Heat exchanger with swirl baffles

Abstract

The present invention discloses a heat exchanger with swirl baffles, comprising a heat exchanger shell and a head, wherein a shell-side connecting pipe is arranged on the heat exchanger shell, and a tube-side connecting pipe is arranged on the head, and the heat exchanger shell is characterized in that a plurality of groups of stepped swirl baffles are arranged in the heat exchanger shell, each group of the swirl baffles is divided into a plurality of small steps, each of the small steps is also provided with a through hole, and the through hole is used to penetrate the tube-side connecting pipe, and the axial projection of a single group of swirl baffles is a semicircle; the swirl baffles of the present invention have a simple structure, a reasonable design, convenient installation and excellent effect, and multiple groups of swirl baffles are fixedly arranged, and no complicated steps are required during installation, and the installation is very convenient, and the flow mode of the shell-side fluid is along the setting direction of the swirl baffle combined with the outer wall of the medium pipeline and the threaded groove in the heat exchanger shell to help improve the heat exchange effect, and the overall fixed installation structure avoids the problem of local short circuit of the shell-side fluid that is not conducive to heat dissipation.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange equipment, in particular to a heat exchanger with swirl baffles. Background Art

[0002] With the rapid development of economy and industry, countries around the world are facing the problem of energy shortage, so how to efficiently utilize existing energy is the focus of increasing attention of people in all countries. Among them, the heat exchanger is an energy-saving device that realizes heat transfer between materials between two or more fluids at different temperatures. It transfers heat from a higher temperature fluid to a lower temperature fluid. It is one of the main devices for improving energy utilization. At present, the most widely used heat exchangers are bow baffles and spiral baffles.

[0003] Bow-shaped baffles cause the fluid to flow in a Z-shape in the shell, with throttling and dead zones in the flow; this causes unfavorable factors such as large shell-side pressure drop, low membrane coefficient, easy scaling, and easy vibration. In recent years, it has gradually been replaced by spiral baffles.

[0004] Compared with the bow baffles, the heat exchanger with spiral baffles has the fluid rotating around the axis of the tube bundle in the shell, and there is no throttling and dead zone in the flow; the shell resistance is reduced, the membrane heat transfer coefficient is slightly improved, the medium is not easy to scale and foul in the shell, and it can operate with high efficiency and long period. However, it was found during use that due to the formation of a gap at the overlap between two adjacent baffles, a fast flow channel will be formed at the gap, resulting in a local short circuit of the shell fluid. Therefore, compared with the bow baffle heat exchanger, the improvement of the heat transfer coefficient of the spiral baffle heat exchanger is not obvious. In addition, one pitch in the tube bundle of the spiral baffle heat exchanger is composed of multiple baffles, so there are many baffles in a tube bundle, which is difficult to install, and the roundness and concentricity of the tube bundle are not guaranteed, and the rigidity of the tube bundle is not very good.

[0005] In order to solve the above problems, the Chinese invention patent "A spiral folded baffle shell and tube heat exchanger" (application number: CN201310289765.7) with authorization announcement number CN103398624B discloses a structure that uses a spiral folded baffle to improve the dead zone of the shell flow of the bow baffle and the short circuit of the spiral baffle notch, thereby improving the heat exchange efficiency.

[0006] However, the above structure is realized by controlling the bending angle of the baffle. Different bending angles of the baffle bring different heat transfer effects. The processing and assembly precision of the folded baffle are high, which not only has high manufacturing cost, but also makes the tube bundle assembly difficult. Summary of the invention

[0007] In order to solve the above problems, the purpose of the present invention is to provide a heat exchanger made of a swirl baffle in a bow-shaped stepped shape, which is easy to process and assemble compared with existing products, and improves the problem of local short-circuiting of shell-side fluid in the prior art, which affects heat dissipation.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a heat exchanger with swirl baffles, characterized in that it includes a heat exchanger shell with an inner cavity and sealed at both ends in a cylindrical shape and a head for sealing the heat exchanger shell, the heat exchanger shell is provided with a plurality of shell-side pipes for shell-side fluid to flow in and out, a sealing plate is provided between the head and the heat exchanger shell, the head is provided with a tube-side pipe for tube-side fluid to flow in and out, the inner cavity of the heat exchanger shell is cylindrical and is provided with a plurality of groups of stepped swirl baffles, each group of the swirl baffles is divided into a plurality of small steps, each of the small steps is also provided with a through hole, the size of the through hole matches the medium pipeline in the heat exchanger and is used to penetrate the medium pipeline, and all the small steps are arranged in parallel.

