Wound tube type heat exchanger

Abstract

The utility model discloses a coiled tube type heat exchanger which comprises a core cylinder, a front end and a rear end are symmetrically arranged at the two ends of the core cylinder, a plurality of heat exchange tube bundle sets are arranged on the periphery of the core cylinder in a surrounding mode, the two ends of each heat exchange tube bundle set are fixed to the front end and the rear end respectively, and folded empty areas are arranged between the front end and the core cylinder and between the rear end and the core cylinder respectively. And the two ends of the heat exchange tube bundle set are respectively bent in the hollow folding areas. The utility model has the advantages that: 1, the heat exchange layout is independently formed in each area, and the basically same heat exchange capability of each area is ensured; 2, by arranging a folded empty area and bending design of the inner-layer tube bundle and the middle tube bundle, the fixing mode of a tube hoop is canceled, and the problems of turbulent flow, failure and the like caused by the use of the tube hoop are avoided; and 3, the bending of the heat exchange tube is a three-dimensional space structure or continuous transition without a straight section, the later bending can influence the deformation data of the first bending due to ductility, the bending area is divided, and the bending area is formed at one time through deformation simulation and test correction, so that the problem of shape memory of the heat exchange tube is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to nuclear island main equipment heat exchange subassembly manufacturing technical field, concretely relates to a pipe winding type heat exchanger. BACKGROUND

[0002] The heat exchange subassembly is the main equipment of discharging the heat of the core of small integrated reactor, is a part of the pressure boundary of reactor coolant system, the medium outside the pipe is the primary loop reactor coolant, the medium in the pipe is the secondary loop feed water, the secondary loop feed water is heated by the primary loop coolant, and the outlet forms superheated steam for steam supply or provides the energy required by the rear end power system or the subcooled water of certain temperature for heat supply or the energy required by the terminal. For some special structure large heat exchangers, when the pipe bundle closing end adopts the positioning element such as pipe clamp to be positioned and fixed, the following problems can be caused: 1, the connection is not firm due to improper installation;2, the pipe clamp material and the heat exchanger pipe material thermal expansion coefficient are different, causing the connection to be loose or stress concentration;3, the pipe clamp and the heat exchanger pipe contact are easy to wear when impacted, thereby causing the heat exchanger operation condition to have problems and being difficult to find;4, the pipe clamp is easy to fail when disaster such as earthquake occurs, thereby causing harm. In addition, the pipe bundle is easy to cause the heat exchanger pipe to be thinned and deformed in the winding process due to winding, bending and other factors, thereby causing the service life to be reduced. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the utility model aims at providing a pipe winding type heat exchanger to solve the problems in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized by the following technical scheme:

[0005] A pipe winding type heat exchanger is provided, which comprises a core barrel, the two ends of the core barrel are symmetrically provided with a front end and a rear end, a plurality of heat exchanger tube bundle sets are arranged around the periphery of the core barrel, the two ends of each heat exchanger tube bundle set are fixed to the front end and the rear end respectively, a folding empty area is arranged between the front end and the core barrel and between the rear end and the core barrel respectively, and the two ends of each heat exchanger tube bundle set are folded in the folding empty area.

[0006] In the pipe winding type heat exchanger, the heat exchanger tube bundle set comprises an inner layer tube bundle, an intermediate tube bundle and an outer layer tube bundle, the intermediate tube bundle is at least one layer, the number of heat exchanger tubes in each layer is the same, and the winding directions of the heat exchanger tubes in each layer are opposite.

[0007] In the pipe winding type heat exchanger, a folding empty area is arranged between the front end and the core barrel and between the rear end and the core barrel respectively, and the two ends of the intermediate tube bundle and the inner layer tube bundle are folded in the folding empty area.

[0008] As the round pipe heat exchanger, wherein each layer of pipe bundle closed straight pipe section is evenly divided into n heat exchange regions, and the upper and lower end closing places are one-to-one corresponding, n>=3, n is a natural number, the number of heat exchange pipes in each heat exchange region is uniformly distributed, and when the number of heat exchange pipes in each region cannot be uniformly distributed, the total number of heat exchange pipes in each region is different by at most 1 through staggered partition.

