JP2018146096A - Conduit line connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a conduit line to a cylindrical connecting part in an easy and less-expensive manner by a simple configuration.SOLUTION: A first expanding part 3 and a second expanding part 4 expanded out in a ring-like manner at an outer peripheral side through spacing to each other are formed at a connecting extremity end side of a conduit line 1, a ring member 5 is arranged and fixed to an outer peripheral side of the second expanding part 4 under a state in which it covers said second expanding part 4, an end part opposite to a connecting extremity end side of the conduit line 1 at the ring member 5 is formed with a flange part 8 expanded outside. An O-ring 6 is installed at an outer peripheral side of the conduit line 1 between an end part at the extremity end side of the ring member 5 and the first expanding part 3. A length from the connecting extremity end of the conduit line 1 to a flange forming position of the ring member 5 is formed to be less than a length of a cylinder at a cylindrical part 2 to be connected, an outer diameter of the ring member 5 is formed to a substantial same size as the inner diameter of the cylindrical part 2 to be connected and an inserting length of the conduit line 1 into the cylindrical part 2 to be connected is restricted by the flange part 8 of the ring member 5 when the connecting end side of the conduit line 1 is fitted to the cylindrical part 2 to be connected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe connection structure for connecting a pipe such as a water pipe provided in a heat source device such as a water heater to a connected portion thereof.

  As is well known, a water heater has a function of heating hot water with a combustion device such as a burner to form hot water and supplying hot water to a hot water supply destination through a hot water supply pipe. A water pipe is provided. Similarly, a water pipe is provided in a heat source device other than the water heater. Some of these water pipes are formed by copper pipes.

  FIG. 4 is a schematic perspective view showing an example of a connection method for connecting the copper pipe line 1 to a resin connected body 10 as a connected portion. A to-be-connected body 10 shown in the figure has a cylindrical connecting portion 2 formed in a cylindrical shape having a uniform inner diameter (including a substantially uniform uniform shape), and a pipe line 1 is connected to the cylindrical connecting portion 2. FIG. 5 schematically shows a cross-sectional configuration of the connection end side of the tubular connection portion 2 and the pipe line 1.

  As shown in these drawings, a connecting end member 12 made of brass is fixed to the connecting tip end side of the pipe line 1 by brazing, and the connecting end member 12 has a recess 21 on the connecting tip end side. In the vicinity of the connection portion formed with the pipe line 1, a hook-like portion 20 is formed protruding outward. The O-ring 6 is fitted in the recess 21 (not shown in FIG. 4). The gap between the two parts to be sealed with the O-ring 6 (here, between the connected side and the connected side) and the dimensions of the groove into which the O-ring 6 is inserted are JIS standards (for example, JISB2406 Table 1 Appendix Table 1) Etc.).

  In FIG. 4, the brass portion is hatched and the stainless steel portion is dotted. The outer diameter of the connection end member 12 from the connection tip side to the formation position of the flanged portion 20 is formed to be substantially equal to the inner diameter of the cylindrical connection portion 2 except for the formation portion of the recess 21. On the distal end side, a hook-like portion 18 projecting outward is formed.

As shown in FIGS. 4 and 5 (a), the distal end side of the pipe 1 and the connecting end member 12 fixed to the distal end of the conduit 1 is disposed opposite to the distal end side of the cylindrical connecting portion 2, and FIG. ), The pipe 1 is connected to the cylindrical connecting portion 2 by inserting the connecting end member 12 into the cylindrical connecting portion 2, and at that time, S ₁ in FIG. and the outer peripheral wall of the connecting end member 12 the inner wall of the cylindrical connecting portion 2 and the portion of S ₂ is, for example, gaps or the like of the fitting tolerance is defined in JIS standards, for example, connecting end member to the tubular connection portion 2 12 is brought into a contact state (substantially contact state) in an insertion state with a fitting tolerance through a slight gap that does not prevent insertion (a gap is not shown in the sectional view of FIG. 5 and the like).

