Return-water-temperature-based variable-pressure-difference variable-flow control method for air conditioner circulating water system

Abstract

The invention discloses a variable-pressure-difference variable-flow control method of an air conditioner circulating water system based on return water temperature, and relates to the field of air conditioner circulating water systems.The method comprises the steps that cooling water enters a second circulating pipe, passes through a temperature sensor, a pressure sensor and a flow speed sensor, and transmits collected data to a controller; setting a target pressure and flow range, comparing the current pressure difference with the target pressure difference, adjusting the rotating speed of a water pump or the opening degree of a valve to enable the system pressure difference to approach to a target value, adjusting the operating parameters of the water pump according to the target flow range to ensure that the circulating water flow is within the optimal range, and starting a scale cleaning mechanism at regular intervals. And the scale cleaning mechanism moves in the circulating pipe II and is used for cleaning scale on sensing heads of the temperature sensor and the pressure sensor, so that the sensing heads on the temperature sensor and the pressure sensor can be conveniently and timely cleaned, and the situation that the scale is attached and the accuracy of a detection value is influenced is reduced.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning circulating water systems, and in particular to a variable pressure difference and variable flow control method for air-conditioning circulating water systems based on return water temperature. Background Art

[0002] The air conditioning circulating water system is a thermal control system used to maintain a constant temperature or temperature range in industrial or building facilities. The air conditioning circulating water system mainly includes a chilled water circulation system and a cooling water circulation system, as well as a host part. The cooling water circulation system is composed of a cooling pump, cooling water pipes, a cooling water tower, etc. While the chilled water circulation system performs indoor heat exchange, it will inevitably take away a large amount of indoor heat energy. This heat energy is transferred to the cooling water through the refrigerant in the host, causing the cooling water temperature to rise. The cooling pump presses the heated cooling water into the cooling water tower to exchange heat with the atmosphere, and then returns it to the host condenser after lowering the temperature.

[0003] In order to dynamically adjust the system pressure difference and flow rate and achieve a significant reduction in energy consumption, temperature, pressure and flow sensors will be installed on the return pipe. The system load status will be judged according to the return water temperature, and the target pressure difference and flow range will be set. The current pressure difference will be compared with the target pressure difference. The system pressure difference will be made close to the target value by adjusting the water pump speed or valve opening. At the same time, the water pump operating parameters will be adjusted according to the target flow range to ensure that the circulating water flow rate is within the optimal range. As the return water temperature changes, the control system will continuously repeat the above steps to achieve dynamic adjustment of the system pressure difference and flow rate.

[0004] However, in actual operation, when the temperature sensor and the pressure sensor detect the value of cooling water in the return pipe, the corresponding sensing head needs to be inserted into the return pipe. The water source used for cooling water is generally tap water, which may contain impurities. During long-term use, scale will adhere to the sensing heads of the temperature sensor and the pressure sensor, which may affect the values ​​detected by the temperature sensor and the pressure sensor. Summary of the invention

[0005] The purpose of the present application is to solve the problem that the water source used as cooling water in the above-mentioned background technology is generally tap water, which may contain impurities. During long-term use, scale will adhere to the sensing heads of the temperature sensor and the pressure sensor, which may affect the values ​​detected by the temperature sensor and the pressure sensor. The present application provides a variable pressure difference and variable flow control method based on the return water temperature of an air-conditioning circulating water system.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A variable pressure difference and variable flow control method for an air conditioning circulating water system based on return water temperature, the control method is: S1: When cooling water is used to cool the heat exchanger, water pump 1 pumps the cooling water in the heat exchanger into circulation pipe 1, and then enters the cooling tower from circulation pipe 1. After the cooling water is cooled in the cooling tower, water pump 2 pumps the cooling water into circulation pipe 2; S2: After the cooling water enters the circulation pipe 2, it passes through the temperature sensor, pressure sensor and flow rate sensor; the temperature sensor, pressure sensor and flow rate sensor collect the temperature, pressure and flow data of the cooling water, and at the same time, the cooling water enters the heat exchanger again, allowing the cooling water to take away most of the heat of the heat exchanger; S3: The collected data is simultaneously transmitted to the controller, and then based on the collected data, the controller determines the system load state according to the temperature of the cooling water and sets the target pressure and flow range; S4: Then compare the current pressure difference with the target pressure difference, adjust the water pump speed or valve opening to make the system pressure difference approach the target value, adjust the water pump operating parameters according to the target flow range, and ensure that the circulating water flow is within the optimal range; S5: Start the scale cleaning mechanism regularly, let the scale cleaning mechanism move in the circulation pipe 2, let the scale cleaning mechanism clean the scale on the temperature sensor and the pressure sensor sensing head, and at the same time, the cooling water drives the scale. When the scale enters the heat exchanger from the circulation pipe 2, the auxiliary blocking mechanism blocks the scale in the cooling water.

