JP3198572U - Piping connection structure - Google Patents

Abstract

Provided is a pipe connection structure capable of connecting a vacuum double pipe having a simple structure and an excellent heat insulating effect. An inner tube 11 through which a liquid can flow and an outer tube 12 provided on the outer periphery of the inner tube 11 and covering the inner tube 11 are provided, and a vacuum is formed between the inner tube 11 and the outer tube 12. A pipe constituted by a plurality of double pipes 13 that can be held together and a joint 14 that can connect a pair of double pipes 13, 13 among the plurality of double pipes 13, 13. In the connection structure 10, the joint 14 includes a connecting portion 15 that can connect the inner pipes 11 and 11 constituting a pair of double pipes 13 and 13 to be connected to each other, and the connecting portion 15 is connected to the double pipe 13. , 13 and a fixing portion 16 that can be fixed along the radial direction. [Selection] Figure 1

Description

  The present invention relates to a pipe connection structure, and more particularly to a double pipe connection structure having an inner pipe and an outer pipe.

In general, in order to circulate a fluid having a large temperature difference from the outside air temperature while maintaining a constant temperature, the fluid includes an inner tube for circulating the fluid therein and an outer tube covering the inner tube, and the inner tube and the A vacuum double pipe that prevents heat conduction and convection by making a vacuum with the outer pipe is known.
There are roughly two types of vacuum double pipes. One is a vacuum double pipe having a structure for connecting the inner pipes and the outer pipes at the connection part between the pipe and the pipe, respectively, and the other is at the end of the inner pipe. This is a vacuum double pipe having a structure in which the outer tube is sealed to maintain a vacuum and the inner tube is connected only at the connecting portion.

While the former vacuum double pipe is excellent in the heat insulating effect of the connection part, it was necessary to evacuate the space between the inner pipe and the outer pipe after connecting all the double pipes. .
Therefore, in order to reduce the labor of exhausting to vacuum, for example, in Patent Documents 1 and 2, the inner tube is covered by the outer tube, and an exhaust passage is formed by the space between the inner tube and the outer tube, In the extending direction of the inner pipe, the exhaust passage is opened at both end portions, and the exhaust passage of one vacuum double pipe is evacuated to a vacuum, thereby a joint connected to the vacuum double pipe, etc. A vacuum double pipe capable of evacuating other vacuum double pipes connected via these to a vacuum, and a connection structure thereof are disclosed.

  However, in Patent Documents 1 and 2, since maintenance can be performed only after all piping is once released to the atmosphere in maintenance, considerable work time is spent on re-evacuation at the time of restoration. There was a problem that the operating rate was lowered.

In addition, the latter vacuum double pipe has the merit that maintenance is easy because the space between the inner pipe and the outer pipe is maintained independently for each pipe, so that the connection part is easy. Since it is a single pipe with only an inner pipe, the heat insulation effect is inferior to that of the former vacuum double pipe.
In order to reduce this demerit, it is necessary to bring the sealing part where the outer pipe is sealed as close as possible to the end of the pipe and minimize the part that is a single pipe. However, since a joint used for a general flange is used by fixing with a fixing tool such as a bolt and a nut along the length direction of the pipe, the fixing tool is a sealing portion of the outer pipe. There was a problem of interfering with.

  Further, in order to increase the heat insulation effect in the vacuum double pipe, it is necessary to increase the difference between the diameter dimension of the inner pipe and the diameter dimension of the outer pipe. There is a problem in that the fixture protrudes in the outer peripheral direction, and the fixture interferes with the sealing portion of the outer tube.

Further, for example, Patent Document 3 discloses a joint in which the heat insulating effect of the connection portion is enhanced by providing a vacuum portion in the joint, but the structure of the joint becomes complicated and the connection portion is the outer periphery of the outer tube. Due to the structure that protrudes greatly in the direction, there were other problems such as high manufacturing costs and limited installation locations.
JP 2011-208665 A JP 2011-208667 A Japanese Utility Model Publication No. 62-114292

  The present invention is for solving the conventional problems as described above, and the problem is a pipe connection structure that can connect a vacuum double pipe having a simple structure but excellent heat insulation effect. It is to provide.

