JP2000074274A - Pipe body connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a pair of pipe bodies without trouble in connecting a pair of pipe bodies to each other, even if one pipe body is of a screw connecting type or of an inserting fitting connecting type. SOLUTION: In connecting a pair of pipe bodies 12, 14 to each other, an adapter 10 of a short pipe shape, having an external tread part 16 or an internal thread part 48 for connection to one pipe body 12 and an internal fitting surface 18 and an external fitting surface 54 on one end side in the pipe axial direction, and an external thread part 24 for connection to the pipe body 14 on the other end side is used, and a pair of pipe bodies 12, 14 are connected to each other through the adapter 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe connection structure for connecting a pair of pipes, and more particularly, to a pipe connection structure using an adapter.

[0002]

2. Description of the Related Art Conventionally, as a pipe connecting structure for connecting a pair of pipes, for example, as a pipe connecting structure for connecting a faucet fitting and a pipe, a pipe connecting structure as shown in FIG. Is generally used. In the figure, reference numeral 200 denotes one of the pipes (for example, on the pipe side), which has a female thread portion 202 (FIG. 1A) on the inner peripheral side at the distal end or a male thread portion 204 (FIG. are doing.

Reference numeral 206 denotes the other (for example, on the faucet side) tube, which is a cap nut 212 (see FIG. 3A) having a male thread portion 208 (FIG. 1A) on the outer peripheral side of the tip or a female thread portion 210 on the inner peripheral side.
(B)).

In the case of this conventional connection structure, a connection is made by screwing a male thread 208 of a tube 206 into a female thread 202 of a tube 200 as shown in FIG. As shown in (1), by connecting the cap nut 212 of the tube 206 to the male screw portion 204 of the tube 200, the pair of tubes 200, 206 is connected.

The sealing between the pair of pipes 200 and 206 is performed by winding a sealing tape around the male screw portion 208 shown in FIG. 1A and screwing it together, or as shown in FIG. This is performed by sandwiching a packing 214 between the tubular bodies 200 and 206.

However, in the case of the connection structure shown in FIG. 14, it is necessary to rotate the seal tape or use a tool to rotate the screw part many times in order to screw the screw part, and the construction is complicated. There is a problem that a variation in construction occurs due to the degree of winding of the sealing tape and the degree of turning of the screw.

On the other hand, a connection structure as shown in FIG. 15 has recently been used. In this connection structure, a pair of pipes can be connected with one touch by using a clamp member. More specifically, in the figure, reference numeral 216 denotes a cylindrical hollow insertion shaft portion provided on the tube 206 so as to protrude, 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.

Reference numeral 220 denotes a female fitting surface provided on the pipe 200 and having a smooth circular section extending in the pipe axis direction.
Reference numeral 4 denotes a circumferentially continuous flange portion as a flange-shaped portion provided on each of the tubes 200 and 206, and reference numeral 226 denotes an elastic clip as a clamp member.

The elastic clip 226 is formed by bending a band-shaped metal leaf spring material into a substantially ring shape, as shown in FIG.
8 and an engagement groove 230 extending in the circumferential direction at the middle portion in the width direction.

In the case of this connection structure, the insertion shaft portion 216 is inserted into the inside of the tubular body 200 so that the male fitting surface 217 and the female fitting surface 220 are fitted, and the elastic clip 226 is used for fitting. A pair of flange portions 222, 222 of the tubes 200, 206 fitted elastically so as to straddle the tubes 200, 206 through the openings 228 and brought into contact with each other.
The pair of pipes 200 and 206 are connected by engaging 224 in the engagement groove 230 of the elastic clip 226.

In this connection structure, the male fitting surface 217 and the female fitting surface 2 are formed by a seal member 218 such as an O-ring mounted on the male fitting surface 217 as shown in FIG.
20 is sealed watertight. Alternatively, a sealing member 218 made of an O-ring or the like is mounted on the female fitting surface 220, and the male fitting surface 217 and the female fitting surface 2 are attached by the sealing member 218.
20 is sealed watertight. Alternatively, a sealing member is sandwiched between the contact surface 221 of the tube 200 and the contact surface 219 of the tube 206, whereby a pair of the tubes 200 and 2 is inserted.
A seal between 06 may be provided.

The connection structure shown in FIG. 15 enables the connection of the pipes 200 and 206 to be performed very easily with one touch. In recent years, examples of the connection structure have been increased.

