Telescopic joint assembly, and heat exchanger

Abstract

This reduces the occurrence of malfunctions due to damage to the expansion joint assembly. [Solution] An expansion joint assembly according to at least one embodiment of the present disclosure includes a bellows formed to be expandable and contractible, and includes a first tubular member extending in a vertical direction, a second tubular member extending in a vertical direction and disposed on the inner periphery of the first tubular member, and a plurality of inner protrusions provided on the first tubular member below the second tubular member at intervals in the circumferential direction and protruding radially inward. The radially inner ends of the inner protrusions are located radially inward of a portion of the second tubular member that has the largest radial dimension.

Description

[Technical field]

[0001] The present disclosure relates to an expansion joint assembly and a heat exchanger. [Background technology]

[0002] For example, an expansion joint including a bellows shaped like a bellows that is expandable and contractible is used to absorb changes in the relative position between a mating member to which one end of the expansion joint is connected and a mating member to which the other end is connected. In such an expansion joint, a protective tube is sometimes provided to protect the bellows tube from the fluid flowing inside the bellows tube (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 62-2885 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the function of fixing the protective tube is impaired for some reason, there is a risk that the protective tube will come off the expansion joint together with the flow of the fluid or due to the influence of gravity.

[0005] In view of the above circumstances, at least one embodiment of the present disclosure has an object to reduce the occurrence of malfunctions due to damage to an expansion joint assembly. [Means for solving the problem]

[0006] (1) An expansion joint assembly according to at least one embodiment of the present disclosure includes: A first cylindrical member including a bellows formed to be expandable and contractible and extending in the vertical direction; a second cylindrical member disposed on an inner peripheral side of the first cylindrical member and extending in a vertical direction; a plurality of inner protrusions provided on the first cylindrical member at intervals in the circumferential direction below the second cylindrical member and protruding radially inward; Equipped with The radially inner ends of the multiple inner protrusions are located radially inner than a portion of the second tubular member that has the largest radial dimension.

[0007] (2) At least one embodiment of the heat exchanger according to the present disclosure comprises: A heat exchanger for exchanging heat between a first fluid and a second fluid, a first nozzle for allowing the first fluid to flow into the heat exchanger; a second nozzle for causing the first fluid to flow out of the heat exchanger; Equipped with At least one of the first nozzle and the second nozzle is provided therein with the expansion joint assembly having the above configuration (1). Effect of the Invention

[0008] According to at least one embodiment of the present disclosure, the occurrence of malfunctions due to damage to the expansion joint assembly can be reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram showing the appearance of a heat exchanger as an example of an apparatus to which an expansion joint assembly according to an embodiment is applied. [Diagram 2] FIG. 2 is a schematic cross-sectional view of a nozzle of a heat exchanger. [Diagram 3] FIG. 3 is an enlarged view of part A in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," are intended to not only express such a configuration strictly, but also to express a state in which there is a relative displacement with a tolerance or an angle or distance to an extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions excluding the presence of other elements.

[0011] FIG. 1 is a diagram showing the external appearance of a heat exchanger as an example of an apparatus to which an expansion joint assembly according to an embodiment is applied. FIG. 2 is a schematic diagram showing a cross section of a nozzle of a heat exchanger. FIG. 3 is an enlarged view of part A in FIG. A heat exchanger 1 as an example of an apparatus to which an expansion joint assembly according to one embodiment is applied is, for example, a multi-tube heat exchanger, and has a cylindrical body 11 and a heat transfer tube group 13 including a plurality of heat transfer tubes 12 arranged inside the body 11, and is configured to be able to exchange heat between a fluid flowing outside each heat transfer tube 12 and a fluid flowing inside each heat transfer tube 12. The heat exchanger 1 is equipped with a first nozzle 21 for allowing a fluid (first fluid) flowing outside each heat transfer tube 12 to flow into the interior of the heat exchanger 1, a second nozzle 22 for allowing the first fluid to flow out to the outside of the heat exchanger 1, a third nozzle 23 for allowing a fluid (second fluid) flowing inside each heat transfer tube 12 to flow into the interior of the heat exchanger 1, and a fourth nozzle 24 for allowing the second fluid to flow out to the outside of the heat exchanger 1. It is assumed that the first nozzle 21 is attached to the lower half of the body 11, and the second nozzle 22 is attached to the upper half of the body 11.

