Energy-saving plate-fin heat exchanger liquid uniform distribution device and heat exchanger

Abstract

The invention discloses an energy-saving plate-fin heat exchanger liquid uniform distribution device and a heat exchanger, and relates to the technical field of heat exchangers, the energy-saving plate-fin heat exchanger liquid uniform distribution device comprises an end socket and a liquid inlet pipe communicated with the top of the end socket, and further comprises a central liquid distribution plate which is fixed in the end socket and located below the liquid inlet pipe, and liquid distribution wing plates are hinged to the two sides of the central liquid distribution plate respectively; the liquid distribution wing plates are hinged to the two sides of the interior of the end socket respectively, the free ends of the liquid distribution wing plates are in lap joint with the top faces of the flow distribution wing plates, the flow distribution cavities are formed in the two sides of the interior of the end socket respectively, and adjusting assemblies are arranged in the flow distribution cavities. The central liquid distribution plate is arranged to receive fluid falling from the liquid inlet pipe, preliminary flow distribution is achieved, the fluid is prevented from directly impacting the interior of the end socket, the free end of the liquid distribution wing plate is in lap joint with the top face of the flow distribution wing plate, and a linkage type flow guide structure is formed; and the adjusting assembly in the flow dividing cavity can drive the flow dividing wing plate and the liquid distributing wing plate to synchronously rotate to lift up or fall down according to the change of the liquid inlet flow.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically to an energy-saving plate-fin heat exchanger liquid distribution device and heat exchanger. Background Technology

[0002] Plate-fin heat exchangers are widely used in chemical, refrigeration, aerospace and other fields due to their compact structure, high heat transfer efficiency and small footprint. The uniformity of fluid flow distribution has a crucial impact on the performance of heat exchangers.

[0003] The existing patent application, with publication number CN118565249A and publication date August 30, 2024, is titled "A Trapezoidal Guide Plate Head for a Plate-Fin Heat Exchanger and a Plate-Fin Heat Exchanger." This patent includes a head shell, the head shell being trapezoidally shaped, with an inlet pipe fixedly connected to its top surface, and the inlet pipe communicating with the head shell. A guide plate assembly is fixedly connected to the bottom end of the inlet pipe, and the two sides of the guide plate assembly are fixedly connected to the inner wall of the head shell. This invention, through the coordinated arrangement of the guide plate assembly, guide fins, baffles, and other structures, can multiple times divert the fluid entering through the inlet pipe, resulting in a more uniform fluid distribution within the finned channel layer of the heat exchanger. This effectively improves the heat transfer performance of the heat exchanger, offering superior performance compared to traditional heads. It provides a more reliable solution for engineering design and application fields, saving energy and improving system efficiency.

[0004] The aforementioned application has shortcomings. The diversion angle and flow channel size of the components used for diversion cannot be dynamically adjusted according to changes in the actual liquid inflow rate. In actual industrial scenarios, the liquid inflow rate of the heat exchanger often changes due to fluctuations in production load. When the flow rate increases, the diversion capacity of the fixed structure cannot be increased synchronously, leading to increased fluid impact force. Some fluid may even directly impact the inner walls on both sides of the head, making it impossible to achieve stable and uniform diversion. When the flow rate decreases, the fixed channel will cause the fluid velocity to be too slow, easily resulting in fluid stagnation, which also affects the uniform distribution effect. At high flow rates, the fluid... Due to inertia, the fluid tends to shift towards both sides of the head, resulting in a larger flow rate on both sides and a smaller flow rate in the middle, forming a significant local flow deviation. This prevents the finned channels in the core heat exchange area of ​​the heat exchanger from being fully and uniformly utilized, limiting the improvement of heat transfer efficiency and failing to fully realize the energy-saving potential. When the influent flow rate increases sharply, the high-speed fluid directly impacts the fixed guide plate assembly. On the one hand, this generates a large impact force, which aggravates the wear of the guide structure and reduces the service life of the equipment. On the other hand, the turbulence generated by the impact will disrupt the stability of the flow distribution, causing the fluid to form irregular vortices inside the head, further deteriorating the uniform distribution effect. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-saving plate-fin heat exchanger liquid distribution device and heat exchanger to overcome the shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An energy-saving plate-fin heat exchanger liquid distribution device includes a head and an inlet pipe connected to the top of the head, a central distribution plate fixed inside the head and located below the inlet pipe, distribution vanes hinged to both sides of the central distribution plate, a pair of diversion vanes hinged to both sides inside the head, the free ends of the distribution vanes overlapping the top surfaces of the diversion vanes, and a pair of diversion cavities located on both sides inside the head. Each diversion cavity has a diversion port at one end, and its bottom is inclined and fitted with a drain filter screen located above the distribution vanes. An adjustment component is provided inside the diversion cavity, with its bottom slidably connected to the diversion vanes. When the flow rate in the inlet pipe increases, the adjustment component simultaneously lifts the diversion vanes and the distribution vanes, increasing the fluid flow area of ​​the diversion cavities.

