Energy-saving device for fresh air system of central air conditioner

Abstract

The application relates to the technical field of central air conditioning fresh air systems, and discloses an energy-saving device for an energy-saving central air conditioning fresh air system, which comprises two air guide systems, the air guide system comprises a machine box, the machine box is respectively provided with a filtering station, a reverse cleaning station and a rotating drum, two symmetrical filter components are installed on the rotating drum, the filter component comprises an air cylinder and a transmission component installed on the rotating drum, the rotating speed of the transmission component on the filtering station and the reverse cleaning station is different, a flinging seat capable of reciprocating in the up-down direction and the left-right direction and an inner pull shaft capable of alternating forward and reverse rotation are in transmission connection on the transmission component, the reciprocating frequency and the moving stroke of the flinging seat are cyclically changed, and an outer pull shaft is rotatably arranged on the inner pull shaft. The multi-dimensional cleaning system adopting the multistage nested composite corrugated unit, the first Fe3O4 magnetic microparticle and the magnetic fluid extrusion, when filtering, the composite corrugated unit is folded to form a multilayer dense filter screen, the adsorption of the first Fe3O4 magnetic microparticle is combined, and the high-efficiency interception of small particles is realized.

Description

Technical Field

[0001] This invention relates to the field of central air conditioning fresh air system technology, and more specifically, to an energy-saving device for an energy-saving central air conditioning fresh air system. Background Technology

[0002] In the prior art, patent document CN117760025A discloses an energy-saving device for a central air conditioning fresh air system. This device realizes that when the filter pores are blocked and the permeability is reduced, the filter strip is repositioned after deformation under the action of wind. The piston moves slowly and then quickly in the third sliding groove, which drives the filter strip to oscillate and rub against each other during the repositioning process. This achieves automatic cleaning of the surface of the filter strip and the inside of the formed filter pores, ensuring the filtration effect and permeability of the filter frame, reducing the operating load of the unit, extending the service life of the unit, and reducing subsequent operation and maintenance costs. However, the above device has the following technical problems: the prior art mainly relies on the deformation and repositioning of the filter element under the action of wind or simple airflow backflushing. This single cleaning method is difficult to deal with the adhesion of complex pollutants, especially for particles and sticky impurities in deep pores. The cleaning effect is limited. Existing filter elements mostly adopt a planar or simple corrugated structure, which easily forms a "filter cake layer" during filtration, resulting in increased airflow resistance. Moreover, it is difficult to achieve efficient sewage discharge through structural deformation during backflushing.

[0003] Based on this, the present invention provides an energy-saving device for a central air conditioning fresh air system to solve the technical problems mentioned in the background art. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides an energy-saving device for a central air conditioning fresh air system. This invention adopts a multi-dimensional cleaning system consisting of multi-level nested composite corrugated units, first Fe3O4 magnetic particles, and magnetic fluid extrusion. During filtration, the composite corrugated units fold to form a multi-layered dense filter screen, which, combined with the adsorption effect of the first Fe3O4 magnetic particles, achieves efficient interception of tiny particles.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving device for a central air conditioning fresh air system, comprising two air guiding systems. A filtration station, a backwashing station, and a rotating drum are respectively provided on the casing. Two symmetrically arranged air-filtering components are installed on the rotating drum. Each air-filtering component includes an air duct mounted on the rotating drum and a transmission component. The transmission component rotates at different speeds at the filtration station and the backwashing station. A swinging seat that can reciprocate in the vertical and horizontal directions and an inner pull shaft that can alternately rotate forward and backward are connected to the transmission component. The reciprocating frequency and stroke of the swinging seat change cyclically. An outer pull shaft is rotatably sleeved on the inner pull shaft, and the outer pull shaft is rotatably mounted on the swinging seat. The outer pull shaft rotates coaxially and in opposite directions with the inner pull shaft. A magnetic filter element is installed at the bottom end of the outer pull shaft. A ventilation assembly communicating with the magnetic filter element is provided on the casing. The magnetic filter element revolves with the rotating drum and cycles between filtration and backwashing states. A positioning shaft is installed at the bottom of the air duct, and an eccentric bladder column is installed between the inner pull shaft and the positioning shaft. A reciprocating screw that can periodically alternate forward and reverse is rotatably installed on the outside of the air duct. Two symmetrically arranged electromagnetic arc blocks with a reciprocatingly changing spacing are connected to the reciprocating screw. The magnetic field strength of the electromagnetic arc blocks changes periodically. A transformer cylinder connected to the inner cavity of the eccentric bladder column is installed at the bottom of the air duct. Both the transformer cylinder and the eccentric bladder column are filled with magnetic fluid. The magnetic fluid in the transformer cylinder is driven by the reciprocating screw and reciprocally squeezed into the eccentric bladder column. The magnetic filter element includes an elastic matrix with multiple composite corrugated units. First Fe3O4 magnetic particles coated with oleic acid are uniformly dispersed in the elastic matrix, and an elastic skeleton is built into the elastic matrix.

[0006] As a preferred embodiment of the present invention, the device further includes a housing, the chassis being fixedly connected to the housing, two motors being mounted on the chassis, each of the output shafts of the two motors being equipped with a drive gear, a gear cylinder being rotatably sleeved on the rotating drum, a drive gear ring being mounted on the gear cylinder, and a driven gear ring being mounted on both the gear cylinder and the rotating drum, the two drive gears being meshed with the two driven gear rings respectively, and a corrugated sealing cover being rotatably mounted on the outer pull shaft, the corrugated sealing cover being fixedly connected to the air duct.

[0007] As a preferred embodiment of the present invention, a differential shaft is rotatably mounted on the chassis at positions corresponding to the filtration station and the backwashing station. Differential gears that mesh with the drive gear ring are mounted on both differential shafts. A low-speed ratio gear is mounted on the differential shaft in the filtration station, and a high-speed ratio gear is mounted on the differential shaft in the backwashing station. Both the low-speed ratio gear and the high-speed ratio gear are connected to the transmission components.

[0008] In a preferred embodiment of the present invention, the transmission component includes a tension seat and a bracket mounted on a rotating drum. A main shaft, a secondary shaft, and a vertical lead screw are rotatably mounted on the bracket. Two transmission gears are mounted on the main shaft, and these gears are respectively adapted and connected to a low-speed ratio gear and a high-speed ratio gear. A synchronous toothed belt provides a transmission connection between the secondary shaft and the vertical lead screw. A main shaft sleeve driven by the main shaft, a secondary shaft sleeve linked to the secondary shaft, a synchronous shaft, and a horizontal lead screw are rotatably mounted on the tension seat. A large-angle sector gear and a small-angle sector gear are respectively mounted on the main shaft sleeve. The main shaft sleeve is positioned between the corresponding large-angle sector gear and small-angle sector gear. Two symmetrically arranged transmission interruption zones are provided. Two synchronous gears are installed on the secondary shaft sleeve. The two synchronous gears are respectively adapted and connected to the large-angle sector gear and the small-angle sector gear. First bevel gears are installed on both the synchronous shaft and the horizontal lead screw. The two first bevel gears are orthogonally meshed. Torsion springs are provided at the rotational connection between the vertical lead screw and the bracket, the rotational connection between the horizontal lead screw and the tension seat, the rotational connection between the inner pull shaft and the swing seat, and the rotational connection between the reciprocating lead screw and the air duct. An elastic transmission belt is installed on the secondary shaft sleeve. The synchronous shaft and the inner pull shaft are both connected to the elastic transmission belt. The elastic transmission belt is made of elastic rubber.