In FIG. 5C, for the sake of easy understanding of the drawing, the region indicated by S ₁ and S ₂ is shown as a thick line and only the upper half side of the cross section is shown, but S ₁ and S ₂ indicate it. An area | region becomes a mode which contacts the inner wall side of the cylindrical connection part 2 in the circumferential direction of the pipe line 1, and an actual connection state will be a state as shown in FIG.5 (b).

  By providing the O-ring 6 on the connection end member 12, the connection end member 12 and the cylindrical connection portion 2 are connected in a liquid-tight manner, and the pipe line 1 is connected to the cylindrical connection portion 2 in a liquid-tight manner. Then, after the connection, as shown in FIG. 4, the connection portion using the clip 13 or the like is fixed.

JP-A-6-174166

  However, in the connection method as shown in FIGS. 4 and 5, a large brass connection end member 12 must be brazed to the connection end side of the pipe line 1, and there are various problems as follows. It was. That is, for example, since the inner diameter of the connecting end member 12 is smaller than the inner diameter of the pipe 1, the flow path becomes narrow, and the connecting end member 12 made of brass is an expensive member, so that the material cost is increased. There was a problem such as.

  Moreover, since the process of brazing the connection end member 12 to the copper pipe is necessary, the processing cost is high, and if there is a brazed part, it is necessary to inspect whether or not water leakage occurs in that part. In addition to the need for water leakage inspection costs, there is a problem in that the time for forming the connection end side of the pipe line 1 (configuration in which the connection end member 12 is provided) also increases. Furthermore, since brass is heavy, there is a problem in that the parts and the entire product formed by using brass are also heavy, and the transportation cost of the product is high.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a pipe having a simple configuration and an inexpensive inner pipe having a uniform inner diameter larger than the outer diameter of the pipe. It is an object of the present invention to provide a pipe connection structure that can be accurately connected to a connection part, reduce the weight of connected parts, reduce the weight of the product, and reduce the transportation cost of the product.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the present invention is a pipe connection structure for connecting a pipe line to a cylindrical connected portion having an inner diameter larger than the outer diameter of the pipe line and having a uniform inner diameter. Are formed with a first and second projecting portions projecting in the form of a ring on the outer peripheral side of the conduit with an interval in the longitudinal direction of the conduit, and the first projecting portion is the second projecting portion. A ring member is disposed and fixed on the outer peripheral side of the second overhanging portion so as to cover the second overhanging portion, and the connection tip of the pipe line in the ring member A flange projecting outward is formed at the end opposite to the side, and a gap between the end of the ring member on the side opposite to the collar formation side and the first projecting section Is provided with an O-ring on the outer peripheral side of the pipe line, and the ring member from the connecting tip of the pipe line The length to the flange forming position is formed to be equal to or less than the cylinder length of the cylindrical connected portion, and the outer diameter of the first projecting portion and the outer diameter of the ring member are the cylindrical connected portion. The connecting end side of the pipe line is fitted into the cylindrical connected portion, and the flange portion of the ring member is engaged with the distal end portion of the cylindrical connected portion. Therefore, the insertion length of the pipe line into the cylindrical connected part is regulated, and the pipe line is connected to the cylindrical connected part as means for solving the problem.

  According to the present invention, the pipe is connected to a cylindrical connected portion having an inner diameter larger than the outer diameter of the pipe and the inner diameter being uniform. First and second projecting portions projecting in a ring shape are formed on the outer peripheral side of the pipe line with an interval in the longitudinal direction of the pipe, and the first projecting portion is closer to the connecting tip than the second projecting portion. A ring member is disposed and fixed on the outer peripheral side of the second overhanging portion so as to cover the second overhanging portion. In addition, a flange projecting outward is formed at the end of the ring member on the opposite side to the connection distal end side of the pipe line, and the distal end side of the ring member on the side opposite to the flange forming side is formed. An O-ring (for example, made of rubber) is provided between the end portion and the first overhang portion on the outer peripheral side of the pipe line.

