A circulating water physical descaling and filtering integrated device for district cooling and heating system

Abstract

This invention relates to the field of circulating water treatment equipment technology, specifically to an integrated physical descaling and filtration device for circulating water in district cooling and heating systems. The device includes a treatment tank, an inlet pipe and an outlet connected to the treatment tank, and a filter screen disposed within the treatment tank. The inlet pipe is arranged tangentially to the treatment tank to allow circulating water to enter tangentially and form a vortex. The outlet is located at the top of the treatment tank to discharge filtered circulating water. The filter screen is disposed below the outlet to filter the circulating water. This invention uses a tangential inlet pipe to create a vortex within the treatment tank, utilizing centrifugal force to separate impurities. The filter screen employs an elastic suspension structure, combined with a hydraulically driven impact mechanism and a rotating scraper, to achieve simultaneous cleaning of the inner and outer walls, effectively preventing scale bridging and clogging. Its modular design facilitates maintenance and offers the advantages of high efficiency, energy saving, and no need for external power.

Description

Technical Field

[0001] This invention relates to the field of circulating water treatment equipment technology, specifically to an integrated device for physical descaling and filtration of circulating water in district cooling and heating systems. Background Technology

[0002] District cooling and heating systems, as an important component of modern urban energy infrastructure, are widely used in large commercial buildings, industrial parks and residential areas to provide centralized cooling and heating energy supply. These systems typically rely on circulating water as the heat transfer medium and achieve heat transfer and regulation through cooling towers, heat exchangers and pipe networks.

[0003] However, in actual operation, circulating water often faces water quality deterioration, mainly manifested as scale formation, accumulation of particulate impurities, and deposition of corrosion products. These problems stem from factors such as calcium and magnesium ions, suspended solids, and microorganisms in the water source. Especially in environments with high water hardness or large temperature fluctuations, such as summer cooling water temperatures of 10-15℃ and winter hot water temperatures of 40-60℃, these conditions can easily lead to decreased system efficiency, increased energy consumption, and equipment damage.

[0004] Existing physical descaling technologies also include designs that utilize the self-powered flow of water for cleaning. For example, in Chinese utility model patent application CN219914109U, entitled "Heat Energy Recovery Circulating Water Cooling Equipment," a cleaning mechanism is installed within the heat exchange chamber. This mechanism includes a guide rod, a sliding component, and a support frame with bristles. Water flow through the inlet pipe impacts a guide plate, causing the sliding component and bristles to move unidirectionally along the guide rod to scrape the heat exchange surface. Subsequently, a valve switches the inlet and outlet water directions, reversing the water flow and resetting the bristles, thus achieving the reciprocating motion of the bristles to clean the scale. The cleaned scale ultimately falls into a collection chamber at the bottom for centralized discharge.

[0005] However, these mechanical cleaning solutions based on water flow reversal still have significant limitations, especially when dealing with hard scale commonly found in district cooling and heating systems: First, the cleaning action heavily relies on the system switching water flow directions. In continuously operating systems, this reversal operation may be inconvenient or impossible to perform frequently, resulting in low cleaning frequency and untimely cleaning. Second, flexible cleaning components such as brush bristles often lack sufficient scraping force to effectively break down the "bridging" structure of hard scale crystals that are firmly attached to the filter screen surface, especially inside the filter pores, leaving the risk of deep filter clogging still present.

[0006] Therefore, an integrated physical descaling and filtration device for circulating water in district cooling and heating systems is proposed to solve the aforementioned problems. Summary of the Invention

[0007] Technical problems to be solved

[0008] To address the aforementioned shortcomings of existing technologies, this invention provides an integrated physical descaling and filtration device for circulating water in district cooling and heating systems, which can solve the problem of filter screen clogging due to scale bridging in existing technologies.

[0009] Technical solution

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] This invention provides an integrated device for physical descaling and filtration of circulating water in a district cooling and heating system, comprising a treatment tank, an inlet pipe and a drain outlet connected to the treatment tank, and a filter screen disposed inside the treatment tank. The inlet pipe is arranged tangentially to the treatment tank to allow circulating water to enter the treatment tank tangentially to form a vortex. The drain outlet is disposed at the top of the treatment tank to discharge the filtered circulating water.