[0009] As a preferred embodiment of the present invention, the central angle corresponding to the large-angle sector gear is 200°, the central angle corresponding to the small-angle sector gear is 120°, the central angle corresponding to the two transmission interruption zones is 20°, the radii of the large-angle sector gear and the small-angle sector gear are the same, and the radii of the two synchronous gears are the same. The radius of the large-angle sector gear is 6 to 11 times the radius of the synchronous gear. The main shaft sleeve has a first through groove with both ends through and slidingly connected to the main shaft. The secondary shaft sleeve has a second through groove with both ends through and slidingly connected to the secondary shaft. The cross-sections of the first through groove, the second through groove, the main shaft, and the secondary shaft are all regular polygons.

[0010] As a preferred embodiment of the present invention, a reciprocating gear is installed on the reciprocating screw, a half-tooth gear is installed at the bottom of the main shaft, the half-tooth gear is connected to the reciprocating gear, a positive thread section and a negative thread section are symmetrically arranged on the reciprocating screw, two electromagnetic arc blocks are respectively connected to the positive thread section and the negative thread section, a limiting guide groove is fixedly opened on the air duct and is slidably connected to the electromagnetic arc block, and the central angle corresponding to the electromagnetic arc block is 30°.

[0011] As a preferred embodiment of the present invention, the ventilation assembly includes an inlet pipe and an outlet pipe installed at both ends of the casing. An exhaust pipe is installed at the bottom of the air duct. The exhaust pipe is rotatably connected to the magnetic filter element. The positioning shaft is rotatably installed on the exhaust pipe. A set of ventilation holes is opened on the exhaust pipe at a position corresponding to the inner side of the air duct. The exhaust pipe is fixedly connected to the rotating cylinder and adapted to connect with the inner cavity of the inlet pipe. An exhaust ring is rotatably installed on the outer pull shaft. An air guide channel is fixedly opened inside the outer pull shaft. The two ends of the air guide channel are respectively connected to the exhaust ring and the inner cavity of the magnetic filter element. A corrugated connecting pipe is installed on the exhaust ring. The other end of the corrugated connecting pipe is fixedly connected to the rotating cylinder and adapted to connect with the inner cavity of the outlet pipe. An ash discharge valve connected to the exhaust pipe in the reverse cleaning state is installed on the inlet pipe. A reverse cleaning gas inlet pipe connected to the corrugated connecting pipe in the reverse cleaning state is installed on the outlet pipe.

[0012] As a preferred embodiment of the present invention, a reciprocating piston is slidably installed inside the transformer cylinder, and the reciprocating screw is drivenly connected to the reciprocating piston. A liquid guide channel communicating with the inner cavity of the eccentric bladder column is fixedly opened inside the positioning shaft. The liquid guide channel is connected to the inner cavity of the transformer cylinder. A central rotating shaft is rotatably installed on the swing seat. A central rotating bevel gear is installed on the central rotating shaft. A second bevel gear is installed on both the outer pull shaft and the inner pull shaft. Both second bevel gears are drivenly connected to the central rotating bevel gear. The two second bevel gears are respectively arranged on both sides of the central rotating bevel gear.

[0013] As a preferred embodiment of the present invention, the magnetic fluid comprises the following material components: a magnetic agent, a surfactant, and a base liquid. The magnetic agent is a second Fe3O4 magnetic microparticle with a size of 2nm-10nm. The surfactant is oleic acid, which coats the surface of the second Fe3O4 magnetic microparticle. The base liquid is silicate oil. When the electromagnetic arc block applies a periodically changing magnetic field, the magnetic fluid generates directional flow and compressive stress due to magnetic action, driving the eccentric capsule column to deform and forcibly compress the magnetic filter element, thereby causing the magnetic filter element to deform and discharge the dirt adhering to it.

[0014] As a preferred embodiment of the present invention, the composite corrugated unit is composed of multi-level nested peak-valley corrugations. The corrugation depth of the composite corrugated unit is 0.5mm-2mm, the corrugation spacing is 1mm-3mm, and the waveform of the composite corrugated unit is a sine wave. In a non-stretched state, the composite corrugated unit can be folded and compressed along the axial direction to form a multi-layer dense filter screen with a filtration accuracy of 0.1μm-1μm. The particle size of the first Fe3O4 magnetic particles is 5nm-20nm. When the electromagnetic arc block applies an alternating magnetic field, the first Fe3O4 magnetic particles generate a composite multi-dimensional vibration of axial vibration, radial oscillation, and circumferential vortex, driving the formation of high-frequency micro-eddy currents inside the magnetic filter element, which promotes the removal of residual dirt from the filter pores of the magnetic filter element. The elastic skeleton is composed of a spiral nickel-titanium shape memory alloy wire and a carbon fiber braided layer. The elastic skeleton is conformally fixed with the composite corrugated unit, and the elastic matrix is ​​a polyurethane elastomer composite material.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. To address the shortcomings of existing filter cartridges, such as simple structure and reliance on single-force airflow vibration for backwashing, this invention employs a multi-dimensional cleaning system combining multi-level nested composite corrugated units, first Fe3O4 magnetic particles, and magnetic fluid compression. During filtration, the composite corrugated units fold to form a multi-layered dense filter screen. Combined with the adsorption effect of magnetic particles, this achieves efficient interception of microparticles. During backwashing, an electromagnetic arc block generates an alternating magnetic field, driving the first Fe3O4 magnetic particles to form a composite motion of axial vibration, radial oscillation, and circumferential eddy current. Simultaneously, the magnetic fluid drives the eccentric column through a reciprocating screw to periodically compress the filter cartridge, causing the filter cartridge pores to expand and contract. Under this dual action, the efficiency of removing pollutants from deep pores is improved. Compared to the traditional single-force airflow vibration plus friction cleaning method, this invention solves the technical bottlenecks of difficult removal of sticky pollutants and deep clogging of the filter cartridge.

