A head for a plate-fin heat exchanger

Abstract

The utility model discloses a kind of head for plate-fin heat exchanger, it is related to plate-fin heat exchanger technical field, including head body, head body is connected with inflow pipeline;The inflow direction of inflow pipeline is perpendicular to the inflow direction of flow passage;The inside of head body is equipped with cavity;The side of head body towards flow passage is equipped with through opening;Through opening is communicated with cavity and flow passage;Through opening is equipped with shunt plate;Shunt plate covers the opening area of through opening;Shunt plate is evenly divided into several shunt areas;Shunt area is vertically arranged;Several shunt areas are sequentially arranged along the inflow direction of inflow pipeline;Shunt area is equipped with several through holes;Several through holes are sequentially arranged along straight line;In the inflow direction of inflow pipeline, the aperture of the through hole of several shunt areas gradually increases.The head for plate-fin heat exchanger provided by the utility model gradually increases the through hole aperture of entering flow passage in the fluid flow direction in cavity, realizes that fluid evenly enters flow passage, and effectively improves heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the field of plate-fin heat exchanger technology, and in particular to a head for plate-fin heat exchangers. Background Technology

[0002] In a plate-fin heat exchanger, the end caps serve as the entry and exit points for fluid into the plate bundle. The uniformity of fluid distribution within the flow channels from the end caps into the plate bundle is crucial. If the fluid rushes into the flow channels too quickly upon entering the end caps, it will result in uneven fluid distribution. Excessive fluid flow in some channels leads to insufficient heat exchange time, while insufficient flow in others prevents adequate heat exchange, resulting in energy waste and decreased equipment performance. In actual operation of plate-fin heat exchangers, the slower fluid velocity in the rear half of the end cap causes a greater flow rate in the corresponding area of ​​the front half than in the rear half, significantly reducing heat exchange efficiency.

[0003] Chinese utility model patent application number 202223391530.2 discloses a plate-fin heat exchanger head that can uniformly distribute two-phase fluids. Although this patent can uniformly mix the two fluids, the inlet is located at the bottom of the head structure. This results in a faster fluid velocity near the inlet and a slower fluid velocity further away from the inlet, causing inconsistent flow rates at different locations in the flow channel. This prevents the fluid from entering the flow channel uniformly, negatively impacting the heat exchanger's heat exchange efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a head for a plate-fin heat exchanger. By gradually increasing the diameter of the through hole in the flow channel in the direction of fluid flow in the cavity, the flow rate of high-speed fluid entering the flow channel at the beginning of the cavity is reduced, while the flow rate of low-speed fluid entering the pipe at the rear of the cavity is increased, so as to achieve uniform fluid entry into the flow channel and effectively improve the heat exchange efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a head for a plate-fin heat exchanger, comprising a head body connected to an inlet pipe; the inlet direction of the inlet pipe is perpendicular to the inlet direction of the flow channel; the head body has an internal cavity; an opening is provided on the side of the head body facing the flow channel; the opening connects the cavity and the flow channel; a flow divider is provided on the opening; the flow divider covers the opening area of ​​the opening; the flow divider is evenly divided into several flow divider zones; the flow divider zones are arranged vertically; the several flow divider zones are arranged sequentially along the inlet direction of the inlet pipe; the flow divider zones have several through holes; the several through holes are arranged sequentially along a straight line; in the inlet direction of the inlet pipe, the diameter of the through holes in the several flow divider zones gradually increases.

[0006] The end cap for a plate-fin heat exchanger provided by this utility model preferably has a flow-damping plate at the boundary of each group of adjacent flow-dividing zones; the flow-damping plate is located on the side of the flow-dividing plate facing away from the flow channel; the flow-damping plate extends into the cavity, and there is a gap between the extended end of the flow-damping plate and the inner wall of the cavity facing the flow-dividing plate for fluid passage; the flow-damping plate is inclined along the inlet direction of the inlet pipe.

[0007] The end cap for a plate-fin heat exchanger provided by this utility model preferably has a plurality of flow-retarding plates with an increasing inclination angle in the flow direction of the inlet pipe.

[0008] The end cap for a plate-fin heat exchanger provided by this utility model preferably has a flow-retardant plate with an angle of less than or equal to 45° between it and the flow-dividing plate in the flow direction of the inlet pipe.