[0012] It also includes a cleaning mechanism, which includes a drive component and a scraping component linked to the drive component. The drive component converts the kinetic energy of water into mechanical energy, and the scraping component scrapes the inner and outer walls of the filter screen under the drive of the drive component.

[0013] Furthermore, the cleaning mechanism also includes an impact component connected to the drive component and periodically impacts the filter to cause it to move laterally.

[0014] The filter screen is installed below the drain outlet via an elastic suspension assembly and is used to filter circulating water. The elastic suspension assembly allows the filter screen to move horizontally when impacted and to automatically reset after the impact.

[0015] Furthermore, the elastic suspension assembly includes crossbars fixed to both sides of the drain outlet and sliders sleeved on the crossbars. A first spring is provided between the crossbars and the sliders. The upper end of the filter screen is connected to the sliders, so that the filter screen remains in a centered position under the elastic force of the first spring.

[0016] Furthermore, the impact assembly includes a push rod slidably mounted on the side wall of the processing tank and a fixing plate fixed to one end of the push rod. A second spring is provided between the fixing plate and the inner wall of the processing tank, and the push rod abuts against the surface of the filter screen under the elastic force of the second spring.

[0017] Furthermore, the drive assembly includes a control box disposed on the water inlet pipe and an impeller rotatably connected to the control box, wherein a gear is coaxially connected to the impeller;

[0018] The other end of the push rod is connected to a rack that meshes with a gear. The number of teeth on the gear is distributed at half its circumference, so that when the gear rotates, it periodically drives the rack to compress and release the second spring, thereby causing the push rod to strike the filter screen.

[0019] Furthermore, a protective cover is provided between the fixing plate and the inner wall of the treatment tank. The protective cover covers the surface of the second spring and is used to isolate the circulating water from impurities.

[0020] Furthermore, the scraping assembly includes an annular base fixedly connected to the bottom of the filter screen, a rotating ring rotatably connected inside the annular base, a mounting seat fixed on the rotating ring, an inner scraper elastically connected inside the mounting seat that abuts against the inner wall of the filter screen, and an outer scraper abutting against the outer wall of the filter screen connected below the mounting seat via a connecting rod.

[0021] The rotating ring is also connected to blades, which drive the rotating ring to rotate under the impact of the swirling water flow, thereby driving the inner and outer scrapers to scrape the filter screen.

[0022] Furthermore, the surface of the inner scraper is provided with cleaning teeth, the shape of which is adapted to the filter holes of the filter screen. When the filter screen is impacted and undergoes relative displacement, the cleaning teeth are inserted into the filter holes and push the dirt outward.

[0023] Furthermore, a frustum-shaped flow guide chamber is connected to the bottom of the treatment tank. The bottom of the flow guide chamber is provided with a drain port for collecting and discharging the cleaned dirt. The filter screen is frustum-shaped, and its inclined surface guides the dirt to slide down along the swirling direction.

[0024] Furthermore, the inner wall of the treatment tank is also provided with guide vanes to guide the dirt toward the drain outlet.

[0025] Beneficial effects

[0026] The technical solution provided by this invention has the following advantages compared with the prior art:

[0027] This device sets the inlet pipe along the tangential direction of the treatment tank and, together with the inner wall guide vanes, creates a strong and stable vortex after the circulating water enters. It uses centrifugal force to achieve primary descaling and throws denser impurities toward the tank wall.

[0028] Meanwhile, both the flow guide chamber below the treatment tank and the filter screen itself are designed with a frustum-shaped structure. The centrifugal force of the swirling flow pushes the dirt against the tank wall, while the conical slope provides a natural downward sliding channel for the dirt, allowing it to efficiently collect and be guided to the drain at the bottom under gravity and the flushing of subsequent water flow. This significantly improves the efficiency of primary descaling and final discharge. The conical structure reduces the possibility of dirt retention and secondary suspension at the bottom of the treatment tank, ensuring that the separated impurities can be quickly and continuously discharged from the system, thereby reducing the load on the filter screen.