[0013]

However, at present, the screw connection method shown in FIG. 14 and the connection method of the fitting portions (male fitting surface and female fitting surface) shown in FIG. 15 coexist. Therefore, when connecting a pair of pipes at a construction site, one of the pipes is of a screw connection type shown in FIG. 14 and the other is a fitting shown in FIG. It may happen that the connection method is used. Alternatively or additionally, it may occur that one of the pipes and the other of the pipes have different connection methods other than those exemplified above. In this case, the two pipes cannot be connected as they are, so that the connection of the pipes may have to be interrupted.

[0014]

The invention of the present application has been made to solve such a problem. The tube connection structure according to claim 1 is a tube connection structure for connecting a pair of tubes, and has a short tube shape and is provided at one end in the tube axis direction for connection with one of the tubes. It has at least two types of connection function parts, and is adapted to connect the pair of pipe bodies via an adapter having a connection function part for connection with the other pipe body at the other end side. .

According to a second aspect of the present invention, in the tube connection structure according to the first aspect, the connection function portion on the other end and one of the two types of connection function portions on the one end side are connected. Each of the two types of connection function portions extends smoothly in the pipe axis direction and forms a male thread portion or a female thread portion. A male fitting surface or a female fitting surface to be inserted and fitted in the pipe axis direction, and the adapter and the one tubular body are fitted at the male fitting surface and the female fitting surface. In this state, the first stopper means stops the tube in the tube axis direction.

According to a third aspect of the present invention, there is provided a tube connecting structure.
In the tube connection structure according to any one of the above, the other end of the adapter is further provided with a different kind of connection function part from the connection function part on the other end side.

According to a fourth aspect of the present invention, in the tube connection structure of the second aspect, a connection function part different from the connection function part on the other end side is further provided at the other end of the adapter. At the same time, another type of connection function portion on the other end side extends smoothly in the tube axis direction and is inserted in the tube axis direction with respect to the female fitting surface or the male fitting surface provided on the other tube body. A male fitting surface or a female fitting surface to be fitted and fitted, and the second stopper is provided when the adapter and the other tube are fitted with the male fitting surface and the female fitting surface. It is characterized in that it is prevented from coming off in the tube axis direction by means.

According to a fifth aspect of the present invention, there is provided the pipe connection structure according to the fourth aspect, wherein the second retaining means is provided outside the pipe shaft provided in the adapter and the other pipe in a direction perpendicular to the pipe shaft. It is characterized by having a flange-shaped portion projecting in the direction, and a clamp member for clamping the flange-shaped portion in the tube axis direction.

A tube connection structure according to claim 6 is a tube connection structure for connecting a pair of tubes, wherein one tube and the other tube are connected via a short-tube adapter. The adapter is provided with different types of connection function portions at one end and the other end in the tube axis direction, and the adapter is different from the other tube by 180 ° in the tube axis direction. It is characterized in that connection can be made in both forward and reverse directions.

According to a seventh aspect of the present invention, in the tube connecting structure according to the sixth aspect, the adapter is provided with a connecting function portion at one end in the axial direction of the tube, and a connecting function portion at the other end.
A connection function part of the same type, and the connection function part on one end side and one of the two connection function parts on the other end side are the same connection function part. It is characterized in that it can be connected to the other tube at either one end or the other end in the axial direction.

According to an eighth aspect of the present invention, in the tube connection structure of the seventh aspect, the connection function part on the one end side and one of the two types of connection function parts on the other end side are connected. Each of the two types of connection function portions extends smoothly in the pipe axis direction and forms a male thread portion or a female thread portion. A male fitting surface or a female fitting surface to be inserted and fitted in the pipe axis direction, and the adapter and the one tubular body are fitted at the male fitting surface and the female fitting surface. In this state, the stopper is stopped in the tube axis direction by the third stopper means.

[0022]

As described above, the pipe connection structure of the first aspect has at least two types of connection function parts for connection to one pipe at one end in the pipe axis direction. The pair of pipes is connected via an adapter having a connection function portion for connection with the other pipe on the end side. According to this pipe connection structure, the other pipe is connected to the other pipe. On the other hand, it is possible to connect at least two types of pipes, that is, two types of pipes (one pipe) each having a different type of connection function unit.

