the male threaded portion 208 of the tubular body 206 is connected to the female threaded portion 202 of the tubular body 200 by screwing, or as shown in (B). As shown in the figure, the cap nut 212 of the tube body 206 is screwed to the male thread portion 204 of the tube body 200 to connect the pair of tube bodies 200 and 206.

  The seal between the pair of tubes 200 and 206 is performed by winding a seal tape around the male screw portion 208 shown in (A) and screwing them together, or as shown in (B). This is done by swallowing the packing 214 between 200 and 206.

  However, in the case of the connection structure shown in FIG. 14, the construction is complicated such as winding the seal tape or rotating the screw part many times using a tool. There is a problem that variations in construction occur due to winding or screwing.

On the other hand, a connection structure as shown in FIG. 15 has recently been used.
In this connection structure, a pair of tubular bodies can be connected with one touch using a clamp member.
More specifically, in the figure, reference numeral 216 denotes a hollow cylindrical insertion shaft provided projectingly on the tube body 206, and has a male fitting surface 217 having a smooth circular cross section extending in the tube axis direction on the outer peripheral side. ing.

  220 is a female fitting surface having a smooth circular cross section provided in the tube body 200 and extending in the tube axis direction, and 222 and 224 are continuous in the circumferential direction as a hook-shaped portion provided in the tube bodies 200 and 206, respectively. The flange portion 226 is an elastic clip as a clamp member.

  The elastic clip 226 has a configuration in which a belt-shaped metal leaf spring material is bent into a substantially ring shape as shown in FIG. 2C, and has a fitting opening 228 at a predetermined position in the circumferential direction. Moreover, it has the engaging groove 230 extended in the circumferential direction in the width direction intermediate part.

  In the case of this connection structure, the insertion shaft portion 216 is inserted into the tube body 200, the male fitting surface 217 and the female fitting surface 220 are fitted, and the elastic clip 226 is inserted through the fitting opening 228. The pair of flange portions 222 and 224 of the pipe bodies 200 and 206 which are elastically fitted so as to straddle the pipe bodies 200 and 206 and are brought into contact with each other are inserted into the engaging grooves 230 of the elastic clip 226. By doing so, the pair of tube bodies 200 and 206 are connected.

In the case of this connection structure, as shown in the figure, the male fitting surface 217 and the female fitting surface 220 are sealed in a watertight manner by a seal member 218 made of an O-ring or the like attached to the male fitting surface 217. .
Alternatively, a seal member 218 made of an O-ring or the like is attached to the female fitting surface 220, and the male fitting surface 217 and the female fitting surface 220 are sealed in a watertight manner by the seal member 218.
Alternatively, a seal member can be sandwiched between the abutment surface 221 of the tube body 200 and the abutment surface 219 of the tube body 206, thereby making a seal between the pair of tube bodies 200, 206.

  The connection structure shown in FIG. 15 can be used to connect the pipe bodies 200 and 206 very easily with a single touch. In recent years, the connection structure has been increasingly used.

However, at present, the present situation is that the screw connection method shown in FIG. 14 and the fitting connection method of the fitting portion (male fitting surface, female fitting surface) shown in FIG. 15 coexist. When a pair of tubes are to be connected at the site, one tube is of the screw connection method shown in FIG. 14 and the other tube is of the fitting connection method shown in FIG. Can occur.
In this case, both pipes cannot be connected as they are, and therefore it may happen that the pipe connection construction must be interrupted.

The invention of the present application has been made to solve such problems.
Thus, the tubular body connection structure according to claim 1 is a tubular body connection structure in which a male thread portion for screw connection with a counterpart tubular body is provided on one axial end side of the tubular body. A hook-shaped part protruding outward in a direction perpendicular to the axis is provided. The hook-shaped part can be clamped by the counterpart tube body and a clamp member, and the male screw part is provided on the outer peripheral surface of the hook-shaped part. It is characterized by being.