[0017] 2. To address the problem that existing technologies use fixed rotation speeds for filtration and backwashing, which cannot balance efficiency and energy consumption, this invention employs an innovative design of a differential shaft and high / low speed ratio gears. This allows the transmission components to operate stably at low speeds in the filtration station and at high speeds and high frequencies in the backwashing station. Specifically, during filtration, the low-speed ratio gear drives the inner pull shaft to rotate stably, while the outer pull shaft rotates in the opposite direction to form a micro-swirling flow field, significantly improving the adsorption efficiency for particles ranging from 0.1μm to 1μm. During backwashing, the high-speed ratio gear drives the swing seat to achieve a variable-frequency reciprocating motion of "rapid rise and slow fall," which, combined with the high-speed alternating forward and reverse rotation of the inner pull shaft, forms a three-dimensional cleaning force of "axial vibration, circumferential swinging, and radial extrusion," thoroughly removing stubborn pollutants.

[0018] 3. To address the issues of filter element deformation and cleaning dead zones caused by existing rigid transmissions, this invention employs a flexible linkage structure consisting of an elastic transmission belt, a torsion spring, and a bevel gear set. The main and auxiliary bushings transmit torque through a regular polygonal cross-section. Combined with the alternating meshing of large and small angle sector gears, the swing seat forms a "long stroke, low speed; short stroke, high speed" cyclic motion mode in both the vertical and horizontal directions. During filtration, the low-speed, stable reciprocating motion prevents localized pressure deformation of the filter element and maintains stable airflow resistance. During backwashing, the high-frequency variable stroke motion covers the entire surface of the filter element. Combined with the reverse rotation of the inner pull shaft, it eliminates the cleaning blind zones of traditional single-direction motion. This design improves the surface cleaning coverage of the filter element, reduces mechanical impact, and significantly enhances system reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an energy-saving device for an energy-saving central air conditioning fresh air system according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the air inlet pipe and air outlet pipe of the present invention;

[0021] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0022] Figure 4 This is a schematic cross-sectional view of the air outlet pipe and reciprocating lead screw of the present invention;

[0023] Figure 5 For the present invention Figure 4 A magnified view of the structure at point B in the middle;

[0024] Figure 6 For the present invention Figure 4 A magnified schematic diagram of the structure at point C in the middle;

[0025] Figure 7 This is a schematic diagram of the structure of the toothed cylinder and the air duct of the present invention;

[0026] Figure 8 This is a schematic diagram of the corrugated sealing cover and reciprocating gear of the present invention;

[0027] Figure 9 For the present invention Figure 8 A magnified schematic diagram of the structure at point D.

[0028] In the diagram: 1. Chassis; 2. Rotary drum; 3. Air duct; 4. Swinging seat; 5. Inner pull shaft; 6. Outer pull shaft; 7. Magnetic filter element; 8. Positioning shaft; 9. Eccentric cylinder; 10. Reciprocating lead screw; 11. Electromagnetic arc block; 12. Transformer cylinder; 13. Housing; 14. Motor; 15. Gear cylinder; 16. Drive gear ring; 17. Differential shaft; 18. Differential gear; 19. Low-speed ratio gear; 20. High-speed ratio gear; 21. Bracket; 22. Main shaft; 23. Countershaft; 24. Vertical lead screw; 25. Transmission gear; 26. Main shaft sleeve; 27. Secondary shaft sleeve; 28. Synchronous shaft; 29. ​​Flat lead screw; 30. Torsion spring; 31. Elastic transmission belt; 32. Half gear; 33. Air inlet pipe; 34. Air outlet pipe; 35. Exhaust pipe; 36. Vent hole; 37. Exhaust ring; 38. Ash discharge valve; 39. Backwash gas inlet pipe; 40. Reciprocating piston; 41. Central shaft; 42. Corrugated sealing cover; 43. Reciprocating gear; 44. Large angle sector gear; 45. Small angle sector gear; 46. Synchronous gear; 47. Tensioner seat. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 9 As shown, this invention provides an energy-saving device for a central air conditioning fresh air system, comprising two air guiding systems: one for intake air into the room and the other for exhaust air outwards. It also includes a housing 13, with a casing 1 fixedly connected to the housing 13. Two motors 14 are mounted on the casing 1, each with a drive gear mounted on its output shaft. A gear cylinder 15 is rotatably mounted on a rotating drum 2, with a drive gear ring 16 mounted on the gear cylinder 15. Both the gear cylinder 15 and the rotating drum 2 have driven gear rings mounted on them. The two drive gears mesh with the two driven gear rings respectively. A corrugated sealing cover 42 is rotatably mounted on an outer pull shaft 6, and is fixedly connected to the air duct 3. The two motors 14 drive the drive gears to rotate, and the drive gears mesh with the driven gear rings on the gear cylinder 15 and the rotating drum 2, thereby driving the rotating drum 2 and the gear cylinder 15 to rotate. In this energy-saving central air conditioning fresh air system, this transmission structure can stably provide power support for subsequent filtration and backwashing operations.

[0031] The casing 1 is equipped with a filtration station, a backwashing station, and a rotating drum 2. Two symmetrically arranged air filtration components are installed on the rotating drum 2. The air filtration components include an air duct 3 installed on the rotating drum 2 and a transmission component. The transmission component rotates at different speeds in the filtration station and the backwashing station. The design of the transmission component rotating at different speeds in the filtration station and the backwashing station allows the air filtration components to play different roles in different stations. In the filtration station, the low-speed ratio gear 19 keeps the transmission component rotating at a lower speed, ensuring that the magnetic filter element 7 has enough time and stability to filter the air.

[0032] At the back-cleaning station, the high-speed gear 20 enables the transmission components to rotate at a high speed, allowing for rapid and effective back-cleaning of the magnetic filter element 7. When the air-filtering component rotates with the rotating drum 2 to the filtration station, the low-speed gear 19 engages with the transmission components to drive the swing seat 4 and the inner pull shaft 5 to move at a slower speed and frequency, ensuring that the magnetic filter element 7 stably filters the air. When rotating to the back-cleaning station, the high-speed gear 20 engages with the transmission components to accelerate the movement speed and frequency of the swing seat 4 and the inner pull shaft 5, providing power for the back-cleaning operation. Compared with existing technologies, traditional fresh air systems use the same rotation speed for filtration and back-cleaning operations, which cannot be optimized according to different operating conditions. The differential speed design of this invention can improve filtration efficiency and back-cleaning effect, effectively solving the problems of incomplete filtration and untimely back-cleaning, extending the service life of the magnetic filter element 7, and reducing the system maintenance cost.