According to a second aspect of the present invention, the connection function portion on the other end side of the adapter is a male screw portion or a female screw portion, which is screw-connected to the other tube body, and two types of connection functions on one end side. One of the parts is a male screw part or a female screw part, that is, a screw connection method, while the other connection function part is a fitting connection method. In the case of this tube connection structure, the other tube is In the case of the screw connection type, even if one of the pipes is of the screw connection type or of the fitting connection type, the pair of pipes can be connected without any trouble.

In the tube connecting structure according to the second aspect, the adapter and one of the tubes are fitted in the male fitting surface and the female fitting surface, and are prevented from being pulled out in the tube axis direction. Is formed so as to have a flange-shaped portion provided on the adapter and one of the tubes so as to protrude outward in the direction perpendicular to the axis, and a clamp member for clamping the flange-shaped portion in the tube axis direction. be able to.

Further, in this case, the clamp member is
A belt-shaped leaf spring material is formed into a substantially ring-like shape, has a fitting opening at a predetermined location in the circumferential direction, and is capable of engaging the flange-shaped portion at a widthwise intermediate portion. It may have an engagement groove extending along the direction.

According to a third aspect of the present invention, the pipe connecting structure further includes another type of connecting function in addition to the connecting function at the other end of the adapter. The adapter can be connected to two different types of tubes (the other tube). That is, according to the tube connection structure of the third aspect, at least two types of tubes (one tube) and two types of tubes (the other tube) can be connected to each other by the common adapter. Becomes

According to a fourth aspect of the present invention, there is provided a tube connecting structure according to the second aspect of the present invention, in addition to the connecting function portion (male thread portion or female thread portion) at the other end of the adapter, as in the third aspect. In addition to having the connection function part of the above, the other type of connection function part is a fitting connection method, and according to this pipe connection structure, one of the pipes is either a screw connection method or a fitting connection method. However, even if the other pipe is of the screw connection type or the fitting connection type, it is possible to connect the one pipe and the other pipe with a common adapter.

In the tube connecting structure of the fourth aspect, the adapter and the other tube are fitted in the male fitting surface and the female fitting surface, and are prevented from being pulled out in the tube axial direction. A flange-shaped portion provided in such a manner as to protrude outward in the direction perpendicular to the axis on each of the adapter and the other tubular body,
It can be configured to have a clamp member that clamps the flanges in the tube axis direction (claim 5). With this configuration, the retaining means can be simply configured, and the adapter and the other tube can be reliably retained.

In this case, the clamp member is formed in the same manner as described above by bending a band-shaped leaf spring material into a substantially ring shape, and has a fitting opening at a predetermined position in the circumferential direction. In addition, it is possible to provide an engaging groove extending along the circumferential direction, in which the flange-shaped portion can be engaged at the intermediate portion in the width direction.

[0030] Next, the pipe connection structure according to claim 6 uses an adapter having different types of connection function portions at one end side and the other end side in the pipe axis direction, and connects the adapter to the other pipe body. 1 in direction
In this connection structure, the connection direction of the adapter with respect to the other pipe is changed by 180 °, that is, the connection is made in the opposite direction. By doing so, it is possible to connect two different types of tubes (one tube) to the other tube.

In this case, the other pipe body may be provided with two types of connection function units that can be connected to any of the other types of connection function units of the adapter.
With this configuration, the connection direction of the adapter with respect to the other tubular body can be easily reversed.

Alternatively, a connection function section is provided at one end of the adapter, and two kinds of connection function sections are provided at the other end, and one of the two connection function sections is connected to the connection function section at the one end side. Can be the same kind of connection function unit (claim 7). Also in this case, the connection direction of the adapter with respect to the other tube can be easily reversed.

In the tube connecting structure according to claim 7, one of the connection function part on one end and one of the two connection function parts on the other end is formed as a male screw part or a female screw part, respectively. The other of the types of connection function portions is made a male fitting surface or a female fitting surface, and the adapter is fitted with one of the pipes at the fitting surfaces so that the pipe shaft is secured by the third retaining means. It can be made to stop in the direction (claim 8). According to this connection structure, by connecting the adapter to the other pipe in either the forward direction or the reverse direction, even if one pipe is of the screw connection type, Even if it is, it is possible to connect to the other pipe without any trouble.

In the tube connection structure according to the eighth aspect, the third stopper means is provided on each of the adapter and the one of the tubes so as to protrude outward in a direction perpendicular to the tube axis. And a clamp member for clamping the flanges in the tube axis direction.

