A heat exchanger
By eliminating the central tube and adopting a coiled tube heat exchanger with a straight tube and expansion joint structure, the high cost problem caused by the central tube was solved, achieving more efficient heat exchange and fluid turbulence, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI CHANGJIAN PETROCHEM EQUIP CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-07-21
AI Technical Summary
In existing wound tube heat exchangers, the presence of a central tube results in high material costs and complex structures, affecting heat exchange area and efficiency.
The central cylinder is eliminated, and straight tubes are used to form a tube column. The tubes are wound inside the shell, and expansion joints are used to reduce thermal stress. Combined with baffles and support structures, fluid disturbance is improved, thereby enhancing heat exchange efficiency.
It reduces equipment weight and production costs, improves heat exchange efficiency, enhances fluid turbulence, and increases the heat transfer coefficient and heat exchange effect.
Smart Images
Figure CN224534831U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heat exchanger technical field, concretely relates to a heat exchanger. BACKGROUND
[0002] The pipe -wound heat exchanger has the advantages such as compact structure, high heat exchange efficiency, strong adaptability, and is widely used in petroleum, chemical industry, energy and other fields. The traditional pipe -wound heat exchanger is usually provided with a center cylinder, and a plurality of layers of winding heat exchange pipes are wound outside the center cylinder. The center cylinder serves to support the winding heat exchange pipes outside. However, the presence of the center cylinder makes it impossible to arrange heat exchange pipes in the area of the center cylinder when arranging the heat exchange pipes, which affects the heat exchange area. For example, the utility model patent with the patent number CN216245714U and the name of a double pipe process pipe -wound heat exchanger includes a center cylinder and a heat exchange pipe, an upper tube box arranged on the top of the upper tube plate, and a lower tube box arranged on the bottom of the lower tube plate. The upper tube box includes an upper tube box cylinder and an upper tube box head. The pipe process inlet is arranged on the upper tube box head, and the pipe process outlet is arranged on the upper tube box cylinder. The pipe process inlet and the upper end of the center cylinder are connected by a pipe. The pipe process medium flows through the center cylinder, effectively utilizes the heat transfer area of the center cylinder, and improves the heat transfer efficiency. Moreover, the lower tube plate is further designed as a floating tube plate, which solves the problem of large temperature difference stress caused by the temperature difference between the pipe and shell process media at the connection between the tube plate and the shell.
[0003] However, the above-mentioned center cylinder is heavy, which increases the material cost. Moreover, the above-mentioned center cylinder needs to be equipped with a floating tube plate to reduce thermal stress, which makes the structure of the above-mentioned pipe -wound heat exchanger more complex, resulting in a higher final production cost. UTILITY MODEL CONTENTS
[0004] The utility model aims at overcoming the above technical defects, and provides a heat exchanger to solve the technical problem of high production cost caused by heat transfer using a center cylinder in the prior art.
[0005] To achieve the above technical purpose, the utility model adopts the following technical scheme:
[0006] The utility model provides a heat exchanger, which comprises a shell and a tube bundle assembly, both ends of the shell are provided with tube plates, the tube bundle assembly is installed in the shell, the tube bundle assembly comprises a tube column and a plurality of winding pipes, both ends of the tube column are communicated with the two tube plates respectively, the tube column comprises a plurality of straight pipes, the straight pipes are arranged in parallel with each other, and the straight pipes are all provided with expansion joints, the winding pipes are filled in the gap between the shell and the tube column and are in a winding state along the length direction of the tube column, and both ends of the winding pipes are communicated with the two tube plates respectively.
[0007] In some embodiments, the expansion joint is in the shape of U.
[0008] In some embodiments, baffles are further included, and the baffles are sleeved on the outer wall of the pipe column.
[0009] In some embodiments, the baffles are in a spiral shape.
[0010] In some embodiments, the spiral angle of the baffles is 5-60°.
[0011] In some embodiments, support rods are fixedly connected between the baffles.
[0012] In some embodiments, the support rods are provided with special-shaped gaskets.
[0013] In some embodiments, the outer wall of the pipe column is provided with support circles, and the support circles are sleeved on the outer wall of the pipe column at intervals.
[0014] In some embodiments, pull rods are fixedly connected between the support circles.
[0015] In some embodiments, the pull rods are provided with flat gaskets.