  According to a second aspect of the present invention, in the pipe connecting structure according to the first aspect, the flange-shaped portion is a flange portion that forms an annular shape that is continuous in the circumferential direction.

  The pipe connection structure according to claim 3 is the pipe connection structure according to any one of claims 1 and 2, wherein the pipe has a female fitting surface or male fitting that extends smoothly in the pipe axis direction and is provided in the counterpart pipe. A male fitting surface or a female fitting surface which is inserted and fitted in the tube axis direction with respect to the mating surface is provided.

Effects and effects of the invention

According to claim 1, when the mating tube body is of a screw connection type having a female threaded portion, the female threaded portion is screw-connected to the male threaded portion of the tubular body, so that the pair of tubular bodies can be connected without hindrance. Can be connected.
On the other hand, when the mating tube is of a fitting connection type, the tube and the mating tube can be clamped by the clamp member using the hook-shaped portion of the tube.
In this case, the bowl-shaped portion can be a flange portion having an annular shape that is continuous in the circumferential direction (claim 2).

  Further, the tube body can be provided with a male fitting surface or a female fitting surface that is inserted and fitted in the tube axis direction with respect to the female fitting surface or the male fitting surface of the counterpart tube body ( Claim 3).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1 (A), 10 is an adapter (tube body as a joint) for connecting a pair of tube bodies 12 and 14, has a short tubular shape, and has a male thread portion (connection function) on one end side in the tube axis direction. Part) 16 and a female fitting surface (connection function part) 18.
The female fitting surface 18 has a circular cross-sectional shape and is a surface that extends smoothly in the tube axis direction.

The adapter 10 has an annular groove 20 at the tube axis direction intermediate portion and on the outer peripheral side, and the annular groove 20 serves as an annular flange as a flange-like portion protruding outward in the direction perpendicular to the axis at one end side of the tube axis direction. A portion 22 is formed. The male screw portion 16 is formed on the outer peripheral surface of the flange portion 22.
A male screw part (connection function part) 24 is formed on the other end side in the pipe axis direction of the adapter 10, and this male screw part 24 is screw-connected to the female screw part 26 of the other tube body 14. .

  In the case of the tube connection structure of this example, when one tube body (mating tube body) 12 has a female screw portion 28, the female screw portion 28 can be screw-connected to the male screw portion 16 of the adapter 10. Thus, the pair of tubular bodies 12 and 14 can be connected via the adapter 10.

  One tubular body 12 has an annular flange portion 30 as a bowl-shaped portion, a cylindrical insertion shaft portion 32 protruding in the tube axis direction, and a circular cross section on the outer peripheral side of the insertion shaft portion 32 and smooth in the tube axis direction. The male fitting surface 34 is inserted into the female fitting surface 18 of the adapter 10 and the seal member 36 is formed of an O-ring attached to the male fitting surface 34. In a state of being fitted in a watertight manner, the pair of tubular bodies 12 and 14 can be brought into a connected state via the adapter 10 by retaining them in the tube axis direction by an elastic clip 38 as a clamp member.

The seal member 36 may be mounted on the female fitting surface 18 in advance to seal the male fitting surface 34 and the female fitting surface 18 in a watertight manner, or one of the tubes. A ring-shaped sealing member is swallowed in the tube axis direction by the body 12 and the adapter 10 so that the space between them can be sealed in a watertight manner.
This is the same in the following examples.

The elastic clip 38 has a shape in which a strip-shaped leaf spring material is bent in a substantially ring shape, and has a fitting opening 40 at a predetermined position in the circumferential direction, and avoids interference with the flange portion on the opposite side. An escape portion 44 is formed.
In addition, the engaging groove 42 extends in the circumferential direction at the intermediate portion in the width direction, and a guide portion 46 that is opened in the shape of a letter C is formed following the fitting opening 40.