[0008] Preferably, a plurality of horizontally distributed flexible speed bumps are installed on the flow divider, the flexible speed bumps are filled with a shear-thickening fluid, the flexible speed bumps are spaced apart along the length of the flow divider, and the shear-thickening fluid is a non-Newtonian fluid whose viscosity varies with the shear rate.

[0009] Preferably, both the liquid distribution vane and the flow divider vane are provided with multiple mesh holes, the mesh hole size gradually increases along the fluid flow direction, and a liquid distribution mesh is embedded in the opening at the bottom of the end cap.

[0010] Preferably, two sets of staggered buffer columns are provided above the central liquid distribution plate, and the two sets of buffer columns are arranged in an isosceles trapezoid.

[0011] Preferably, the adjustment assembly includes a movable seat that is slidably connected to the top of the inner wall of the diversion cavity. An adjustment screw is threaded through the movable seat. One end of the adjustment screw is rotatably connected to the inner wall of the diversion cavity, and the other end passes through the side wall of the end cap and is connected to a drive motor. A traction frame is fixedly connected to the bottom of the movable seat, and a guide rail that slides with the bottom of the traction frame is symmetrically fixedly connected to the top surface of the diversion vane.

[0012] Preferably, a crossbar is vertically slidably installed inside the traction frame, and a cleaning brush is installed at the bottom of the crossbar, with the bristles of the cleaning brush in contact with the drain filter.

[0013] Preferably, both sides of the end cap are equipped with maintenance doors that communicate with the diversion cavity. The inner walls of the diversion cavity are respectively provided with guide grooves for inserting the ends of the crossbars. The guide grooves have inclined sections and horizontal sections. The inclined sections are parallel to the drain filter screen, and the horizontal sections are connected to the ends of the inclined sections near the maintenance doors.

[0014] Preferably, the top surface of the liquid distribution vane is provided with a plurality of receiving grooves along the liquid flow direction, and a flow-blocking baffle is hinged in the receiving groove. Both ends of the flow-blocking baffle are fixedly connected to a cam. The inner wall of the end cap is provided with an arc-shaped groove for the cam to be inserted, and the inner wall of the arc-shaped groove is provided with an abutting protrusion that cooperates with the cam.

[0015] Preferably, a dividing frame is fixedly connected inside the diversion port, and a self-closing valve plate is elastically installed on one side of the dividing frame located inside the diversion cavity.

[0016] A heat exchanger includes the above-mentioned energy-saving plate-fin heat exchanger liquid distribution device.

[0017] In the above technical solution, a central liquid distribution plate is set to receive the fluid falling from the inlet pipe, achieving initial diversion and preventing the fluid from directly impacting the inside of the end cap. The free end of the liquid distribution vane overlaps the top surface of the diversion vane, forming a linked flow guiding structure. This allows the adjustment component in the diversion cavity to drive the diversion vane and the liquid distribution vane to rotate synchronously and rise or fall according to changes in the inlet flow rate. When the inlet pipe flow rate increases, the adjustment component will drive the diversion vane and the liquid distribution vane to rise simultaneously. On the one hand, the adjustment of the adjustment component will increase the fluid flow area of ​​the diversion cavity, improving the diversion capacity to adapt to high flow conditions. On the other hand, the bottom of the diversion cavity and the liquid distribution vane... The cross-section of the formed flow channel gradually decreases along the direction of water flow. This tapered channel design guides the liquid to flow smoothly along the channel, with the flow velocity increasing slowly rather than abruptly, forming a stable pressure gradient. It guides the fluid to spread evenly along the width of the channel. The tapered channel suppresses the generation of turbulence and irregular eddies. After the liquid distribution vanes and flow divider vanes are raised, they form a gentle guiding slope, which effectively weakens the impact force of the fluid and prevents the liquid from rapidly impacting both sides of the head. It can precisely control the fluid distribution ratio between the sides and the middle area, solve the problem of local flow deviation, and make the fluid evenly cover all fin channels of the heat exchanger, which can greatly improve the heat transfer efficiency.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0019] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of an energy-saving plate-fin heat exchanger liquid distribution device according to the present invention.