[0009] As the round pipe heat exchanger, wherein the front end and the rear end are respectively provided with connecting pipe holes, the bending points of the inner layer pipe bundle and the intermediate pipe bundle are located at the same positions relative to the axes of the front and rear connecting pipe holes, and the bending modes of the front and rear ends of the inner layer pipe bundle and the intermediate pipe bundle are consistent to form a straight section collinear when the pipe bundle end is inserted into the connecting pipe hole.

[0010] As the round pipe heat exchanger, wherein the inner layer pipe bundle, the intermediate pipe bundle and the outer layer pipe bundle have an inner-outer spacing between two adjacent layers in the empty bending area greater than an inner-outer spacing between two adjacent layers not in the empty bending area.

[0011] As the round pipe heat exchanger, wherein the core barrel is arranged with longitudinal reinforcing ribs, circumferential reinforcing ribs and connecting plates, a gasket is arranged between the longitudinal reinforcing ribs and the core barrel, and the gasket, the longitudinal reinforcing ribs, the circumferential reinforcing ribs and the core barrel are fixedly connected through the connecting plates.

[0012] As the round pipe heat exchanger, wherein the empty bending area is partitioned by partition plates, and the total number of heat exchange pipes in each partitioned area is basically consistent.

[0013] The beneficial effects of the technical scheme of the utility model are as follows:

[0014] 1. Each region forms a heat exchange layout independently, the number of pipe bundles between layers is the same, the total number of heat exchange pipes in each region is different by at most 1 through staggered partition when the number of heat exchange pipes in each region cannot be uniformly distributed, and the heat exchange capacity of each region is basically the same.

[0015] 2. The empty bending area, the inner layer pipe bundle and the intermediate pipe bundle are designed to cancel the fixing mode of the pipe clamp, and the problems of flow disturbance and failure caused by the pipe clamp are avoided.

[0016] 3. The bending of the heat exchange pipe is a three-dimensional space structure or a continuous transition without straight section, the bending of the rear pipe affects the deformation data of the bending of the front pipe, the bending area is divided, the bending area is formed once through simulation deformation and test correction, and the shape memory problem of the heat exchange pipe is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] To further illustrate the above purposes, structural characteristics and effects of the utility model, the utility model will be described in detail below with reference to the drawings.

[0018] Figure 1The structure schematic diagram of the heat exchange tube bundle set of the preferable embodiment of the utility model;

[0019] Figure 2 The structure schematic diagram of the heat exchange tube bundle set of the preferable embodiment of the utility model;

[0020] Figure 3 The structure schematic diagram of the heat exchange tube bundle set of the preferable embodiment of the utility model;

[0021] In the drawing: 1, core barrel; 2, front end; 3, folding empty area; 4, inner layer tube bundle; 5, middle tube bundle; 6, outer layer tube bundle; 7, partition plate; 8, longitudinal reinforcing rib; 9, circumferential reinforcing rib; 10, connecting plate; 11, pad strip. DETAILED DESCRIPTION

[0022] The terms "utility model" and "the utility model" as used in this specification are intended to mean all subject matter of this specification and of any patent claims below. The inclusion of these terms should not be interpreted as limiting the subject matter described herein or limiting the meaning or scope of any patent claims below. Furthermore, this specification does not attempt to describe or limit the subject matter covered by any claims of this application based on any particular component, paragraph, statement or figure. The subject matter should be understood with reference to the entire specification, all figures, and any claims below. The utility model can have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the language and terminology employed herein are for the purpose of description and should not be regarded as limiting.

[0023] The details of the utility model will now be discussed with reference to the accompanying drawings, which illustrate the utility model by way of example only. In the drawings, like features or components can be denoted by the same reference numerals.

[0024] The use of "comprise", "have" and "include" and variations thereof herein is meant to be open-ended and allow for items to be included in addition to those listed. Although reference can be made in the description to directions such as above, below, up, down, rear, front, back, bottom, top, etc., with respect to the drawings, these directions are for convenience only and are not intended to limit the utility model in any way. Furthermore, terms such as "first", "second", "third" etc. are used herein for the purpose of description and are not intended to indicate or imply importance or significance.