[0007] Furthermore, the scale cleaning mechanism includes two support rods symmetrically arranged on the circulation pipe 2, and a fixed block is fixed on each of the two support rods. The fixed block is fixedly connected to the circulation pipe 2, and two symmetrical cleaning rings are arranged between the two support rods. The two cleaning rings are located in the circulation pipe 2, and the two cleaning rings are sleeved on the sensing heads of the pressure sensor and the temperature sensor. A synchronous moving component is arranged between the two support rods, and a rotating component is arranged between the two cleaning rings and the auxiliary pipe 2.

[0008] By adopting the above technical solution, the synchronous moving component between the two support rods drives the two cleaning rings to move simultaneously, the cleaning rings move on the sensing heads on the pressure sensor and the temperature sensor, the cleaning rings scrape the surface scale on the sensing heads of the temperature sensor and the pressure sensor, and the cleaning ring drives the rotating component. Driven by the rotating component, the cleaning ring moves and rotates to clean the scale on the surface of the sensing heads of the temperature sensor and the pressure sensor. Therefore, after the temperature sensor and the pressure sensor have been used for a long time, the sensing heads on the temperature sensor and the pressure sensor can be cleaned conveniently and timely to reduce the adhered scale and affect the accuracy of the detection value.

[0009] Furthermore, the synchronous movement component includes a connecting rod arranged between two support rods, the connecting rod is located in the circulation pipe 2, one end of the connecting rod is slidably connected to a sliding rod, the sliding rod passes through the circulation pipe 2 and is fixedly connected to one of the support rods, and a driving member is provided at one end of the connecting pipe away from the sliding rod.

[0010] By adopting the above technical solution, the driving member drives the connecting rod, and the connecting rod moves under the limiting support of the sliding rod. Then the connecting rod drives the two cleaning rings, and the two cleaning rings move at the same time, so that the two cleaning rings can be easily moved simultaneously on the sensing heads of the corresponding temperature sensor and pressure sensor.

[0011] Furthermore, the driving member includes a driving threaded rod arranged on the connecting rod, and the driving threaded rod is threadedly connected to one end of the connecting rod away from the sliding rod, and a driving motor is fixed on one of the support rods, and the output end of the driving motor passes through the circulation pipe 2 and is fixedly connected to the driving threaded rod.

[0012] By adopting the above technical solution, the driving motor drives the driving threaded rod, and the driving threaded rod drives the connecting rod, so that the connecting rod can easily drive the cleaning ring to move back and forth.

[0013] Furthermore, a limiting block is fixed on one end of the sliding rod and the driving threaded rod away from the supporting rod, and the limiting block corresponds to the connecting rod.

[0014] By adopting the above technical solution, the limit block on the connecting rod and the limit block on the driving threaded rod simultaneously block the connecting rod, thereby reducing the possibility of the connecting rod falling off the driving threaded rod and the sliding rod.

[0015] Furthermore, the rotating assembly includes a support ring rotatably connected to the cleaning ring, the support ring is fixedly connected to the connecting rod, a spiral rod is slidably connected to the cleaning ring, and one end of the spiral rod is fixedly connected to the circulation pipe 2.

[0016] By adopting the above technical solution, the support ring drives the cleaning ring to move, and at the same time, under the support of the support ring, the cleaning ring moves along the spiral rod, so that the cleaning ring can further improve the cleaning effect when cleaning the sensing heads of the temperature sensor and the pressure sensor.

[0017] Furthermore, the auxiliary blocking mechanism includes a collecting box fixed on the heat exchanger, a supporting frame is provided in the collecting box, a collecting plate is fixed on the supporting frame, a plurality of evenly distributed filtering holes are provided on the collecting plate, and a pulling assembly is provided between the supporting frame and the collecting box.

