JP2006125590A - Pipe connection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily connect each end of the fixed pipes arranged at narrow distance by a connecting pipe. <P>SOLUTION: The pipe connection method connects each end of the fixed pipes 1, 2 fixed with an distance almost coaxially by a connecting pipe 10. The first gradient cut end face 7 is formed to at least one end of the fixed pipe 1, 2 beforehand and the connecting pipe 10 having the longer length than the distance between ends of the fixed pipe 1, 2 and the second gradient cut face 11 corresponding to the first gradient cut end face 7 is supported by the fixed pipe 1, 2 by engaging it to an engagement part 8, 9 at the end part of each fixed pipe 1, 2 so that the second gradient cut end face 11 faces to the first gradient cut end face 7 and both ends of the connecting pipe 10 are fixed to each end part of the fixed pipe 1, 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe connection method, and more particularly to a pipe connection method suitable for connecting ends of fixed pipes arranged at narrow intervals with a connection pipe.

  Conventionally, after the apparatus device is arranged in various apparatus devices, it may be necessary to connect the fixed pipes provided in the device apparatus with connection pipes, for example, especially around the engine of an automobile. In a device installed in a narrow space, it is desirable to have a structure in which fixed pipes can be easily connected with connection pipes even in a narrow space.

  FIG. 6 shows that the fixed pipes 1, 2 having the same inner diameter D1 and outer diameter D2 and having an interval A between them are fixed on the substantially concentricity of the apparatus body 6 between the ends. This shows an example of connection using the connection pipe 3 having a diameter smaller than the outer diameter D2 of the pipes 1 and 2 and longer than the interval A, and the thickness of one end of the fixed pipe 1 is cut. Then, a fitting portion 4 having a diameter D3 into which the one end 3a of the connection pipe 3 can be fitted is formed, and a diameter larger than the diameter D3 of the fitting portion 4 is formed at the end portion of the other fixed pipe 2. The adjustment fitting part 5 which has D4 and is formed by cutting or a material so as to have a deep depth and can be fitted to the other end 3b of the connection pipe 3 is formed.

  Then, in order to connect the fixed pipes 1 and 2 with the connection pipe 3, as shown in FIG. 7, first, the other end 3b of the connection pipe 3 is inserted in the direction a to the inner back of the adjustment fitting part 5, and connected. In a state where the pipe 3 is substantially horizontal, the connection pipe 3 is returned to the direction b, whereby the connection pipe 3 is supported by the fitting portion 4 and the adjustment fitting portion 5, and in this state, both ends 3 a, 3b is fixed to the fixed pipes 1 and 2 by welding, brazing, adhesive or the like.

  However, when the other end 3b of the connection pipe 3 is inserted into the inner part of the adjustment fitting portion 5, one end 3a of the connection pipe 3 interferes with the peripheral surface of the end of the fixed pipe 1, so that the connection pipe 3 is Therefore, the fixed pipe 2 needs to have an adjustment fitting portion 5 having a large diameter D4 as shown in FIG. For this reason, the thickness of the adjustment fitting part 5 becomes thin, and when the connection pipe 3 is fixed to the fixed pipes 1 and 2 by welding or the like, welding may be difficult or impossible. Therefore, in this case, it is necessary to increase the thickness of the adjustment fitting portion 5 of the fixed pipe 2 and use a thick fixed pipe 2. In this case, the fixed pipe 1 and the fixed pipe 2 are different in thickness. There is a problem that becomes. Further, since the adjustment fitting portion 5 has a large diameter D4, as shown in FIG. 8, the fitting portion 4 of the fixed pipe 1 and the connection pipe 3 supported by the adjustment fitting portion 5 of the fixed pipe 2 are inclined. As a result, a large gap S is formed between the upper surface of the other end 3b of the connection pipe 3 and the inner surface of the adjustment fitting portion 5, so that there is a problem that the work for welding the gap S becomes very difficult.