[0029] Furthermore, this solution breaks away from the traditional fixed filter installation method, creatively constructing an elastic suspension system through a crossbar, slider, and first spring. The upper end of the filter is hung on the crossbar below the drain outlet via the slider and can move horizontally within a certain range. The preload of the first spring allows the filter to automatically maintain its centered position when no external force is applied. When the filter is impacted, it generates displacement and vibration, thereby loosening stubborn dirt. The spring's restoring ability ensures that the filter accurately returns to its centered position after each impact, guaranteeing the continuity and stability of the filtration process and achieving uninterrupted filtration during cleaning. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0031] Figure 1 This is an isometric schematic diagram of the physical descaling and filtration integrated device in an embodiment of the present invention;

[0032] Figure 2 This is a cross-sectional schematic diagram of the physical descaling and filtration integrated device in an embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional view of the internal structure of the processing tank in an embodiment of the present invention;

[0034] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0035] Figure 5 This is a schematic diagram of the internal structure of the water inlet pipe and control box in an embodiment of the present invention;

[0036] Figure 6 This is a cross-sectional schematic diagram of the filter structure in an embodiment of the present invention;

[0037] Figure 7 for Figure 6Enlarged schematic diagram of the structure at point B;

[0038] Figure 8 This is a schematic diagram of the inner and outer scraper structures in an embodiment of the present invention;

[0039] Figure 9 This is a schematic diagram of blade installation in an embodiment of the present invention.

[0040] The labels in the diagram represent: 1. Treatment tank; 2. Inlet pipe; 3. Flow guide chamber; 4. Drain outlet; 5. Top cover; 6. Drain outlet; 7. Filter screen; 8. Crossbar; 9. Slider; 10. First spring; 11. Control box; 12. Connecting shaft; 13. Impeller; 14. Push rod; 15. Fixing plate; 16. Second spring; 17. Rack; 18. Gear; 19. Protective cover; 20. Annular base; 21. Rotary ring; 22. Mounting base; 23. Inner scraper; 24. Connecting rod; 25. Outer scraper; 26. Ball bearing; 27. Folding spring; 28. Cleaning tooth; 29. ​​Connecting plate; 30. Blade. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0045] The present invention will be further described below with reference to embodiments.

[0046] Example:

[0047] Please refer to the appendix. Figure 1-9 This solution proposes an integrated physical descaling and filtration device for circulating water in a district cooling and heating system, comprising a treatment tank 1, an inlet pipe 2, a top cover 5, a drain outlet 6, and a filter screen 7. An inlet pipe 2, connected to the interior, is provided on the upper surface of the treatment tank 1. Circulating water to be descaled can be transported into the treatment tank 1 through the inlet pipe 2 for descaling and filtration.

[0048] The treatment tank 1 has a drain port 4 at the bottom to discharge the removed dirt; and a top cover 5 is connected to the top of the treatment tank 1. The top cover 5 has a drain port 6 that communicates with the inside of the treatment tank 1. The drain port 6 is used to discharge the filtered circulating water; thus, the descaling and filtration treatment of the circulating water is realized.

[0049] Specifically, the inlet pipe 2 is connected along the tangential direction of the cylindrical cavity of the treatment tank 1. When water with a certain pressure and flow rate rushes into the circular cavity of the treatment tank 1 from the tangential direction, it cannot move forward in a straight line, but will immediately flow along the inner wall of the circle, thereby causing the circulating water entering the treatment tank 1 to generate a swirling flow.

[0050] The inner wall of the treatment tank 1 is also equipped with guide vanes, which are designed with a specific arc angle, like a fixed turbine. When the water flows through these guide vanes, it is guided and shaped by the surface of the vanes, thus being forced to adopt a more regular and stronger rotation direction, ensuring that the vortex can be formed quickly and stably.

[0051] The treatment tank 1 is connected to a flow guide chamber 3 at the bottom. The flow guide chamber 3 is a frustum-shaped structure that is wider at the top and narrower at the bottom. The sewage outlet 4 is located below the flow guide chamber 3.