[0033] The transmission component is connected to a swing seat 4 that can reciprocate in the up-down and left-right directions and an inner pull shaft 5 that can alternately rotate forward and backward. The reciprocating frequency and stroke of the swing seat 4 change cyclically. A differential shaft 17 is rotatably mounted on the housing 1 at positions corresponding to the filtration station and the backwashing station. Differential gears 18 that mesh with the drive gear ring 16 are mounted on both differential shafts 17. A low-speed ratio gear 19 is mounted on the differential shaft 17 in the filtration station, and a high-speed ratio gear 20 is mounted on the differential shaft 17 in the backwashing station. Both the low-speed ratio gear 19 and the high-speed ratio gear 20 are connected to the transmission component. The transmission component includes a tension seat 47 and a bracket 21 mounted on the rotating drum 2. The bracket 21 is rotatably mounted with a main shaft 22, a secondary shaft 23, and a vertical lead screw 24. Two transmission gears 25 are mounted on the main shaft 22, and these gears are respectively adapted to and connected to a low-speed ratio gear 19 and a high-speed ratio gear 20. A synchronous toothed belt connects the secondary shaft 23 and the vertical lead screw 24. The tension seat 47 is rotatably mounted with a main shaft sleeve 26 driven by the main shaft 22, a secondary shaft sleeve 27 linked to the secondary shaft 23, a synchronous shaft 28, and a horizontal lead screw 29. A large-angle sector gear 44 and a small-angle sector gear 45 are mounted on the main shaft sleeve 26. Two symmetrically arranged transmission gears are positioned between the corresponding large-angle sector gear 44 and small-angle sector gear 45 on the main shaft sleeve 26. Interruption zone; two synchronous gears 46 are installed on the secondary bushing 27, which are respectively adapted and connected to the large angle sector gear 44 and the small angle sector gear 45. First bevel gears are installed on the synchronous shaft 28 and the horizontal lead screw 29. The two first bevel gears mesh orthogonally. Torsion springs 30 are provided at the rotational connection between the vertical lead screw 24 and the bracket 21, the rotational connection between the horizontal lead screw 29 and the tension seat 47, the rotational connection between the inner pull shaft 5 and the swing seat 4, and the rotational connection between the reciprocating lead screw 10 and the air duct 3. An elastic transmission belt 31 is installed on the secondary bushing 27. The synchronous shaft 28 and the inner pull shaft 5 are both connected to the elastic transmission belt 31. The elastic transmission belt 31 is elastic. The material is rubber; the center angle of the large angle sector gear 44 is 200°, the center angle of the small angle sector gear 45 is 120°, and the center angles of the two transmission interruption zones are both 20°. The radii of the large angle sector gear 44 and the small angle sector gear 45 are the same, and the radii of the two synchronous gears 46 are the same. The radius of the large angle sector gear 44 is 10 times the radius of the synchronous gear 46. The main shaft sleeve 26 has a first through groove that is open at both ends and slidably connected to the main shaft 22. The secondary shaft sleeve 27 has a second through groove that is open at both ends and slidably connected to the secondary shaft 23. The cross-sections of the first through groove, the second through groove, the main shaft 22, and the secondary shaft 23 are all regular polygons.

[0034] The alternating forward and reverse rotation of the inner pull shaft 5 is mainly achieved through the transmission components. Specifically, the motor 14 on the housing 1 drives the drive gear to rotate. The drive gear meshes with the driven gear ring on the gear cylinder 15 and the rotating drum 2, driving the rotating drum 2 to rotate. In the transmission components on the rotating drum 2, the transmission gear 25 mounted on the main shaft 22 is adapted and connected to the low-speed ratio gear 19 or high-speed ratio gear 20 on the differential shaft 17, thereby transmitting power to the transmission components. An elastic transmission belt 31 is installed on the auxiliary shaft sleeve 27. The synchronous shaft 28 and the inner pull shaft 5 are both connected to the elastic transmission belt 31. When the main shaft 22 rotates, it drives the main shaft sleeve... When the 26 rotates, the large angle sector gear 44 and the small angle sector gear 45 alternately mesh with the synchronous gear 46. Through the transmission of the elastic transmission belt 31, the inner pull shaft 5 alternately obtains power in different directions, thereby realizing alternating forward and reverse rotation. The alternating forward and reverse rotation of the inner pull shaft 5 enables the magnetic filter element 7 installed at its bottom end to change the direction and mode of air flow during the filtration process. The air forms a complex flow path in the magnetic filter element 7, which increases the contact area and contact time between the air and the magnetic filter element 7, thereby improving the filtration efficiency of pollutants such as dust and impurities in the air, making the air entering the central air conditioning system cleaner.

[0035] In the backwash mode, the alternating forward and reverse rotation of the inner pull shaft 5 can drive the magnetic filter element 7 to rotate in different directions, which helps to loosen and shake off the dirt adsorbed on the magnetic filter element 7. Combined with the function of other backwash components, the magnetic filter element 7 can be cleaned more thoroughly, extending the service life of the magnetic filter element 7 and reducing the maintenance cost of the system.

[0036] The reciprocating frequency and stroke of the swing seat 4 also depend on the structural design of the transmission components. The rotation of the main shaft 22 drives the rotation of the main shaft sleeve 26. The large angle sector gear 44 and the small angle sector gear 45 on the main shaft sleeve 26 mesh alternately with the synchronous gear 46 on the secondary shaft sleeve 27. When the large angle sector gear 44 meshes with the synchronous gear 46, the transmission time is longer because the center angle corresponding to the large angle sector gear 44 is larger. During this period, the swing seat 4 reciprocates at a certain frequency and stroke.

[0037] When the small angle sector gear 45 meshes with the synchronous gear 46, the center angle corresponding to the small angle sector gear 45 is smaller, the transmission time is shorter, and the movement frequency and stroke of the swing seat 4 change. In the transmission interruption zone, the motion state of the swing seat 4 will also change accordingly, thereby realizing the cyclic change of the reciprocating movement frequency and movement stroke of the swing seat 4. The cyclic change of the reciprocating movement frequency and movement stroke of the swing seat 4 enables the magnetic filter element 7 to perform filtration and back-cleaning operations in different positions and states. During the filtration process, it can ensure that all parts of the magnetic filter element 7 can fully contact the air and avoid filtration dead corners. During the back-cleaning process, it can effectively clean different parts of the magnetic filter element 7, improving the comprehensiveness and thoroughness of back-cleaning. When driven by the low speed ratio gear 19, the inner pull shaft 5 rotates at a stable low speed, which, together with the reverse rotation of the outer pull shaft 6, forms a micro-swirling flow field on the surface of the magnetic filter element 7, enhancing the inertial collision and interception efficiency of airborne particles, especially significantly improving the adsorption effect of particles from 0.1μm to 1μm.

[0038] When driven by the high-speed gear 20, the inner pull shaft 5 alternates between forward and reverse rotation at high speed, which drives the magnetic filter element 7 to generate a composite motion of axial vibration and circumferential eccentric swing. This motion is superimposed on the radial deformation generated by the magnetic fluid squeezing the eccentric capsule column 9, forming a "three-dimensional cleaning force". This motion mode can cause the pores inside the magnetic filter element 7 to periodically expand and contract. Combined with the magnetic field vibration, it can effectively remove stubborn adhering pollutants and improve cleaning efficiency.

