Core body structure of winding pipe type heat exchanger

Abstract

A core body structure of a winding pipe type heat exchanger comprises a center cylinder, a winding pipe, a winding pipe and a winding pipe, the first tube plate and the second tube plate are respectively arranged at the two ends of the central cylinder to close the openings at the two ends of the space; the gas conveying pipe is provided with a gas outlet and is arranged in the central cylinder, and a first end opening of the gas conveying pipe is formed in the first pipe plate so that external inert gas can enter the gas conveying pipe; a first end of the gas delivery pipe is provided with a first plug capable of opening and closing the first end; through holes are formed in the first tube plate or / and the second tube plate so that gas in the space can be exhausted, and second plugs capable of opening and closing the through holes are arranged at the through holes. External inert gas can enter the center cylinder through the gas conveying pipe, air in the center cylinder is forced to be discharged from the through holes in the pipe plate, the first end of the gas conveying pipe and the through holes in the pipe plate are closed through the plug, so that the leakproofness of the inner space of the center cylinder can be guaranteed, and the center cylinder filled with the inert gas is equivalent to a pressure container; and a shell pass medium can be prevented from entering.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and particularly relates to a core structure of a wound tube heat exchanger. Background Art

[0002] As a new type of high-efficiency heat exchanger, the wound tube heat exchanger has the characteristics of compact structure, high heat transfer coefficient, good thermal compensation and basically no heat transfer dead zone, and is widely used in multiple fields such as low-temperature methanol washing, air separation, oil refining, etc.

[0003] The existing wound tube heat exchangers usually include a shell and a core structure arranged inside the shell. The core structure is mostly composed of a central tube, tube sheets arranged at both ends of the central tube, and heat exchange tubes wound around the outer periphery of the central tube, and both ends of the heat exchange tubes are supported on the corresponding tube sheets. The specific structure is as disclosed in the Chinese utility model patent "A Core Structure of a Wound Tube Heat Exchanger" with the patent number 202321864005.X and the authorization announcement number CN220418165U, and the Chinese utility model patent "A Manufacturing Method of a Core of a Wound Tube Heat Exchanger" with the patent number 202310019979.6 and the authorization announcement number CN116329410A, etc. During use, the shell-side medium in the shell-side cylinder exchanges heat with the tube-side medium in the heat exchange tubes.

[0004] However, during heat exchange, the flow of the heat exchange medium will generate noise, and when the overall size of the heat exchanger increases, the noise will also increase, affecting the use experience.

[0005] At the same time, during heat exchange, the shell-side medium in the shell-side cylinder may enter the central tube under the action of pressure, affecting the heat exchange effect. Summary of the Utility Model

[0006] The first technical problem to be solved by the utility model is to provide a core structure of a wound tube heat exchanger according to the current situation of the prior art, so as to prevent the shell-side medium from entering the central tube.

[0007] The second technical problem to be solved by the utility model is to provide a core structure of a wound tube heat exchanger to reduce the noise during heat exchange.

[0008] The technical solution adopted by the utility model to solve the above first technical problem is: a core structure of a wound tube heat exchanger, including:

[0009] A central tube, with a hollow interior forming a space open at both ends;

[0010] A first tube sheet and a second tube sheet, respectively arranged at both ends of the central tube to close the openings at both ends of the space;

[0011] The heat exchange tubes extend along the axial direction of the central cylinder and are spirally wound layer by layer from the inside to the outside around the outer periphery of the central cylinder to form a multi-layer spiral tube, and both ends of the heat exchange tubes are respectively supported on the first tube sheet and the second tube sheet;

[0012] It is characterized in that it further includes:

[0013] A gas transmission pipe with an air outlet is arranged inside the central cylinder, and the first end of the gas transmission pipe opens at the first tube sheet for inert gas from the outside to enter the gas transmission pipe; at the same time, a first plug for opening and closing the first end is provided at the first end of the gas transmission pipe;

[0014] And, through holes penetrating the thickness of the first tube sheet and / or the second tube sheet are provided for the gas in the space to be discharged, and a second plug for opening and closing the through holes is provided at the through holes.

[0015] In this way, inert gas from the outside can enter the central cylinder through the gas transmission pipe, forcing the air in the central cylinder to be discharged from the through holes on the tube sheet. Closing the first end of the gas transmission pipe and the through holes on the tube sheet with the first plug and the second plug can ensure the airtightness of the internal space of the central cylinder, and the central cylinder filled with inert gas is equivalent to a pressure vessel, which can prevent the shell-side medium from entering it.