[0022] Figure 2 This is an overall sectional view of an energy-saving plate-fin heat exchanger liquid distribution device according to the present invention.

[0023] Figure 3 In this invention Figure 2 Enlarged view of the structure at point A;

[0024] Figure 4 This is a schematic diagram of the internal structure of the end cap in an energy-saving plate-fin heat exchanger liquid distribution device of the present invention.

[0025] Figure 5 This is a schematic diagram showing the distribution of liquid distribution fins and flow divider fins in an energy-saving plate-fin heat exchanger liquid distribution device of the present invention.

[0026] Figure 6 This is a schematic diagram of the regulating component and the flow distribution cavity in an energy-saving plate-fin heat exchanger liquid distribution device of the present invention;

[0027] Figure 7 This is a schematic diagram of the transmission of the regulating component and the flow-dividing wing plate in the liquid distribution device of an energy-saving plate-fin heat exchanger according to the present invention.

[0028] Figure 8 This is a schematic diagram of the regulating component in an energy-saving plate-fin heat exchanger liquid distribution device of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. End cap; 101. Inlet pipe; 102. Inspection chamber door; 103. Arc groove; 104. Abutment protrusion; 2. Central liquid distribution plate; 201. Buffer column; 3. Liquid distribution vane; 301. Mesh; 302. Receiving tank; 303. Flow-blocking baffle; 304. Cam; 4. Diverter vane; 401. Guide rail; 5. Flexible speed reduction belt; 6. Diverter chamber; 601. Diverter port; 602. Drainage filter; 603. Guide groove; 604. Divider frame; 605. Self-closing valve plate; 7. Adjustment assembly; 701. Moving seat; 702. Adjusting screw; 703. Drive motor; 704. Pulling frame; 705. Crossbar; 706. Cleaning brush; 8. Liquid distribution net. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0032] Please see Figure 1-8 This invention provides an energy-saving plate-fin heat exchanger liquid distribution device, including a head 1 and an inlet pipe 101 connected to the top of the head 1. It also includes a central liquid distribution plate 2, fixed inside the head 1 and located below the inlet pipe 101. Liquid distribution vanes 3 are hinged to both sides of the central liquid distribution plate 2. A pair of diversion vanes 4 are hinged to both sides inside the head 1. The free ends of the liquid distribution vanes 3 overlap the top surfaces of the diversion vanes 4. A pair of diversion cavities 6 are located on both sides inside the head 1. One end of each diversion cavity 6 has a diversion port 601. The bottom of the diversion cavity 6 is inclined and has a drain filter 602 embedded above the liquid distribution vanes 3. An adjustment component 7 is provided inside the diversion cavity 6. The bottom of the adjustment component 7 is slidably connected to the diversion vanes 4. When the flow rate of the inlet pipe 101 increases, the adjustment component 7 drives the diversion vanes 4 and the liquid distribution vanes 3 to lift simultaneously, increasing the fluid flow area of ​​the diversion cavity 6.