[0016] Compared with the prior art, the heat exchanger provided by the utility model does not set a center cylinder, reduces the weight and cost of equipment, meanwhile, straight pipes are arranged at the center to form a pipe column, the shell space is effectively utilized, the heat exchange efficiency is improved, further, through the setting of expansion joints, thermal stress can be effectively reduced, without complex structure, the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a structural schematic view of a heat exchanger provided by the utility model embodiment;
[0018] Figure 2 is Figure 1 a structural schematic view of a baffle in the utility model;
[0019] Figure 3 is Figure 1 a structural schematic view of a pipe column in the utility model.
[0020] Mark 1, shell; 11, tube sheet; 2, pipe bundle assembly; 21, pipe column; 211, straight pipe; 212, expansion joint; 213, support circle; 214, pull rod; 215, flat gasket; 22, around pipe; 3, baffle; 31, support rod; 32, special-shaped gasket. DETAILED DESCRIPTION
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.
[0022] To address the technical problem of high production costs caused by using a central cylinder for heat transfer, this invention provides a heat exchanger that can reduce production costs.
[0023] It should be noted that the heat exchanger described in this utility model is used in, but not limited to, wound tube heat exchangers. For ease of explanation, this utility model only uses the application of a heat exchanger in a wound tube heat exchanger as an example. The principle of applying a heat exchanger to other types of equipment is essentially the same as that applied to a wound tube heat exchanger, and will not be elaborated here.
[0024] Please see Figures 1-3 ,in Figure 1 This is a schematic diagram of a heat exchanger according to an embodiment of the present invention. The heat exchanger includes a shell 1 and a tube bundle assembly 2. Tube sheets 11 are installed at both ends of the shell 1. The tube bundle assembly 2 is installed inside the shell 1. The tube bundle assembly 2 includes a tube column 21 and several winding tubes 22. The two ends of the tube column 21 are respectively connected to the two tube sheets 11. The tube column 21 includes several straight tubes 211. The straight tubes 211 are arranged parallel to each other, and each straight tube 211 is provided with an expansion joint 212. Each winding tube 22 fills the gap between the shell 1 and the tube column 21 and is wound along the length direction of the tube column 21. The two ends of the winding tube 22 are respectively connected to the two tube sheets 11.
[0025] In this embodiment, the central cylinder is not provided, which reduces the weight and cost of the equipment. At the same time, a straight pipe 211 is arranged at the center to form a pipe column 21, which effectively utilizes the space of the shell 1 and improves the heat exchange efficiency. Furthermore, the expansion joint 212 can effectively reduce thermal stress without the need for a complex structure, thus reducing production costs.
[0026] Furthermore, the heat exchange tube of the straight tube 211 can be a smooth tube, a spiral corrugated tube, a corrugated tube, or a spiral flat tube, and the heat exchange tube of the wound tube 22 can be a smooth tube, a spiral corrugated tube, or a corrugated tube.
[0027] Preferably, in order to make full use of the space in the center of the housing 1, and to enhance the support strength between the straight tubes 211, the straight tubes 211 are arranged adjacently and fixedly connected without gaps.
[0028] In one embodiment, the expansion joint 212 is U-shaped.
[0029] In this embodiment, the expansion joint 212 is in a U-shape, so that when the device expands thermally, it can counteract the thermal expansion force and reduce thermal stress.
[0030] Furthermore, it can be designed as two small tubes with a thermal expansion device in the middle, the purpose of which is to counteract the thermal expansion force.
[0031] In one embodiment, a baffle plate 3 is also included, and a plurality of baffle plates 3 are provided, each of which is sleeved on the outer wall of the tube column 21.
[0032] In one embodiment, the baffle 3 is spiral-shaped.
[0033] In this embodiment, the baffle plate 3 acts as an internal flow disruptor. When the fluid flows through the straight pipe 211, the baffle plate 3 causes the fluid to flow in a spiral motion and diffuse outward around the pipe 22, stirring the flow channel of the entire shell side of the heat exchanger, changing the flow channel state on the shell side, increasing the turbulence of the fluid, destroying the boundary layer, and increasing the degree of turbulence, thereby improving the heat transfer efficiency and heat transfer coefficient.
[0034] In one embodiment, the helix angle of the baffle 3 is 5°-60°.
[0035] In this embodiment, the baffle 3 can consist of 3, 4 or more pieces, and the specific helix angle is calculated according to different flow rates, different flow velocities, different pressure drop requirements and process calculation formulas.