  In order to solve the above problems, the device according to claim 1 has an inner tube through which a liquid can flow and an outer tube provided on the outer periphery of the inner tube and covering the inner tube. A plurality of double pipes capable of maintaining a vacuum between the inner pipe and the outer pipe, and a joint capable of connecting a set of double pipes to be connected among the plurality of double pipes. A pipe connection structure configured, wherein the joint includes a connecting part that can connect the inner pipes constituting the pair of double pipes to be connected to each other, and the connecting part is a radial direction of the double pipe. And a fixing portion that can be fixed along the line.

  Therefore, the inner pipes constituting the pair of double pipes to be connected are connected to each other by the connecting part and fixed along the radial direction of the double pipe by the fixing part.

  In the invention according to claim 2, the connecting portion is constituted by a seal ring portion sandwiched between end portions of inner pipes constituting the pair of double pipes to be connected, and the pair The inner pipes can be connected in a liquid-tight state.

  Therefore, the seal ring portion is sandwiched between end portions of the inner pipes constituting the set of double pipes to be connected, and the set of inner pipes are connected in a liquid-tight state.

  According to a third aspect of the present invention, the fixing portion is formed in an arc shape so as to be connectable to each other, and includes a plurality of fixing piece portions that can cover an outer periphery of the seal ring portion, and the plurality of fixing piece portions. It is connected to each other, and the seal ring portion is constituted by a coupling portion that can be pressed against an end portion of the set of inner pipes.

  Therefore, when the plurality of fixed pieces cover the outer periphery of the seal ring part and are connected to each other, the seal ring part is covered with the plurality of fixed pieces, and the coupling part Each is pressed against the end of a set of inner tubes.

  In the device according to claim 4, the outer tube is sealed at the end of the inner tube, and a sealed end that can hold a vacuum between the inner tube and the outer tube. It is provided along the radial direction.

  Therefore, a vacuum between the inner tube and the outer tube is maintained by the sealed end.

  In the invention according to claim 5, the outer peripheral surface portion of the inner tube is provided with a protrusion that abuts on the inner peripheral surface portion of the outer tube and can maintain a distance between the inner tube and the outer tube. It is characterized by being.

  Therefore, the interval between the inner tube and the outer tube is held by the protrusion.

The pipe connection structure according to any one of claims 1 to 4, wherein inner pipes constituting the pair of double pipes to be connected are connected to each other by the connecting part, and the two parts are connected by the fixing part. Since it is fixed along the radial direction of the heavy pipe, it is possible to prevent a situation where the portion where the outer pipe is sealed interferes with the joint.
Therefore, the portion where the outer tube is sealed can be as close as possible to the end of the inner tube to which the joint is connected. As a result, it is possible to provide a pipe connection structure having a high heat insulating effect.
Further, even when the difference between the inner tube diameter and the outer tube diameter is increased, the portion where the outer tube is sealed does not interfere with the joint, thus further enhancing the heat insulating effect. be able to.

The pipe connection structure according to claim 2 or 3, wherein the seal ring portion is sandwiched between ends of inner pipes constituting the pair of double pipes to be connected, Since the pipes are connected in a liquid-tight state, the double pipe can be easily connected.
In particular, in the pipe connection structure according to claim 3, when the plurality of fixed pieces cover the outer periphery of the seal ring part and are connected to each other, the seal ring part is The fixed pieces are covered with each other, and are pressed against the ends of the set of inner pipes by the coupling part, so that the plurality of fixed pieces can more reliably connect the double pipe. .
As a result, it is possible to provide a pipe connection structure that allows simple and reliable connection of double pipes.

In the pipe connection structure according to claim 4, since the vacuum between the inner pipe and the outer pipe is held by the sealing end portion, A vacuum can be maintained between the outer tube.
As a result, it is possible to provide a pipe connection structure that does not require any vacuum for pipe connection.
Moreover, since the sealing end portion is provided along the radial direction at the end portion of the inner tube, it is possible to prevent a situation where the sealing end portion interferes with the joint that can connect the inner tube along the radial direction. it can. Therefore, the sealing end can be brought as close as possible to the end of the inner pipe to which the joint is connected, and the heat insulation effect can be enhanced.
Further, even when the difference between the diameter of the inner tube and the diameter of the outer tube is increased, the sealed end portion can be prevented from interfering with the joint, and further the heat insulating effect Can be increased.