[0033] Specifically, the end cap 1 has a hollow cavity structure with a mounting hole at the center of its top. The liquid inlet pipe 101 is fixed to this mounting hole by welding. The liquid inlet pipe 101 is connected to the internal cavity of the end cap 1 and is used to supply the liquid to be exchanged into the end cap 1. The central liquid distribution plate 2 is located directly below the liquid inlet pipe 101, ensuring that the fluid falling from the liquid inlet pipe 101 falls completely onto the central liquid distribution plate 2. Two liquid distribution vanes 3 are symmetrically distributed on both sides of the central liquid distribution plate 2. The end of the liquid distribution vane 3 closest to the central liquid distribution plate 2 is hinged to the central liquid distribution plate 2, allowing the vane 3 to rotate up and down around the hinge point. The flow distribution cavity 6 inside the end cap 1 has an inlet 601 facing the central area and an outlet... The outlet is located at the bottom of the diversion chamber 6, where the drain filter 602 is located. When the flow rate is low, the liquid flowing out of the inlet pipe 101 impacts the central distribution plate 2 and spreads to the two side distribution vanes 3. After being guided by the surface of the distribution vanes 3, it flows to the diversion vane 4 at the overlap. At this time, the flow rate entering the diversion chamber 6 is low, and both the diversion vane 4 and the distribution vane 3 maintain a normal tilt posture. The effective flow area of ​​the diversion chamber 6 is also small, and the system operates in basic mode. When the flow rate of the inlet pipe 101 increases, the diversion vane 4 connected to it is adjusted by moving the adjustment component 7, forcing the diversion vane 4 to rotate upward around its hinge axis and lift. Due to the free movement of the distribution vane 3... The end rests on the diversion vane 4. The lifting action of the diversion vane 4 simultaneously lifts the free end of the liquid distribution vane 3, causing the liquid distribution vanes 3 on both sides to rotate upward around their hinge axis with the central liquid distribution vane 2. As a result, the inclination angle of the entire guide surface becomes gentler. At the same time, since the bottom of the diversion cavity 6 is inclined, the adjustment of the adjustment component 7 is equivalent to increasing the flow cross-sectional area of ​​the diversion cavity 6, so that its diversion and discharge capacity matches the increased total inlet flow rate, preventing liquid from accumulating in the middle of the end cap 1. After the liquid distribution vane 3 is lifted upward, a gradually narrowing flow channel with a cross-sectional area that gradually shrinks along the main flow direction is formed between its lower surface and the fixed bottom surface of the diversion cavity 6 below. The fluid flows through this gradually narrowing flow channel. When the flow rate increases steadily and continuously, a stable and uniform pressure gradient field is formed in the flow channel. This pressure gradient strongly guides the fluid to spread evenly along the entire width of the head 1, effectively suppressing the fluid from excessively concentrating to both sides or generating separation vortices due to inertia. Finally, after the final rectification and micro-distribution of the flow channel, the liquid is ensured to be evenly sprayed on all the fin channel inlet sections of the heat exchanger core below. When the inlet flow rate decreases, the regulating component 7 is reset, driving the flow divider wing plate 4 and the liquid distribution wing plate 3 to rotate downward synchronously, gradually returning to the posture at low flow rate. The flow area of ​​the flow divider cavity 6 is also reduced accordingly, so as to restart operation in the basic mode.

[0034] Compared with the prior art, this embodiment of the invention achieves preliminary diversion by setting a central liquid distribution plate 2 to receive the fluid falling from the liquid inlet pipe 101, thus avoiding direct impact of the fluid on the interior of the end cap 1. The free end of the liquid distribution vane 3 overlaps the top surface of the diversion vane 4, forming a linked flow guiding structure. This allows the adjustment component 7 in the diversion cavity 6 to drive the diversion vane 4 and the liquid distribution vane 3 to rotate synchronously and rise or fall according to the change in the inlet flow rate. When the flow rate of the inlet pipe 101 increases, the adjustment component 7 will drive the diversion vane 4 and the liquid distribution vane 3 to rise simultaneously. On the one hand, the adjustment of the adjustment component 7 will increase the fluid flow area of ​​the diversion cavity 6, improve the diversion capacity to adapt to high flow conditions, and on the other hand, the diversion... The cross-section of the flow channel formed between the bottom of cavity 6 and the liquid distribution vane 3 gradually decreases along the direction of water flow. This tapered channel design guides the liquid to flow smoothly along the channel, with the flow velocity increasing slowly rather than abruptly, forming a stable pressure gradient. It guides the fluid to spread evenly along the width of the channel. The tapered channel suppresses the generation of turbulence and irregular eddies. After the liquid distribution vane 3 and the flow divider 4 are raised, they form a gentle guiding slope, which effectively weakens the impact force of the fluid and prevents the liquid from rapidly impacting both sides of the head 1. It can accurately control the fluid distribution ratio between the sides and the middle area, solve the problem of local flow deviation, and make the fluid evenly cover all the fin channels of the heat exchanger, which can greatly improve the heat transfer efficiency.