In this case, the clamp member is formed by bending a band-shaped leaf spring material into a substantially ring shape, has a fitting opening at a predetermined position in the circumferential direction, and has an intermediate portion in the width direction. The portion may be provided with an engaging groove which can be engaged with the flange-shaped portion and extends along the circumferential direction.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1A, reference numeral 10 denotes a pair of tubular bodies 1.
The adapter for connecting the tubes 2 and 14 has a short tubular shape, and has a male screw portion (connection function portion) 16 and a female fitting surface (connection function portion) 18 at one end in the tube axis direction. The female fitting surface 18 is a surface having a circular cross section and extending smoothly in the tube axis direction.

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

In the case of the pipe connection structure of this example, when one of the pipes 12 has a female screw portion 28, the female screw portion 28 is screw-connected to the male screw portion 16 of the adapter 10 to form a pair of pipes. The bodies 12, 14 can be connected via the adapter 10.

One tubular body 12 has an annular flange portion 30 as a flange-like portion, a cylindrical insertion shaft portion 32 protruding in the tube axis direction, and a tube shaft having a circular cross section on the outer peripheral side of the insertion shaft portion 32. In the case of having a male fitting surface 34 extending smoothly in the direction, the male fitting surface 34 is inserted into the female fitting surface 18 of the adapter 10 and an O-ring attached to the male fitting surface 34. In a state where they are fitted in a watertight manner via the pipe 36, they are prevented from being pulled out in the pipe axis direction by an elastic clip 38 as a clamp member, so that the pair of pipes 12, 1
4 can be connected via the adapter 10.

The sealing member 36 may be mounted on the female fitting surface 18 in advance, so that the male fitting surface 34 and the female fitting surface 18 are sealed in a watertight manner. By sandwiching a ring-shaped sealing member in the pipe axis direction between one of the pipes 12 and the adapter 10, the space between them can be sealed in a watertight manner. This is the same in the following embodiments.

The elastic clip 38 is formed by bending a band-shaped leaf spring material into a substantially ring shape. The elastic clip 38 has a fitting opening 40 at a predetermined position in the circumferential direction. An escape portion 44 is formed to avoid interference.
An engagement groove 42 extends along the circumferential direction at the middle portion in the width direction, and furthermore, a guide portion 46 opened in a C shape is formed following the fitting opening 40.

The elastic clip 38 is elastically fitted so as to straddle the adapter 10 and the one tube 12, and the flange portion 22,
The adapter 10 and one of the tubes 12 can be prevented from coming off in the tube axis direction by engaging the 30 with the engagement groove 42 of the elastic clip 38. That is, in this example, the flange portions 22 and 30 and the elastic clip 3 as a clamp member are used.
8 constitutes a retaining means.

FIG. 5B shows an example in which a tube is connected using an adapter 10 of another form. In this example, a female screw portion (connection function portion) 48 is used instead of the male screw portion 16. It is provided in. Note that the adapter 10 is provided with the female fitting surface 18, the male screw portion 24, and the flange portion 22 as in the above embodiment.

In the case of the example shown in FIG.
In the case where 2 has the male screw portion 50, by connecting the male screw portion 50 to the female screw portion 48 of the adapter 10, the pair of pipes 12 and 14 can be connected via the adapter 10. Also, one of the pipes 12 is the male fitting surface 3
(A) in the case of the fitting connection method having
In the same manner as shown in FIG.
4 can be connected via the adapter 10. That is, also in this example, two pipes 12 of different types can be handled by the common adapter 10.

In the example shown in FIG. 9C, a cylindrical insertion shaft 52 is provided on the adapter 10 in place of the female fitting surface 18 in FIG. This is an example of a case where a male fitting surface (connection function part) 54 extending to the side is provided.

In the case of this example, when one of the tubes 12 has a male thread portion 50, this is screw-connected to the female thread portion 48 of the adapter 10, so that the pair of tubes 12, 1 is formed.
4 can be connected via the adapter 10, and when one of the tubes 12 has a female fitting surface 56, the female fitting surface 56 is inserted into the male fitting surface 54 of the adapter 10 to connect them. The male mating surface 54 and the female mating surface 56 are
The adapter 10 and one of the pipes 12 are prevented from being pulled out in the pipe axis direction by the elastic clip 38 in a state where the pipes are sealed in a water-tight manner through the seal member 36 attached to the pipe 4.
2, 14 can be in a connected state.