[0016] Preferably, the gas transmission pipe extends along the axial direction of the central cylinder, and the tube wall of the gas transmission pipe is spaced relative to the tube wall of the central cylinder.

[0017] The above air outlet can be only one or two or more. Preferably, a plurality of the above air outlets are distributed at intervals along the length direction on the tube wall of the gas transmission pipe.

[0018] Preferably, the second end of the gas transmission pipe is spaced relative to the second tube sheet;

[0019] It further includes a limiting member, which is located inside the central cylinder and is fixed relative to the central cylinder, and a through hole for the gas transmission pipe to pass through is provided on the limiting member to confine the gas transmission pipe inside the central cylinder.

[0020] Furthermore, there are at least two of the limiting members, and they are arranged at intervals along the axial direction of the central cylinder. Of course, there can also be only one limiting member.

[0021] Furthermore, the limiting member is in a rod shape, its first end is arranged on the tube wall of the central cylinder, and its second end extends radially relative to the tube wall of the central cylinder and is provided with the above through hole.

[0022] In the above-mentioned various solutions, preferably, the first end of the central cylinder is fixed on the first tube sheet, and the second end is constrained together with the second tube sheet in a manner that can reciprocally expand and contract relative to the second tube sheet.

[0023] Furthermore, an installation post extending along the axial direction of the central cylinder is convexly provided on the second tube sheet, and the second end of the central cylinder is sleeved on the outer periphery of the installation post, and the side peripheral surfaces of the two are attached to each other.

[0024] To further solve the above-mentioned second technical problem, preferably, it further includes an annular sound-absorbing cylinder, the peripheral wall of which encloses a sound-absorbing cavity with both ends open, and the peripheral wall is arranged circumferentially between two adjacent layers of spiral tubes.

[0025] In this way, during heat exchange, the sound-absorbing cylinder of the present invention can absorb the noise generated during the heat exchange of the inner core structure, achieving a noise reduction effect; at the same time, since both ends of the sound-absorbing cylinder are open, the shell-side medium for heat exchange can enter and exit the sound-absorbing cylinder for heat exchange, without affecting the normal heat exchange work of the core structure.

[0026] Furthermore, there are at least two sound-absorbing cylinders, which are arranged along the axial direction of the central cylinder;

[0027] The inner diameters of two adjacent sound-absorbing cylinders in the axial direction are different, so that the two are arranged one inside and one outside between the corresponding two adjacent layers of spiral tubes. Thus, it can ensure that the shell-side medium for heat exchange enters and exits each sound-absorbing cylinder.

[0028] Compared with the prior art, the advantages of the present invention are as follows: the arrangement of the gas transmission pipe in the present invention enables the external inert gas to enter the central cylinder through the gas transmission pipe, forcing the air in the central cylinder to be discharged from the through holes on the tube sheet. Closing the first end of the gas transmission pipe and the through holes on the tube sheet with the first plug and the second plug can ensure the airtightness of the internal space of the central cylinder, and the central cylinder filled with inert gas is equivalent to a pressure vessel, which can prevent the shell-side medium from entering it. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0030] Figure 2 is Figure 1 an enlarged view of Part A in

[0031] Figure 3 is Figure 1 a magnified view of the partial structure in

[0032] Figure 4 is Figure 1 another magnified view of the partial structure in

[0033] Figure 5 is a schematic structural diagram of Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present invention will be further described in detail below with reference to the embodiments in the drawings.

[0035] Embodiment 1:

[0036] As Figures 1 to 4 shown, this is the first preferred embodiment of the core structure of a wound tube heat exchanger of the present utility model. The core structure includes a central cylinder 1, heat exchange tubes 2, a first tube sheet 5, a second tube sheet 6, a gas transmission pipe 7, and a limiting member 8.

[0037] Among them, the central cylinder 1 is arranged vertically, and its interior is hollow to form a space with open upper and lower ends.