[0052] When the circulating water swirls within the treatment tank 1, a strong centrifugal force is generated inside the rotating fluid. This causes the centrifugal force on solid particles in the circulating water with a density greater than that of water, such as silt, scale, and rust, to be much greater than their own weight.

[0053] Under the strong centrifugal force, these heavier impurities are radially thrown against the inner circumference of the guide chamber 3. The impurities thrown against the inner wall of the guide chamber 3, driven by the subsequent water flow and their own gravity, spiral down along the inner wall of the guide chamber 3, eventually converging at the bottom of the conical guide chamber 3 and being continuously discharged from the drain outlet 4. The treatment tank 1, guide chamber 3, drain outlet 6, and filter screen 7 are arranged in concentric circles.

[0054] Meanwhile, relatively clean water is forced to converge towards the central axis area of ​​the rotating system. Due to the lower pressure in the central area, this clean water forms an upward internal vortex, passes through the filter screen 7, and flows out from the top drain outlet 6 to the next stage of the system.

[0055] Since the drain outlet 6 and the filter screen 7 are both integrated and installed on the top cover 5, after prolonged descaling and filtration, the top cover 5 can be removed to quickly disassemble the filter screen 7. By integrating the filter screen 7 and its related cleaning mechanism as a single module with the top cover 5, when cleaning or replacing the filter screen is required, simply removing the top cover 5 allows the entire filtration and self-cleaning module to be removed from the treatment tank 1.

[0056] This avoids the cumbersome process of traditional equipment that requires personnel to enter the equipment or disassemble complex pipelines for maintenance, significantly reducing downtime, labor intensity, and safety hazards. Furthermore, from outside the equipment, the entire removed module can be thoroughly cleaned manually, rinsed with high-pressure water, or chemically soaked to ensure the removal of all stubborn dirt.

[0057] At the same time, it also facilitates intuitive inspection of the wear of key moving parts such as the inner scraper 23, outer scraper 25, and cleaning teeth 28, allowing for timely replacement or adjustment and ensuring the long-term reliable operation of the self-cleaning system.

[0058] The difference lies in the fact that a concentrically arranged annular base 20 is connected to the bottom of the filter screen 7. A rotating ring 21 is rotatably connected to the annular base 20 via ball bearings 26. A mounting seat 22 is connected to the inner side of the rotating ring 21, and an inner scraper 23 is mounted on the mounting seat 22, abutting against the inner wall of the filter screen 7. Simultaneously, an outer scraper 25 is connected to the lower end of the mounting seat 22 via a connecting rod 24, and the outer scraper 25 abuts against the outer wall of the filter screen 7. This achieves simultaneous mechanical cleaning of the inner and outer surfaces of the filter screen 7.

[0059] Compared to traditional fixed filters or single-sided scraper cleaning, which easily leads to dirt accumulation on the uncleaned side, this design uses internal and external scrapers to simultaneously remove dirt adhering to the inner and outer walls of the filter, greatly reducing cleaning dead spots and effectively preventing dirt from accumulating and bridging in the filter pores, thus ensuring the long-term stable filtration capacity of the filter.

[0060] Meanwhile, blades 30 are connected to the rotating ring 21 via connecting plate 29. The blades 30 are arranged in several groups and are distributed in an evenly spaced circular pattern on the outside of the filter screen 7. When the circulating water enters the treatment tank 1 and forms a swirling flow, the water flow impacts the surface of the blades 30 during the flow process, thereby pushing the blades 30 to move and controlling the rotating ring 21 to rotate within the annular base 20.

[0061] During the rotation of the rotating ring 21, the inner scraper 23 and the outer scraper 25 are simultaneously controlled to scrape against the surface of the filter screen 7, which can remove the dirt from the surface of the filter screen 7. By constructing a water-driven rotating cleaning system and combining the clamping design of the inner and outer scrapers, the cleaning action is not just a simple scraping.

[0062] When the dirt is scraped off the inner wall of the filter screen 7 by the inner scraper 23, the presence of the outer scraper 25 can prevent it from being pushed back into the filter holes by the water flow or adhering to the outer wall. This combined action can more thoroughly remove the dirt from the surface of the filter screen and make it easier for it to be carried away by the swirling water flow in the treatment tank 1, promoting the directional transport and discharge of dirt.

