Special-shaped filler strip for winding pipe type heat exchanger
By designing irregularly shaped gaskets, the problems of gasket damage to heat exchange tubes and limited processing length in wound tube heat exchangers were solved, achieving efficient heat transfer and cost reduction.
Patent Information
- Application Number
- CN202520030513.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-07
AI Technical Summary
The irregularly shaped gaskets in existing spiral wound tube heat exchangers are prone to damaging the heat exchange tubes, resulting in low heat transfer efficiency, limited processing length, and high cost.
Design a special-shaped gasket with the same winding angle as the heat exchange tube. It is a hollow structure with the crest arc parallel to the side arc. The groove fits the heat exchange tube and can be extended indefinitely to adapt to different process requirements.
It improves heat transfer efficiency, protects heat exchange tubes from damage, reduces manufacturing costs, and adapts to various process requirements.
Smart Images
Figure CN223726938U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to heat exchanger technical field, concretely relates to a special-shaped gasket strip for coil-wound heat exchanger. BACKGROUND
[0002] At present, the global industry develops rapidly, and the energy problem becomes increasingly important, and countries not only actively seek new energy, but also pay more attention to the efficient use of energy. Heat exchanger equipment accounts for about 30%-40% in process equipment investment, and if the efficiency of the heat exchanger can be improved, it has great significance for energy saving.
[0003] The coil-wound heat exchanger is widely used in petroleum, chemical industry, metallurgy, pharmacy and other industries to realize energy transfer between materials. Compared with the ordinary tube heat exchanger, it has incomparable advantages. From the heat transfer principle, it belongs to the tube-shell heat exchanger of partition heat transfer, and has wide temperature range, heat shock, heat stress self-elimination, high compactness, high efficiency, energy saving and good waste heat utilization. Due to the special structure, the flow field is fully developed, and there is no flow dead zone. Especially by setting multiple tube passes (single shell pass), the simultaneous heat exchange of multiple fluids in one device can be realized.
[0004] The coil-wound heat exchanger has a special structure, as shown in Figure 1 The heat exchange tubes are layered and wound on the center cylinder, the heat exchange tubes in the same layer are spiral, and the gasket strip is padded between the adjacent heat exchange tubes. The spiral directions of the adjacent two layers of spiral heat exchange tubes are opposite, forming physical isolation between the heat exchange tubes in the same layer, between the heat exchange tube spirals and between different layers. The gasket strip is a special-shaped gasket strip. It is a key positioning element of the heat exchanger, which can ensure that the heat exchanger is manufactured and assembled according to the design requirements, and can also maintain the shape and relative position of the heat exchange tubes under normal working conditions.
[0005] However, the existing special-shaped gasket strip has the following technical problems: it is easy to be damaged in contact with the heat exchange tube during use; the heat exchange efficiency is low; the processing length is limited by the manufacturing process, and the cost is high. SUMMARY
[0006] To solve the above technical problems, the utility model provides a special-shaped gasket strip for coil-wound heat exchanger, which comprises a gasket body, a plurality of parallel structure units are arranged radially in the gasket body, the included angle α between the structure unit and the radial straight line of the gasket body is the same as the winding angle of the heat exchange tube, and the adjacent structure units are spaced.
[0007] The front and back interval distance of the adjacent structure units is 4-6 mm, which is adjusted according to the diameter of the heat exchange pipe.
[0008] The structure unit is a hollow structure.
[0009] The structure unit comprises a wave peak circular arc and side edge arcs arranged on both sides of the wave peak circular arc, the wave peak axis and the wave valley axis of each side edge arc are parallel to each other, the wave peak circular arc angle of the gasket strip is the same as the included angle α, the grooves formed by the arcs of the adjacent structure units are in close contact with the outer wall of the heat exchange pipe, and the front and back intervals between the adjacent structure units are adjusted according to the size of the diameter of the heat exchange pipe.
[0010] The outer surface of the wave peak circular arc and the edge of the side edge arc are smoothly connected.
[0011] The structure units are sequentially stamped and connected on the gasket strip body.
[0012] A heat exchanger comprises a central pipe and a plurality of layers of heat exchange pipes wound outside the central pipe, and a layer of the special-shaped gasket strip is arranged between the central pipe and the innermost layer of heat exchange pipes and between adjacent two layers of heat exchange pipes, and the length direction of the special-shaped gasket strip is parallel to the axis direction of the central pipe.
[0013] The number of the special-shaped gasket strips in each layer is 4-12, and the special-shaped gasket strips are uniformly distributed around the central pipe.