[0012] The heat exchanger 1 according to one embodiment has an inner cylinder 15, which is a sealed cylindrical container disposed inside a body 11 and covers the outside of a heat transfer tube group 13. In the heat exchanger 1 according to one embodiment, a first fluid flowing outside each heat transfer tube 12 flows inside the inner cylinder 15. Therefore, the first nozzle 21 and the second nozzle 22 are in communication with the inside of the inner cylinder 15.

[0013] In the heat exchanger 1 according to one embodiment, a temperature distribution occurs in the body 11, and a temperature distribution also occurs in the inner cylinder 15, so that the body 11 and the inner cylinder 15 are deformed in different states due to heat. The first nozzle 21 and the second nozzle 22 are fixed (joined) to the body 11 by, for example, welding, but must also be connected to the inner cylinder 15 since they must communicate with the inside of the inner cylinder 15. However, as described above, the body 11 and the inner cylinder 15 are deformed differently due to heat, so it is necessary to make it possible to change the relative positions of the part of the first nozzle 21 and the second nozzle 22 that is connected to the body 11 and the part that is connected to the inner cylinder 15.

[0014] Therefore, in the heat exchanger 1 according to one embodiment, an expansion joint assembly is provided between the portion connected to the body 11 and the portion connected to the inner cylinder 15 in the first nozzle 21 and the second nozzle 22, making it possible to change the relative positions of both portions. Hereinafter, the structure of the expansion joint assembly according to one embodiment provided in the second nozzle 22 will be described mainly with reference to Figs. 2 and 3. For ease of explanation, in the following explanation, the circumferential direction centered on the central axis AX of the nozzle body 31 described later will also be simply referred to as the circumferential direction, and the radial direction centered on the central axis AX will also be simply referred to as the radial direction. Note that the nozzle body 31 extends in the vertical direction at the top of the trunk 11. Therefore, the axial direction, which is the extension direction of the central axis AX of the nozzle body 31, is the vertical direction. In the following description, the lower side in the vertical direction will also be simply referred to as the lower side, and the upper side in the vertical direction will also be simply referred to as the upper side.

[0015] As shown in FIG. 2, the second nozzle 22 has a tubular nozzle body 31 whose lower end is attached to the body 11 and through which a fluid can flow, and an expansion joint assembly 50 according to one embodiment arranged on the inner periphery of the nozzle body 31. An expansion joint assembly 50 according to one embodiment comprises a first tubular member 51 including a bellows 56 in the shape of a bellows tube formed to be expandable and contractible, a second tubular member 52 arranged on the inner circumferential side of the first tubular member 51, and a plurality of inner protrusions 53 provided on the first tubular member 51 below the second tubular member 52 and spaced apart circumferentially, and protruding radially inward. The first fluid flows vertically from the lower side to the upper side inside the second nozzle 22 as indicated by arrow F in FIG.

[0016] In one embodiment of the expansion joint assembly 50, the first tubular member 51 includes a lower annular member 54 connected to the lower end of the bellows 56 and an upper annular member 55 connected to the upper end of the bellows 56. The multiple inner protrusions 53 are provided so as to protrude radially inward from an inner circumferential surface 54i of the lower annular member 54. The inner protrusion 53 can be provided, for example, by joining a relatively small piece by welding or the like to the inner circumferential surface 54i of the lower annular member 54. In the example shown in Fig. 3, the inner protrusion 53 is joined to the inner circumferential surface 54i of the lower annular member 54 by a weld 71. It is preferable that two or three inner protrusions 53 are provided at equal intervals in the circumferential direction. Four or more inner protrusions 53 may be provided, but a smaller number of inner protrusions 53 is preferable because the pressure loss of the fluid flowing inside the expansion joint assembly 50 due to the inner protrusions 53 is reduced.

[0017] In the expansion joint assembly 50 according to one embodiment, the upper annular member 55 is fixed to the inner circumferential surface 31i of the nozzle body 31 directly or via an annular member 58 as shown in FIG. In the expansion joint assembly 50 according to one embodiment, the lower end 54d of the lower annular member 54 is fixed to the inner tube 15 in a state where it is inserted into a through hole 16 formed in the inner tube 15, which is the mating member to which the lower annular member 54 is fixed. In the expansion joint assembly 50 according to one embodiment, the nozzle body 31, the member 58, the upper annular member 55, the bellows 56, the lower annular member 54, and the second tubular member 52 are arranged concentrically about the central axis AX.

