Energy-saving cascade heat exchanger with scale reduction

Abstract

The present application relates to heat exchanger technical field, disclose a kind of energy-saving type heat exchanger of scale reduction, comprising: two series-connected coil heat exchanger, and the port of coil heat exchanger is provided with adjustable scale reduction module;Adjustable scale reduction module includes: the liquid inlet pipe head cover connected at the liquid inlet port of coil heat exchanger, and multiple flow guide fans are distributed along the axial series connection of coil heat exchanger pipeline;Liquid inlet pipe head cover is integrated with fan adjusting module, and adjacent flow guide fan is connected by adjusting interval silk with adjustable axial spacing, and the vane of each flow guide fan is connected by rotating shaft, and the inclination angle of all vanes is realized synchronous regulation by adjusting angle silk;The present application is by setting sensor in liquid inlet port and liquid outlet port, and real-time acquisition medium flow parameter, control system can accurately analyze scale formation state, once detecting scale formation trend, automatically control fan adjusting module action, without shutdown can be carried out scale reduction operation, ensure the continuity of production.

Description

Technical Field

[0001] This invention relates to the field of heat exchangers, and more specifically, to an energy-saving series heat exchanger with descaling capability. Background Technology

[0002] Heat exchangers are common equipment in many industrial sectors, including chemical, petroleum, power, food, and others, and play an important role in production. Among them, coil heat exchangers are widely used due to their compact structure and high heat transfer efficiency. However, during long-term operation of existing coil heat exchangers, scale, dirt, and other deposits easily form on the inner wall of the heat exchange tubes.

[0003] In existing technologies, periodic chemical cleaning or mechanical descaling is commonly used to address the scaling problem in heat exchangers. However, chemical cleaning requires shutdown, disrupting production continuity, and the chemicals may corrode the equipment; mechanical descaling is often complex and difficult to implement online. Furthermore, some existing technologies attempt to flush the tube walls by changing the fluid flow rate, but this is difficult to dynamically adjust based on the real-time scaling status, resulting in poor descaling effectiveness or excessive energy consumption. Therefore, we propose an energy-saving series heat exchanger with scale-reducing capabilities. Summary of the Invention

[0004] This invention provides an energy-saving series heat exchanger that can reduce scale, solving the technical problem in related technologies that rely on changing the fluid flow rate to flush the tube wall, which is difficult to dynamically adjust according to the real-time scaling status, resulting in poor descaling effect or excessive energy consumption.

[0005] The present invention provides an energy-saving series heat exchanger with scale reduction capability, comprising: two coil heat exchangers arranged in series, wherein the ports of the coil heat exchangers are provided with adjustable scale reduction modules; The adjustable scale reduction module includes: an inlet pipe head cover connected to the liquid inlet port of the coil heat exchanger, and multiple guide fans distributed in series along the axial direction of the coil heat exchanger pipes. The inlet pipe head cover is integrated with a fan adjustment module. Adjacent guide fans are connected by an adjustable axial spacing through an adjustment screw. The fan blades of each guide fan are connected by a rotating shaft, and the tilt angle of all fan blades is adjusted synchronously through an angle adjustment screw. Sensors are embedded in both the inlet and outlet ports of the coil heat exchanger. The sensors are used to collect medium flow parameters in real time and transmit the data to the control system. The control system analyzes the scaling state based on the medium flow parameters. When scaling trend is detected, the control fan adjustment module performs the following operations: adjusts the axial spacing of adjacent guide fans by adjusting the spacing wire to change the flow field distribution, and adjusts the tilt angle of the fan blades by adjusting the angle wire to change the medium turbulence intensity. Both the adjusting wire and the adjusting angle wire are connected to the adjusting fan module, and the drive unit controls the extension and retraction of the adjusting wire and the adjusting angle wire.

[0006] Furthermore, a partition plate is installed in the gap between the two coil heat exchangers, and an outlet pipe head cover is installed at the liquid outlet port of the coil heat exchanger. Both the outlet pipe head cover and the inlet pipe head cover are fixed to the partition plate.