  The length from the connecting tip of the pipe line to the collar forming position of the ring member is equal to or less than the length of the cylinder of the cylindrical connected part, and the outer diameter of the first projecting part and the ring member Since the outer diameter is formed to be approximately the same size as the inner diameter of the cylindrical connected portion, the connection end side of the pipe line can be smoothly fitted to the cylindrical connected portion, The insertion length of the pipe line to the cylindrical connected portion is regulated by engaging the flange portion of the ring member with the distal end portion of the cylindrical connected portion, and the cylindrical connected portion has the It is possible to connect the pipe line in a liquid-tight state easily and in a good state.

  That is, according to the present invention, the pipe line and the cylindrical connected part can be connected by simply inserting the pipe line into the cylinder of the cylindrical connected part with the pipe line and the cylindrical connected part facing each other. As described above, it is not necessary to braze an expensive metal connection end member such as brass on the connection end side of the pipe line, and it is possible to prevent the flow path from becoming narrow and to connect an expensive brass Since it is not necessary to provide the end member, the material cost can be reduced, and since the brazing process can be omitted, the processing cost can be reduced. In addition, if there is a brazing part, it is necessary to inspect whether or not water leaks at that part, but this inspection is also unnecessary, and the water leakage inspection cost of the brazing part can be reduced. Furthermore, since brass is heavy, the weight of the entire product increases as much as brass is used. However, such problems can be solved, the weight of the entire product can be reduced, and the transportation cost of the product can be reduced.

  The ring portion can be made of, for example, brass, but the amount thereof is very small compared with the case where the connection end member is provided, so that the weight on the pipe line side becomes significantly heavy by providing the ring portion. In addition, since the liquid-tight connection is maintained by the O-ring, the ring portion only needs to be fixed to the second projecting portion of the pipe line by, for example, caulking, and the processing is very easy. There is no need for brazing and water leak inspection, and the price can be reduced significantly.

It is a typical section explanatory view for explaining one example of the pipe line connection structure concerning the present invention. It is typical perspective explanatory drawing for demonstrating the method of connecting the pipe line to a to-be-connected body by applying the pipe line connection structure of an Example. It is typical sectional drawing for demonstrating the ring part currently applied to the pipe-line connection structure of an Example. It is perspective explanatory drawing which shows the example of the conventional pipe line connection structure typically. It is sectional explanatory drawing which shows the example of the conventional pipe line connection structure typically. It is sectional explanatory drawing which shows the comparative example of a pipe line connection structure typically.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in the description of the present embodiment, the same reference numerals are given to the same name portions as those described so far, and the duplicate description is omitted or simplified.

  FIG. 1 is a schematic cross-sectional view showing an embodiment of a pipe connection structure according to the present invention and a pipe connection method for forming the pipe connection structure. FIG. A schematic perspective view of the state before connection is shown. As shown in FIG. 2, the present embodiment is a pipe connection structure for connecting a copper pipe 1 to a cylindrical connected portion 2 similar to the conventional example, as shown in FIG. 1 (a). Furthermore, in this embodiment, the first and second overhangs projecting in the form of a ring on the outer peripheral side of the pipe line 1 with respect to each other in the longitudinal direction of the pipe line 1 on the connection tip side of the copper pipe line 1 The portions 3 and 4 are formed, and the first overhang portion 3 is formed closer to the connection tip than the second overhang portion 4.

  A brass ring member 5 is disposed and fixed by caulking on the outer peripheral side of the second overhanging portion 2 so as to cover the second overhanging portion 4, and the pipe 1 is connected to the ring member 5. A flange 8 projecting outward is formed at the end opposite to the tip side. A rubber such as EPDM (ethylene / propylene / diene rubber) is provided on the outer peripheral side of the pipe line 1 between the end of the ring member 5 on the side opposite to the formation side of the flange 8 and the first projecting portion 3. A made O-ring 6 is provided. In FIG. 2, the O-ring 6 is not shown, and the brass parts are hatched, and the stainless parts (clip 13) are dotted.