[0039] The secondary shaft 23 drives the vertical lead screw 24 to rotate via a synchronous toothed belt. The torsion spring 30 stores and releases elastic potential energy when the lead screw rotates in both directions, causing the swing seat 4 to reciprocate along the vertical lead screw 24. During the back cleaning station, the high-speed gear 20 increases the speed of the vertical lead screw 24. Combined with the power interruption in the transmission interruption zone, a frequency change of "rapid rise, slow fall, rapid rise" is formed.

[0040] When the large-angle sector gear 44 and small-angle sector gear 45 of the main shaft sleeve 26 mesh with the synchronous gear 46, the torque is transmitted through the regular polygonal cross section of the main shaft sleeve 26, driving the secondary shaft sleeve 27 to rotate the synchronous shaft 28. The synchronous shaft 28 meshes with the horizontal lead screw 29 through the first bevel gear, causing the swing seat 4 to move left and right along the horizontal lead screw 29. Due to the difference in the center angle between the large-angle sector gear 44 and the small-angle sector gear 45, the horizontal movement stroke alternates between "long stroke and short stroke" during the meshing cycle.

[0041] The low-speed, stable reciprocating motion keeps the magnetic filter element 7 in a uniformly stretched state, avoiding filter element deformation caused by long-term pressure in a fixed position. At the same time, small-amplitude vibration prevents particulate matter from accumulating on the surface of the magnetic filter element 7 to form a "filter cake layer" and maintains stable airflow resistance. The high-frequency variable-stroke reciprocating motion, combined with the alternating rotation of the inner pull shaft 5, allows the magnetic filter element 7 to undergo a multi-stage cleaning process of "rapid stretching, slow squeezing, and inertial swinging" during backwashing: rapid stretching, i.e., the short-stroke high-frequency stage, can instantly expand the pores of the magnetic filter element 7 and peel off large contaminants; an outer pull shaft 6 is rotatably sleeved on the inner pull shaft 5, and the outer pull shaft 6 is rotatably mounted on the swinging seat 4. The outer pull shaft 6 and the inner pull shaft 5 rotate in opposite directions on the same axis; a central rotating shaft 41 is rotatably mounted on the swinging seat 4, and a central rotating bevel gear is mounted on the central rotating shaft 41. A second bevel gear is mounted on both the outer pull shaft 6 and the inner pull shaft 5. Both second bevel gears are connected to the central rotating bevel gear and are respectively located on both sides of the central rotating bevel gear.

[0042] Through the transmission connection of the intermediate bevel gear and the second bevel gear, the outer pull shaft 6 and the inner pull shaft 5 are coaxially rotated in opposite directions. In the energy-saving central air conditioning fresh air system, this reverse rotation method can enhance the filtration and back-cleaning effect of the magnetic filter element 7. When the inner pull shaft 5 rotates, the outer pull shaft 6 is driven to rotate in the opposite direction through the transmission of the intermediate bevel gear and the second bevel gear. During the filtration process, the reverse rotation of the outer pull shaft 6 and the inner pull shaft 5 can make the air flow inside the magnetic filter element 7 more complex, thereby improving the filtration efficiency. During the back-cleaning process, this reverse rotation can better cooperate with other components to clean the magnetic filter element 7. Compared with the existing technology, the traditional fresh air system filter components only have a single rotation direction, which cannot form a complex air flow and cleaning effect. The coaxial reverse rotation method of the present invention can effectively solve the problems of low filtration efficiency and incomplete back-cleaning, thereby improving the performance of the entire fresh air system.

[0043] A magnetic filter element 7 is installed at the bottom of the outer pull shaft 6. A ventilation assembly communicating with the magnetic filter element 7 is provided on the casing 1. The magnetic filter element 7 revolves with the rotating drum 2 and cycles through the filtration and backwashing states. A positioning shaft 8 is installed at the bottom of the air duct 3. An eccentric bladder column 9 is installed between the inner pull shaft 5 and the positioning shaft 8. A reciprocating screw 10 that can periodically alternate forward and reverse is rotatably installed on the outer side of the air duct 3. Two symmetrically arranged electromagnetic arc blocks 11 with a reciprocating spacing are connected to the reciprocating screw 10. The magnetic field strength of the electromagnetic arc blocks 11 changes periodically. A transformer cylinder 1 communicating with the inner cavity of the eccentric bladder column 9 is installed at the bottom of the air duct 3. 2. Both the transformer cylinder 12 and the eccentric bladder column 9 are filled with magnetic fluid. The magnetic fluid in the transformer cylinder 12 is driven by the reciprocating screw 10 and reciprocally squeezed into the eccentric bladder column 9. A reciprocating gear 43 is installed on the reciprocating screw 10, and a half-tooth gear 32 is installed at the bottom of the main shaft 22. The half-tooth gear 32 is connected to the reciprocating gear 43. The reciprocating screw 10 is symmetrically provided with a positive thread section and a negative thread section. Two electromagnetic arc blocks 11 are respectively connected to the positive thread section and the negative thread section. A limiting guide groove that is slidably connected to the electromagnetic arc block 11 is fixedly opened on the air duct 3. The central angle corresponding to the electromagnetic arc block 11 is 30°.

[0044] The magnetic fluid comprises the following components: a magnetic agent, a surfactant, and a base liquid. The magnetic agent is second Fe3O4 magnetic microparticles with a size of 8 nm. The surfactant is oleic acid, which coats the surface of the second Fe3O4 magnetic microparticles. The base liquid is silicate oil. When the electromagnetic arc block 11 applies a periodically changing magnetic field, the magnetic fluid generates directional flow and compressive stress due to magnetic action, driving the eccentric capsule column 9 to deform and forcibly compress the magnetic filter element 7, causing the magnetic filter element 7 to deform and discharge the dirt adhering to it. The magnetic fluid in the transformer cylinder 12 is driven by the reciprocating screw 10 and reciprocates and compresses into the eccentric capsule column 9, thereby changing the compressive strength of the eccentric capsule column 9 on the magnetic filter element 7, and thus changing the deformation and self-drainage strength of the magnetic filter element 7. By deforming the eccentric capsule column 9 to forcibly compress the magnetic filter element 7, the adsorbed dirt is more easily removed, ensuring the filtration performance of the magnetic filter element 7 and extending its service life. The compression frequency and direction can be changed by adjusting the rotation of the reciprocating screw 10 to meet the needs of different scenarios.