[0014] Compared with the prior art, the special-shaped gasket strip has the following beneficial effects:
[0015] The hollow structure of the special-shaped gasket strip can make the shell side medium fully contact with the heat exchange pipe and improve the heat transfer efficiency. Under the same process conditions, the total manufacturing cost of the equipment can be reduced by using the gasket strip.
[0016] The circular arc angle of the wave peak circular arc is the same as the winding angle calculated according to the process selection of the wound tube heat exchanger, the spiral angle of the wound heat exchange pipe can be closely fitted, that is, the grooves formed by the two side arcs are all in close contact with the outer wall of the heat exchange pipe, the special-shaped gasket strip can be designed according to different process requirements of the wound tube heat exchanger, and the adaptability to the heat exchange pipe is good, so that the linear contact between the heat exchange pipe and the special-shaped gasket strip is avoided, and the heat exchange pipe is effectively protected from damage during use.
[0017] The traditional special-shaped gasket strip is limited by the manufacturing process and has a limited processing length. When the length does not meet the drawing requirements, the gasket strip needs to be spliced and welded to meet the drawing requirements. The special-shaped gasket strip of the utility model is not limited by the manufacturing process, and the processing length can be infinitely long, and the manufacturing cost is low. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 The wound tube heat exchanger structure is used.
[0019] Figure 2 This is a schematic diagram of the irregularly shaped gasket used in the spiral wound tube heat exchanger in Example 1;
[0020] Among them, 1 is the pad strip body, 2 is the structural unit, 3 is the crest arc, 4 is the side arc, 5 is the crest axis, and 6 is the trough axis. Detailed Implementation
[0021] Example 1
[0022] like Figure 2 As shown, a special-shaped gasket for a wound tube heat exchanger includes a gasket body 1. Several parallel structural units 2 are radially stamped onto the gasket body 1. Each structural unit 2 is hollow. The included angle α between the structural unit 2 and the radial line of the gasket body 1 is the same as the winding angle of the heat exchange tube. There is a front-to-back gap between adjacent structural units, with a gap distance of 4-6 mm, adjusted according to the diameter of the heat exchange tube. Each structural unit 2 includes a crest arc 3 and side arcs 4 located on both sides of the crest arc 3. The crest axis 5 and trough axis 6 of each side arc 4 are parallel to each other. The arc angle of the crest arc 3 is the same as the included angle α, i.e., the same as the winding angle calculated for the wound tube heat exchanger process. The groove formed by the arcs of adjacent structural units fits against the outer wall of the heat exchange tube. The outer surface of the crest arc 3 smoothly transitions to the edge of the side arc 4.
[0023] A heat exchanger includes a central tube and multiple layers of heat exchange tubes wound around the outside of the central tube. A layer of the aforementioned shaped gasket is provided between the central tube and the innermost heat exchange tube, and between adjacent layers of heat exchange tubes. The length direction of the shaped gasket is parallel to the axial direction of the central tube. Each layer contains 4-12 shaped gaskets, evenly distributed around the central tube.
Claims
1. A profiled gasket strip for use in a spiral wound heat exchanger, characterised in that: The gasket strip body (1) is radially arranged with a plurality of parallel structural units (2) in sequence, the included angle α between the structural unit (2) and the radial straight line of the gasket strip body (1) is the same as the winding angle of the heat exchange pipe, and the adjacent structural units (2) are spaced in front and back; the structural unit (2) comprises a wave crest circular arc (3) and side edge arcs (4) arranged on both sides of the wave crest circular arc, the wave crest axis (5) and the wave trough axis (6) of each side edge arc (4) are parallel to each other, the circular arc angle of the wave crest circular arc (3) is the same as the included angle α, and the grooves formed by the side edge arcs (4) of the adjacent structural units (2) are attached to the outer wall of the heat exchange pipe.
2. A profiled gasket strip for a spiral pipe heat exchanger as claimed in claim 1, characterized in that: The structural unit (2) is a hollow structure.
3. A profiled gasket strip for a spiral pipe heat exchanger as claimed in claim 1, characterized in that: The outer surface of the wave crest circular arc (3) and the edge of the side edge arc (4) are smoothly connected.
4. A profiled gasket strip for a spiral pipe heat exchanger according to any one of claims 1-2, characterized in that: The structural unit (2) is connected to the gasket strip body in sequence by stamping.
5. A heat exchanger comprising a central tube and a plurality of heat exchange tubes wound outside the central tube, characterized in that: A layer of the profiled gasket strip according to any one of claims 1-2 is arranged between the central pipe and the innermost layer of heat exchange pipes, and between the adjacent two layers of heat exchange pipes, and the length direction of the profiled gasket strip is parallel to the axis direction of the central pipe.
6. The heat exchanger of claim 5, wherein: The number of profiled gasket strips in each layer is 4-12, and they are uniformly distributed around the central pipe.