[0018] The expansion joint assembly 50 according to one embodiment includes an outer protrusion 57 that is provided around the entire outer circumferential surface 54o of the lower annular member 54 and protrudes radially outward. The outer protrusion 57 is provided by joining a ring-shaped member to the outer circumferential surface 54o of the lower annular member 54 by a weld 72, for example, as shown in FIG. The outer protrusion 57 is located above the through hole 16 of the inner cylinder 15. More specifically, the outer protrusion 57 is in contact with the outer peripheral surface 15o of the inner cylinder 15. The outer diameter of the outer protrusion 57 is larger than the inner diameter of the through hole 16. As a result, the outer protrusion 57 cannot enter the through hole 16 of the inner cylinder 15, and the downward movement range of the lower annular member 54 relative to the inner cylinder 15 is restricted by the outer protrusion 57. As a result, when the lower end portion 54d of the lower annular member 54 is inserted into the through hole 16 of the inner cylinder 15 during installation of the expansion joint assembly 50, it becomes easy to position the lower annular member 54 in the height direction relative to the inner cylinder 15.

[0019] In the expansion joint assembly 50 according to one embodiment, the lower end 54d of the lower annular member 54 is joined to the inner cylinder 15 by welding with the outer protrusion 57 in contact with the outer circumferential surface 15o of the inner cylinder 15. Specifically, with the lower end 54d inserted into the through hole 16 of the inner cylinder 15, the outer circumferential surface 54o of the lower annular member 54 and the through hole 16 are welded from the inner circumferential surface 15i of the inner cylinder 15, and joined by a weld 73. As a result, when the lower annular member 54 is joined to the inner cylinder 15 by welding, the outer protrusions 57 function as a backing metal, making welding easier.

[0020] In the expansion joint assembly 50 according to one embodiment, the second cylindrical member 52 is a protective tube for protecting the bellows 56 from a fluid flowing inside the bellows 56. The second cylindrical member 52 has a cylindrical portion 521 having a cylindrical shape and an expanded diameter portion 522 formed in a lower region of the second cylindrical member 52 so that the diameter gradually increases toward the lower side. The expanded diameter portion 522, which is the lower region of the second cylindrical member 52, is formed in such a shape in order to join the lower end 52d to the inner circumferential surface 54i of the lower annular member 54 while ensuring a radial gap between the bellows 56 and the second cylindrical member 52. The lower end 52d of the second cylindrical member 52 is the lower end of the expanded diameter portion 522. The lower end 52d of the second cylindrical member 52 is joined to the inner circumferential surface 54i of the lower annular member 54 by a welded portion 74 over the entire circumference (see FIG. 3). In the expansion joint assembly 50 according to one embodiment, a lower end 52d of the second tubular member 52 is fixed to an inner circumferential surface 54i of the lower annular member 54 above the multiple inner protrusions 53. This makes it possible to restrict the second tubular member 52 from moving downward.

[0021] In the telescopic joint assembly 50 according to one embodiment, the radially inner end portions 53i of the multiple inner protrusions 53 are located radially inward of the portion of the second tubular member 52 that has the largest radial dimension. In the telescopic joint assembly 50 according to one embodiment, the portion of the second tubular member 52 that has the largest radial dimension is the lower end of the expanded diameter portion 522, i.e., the lower end 52d of the second tubular member 52. According to the expansion joint assembly 50 of the embodiment, even if the second tubular member 52 located above the inner protrusions 53 moves downward for some reason, it interferes with the inner protrusions 53 and cannot move below the inner protrusions 53. This reduces the possibility that the second tubular member 52 moves below the inner protrusions 53 and causes a malfunction. For example, in the heat exchanger 1 of the embodiment, if the second tubular member 52 falls off downward, the heat transfer tube 12 may be damaged. Therefore, in the heat exchanger 1 including the expansion joint assembly 50 of the embodiment, the possibility that the second tubular member 52 falls off downward and damages the heat transfer tube 12 can be reduced.

[0022] In the expansion joint assembly 50 according to one embodiment, the multiple inner protrusions 53 protrude radially inward from the inner circumferential surface 54i of the lower annular member 54 as described above. In other words, the multiple inner protrusions 53 are provided at locations different from the bellows 56. This reduces the effect that the multiple inner protrusions 53 have on the expansion and contraction movement of the bellows 56, making the expansion and contraction movement of the bellows 56 smoother.

[0023] In one embodiment of the expansion joint assembly 50, the radially inner end portions 53i of the multiple inner protrusions 53 are located radially outward from the inner surface 521i of the cylindrical portion 521, which is the inner surface with the smallest radial dimension in the second tubular member 52. As a result, the amount of radial inward protrusion of the multiple inner protrusions 53 becomes relatively small, so that the pressure loss of the fluid flowing inside the expansion joint assembly 50 can be reduced.