[0035] In a further embodiment of the present invention, a plurality of horizontally distributed flexible speed bumps 5 are installed on the flow divider 4. The flexible speed bumps 5 are filled with a shear-thickening fluid. The flexible speed bumps 5 are spaced apart along the length of the flow divider 4. The shear-thickening fluid is a non-Newtonian fluid whose viscosity varies with the shear rate. Specifically, the flexible speed bump 5 is a hollow strip structure with an outer shell made of silicone rubber, firmly attached to the surface of the flow divider 4. Its internal cavity is completely filled with the shear-thickening fluid, which is a typical non-Newtonian fluid whose apparent viscosity varies with the shear rate. The externally applied shear rate changes significantly. At low shear rates, such as when the fluid flows slowly, it exhibits a low-viscosity fluid state and is easily deformable. However, at high shear rates, such as when the fluid impacts or scours at high speeds, its viscosity increases sharply, and the resistance increases dramatically. When the flow rate in the inlet pipe 101 is small, the fluid flows smoothly over the surface of the distributor vane 4. At this time, the shear rate applied to the flexible deceleration belt 5 is low, and the internal shear-thickening fluid remains in a low-viscosity liquid state. The flexible deceleration belt 5 is in a soft and easily deformable state, generating additional flow resistance to the fluid. The effect is minimal, having almost no significant impact on the spreading and guiding of the liquid by the distributor vane 3. However, as the flow rate increases, the velocity, kinetic energy, and shear force of the liquid flowing across the surface of the distributor vane 4 increase dramatically. The high-shear-force liquid flow acts on the flexible deceleration band 5, causing the shear-thickening fluid inside to instantly experience extremely high shear rates, thus triggering the shear-thickening effect. The fluid viscosity increases dramatically, causing the entire deceleration band to instantly change from a soft state to a locally hard state. These instantaneously hardened deceleration bands play a crucial role in local flow regulation. The raised, hardened deceleration bands contribute to the formation of high-speed liquid layers. Significant local resistance effectively consumes excess kinetic energy of the liquid flow, forcibly reducing its tangential velocity along the surface of the splitter vane 4, preventing the liquid from splashing, detaching from the wall, or forming a destructive jet due to excessive speed. While consuming the downward kinetic energy of the fluid, the deceleration belt's physical blocking effect converts some of the fluid's kinetic energy into diffusion power along the width of the vane, and disrupts large-scale vortices that may cause unevenness, refining the flow field structure. This more effectively guides and forces the liquid to spread evenly to both sides, which enhances the uniformity and stability of the liquid film distribution under high flow rates.

[0036] In a further embodiment of the present invention, multiple mesh holes 301 are provided on both the liquid distribution vane 3 and the flow divider vane 4. The size of the mesh holes 301 gradually increases along the fluid flow direction. A liquid distribution net 8 is horizontally embedded at the opening at the bottom of the end cap 1. Specifically, the multiple mesh holes 301 on the liquid distribution vane 3 and the flow divider vane 4 are smaller upstream and gradually larger downstream. The graded discharge formed by the gradually increasing mesh holes 301 can continuously and adaptively thin and unload the liquid film, fundamentally curbing the flow instability caused by the thickening and acceleration of the liquid film. This ensures that no matter how the flow rate changes, the liquid film flowing through the vane surface can maintain laminar or highly ordered laminar flow with excellent stability. After the fluid is initially dispersed by the liquid distribution vane 3 and the flow divider vane 4, it flows through the liquid distribution net 8. The liquid distribution net 8 will perform final fine and uniform distribution of the fluid, ensuring that the fluid can cover all the fin channels of the heat exchanger in a uniform state. This multi-stage uniform distribution structure design effectively solves the problem of uneven fluid distribution in traditional heat exchangers and improves the overall heat transfer efficiency of the heat exchanger.

[0037] In a further embodiment of the present invention, two sets of staggered buffer columns 201 are provided above the central liquid distribution plate 2. The two sets of buffer columns 201 are arranged in an isosceles trapezoid. Specifically, the staggered arrangement of the two sets of buffer columns 201 forms an interlaced and dense three-dimensional barrier in the direction of liquid entry. The number of buffer columns 201 in the lower set is greater than the number of buffer columns 201 in the upper set. Before the liquid comes into contact with the central liquid distribution plate 2, the staggered buffer columns 201 actively dissipate and pre-disperse the high-speed falling concentrated liquid column. When the fluid passes through the tortuous and narrow channel formed by the two sets of staggered columns, it experiences violent acceleration, deceleration and change of direction, generating strong shear and turbulent mixing. This significantly improves the uneven velocity distribution that may exist in the fluid in the early stage, allowing the liquid falling from the central liquid distribution plate 2 to be evenly distributed. The inclined boundary of the trapezoid physically guides the fluid divided by the columns to diffuse to both sides, rather than splashing randomly, thus preparing for subsequent spreading on the central liquid distribution plate 2.