[0007] Furthermore, the fan adjustment module includes a fan adjustment head fixed on the liquid inlet pipe head cover and an instrument box fixed on the partition plate. The instrument box contains an electrical control box, an angle adjustment push rod, and a space adjustment push rod. The electrical control box is connected to the sensors at the liquid inlet and liquid outlet ports of the coil heat exchanger via wires.

[0008] Furthermore, both the angle adjustment push rod and the spacing adjustment push rod have a pull screw fixed on their telescopic arms. The angle of the guide fan blades is adjusted by pulling the corresponding pull screw when the telescopic arm of the angle adjustment push rod is extended or retracted, and the spacing of the guide fan is adjusted by pulling the corresponding pull screw when the telescopic arm of the spacing adjustment push rod is extended or retracted.

[0009] Furthermore, the interior of the adjusting fan head is divided into two opposing spaces, which are adjusting chambers. Each adjusting chamber has an adjusting slider that is slidably installed. The upper and lower walls of the adjusting slider are fixedly equipped with sealing films, and the outer ring wall of the sealing film is fixedly and sealed to the inner wall of the adjusting chamber. The ends of the two pull screws are respectively connected to the corresponding adjusting sliders, which are used to pull the adjusting sliders to slide up and down in the adjusting chamber.

[0010] Furthermore, a push spring is provided between each of the two adjacent guide fans to push the two adjacent guide fans to maintain the distance. The top of the adjustment screw is connected to the bottom of one of the two adjustment sliders, and the distance between the two adjacent guide fans is adjusted by the displacement of the adjustment slider.

[0011] Furthermore, the guide fan blade adjustment area is provided with a sliding groove, which is arc-shaped. An external rubber tube is sleeved on the outside of the angle adjustment wire between two adjacent guide fans, which is used to push the guide fan when the angle adjustment wire is tightened. The top of the angle adjustment wire is connected to another adjustment slider.

[0012] Furthermore, a powerful pull head is fixedly installed above the liquid outlet tube head cover. The interior of the powerful pull head is also designed with two independent spaces, and a wire-pulling slider is slidably installed in each space.

[0013] Furthermore, a strong spring is fixedly installed on the lower wall of each of the two wire drawing sliders, and the strong spring always applies an upward pushing force to its corresponding wire drawing slider.

[0014] Furthermore, one of the two wire-drawing sliders is connected to the end of the adjusting wire, and the other is connected to the end of the adjusting wire.

[0015] The beneficial effects of this invention are as follows: This invention uses sensors at the inlet and outlet ports to collect media flow parameters in real time. The control system can accurately analyze the scaling state. Once a scaling trend is detected, the fan control module is automatically activated, and scaling reduction can be performed without stopping the machine, ensuring the continuity of production. Adjusting the axial spacing between adjacent guide fans with the adjusting screws alters the flow field distribution within the pipe; simultaneously, adjusting the tilt angle of the fan blades with the adjusting screws changes the turbulence intensity and rotational speed of the medium. This dual adjustment mechanism generates the optimal fluid scouring force field for different levels of scaling, effectively breaking down fouling deposits and achieving efficient scale reduction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the liquid inlet pipe head cover structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the instrument box of the present invention; Figure 4 This is a schematic diagram of the internal structure of the liquid outlet tube head cover of the present invention; Figure 5 This is a schematic diagram of the internal structure of the adjusting fan head of the present invention; Figure 6 This is a schematic diagram of the internal structure of a section of the coil heat exchanger of the present invention; Figure 7 This is a schematic diagram of the flow guide fan structure of the present invention; Figure 8 This is a schematic diagram of the left-side structure of the airflow guide fan of the present invention.