[0018] By adopting the above technical solution, cooling water and scale enter the collection box, and then the collection plate on the support frame blocks the scale. The cooling water passes through the filter holes on the collection plate and enters the heat exchanger, thereby reducing the possibility of scale entering the heat exchanger.

[0019] Furthermore, slide rails are fixed on both sides of the collection box, and the slide rails are slidably connected to the support frame. One end of the support frame passes through the collection box and is fixed with a support plate. The support plate and the collection box are fixed with bolts.

[0020] By adopting the above technical solution, turn off water pump 2, remove the bolts, separate the support plate from the collection box, and then directly move the support plate to drive the support frame, so that the support frame can be pulled out with the support of two slide rails, so that the support frame can be easily pulled out and fixed in the collection box.

[0021] In summary, the present application includes at least one of the following beneficial effects: 1. The present application starts the driving motor regularly, so that the output end of the driving motor drives the driving threaded rod, and the driving threaded rod drives the connecting rod, so that the connecting rod moves under the restriction of the sliding rod, and while the connecting rod moves back and forth, the connecting rod drives the supporting ring, and the supporting ring drives the cleaning ring to move, and the cleaning ring cleans the scale on the sensing heads of the temperature sensor and the pressure sensor, and at the same time, under the support of the supporting ring, the cleaning ring moves along the spiral rod, and when the cleaning rod moves back and forth, it rotates on the supporting ring under the guidance of the spiral rod, and the cleaning ring rotates and moves to clean the scale on the sensing heads of the temperature sensor and the pressure sensor, so as to achieve the purpose of being able to clean the sensing heads of the temperature sensor and the pressure sensor conveniently and timely after the temperature sensor and the pressure sensor have been used for a long time, thereby reducing the adhesion of scale and affecting the accuracy of the detection value.

[0022] 2. In the present application, after the scale on the temperature sensor and the pressure sensor is cleaned, the scale and cooling water flow to the heat exchange machine together, the cooling water and scale enter the collection box, and then the collection plate on the support frame blocks the scale, and the cooling water passes through the filter holes on the collection plate into the heat exchanger, and then the water pump 2 is shut down regularly, and the support frame is pulled out of the collection box by using the pull-out assembly, the scale on the collection plate is cleaned, and then the support frame and the collection plate are reinserted into the collection box, thereby achieving the purpose of reducing the possibility of scale entering the heat exchanger and reducing the scale clogging the filter holes on the collection plate.

[0023] 3. In the present application, when the connecting rod moves on the sliding rod and the driving threaded rod, the limit blocks on the connecting rod and the limit blocks on the driving threaded rod simultaneously block the connecting rod, thereby achieving the purpose of reducing the possibility of the connecting rod falling off the driving threaded rod and the sliding rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a first three-dimensional structural schematic diagram of the scale cleaning mechanism in the present application; Figure 2 It is a partial structural schematic diagram of the scale cleaning mechanism in this application; Figure 3 This application Figure 1 The enlarged schematic diagram at A in the middle; Figure 4 This application Figure 2 The enlarged schematic diagram of point B in the middle; Figure 5 This application Figure 2 Enlarged schematic diagram at point C in the middle.

[0025] Description of reference numerals: 1. Cooling tower; 2. Water pump 1; 3. Heat exchanger; 4. Water pump 2; 5. Circulation pipe 1; 6. Circulation pipe 2; 7. Scale cleaning mechanism; 71. Support rod; 72. Cleaning ring; 73. Synchronous moving assembly; 731. Connecting rod; 732. Sliding rod; 733. Driving member; 7331. Driving threaded rod; 7332. Driving motor; 74. Rotating assembly; 741. Support ring; 742. Screw rod; 75. Fixed block; 76. Limit block; 8. Auxiliary blocking mechanism; 81. Collection box; 82. Support frame; 83. Collection plate; 84. Pull-out assembly; 841. Slide rail; 842. Support plate; 9. Temperature sensor; 10. Pressure sensor; 11. Flow rate sensor. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 —5 further describes this application in detail.

[0027] The embodiment of the present application discloses a variable pressure difference and variable flow control method based on return water temperature of an air conditioning circulating water system.