The elastic clip 38 is elastically fitted so as to straddle the adapter 10 and the one pipe body 12, and the flange portions 22 and 30 of the adapter 10 and the one pipe body 12 are inserted into the engaging groove 42 of the elastic clip 38. The adapter 10 and the one tube body 12 can be prevented from being pulled out in the tube axis direction.
That is, in this example, the retaining means is constituted by the flange portions 22 and 30 and the elastic clip 38 as a clamp member.

FIG. 6B shows an example (comparative example) in which pipes are connected using an adapter 10 of another form. In this example, a female screw part (connection function part) 48 is used instead of the male screw part 16 as an adapter. 10 is provided.
The adapter 10 is provided with a female fitting surface 18, a male screw portion 24, and a flange portion 22 in the same manner as in the above embodiment.

In the case of the example shown in (B), when one tube body 12 has a male threaded portion 50, the male threaded portion 50 is screwed to the female threaded portion 48 of the adapter 10, thereby making a pair of tubular bodies 12, 14 can be connected via the adapter 10.
Further, when one tube body 12 is of a fitting connection type having a male fitting surface 34, an adapter connects one tube body 12 and the other tube body 14 in the same manner as shown in (A) above. 10 can be connected.
That is, also in this example, the common adapter 10 can correspond to two different types of tube bodies 12.

  In the example (comparative example) of FIG. 5C, a cylindrical insertion shaft portion 52 is provided in the adapter 10 in place of the female fitting surface 18 in the above (B), and the outer peripheral side thereof has a circular cross section and in the tube axis direction. This is an example in which a male fitting surface (connection function portion) 54 extending smoothly is provided.

  In the case of this example, when one tube body 12 has a male thread portion 50, the pair of tube bodies 12 and 14 are connected via the adapter 10 by screwing the tube body 12 to the female thread portion 48 of the adapter 10. When one of the pipe bodies 12 has the female fitting surface 56, the female fitting surface 56 is inserted into the male fitting surface 54 of the adapter 10 so that the male fitting surface 54 and the female fitting are inserted. With the mating surface 56 sealed in a water-tight manner via the seal member 36, the adapter 10 and one of the pipe bodies 12 are prevented from being pulled out in the pipe axis direction by the elastic clip 38, whereby the pipe bodies 12 and 14 are connected. It can be in a connected state.

  The sealing material 36 is mounted on the female fitting surface 56 side, and the male fitting surface 54 and the female fitting surface 56 are sealed in a water-tight manner, or the adapter 10 and the tubular body 12 form a ring shape. As described above, it is possible to seal between the sealing members by swallowing them in the tube axis direction.

  The example of FIG. 1D shows still another example, and the tube connecting structure of this example is a cylindrical insertion shaft portion instead of the female fitting surface 18 in the adapter 10 of FIG. 52 is provided on the adapter 10, and a male fitting surface 54 having a circular cross-sectional shape and extending smoothly in the tube axis direction is formed on the outer peripheral side of the insertion shaft portion 52.

  In the case of this example, when one pipe body 12 has a female threaded portion 28, the female threaded portion 28 is screwed to the male threaded portion 16 of the adapter 10 so that the pair of tubular bodies 12, 14 are connected to the adapter 10. Can be connected through.

  When one of the pipe bodies 12 has a female fitting surface 56, the female fitting surface 56 is fitted to the male fitting surface 54 of the adapter 10, and they are connected to the pipe shaft by the elastic clip 38. By retaining in the direction, the pair of pipe bodies 12 and 14 can be connected.

  Each example of FIG. 1 is an example in which the adapter 10 has a male screw portion 24 on the connection side with one tube body 14 and is screwed to the female screw portion 26 of the other tube body 14 at the male screw portion 24. However, as shown in FIG. 2, the adapter 10 is provided with a female screw portion (connection function portion) 58 instead of the male screw portion 24 for connection to the other tube body 14, and the female screw portion 58 is connected to the other screw body 24. A screw connection to the male thread portion 60 of the tube body 14 can also be made.