[0017] In the diagram: 11. Coil heat exchanger; 12. Partition plate; 13. Liquid outlet pipe head cover; 14. High-strength pull head; 15. Wire pull slider; 16. High-strength spring; 2. Adjustable scale reduction module; 21. Liquid inlet pipe head cover; 22. Flow guide fan; 221. Adjustment screw; 222. Angle adjustment screw; 223. Push fan spring; 224. Outer rubber hose; 225. Slide groove; 23. Adjusting fan head; 231. Adjustment chamber; 232. Adjustment slider; 233. Sealing film; 234. Pull block screw; 31. Instrument box; 32. Sensor; 33. Electrical control box; 34. Angle adjustment push rod; 35. Adjustment push rod. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1-8 As shown, an energy-saving series heat exchanger with scale reduction capability includes: two coil heat exchangers 11 connected in series, and an adjustable scale reduction module 2 is provided at the port of the coil heat exchanger 11. The adjustable scale reduction module 2 includes: an inlet pipe head cover 21 connected to the liquid inlet port of the coil heat exchanger 11, and multiple guide fans 22 distributed in series along the pipe axis of the coil heat exchanger 11. The inlet pipe head cover 21 is integrated with a fan adjustment module. Adjacent guide fans 22 are connected by an adjustable axial spacing through an adjustment wire 221. The fan blades of each guide fan 22 are connected by a rotating shaft, and the tilt angle of all fan blades is synchronously adjusted through the angle adjustment wire 222. Sensors 32 are embedded in both the inlet and outlet ports of the coil heat exchanger 11. The sensors 32 are used to collect medium flow parameters in real time and transmit the data to the control system. The control system analyzes the scaling state based on the medium flow parameters. When a scaling trend is detected, the control fan adjustment module performs the following operations: adjusts the axial spacing of adjacent guide fans 22 by adjusting the spacing wire 221 to change the flow field distribution, and adjusts the tilt angle of the fan blades by adjusting the angle wire 222 to change the medium turbulence intensity. Both the adjusting wire 221 and the adjusting wire 222 are connected to the adjusting fan module, and the drive unit controls the extension and retraction of the adjusting wire 221 and the adjusting wire 222.

[0020] A partition plate 12 is provided in the gap between the two coil heat exchangers 11, and an outlet pipe head cover 13 is provided at the outlet port of the coil heat exchanger 11. Both the outlet pipe head cover 13 and the inlet pipe head cover 21 are fixed on the partition plate 12.

[0021] The fan adjustment module includes a fan adjustment head 23 fixed on the inlet pipe head cover 21 and an instrument box 31 fixed on the partition plate 12. The instrument box 31 has an electrical control box 33, an angle adjustment push rod 34 and an interval adjustment push rod 35 fixedly installed inside. The electrical control box 33 is connected to the sensors 32 at the inlet and outlet ports of the coil heat exchanger 11 via wires.

[0022] Both the angle adjustment push rod 34 and the spacing adjustment push rod 35 have a pull block wire 234 fixed on their telescopic arms. The angle of the guide fan 22 is adjusted by pulling the corresponding pull block wire 234 through the telescopic arm of the angle adjustment push rod 34, and the spacing of the guide fan 22 is adjusted by pulling the corresponding pull block wire 234 through the telescopic arm of the spacing adjustment push rod 35.

[0023] The interior of the adjusting fan head 23 is divided into two opposing spaces, namely adjusting chambers 231. Each adjusting chamber 231 has an adjusting slider 232 that is slidably installed. The upper and lower walls of the adjusting slider 232 are fixedly provided with sealing films 233, and the outer ring wall of the sealing film 233 is fixedly and sealed to the inner wall of the adjusting chamber 231. The ends of the two pull wires 234 are respectively connected to the corresponding adjusting sliders 232, which are used to pull the adjusting sliders 232 to slide up and down in the adjusting chamber 231.

[0024] Each of the two adjacent guide fans 22 is provided with a push spring 223, which is used to push the two adjacent guide fans 22 to maintain the distance. The top end of the adjustment wire 221 is connected to the bottom of one of the two adjustment sliders 232, and the distance between the two adjacent guide fans 22 is adjusted by the displacement of the adjustment slider 232.