[0009] The above technical solution has the following advantages or beneficial effects: This utility model provides a head for a plate-fin heat exchanger, relating to the field of plate-fin heat exchanger technology, including a head body connected to an inlet pipe; the inlet direction of the inlet pipe is perpendicular to the inlet direction of the flow channel; the head body has an internal cavity; the head body has an opening on the side facing the flow channel; the opening connects the cavity to the flow channel; the opening is provided with a flow divider plate; the flow divider plate covers the opening area of ​​the opening; the flow divider plate is evenly divided into several flow divider zones; the flow divider zones are vertically arranged; the several flow divider zones are arranged sequentially along the inlet direction of the inlet pipe; the flow divider zones have several through holes; the several through holes are arranged sequentially along a straight line; in the inlet direction of the inlet pipe, the diameter of the through holes in the several flow divider zones gradually increases. This utility model provides a head for a plate-fin heat exchanger. By gradually increasing the diameter of the through hole entering the flow channel in the direction of fluid flow within the cavity, the flow rate of high-speed fluid entering the flow channel at the very beginning of the cavity is reduced, while the flow rate of low-speed fluid entering the pipe at the rear of the cavity is increased. This achieves uniform fluid entry into the flow channel and effectively improves heat exchange efficiency. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0011] Figure 1 This is an overall structural diagram of a head for a plate-fin heat exchanger provided in Embodiment 1 of this utility model; Figure 2 This is an internal structural diagram of a head for a plate-fin heat exchanger provided in Embodiment 1 of this utility model; Figure 3 A top cross-sectional view of a head for a plate-fin heat exchanger provided in Embodiment 1 of this utility model; Figure 1-3Includes: 1. Head body; 11. Inlet pipe; 12. Port; 2. Diverter plate; 21. Through hole; 22. Flow buffer plate. Detailed Implementation

[0012] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0013] Example 1: When fluid first enters the head, if the velocity is too high and it rushes directly into the flow channel, it will cause uneven fluid distribution. In some flow channels, the fluid flow rate is too high, resulting in insufficient heat exchange time, while in other flow channels, the fluid flow rate is too low, failing to fully participate in heat exchange, leading to energy waste and a decline in equipment performance. In the actual operation of plate-fin heat exchangers, because the fluid velocity slows down in the rear half of the head used for fluid entry, the flow rate in the corresponding area of ​​the front half of the flow channel is greater than that in the rear half, resulting in a significant reduction in heat exchange efficiency.

[0014] like Figure 1-3 As shown: In existing technology, the end cap body 1 is generally positioned directly opposite and fastened to the inlet and outlet of the flow channel, while the inlet pipe 11 is located on the side of the end cap body 1. This results in the fluid always entering the cavity of the end cap body 1 from the side. The fluid velocity is relatively high when it first enters the cavity, causing a higher fluid flow rate in the flow channel near the inlet pipe 11. However, as the fluid flows deeper into the cavity, the velocity decreases, thus reducing the corresponding flow rate. This leads to different fluid flow rates in different areas of the flow channel, with areas having excessively high flow rates failing to fully participate in heat exchange, reducing heat exchange efficiency.

[0015] To solve the above-mentioned technical problems, this utility model provides a head for a plate-fin heat exchanger, including a head body 1, the head body 1 being connected to an inlet pipe 11; the inlet direction of the inlet pipe 11 is perpendicular to the inlet direction of the flow channel; the head body 1 has an internal cavity; the head body 1 has an opening 12 on the side facing the flow channel; the opening 12 connects the cavity to the flow channel; the opening 12 is provided with a flow divider plate 2; the flow divider plate 2 covers the opening area of ​​the opening 12; the flow divider plate 2 is evenly divided into several flow divider zones; the flow divider zones are arranged vertically; the several flow divider zones are arranged sequentially along the inlet direction of the inlet pipe 11; the flow divider zones have several through holes 21; the several through holes 21 are arranged sequentially along a straight line; in the inlet direction of the inlet pipe 11, the diameter of the through holes 21 in the several flow divider zones gradually increases.

[0016] When the end cap provided by this utility model for a plate-fin heat exchanger is in operation, the fluid to be exchanged flows into the cavity of the end cap body 1 from the inlet pipe 11. As the fluid continuously flows towards the rear of the cavity, it flows through several flow distribution zones on the flow distribution plate 2 in sequence. Each flow distribution zone is provided with a through hole 21, through which the fluid finally flows into the flow channel.