  2 (A) and (B) in FIG. 2 (comparative example) and (C) and (D) are the same as those in FIG. 1 (A), (B) and (C). , (D), and therefore, only the reference numerals are shown here and further detailed description is omitted.

  Next, in each example of FIG. 3, the adapter 10 is provided with a cylindrical insertion shaft portion 62, and a male fitting surface (connection function portion) 64 having a circular cross section and extending smoothly in the tube axis direction is provided on the outer peripheral side thereof. The male fitting surface 64 is fitted into and contacted with the female fitting surface 66 of the other tube body 14, and the elastic clip 38 serving as a clamp member is used to prevent them from being pulled out in the tube axis direction.

  Specifically, the elastic clip 38 is elastically fitted so as to straddle between the adapter 10 and the other tube body 14, and the flange portion (saddle-like portion) 68 of the adapter 10 and the flange portion (鍔) of the other tube body 14. ) 70 is engaged with the engagement groove 42 of the elastic clip 38 so that the adapter 10 and the other tube body 14 are prevented from being pulled out in the tube axis direction.

  3A and 3D and the examples of FIGS. 3B and 3C (comparative examples) are the same as those in FIGS. 1A, 1D, 1B, Since it is the same as the example of (C), only a code | symbol is shown and further detailed description is abbreviate | omitted.

  3A, 3B, 3D, and 3D, the adapter 10 in the case where the other tube body 14 is of a fitting connection type having a female fitting surface 66. By using, two types of pipe bodies (one pipe body) 12 having different connection function portions can be connected to the other pipe body 14.

  Next, in the example of FIG. 4, the adapter 10 is provided with a female fitting surface (connection function portion) 72, and the female fitting surface 72 is connected to the male fitting surface 76 of the insertion shaft portion 74 of the other tubular body 14. This is an example in which, after being fitted, they are retained in the tube axis direction by an elastic clip 38 as a clamp member.

  4 (A), (D) and (B), (C) (comparative example) are also shown in FIGS. 1A, 1 D, (B), Since it is the same as the example of (C), only a code | symbol is shown and further detailed description is abbreviate | omitted.

  4A, 4 </ b> B, 4 </ b> C, and 4 </ b> D, the adapter 10 is used when the other tube body 14 is of a fitting connection type having a male fitting surface 76. By using, two types of pipe bodies (one pipe body) 12 having different connection function portions can be connected to the other pipe body 14, respectively.

  The above is an example in which a single connection function unit is provided in the adapter 10 for connection to the other tube body 14, but the adapter 10 is connected to the other tube as in the examples shown in FIGS. Two types of connection function units may be provided for connection with the body 14.

Among these, the example of FIG. 5 is an example in which the male screw portion 24 and the female fitting surface (connection function portion) 72 are provided on the other axial end side of the adapter 10, that is, on the connection side with the other tube body 14. It is.
In the case of this example, the common adapter is used both in the case where the other tube body 14 is of the screw connection type having the female thread portion 26 and in the case of the fitting connection type having the male fitting surface 76. 10 can cope.
That is, in the case of the example of FIG.

  In the example of FIG. 5, two types of connection function portions similar to those in FIG. 1A, that is, two types of male screw portion 16 and female fitting surface 18, are used for connection with one tubular body 12 in the adapter 10. 5 as a typical example, the adapter 10 of FIG. 5 is also similar to that of FIGS. 1B, 1C, and 1D for connection to one tube body 12. Two types of connection function units may be provided in combination.

That is, as shown in FIG. 1 (B), the adapter 10 can be provided with a combination of the female thread portion 48 and the female fitting surface 18 for connection to the one pipe body 12, or (C). As described above, the combination of the female screw portion 48 and the male fitting surface 54 can be used.
Alternatively, a combination of the male screw portion 16 and the male fitting surface 54 can be provided as in the example of FIG.
This also applies to the following examples shown in FIGS.