[0025] The guide fan 22 has a sliding groove 225 at the blade adjustment point. The sliding groove 225 is arc-shaped. An outer rubber tube 224 is sleeved on the outside of the angle adjustment wire 222 between two adjacent guide fans 22. It is used to push the guide fan 22 when the angle adjustment wire 222 is tightened. The top of the angle adjustment wire 222 is connected to another adjustment slider 232.

[0026] A powerful pull head 14 is fixedly installed above the liquid outlet tube head cover 13. The interior of the powerful pull head 14 is also designed with two independent spaces, and a wire pulling slider 15 is slidably installed in each space.

[0027] A strong spring 16 is fixedly installed on the lower wall of each of the two wire drawing sliders 15. The strong spring 16 always applies an upward pushing force to its corresponding wire drawing slider 15.

[0028] One of the two wire-drawing sliders 15 is connected to the end of the adjusting wire 221, and the other is connected to the end of the adjusting wire 222.

[0029] Its core lies in achieving online optimization of the internal flow field of the heat exchanger through closed-loop control of real-time monitoring, active analysis and dynamic adjustment, thereby suppressing fouling, reducing flow resistance and improving heat exchange efficiency.

[0030] Overall workflow: The heat exchange medium enters the first coil heat exchanger 11 through the inlet pipe shroud 21, and after heat exchange, flows out from the outlet port, then enters the second coil heat exchanger 11 for secondary heat exchange, and is finally discharged. During this process, the control system drives the adjustable scale reduction module 2 to adjust the spacing and angle of the guide fan 22 according to the data from the sensor 32, thereby changing the flow state of the medium.

[0031] Principle of scaling condition detection and judgment: Sensors 32, embedded in the inlet and outlet ports of the coil heat exchanger 11, collect media flow parameters in real time, including but not limited to: inlet pressure P1, outlet pressure P2, inlet temperature T1, outlet temperature T2, and volumetric flow rate Q.

[0032] The control system calculates the following key indicators based on these parameters: Actual pressure drop ΔP_actual: ΔP_actual = P1 - P2; The theoretical clean pressure drop ΔP_clean: Calculated using the Darcy-Weisbach formula based on the medium properties (density ρ, dynamic viscosity μ), pipe diameter d, pipe length L, and initial roughness: ΔP_clean = f_clean·(L / d)·(ρ·v² / 2); where v = Q / (π·d² / 4) is the flow velocity, and f_clean is the friction factor under clean conditions.

[0033] Fouling thermal resistance R_f: calculated based on the change in the overall heat transfer coefficient.

[0034] The overall heat transfer coefficient U_clean in the clean state is known, and the actual overall heat transfer coefficient U_actual in operation is obtained by the following formula: 1 / U_actual=1 / U_clean+R_f; By measuring the heat exchange Φ=m·c_p·(T2-T1) and the logarithmic mean temperature difference LMTD, U_actual is calculated in reverse, and then R_f is obtained.

[0035] Scaling trend determination logic: When ΔP_actual>k1·ΔP_clean (e.g., k1=1.2, i.e., pressure drop increases by 20%) or R_f>R_f,max (e.g., 0.0005m²·K / W), the system determines that there is a significant scaling trend and starts the scaling reduction adjustment program.

[0036] Dynamic scale reduction regulation principle: The control system sends instructions to the fan adjustment module (fan head 23, instrument box 31, and electrical control box 33), and pulls the corresponding pull block wire 234 by extending and retracting the angle adjustment push rod 34 and the space adjustment push rod 35, thereby driving the position adjustment slider 232 to slide in the position adjustment chamber 231.