[0038] In a further embodiment of the present invention, the adjusting assembly 7 includes a movable seat 701 slidably connected to the top of the inner wall of the diversion cavity 6. An adjusting screw 702 is threaded through the movable seat 701. One end of the adjusting screw 702 is rotatably connected to the inner wall of the diversion cavity 6, and the other end passes through the side wall of the end cap 1 and is connected to a drive motor 703. A flow sensor is installed in the liquid inlet pipe 101, which controls the operation of the drive motor 703 through a controller. A traction frame 704 is fixedly connected to the bottom of the movable seat 701, and a guide rail 401 that slides with the bottom of the traction frame 704 is symmetrically fixedly connected to the top surface of the diversion vane 4. Specifically, the flow sensor in the inlet pipe 101 continuously and in real-time monitors the volumetric flow rate of the liquid entering the heat exchanger and converts the flow signal into an electrical signal, which is then transmitted to the controller. The controller compares and calculates the received real-time flow signal with the set value or internal program to determine the target lifting angle of the splitter vane 4. Subsequently, the controller generates a corresponding control command and sends it to the drive motor 703. After receiving the control command, the drive motor 703 begins to rotate precisely, driving the adjusting screw 702 to rotate. Since the adjusting screw 702 and the moving seat 701 are connected by a thread, and The movable seat 701 is restricted to sliding only, so the rotational motion of the adjusting screw 702 is converted into precise linear movement of the movable seat 701 along the inner wall of the diversion cavity 6. The linear movement of the movable seat 701 is transmitted to the diversion vane 4 through the pull frame 704 at its bottom, applying linear tension or thrust to the guide rail 401 of the diversion vane 4. Since the guide rail 401 is fixed to the diversion vane 4, this force will drive the diversion vane 4 to rotate precisely around its hinge point with the side wall of the end cap 1, thereby changing its tilt angle. Since the free end of the liquid distribution vane 3 overlaps the diversion vane 4, the diversion vane 4... The rotation of the pump will synchronously drive the liquid distribution vane 3 to lift or fall around its own hinge point. As the vane angle changes, on the one hand, the effective flow area in the diversion cavity 6 determined by the position of the moving seat 701 changes synchronously. On the other hand, the cross-sectional shape of the gradually narrowing guide channel formed between the liquid distribution vane 3 and the bottom of the diversion cavity 6 is also optimized. The whole process continues until the flow value fed back by the flow sensor and the target setting of the controller reach a dynamic balance. The drive motor 703 stops, and the system maintains the optimal vane opening, thereby ensuring that the liquid can be distributed most evenly at any flow rate.

[0039] In a further embodiment of the present invention, a horizontal bar 705 is vertically slidably installed inside the pull frame 704. Vertical slots for the horizontal bar 705 to pass through are provided on both sides of the pull frame 704. A cleaning brush 706 is installed at the bottom of the horizontal bar 705. The bristles of the cleaning brush 706 contact the drain filter screen 602. Specifically, the lateral reciprocating motion generated by the adjusting component 7 when adjusting the opening of the diverter wing plate 4 drives the cleaning brush 706 to simultaneously clean the surface of the drain filter screen 602. Under the lateral drive of the pull frame 704, the cleaning brush 706 sweeps back and forth across the entire effective width of the drain filter screen 602. This sweeping action effectively scrapes and cleans particulate impurities, fibers, scale, or biological deposits accumulated on the upper surface of the drain filter screen 602 and blocked in the mesh 301. This solves the problem of reduced flow area and decreased liquid distribution uniformity caused by impurities clogging the drain filter screen 602 during long-term operation of the plate-fin heat exchanger. Automated, continuous cleaning ensures that the filter is always in a highly permeable state, thereby guaranteeing the uniformity of the final liquid distribution throughout the entire life cycle of the equipment and maintaining heat exchange efficiency.