[0009] Through the above-mentioned arrangement, compared with the prior art, the heat exchanger of this scheme adopts a stepped swirl baffle to avoid the dead zone of shell flow and improve the heat exchange effect. Secondly, the stepped plate surface and the through-hole processing are all on the vertical plane. Compared with the spiral or inclined baffle, the processing difficulty is greatly reduced but the heat exchange effect is significant. Secondly, it is very convenient to install without aligning the angle or direction for installation. It only needs to be installed according to the medium pipeline as a positioning through-hole.

[0010] As a further configuration of the above scheme, every two groups of swirl baffles are arranged in a "V" shape and their axial projections are full circles with a number of through holes, at least one of which; the axial projection size of each group of swirl baffles is set according to heat exchange requirements and is at least one half of a perfect circle.

[0011] Through the above arrangement, the contact effect between the shell-side fluid and the medium channel during the flow process is better, and the heat exchange efficiency is high.

[0012] As a further configuration of the above scheme, in the heat exchanger, two groups of swirl baffles arranged in coordination are connected and used in coordination according to the length of the heat exchanger shell.

[0013] As a further configuration of the above scheme, after the swirl baffles are formed by stamping, the two groups of stepped swirl baffles are connected end to end by welding.

[0014] As a further configuration of the above scheme, the small steps of the swirl baffles are arranged in three layers on a group of swirl baffles, and the top and bottom layers of each swirl baffle are provided with a perfect circle and a semicircular through hole, and the middle layer is provided with two perfect circle through holes.

[0015] As a further configuration of the above scheme, spiral grooves are provided on the outer surface of the medium pipe in the heat exchanger and the inner wall of the heat exchanger shell along the flow direction of the shell-side fluid, and the spiral angle of the spiral grooves is 60°.

[0016] As a further configuration of the above solution, the small step of the swirl baffle and the connecting plate between the upper and lower steps are vertically arranged at an angle of 90°.

[0017] Compared with the prior art, the present invention has the following outstanding advantages: compared with the prior art, the swirl baffles of the present invention are fixed in multiple groups, and no complicated steps are required during installation, and the installation is very convenient. The processing only requires stamping and welding, and the steps are relatively simple. The flow mode of the shell-side fluid is along the setting direction of the swirl baffles, combined with the outer wall of the medium pipeline and the threaded grooves in the heat exchanger shell to help improve the heat exchange effect. Compared with the spiral baffles or bow-shaped baffles in the prior art, the swirl baffles of the present invention have a simple structure, reasonable design, easy installation and excellent effect. The overall fixed installation structure avoids the problem of local short-circuiting of the shell-side fluid that is not conducive to heat dissipation. The stepped design has a certain blocking effect on the circulation of the shell-side fluid, so that the shell-side fluid is continuously rolled in the heat exchanger shell, reducing the flow rate of the shell-side fluid and the contact with the medium pipeline, so that it can better exchange heat with the medium pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a schematic diagram of the heat exchanger structure of the present invention;

[0019] Attached Figure 2 is a schematic diagram of the cross-sectional structure of the heat exchanger of the present invention;

[0020] Attached Figure 3 It is a schematic diagram of the structure of a single set of swirl baffles of the present invention.

[0021] Figure numerals: 1, heat exchanger shell; 11, spiral groove; 2, head; 3, shell-side connecting pipe; 4, tube-side connecting pipe; 5, medium pipeline; 6, swirl baffle; 61, small step; 62, through hole. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below. The examples of the embodiments are intended to explain the present invention and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in the art or in the product descriptions are followed. The instruments used are not specified and are all conventional products that can be purchased commercially.

[0023] As attached Figure 1-3As shown, a heat exchanger with swirl baffles is characterized in that it includes a heat exchanger shell 1 with an inner cavity and sealed at both ends in a cylindrical shape and a head 2 for sealing the heat exchanger shell 1, the heat exchanger shell 1 is provided with a plurality of shell-side pipes 3 for shell-side fluid to flow in and out, a sealing plate 21 is provided between the head 2 and the heat exchanger shell 1, and the head 2 is provided with a tube-side pipe 4 for tube-side fluid to flow in and out, the inner cavity of the heat exchanger shell 1 is cylindrical and is provided with a plurality of groups of stepped swirl baffles 6, each group of the swirl baffles 6 is divided into a plurality of small steps 61, and each of the small steps 61 is also provided with a through hole 62, the size of the through hole 62 matches the medium pipeline 5 in the heat exchanger and is used to penetrate the medium pipeline 5, and all the small steps 61 are arranged in parallel planes.