[0036] Furthermore, the baffle 3 can also be a continuous spiral.
[0037] In one embodiment, a support rod 31 is fixedly connected between each baffle 3.
[0038] In one embodiment, a shaped pad 32 is provided on the support rod 31.
[0039] In this embodiment, the height of the irregularly shaped pad 32 is determined according to the diameter of the winding tube 22 and the flow channel requirements.
[0040] Furthermore, the diameter of the straight pipe 211 is designed according to the required degree of turbulence. The first layer of the winding pipe 22 is directly wound on the straight pipe 211. Through the setting of the support rod 31 and the irregularly shaped pad 32, a uniform flow channel is formed between the winding pipe 22 and the straight pipe 211, ensuring the uniform distribution and smooth flow of the fluid, and further improving the heat exchange efficiency.
[0041] In one embodiment, the outer wall of the column 21 is provided with a plurality of support circles 213, and each support circle 213 is spaced apart and sleeved on the outer wall of the column 21.
[0042] In one embodiment, a strut 214 is fixedly connected between each support circle 213.
[0043] In this embodiment, the support ring is set on the outside of the straight tube 211, and a plurality of tension rods 214 are evenly distributed on the support ring. The number of tension rods 214 is determined according to the diameter of the straight tube 211, the diameter of the winding tube 22, and the winding requirements.
[0044] Furthermore, depending on the heat exchange requirements, the first layer of the coil 22 can be directly wound onto the straight tube 211, or onto the support rod 31 of the outer ring of the baffle 3, or onto the tension rod 214 on the support ring outside the straight tube 211.
[0045] In one embodiment, the strut 214 is provided with a flat pad 215.
[0046] In this embodiment, the thickness of the flat pad 215 is determined according to the support requirements of the winding tube 22.
[0047] It should be noted that the flat gaskets 215 or the irregularly shaped gaskets 32 are arranged alternately around the straight pipe 211 or around the pipe 22, and an irregularly shaped gasket 32 is arranged every few flat gaskets 215. Pipe clamps are welded to the flat gaskets 215 to fix the pipe, while the irregularly shaped gaskets 32 fix the longitudinal spacing of the pipe.
[0048] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail below:
[0049] When the fluid flows through the straight pipe 211, the baffle 3 causes the fluid to flow in a spiral motion, increasing the turbulence of the fluid, breaking the boundary layer, and improving the heat exchange efficiency. At the same time, the fluid diffuses outward into the coiled pipe 22. The first layer of the coiled pipe 22 is wrapped around the straight pipe 211 and, supported by the support rod 31 and the irregularly shaped pad 32, forms a uniform flow channel, ensuring the uniform distribution and turbulent flow of the fluid on the outside and exchanging heat with the fluid on the inside.
[0050] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A heat exchanger, characterized in that, include: A housing, with tube sheets installed at both ends of the housing; as well as A tube bundle assembly is installed inside the housing. The tube bundle assembly includes a tube column and several winding tubes. The two ends of the tube column are respectively connected to two tube sheets. The tube column includes several straight tubes, which are arranged parallel to each other and each straight tube is provided with an expansion joint. Each winding tube fills the gap between the housing and the tube column and is wound along the length direction of the tube column. The two ends of the winding tube are respectively connected to two tube sheets.
2. A heat exchanger according to claim 1, characterized in that, The expansion joint is U-shaped.
3. A heat exchanger according to claim 1, characterized in that, It also includes baffles, of which there are several, and each baffle is fitted onto the outer wall of the tube column.
4. A heat exchanger according to claim 3, characterized in that, The baffle plate is spiral-shaped.
5. A heat exchanger according to claim 4, characterized in that, The helix angle of the baffle is 5°-60°.
6. A heat exchanger according to claim 3, characterized in that, Each of the baffles is fixedly connected to a support rod.
7. A heat exchanger according to claim 6, characterized in that, The support rod is equipped with irregularly shaped pads.
8. A heat exchanger according to claim 1, characterized in that, The outer wall of the tube column is provided with a plurality of support circles, and each support circle is spaced apart and fitted onto the outer wall of the tube column.
9. A heat exchanger according to claim 8, characterized in that, Each of the aforementioned support circles is fixedly connected by a tension rod.
10. A heat exchanger according to claim 9, characterized in that, The bracing rod is equipped with a flat pad.