[0025] Referring to Figure 1 As shown, in the preferable embodiment, the utility model winding pipe heat exchanger includes core barrel 1, the two ends of core barrel 1 are symmetrically provided with front end 2 and rear end, and a plurality of heat exchange tube bundle sets are arranged around the circumference of core barrel 1, and the two ends of the heat exchange tube bundle set are fixed to front end 2 and rear end respectively.

[0026] Referring to Figure 2 ,Figure 3 As shown, the heat exchange tube bundle set includes an inner layer tube bundle 4, an intermediate tube bundle 5, and an outer layer tube bundle 6, the intermediate tube bundle 5 is at least one layer, and the front end 2 and the rear end are respectively provided with a folding empty area 3 between the core barrel 1, the two ends of the intermediate tube bundle 5 and the inner layer tube bundle 4 are respectively folded in the folding empty area 3.

[0027] Each layer of tube bundle closing straight pipe section is evenly divided into n heat exchange regions, and the upper and lower end closing places are one-to-one corresponding, n≥3, n is a natural number, the number of heat exchange tubes in each heat exchange region is uniformly distributed, and when the distribution cannot be uniform, staggered distribution is used to realize that the total number of each region differs by at most 1.

[0028] The folding empty area 3 is provided with partition plates 7 arranged at intervals, the folding empty area 3 is partitioned by the partition plates 7, the total number of heat exchange tubes in each region is basically consistent, and the partition plates 7 simultaneously enhance the fixation of the front end 2 and the rear end to the core barrel 1. The existence of the folding empty area 3 increases the space between the layers of the tube bundle, so that the inner layer tube bundle 4 and the intermediate tube bundle 5 have enough space to be folded, and it is ensured that there is enough space between them, and thus the possibility of collision under certain working conditions and earthquake conditions can be avoided without using a pipe clamp.

[0029] The front end 2 and the rear end are respectively provided with a connecting pipe hole, when the heat exchange tube is wound, through the stepped arrangement of each region, the relative positions of the bending points of the inner layer tube bundle 4 and the intermediate tube bundle 5 and the axes of the front and rear connecting pipe holes are consistent, the front and rear bending modes of the inner layer tube bundle 4 and the intermediate tube bundle 5 are consistent, so as to form a straight section collinear when the tube bundle end is inserted into the connecting pipe hole, each heat exchange tube is arranged in this way, the front and rear layouts of each region are consistent, and it is ensured that the length of each tube bundle in the same partition is consistent, which is beneficial to realize uniform heat exchange effect.

[0030] The core barrel 1 is provided with longitudinal reinforcing ribs 8, circumferential reinforcing ribs 9, and connecting plates 10 on the side, the longitudinal reinforcing ribs 8 are provided with a gasket 11 between the core barrel 1, the gasket 11, the longitudinal reinforcing ribs 8, and the circumferential reinforcing ribs 9 are fixedly connected with the core barrel 1 through the connecting plates 10, and each layer of the tube bundle is fixed on the gasket 11. The contact surface between the connecting plate 10 and the core barrel 1 is processed into a slope shape, so that the installation of the gasket 11 is more convenient and fast, and each gasket 11 is connected through the connecting plate 10, and the strength is further improved.

[0031] In specific implementation, the structural arrangement mode is arranged according to the overall working condition requirement, so as to form different combinations for the purpose of meeting the use.

[0032] For example, the uniform arrangement mode adopted this time, the product is divided into 8 regions as a whole, and the total number of heat exchange tubes in each region is kept consistent as much as possible (when the number cannot be evenly distributed, the deviation is not more than 1 and the distribution is staggered), and the distribution mode of each layer of tube is as follows:

[0033] Zone 1 2 3 4 5 6 7 8 Inner layer 12 13 12 12 13 12 13 12 Middle layer 12 12 13 12 12 13 12 13 Outer layer 13 12 12 13 12 13 12 12 Total 37 37 37 37 37 38 37 37

[0034] The inner-outer spacing between two adjacent layers in the folded space 3 of the inner layer tube bundle 4, the middle tube bundle 5 and the outer layer tube bundle is greater than the inner-outer spacing between two adjacent layers in the non-folded space 3.