In the pipe connection structure according to claim 5, since the interval between the inner pipe and the outer pipe is held by the protrusion, the heat insulating effect can be made uniform along the circumferential direction. .
Further, in the case of producing the double pipe by covering and welding the inner pipe with the outer pipe, the outer pipe is arranged so as to be in contact with a protrusion provided on the inner pipe and welded. By doing so, the distance between the inner tube and the outer tube can be kept uniform along the circumferential direction for welding.
As a result, it is possible to provide a pipe connection structure having a double pipe whose heat insulating effect is uniform along the circumferential direction.

FIG. 1 is a perspective view showing an embodiment of a pipe connection structure according to the present invention. FIG. 2 is a cross-sectional view corresponding to the line AA in FIG. 1 in the embodiment of the pipe connection structure according to the present invention. FIG. 3 is an exploded perspective view showing a state in which the outer pipe of the pipe is removed in the embodiment of the pipe connection structure according to the present invention.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIG. 1, a pipe connection structure 10 according to an embodiment of the present invention includes an inner pipe 11 through which a liquid can circulate, and an outer pipe that is provided on the outer periphery of the inner pipe 11 and can cover the inner pipe 11. A plurality of double pipes 13, 13... And a plurality of double pipes 13, 13... That can hold a vacuum between the inner pipe 11 and the outer pipe 12. It is comprised by the coupling 14 which can connect one set of double piping 13 and 13 which should be connected.

  As shown in FIG. 1, the joint 14 according to the present embodiment includes a connecting portion 15 that can connect the inner pipes 11 and 11 constituting the pair of double pipes 13 and 13 to be connected to each other, It has the fixing | fixed part 16 which can fix the part 15 along the radial direction of the double piping 13. As shown in FIG.

  Moreover, as shown in FIG.1 and FIG.2, the connection part 15 which concerns on this Embodiment is between the edge parts 17 and 17 of the inner pipes 11 and 11 which comprise one set of double piping 13 and 13 which should be connected. A pair of inner pipes 11 and 11 can be connected in a liquid-tight state by a seal ring portion 18 held between them.

  Further, as shown in FIG. 1, the fixing portion 16 according to the present embodiment is formed in an arc shape so as to be connectable to each other, and a pair of fixing piece portions 19, 19 that can cover the outer periphery of the seal ring portion 18, and a pair The fixed piece portions 19 and 19 are connected to each other, and the seal ring portion 18 is constituted by coupling portions 20 and 20 that can press the end portions 17 and 17 of the pair of inner tubes 11 and 11 respectively.

As shown in FIGS. 1 and 3, the outer tube 12 is sealed at the end 17 of the inner tube 11 according to the present embodiment, and a vacuum is maintained between the inner tube 11 and the outer tube 12. A possible sealing end 21 is provided along the radial direction.
Further, as shown in FIG. 3, the outer peripheral surface portion 22 of the inner tube 11 according to the present embodiment is in contact with the inner peripheral surface portion 23 of the outer tube 12 to maintain the distance between the inner tube 11 and the outer tube 12. Protruding projections 24, 24... Are provided.

The configuration of the piping connection structure 10 according to the present embodiment will be described in more detail with reference to the accompanying drawings.
As shown in FIG. 1, the coupling portions 20, 20 according to the present embodiment are screwed together via the hole portions 25, 25 opened at the end of the fixed piece portion 19, and the hole portions 25, 25. A pair of fixing pieces 19 and 19 are constituted by bolts 26 and 26 and nuts 27 and 27 that can be coupled to each other.

Moreover, as shown in FIG.1 and FIG.2, it arrange | positions at the edge parts 17 and 17 in the state by which the inner pipes 11 and 11 were faced | matched by the inner peripheral surface of the fixed piece parts 19 and 19 which concern on this Embodiment. Ring storage recesses 28 and 28 for storing the seal ring portion 18 are formed respectively. Further, as shown in FIGS. 1 and 2, pipe engaging portions 29 and 29 capable of fixing the seal ring portion 18 accommodated in the ring accommodating recess 28 are formed on both sides of the ring accommodating recess 28 in the axial direction. ing.
Further, as shown in FIG. 1, the inner pipes 11, 11 according to the present embodiment are separated from the end portion 17 by a predetermined dimension in the axial direction, and the pipe engaging portions 29, 29 of the fixed piece portions 19, 19. Are formed along the circumferential direction of the inner tubes 11, 11, respectively.