The seal member 36 is mounted on the female fitting surface 56 side to seal the male fitting surface 54 and the female fitting surface 56 in a water-tight manner, or by using the adapter 10 and the tube 12 together. As described above, it is possible to seal between the ring-shaped sealing members by sandwiching them in the tube axis direction.

The example of FIG. 1D shows still another example, and the pipe connection structure of this example is the adapter 1 of FIG. 1A.
0 instead of the female fitting surface 18, the cylindrical insertion shaft 5
2 is provided on the adapter 10 and a male fitting surface 54 having a circular cross section 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 of the pipes 12 has a female thread 28, the female thread 28 is screw-connected to the male thread 16 of the adapter 10 to connect the pair of pipes 12, 14. The connection can be made via the adapter 10.

When one of the tubes 12 has a female fitting surface 56, the female clip surface 56 is fitted to the male fitting surface 54 of the adapter 10, and then the elastic clip 38 is used. Is prevented in the tube axis direction, the pair of tubes 12 and 14 can be connected.

In each of the examples shown in FIG. 1, the adapter 10 has a male thread 24 on the connection side with one of the pipes 14 and the male thread 2
4 is an example in which the screw is connected to the female screw portion 26 of the other tube 14. As shown in FIG. 2, the male screw portion 24 is connected to the adapter 10 for connection with the other tube 14. Alternatively, a female screw portion (connection function portion) 58 may be provided, and the female screw portion 58 may be screw-connected to the male screw portion 60 of the other tube 14.

Each of the examples of FIGS. 2A, 2B, 2C, and 2D has the same structure as that of FIGS. 1A, 1B, 1C, and 1C of FIG.
Since it is the same as the example of (D), only the reference numeral is shown here and further detailed description is omitted.

Next, in each example of FIG. 3, a male fitting surface (connection function portion) 64 having a cylindrical insertion shaft portion 62 provided on the adapter 10 and 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 and connected to the female fitting surface 66 of the other tube body 14, and these are prevented from being pulled out in the tube axial direction by the elastic clip 38 as a clamp member.

More specifically, the elastic clip 38 is connected to the adapter 1
0 and the other tube 14 is elastically fitted so as to straddle the flange portion (flange portion) 68 of the adapter 10 and the flange portion (flange portion) 70 of the other tube 14 with elasticity. By engaging the clip 38 in the engagement groove 42, the adapter 10 and the other tube 14 are prevented from coming off in the tube axis direction.

The examples of FIGS. 3 (A), (B), (C) and (D) are similar to those of FIGS. 1 (A), (B), (C) and (C) of FIG.
Since this is the same as the example of (D), only the reference numerals are shown and further detailed description is omitted.

In each of the examples shown in FIGS. 3A, 3B, 3C, and 3D, in the case where the other tube 14 is of the fitting connection type having the female fitting surface 66, FIG. By using the adapter 10, it is possible to connect two types of pipes (one pipe) 12 having different connection function parts to the other pipe 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
This is an example in which after fitting to the male fitting surface 76 of the insertion shaft portion 74 of the other tube body 14, they are prevented from being pulled out in the tube axis direction by the elastic clip 38 as a clamp member.

Each of the examples of FIGS. 4A, 4B, 4C, and 4D also has the other constitutions shown in FIGS.
Since it is the same as the examples of (C) and (D), only the reference numerals are shown and further detailed description is omitted.

In each of the examples shown in FIGS. 4A, 4B, 4C, and 4D, it is assumed that the other tube 14 is of a fitting connection type having a male fitting surface 76. By using the adapter 10, it is possible to connect two types of pipes (one pipe) 12 having different connection function parts to the other pipe 14.

The above is for connection with the other pipe 14.
This is an example in which the adapter 10 is provided with a single connection function unit. However, as shown in FIGS. 5 to 8, two types of connection function units are provided in the adapter 10 for connection with the other pipe 14. May be provided.

In the example shown in FIG. 5, the external thread 2 is provided on the other end of the adapter 10 in the axial direction, that is, on the side connected to the other pipe 14.
This is an example of a case where a female fitting surface 4 and a female fitting surface 72 are provided. In the case of this example, a common adapter is used regardless of whether the other pipe 14 is of the screw connection type having the female screw portion 26 or of the fitting connection type having the male fitting surface 76. 10 can respond. That is, in the case of the example of FIG. 5, the common adapter 10 can cope with each of the two types of pipes 14 and the two types of pipes 12.