[0024] As a further arrangement of the above scheme, each two groups of the swirl baffles 6 are arranged in a "V" shape and their axial projections are full circles with a plurality of through holes, at least one of which; the axial projection size of each group of the swirl baffles 6 is set according to the heat exchange requirements and is at least one half of a perfect circle.

[0025] As a further configuration of the above scheme, in the heat exchanger, according to the length of the heat exchanger shell 1, a plurality of two groups of swirl baffles 6 are connected for coordinated use.

[0026] As a further configuration of the above scheme, after the swirl baffles 6 are formed by stamping, two groups of stepped swirl baffles 6 are connected end to end by welding.

[0027] As a further configuration of the above scheme, the small steps 61 of the swirl baffles 6 are arranged in three layers on a group of swirl baffles 6, and the top and bottom layers of each swirl baffle 6 are provided with a perfect circle and a semicircular through hole 62, and the middle layer is provided with two perfect circle through holes 62.

[0028] As a further configuration of the above scheme, spiral grooves 11 are provided on the outer surface of the medium pipe 5 in the heat exchanger and the inner wall of the heat exchanger shell 1 along the flow direction of the shell-side fluid, and the spiral angle of the spiral grooves 11 is 60°.

[0029] As a further configuration of the above solution, the small step 61 of the swirl baffle 6 is vertically arranged at an angle of 90° to the connecting plate between the upper and lower steps.

[0030] The heat exchanger of the present invention has a simple structure, reasonable design and convenient assembly. Compared with the existing bow-shaped baffles, the shell-side fluid flows without dead zones between the medium pipeline and the heat exchanger shell. It runs along the stepped direction, combined with the enhanced guidance of the threaded groove and the increased contact heat transfer area, which greatly improves the heat transfer coefficient of the heat exchange device. Compared with the spiral baffles, the swirl baffles of the present invention are formed by stamping and welding, and their production is very convenient and efficient, and the installation is simple and the concentricity is well maintained. If the length of the baffle is slightly shorter than the length of the heat exchanger shell, a group of baffles can be directly covered with the medium pipeline, and fixed and installed by using the through holes and the medium pipeline sleeves to fit together, which is very convenient. The heat exchanger of the present invention improves the heat exchange problems of traditional heat exchangers and improves the heat exchange efficiency. It reduces the manufacturing cost by controlling the processing difficulty. Its simple structure reduces the assembly requirements and installation difficulty, and also reduces labor cost expenditure. It has great adoption significance and market prospects.

[0031] The above description should not be considered as a limitation of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat exchanger with swirl baffles, characterized in that: The invention comprises a heat exchanger shell (1) which is cylindrical and has an inner cavity and is sealed at both ends, and a head (2) for sealing the heat exchanger shell (1); the heat exchanger shell (1) is provided with a plurality of shell-side pipes (3) for shell-side fluid to flow in and out; a sealing plate (21) is provided between the head (2) and the heat exchanger shell (1); the head (2) is provided with a tube-side pipe (4) for tube-side fluid to flow in and out; the inner cavity of the heat exchanger shell (1) is cylindrical and is provided with a plurality of groups of stepped swirl baffles (6); each group of the swirl baffles (6) is divided into a plurality of small steps (61); each of the small steps (61) is further provided with a through hole (62); the size of the through hole (62) matches the medium pipeline (5) in the heat exchanger and is used to penetrate the medium pipeline (5); and all the small steps (61) are arranged in parallel planes; Each two groups of the swirl baffles (6) are arranged in a "V" shape and their axial projection is a full circle with a plurality of through holes, wherein the through hole (62) is at least one. The axial projection size of each group of the swirl baffles (6) is set according to heat exchange requirements and is at least one half of a perfect circle; The small steps (61) of the swirl baffles (6) are arranged in three layers on a group of swirl baffles (6), the uppermost layer and the lowermost layer of each swirl baffle (6) are provided with a perfect circular and a semi-circular through hole (62), and the middle layer is provided with two perfect circular through holes (62); The outer surface of the medium pipe (5) in the heat exchanger and the inner wall of the heat exchanger shell (1) are provided with spiral grooves (11) along the flow direction of the shell-side fluid, and the spiral angle of the spiral grooves (11) is 60°; the small step (61) of the swirl baffle (6) and the connecting plate between the upper and lower steps are vertically arranged at an angle of 90°.

2. A heat exchanger with swirl baffles according to claim 1, characterized in that: In the heat exchanger, two groups of swirl baffles (6) are connected and used in coordination according to the length of the heat exchanger shell (1).

3. A heat exchanger with swirl baffles according to claim 1, characterized in that: After the swirl baffles (6) are formed by stamping, the two groups of stepped swirl baffles (6) are connected end to end by welding.

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