[0040] In a further embodiment of the present invention, both sides of the end cap 1 are equipped with inspection doors 102 that communicate with the diversion cavity 6. Guide grooves 603 are respectively provided on both sides of the inner wall of the diversion cavity 6 for inserting the end of the crossbar 705. The guide groove 603 has an inclined section and a horizontal section. The inclined section is parallel to the drain filter 602, and the horizontal section is connected to the end of the inclined section near the inspection door 102. Specifically, the inspection door 102 facilitates the inspection, maintenance, or replacement of the adjustment assembly 7 and drain filter 602 inside the diversion cavity 6 from the outside. The vertical position and horizontal movement trajectory of the crossbar 705 and the cleaning brush 706 fixed thereto are entirely determined by the groove shape of the guide groove 603. The constraint and control mechanism ensures that when the two ends of the crossbar 705 move under the constraint of the inclined section of the guide groove 603, the bristles of the cleaning brush 706 installed at the bottom of the crossbar 705 maintain stable pressure in contact with the surface of the drain filter screen 602 during this stage. When the two ends of the crossbar 705 move in the horizontal section of the guide groove 603, the change in height causes the bristles of the cleaning brush 706 fixed at the bottom of the crossbar 705 to detach from the surface of the drain filter screen 602. In this mode, the movement of the cleaning brush 706 no longer produces a brushing effect, and at the same time, the impurities brushed off before are flushed by a large flow of liquid, allowing the impurities to pass under the cleaning brush 706 and accumulate near the inspection chamber door 102.

[0041] In a further embodiment of the present invention, a plurality of receiving grooves 302 are formed on the top surface of the liquid distribution vane 3 along the liquid flow direction. A flow-blocking baffle 303 is hinged within each receiving groove 302. Cams 304 are fixedly connected to both ends of the flow-blocking baffle 303. An arc-shaped groove 103 is formed on the inner wall of the end cap 1 for the cams 304 to insert into. An abutment protrusion 104 that cooperates with the cams 304 is provided on the inner wall of the arc-shaped groove 103. Specifically, the flow-blocking baffle 303 flips open when the liquid distribution vane 3 moves as a whole, controlling the liquid film development process. The deflection of the flow-blocking baffle 303 can actively guide more liquid towards the distribution vane. The flow at both sides of the liquid vane 3 compensates for the uneven distribution of liquid in the middle and at the edges caused by centrifugal force or inertia, which strongly promotes the uniform spread of liquid across the entire width of the liquid vane 3. When the flow rate increases and the angle of the liquid vane 3 increases, the protrusion of the cam 304 on the flow baffle 303 is blocked by the abutment protrusion 104, which forces the cam 304 to drive the flow baffle 303 to change its angle, thereby increasing the sorting and distribution of the liquid flow to adapt to the larger flow rate and the more critical uniform distribution requirements. When the flow rate decreases, the flow baffle is adjusted in the opposite direction to reduce intervention.

[0042] In a further embodiment of the present invention, a dividing frame 604 is fixedly connected inside the diversion port 601. A self-closing valve plate 605 is elastically installed on one side of the dividing frame 604 located inside the diversion cavity 6. Specifically, when the total flow rate of the inlet pipe 101 is very small, the kinetic energy of the liquid impacting the central distribution plate 2 is low, and the static and dynamic pressures guided to the two diversion ports 601 are also weak. At this time, the force acting on the self-closing valve plate 605 is insufficient to overcome the preload of the elastic element. The self-closing valve plate 605 remains closed or slightly open under the action of the spring force. In this state, the passage of the diversion port 601 is effectively blocked or severely restricted. Most or even all of the incoming flow is forced to be distributed through the main distribution path of the central distribution plate 2 and the distribution vane 3, which ensures that even at extremely low flow rates... Even with this, the fluid can still be effectively concentrated on the main distribution path for initial diffusion and distribution, avoiding insufficient flow in the main path due to premature and excessive lateral diversion, which would affect the coverage of the central area of ​​the heat exchanger core. This optimizes the uniformity of liquid distribution at low flow rates. As the total flow rate of the inlet pipe 101 increases, the splashing, lateral flow, and overall pressure level within the end cap 1 generated after impacting the central distribution plate 2 rise. Consequently, the fluid pressure acting on the self-closing valve plate 605 increases. When this pressure exceeds the set threshold of the elastic element, the self-closing valve plate 605 is pushed open, the diversion chamber 6 opens, and after the multiple partitions on the dividing frame 604 divide the liquid, the liquid passes through the diversion chamber 6 evenly in the form of multiple diversions, which helps to break large-scale eddies in the liquid.