  The length from the connection tip of the pipe line 1 to the formation position of the flange part 8 of the ring member 5 is formed to be equal to or shorter than the cylinder length of the cylindrical connected part 2 of the connected body 10 (here, less than the length of the cylinder) In addition, the outer diameter of the first overhanging portion 3 of the pipe line 1 and the outer diameter of the ring member 5 are formed to be approximately the same as the inner diameter of the cylindrical connected portion 2. Then, as shown in FIG. 1B, the connecting end side of the pipe line 1 is fitted into the cylindrical connected portion 2, and the flange portion 8 of the ring member 5 is connected to the tip end portion (鍔) of the cylindrical connected portion 2. By engaging with the cylindrical part 18), the insertion length of the pipe line 1 into the cylindrical connected part 2 is restricted, and the pipe line 1 is connected to the cylindrical connected part 2.

  With this connection, in this embodiment, in the portion S of FIG. 1C, that is, the outer peripheral side of the ring member 5 and the tip portion of the first overhanging portion 3 are in contact with the inner wall of the cylindrical connecting portion 2 or The pipe line is substantially contacted (for example, a contact in a fitting tolerance insertion state defined by the JIS standard, such as a slight fitting tolerance insertion state that does not hinder the insertion of the pipe line 1 into the cylindrical connecting portion 2). 1 is connected to the body to be connected 10, and the contact (substantially contact) length Sa between the ring member 5 and the cylindrical connection portion 2 is the length indicated by A in FIG. 3 (FIG. 1B). (C), FIG. 3 also shows the gaps not shown).

  In FIG. 1C, in order to make the drawing easy to understand, the region indicated by S is shown as a thick line and only the upper half side of the cross section is shown, but the region indicated by S is the pipe line 1. In this circumferential direction, the inner wall side of the cylindrical connecting portion 2 is contacted or substantially contacted, and the actual connection state is as shown in FIG. After the connection, as shown in FIG. 2, the connection portion is fixed using the clip 13 or the like.

  Further, the ring member 5 is caulked and fixed to the second overhanging portion 4, thereby forming a deformed portion deformed by the second overhanging portion 4 on the inside as shown in FIG. 3. The length A from the reference position to the tip of the ring member 5 is formed to be much longer than the length B from the reference position to the rear end of the ring member 5 with the center of the deformed portion as a reference. ing. And, since the length A is formed long, the pipe line 1 is inserted into the cylindrical connection part 2 without shaking when inserted into the cylindrical connection part 2, and fixed without shaking, By forming the length B short, the total amount of the expensive brass ring members 5 can be reduced as much as possible, and the cost can be reduced.

  FIG. 6 shows a comparative example of the pipe connection structure. In this structure, the pipe 1 side and the cylindrical connection part 2 side are in contact with each other at three locations indicated by S in the figure (or (In FIG. 6, in order to make the figure easy to understand, the contact area S is indicated by a bold line only on the upper side of the figure. The region is in a mode of contacting the inner wall side of the cylindrical connecting portion 2 in the circumferential direction of the pipe line 1). The configuration shown in FIG. 6 makes the contact portion Sc between the distal end side of the pipe line 1 and the cylindrical connection part 2 by making the front end side of the pipe line 1 long and providing a step on the cylindrical connection part 2 side. However, in such a configuration, the structure of the mold for forming the conduit 1 and the structure of the mold for forming the cylindrical connecting portion 2 are complicated. Because it is difficult to manufacture, it leads to cost increase.

  On the other hand, in this embodiment, the pipe line 1 and the cylindrical connecting portion 2 are in contact (or substantially in contact) in the two regions S as shown in FIG. Thus, unlike the comparative example, a complicated configuration is not required in which the distal end side of the pipe line 1 is lengthened and a step is provided on the cylindrical connecting portion 2 side. That is, in this embodiment, the length of the ring member 5 is such that the length of Sa in FIG. 1 (c) is set to the length of Sb + Sc in FIG. 6 without providing a component part that needs to form a complicated mold. It is possible to form a pipe connection structure that can reliably prevent shaking with a simple configuration that only increases the length. That is, the present embodiment is a pipe connection structure that is very simple and can be reduced in cost by making the structure of the ring member 5 characteristic, and mass production can be facilitated.