[0028] Reference Figure 1 , a variable pressure difference and variable flow control method based on return water temperature of an air conditioning circulating water system, the control method is: S1: When cooling the heat exchanger 3 with cooling water, the water pump 2 pumps the cooling water in the heat exchanger 3 into the circulation pipe 5, and then enters the cooling tower 1 from the circulation pipe 5. After the cooling water is cooled in the cooling tower 1, the water pump 2 4 pumps the cooling water into the circulation pipe 2 6; S2: After the cooling water enters the circulation pipe 2 6, the cooling water passes through the temperature sensor 9, the pressure sensor 10 and the flow rate sensor 11; the temperature sensor 9, the pressure sensor 10 and the flow rate sensor 11 collect the temperature, pressure and flow data of the cooling water, and at the same time, the cooling water enters the heat exchanger 3 again, so that the cooling water takes away most of the heat of the heat exchanger 3; S3: The collected data is simultaneously transmitted to the controller, and then based on the collected data, the controller determines the system load state according to the temperature of the cooling water and sets the target pressure and flow range; S4: Then compare the current pressure difference with the target pressure difference, adjust the water pump speed or valve opening to make the system pressure difference approach the target value, adjust the water pump operating parameters according to the target flow range, and ensure that the circulating water flow is within the optimal range; S5: Start the scale cleaning mechanism 7 regularly, let the scale cleaning mechanism 7 move in the circulation pipe 2 6, let the scale cleaning mechanism 7 clean the scale on the sensing heads of the temperature sensor 9 and the pressure sensor 10, and at the same time, the cooling water drives the scale. When the scale enters the heat exchanger 3 from the circulation pipe 2 6, the auxiliary blocking mechanism 8 blocks the scale in the cooling water.

[0029] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The scale cleaning mechanism 7 includes two support rods 71 ​​symmetrically arranged on the circulation pipe 6, and fixed blocks 75 are fixed on the two support rods 71. The fixed blocks 75 are fixedly connected to the circulation pipe 6. Two symmetrical cleaning rings 72 are arranged between the two support rods 71. The two cleaning rings 72 are located in the circulation pipe 6. The two cleaning rings 72 are sleeved on the sensing heads of the pressure sensor 10 and the temperature sensor 9. A synchronous moving component 73 is arranged between the two support rods 71, and a rotating component 74 is arranged between the two cleaning rings 72 and the auxiliary pipe 2.

[0030] Under the action of the water pump 24, the cooling water in the cooling tower 1 enters the circulation pipe 26, and then passes through the temperature sensor 9, the pressure sensor 10 and the flow rate sensor 11. After the temperature sensor 9 and the pressure sensor 10 have been used for a long time, the impurities in the cooling water adhere to the induction heads of the temperature sensor 9 and the pressure sensor 10 to form scale, so that the synchronous moving component 73 between the two support rods 71 ​​drives the two cleaning rings 72 to move at the same time, and the cleaning ring 72 moves on the induction heads on the pressure sensor 10 and the temperature sensor 9, and the cleaning ring 72 scrapes off the surface scale on the induction heads of the temperature sensor 9 and the pressure sensor 10. At the same time, the cleaning ring 72 drives the rotating component 74. Driven by the rotating component 74, the cleaning ring 72 moves and rotates to clean the scale on the surface of the sensing head of the temperature sensor 9 and the pressure sensor 10. After the temperature sensor 9 and the pressure sensor 10 have been used for a long time, the synchronous moving component 73 is used to drive the two cleaning rings 72 to move, so that the cleaning ring 72 moves on the sensing head of the temperature sensor 9 and the pressure sensor 10. Therefore, after the temperature sensor 9 and the pressure sensor 10 have been used for a long time, the sensing head on the temperature sensor 9 and the pressure sensor 10 can be cleaned conveniently and timely, thereby reducing the adhesion of scale and affecting the accuracy of the detection value.

[0031] Reference Figure 2 , Figure 4 and Figure 5 The synchronous moving component 73 includes a connecting rod 731 arranged between the two support rods 71, the connecting rod 731 is located in the circulation pipe 2 6, one end of the connecting rod 731 is slidably connected to a sliding rod 732, the sliding rod 732 passes through the circulation pipe 2 6, and is fixedly connected to one of the support rods 71, and a driving member 733 is arranged at one end of the connecting pipe away from the sliding rod 732.