Hereinafter, the operation of the pipe connection structure 10 according to the present embodiment will be described with reference to the accompanying drawings.
As shown in FIG. 1, the pipe connection structure 10 according to the present embodiment uses a pair of double pipes 13 and 13 to be connected with a joint 14.
Specifically, as shown in FIG. 1, after the inner tubes 11 and 11 are abutted so that the seal ring portion 18 is sandwiched between the end portions 17 and 17 of the inner tubes 11 and 11, The end portions 17 and 17 and the seal ring portion 18 are covered with a pair of fixed piece portions 19 and 19.
At this time, the seal ring portion 18 is housed in a ring housing recess 28 provided in the pair of fixed pieces 19 and 19.

Then, as shown in FIG. 1, bolts 26 and 26 and nuts 27 and 27 are screwed together through holes 25 and 25 provided in the pair of fixed pieces 19 and 19, respectively.
At this time, as shown in FIG. 2, the seal ring portion 18 housed in the ring housing recess 28 is brought into pressure contact with the end portions 17, 17 of the pair of inner tubes 11, 11. The end portions 17 and 17 are sealed in a liquid-tight state, and the pipe engaging portions 29 and 29 of the pair of fixed piece portions 19 and 19 are groove portions 30 provided in the end portions 17 and 17 of the inner tubes 11 and 11. By being pressed against 30, a pair of double pipes 13 and 13 are connected.

As described above, as shown in FIG. 1, in the pipe connection structure 10 according to the present embodiment, the inner pipes 11, 11 constituting the pair of double pipes 13, 13 to be connected are seal rings. Are connected to each other by the connecting portion 15 constituted by the portion 18 and fixed along the radial direction of the double pipes 13 and 13 by the fixing portion 16 constituted by the pair of fixing piece portions 19 and 19. It is possible to prevent the stop end 21 from interfering with the joint 14.
In particular, as shown in FIG. 1, the sealing end 21 according to the present embodiment is provided along the radial direction at the end 17 of the inner tube 11, so that the inner tube 11 is connected along the radial direction. It is possible to reliably prevent a situation such as interference with the possible joint 14. Therefore, the sealing end 21 can be brought as close as possible to the end 17 of the inner tube 11 to which the joint 14 is connected, and the heat insulation effect can be enhanced.
Further, as shown in FIG. 1, even if the difference between the diameter dimension of the inner tube 11 and the diameter dimension L of the outer tube 12 is increased, the situation where the sealed end 21 interferes with the joint 14 is prevented. It is possible to further increase the heat insulation effect.

Further, as shown in FIG. 1, in the double pipe 13 according to the present embodiment, the vacuum between the inner pipe 11 and the outer pipe 12 is held by the sealed end portion 21. A vacuum between the inner pipe 11 and the outer pipe 12 can be maintained for each of the heavy pipes 13, 13.
As a result, it is possible to provide a pipe connection structure that does not require any vacuum for pipe connection.

As shown in FIG. 1, in the pipe connection structure 10 according to the present embodiment, the inner pipes 11, 11 constituting a pair of double pipes 13, 13 to which the seal ring portion 18 should be connected. Since the pair of inner pipes 11 and 11 are connected in a liquid-tight state, the double pipes 13 and 13 can be easily connected.
In particular, as shown in FIGS. 1 and 2, in the pipe connection structure 10 according to the present embodiment, the pair of fixed pieces 19 and 19 cover the outer periphery of the seal ring portion 18 and are connected to each other. In this case, the seal ring portion 18 is covered with a pair of fixed piece portions 19 and 19 and pressed against the end portions 17 and 17 of the pair of inner tubes 11 and 11 by the coupling portions 20 and 20, respectively. Therefore, the double pipe can be more reliably connected by the pair of fixed pieces 19 and 19.
As a result, it is possible to provide a pipe connection structure that allows simple and reliable connection of double pipes.