  Furthermore, since the connection pipe 3 is fixed in an inclined state with respect to the fixed pipes 1 and 2 as shown in FIG. In addition, since the end faces of the fixed pipes 1 and 2 are formed perpendicular to the axial lines of the fixed pipes 1 and 2, particularly when the apparatus main body side (lower surface) of the connection pipe 3 is welded. However, there is a problem that work efficiency is poor and welding efficiency is liable to occur.

  On the other hand, as described above, there are various methods for connecting the connection pipe to the fixed pipe. For example, Patent Document 1 discloses one.

Patent Document 1 is connected to the tip of one pipe and has a flare bolt having a tapered inclined surface at the outer periphery of the tip, and is inserted into the tip of the other pipe and parallel to the inclined surface of the flare bolt. A flare nut having an inclined portion, and another pipe having a flare processing portion corresponding to the inclined surface of the flare bolt with the tip portion expanded, and the flare processing portion of the pipe is flare by tightening the flare nut. Connect to the inclined surface of the bolt.
JP-A-10-115390

  However, in the case of the apparatus shown in Patent Document 1, as shown in FIG. 6, when it is attempted to connect a narrow interval A between the fixed fixed pipes 1 and 2 by a pipe having a flare processing portion, the interval is set. The other pipe having the same length as A cannot be connected, and the other pipe longer than the interval A is bent in advance, and the other pipe is linearly connected by tightening the flare nut. Therefore, the other piping needs to have a flexible structure, and the structure becomes complicated. Further, the method of tightening with the flare nut has a problem that the entire structure is complicated and the weight is increased.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a pipe connection method that can easily connect ends of fixed pipes arranged at a narrow mutual distance with a connection pipe. .

  The present invention is a pipe connection method for connecting between ends of fixed pipes fixed on a substantially concentric space with a connection pipe, and is connected to at least one of the ends of the fixed pipe in advance. An inclined cut surface is formed, and a connecting pipe having a length longer than an end interval of the fixed pipe and having a second inclined cut surface corresponding to the first inclined cut surface is connected to the second inclined cut surface. The fixed pipe is supported by fitting the fitting part of each fixed pipe end so that the surface faces the first inclined cut surface, and both ends of the connection pipe are fixed to each end of the fixed pipe. This relates to a pipe connection method characterized by the above.

  According to the pipe connection method, by fitting both ends of the connection pipe to the fitting section of the fixed pipe so that the second inclined cut face of the connection pipe corresponds to the first inclined cut face of the fixed pipe. Support the connecting pipe on the fixed pipe. At this time, the first inclined cut surface of the fixed pipe and the second inclined cut surface of the connection pipe allow the connection pipe to be fitted to the fitting part of the fixed pipe at a small inclination angle. The gap between the fitting portion of the fixed pipe is also reduced. When the gap is thus reduced, the operation of fixing the connecting pipe to the end of the fixed pipe becomes easy. Furthermore, when the first inclined cut surface faces outward, the operation of fixing the connecting pipe to the fixed pipe by welding or the like becomes easy.

  In the pipe connection method, the fixed pipe may be a water pipe provided in the EGR cooler. In this case, for example, a plurality of EGR cooler fixed pipes can be easily connected by the connection pipe.

  According to the pipe connection method of the present invention, the second inclined cut surface of the connection pipe corresponds to the first inclined cut surface of the fixed pipe, so that both ends of the connection pipe can be easily fitted to the fitting section of the fixed pipe. By fitting, the connection pipe can be fitted to the fitting part of the fixed pipe at a small inclination angle, and thus the gap between the end of the connection pipe and the fitting part of the fixed pipe can be reduced. Since the gap between the end of the connection pipe and the fitting part of the fixed pipe is small, the operation of fixing the connection pipe to the end of the fixed pipe by welding or the like is facilitated. Further, the first inclined cut surface An excellent effect that the operation of fixing the connecting pipe to the fixed pipe by welding or the like becomes easier by directing the surface outward.