[0038] The above-mentioned first tube sheet 5 and second tube sheet 6 are respectively arranged at the lower end and the upper end of the central cylinder 1 to close the open ends of the space, making the space a closed space. In this embodiment, the lower end of the central cylinder 1 is fixed in the center of the first tube sheet 5 by welding, and the upper end of the central cylinder 1 is constrained with the second tube sheet 6 in a manner that can relatively move back and forth with respect to the second tube sheet 6. Specifically, a downwardly extending mounting post 61 protrudes from the center of the second tube sheet 6, and the upper end of the central cylinder 1 is sleeved on the outer periphery of the mounting post 61, and their side circumferential surfaces are in contact.

[0039] The above-mentioned heat exchange tubes 2 extend along the axial direction of the central cylinder 1 and are spirally wound layer by layer from the inside to the outside around the outer periphery of the central cylinder 1 to form multiple layers of spiral tubes 20. The adjacent two layers of spiral tubes 20 are separated by axially extending cushion strips. The cushion strips and the connection structure between the cushion strips and the heat exchange tubes are the same as those in the prior art (for example, reference can be made to the Chinese utility model patent "A cushion strip for a wound tube heat exchanger" with patent number 202120502424.3 and authorization announcement number CN214842720U, and the Chinese utility model patent "A connection structure of heat exchange tubes of a wound tube heat exchanger" with patent number 202120502461.4 and authorization announcement number CN214842721U), which will not be elaborated here. And the two ends of the heat exchange tubes 2 are respectively supported on the first tube sheet 5 and the second tube sheet 6.

[0040] The above-mentioned gas transmission pipe 7 is vertically arranged in the central cylinder 1, and the first end 71 at the lower side of the gas transmission pipe 7 opens to the first tube sheet 5 to allow inert gas from the outside to enter the gas transmission pipe 7. A through hole 50 penetrating the thickness of the self is provided on the first tube sheet 5, and a second plug 712 capable of opening and closing the through hole 50 is provided at the through hole 50. A first plug 711 capable of opening and closing the first end 71 is provided at the first end 71 of the gas transmission pipe 7. The second end 72 at the upper side of the gas transmission pipe 7 is spaced opposite to the second tube sheet 6. The pipe wall of the gas transmission pipe 7 is spaced opposite to the cylinder wall of the central cylinder 1, and a plurality of air outlets are distributed at intervals along the length direction on the pipe wall of the gas transmission pipe 7. In this way, the inert gas from the outside can enter the central cylinder 1 through the first end of the gas transmission pipe 7, forcing the air in the central cylinder 1 to be discharged from the through hole 50 on the first tube sheet 5. Closing the first end 71 of the gas transmission pipe 7 and the through hole 50 on the first tube sheet 5 with the first plug 711 and the second plug 712 can ensure the tightness of the internal space of the central cylinder 1, and the central cylinder 1 filled with inert gas is equivalent to a pressure vessel, which can prevent the shell-side medium from entering it.

[0041] In order to better restrain the gas transmission pipe 7, in this embodiment, the above-mentioned limiting member 8 is rod-shaped and is located in the central cylinder 1. The first end portion of the limiting member 8 is provided on the cylinder wall of the central cylinder 1. The second end portion of the limiting member 8 extends radially relative to the cylinder wall of the central cylinder 1 and is provided with a through hole 80 penetrating up and down for the gas transmission pipe 7 to pass through. And in this embodiment, there are a plurality of limiting members 8, which are arranged at intervals in the up and down direction. In this way, the limiting member 8 can restrain the gas transmission pipe 7, and at the same time, the through hole 80 on the limiting member 8 can provide the possibility for the gas transmission pipe 7 to expand and contract due to heat.

[0042] Embodiment Two:

[0043] As Figure 5 shown, it is a preferred Embodiment Two of the core structure of a wound tube heat exchanger of the present utility model. This embodiment is basically the same as Embodiment One, the difference being that this embodiment further includes a sound-absorbing cylinder 3. Specifically, the sound-absorbing cylinder 3 is annular, the peripheral wall thereof encloses a sound-absorbing cavity with both ends open, and the peripheral wall is arranged circumferentially between two adjacent layers of spiral tubes 20. And the wall thickness of the peripheral wall of the sound-absorbing cylinder 3 is smaller than the distance between the adjacent layers of spiral tubes 20 where it is located, and the sound-absorbing cylinder 3 is constrained together with the corresponding cushion strip. In this embodiment, there are four sound-absorbing cylinders 3, which are arranged axially along the central cylinder 1. And the inner diameters of two adjacent sound-absorbing cylinders 3 in the axial direction are different. The first sound-absorbing cylinder 3 with a large inner diameter and the second sound-absorbing cylinder 3 with a small inner diameter are alternately arranged along the axial direction of the central cylinder 1 in sequence, so that each sound-absorbing cylinder 3 is respectively distributed between different layers of spiral tubes 20. At the same time, the adjacent ends of two adjacent sound-absorbing cylinders 3 in the axial direction overlap each other with one inside and the other outside to form an annular gap 31.