[0063] It should be noted that both sides of the drain outlet 6 are connected to crossbars 8, and the upper end of the filter screen 7 is connected to two sets of sliders 9, which are respectively fitted onto the two sets of crossbars 8.

[0064] This allows the filter screen 7 to move horizontally to a certain extent below the drain outlet 6. The upper radius of the filter screen 7 is larger than the diameter of the drain outlet 6, ensuring that the filter screen 7 always covers the surface of the drain outlet 6 during its movement, effectively filtering the circulating water.

[0065] Furthermore, a first spring 10 is sleeved between the crossbar 8 and the slider 9. The two sets of first springs 10 always control the filter screen 7 to remain in the center position below the drain outlet 6, thereby ensuring that the drain outlet 6 and the filter screen 7 remain concentrically distributed when not affected by external forces.

[0066] By providing filter 7 with a controllable, self-resetting elastic suspension system, it can generate horizontal displacement and vibration upon external impact, thereby significantly enhancing the cleaning effect. Compared to static scraping cleaning, which may not be able to thoroughly remove dirt deeply embedded in the filter pores or with extremely strong adhesion, dynamic, multi-dimensional cleaning force can be applied by causing the entire filter to move macroscopically and vibrate at high frequency, more effectively breaking down the adhesion of dirt.

[0067] Meanwhile, a control box 11 is connected to the surface of the inlet pipe 2. An impeller 13 is rotatably connected inside the control box 11 via a connecting shaft 12. When circulating water is transported into the treatment tank 1 through the inlet pipe 2, the water flow will impact the impeller 13, causing the connecting shaft 12 to rotate. A push rod 14 is slidably installed on the side wall of the treatment tank 1. A fixing plate 15 is connected to the surface of one end of the push rod 14 located inside the treatment tank 1. A second spring 16 is connected between the fixing plate 15 and the inner wall of the treatment tank 1.

[0068] Under the elastic force of the second spring 16, the push rod 14 is always in contact with the surface of the filter screen 7. The end of the push rod 14 located outside the treatment tank 1 is connected to a rack 17, and the end of the connecting shaft 12 located outside the control box 11 is connected to a gear 18. The rack 17 and the gear 18 are meshed together.

[0069] When circulating water is conveyed from the inlet pipe 2 into the treatment tank 1, the water flow impacts the impeller 13, causing it to rotate clockwise. This, in turn, controls the connecting shaft 12 to drive the gear 18 to rotate clockwise. The gear 18 meshes with the rack 17, causing the push rod 14 to slide outward from the treatment tank 1, which in turn controls the fixing plate 15 to compress the second spring 16.

[0070] The number of teeth on the surface of gear 18 is half the circumference. Therefore, during the continuous circumferential rotation, gear 18 will engage the rack 17 at a distance away from the sliding end of the processing barrel 1. When it can no longer engage the rack 17, the push rod 14 will quickly reset under the elastic force of the second spring 16 and strike the surface of the filter screen 7.

[0071] The filter screen 7 is moved laterally below the drain outlet 6, and during the movement, the elastic force of the first springs 10 on both sides is changed by the two sets of sliders 9. The kinetic energy of the water flow is converted into periodic, high-intensity mechanical impact force and transmitted to the filter screen 7, causing it to vibrate and move at high frequency.

[0072] This causes the entire filter screen 7 to vibrate strongly, effectively loosening and peeling away stubborn dirt. Combined with the rotating scraper, this creates a dynamic vibration and static scraping cleaning effect, fundamentally solving the problem of filter clogging. Furthermore, the driving source for this mechanism is the water flow itself.

[0073] When the system has a large circulating water volume and high flow rate, it usually means that more impurities are introduced. The impeller 13 rotates faster, and the frequency of the push rod 14 hitting the filter screen 7 also increases, automatically enhancing the cleaning power. Conversely, during periods of low flow, the cleaning frequency decreases. This adaptability ensures that the cleaning efficiency matches the system load, avoiding energy waste.