  Further, when the fixed pipe is a water pipe provided in the EGR cooler, for example, there is an effect that a plurality of EGR coolers can be easily and simply connected by connecting pipes to reduce the size and weight of the EGR cooler.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show an example of an embodiment for carrying out the present invention, FIG. 1 is a partially cut side view showing an example of a pipe connection method, and FIG. 2 is a fitting of the connection pipe of FIG. 1 to a fixed pipe. FIG. 3 is an operation explanatory diagram showing a state in which the connection pipe of FIG. 1 is welded to the fixed pipe, and the same components as those in FIGS. ing.

  As shown in FIG. 1, a first inclined cut surface 7 is formed in advance at the end of one fixed pipe 1 in fixed pipes 1 and 2 that are arranged substantially concentrically with an interval A therebetween. The first inclined cut surface 7 can be formed at an inclination angle of, for example, 30 to 60 ° with respect to the axial center line of the fixed pipe 1, and FIG. The first inclined cut surface 7 is formed so that the inclined surface faces the outer side (the upper side in FIG. 1) opposite to the apparatus main body 6.

  The first inclined cut surface 7 is formed with a fitting portion 8 into which one end of a connection pipe 10 to be described later is fitted, and the fitting portion 8 is slanted along the first inclined cut surface 7. Further, it may be formed by cutting into a portion or a fitting portion 8 ′ formed concentrically with respect to the axial line of the fixed pipe 1 as indicated by a broken line in FIG. 1. Further, the end face of the other fixed pipe 2 is formed perpendicular to the axial line, and a fitting portion 9 to which the other end of the connecting pipe 10 described later is fitted is formed on the end face. The joint portion 9 is formed concentrically with respect to the axial core line. The ends of the fixed pipes 1 and 2 may be formed by cutting or may be formed of a material.

  The connecting pipe 10 has a length longer than the distance between the first inclined cut surface 7 of the one fixed pipe 1 and the end face of the other fixed pipe 2, and one end 10a of the connecting pipe 10 has A second inclined cut surface 11 having the same inclination angle is formed corresponding to the first inclined cut surface 7. Further, the other end 10 b of the connection pipe 10 is an end face perpendicular to the axial core line of the connection pipe 10.

  Next, a pipe connection method according to the configuration shown in FIGS.

  In order to connect the fixed pipes 1 and 2 in FIG. 1 with the connection pipe 10, first, the second inclined cut surface 11 of the connection pipe 10 faces the first inclined cut surface 7 of the fixed pipe 1 as shown in FIG. 2. As described above, the other end 10b of the connection pipe 10 is inserted in the direction a to the inner back of the fitting portion 9, and the connection pipe 10 is returned to the direction b in a state where the connection pipe 10 is substantially horizontal. The connecting pipe 10 is supported by the fitting portion 8 and the fitting portion 9, and in this state, as shown in FIG. 3, both ends 10 a, 10 b of the connecting pipe 10 are welded to the fixed pipes 1, 2 by brazing, adhesive, etc. Fix it.

  In the above, by connecting the first inclined cut surface 7 provided in the fixed pipe 1 and the second inclined cut face 11 provided in the connecting pipe 10, the connecting pipe 10 fixes the other end 10 b to the other with a small inclination angle. The fitting portion 9 of the pipe 2 can be fitted, so that the gap between the other end 10b of the connection pipe 10 and the fitting portion 9 of the other fixed pipe 2 can be reduced. When this gap becomes small, the operation of fixing the connection pipe 10 to the end of the fixed pipe 2 by welding or the like becomes easy. Further, at this time, as shown in FIG. 3, the connecting pipe 10 is fixed by welding or the like by forming it in advance so that the inclined surface of the first inclined cut surface 7 faces the outer side opposite to the apparatus body 6. The work of fixing to 1 becomes easy.