[0017] In the above process, fluid flows into the flow channel from the inlet 12. Since the flow rate of the fluid entering the cavity is relatively large, through holes 21 with different diameters are provided. As the fluid passes through the through holes 21, the smaller the diameter of the through hole 21, the greater the resistance encountered by the fluid. Therefore, the diameter of several through holes 21 on the flow divider 2 is continuously increased in the inflow direction of the inlet pipe 11, so that the resistance encountered by the fluid entering the flow channel varies in different areas of the cavity. By reducing the flow rate in the flow channel near the inlet pipe 11 and increasing the flow rate in the flow channel away from the inlet pipe 11, the flow rate in the flow channel can be made more uniform, preventing areas with excessively high flow rates from failing to effectively exchange heat, thus effectively increasing the overall heat exchange efficiency.

[0018] The end cap provided by this utility model for a plate-fin heat exchanger gradually increases the diameter of the through hole 21 entering the flow channel in the direction of fluid flow within the cavity, thereby reducing the flow rate of high-speed fluid entering the flow channel at the beginning of the cavity and increasing the flow rate of low-speed fluid entering the pipe at the rear of the cavity, thus achieving uniform fluid entry into the flow channel and effectively improving heat exchange efficiency.

[0019] Because the fluid flowing out of the inlet pipe 11 directly impacts the flow divider plate 2 within the cavity, and because the fluid near the inlet pipe 11 has higher kinetic energy, even with a small-diameter through-hole 21, a relatively large flow rate still passes through. To eliminate the influence of fluid kinetic energy on the flow rate through the through-hole 21, in a preferred embodiment, a flow-damping plate 22 is provided at the boundary of each group of adjacent flow divider zones; the flow-damping plate 22 is located on the side of the flow divider plate 2 facing away from the flow channel; the flow-damping plate 22 extends into the cavity, and there is a gap between the extended end of the flow-damping plate 22 and the inner wall of the cavity opposite to the flow divider plate 2 for fluid passage; the flow-damping plate 22 is inclined along the inlet direction of the inlet pipe 11.

[0020] The inclined flow deflector 22 can block the through hole 21, preventing the fluid from directly impacting the through hole 21. The flow deflector 22, which is inclined in the direction of flow, can prevent the fluid from losing too much kinetic energy due to excessive resistance, thus preventing it from affecting the flow rate in the flow channel.

[0021] In a preferred embodiment, the inclination angle of several flow-damping plates 22 in the inlet direction of the inlet pipe 11 gradually increases. The larger the inclination angle of the flow-damping plates 22, the smaller the resistance to the fluid, which can ensure that the fluid entering the flow channel at the rear of the cavity has sufficient flow to ensure heat exchange efficiency.

[0022] In a preferred embodiment, the angle between the flow-slowing plate 22 and the flow-dividing plate 2 in the flow direction of the inlet pipe 11 is less than or equal to 45°.

[0023] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application filed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not claimed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

[0024] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A head for a plate-fin heat exchanger, characterized in that, The device includes a head body connected to an inlet pipe; the inlet direction of the inlet pipe is perpendicular to the inlet direction of the flow channel; the head body has an internal cavity; an opening is provided on the side of the head body facing the flow channel; the opening connects the cavity to the flow channel; a flow divider plate is provided on the opening; the flow divider plate covers the opening area of ​​the opening; the flow divider plate is evenly divided into several flow divider zones; the flow divider zones are vertically arranged; the several flow divider zones are arranged sequentially along the inlet direction of the inlet pipe; each flow divider zone has several through holes; the several through holes are arranged sequentially along a straight line; the diameter of the through holes in the several flow divider zones gradually increases along the inlet direction of the inlet pipe.

2. The head for a plate-fin heat exchanger according to claim 1, characterized in that, A flow-damping plate is provided at the boundary of each group of adjacent flow-dividing zones; the flow-damping plate is located on the side of the flow-dividing plate facing away from the flow channel; the flow-damping plate extends into the cavity, and there is a gap between the extended end of the flow-damping plate and the inner wall of the cavity facing the flow-dividing plate for fluid passage; the flow-damping plate is inclined along the inlet direction of the inlet pipe.

3. The end cap for a plate-fin heat exchanger according to claim 2, characterized in that, The inclination angle of several of the flow-damping plates gradually increases in the flow direction of the inlet pipe.

4. The end cap for a plate-fin heat exchanger according to claim 2, characterized in that, The angle between the flow-slowing plate and the flow-dividing plate in the flow direction of the inlet pipe is less than or equal to 45°.

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