In the example shown in FIG. 5, two adapters similar to those shown in FIG.
Although two types of connection function parts, that is, two types of connection function parts of the male screw part 16 and the female fitting surface 18 are provided as typical examples, the adapter 10 of FIG.
It is also possible to provide two types of connection function units in the same combination as in FIGS.

That is, as shown in FIG. 1B, the adapter 10 may be provided with a combination of the female screw portion 48 and the female fitting surface 18 for connection with one of the pipes 12,
Alternatively, as shown in (C), a combination of the female screw portion 48 and the male fitting surface 54 can be provided. Alternatively, as shown in the example of FIG. 1D, a combination of the male screw portion 16 and the male fitting surface 54 can be provided. This is the same in the embodiments shown in FIGS. 6, 7, and 8 described below.

In the example shown in FIG. 6, the male screw part 24 and the insertion shaft part 62, that is, the male fitting surface 64, are provided at the other end of the adapter 10 in the pipe axis direction for connection with the other pipe body 14. In the case of the tube connection structure of this example, if the other tube 14 is of a screw connection type having a female screw portion 26, the female screw portion 26 is screw-connected to the male screw portion 24 of the adapter 10. , A pair of tubes 12, 14 can be connected.

If the other tube 14 has a flange 70 as a flange for clamping by the female fitting surface 66 and the elastic clip 38, the adapter 1
No. 0 male fitting surface 64 is fitted and connected to the female fitting surface 66 of the other tube body 14, and in this state, the elastic clip 38 is fitted so as to straddle them, and the pair of flanges 68, 70 are connected to the elastic clip 38. By engaging the engagement groove 42 of the
The pair of tubes 12 and 14 can be connected via the adapter 10.

In the example of FIG. 7, the other tube 1 is connected to the adapter 10.
This is an example in which a female screw portion 58 and a male fitting surface 64 are provided for connection with the connector 4. In this case, when the other tube 14 is of a screw connection type having a male screw portion 60, By screwing the male screw part 60 to the female screw part 58 of the adapter 10, the one pipe 12 and the other pipe 14 can be connected.

When the other tube 14 is of a fitting connection type having a female fitting surface 66, the male fitting surface 64 of the adapter 10 is fitted to the female fitting surface 66 of the other tube 14. In this state, the elastic clips 38 are fitted so as to straddle them, and the pair of flanges 68, 70 are engaged with the engaging grooves 42 of the elastic clip 38, and are prevented from being pulled out. 14 can be connected.

FIG. 8 shows an example in which the adapter 10 is provided with a female screw portion 58 and a female fitting surface 72 for connection with the other pipe 14, and in the case of this pipe connection structure. When the other tube 14 is of a screw connection type having a male screw portion 60, the male screw portion 60 is screwed into the female screw portion 58 of the adapter 10 to connect the pair of tubes 12 and 14. .

When the other tube 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. By fitting the elastic clips 38 over them in the state, the pair of tubes 12 and 14 can be connected.

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

On the other hand, the adapter 10 is connected to the other tube 14
And the direction is set to be 180 ° opposite to the tube axis direction, and the male screw portion 86 is screwed to the female screw portion 26 of the other tube body 14 so that one of the tube bodies 12 is connected to the female fitting surface 5.
This can be connected to the other tube 14 even in the case of a fitting connection type having 6.

Specifically, as shown in FIG. 7B, one of the pipes 12 is connected to the male fitting surface 94 of the adapter 10 which is in the opposite direction to the state shown in FIG. Of the elastic clip 38 so as to straddle the adapter 10 and one of the tubular bodies 12, and connect the flange portions 88, 30 to the elastic clip 38. The pair of pipes 12 and 14 can be connected by engaging in the engagement groove 42 and stopping the removal.

In FIG. 9A, the male fitting surface 94 of the adapter 10 is fitted to the female fitting surface 66 of the other tube 14, and the male screw portion 90 and the female screw portion 26 are screwed together. The adapter 10 and the other tube 14 are prevented from coming off. That is, in this example, the male screw part 90 and the female screw part 2
6 constitute the retaining means.