[0037] Axial spacing adjustment (controlled by adjusting screw 221): The adjusting push rod 35 pulls an adjusting slider 232 via the pull wire 234. This slider is connected to the adjusting wire 221. The extension and retraction of the adjusting wire 221 changes the spacing between adjacent guide fans 22. At the same time, the push fan spring 223 provides a reverse thrust to ensure that the spacing is stable and adjustable.

[0038] Flow field effects: Reducing the spacing (e.g., from 50mm to 30mm) will increase the local flow velocity and turbulence intensity, enhancing the scouring effect on the pipe wall; increasing the spacing will reduce resistance.

[0039] The relationship between turbulence intensity I and spacing S can be approximated as: I∝1 / S (within a reasonable range).

[0040] Fan blade angle adjustment (controlled by adjustment screw 222): The angle adjustment push rod 34 pulls another adjustment slider 232 via another pull block wire 234, which is connected to the angle adjustment wire 222. The extension and retraction of the angle adjustment wire 222 causes the fan blades of the guide fan 22 to rotate around the rotation axis, while the slide groove 225 and the outer rubber tube 224 ensure smooth movement.

[0041] Flow field effects: Increasing the blade tilt angle (e.g., from 30° to 50°) will significantly increase the swirling intensity and turbulent dissipation rate, strengthen the disturbance to the boundary layer, and thus disrupt the conditions for scale adhesion.

[0042] The relationship between the turbulent dissipation rate ε and the blade angle θ can be approximated as: ε∝tan²θ.

[0043] Energy-saving principle: Traditional passive descaling (such as increasing flow rate) leads to a sharp increase in pump power consumption (W∝v³). This invention uses precise, localized turbulence enhancement to add necessary disturbances only to the contaminated pipe section, rather than increasing the overall flow rate.

[0044] In cases of slight scaling, a small increase in turbulence intensity I can effectively suppress scale growth, while the increase in pressure drop ΔP is much smaller than that of the overall flow rate increase scheme.

[0045] When significant scaling occurs, efficient scaling removal can be achieved through a combination of adjustments (reducing the spacing + increasing the angle), and the system can be restored to a low-resistance state after scaling removal.

[0046] The overall pump consumption of the system, W_pump=Q·ΔP_actual / η_pump, can be increased controllably after adjustment, and the comprehensive energy saving rate can reach 15% to 30% (based on simulation and experimental data).

[0047] Auxiliary tension control at the outlet: The high-strength pull head 14 above the liquid outlet pipe head cover 13 is equipped with a wire-pulling slider 15 and a high-strength spring 16. These two wire-pulling sliders 15 are respectively connected to the ends of the adjusting wire 221 and the adjusting wire 222. The high-strength spring 16 always provides an upward preload to ensure that the two wires remain taut during long-distance arrangement in the heat exchanger, avoiding adjustment lag or failure caused by slack and ensuring adjustment accuracy.

[0048] Process analysis of each module: A: Data acquisition module Composition: Sensor 32 (pressure, temperature, flow).

[0049] Function: Real-time acquisition of medium pressure, temperature and flow signals at the inlet and outlet of coil heat exchanger 11.

[0050] Output: Electrical signals (P1, P2, T1, T2, Q).

[0051] B: Data Analysis and Scale Identification Module Composition: Electrical control box 33 and built-in microprocessor and algorithm model.

[0052] Function: Receives signals from sensor 32, calculates the actual pressure drop ΔP_actual, the theoretical cleaning pressure drop ΔP_clean, and the fouling thermal resistance R_f, and compares them with preset thresholds to determine the degree and trend of fouling.

[0053] Output: Control commands (pitch adjustment amount ΔS, angle adjustment amount Δθ).

[0054] C: Execution driver module Composition: Instrument box 31, electrical control box 33, angle adjustment push rod 34, space adjustment push rod 35, pull block wire 234.

[0055] Function: Receives control commands, drives the angle adjustment push rod 34 and the space adjustment push rod 35 to produce precise telescopic displacement, and transmits the displacement to the fan head 23 through the pull block wire 234.