  The example of FIG. 6 includes a male screw portion 24 and an insertion shaft portion 62, that is, a male fitting surface 64 on the other end side in the tube axis direction of the adapter 10 for connection to the other tube body 14. In the case of the tubular body connection structure of this example, when the other tubular body 14 is of the screw connection type having the female screw portion 26, the female screw portion 26 is screw-connected to the male screw portion 24 of the adapter 10, so that a pair of Tubes 12 and 14 can be connected.

  Further, when the other tube body 14 has a flange portion 70 as a hook-like portion for clamping by the female fitting surface 66 and the elastic clip 38, the male fitting surface 64 of the adapter 10 is connected to the other tube body 14. In this state, the elastic clip 38 is fitted over the female fitting surface 66, and the pair of flanges 68 and 70 are engaged with the engaging groove 42 of the elastic clip 38 to prevent it from being removed. Thus, the pair of tube bodies 12 and 14 can be connected via the adapter 10.

  The example of FIG. 7 (comparative example) is an example in which an internal thread portion 58 and a male fitting surface 64 are provided in the adapter 10 for connection to the other tube body 14. In this example, the other tube body is provided. When 14 is a screw connection type having a male threaded portion 60, the male threaded portion 60 is screwed to the female threaded portion 58 of the adapter 10, thereby connecting one tubular body 12 and the other tubular body 14. Can do.

  When the other tube body 14 is of a fitting connection type having a female fitting surface 66, the male fitting surface 64 of the adapter 10 is fitted and connected to the female fitting surface 66 of the other tube body 14, In this state, the elastic clip 38 is fitted so as to straddle them, the pair of flanges 68 and 70 are engaged with the engagement groove 42 of the elastic clip 38, and the pair of tube bodies 12 and 14 are connected by retaining. can do.

  Next, the example of FIG. 8 (comparative example) is an example in which the adapter 10 is provided with the female screw portion 58 and the female fitting surface 72 for connection to the other pipe body 14. In this case, when the other tube body 14 is of a screw connection type having the male screw portion 60, the pair of tube bodies 12 and 14 can be connected by screwing the male screw portion 60 into the female screw portion 58 of the adapter 10. it can.

  When the other tube body 14 is of a fitting connection type having a male fitting surface 76, the male fitting surface 76 is fitted and connected to the female fitting surface 72 of the adapter 10, and the elastic body is elastic in that state. By fitting the clip 38 across them, the pair of tubular bodies 12 and 14 can be connected.

FIG. 9 shows another embodiment of the present invention.
In FIG. 1A, the adapter 10 has a male threaded portion 86 at one end in the tube axis direction, a flange 88 at the other end, a male threaded portion 90 of the same type as the male threaded portion 86 on its outer peripheral surface, and an insertion shaft portion. 92 and a male fitting surface 94 on the outer peripheral surface thereof.
In the case of this example, in a state where the adapter 10 is screw-connected to the female screw portion 26 of the other tube body 14 at the male screw portion 90, the female screw portion 28 of one tube body 12 is screwed into the other male screw portion 86. Tube bodies 12 and 14 can be connected.

  On the other hand, the adapter 10 is removed from the other tube body 14 so that its orientation is reversed by 180 ° in the tube axis direction, and the male thread portion 86 is screwed to the female thread portion 26 of the other tube body 14, thereby Even when the tubular body 12 is of a fitting connection type having the female fitting surface 56, it can be connected to the other tubular body 14.

  Specifically, as shown in FIG. 5B, the female fitting of one tubular body 12 is performed on the male fitting surface 94 of the adapter 10 which is opposite to the state shown in FIG. The mating surface 56 is inserted and they are fitted and connected, and in this state, the elastic clip 38 is fitted so as to straddle the adapter 10 and the one pipe body 12, and the flange portions 88 and 30 are inserted into the engaging grooves of the elastic clip 38. The pair of tubular bodies 12 and 14 can be connected by engaging with 42 to prevent the removal.