[0045] When the two electromagnetic arc blocks 11 are energized, they generate a directional attraction force on the magnetic fluid. The reciprocating movement of the two electromagnetic arc blocks 11 promotes the flow of the magnetic fluid, causing it to generate directional flow and compressive stress under the changing magnetic field. This ensures the fluid's circulation and effectively compresses each filtration point of the magnetic filter element 7. The forced compression at each point enhances the removal of contaminants. Simultaneously, when the two electromagnetic arc blocks 11 are energized, the first Fe3O4 magnetic particles in the magnetic filter element 7 generate composite multidimensional vibrations, forming high-frequency micro-eddies. This promotes the removal of residual contaminants, and the reciprocating movement expands the influence range of the magnetic field. The dynamically changing magnetic field allows the magnetic fluid and magnetic filter element 7 to respond quickly, reducing backwashing time and energy consumption. Furthermore, the 30° central angle of the electromagnetic arc blocks 11 optimizes the magnetic field distribution, precisely acting on the magnetic filter element 7 and the magnetic fluid area, avoiding energy waste, improving the flow and backwashing effect of the magnetic fluid, and reducing energy consumption.

[0046] Compared with existing technologies, traditional fresh air systems use simple airflow backflushing and other methods for back cleaning, which is not very effective. However, this invention utilizes the properties of magnetic fluid to perform forced squeezing back cleaning, which can more thoroughly clean the magnetic filter element 7, solve the problem of poor back cleaning effect, ensure the filtration performance of the magnetic filter element 7, and extend the service life of the magnetic filter element 7. The magnetic filter element 7 includes an elastic matrix with multiple composite corrugated units on it. First Fe3O4 magnetic particles coated with oleic acid are uniformly dispersed in the elastic matrix, and the elastic matrix has an elastic skeleton built in.

[0047] The composite corrugated unit is composed of multi-level nested peak-valley corrugations. The corrugation depth of the composite corrugated unit is 1mm, the corrugation spacing is 2mm, and the waveform of the composite corrugated unit is a sine wave. In the non-stretched state, the composite corrugated unit can be folded and compressed along the axis to form a multi-layer dense filter screen with a filtration accuracy of 0.5μm.

[0048] The first Fe3O4 magnetic particles have a particle size of 8nm and account for 15% of the mass. When the electromagnetic arc block 11 applies an alternating magnetic field, the first Fe3O4 magnetic particles generate a composite multidimensional vibration of axial vibration, radial oscillation and circumferential vortex, which drives the formation of high-frequency micro-eddy current inside the magnetic filter element 7, causing residual dirt to detach from the filter pores of the magnetic filter element 7.

[0049] The elastic skeleton is composed of a composite of spiral nickel-titanium shape memory alloy wire and carbon fiber braided layers. The elastic skeleton and composite corrugated unit are conformally fixed, and the elastic matrix is ​​a polyurethane elastomer composite material. The composite corrugated unit can be folded and compressed axially in a non-stretched state to form a multi-layered dense filter screen. Furthermore, the first Fe3O4 magnetic particles generate composite multi-dimensional vibrations under the action of an alternating magnetic field, which can improve the filtration accuracy and backwashing effect of the magnetic filter element 7. In energy-saving central air conditioning fresh air systems, this design can effectively filter tiny particles in the air and promptly clean residual dirt. During the filtration process, the multi-layered dense filter... The filter performs fine filtration of the air. During the backwashing process, the electromagnetic arc block 11 applies an alternating magnetic field, causing the first Fe3O4 magnetic particles to generate a complex multidimensional vibration of axial vibration, radial oscillation, and circumferential vortex. This drives the formation of high-frequency micro-eddies inside the magnetic filter element 7, causing residual dirt to detach from the filter pores of the magnetic filter element 7. Compared with the prior art, the traditional fresh air system filter components have limited filtration accuracy and incomplete backwashing. However, the design of the composite corrugated unit and the first Fe3O4 magnetic particles in this invention can effectively solve these problems and improve the air quality and operating efficiency of the entire fresh air system.

[0050] The ventilation system includes an air inlet duct 33 and an air outlet duct 34 installed at both ends of the chassis 1; the air inlet duct 33 of one air guide system introduces air from the outside, and the air outlet duct 34 sends air into the air conditioner and finally into the room; the air inlet duct 33 of the other air guide system introduces air from the room, and the air outlet duct 34 exhausts the indoor air to the outside after heat exchange.

[0051] A draft pipe 35 is installed at the bottom of the air duct 3. The draft pipe 35 is rotatably connected to the magnetic filter element 7. The positioning shaft 8 is rotatably installed on the draft pipe 35. A set of ventilation holes 36 are opened on the draft pipe 35 at a position corresponding to the inner side of the air duct 3. The draft pipe 35 is fixedly connected to the rotating drum 2 and adapted to the inner cavity of the air inlet pipe 33. An exhaust ring 37 is rotatably installed on the outer pull shaft 6. An air guide channel is fixedly opened inside the outer pull shaft 6. The two ends of the air guide channel are respectively connected to the exhaust ring 37 and the inner cavity of the magnetic filter element 7. A corrugated connecting pipe is installed on the exhaust ring 37. The other end of the corrugated connecting pipe is fixedly connected to the rotating drum 2 and adapted to the inner cavity of the air outlet pipe 34. An ash discharge valve 38 connected to the draft pipe 35 in the reverse cleaning state is installed on the air inlet pipe 33. A reverse cleaning gas inlet pipe 39 connected to the corrugated connecting pipe in the reverse cleaning state is installed on the air outlet pipe 34.

[0052] The ventilation component is designed to enable smooth airflow and back-cleaning operation. In an energy-saving central air conditioning fresh air system, one air guide system introduces outdoor air into the room and delivers it to the interior, while another air guide system exhausts indoor air to the outside. Simultaneously, in back-cleaning mode, the magnetic filter element 7 can be cleaned. The workflow is as follows: In filtration mode, air is introduced through the air inlet pipe 33 and enters the magnetic filter element 7 through the air duct 35. The filtered air is discharged from the air outlet pipe 34 through the air guide channel, exhaust ring 37, and corrugated connecting pipe. In back-cleaning mode, the ash discharge valve 38 is opened, and back-cleaning gas is introduced through the back-cleaning gas inlet pipe 39 to remove dirt from the magnetic filter element 7. Compared with the prior art, the traditional fresh air system ventilation structure has problems such as poor airflow or inconvenient back-cleaning. The ventilation component design of this invention can effectively solve these problems, ensuring the normal operation of the fresh air system and efficient air filtration.

[0053] A reciprocating piston 40 is slidably installed inside the transformer cylinder 12. The reciprocating screw 10 is connected to the reciprocating piston 40 for transmission. A liquid guide channel communicating with the inner cavity of the eccentric bladder column 9 is fixedly opened inside the positioning shaft 8. The liquid guide channel is connected with the inner cavity of the transformer cylinder 12.