[0056] Output: Mechanical displacement (X_angle, X_space).

[0057] D: Mechanical conversion and adjustment module Composition: Fan head 23, adjustment chamber 231, adjustment slider 232, sealing film 233, adjustment thread 221, adjustment angle thread 222.

[0058] Function: Pulling screw 234 pulls adjusting slider 232 to slide within adjusting chamber 231. Adjusting slider 232 drives adjusting screw 221 and adjusting screw 222 to extend and retract respectively. Adjusting screw 221 directly changes the axial spacing of guide fan 22; adjusting screw 222 drives fan blade rotation through slide groove 225 and outer rubber tube 224.

[0059] Output: Change in spacing ΔS of guide fan 22, change in fan blade angle Δθ.

[0060] E: Flow field control and scale reduction module Composition: guide fan 22, push fan spring 223, slide groove 225, outer rubber tube 224.

[0061] Function: The altered blade angle and spacing act on the flowing medium, generating specific turbulence, swirling flow, or jets, enhancing the shear force on the pipe wall, and suppressing and removing scale. The pusher spring 223 ensures stable reset of the spacing adjustment.

[0062] Output: Optimized flow field (increased turbulence intensity I, thinner boundary layer).

[0063] F: Feedback and Maintenance Module Composition: 14 high-strength pull head, 15 wire drawing slider, 16 high-strength spring.

[0064] Function: Apply constant tension to the ends of the adjusting wires 221 and 222 to eliminate mechanical backlash and ensure adjustment accuracy and system stability.

[0065] Output: Stable wire tension.

[0066] Active intelligent scale reduction extends equipment life: The scale status is monitored in real time by sensor 32 and control system, and the spacing and angle of the guide fan 22 are actively adjusted to inhibit and remove scale online, avoiding periodic shutdown for cleaning and significantly extending the service life of coil heat exchanger 11.

[0067] Significant energy-saving effect: Unlike traditional high-energy-consuming solutions that increase overall flow rate, this method employs localized and precise turbulence enhancement (adjusting the guide fan 22). While achieving the same descaling effect, the increase in pump power consumption is far lower than that of traditional methods, with an overall energy saving rate of 15% to 30%, achieving a balance between "descaling reduction" and "energy saving".

[0068] Wide range and high precision adjustable capability: The spacing and blade angle of the guide fan 22 are independently controlled by the adjusting wire 221 and the adjusting wire 222 respectively. Combined with the mechanical design of the push fan spring 223 and the slide groove 225, a wide range and high precision adjustment of the flow field parameters (turbulence intensity and swirl number) can be achieved, which can adapt to the needs of different media, different types of dirt and different working conditions.

[0069] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. An energy-saving series heat exchanger with scale reduction capability, characterized in that, include: Two coil heat exchangers (11) are connected in series, and the ports of the coil heat exchangers (11) are equipped with adjustable descaling modules (2). The adjustable scale reduction module (2) includes: an inlet pipe head cover (21) connected to the liquid inlet port of the coil heat exchanger (11), and multiple guide fans (22) distributed in series along the pipe axis of the coil heat exchanger (11). The inlet pipe head cover (21) is integrated with a fan adjustment module. Adjacent guide fans (22) are connected by an adjustable axial spacing through an adjustment wire (221). The fan blades of each guide fan (22) are connected by a rotating shaft, and the tilt angle of all fan blades is synchronously adjusted through the angle adjustment wire (222). Sensors (32) are embedded in both the inlet and outlet ports of the coil heat exchanger (11). The sensors (32) are used to collect medium flow parameters in real time and transmit the data to the control system. The control system analyzes the scaling state based on the medium flow parameters. When a scaling trend is detected, the control fan adjustment module performs the following operations: adjusts the axial spacing of adjacent guide fans (22) by adjusting the spacing wire (221) to change the flow field distribution, and adjusts the tilt angle of the fan blades by adjusting the angle wire (222) to change the medium turbulence intensity. The adjusting wire (221) and the adjusting wire (222) are both connected to the adjusting fan module, and the driving unit controls the extension and retraction of the adjusting wire (221) and the extension and retraction of the adjusting wire (222).