[0032] When the two cleaning rings 72 are moved, the driving member 733 drives the connecting rod 731, and the connecting rod 731 moves under the limit support of the sliding rod 732. Then the connecting rod 731 drives the two cleaning rings 72, and the two cleaning rings 72 move at the same time. By allowing the driving member 733 to drive the connecting rod 731, and allowing the connecting rod 731 to drive the two cleaning rings 72 under the support of the sliding rod 732, the two cleaning rings 72 can be easily moved simultaneously on the corresponding sensing heads of the temperature sensor 9 and the pressure sensor 10.

[0033] Reference Figure 2 and Figure 4The driving member 733 includes a driving threaded rod 7331 arranged on the connecting rod 731, and the driving threaded rod 7331 is threadedly connected to the end of the connecting rod 731 away from the sliding rod 732. A driving motor 7332 is fixed on one of the support rods 71, and the output end of the driving motor 7332 passes through the circulation pipe 26 and is fixedly connected to the driving threaded rod 7331.

[0034] Start the driving motor 7332, let the output end of the driving motor 7332 drive the driving threaded rod 7331, let the driving threaded rod 7331 drive the connecting rod 731, and let the connecting rod 731 move under the restriction of the sliding rod 732, then let the output end of the driving motor 7332 rotate in the opposite direction, let the driving threaded rod 7331 rotate in the opposite direction, let the connecting rod 731 reset, repeat several times, let the cleaning ring move back and forth, by letting the driving motor 7332 drive the driving threaded rod 7331, and let the driving threaded rod 7331 drive the connecting rod 731, it is convenient for the connecting rod 731 to drive the cleaning ring 72 to move back and forth.

[0035] Reference Figure 2 and Figure 4 The sliding rod 732 and the driving threaded rod 7331 are both fixed with a limit block 76 at one end away from the support rod 71, and the limit block 76 corresponds to the connecting rod 731. When the connecting rod 731 moves on the sliding rod 732 and the driving threaded rod 7331, the limit block 76 on the connecting rod 731 and the limit block 76 on the driving threaded rod 7331 simultaneously block the connecting rod 731. By using the limit block 76 to block the connecting rod 731, the possibility of the connecting rod 731 falling off the driving threaded rod 7331 and the sliding rod 732 can be reduced.

[0036] Reference Figure 2 , Figure 4 and Figure 5 The rotating assembly 74 includes a support ring 741 rotatably connected to the cleaning ring 72, the support ring 741 is fixedly connected to the connecting rod 731, and a spiral rod 742 is slidably connected to the cleaning ring 72, and one end of the spiral rod 742 is fixedly connected to the circulation pipe 26.

[0037] While the connecting rod 731 moves back and forth, the connecting rod 731 drives the support ring 741, and the support ring 741 drives the cleaning ring 72 to move. The cleaning ring 72 cleans the scale on the sensing heads of the temperature sensor 9 and the pressure sensor 10. At the same time, under the support of the support ring 741, the cleaning ring 72 moves along the spiral rod 742, and the cleaning rod rotates on the support ring 741 under the guidance of the spiral rod 742 when it moves back and forth. By allowing the support ring 741 to drive the cleaning ring 72 to move back and forth, and under the guidance of the spiral rod 742, the cleaning ring 72 rotates on the support ring 741, the cleaning effect of the cleaning ring 72 can be further improved when cleaning the sensing heads of the temperature sensor 9 and the pressure sensor 10.

[0038] Reference Figure 1 and Figure 2 The auxiliary blocking mechanism 8 includes a collecting box 81 fixed on the heat exchanger 3, a supporting frame 82 is provided in the collecting box 81, a collecting plate 83 is fixed on the supporting frame 82, a plurality of evenly distributed filtering holes are provided on the collecting plate 83, and a pulling assembly 84 is provided between the supporting frame 82 and the collecting box 81.

[0039] After the scale on the temperature sensor 9 and the pressure sensor 10 is cleaned, the scale and cooling water flow to the heat exchanger together, the cooling water and scale enter the collection box 81, and then the collection plate 83 on the support frame 82 blocks the scale, and the cooling water passes through the filter holes on the collection plate 83 into the heat exchanger 3, and then the support frame 82 is pulled out of the collection box 81 by the pulling assembly 84, the scale on the collection plate 83 is cleaned, and then the support frame 82 and the collection plate 83 are reinserted into the collection box 81 to reduce the scale clogging the filter holes on the collection plate 83. By allowing the scale and cooling water to enter the collection box 81 together and using the collection plate 83 to block the scale, the possibility of scale entering the heat exchanger 3 can be reduced.