In FIG. 9A, the adapter 10 is fitted by fitting the male fitting surface 94 of the adapter 10 to the female fitting surface 66 of the other tube body 14 and screwing the male screw portion 90 and the female screw portion 26 together. And the other tube body 14 are prevented from being removed.
That is, in this example, the male screw portion 90 and the female screw portion 26 constitute a retaining means.

  In this example, two types of connection function portions of the adapter 10, that is, two types of connection function portions of the male screw portion 90 and the male fitting surface 94 are simultaneously corresponding two types of connection function portions of the other tubular body 14, that is, Although it is connected to the female screw part 26 and the female fitting surface 66, the screwed part between the male screw part 90 and the female screw part 26 is sealed in a watertight manner, or the adapter 10 and the other tube body 14 are ring-shaped. By inserting and sealing the seal member in the tube axis direction, the male fitting surface 94 can be loosely fitted to the female fitting surface 66.

That is, the adapter 10 can be screw-connected to the female screw portion 60 of the other tube body 14 only at the male screw portion 90.
Therefore, it is not always necessary to fit the male fitting surface 94 of the adapter 10 to the female fitting surface 66 of the tube body 14 in a watertight manner.

The example of FIG. 10 (comparative example) shows a modification of the example of FIG.
In this example, the adapter 10 does not include the male screw portion 90, the adapter 10 is fitted to the female fitting surface 66 at the male fitting surface 94 with respect to the other tube body 14, and the elastic clip 38 is used. The flange portions 104 and 70 are prevented from being pulled out in the tube axis direction.

Also in this case, the pair of tubular bodies 12 and 14 can be connected by screwing the female threaded portion 28 of one tubular body 12 to the male threaded portion 86 as shown in FIG.
On the other hand, the male threaded portion 86 is screwed to the female threaded portion 26 of the other tubular body 14 with the adapter 10 reversed as shown in FIG. By securing the tubular body 12, one tubular body 12 having the female fitting surface 56 can be fitted and connected to the adapter 10. That is, one tubular body 12 having the female fitting surface 56 can be connected to the other tubular body 14 via the adapter 10.

  In the example of FIG. 11 (comparative example), the female screw portion 96, the female fitting surface 98, and the flange portion 100 are provided on the other end side in the tube axis direction of the adapter 10, and the female screw portion 102 of the same type as the female screw portion 96 is provided on one end side. In the case of this example, as shown in (B), the female threaded portion 102 is screw-connected to the male threaded portion 60 of the other tubular body 14, and the male fitting of one tubular body 12 in this state is performed. The mating surface 34 is fitted and connected to the female fitting surface 98 of the adapter 10 and is secured by the elastic clip 38, whereby the pair of tubular bodies 12 and 14 can be connected.

On the other hand, as shown in (A), the adapter 10 is pulled out from the other tube body 14 so that the direction is reversed, and the female screw portion 96 is screwed to the male screw portion 60 of the other tube body 14. The pair of tubular bodies 12 and 14 can be connected by screwing the male threaded portion 50 of one tubular body 12 to the female threaded portion 102 that is in the opposite direction.
That is, also in this example, by using the common adapter 10 and reversing the direction, it is possible to connect one tube body 12 of a different type to the other tube body 14.

FIG. 12 shows still another example (comparative example).
The adapter 10 of this example includes a male screw portion 96 and a flange portion 88 on the other end side in the tube axis direction, an insertion shaft portion 92 and a male fitting surface 94 on the outer peripheral surface thereof, and a female screw of the same type as the female screw portion 96 on one end side. Part 102 is provided.

  In the case of this example, as shown in FIG. 5B, the adapter 10 is screwed to the male threaded portion 60 of the other tubular body 14 at the female threaded portion 102, and one tube having the female fitting surface 56 in that state. The body 12 can be connected to the other tube 14 via the adapter 10.