  FIG. 4 shows another embodiment of the present invention, in which first inclined cut surfaces 7a and 7b are formed and fitting portions 8a and 8b are formed at the ends of the fixed pipes 1 and 2, respectively. is doing. The first inclined cut surfaces 7 a and 7 b are formed so that the respective inclined surfaces face the outer side opposite to the apparatus main body 6. On the other hand, second inclined cut surfaces 11a and 11b corresponding to the first inclined cut surfaces 7a and 7b are formed at both ends 10a and 10b of the connection pipe 10, respectively.

  According to the configuration of FIG. 4, the inclination angle when the other end 10b of the connection pipe 10 is inserted into the fitting portion 8b of the other fixed pipe 2 can be further reduced, so that the connection pipe 10 and the fitting portion 8b It is not necessary to provide a gap between them, so that fixing work such as welding is further facilitated. Further, the connecting pipe 10 is fixed to the fixed pipes 1 and 2 by welding or the like by forming in advance such that the inclined faces of the first inclined cut surfaces 7a and 7b face the outer side opposite to the apparatus body 6. This makes it easier to perform operations.

  FIG. 5 shows a case where the pipe connection method is applied to a water pipe provided in an EGR cooler. FIG. 5 shows a case in which the cooling water fixed pipes 1 and 2 fixed to a plurality (two) of the EGR coolers 12 and 13 are connected to each other by the connection pipe 10. Also in the case of FIG. 5, as shown in FIG. 4, the first inclined cut surfaces 7a and 7b are formed at the ends of the fixed pipes 1 and 2, and the second inclined cut surfaces 11a are formed at both ends 10a and 10b of the connection pipe 10. 11b may be formed.

  According to the configuration of FIG. 5, the fixed pipes 1 and 2 of the plurality of EGR coolers 12 and 13 can be easily and simply connected by the connection pipe 10, and the EGR coolers 12 and 13 can be reduced in size and weight.

  In addition, in the said form, although the case where the fixed piping of several EGR coolers was connected by connection piping was demonstrated, it can apply when connecting between fixed piping with which various apparatus main bodies are connected with connection piping, others Of course, various modifications can be made without departing from the scope of the present invention.

It is a partial cut side view which shows an example of the piping connection method which implements this invention. It is effect | action explanatory drawing which shows the state which fits the connection piping of FIG. 1 to fixed piping. It is effect | action explanatory drawing which shows the state which welds the connection piping of FIG. 1 to fixed piping. It is a partial cutaway side view showing other forms of the present invention. It is explanatory drawing at the time of applying the pipe connection method of this invention to the water piping with which an EGR cooler is equipped. It is a partial cutting side view which shows an example of the conventional structure which connects between fixed piping with connection piping. It is effect | action explanatory drawing which shows the state which fits the connection piping of FIG. 6 to fixed piping. It is effect | action explanatory drawing which shows the state which welds the connection piping of FIG. 6 to fixed piping.

Explanation of symbols

1, 2 Fixed piping 7a, 7b First inclined cut surface 8, 8 'Fitting portion 9 Fitting portion 10 Connection piping 10a One end 10b Other end 11a, 11b Second inclined cut surface 12, 13 EGR cooler A Interval

Claims (2)

  A pipe connection method for connecting between ends of fixed pipes fixed on a substantially concentric space with a connection pipe, wherein a first inclined cut surface is previously provided on at least one of the end parts of the fixed pipe. A connecting pipe having a second inclined cut surface corresponding to the first inclined cut surface and having a length longer than an end interval of the fixed pipe is formed in the first inclined cut surface. The fixed pipe is supported by being fitted to the fitting part of each fixed pipe end so as to face the inclined cut surface, and both ends of the connection pipe are fixed to each end of the fixed pipe. Piping connection method.   The pipe connection method according to claim 1, wherein the fixed pipe is a water pipe provided in an EGR cooler.

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