[0054] The working principle of this invention is as follows: The energy-saving central air conditioning fresh air system of this invention works in concert through dual air guiding systems. One air guiding system is responsible for introducing outdoor air, filtering it, and then sending it indoors, while the other air guiding system draws indoor air out, processes it, and then discharges it. The specific working principle and process are as follows:

[0055] Filtration status: Outdoor air enters through the air inlet duct 33, passes through the air duct 35 which is fixedly connected to the rotating drum 2, and enters the magnetic filter element 7 inside the air duct 3 through the air vent 36. At this time, the rotating drum 2 drives the air filtration component to revolve to the filtration station. The motor 14 drives the drive gear, which drives the rotating drum 2 and the gear cylinder 15 to rotate through the driven gear ring. The drive gear ring 16 on the gear cylinder 15 meshes with the differential gear 18 on the differential shaft 17, so that the differential shaft 17 of the filtration station drives the transmission component through the low-speed ratio gear 19. The main shaft 22 in the transmission component is connected to the low-speed ratio gear 19 through the transmission gear 25, which drives the main shaft sleeve 26 to rotate. The large angle sector gear 44 meshes with the synchronous gear 46, which drives the synchronous shaft 28 and the horizontal lead screw 29 through the elastic transmission belt 31. This causes the swing seat 4 to reciprocate along the vertical lead screw 24 and the planar lead screw 29 at a low speed and with a stable stroke. At the same time, the inner pull shaft 5 obtains power through the elastic transmission belt 31 to rotate at a stable low speed. It also drives the outer pull shaft 6 to rotate in the opposite direction on the same axis through the intermediate bevel gear and the second bevel gear. The composite corrugated unit on the elastic matrix of the magnetic filter element 7 forms a multi-layer dense filter screen in the non-stretched state. Together with the first Fe3O4 magnetic particles, it performs fine filtration of the air. The first Fe3O4 magnetic particles adsorb particulate matter in the air through magnetic adsorption. The filtration accuracy can reach 0.1μm-1μm. The filtered air passes through the air guide channel, exhaust ring 37 and corrugated connecting pipe inside the outer pull shaft 6, and is sent into the air conditioner cooler from the air outlet pipe 34, and finally enters the room.

[0056] In the reverse cleaning state: when the air filter component rotates with the rotating cylinder 2 to the reverse cleaning station, the driving gear ring 16 of the gear cylinder 15 meshes with the high-speed ratio gear 20 on the differential shaft 17 of the reverse cleaning station, driving the transmission component to rotate at high speed. The main shaft 22 is connected to the high-speed ratio gear 20 through the transmission gear 25, driving the main shaft sleeve 26 to rotate. The small angle sector gear 45 meshes with the synchronous gear 46, causing the inner pull shaft 5 to alternately rotate forward and reverse at high speed. At the same time, the reciprocating frequency and stroke of the swing seat 4 increase, forming a frequency change of "fast rise, slow fall, fast rise" and an alternating horizontal movement of "long stroke, short stroke". Meanwhile, the half-tooth gear 32 at the bottom of the main shaft 22 drives the reciprocating gear 43, causing the reciprocating screw 10 to periodically alternate forward and reverse, driving the two electromagnetic arc blocks 11 to reciprocate within the limit guide groove. The spacing changes back and forth and the magnetic field strength changes periodically. The alternating magnetic field of the electromagnetic arc blocks 11 causes the magnetic flux in the transformer cylinder 12 and the eccentric bladder column 9 to change. The body generates directional flow and compressive stress. The magnetofluid is reciprocated and compressed in the transformer cylinder 12 and eccentric bladder 9 through the transmission of the reciprocating piston 40, driving the eccentric bladder 9 to deform and forcibly compress the magnetic filter element 7, causing it to generate a composite motion of axial vibration, circumferential eccentric swing and radial deformation. At this time, the first Fe3O4 magnetic particles generate a composite multidimensional vibration of axial vibration, radial swing and circumferential vortex under the alternating magnetic field, driving the formation of high-frequency micro eddies inside the magnetic filter element 7, causing residual dirt to be removed from the filter pores. At the same time, the backwash gas inlet pipe 39 introduces backwash gas, which enters the magnetic filter element 7 through the corrugated connecting pipe, exhaust ring 37 and air guide channel, and discharges the detached dirt through the ash discharge valve 38 on the exhaust pipe 35 and the air inlet pipe 33. Through the revolution of the rotating cylinder 2, the magnetic filter element 7 cycles through the switching of the filtration state and the backwash state, realizing the synergistic work of high-efficiency filtration and energy-saving backwash, and improving the overall performance of the fresh air system.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving device for a central air conditioning fresh air system, comprising two air guiding systems, each air guiding system including a casing, characterized in that: The chassis is equipped with a filtration station, a backwashing station, and a rotating drum. Two symmetrically arranged air-filtering components are mounted on the rotating drum. Each air-filtering component includes an air duct mounted on the rotating drum and a transmission component. The transmission component rotates at different speeds at the filtration and backwashing stations. The transmission component is connected to a swinging seat that can reciprocate in both vertical and horizontal directions, and an inner pull shaft that can alternately rotate forward and backward. The reciprocating frequency and stroke of the swinging seat change cyclically. An outer pull shaft is rotatably mounted on the inner pull shaft and is rotatably mounted on the swinging seat. The outer pull shaft rotates coaxially with the inner pull shaft in opposite directions. A magnetic filter element is mounted at the bottom of the outer pull shaft. The chassis has a ventilation assembly connected to the magnetic filter element. The magnetic filter element rotates with the rotating drum and cyclically switches between filtration and backwashing states. The air duct has a positioning shaft installed at its lower part, an eccentric bladder column installed between the inner pull shaft and the positioning shaft, and a reciprocating screw that can periodically alternate forward and reverse rotation installed on the outer side of the air duct. Two symmetrically arranged electromagnetic arc blocks with a reciprocatingly changing spacing are connected to the reciprocating screw. The magnetic field strength of the electromagnetic arc blocks changes periodically. A transformer cylinder connected to the inner cavity of the eccentric bladder column is installed at the bottom of the air duct. Both the transformer cylinder and the eccentric bladder column are filled with magnetic fluid. The magnetic fluid in the transformer cylinder is driven by the reciprocating screw and reciprocally squeezed into the eccentric bladder column. The magnetic filter element includes an elastic matrix with multiple composite corrugated units. First Fe3O4 magnetic particles coated with oleic acid are uniformly dispersed in the elastic matrix. An elastic skeleton is built into the elastic matrix.

2. The energy-saving device for a central air conditioning fresh air system according to claim 1, characterized in that: It also includes a housing, the chassis is fixedly connected to the housing, two motors are installed on the chassis, each of the output shafts of the two motors is equipped with a drive gear, a gear cylinder is rotatably sleeved on the rotating drum, a drive gear ring is installed on the gear cylinder, and a driven gear ring is installed on both the gear cylinder and the rotating drum. The two drive gears are respectively meshed with the two driven gear rings, and a corrugated sealing cover is rotatably installed on the outer pull shaft, the corrugated sealing cover is fixedly connected to the air duct.