[0024] The present disclosure is not limited to the above-described embodiments, and includes modifications to the above-described embodiments and appropriate combinations of these modifications. For example, in the heat exchanger 1 according to the embodiment described above, the first nozzle 21 is attached to the lower half of the body 11 and the second nozzle 22 is attached to the upper half of the body 11, but the first nozzle 21 may be attached to the upper half of the body 11 and the second nozzle 22 may be attached to the lower half of the body 11, or both the first nozzle 21 and the second nozzle 22 may be attached to the upper half of the body 11. In this case, the nozzle attached to the upper half of the body 11 may have the expansion joint assembly 50 according to the embodiment described above, similar to the second nozzle 22 described above.

[0025] In the heat exchanger 1 according to one embodiment, the central axis AX of the nozzle body 31 in the second nozzle 22 extends in the vertical direction, but as long as the upper annular member 55 is positioned above the lower annular member 54, the central axis AX of the nozzle body 31 in the second nozzle 22 may extend in a direction inclined relative to the vertical direction. In other words, as long as the downward movement of the second cylindrical member 52 is restricted by the multiple inner protrusions 53, the extension direction of the second nozzle 22 does not have to be the vertical direction.

[0026] In the above description, an example has been described in which the expansion joint assembly 50 according to one embodiment is applied to a nozzle for circulating a fluid between the inside and outside of the heat exchanger 1. However, the expansion joint assembly 50 according to one embodiment can be applied to various devices, piping equipment, and the like in which the relative position between a mating member to which one end of the expansion joint assembly 50 is connected and a mating member to which the other end is connected changes.

[0027] The contents described in each of the above embodiments can be understood, for example, as follows. (1) An expansion joint assembly 50 according to at least one embodiment of the present disclosure includes a bellows 56 in the shape of a bellows tube formed to be expandable and contractible, and includes a first tubular member 51 extending in the up-down direction, a second tubular member 52 extending in the up-down direction and disposed on the inner circumferential side of the first tubular member 51, and a plurality of inner protrusions 53 provided on the first tubular member 51 below the second tubular member 52 at intervals in the circumferential direction and protruding radially inward. Radially inner end portions 53i of the plurality of inner protrusions 53 are located radially inward of a portion of the second tubular member 52 that has the largest radial dimension.

[0028] According to the above configuration (1), even if the second cylindrical member 52 located above the multiple inner protrusions 53 moves downward for some reason, it will interfere with the multiple inner protrusions 53 and cannot move below the multiple inner protrusions 53. This reduces the possibility that the second cylindrical member 52 will move below the multiple inner protrusions 53 and cause a malfunction.

[0029] (2) In some embodiments, in the configuration of (1) above, the first cylindrical member 51 may include an annular member (lower annular member 54) connected to the lower end of the bellows 56. The multiple inner protrusions 53 may protrude radially inward from an inner circumferential surface 54i of the annular member (lower annular member 54).

[0030] According to the above configuration (2), since the multiple inner protrusions 53 are provided at a location different from the bellows 56, the effect of the multiple inner protrusions 53 on the expansion and contraction movement of the bellows 56 can be reduced, and the expansion and contraction movement of the bellows 56 can be made smoother.

[0031] (3) In some embodiments, in the configuration of (2) above, the lower end 52d of the second cylindrical member 52 may be fixed to the inner surface 54i of the annular member (lower annular member 54) above the multiple inner protrusions 53.

[0032] According to the above configuration (3), the downward movement of the second tubular member 52 can be restricted.

[0033] (4) In some embodiments, in any of the configurations (1) to (3) above, the radially inner end portions 53i of the multiple inner protrusions 53 may be located radially outward of the inner circumferential surface 521i having the smallest radial dimension in the second tubular member 52.

[0034] According to the above configuration (4), the amount of radial inward protrusion of the multiple inner protrusions 53 is relatively small, so that the pressure loss of the fluid flowing inside the expansion joint assembly 50 can be reduced.