[0074] Utilizing a semi-gear design, the push rod 14 compresses the second spring 16 to store energy during the toothed half-cycle of the gear 18; during the toothless half-cycle of the gear 18, the second spring 16 is allowed to release its elastic potential energy instantaneously, driving the push rod 14 to impact the filter screen 7 at high speed. Compared to cleaning methods that apply constant pressure, this instantaneous release of pulsed impact energy generates greater instantaneous acceleration, which is more effective in overcoming the static friction of dirt, achieving a penetrating cleaning effect, while avoiding the wear that continuous high pressure may cause to the filter screen.

[0075] A protective cover 19 is also connected between the fixed plate 15 and the inner wall of the treatment tank 1. The protective cover 19 covers the surface of the second spring 16. As a sealed shell, the main function of the protective cover 19 is to physically isolate the second spring 16 from the circulating water and impurities inside the treatment tank 1. It forms a closed or semi-closed protective space, protecting the critical elastic element, the second spring 16, from the direct impact and contamination of the working medium.

[0076] It is worth noting that the inner scraper 23 is connected to the mounting base 22 by a folding spring 27. Under the elastic force of the folding spring 27, the inner scraper 23 always abuts against the inner wall of the filter screen 7, automatically compensating for any slight non-roundness of the filter screen or wear of the scraper itself, and ensuring constant contact.

[0077] Furthermore, when the entire filter screen 7 is impacted by the push rod 14 and undergoes rapid lateral displacement, the inner scraper 23, connected by a spring, will experience inertia due to its mass, resulting in a slight delay or lag in its motion response relative to the filter screen.

[0078] When the filter screen 7 moves laterally due to the impact, while the inner scraper 23 remains in place due to inertia, a violent instantaneous relative motion is generated between the two. The cleaning teeth 28 can instantly insert into the pores of the filter screen, pushing out stubborn dirt that is blocking or deeply embedded in the pores, such as bridging crystals, achieving a deep cleaning of the inside of the filter pores, which is difficult to achieve with traditional continuous rotating scraping.

[0079] Furthermore, during each impact and reset cycle, the inertial hysteresis between the inner scraper 23 and the filter screen 7, along with the repeated extension and contraction of the spring, causes the inner scraper 23 to generate high-frequency micro-vibrations. This vibration helps to loosen the sticky dirt, such as biofilm, that is tightly bound to the filter screen surface, making it easier to scrape off, thus creating a synergistic effect with the scraping action of the cleaning teeth.

[0080] It should be noted that the surface of the inner scraper 23 is also provided with evenly distributed cleaning teeth 28, which are compatible with the filter holes of the filter screen 7.

[0081] When the inner scraper 23 is impacted by the push rod 14 and moves relative to the filter screen 7 under the elastic force of the cleaning teeth 28, the cleaning teeth 28 will be inserted into the filter holes on the surface of the filter screen 7, and push the dirt on the inside of the filter screen 7 and the dirt scraped off the inner wall to the outside of the filter screen 7, and be scraped off by the outer scraper 25 on the outside of the filter screen 7, so that the dirt cleaned off the filter screen 7 will be discharged from the drain port 4 along with the swirling flow.

[0082] Compared to traditional scrapers that can only clean the surface of the filter screen and are ineffective against dirt crystals that form bridging structures between the filter pores, the cleaning teeth 28 can directly insert into the interior of the filter pores, physically destroying and disintegrating these bridging structures, thoroughly removing deep-seated blockages, fundamentally solving the problem of filter screen failure due to pore blockage, ensuring long-term unobstructed flow in the filter channel, and exposing the dirt inside the filter pores to the outer space of the filter screen 7 after the cleaning teeth 28 push it out.

[0083] At this time, the outer scraper 25, which is always in contact with the outer wall of the filter screen, will immediately scrape off the dirt that has been pushed out and let it fall into the vortex of the treatment tank 1, forming an efficient dirt treatment production line: internal pushing out, external scraping off, and vortex carrying away, avoiding secondary adhesion or clogging of dirt during the cleaning process. In particular, the effective work of the cleaning teeth 28 depends on the lateral displacement of the filter screen caused by the impact of the push rod 14.