3. The energy-saving device for a central air conditioning fresh air system according to claim 2, characterized in that: A differential shaft is rotatably mounted on the chassis at positions corresponding to the filtration station and the backwashing station. Differential gears that mesh with the drive gear ring are mounted on both differential shafts. A low-speed ratio gear is mounted on the differential shaft in the filtration station, and a high-speed ratio gear is mounted on the differential shaft in the backwashing station. Both the low-speed ratio gear and the high-speed ratio gear are connected to the transmission components.

4. The energy-saving device for a central air conditioning fresh air system according to claim 3, characterized in that: The transmission components include a tensioning seat and a bracket mounted on a rotating drum. A main shaft, a secondary shaft, and a vertical lead screw are rotatably mounted on the bracket. Two transmission gears are mounted on the main shaft, respectively adapted to and connected to a low-speed ratio gear and a high-speed ratio gear. A synchronous toothed belt drives the secondary shaft and the vertical lead screw. A main shaft sleeve driven by the main shaft, a secondary shaft sleeve linked to the secondary shaft, a synchronous shaft, and a horizontal lead screw are rotatably mounted on the tensioning seat. A large-angle sector gear and a small-angle sector gear are mounted on the main shaft sleeve. Two symmetrically arranged features are positioned between the large-angle sector gear and the small-angle sector gear on the main shaft sleeve. The transmission interruption zone is set. Two synchronous gears are installed on the secondary shaft sleeve. The two synchronous gears are respectively adapted and connected to the large angle sector gear and the small angle sector gear. First bevel gears are installed on both the synchronous shaft and the horizontal lead screw. The two first bevel gears mesh orthogonally. Torsion springs are provided at the rotational connection between the vertical lead screw and the bracket, the rotational connection between the horizontal lead screw and the tension seat, the rotational connection between the inner pull shaft and the swing seat, and the rotational connection between the reciprocating lead screw and the air duct. An elastic transmission belt is installed on the secondary shaft sleeve. The synchronous shaft and the inner pull shaft are both connected to the elastic transmission belt. The elastic transmission belt is made of elastic rubber.

5. The energy-saving device for a central air conditioning fresh air system according to claim 4, characterized in that: The central angle of the large-angle sector gear is 200°, the central angle of the small-angle sector gear is 120°, and the central angles of the two transmission interruption zones are both 20°. The radii of the large-angle sector gear and the small-angle sector gear are the same, and the radii of the two synchronous gears are the same. The radius of the large-angle sector gear is 6 to 11 times the radius of the synchronous gear. The main shaft sleeve has a first through groove with both ends through and slidingly connected to the main shaft. The secondary shaft sleeve has a second through groove with both ends through and slidingly connected to the secondary shaft. The cross-sections of the first through groove, the second through groove, the main shaft, and the secondary shaft are all regular polygons.

6. The energy-saving device for a central air conditioning fresh air system according to claim 5, characterized in that: A reciprocating gear is installed on the reciprocating screw, and a half-tooth gear is installed at the bottom of the main shaft. The half-tooth gear is connected to the reciprocating gear. A positive thread section and a negative thread section are symmetrically arranged on the reciprocating screw. The two electromagnetic arc blocks are respectively connected to the positive thread section and the negative thread section. A limiting guide groove that is slidably connected to the electromagnetic arc block is fixedly opened on the air duct. The central angle corresponding to the electromagnetic arc block is 30°.

7. The energy-saving device for a central air conditioning fresh air system according to claim 1, characterized in that: The ventilation assembly includes an inlet pipe and an outlet pipe installed at both ends of the chassis. An exhaust pipe is installed at the bottom of the air duct. The exhaust pipe is rotatably connected to the magnetic filter element. The positioning shaft is rotatably installed on the exhaust pipe. A set of ventilation holes is opened on the exhaust pipe at a position corresponding to the inner side of the air duct. The exhaust pipe is fixedly connected to the rotating drum and adapted to connect with the inner cavity of the inlet pipe. An exhaust ring is rotatably installed on the outer pull shaft. An air guide channel is fixedly opened inside the outer pull shaft. The two ends of the air guide channel are respectively connected to the exhaust ring and the inner cavity of the magnetic filter element. A corrugated connecting pipe is installed on the exhaust ring. The other end of the corrugated connecting pipe is fixedly connected to the rotating drum and adapted to connect with the inner cavity of the outlet pipe. An ash discharge valve connected to the exhaust pipe in the reverse cleaning state is installed on the inlet pipe. A reverse cleaning gas inlet pipe connected to the corrugated connecting pipe in the reverse cleaning state is installed on the outlet pipe.

8. The energy-saving device for a central air conditioning fresh air system according to claim 1, characterized in that: A reciprocating piston is slidably installed inside the transformer cylinder. The reciprocating screw is driven by the reciprocating piston. A liquid guide channel communicating with the inner cavity of the eccentric bladder column is fixedly opened inside the positioning shaft. The liquid guide channel is connected to the inner cavity of the transformer cylinder. A central rotating shaft is rotatably installed on the swing seat. A central rotating bevel gear is installed on the central rotating shaft. A second bevel gear is installed on both the outer pull shaft and the inner pull shaft. Both second bevel gears are driven by the central rotating bevel gear. The two second bevel gears are respectively located on both sides of the central rotating bevel gear.

9. The energy-saving device for a central air conditioning fresh air system according to claim 1, characterized in that: The magnetic fluid comprises the following material components: a magnetic agent, a surfactant, and a base liquid. The magnetic agent is second Fe3O4 magnetic microparticles with a size of 2nm-10nm. The surfactant is oleic acid, which coats the surface of the second Fe3O4 magnetic microparticles. The base liquid is silicate oil. When the electromagnetic arc block applies a periodically changing magnetic field, the magnetic fluid generates directional flow and compressive stress due to magnetic action, driving the eccentric capsule column to deform and forcibly compress the magnetic filter element, causing the magnetic filter element to deform and discharge the dirt adhering to it.

10. An energy-saving device for a central air conditioning fresh air system according to claim 1, characterized in that: The composite corrugated unit is composed of multi-level nested peak-valley corrugations. The corrugation depth of the composite corrugated unit is 0.5mm-2mm, the corrugation spacing is 1mm-3mm, and the waveform of the composite corrugated unit is a sine wave. In the non-stretched state, the composite corrugated unit can be folded and compressed along the axial direction to form a multi-layer dense filter screen with a filtration accuracy of 0.1μm-1μm. The particle size of the first Fe3O4 magnetic particles is 5nm-20nm. When the electromagnetic arc block applies an alternating magnetic field, the first Fe3O4 magnetic particles generate a composite multi-dimensional vibration of axial vibration, radial oscillation, and circumferential vortex, driving the formation of high-frequency micro-eddy currents inside the magnetic filter element, which promotes the removal of residual dirt from the filter pores of the magnetic filter element. The elastic skeleton is composed of a spiral nickel-titanium shape memory alloy wire and a carbon fiber braided layer. The elastic skeleton is conformally fixed with the composite corrugated unit. The elastic matrix is ​​a polyurethane elastomer composite material.

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