[0040] Reference Figure 1 and Figure 2, both sides of the collection box 81 are fixed with slide rails 841, the slide rails 841 are slidably connected with the support frame 82, one end of the support frame 82 passes through the collection box 81, and is fixed with a support plate 842, and the support plate 842 is fixed to the collection box 81 with bolts. When the filter holes on the collection plate 83 are blocked by scale, turn off the water pump 24, remove the bolts, separate the support plate 842 from the collection box 81, and then directly move the support plate 842, let the support plate 842 drive the support frame 82, let the support frame 82 be pulled out under the support of the two slide rails 841, and then clean the collection plate 83, by moving the support plate 842, let the support plate 842 drive the support frame 82, let the support frame 82 move under the support of the slide rail 841, so that the support frame 82 can be easily pulled out and fixed in the collection box 81.

[0041] Working principle: When cooling water is used to cool the heat exchanger 3, water pump 2 pumps the cooling water in the heat exchanger 3 into the circulation pipe 5, and then enters the cooling tower 1 from the circulation pipe 5. After the cooling water is cooled in the cooling tower 1, water pump 2 4 pumps the cooling water into the circulation pipe 6. The cooling water passes through the temperature sensor 9, the pressure sensor 10 and the flow rate sensor 11; the temperature sensor 9, the pressure sensor 10 and the flow rate sensor 11 collect the temperature, pressure and flow data of the cooling water. At the same time, the cooling water enters the heat exchanger 3 again, allowing the cooling water to take away most of the heat of the heat exchanger 3. Then, based on the collected data, the controller judges the system load state according to the temperature of the cooling water, sets the target pressure and flow range, and then compares the current pressure difference with the target pressure difference. By adjusting the water pump speed or the valve opening, the system pressure difference is close to the target value. The water pump operating parameters are adjusted according to the target flow range to ensure that the circulating water flow is within the optimal range.

[0042] Start the driving motor 7332 regularly, let the output end of the driving motor 7332 drive the driving threaded rod 7331, let the driving threaded rod 7331 drive the connecting rod 731, let the connecting rod 731 move under the restriction of the sliding rod 732, while the connecting rod 731 moves back and forth, the connecting rod 731 drives the supporting ring 741, the supporting ring 741 drives the cleaning ring 72 to move, the cleaning ring 72 cleans the scale on the sensing head of the temperature sensor 9 and the pressure sensor 10, and at the same time, under the support of the supporting ring 741, let the cleaning ring 72 move along the spiral rod 742, let the cleaning rod move back and forth under the guidance of the spiral rod 742 on the supporting ring 741. 41, so that the cleaning ring 72 rotates and moves to clean the scale on the sensing heads of the temperature sensor 9 and the pressure sensor 10, and the scale and cooling water flow to the heat exchange machine together, and the cooling water and the scale enter the collection box 81, and then the collection plate 83 on the support frame 82 blocks the scale, and the cooling water passes through the filter holes on the collection plate 83 into the heat exchanger 3, and then the water pump 24 is turned off regularly, and then the pull-out assembly 84 is used to pull the support frame 82 out of the collection box 81, clean the scale on the collection plate 83, and then reinsert the support frame 82 and the collection plate 83 into the collection box 81 to reduce the scale from clogging the filter holes on the collection plate 83.