2. The energy-saving series heat exchanger with scale reduction capability according to claim 1, characterized in that, A partition plate (12) is provided in the gap between the two coil heat exchangers (11), and a liquid outlet pipe head cover (13) is provided at the liquid outlet port of the coil heat exchanger (11). Both the liquid outlet pipe head cover (13) and the liquid inlet pipe head cover (21) are fixed on the partition plate (12).

3. The energy-saving series heat exchanger with scale reduction capability according to claim 2, characterized in that, The fan adjustment module includes a fan adjustment head (23) fixed on the liquid inlet pipe head cover (21) and an instrument box (31) fixed on the partition plate (12). The instrument box (31) is equipped with an electrical control box (33), an angle adjustment push rod (34), and an interval adjustment push rod (35). The electrical control box (33) is connected to the sensors (32) at the liquid inlet and liquid outlet ports of the coil heat exchanger (11) via wires.

4. The energy-saving series heat exchanger with scale reduction capability according to claim 3, characterized in that, Both the angle adjustment push rod (34) and the spacing adjustment push rod (35) have a pull wire (234) fixed on their telescopic arms. The angle of the guide fan (22) is adjusted by pulling the corresponding pull wire (234) through the telescopic arm of the angle adjustment push rod (34), and the spacing of the guide fan (22) is adjusted by pulling the corresponding pull wire (234) through the telescopic arm of the spacing adjustment push rod (35).

5. The energy-saving series heat exchanger with scale reduction capability according to claim 4, characterized in that, The interior of the adjusting fan head (23) is divided into two opposing spaces, namely adjusting chambers (231). Each adjusting chamber (231) is slidably provided with an adjusting slider (232). The upper and lower walls of the adjusting slider (232) are fixedly provided with sealing films (233), and the outer ring wall of the sealing film (233) is fixedly and sealed to the inner wall of the adjusting chamber (231). The ends of the two pull wires (234) are respectively connected to the corresponding adjusting sliders (232) for pulling the adjusting sliders (232) to slide up and down in the adjusting chamber (231).

6. The energy-saving series heat exchanger with scale reduction capability according to claim 5, characterized in that, A push spring (223) is provided between each of the two adjacent guide fans (22) to push the two adjacent guide fans (22) to maintain the distance. The top end of the adjustment wire (221) is connected to the bottom of one of the two adjustment sliders (232). The distance between the two adjacent guide fans (22) is adjusted by the displacement of the adjustment slider (232).

7. The energy-saving series heat exchanger with scale reduction capability according to claim 6, characterized in that, The guide fan (22) has a sliding groove (225) at the blade adjustment point. The sliding groove (225) is arc-shaped. An outer rubber tube (224) is sleeved on the outside of the angle adjustment wire (222) between two adjacent guide fans (22) for pushing the guide fan (22) when the angle adjustment wire (222) is tightened. The top of the angle adjustment wire (222) is connected to another adjustment slider (232).

8. The energy-saving series heat exchanger with scale reduction capability according to claim 7, characterized in that, A powerful pull head (14) is fixedly installed above the liquid outlet tube head cover (13). The interior of the powerful pull head (14) is also designed with two independent spaces, and a wire drawing slider (15) is slidably installed in each space.

9. The energy-saving series heat exchanger with scale reduction capability according to claim 8, characterized in that, A strong spring (16) is fixedly installed on the lower wall of each of the two wire drawing sliders (15). The strong spring (16) always applies an upward pushing force to its corresponding wire drawing slider (15).

10. The energy-saving series heat exchanger with scale reduction capability according to claim 9, characterized in that, One of the two wire-drawing sliders (15) is connected to the end of the adjusting wire (221), and the other is connected to the end of the adjusting wire (222).

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