[0035] Arrangement method:

[0036] 1. The number of heat exchange tubes and the winding spiral angle are determined according to working conditions, and are designed and calculated according to heat exchange capacity.

[0037] 2. The heat exchange tubes are divided into zones according to the number of heat exchange tubes, and the tube hole arrangement is performed according to the space spacing.

[0038] 3. The winding length is calculated according to the winding parameters, and the heat exchange tube step gradient is determined according to the tube hole spacing, so as to ensure that the lengths of heat exchange tubes in each zone are consistent.

[0039] 4. The core barrel length and structure shape are determined according to the winding length of the heat exchange tube and the step gradient.

[0040] 5. The bending mode and bending shape are determined according to the space between the center barrel and the barrel.

[0041] 6. The final assembled structure is consistent and meets the requirements of the product.

[0042] The utility model discloses realized under not using the pipe clamp, guarantee the clearance between the heat exchange tube of heat exchange tube bundle closing end, avoid the mutual collision of heat exchange tube under the external vibration or self resilience.

[0043] The above is only the preferred embodiment of the utility model, and does not limit the implementation mode and protection scope of the utility model, and for the person skilled in the art, it should be realized that the scheme obtained by equivalent replacement and obvious change of the utility model specification and drawing content should be contained in the protection scope of the utility model.

Claims

1. A coiled tube heat exchanger, characterized in that: The core tube comprises a core tube, the two ends of which are symmetrically provided with a front end and a rear end, a plurality of heat exchange tube bundles are arranged around the circumference of the core tube, and the two ends of the heat exchange tube bundles are respectively fixed to the front end and the rear end.

2. The coiled tube heat exchanger according to claim 1, characterized in that: The heat exchange tube bundle set includes an inner tube bundle, an intermediate tube bundle and an outer tube bundle. The intermediate tube bundle is at least one layer. The number of heat exchange tubes in each layer of tube bundle is the same and the winding directions are opposite.

3. The coiled tube heat exchanger according to claim 2, characterized in that: A folding area is provided between the front end and the core barrel, and between the rear end and the core barrel, respectively. Both ends of the middle tube bundle and the inner tube bundle are bent in the folding area respectively.

4. The coiled tube heat exchanger according to claim 3, characterized in that: The straight pipe section at the end of each tube bundle is evenly divided into n heat exchange areas, and the upper and lower end ends correspond to each other. n ≥ 3, where n is a natural number. The number of heat exchange tubes in each heat exchange area is evenly distributed. When it is impossible to evenly distribute the heat exchange tubes in each area, staggered partitioning is used to achieve a maximum difference of 1 in the total number of heat exchange tubes in each area.

5. The coiled tube heat exchanger according to claim 4, characterized in that: The front end and the rear end are respectively provided with connecting pipe holes. The bending points of the inner tube bundle and the middle tube bundle are aligned with the relative positions of the axes of the front and rear connecting pipe holes. The front and rear ends of the inner tube bundle and the middle tube bundle are bent in the same manner so that the straight sections of the tube bundle ends are collinear when inserted into the connecting pipe holes.

6. The coiled tube heat exchanger according to claim 4, characterized in that: The inner-to-outer spacing between two adjacent layers of the inner tube bundle, the middle tube bundle and the outer tube bundle in the folded area is greater than the inner-to-outer spacing between two adjacent layers outside the folded area.

7. The coiled tube heat exchanger according to claim 4, characterized in that: The core tube is provided with longitudinal reinforcing ribs, circumferential reinforcing ribs and connecting plates on its circumferential side. A pad is provided between the longitudinal reinforcing rib and the core tube. The pad, the longitudinal reinforcing rib and the circumferential reinforcing rib are fixedly connected to the core tube via the connecting plates.

8. The coiled tube heat exchanger according to claim 3, characterized in that: Partition plates are arranged at intervals in the folded area, and the folded area is divided into sections by the partition plates. The total number of heat exchange tubes in each section is substantially the same.

Images