Claims

1. A variable pressure difference and variable flow control method for an air conditioning circulating water system based on return water temperature, characterized in that: The control method is: S1: When cooling the heat exchanger (3) by using cooling water, water pump 1 (2) pumps the cooling water in the heat exchanger (3) into circulation pipe 1 (5), and then the cooling water enters the cooling tower (1) from the circulation pipe 1 (5). After the cooling water is cooled in the cooling tower (1), water pump 2 (4) pumps the cooling water into circulation pipe 2 (6); S2: After the cooling water enters the circulation pipe 2 (6), the cooling water passes through the temperature sensor (9), the pressure sensor (10) and the flow rate sensor (11); the temperature sensor (9), the pressure sensor (10) and the flow rate sensor (11) collect temperature, pressure and flow rate data of the cooling water, and at the same time, the cooling water enters the heat exchanger (3) again, allowing the cooling water to take away most of the heat of the heat exchanger (3); S3: The collected data is simultaneously transmitted to the controller, and then based on the collected data, the controller determines the system load state according to the temperature of the cooling water and sets the target pressure and flow range; S4: Then compare the current pressure difference with the target pressure difference, adjust the water pump speed or valve opening to make the system pressure difference approach the target value, adjust the water pump operating parameters according to the target flow range, and ensure that the circulating water flow is within the optimal range; S5: Regularly start the scale cleaning mechanism (7) and allow the scale cleaning mechanism (7) to move in the circulation pipe (6) so that the scale cleaning mechanism (7) cleans the scale on the sensing heads of the temperature sensor (9) and the pressure sensor (10). At the same time, the cooling water drives the scale. When the scale enters the heat exchanger (3) from the circulation pipe (6), the auxiliary blocking mechanism (8) blocks the scale in the cooling water.

2. The variable pressure difference and variable flow control method of an air conditioning circulating water system based on return water temperature according to claim 1 is characterized in that: The scale cleaning mechanism (7) comprises two support rods (71) symmetrically arranged on the circulation pipe (6), a fixing block (75) being fixed on each of the two support rods (71), the fixing block (75) being fixedly connected to the circulation pipe (6), two symmetrical cleaning rings (72) being arranged between the two support rods (71), the two cleaning rings (72) being located inside the circulation pipe (6), the two cleaning rings (72) being sleeved on the sensing heads of the pressure sensor (10) and the temperature sensor (9), a synchronous moving assembly (73) being arranged between the two support rods (71), and a rotating assembly (74) being arranged between the two cleaning rings (72) and the auxiliary pipe (6).

3. The variable pressure difference and variable flow control method based on return water temperature of an air conditioning circulating water system according to claim 2 is characterized in that: The synchronous moving assembly (73) comprises a connecting rod (731) arranged between two supporting rods (71), the connecting rod (731) being located in the second circulation pipe (6), one end of the connecting rod (731) being slidably connected to a sliding rod (732), the sliding rod (732) passing through the second circulation pipe (6) and being fixedly connected to one of the supporting rods (71), and a driving member (733) being arranged at one end of the connecting pipe away from the sliding rod (732).

4. The variable pressure difference and variable flow control method of an air conditioning circulating water system based on return water temperature according to claim 3 is characterized in that: The driving member (733) comprises a driving threaded rod (7331) arranged on the connecting rod (731), the driving threaded rod (7331) being threadedly connected to an end of the connecting rod (731) away from the sliding rod (732), a driving motor (7332) being fixed on one of the supporting rods (71), the output end of the driving motor (7332) passing through the circulation pipe 2 (6) and being fixedly connected to the driving threaded rod (7331).

5. The variable pressure difference and variable flow control method based on return water temperature of an air conditioning circulating water system according to claim 4 is characterized in that: A limiting block (76) is fixed on one end of the sliding rod (732) and the driving threaded rod (7331) away from the supporting rod (71), and the limiting block (76) corresponds to the connecting rod (731).

6. The variable pressure difference and variable flow control method based on return water temperature of an air conditioning circulating water system according to claim 3 is characterized in that: The rotating assembly (74) comprises a support ring (741) rotatably connected to the cleaning ring (72), the support ring (741) being fixedly connected to the connecting rod (731), a spiral rod (742) being slidably connected to the cleaning ring (72), and one end of the spiral rod (742) being fixedly connected to the second circulation pipe (6).

7. The variable pressure difference and variable flow control method based on return water temperature of an air conditioning circulating water system according to claim 2, characterized in that: The auxiliary blocking mechanism (8) comprises a collection box (81) fixed on the heat exchanger (3), a support frame (82) being provided in the collection box (81), a collection plate (83) being fixed on the support frame (82), a plurality of evenly distributed filter holes being provided on the collection plate (83), and a drawer assembly (84) being provided between the support frame (82) and the collection box (81).

8. The variable pressure difference and variable flow control method based on return water temperature of an air conditioning circulating water system according to claim 7, characterized in that: Slide rails (841) are fixed on both sides of the collection box (81); the slide rails (841) are slidably connected to the support frame (82); one end of the support frame (82) passes through the collection box (81) and is fixed with a support plate (842); the support plate (842) and the collection box (81) are fixed by bolts.

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