3, in the piping connection structure 10 according to the present embodiment, the interval between the inner tube 11 and the outer tube 12 is held by the protrusions 24, 24. The heat insulation effect can be made uniform along the circumferential direction.
3, when the double pipe 13 is produced by covering and welding the inner pipe 11 with the outer pipe 12, the protrusions 24, 24... Provided on the inner pipe 11 are formed. By arranging and welding the outer tube 12 so as to abut, it is possible to perform welding while keeping the distance between the inner tube 11 and the outer tube 12 uniform along the circumferential direction.
As a result, it is possible to provide a pipe connection structure having a double pipe whose heat insulating effect is uniform along the circumferential direction.

  The connecting portion 15 according to the present embodiment includes a pair of seal ring portions 18 sandwiched between the end portions 17 and 17 of the inner pipes 11 and 11 constituting the pair of double pipes 13 and 13 to be connected. Although the case where it was comprised so that the inner pipes 11 and 11 could be connected in a liquid-tight state was demonstrated to the example, it is not limited to the said structure.

  The fixing portion 16 according to the present embodiment is formed in an arc shape so as to be connectable to each other, and a pair of fixing piece portions 19 and 19 that can cover the outer periphery of the seal ring portion 18 and a pair of fixing piece portions 19 and 19. Are connected to each other, and the seal ring portion 18 is described as an example of the case where the seal ring portion 18 is configured by the coupling portions 20 and 20 that can be pressed against the end portions 17 and 17 of the pair of inner pipes 11 and 11, respectively. It is not limited to the configuration.

  Further, the outer tube 12 is sealed at the end 17 of the inner tube 11 according to the present embodiment, and the sealed end 21 capable of maintaining a vacuum between the inner tube 11 and the outer tube 12 is in the radial direction. Is provided on the outer peripheral surface portion 22 of the inner tube 11 according to the present embodiment, and is in contact with the inner peripheral surface portion 23 of the outer tube 12 so as to maintain a distance between the inner tube 11 and the outer tube 12. Although the case where 24, 24.

  The present invention is widely applicable to pipe connection structures and has industrial applicability.

10: Piping connection structure 11: Inner pipe 12: Outer pipe 13: Double pipe 14: Joint 15: Connection part 16: Fixing part 17: End part 18: Seal ring part 19: Fixed piece part 20: Coupling part 21: Sealing end portion 22: Outer peripheral surface portion 23: Inner peripheral surface portion 24: Protruding portion 25: Hole portion 26: Bolt 27: Nut 28: Ring housing recess 29: Pipe engaging portion 30: Groove L: Between the inner tube and the outer tube Difference in diameter

Claims (5)

A plurality of inner tubes that can be circulated, and an outer tube that is provided on an outer periphery of the inner tube and that covers the inner tube, and that can maintain a vacuum between the inner tube and the outer tube. A pipe connection structure constituted by a double pipe and a joint capable of connecting a pair of double pipes to be connected among the plurality of double pipes,
The joint has a connecting part that can connect the inner pipes that constitute the pair of double pipes to be connected to each other, and a fixing part that can fix the connecting parts along the radial direction of the double pipe. A piping connection structure characterized by that.   The connecting portion is constituted by a seal ring portion sandwiched between end portions of inner pipes constituting the set of double pipes to be connected, and the set of inner pipes can be connected in a liquid-tight state. The pipe connection structure according to claim 1.   The fixing part is formed in an arc shape so as to be connectable to each other, and connects the plurality of fixing piece parts that can cover the outer periphery of the seal ring part, the plurality of fixing piece parts to each other, and the seal ring part 3. The pipe connection structure according to claim 2, wherein each of the inner pipes is constituted by a connecting portion that can be pressed against the end portion of the inner pipe.   The outer tube is sealed at the end of the inner tube, and a sealed end capable of maintaining a vacuum between the inner tube and the outer tube is provided along the radial direction. The piping connection structure according to claim 1. The outer peripheral surface portion of the inner tube is provided with a protrusion that abuts on the inner peripheral surface portion of the outer tube and can maintain a distance between the inner tube and the outer tube. Piping connection structure.