[0043] A heat exchanger includes the aforementioned energy-saving plate-fin heat exchanger liquid distribution device. By applying the liquid distribution device, the heat exchanger significantly improves its heat exchange performance and operational stability. In actual operation, regardless of flow rate changes under various operating conditions, the liquid distribution device can achieve uniform liquid distribution through its unique structural design.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An energy-saving plate-fin heat exchanger liquid distribution device, comprising a head (1) and a liquid inlet pipe (101) connected to the top of the head (1), characterized in that, Also includes: A central liquid distribution plate (2) is fixed inside the head (1) and located below the liquid inlet pipe (101). Liquid distribution wing plates (3) are respectively hinged on both sides of the central liquid distribution plate (2). A pair of flow divider vanes (4) are respectively hinged to the inside of the head (1) on both sides, and the free end of the liquid distribution vane (3) overlaps the top surface of the flow divider vane (4); A pair of diversion chambers (6) are respectively located on both sides inside the head (1). One end of the diversion chamber is provided with a diversion port (601). The bottom of the diversion chamber (6) is inclined and is embedded with a drain filter (602) located above the liquid distribution wing plate (3). An adjustment component (7) is provided inside the diversion chamber (6). The bottom of the adjustment component (7) is slidably connected to the diversion wing plate (4). When the flow rate of the inlet pipe increases, the regulating component (7) drives the flow divider (4) and the liquid distribution wing (3) to lift simultaneously, thereby increasing the fluid flow area of ​​the flow divider cavity (6).

2. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 1, characterized in that, Several horizontally distributed flexible deceleration belts (5) are installed on the flow divider (4). The flexible deceleration belts (5) are filled with shear thickening fluid. The flexible deceleration belts (5) are spaced apart along the length direction of the flow divider (4). The shear thickening fluid is a non-Newtonian fluid whose viscosity changes with the shear rate.

3. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 1, characterized in that, Multiple mesh holes (301) are provided on both the liquid distribution vane (3) and the flow divider vane (4). The size of the mesh holes (301) gradually increases along the fluid flow direction. A liquid distribution mesh (8) is horizontally embedded at the bottom of the end cap (1).

4. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 1, characterized in that, Above the central liquid distribution plate (2) are two sets of staggered buffer columns (201), and the two sets of buffer columns (201) are arranged in an isosceles trapezoid.

5. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 1, characterized in that, The adjustment assembly (7) includes a movable seat (701) that is slidably connected to the top of the inner wall of the diversion cavity (6). An adjustment screw (702) is threaded through the movable seat (701). One end of the adjustment screw (702) is rotatably connected to the inner wall of the diversion cavity (6), and the other end passes through the side wall of the end cap (1) and is connected to a drive motor (703). A traction frame (704) is fixedly connected to the bottom of the movable seat (701). A guide rail (401) that slides with the bottom of the traction frame (704) is symmetrically fixedly connected to the top surface of the diversion wing plate (4).

6. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 5, characterized in that, A horizontal bar (705) is vertically slidably installed inside the pull frame (704), and a cleaning brush (706) is installed at the bottom of the horizontal bar (705). The bristles of the cleaning brush (706) are in contact with the drain filter (602).

7. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 6, characterized in that, Both sides of the end cap (1) are equipped with maintenance doors (102) that communicate with the diversion chamber (6). The inner walls of the diversion chamber (6) are respectively provided with guide grooves (603) for inserting the end of the crossbar (705). The guide groove (603) has an inclined section and a horizontal section. The inclined section is parallel to the drain filter screen, and the horizontal section is connected to the end of the inclined section near the maintenance door (102).

8. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 1, characterized in that, The top surface of the liquid distribution vane (3) is provided with several receiving grooves (302) along the liquid flow direction. A flow-blocking baffle (303) is hinged in the receiving groove (302). A cam (304) is fixedly connected to both ends of the flow-blocking baffle (303). An arc-shaped groove (103) for inserting the cam (304) is provided on the inner wall of the end cap (1). An abutting protrusion (104) that cooperates with the cam (304) is provided on the inner wall of the arc-shaped groove (103).

9. The energy-saving plate-fin heat exchanger liquid distribution device according to claim 1, characterized in that, A dividing frame (604) is fixedly connected inside the diversion port (601), and a self-closing valve plate (605) is elastically installed on one side of the dividing frame (604) inside the diversion cavity (6).

10. A heat exchanger, characterized in that, Includes the energy-saving plate-fin heat exchanger liquid distribution device as described in any one of claims 1-9.

Images