In this example, two types of connection functions of the adapter 10, that is, two types of connection functions of the male screw portion 90 and the male fitting surface 94 are simultaneously used by the corresponding two types of connection functions of the other tube 14. Portion, that is, the female screw portion 26 and the female fitting surface 66, but the threaded portion between the male screw portion 90 and the female screw portion 26 is sealed in a watertight manner, or the adapter 10 and the other tube 14 are connected to each other. By sealing the ring-shaped sealing member in the tube axis direction and sealing, the male fitting surface 94 can be loosely fitted to the female fitting surface 66.

That is, only in the male screw portion 90, the adapter 1
0 can be screw-connected to the female thread portion 26 of the other tube 14. Therefore, the male fitting surface 94 of the adapter 10 is
It is not always a necessary condition to fit the female fitting surface 66 of the fourth watertight.

The example of FIG. 10 is a modification of the example of FIG. In this example, the adapter 10 does not include the male thread portion 90, the adapter 10 is fitted on the female fitting surface 66 at the male fitting surface 94 with respect to the other tube 14, and the elastic clip 38 The flange portions 104 and 70 are prevented from coming off in the tube axis direction.

Also in this case, as shown in FIG.
The pair of pipes 12 and 14 can be connected by screw connection of 8. On the other hand, as shown in FIG. 4B, the adapter 10 is turned in the opposite direction, and the male screw portion 86 is screw-connected to the female screw portion 26 of the other tubular body 14. By preventing the tube 12 from coming off, one of the tubes 12 having the female fitting surface 56 can be fitted and connected to the adapter 10. That is, one tube 12 having the female fitting surface 56 can be connected to the other tube 14 via the adapter 10.

FIG. 11 shows an example in which the female thread 96, the female fitting surface 98 and the flange 10
0, and a female screw portion 102 of the same type as the female screw portion 96 at one end. In this case,
As shown in FIG. 3B, the female threaded portion 102 is screw-connected to the male threaded portion 60 of the other tube 14, and in this state, the male fitting surface 34 of one tube 12 is connected to the female fitting surface 98 of the adapter 10. The pair of pipes 12 and 14 can be connected to each other by fitting and connecting them to each other, and by retaining them with the elastic clip 38.

On the other hand, as shown in (A), the adapter 10 is pulled out of the other tube 14 and the direction is reversed, and the female screw 96 is screwed to the male screw 60 of the other tube 14. The female screw 10
The pair of pipes 12 and 14 can be connected by screwing the male screw part 50 of one pipe 12 to 2. That is, also in this example, by using the common adapter 10 and reversing the direction, it is possible to connect one tube 12 of a different type to the other tube 14.

FIG. 12 shows still another example. The adapter 10 of this example is provided with a female screw 96 and a flange 88, an insertion shaft 92, and a male fitting surface 94 on the outer peripheral surface on the other end in the pipe axis direction, and has the same type of female screw as the female screw 96 on one end. A section 102 is provided.

In the case of this example, the adapter 10 is screw-connected to the male screw portion 60 of the other tube 14 at the female screw portion 102 as shown in FIG. One tube 12 can be connected to the other tube 14 via the adapter 10.

More specifically, in a state where 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 88 of the adapter 10 is formed by the elastic clip 38.
The tube bodies 12 and 14 can be connected by sandwiching the and the flange portion 30 of one tube body 12 in the axial direction.

On the other hand, when one of the tubes 12 has the male screw portion 50 as shown in FIG. 11A, the adapter 10 is removed from the other tube 14 and the orientation is reversed. In the case where one of the pipes 12 has the male screw portion 50, such a pipe 12 and the other pipe 1
4 can be connected.

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

In the case of the tube connection structure of this example, FIG.
When one of the pipes 12 is of a fitting connection type having a male fitting surface 34 as shown in FIG. 3, the adapter 10 is screw-connected to the female thread 26 of the other pipe 14 at the male thread 90. , One tube 1 with respect to the female fitting surface 106
The two male fitting surfaces 34 are fitted and connected, and the elastic clips 38
By stopping the adapter 10 and one of the pipes 12 at the above, the pair of pipes 12 and 14 can be connected.

On the other hand, when one of the pipes 12 is of a screw connection type having a female threaded portion 28 as shown in (A), the adapter 10 is removed from the other pipe 14 and the direction is reversed. With the orientation, the male screw 86 is screwed to the female screw 26 of the other tube 14. Then, by screwing the female screw portion 28 of one tube 12 to the male screw portion 90, the pair of tubes 12 and 14 can be connected.