[0084] This pulsed impact provides the cleaning teeth 28 with tremendous instantaneous acceleration, giving them greater breaking power to tackle particularly stubborn deposits. This perfectly complements the continuous, gentle cleaning force provided by the rotating scraper.

[0085] The filter screen 7 is also designed in a frustum shape, which allows the dirt scraped off the surface of the filter screen 7 to be better washed away by the continuous flow. The truncated cone-shaped slope provides a natural gravity slide for the dirt cleaned by the scraper. Under the action of gravity, the dirt will automatically move downward along the conical slope of the filter screen 7, avoiding possible retention or re-adhesion on the vertical filter screen surface.

[0086] Furthermore, the swirling flow inside the treatment tank 1 moves from top to bottom, and the frustum-shaped filter screen 7 is more aligned with the direction of the rotating water flow, which can reduce the flow resistance and energy loss when the water flow impacts the filter screen.

[0087] This allows the rotating water flow to flow more smoothly along the cone surface of the filter screen, forming a stronger fluid shear force. This more quickly and thoroughly carries away the dirt sliding down the slope and flushes it towards the drain outlet 4 at the bottom. It reduces local resistance such as sudden expansion and contraction when the water flows through the filter screen, and the water flow can pass through the filter screen more smoothly. This helps to reduce the pressure drop on both sides of the filter screen. For a circulating water system, this means that the pumping energy consumption required to overcome the filtration resistance is reduced, thereby improving the operating energy efficiency of the entire system.

[0088] Furthermore, the impeller 13 is driven to rotate by the water flow, which in turn drives a half-tooth gear 18 to rotate via the connecting shaft 12. The gear 18 periodically engages and releases the rack 17, causing the push rod 14 to compress the second spring 16 and then suddenly release it, thus impacting the filter screen 7 at high speed. This mechanism ingeniously converts the kinetic energy of the water flow into mechanical energy and stores it in the spring, ultimately releasing it to the filter screen 7 in the form of pulse impacts. This generates high-intensity, periodic mechanical impacts, providing powerful kinetic energy for filter screen cleaning. This pulse impact can effectively destroy the bridging structure formed by hard scale crystals on the surface and within the pores of the filter screen, solving the problem of insufficient ability of traditional scraping methods to handle deep and stubborn dirt. At the same time, its driving force comes entirely from the system's own water flow, achieving energy saving and self-adaptation, that is, the greater the water flow, the higher the cleaning frequency.

[0089] A blade 30 is installed on the rotating ring 21 below the filter screen 7. The swirling impact blade 30 drives the rotating ring 21 to rotate. The inner scraper 23 and the outer scraper 25 are connected to the rotating ring 21 through the mounting base 22 and the connecting rod 24, realizing synchronous and continuous scraping of the inner and outer walls of the filter screen 7. This system works in parallel with the pulse impact system mentioned above to form a composite cleaning mode.

[0090] The inner and outer double scraper design achieves full-surface cleaning of the filter screen 7, greatly reducing cleaning dead corners. The rotating scraper can continuously remove loose deposits on the surface of the filter screen 7, complementing the targeted bursting of the pulse impact. This mechanism is also driven by water flow, requiring no external power. It has a compact structure and provides stable and continuous baseline cleaning capability. Furthermore, the inner scraper 23 is not rigidly fixed, but is elastically connected to the mounting base 22 through the folding spring 27. Its surface is provided with cleaning teeth 28 that are adapted to the shape of the filter screen 7 pores. When the filter screen 7 is impacted and moves laterally, the inner scraper 23 temporarily remains in place due to inertia, and the cleaning teeth 28 will instantly insert into the pores of the filter screen 7, thereby converting the macroscopic vibration of the filter screen 7 into a microscopic cleaning action targeting the inside of the filter pores.