[0044] During heat exchange, the sound-absorbing cylinder 3 can absorb the noise generated during the heat exchange of the inner core structure, achieving the effect of noise reduction. At the same time, since both ends of the sound-absorbing cylinder 3 are open, the shell-side medium for heat exchange can enter and exit the sound-absorbing cylinder for heat exchange, without affecting the normal heat exchange work of the core structure.

Claims

1. A core structure of a wound tube heat exchanger, comprising: The central tube (1) is hollow inside to form a space with open ends; A first tube sheet (5) and a second tube sheet (6) are respectively arranged at two ends of the central tube (1) to close the openings at both ends of the space; The heat exchange tube (2) extends along the axial direction of the central tube (1) and is spirally wound layer by layer from the inside to the outside on the outer circumference of the central tube (1) to form a multi-layer spiral tube (20), and the two ends of the heat exchange tube (2) are respectively supported on the first tube sheet (5) and the second tube sheet (6); Features Also included are: A gas delivery pipe (7) with a gas outlet is arranged in the central tube (1), and a first end (71) of the gas delivery pipe (7) opens at the first tube sheet (5) to allow external inert gas to enter the gas delivery pipe (7); and a first plug (711) capable of opening and closing the first end (71) is provided at the first end (71) of the gas delivery pipe (7); Furthermore, the first tube sheet (5) and / or the second tube sheet (6) are provided with a through hole (50) penetrating the thickness of the tube sheet itself to allow the gas in the space to be discharged, and a second plug (712) capable of opening and closing the through hole (50) is provided at the through hole (50).

2. The core structure according to claim 1, characterized in that: The gas delivery pipe (7) extends along the axial direction of the central tube (1), and the tube wall of the gas delivery pipe (7) is spaced apart from and opposed to the tube wall of the central tube (1).

3. The core structure according to claim 2, characterized in that: A plurality of the above-mentioned gas outlets are spaced apart and distributed along the length direction on the pipe wall of the gas delivery pipe (7).

4. The core structure according to claim 2, characterized in that: The second end (72) of the gas delivery pipe (7) is spaced apart and opposite to the second tube sheet (6); It also includes a limiting member (8) which is located in the central tube (1) and is fixed relative to the central tube (1), and the limiting member (8) is provided with a through hole (80) for the gas pipe (7) to pass through, so as to constrain the gas pipe (7) in the central tube (1).

5. The core structure according to claim 4, characterized in that: There are at least two limiting members (8), which are arranged at intervals along the axial direction of the central tube (1).

6. The core structure according to claim 4, characterized in that: The limiting member (8) is rod-shaped, with a first end portion disposed on the wall of the central tube (1), and a second end portion extending radially relative to the wall of the central tube (1) and provided with the above-mentioned through hole (80).

7. The core structure according to any one of claims 1 to 6, characterized in that: The first end of the central tube (1) is fixed on the first tube sheet (5), and the second end is constrained together with the second tube sheet (6) in a manner that it can be telescoped back and forth relative to the second tube sheet (6).

8. The core structure according to claim 7, characterized in that: The second tube sheet (6) is provided with a mounting column (61) extending along the axial direction of the central tube (1). The second end of the central tube (1) is sleeved on the outer periphery of the mounting column (61), and the side circumferences of the two are in contact with each other.

9. The core structure according to any one of claims 1 to 6, characterized in that: It also includes an annular sound-absorbing tube (3), the peripheral wall of which encloses a sound-absorbing cavity with two open ends, and the peripheral wall is arranged between two adjacent layers of spiral tubes (20) along the circumferential direction.

10. The core structure according to claim 9, characterized in that: There are at least two sound-absorbing tubes (3), which are arranged along the axial direction of the central tube (1); The inner diameters of two adjacent sound-absorbing tubes (3) in the axial direction are different, so that the two are arranged, one inside and one outside, between the two corresponding adjacent layers of spiral tubes (20).

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