  In the pipe connection structure, the reason why the anti-vibration is necessary is that the length of the pipe 1 is long, so that if the pipe 1 is inclined even a little and is connected to the cylindrical connecting portion 2, the connection side This is because the position of the pipe line 1 on the opposite side may greatly deviate and various problems may occur. For example, when the pipe line 1 is a water pipe or the like, dew condensation may occur around the pipe line 1 and it may be necessary to provide a structure for receiving water droplets due to the dew condensation. Considering that the position where the water droplets are dropped due to the displacement, the range in which the water droplet receiver is provided must be widened. Moreover, when the heater is provided in the pipe line 1, the heater line may come into contact with the edge of the clip 13 and break. In order to suppress the occurrence of such a problem, it is important that the pipe line 1 is inserted into the cylindrical connecting portion 2 without shaking and is fixed without shaking.

  According to the present embodiment, as described above, the pipe line 1 can be inserted and fitted straight without being shaken into the cylinder of the cylindrical connection portion 2, so that the O-ring 6 provided on the connection end side of the pipe line 1 is provided. The pipe 1 can be inserted smoothly into the cylinder of the cylindrical connecting portion 2 without being damaged, and the pipe 1 can be inserted into the cylinder 1 in a good state easily and without shaking. The connection part 2 can be connected in a liquid-tight manner. Moreover, since it is not necessary to provide the connecting end member 12 made of brass as in the conventional example, the above-described various problems caused by providing the connecting end member 12 made of brass can be solved.

  In addition, this invention is not limited to the said Example, A various aspect can be taken in the range which does not deviate from the technical scope of this invention. For example, the O-ring 6 may be made of rubber other than EPDM, as long as it has elasticity and can connect the pipe line 1 to the cylindrical connection portion 2 in a liquid-tight (or air-tight) manner.

  In addition, the pipe connection structure of the present invention may be applied to a heat source device other than the water heater, may be applied to other than the heat source device, and is limited to a method for connecting pipes through which a liquid such as a water pipe passes. Alternatively, the present invention may be applied to a method of connecting pipe lines through which gas such as a gas pipe passes.

  Furthermore, the pipe line 1 is not limited to copper but may be made of aluminum or stainless steel, and the ring member 5 can also be formed of, for example, resin or ceramic other than brass.

  The present invention can easily and inexpensively connect a pipe line to a cylindrical connection part having an inner diameter larger than the outer diameter of the pipe line and a uniform inner diameter. Applicable to any heat source device.

DESCRIPTION OF SYMBOLS 1 Pipe line 2 Cylindrical to-be-connected part 3 1st overhang | projection part 4 2nd overhang | projection part 5 Ring member 6 O-ring 8 collar part

Claims (1)

  A pipe connection structure for connecting a pipe line to a cylindrical connected portion having an inner diameter larger than the outer diameter of the pipe line and having a uniform inner diameter. First and second projecting portions projecting in a ring shape are formed on the outer peripheral side of the pipe line with an interval in the longitudinal direction, and the first projecting portion is closer to the connection tip than the second projecting portion. A ring member is formed and fixed on the outer peripheral side of the second overhanging portion so as to cover the second overhanging portion, and the end of the ring member on the opposite side to the connecting tip end side of the pipe line A flange portion projecting outward is formed on the portion, and the end of the ring member on the side opposite to the collar portion forming side is between the end portion of the ring member and the first projection portion. An O-ring is provided on the outer peripheral side, from the connecting tip of the pipe line to the flange forming position of the ring member Is formed to be equal to or less than the length of the cylinder of the cylindrical connected portion, and the outer diameter of the first overhanging portion and the outer diameter of the ring member are substantially the same as the inner diameter of the cylindrical connected portion. The tube is connected to the cylindrical connected portion, and the flange portion of the ring member is engaged with the distal end portion of the cylindrical connected portion. A pipe connection structure, characterized in that an insertion length to a cylindrical connected part is regulated and the pipe is connected to the cylindrical connected part.

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