[0091] The cleaning teeth 28 precisely push out the dirt clogging the pores, achieving deep cleaning. The folding spring 27 ensures a constant pressure of the scraper on the filter screen 7 wall and also provides the possibility for inertial cleaning. The cleaning action is no longer surface scraping, but deep insertion and scraping into the pores, making it highly targeted.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated device for physical descaling and filtration of circulating water in a district cooling and heating system, comprising a treatment tank (1), an inlet pipe (2) and a drain outlet (6) connected to the treatment tank (1), and a filter screen (7) disposed within the treatment tank (1), characterized in that, The inlet pipe (2) is arranged along the tangential direction of the treatment tank (1) to allow the circulating water to enter the treatment tank (1) tangentially to form a vortex; the outlet (6) is located at the top of the treatment tank (1) to discharge the filtered circulating water. It also includes a cleaning mechanism, which includes a drive component and a scraping component linked to the drive component. The drive component converts the kinetic energy of water into mechanical energy, and the scraping component scrapes the inner and outer walls of the filter screen (7) under the drive of the drive component. The cleaning mechanism also includes an impact component, which is connected to the drive component and periodically impacts the filter (7) to cause it to move laterally; The filter screen (7) is installed below the drain outlet (6) by an elastic suspension assembly and is used to filter the circulating water. The elastic suspension assembly allows the filter screen (7) to move horizontally when it is impacted and to automatically reset after the impact. The elastic suspension assembly includes a crossbar (8) fixed to both sides of the drain outlet (6) and a slider (9) sleeved on the crossbar (8). A first spring (10) is provided between the crossbar (8) and the slider (9). The upper end of the filter screen (7) is connected to the slider (9), so that the filter screen (7) is kept in the center position under the elastic force of the first spring (10). The impact assembly includes a push rod (14) slidably mounted on the side wall of the processing tank (1) and a fixing plate (15) fixed to one end of the push rod (14). A second spring (16) is provided between the fixing plate (15) and the inner wall of the processing tank (1). The push rod (14) abuts against the surface of the filter screen (7) under the elastic force of the second spring (16). The scraping assembly includes an annular base (20) fixedly connected to the bottom of the filter screen (7), a rotating ring (21) rotatably connected inside the annular base (20), a mounting seat (22) fixed on the rotating ring (21), an inner scraper (23) elastically connected inside the mounting seat (22) and a scraper (25) abutting against the inner wall of the filter screen (7), and an outer scraper (25) abutting against the outer wall of the filter screen (7) connected below the mounting seat (22) via a connecting rod (24). The rotating ring (21) is also connected to blades (30). The blades (30) drive the rotating ring (21) to rotate under the impact of the swirling water flow, thereby driving the inner scraper (23) and the outer scraper (25) to scrape the filter screen (7). The drive assembly includes a control box (11) mounted on the water inlet pipe (2) and an impeller (13) rotatably connected to the control box (11). The impeller (13) is coaxially connected to a gear (18). The other end of the push rod (14) is connected to a rack (17) that meshes with the gear (18). The number of teeth of the gear (18) is distributed at half its circumference, so that when the gear (18) rotates, it periodically drives the rack (17) to compress the second spring (16) and release it, thereby driving the push rod (14) to strike the filter screen (7).

2. The integrated physical descaling and filtration device for circulating water in a district cooling and heating system according to claim 1, characterized in that, A protective cover (19) is also provided between the fixing plate (15) and the inner wall of the treatment tank (1). The protective cover (19) covers the surface of the second spring (16) and is used to isolate the circulating water from impurities.

3. The integrated physical descaling and filtration device for circulating water in a district cooling and heating system according to claim 2, characterized in that, The processing tank (1) is connected to a flow guide chamber (3) with a frustum-shaped structure. The bottom of the flow guide chamber (3) is provided with a drain port (4) for collecting and discharging the cleaned dirt. The filter screen (7) is frustum-shaped, and its inclined surface guides the dirt to slide down along the swirling direction.

4. The integrated physical descaling and filtration device for circulating water in a district cooling and heating system according to claim 1, characterized in that, The inner wall of the treatment tank (1) is also provided with a guide plate for guiding the dirt to move towards the drain (4).

5. The integrated physical descaling and filtration device for circulating water in a district cooling and heating system according to claim 4, characterized in that, The inner scraper (23) is provided with cleaning teeth (28) on its surface. The shape of the cleaning teeth (28) is adapted to the filter holes of the filter screen (7). When the filter screen (7) is impacted and undergoes relative displacement, the cleaning teeth (28) insert into the filter holes and push the dirt outward.

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