Although the embodiments of the present invention have been described in detail above, these are merely examples, and in the present invention, an external thread portion and an internal thread portion are provided as one of two types of connection function portions at one axial end of the adapter. Alternatively, the present invention can be configured in a form in which various changes are made without departing from the gist of the invention, such as providing a male screw part and a female screw part as two types of connection function parts on the other end side in the axial direction. is there.

[Brief description of the drawings]

FIG. 1 is a view showing a pipe connection structure according to an embodiment of the present invention.

FIG. 2 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 3 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 4 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 5 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 6 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 7 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 8 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 9 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 10 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 11 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 12 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 13 is a view showing a tube connection structure according to still another embodiment of the present invention.

FIG. 14 is a diagram showing an example of a conventional pipe connection structure.

FIG. 15 is a view showing another example of the conventional pipe connection structure different from FIG. 14;

[Explanation of symbols]

 10 Adapter 12,14 Tube 16,24,86,90 Male thread 18,72,98,106 Female fitting surface 22,30,68,70 Flange (flange) 26,28 Female thread 34,76 Male Fitting surface 38 Elastic clip (clamp member) 48, 58, 96, 102 Female thread 54, 64, 94 Male fitting 56, 66 Female fitting 50, 60 Male thread 58 Female thread

Claims (8)

[Claims] 1. A pipe connecting structure for connecting a pair of pipes, wherein the pipe connecting structure comprises a short pipe, and at least one type of connection function section for connecting to one pipe at one end side in a pipe axis direction. And a pipe connecting structure for connecting the pair of pipes via an adapter having a connection function portion for connecting to the other pipe on the other end side. 2. The tubular body connection structure according to claim 1, wherein the connection function part on the other end and one of the two connection function parts on the one end side are a male screw part or a female screw part, respectively. And the other of the two types of connection function units,
There is no male fitting surface or female fitting surface that extends smoothly in the tube axis direction and is inserted and fitted in the tube axis direction with respect to the female fitting surface or the male fitting surface provided on the one tubular body. Wherein the adapter and the one of the tubes are fitted in the male fitting surface and the female fitting surface in a state where they are fitted in the tube axial direction by first retaining means. Pipe connection structure. 3. The tubular body connection structure according to claim 1, further comprising a connection function unit on the other end side of the adapter, which is different from the connection function unit on the other end side. A pipe connection structure, characterized in that: 4. The tube connection structure according to claim 2, wherein the other end of the adapter further includes a connection function unit different from the connection function unit on the other end and the other end. Male fitting that extends smoothly in the pipe axis direction and is inserted and fitted in the pipe axis direction with the female fitting surface or the male fitting surface provided on the other pipe body. Surface or a female fitting surface, and the adapter and the other tube are prevented from being removed in the axial direction of the tube by the second retaining means in a state where the male fitting surface and the female fitting surface are fitted to each other. A pipe connection structure characterized in that the connection is made. 5. The pipe connection structure according to claim 4, wherein said second stopper means is provided with a flange-like portion projecting outward in a direction perpendicular to a pipe axis provided on each of said adapter and said other pipe. And a clamp member for clamping the flanges in the tube axis direction. 6. A pipe connecting structure for connecting a pair of pipes, wherein one of the pipes and the other pipe are connected via an adapter which forms a short tube. Has a different type of connection function part at one end and the other end in the tube axis direction, and connects the adapter to the other tube body in either the forward or reverse direction by 180 ° in the tube axis direction. A pipe connection structure characterized in that connection is possible even in an orientation. 7. The tube connection structure according to claim 6, wherein the adapter has a connection function portion at one end in the tube axis direction and two types of connection function portions at the other end. The connection function part on one end side and one of the two connection function parts on the other end side are the same connection function part, so that the adapter is connected to one end side and the other end side in the tube axis direction. In any one of the above, the pipe connection structure can be connected to the other pipe. 8. The tubular body connection structure according to claim 7, wherein the one end of the connection function part and one of the two connection function parts on the other end side are a male screw part or a female screw part, respectively. And the other of the two types of connection function units,
There is no male fitting surface or female fitting surface that extends smoothly in the tube axis direction and is inserted and fitted in the tube axis direction with respect to the female fitting surface or the male fitting surface provided on the one tubular body. The adapter and the one pipe body are fitted in the male fitting face and the female fitting face, and are prevented from being pulled out in the pipe axis direction by third locking means. Pipe connection structure.