[0035] (5) In some embodiments, in any of the configurations (1) to (4) above, the first cylindrical member 51 may include an annular member (lower annular member 54) connected to the lower end of the bellows 56. In some embodiments, in any of the configurations (1) to (4) above, the first cylindrical member 51 may include an outer protrusion 57 that is provided around the entire outer circumferential surface 54o of the annular member (lower annular member 54) and protrudes radially outward. The lower end 54d of the annular member (lower annular member 54) may be inserted into the through hole 16 of the mating member (inner tube 15) to which the annular member (lower annular member 54) is fixed. The outer protrusion 57 may be located above the through hole 16. The outer diameter of the outer protrusion 57 may be larger than the inner diameter of the through hole 16.

[0036] According to the above configuration (5), since the outer protrusion 57 cannot enter the through hole 16 of the mating member (inner tube 15), the downward movement range of the annular member (lower annular member 54) relative to the mating member (inner tube 15) is restricted by the outer protrusion 57. This makes it easy to position the annular member (lower annular member 54) in the height direction relative to the mating member (inner tube 15).

[0037] (6) In some embodiments, in the configuration of (5) above, the lower end portion 54d of the annular member (lower annular member 54) may be welded to the mating member (inner tube 15) with the outer protrusion 57 abutting the mating member (inner tube 15).

[0038] According to the above configuration (6), when joining the annular member (lower annular member 54) to the mating member (inner cylinder 15) by welding, the outer protrusion 57 serves as a backing metal, facilitating welding.

[0039] (7) A heat exchanger 1 according to at least one embodiment of the present disclosure is a heat exchanger 1 that exchanges heat between a first fluid and a second fluid, and includes a first nozzle 21 for causing the first fluid to flow into the heat exchanger 1, and a second nozzle 22 for causing the first fluid to flow out of the heat exchanger 1. At least one of the first nozzle 21 and the second nozzle 22 has an expansion joint assembly 50 having any of the configurations (1) to (6) above provided therein.

[0040] According to the above configuration (7), the possibility that the second cylindrical member 52 will move below the multiple inner protrusions 53 and cause a malfunction in the heat exchanger 1 can be reduced. [Explanation of symbols]

[0041] 1 heat exchanger 11 Torso 12 Heat transfer tube 13 Heat transfer tube group 15 Inner cylinder (mating member) 15i Inner surface 15o outer surface 16 Through hole 21 No. 1 nozzle 22 No. 2 nozzle 31 Nozzle body 50 Telescopic joint assembly 51 First cylindrical member 52 Second cylindrical member 52d bottom end 53 Inner protrusion 53i end 54 Lower annular member (annular member) 54d Lower end 54i Inner surface 55 Upper annular member 56 Bellows 57 Outer protrusion 71, 72, 73, 74 Welded parts 521i Inner surface

Claims

1. A first cylindrical member including a bellows formed to be expandable and contractible and extending in the up-down direction; a second cylindrical member disposed on an inner peripheral side of the first cylindrical member and extending in a vertical direction; a plurality of inner protrusions provided on the first cylindrical member at intervals in a circumferential direction below the second cylindrical member and protruding radially inward; Equipped with an expansion joint assembly, wherein the radially inner end portions of the plurality of inner protrusions are located radially inward of a portion of the second tubular member that has the largest radial dimension.

2. the first tubular member includes an annular member connected to a lower end of the bellows, The inner protrusions protrude radially inward from an inner circumferential surface of the annular member.

2. The expansion joint assembly of claim 1.

3. The lower end of the second cylindrical member is fixed to the inner circumferential surface of the annular member above the inner protrusions.

3. The expansion joint assembly of claim 2.

4. The radially inner end portions of the plurality of inner protrusions are located radially outward of an inner circumferential surface of the second cylindrical member that has the smallest radial dimension. An expansion joint assembly according to any one of claims 1 to 3.

5. the first tubular member includes an annular member connected to a lower end of the bellows, an outer protrusion provided around the entire outer circumferential surface of the annular member and protruding radially outward; Equipped with A lower end portion of the annular member is inserted into a through hole of a mating member to which the annular member is fixed, The outer protrusion is located above the through hole, The outer diameter of the outer protrusion is larger than the inner diameter of the through hole.

3. An expansion joint assembly according to claim 1 or 2.

6. The lower end of the annular member is joined to the mating member by welding in a state in which the outer protrusion is in contact with the mating member.

6. The expansion joint assembly according to claim 5.

7. A heat exchanger for exchanging heat between a first fluid and a second fluid, a first nozzle for allowing the first fluid to flow into an interior of the heat exchanger; a second nozzle for causing the first fluid to flow out of the heat exchanger; Equipped with At least one of the first nozzle and the second nozzle is provided with the expansion joint assembly according to claim 1 or 2 therein. heat exchanger.

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