  Specifically, in a state in which the male fitting surface 94 of the adapter 10 is fitted and connected to the female fitting surface 56 of the one tubular body 12, the flange portion 88 of the adapter 10 and the flange portion of the one tubular body 12 by the elastic clip 38. The tube bodies 12 and 14 can be connected by swallowing 30 in the axial direction.

  On the other hand, when one tubular body 12 has a male threaded portion 50 as shown in FIG. 5A, the adapter 10 is removed from the other tubular body 14 and the direction is reversed. Even when the tubular body 12 has the male screw portion 50, the tubular body 12 and the other tubular body 14 can be connected.

FIG. 13 shows still another example.
The adapter 10 of this example includes a flange portion 88 on the other end side in the tube axis direction, a male screw portion 86 and a female fitting surface 106 on the outer peripheral surface thereof, and a male screw portion 90 of the same type as the male screw portion 86 on one end side. I have.

  In the case of the tubular body connection structure of this example, when one tubular body 12 is of a fitting connection system having a male fitting surface 34 as shown in FIG. 1, the male fitting surface 34 of one tube 12 is fitted and connected to the female fitting surface 106, and the elastic clip 38 is used to connect the adapter 10 to the female screw portion 26 of the other tube 14. A pair of tubular bodies 12 and 14 can be connected by retaining one tubular body 12.

On the other hand, as shown in (A), when one tube body 12 is of the screw connection type having the female thread portion 28, the adapter 10 is detached from the other tube body 14 and the direction is reversed. The male screw portion 86 is screw-connected to the female screw portion 26 of the other tube body 14.
The pair of tubular bodies 12 and 14 can be connected by screwing the female threaded portion 28 of one tubular body 12 to the male threaded portion 90.

  Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention can be configured in various forms without departing from the gist thereof.

It is a figure which shows the tube connection structure of embodiment of this invention combined with the comparative example. It is a figure which shows the tube connection structure of other embodiment of this invention combined with the comparative example. It is a figure which shows the tube connection structure of other embodiment of this invention combined with the comparative example. It is a figure which shows the tube connection structure of other embodiment of this invention combined with the comparative example. It is a figure which shows the pipe body connection structure of other embodiment of this invention. It is a figure which shows the pipe body connection structure of other embodiment of this invention. It is a figure which shows the pipe connection structure of another comparative example. It is a figure showing the tube connection structure of other comparative examples. It is a figure which shows the pipe body connection structure of other embodiment of this invention. It is a figure showing the tube connection structure of other comparative examples. It is a figure showing the tube connection structure of other comparative examples. It is a figure showing the tube connection structure of other comparative examples. It is a figure which shows the pipe body connection structure of other embodiment of this invention. It is a figure which shows the example of the conventional tube connection structure. It is a figure which shows the example different from FIG. 14 of the conventional pipe connection structure.

Explanation of symbols

10 Adapter (Tube)
12 Tube (mother tube)
16, 86, 90 Male thread portion 18, 106 Female fitting surface 22, 88 Flange portion (saddle-shaped portion)
34 Male mating surface 38 Elastic clip (clamp member)
54, 94 Male mating surface 56 Female mating surface

Claims (3)

In the tube connection structure in which a male thread portion for screw connection with the other tube is provided on one axial end of the tube,
The tubular body is provided with a hook-like portion that protrudes outward in a direction perpendicular to the tube axis. The hook-like portion can be clamped by the counterpart tube body and a clamp member, and the outer periphery of the hook-like portion. A tube connecting structure characterized in that the male screw portion is provided on a surface.   2. The tubular body connection structure according to claim 1, wherein the flange-shaped portion is a flange portion having an annular shape that is continuous in a circumferential direction.   3. The tube body according to claim 1, wherein the tube body extends smoothly in the tube axis direction and is inserted in the tube axis direction with respect to a female fitting surface or a male fitting surface provided in the counterpart tube body. A tube connection structure characterized in that a male fitting surface or a female fitting surface is provided.

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