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

Abstract

The invention relates to the technical field of central air conditioner fresh air systems, and discloses an energy-saving central air conditioner fresh air system energy-saving device which comprises two air guiding systems, each air guiding system comprises a machine box, each machine box is provided with a filtering station, a reverse cleaning station and a rotary drum, and two symmetrically-arranged air filtering components are installed on each rotary drum; the air filtering component comprises an air duct mounted on the rotary drum and a transmission component, the rotating speeds of the transmission component on the filtering station and the reverse cleaning station are different, the transmission component is in transmission connection with a swinging seat capable of reciprocating in the up-down direction and the left-right direction and an inner pull shaft capable of alternately rotating forwards and backwards, and the reciprocating frequency and the moving stroke of the swinging seat are circularly changed. The inner pull shaft is rotationally sleeved with an outer pull shaft. A multi-dimensional cleaning system with the multi-stage nested composite corrugated units, the first Fe3O4 magnetic particles and magnetofluid extrusion is adopted, during filtering, the composite corrugated units are folded to form a multi-layer compact filter screen, and efficient interception of small particles is achieved in combination with the adsorption effect of the first Fe3O4 magnetic particles.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air systems for central air conditioners. More specifically, the present invention relates to an energy-saving device for a fresh air system of an energy-saving central air conditioner. Background Art

[0002] In the prior art, a patent document with the publication number CN117760025A discloses an energy-saving device for a fresh air system of a central air conditioner. When the filter holes are blocked and the permeability becomes low, the above device realizes the automatic cleaning of the surface of the filter strip and the inside of the formed filter holes by the reset of the filter strip deformed under the action of wind force, in cooperation with the piston resetting in the third chute first slowly and then quickly, so as to drive the filter strip to reciprocate and oscillate and rub during the reset process, ensuring the filtering effect and permeability of the filter frame, reducing the operation load of the unit, extending the working life of the unit, and reducing the subsequent operation and maintenance costs. However, the above device has the following technical problems when in use: The prior art mainly relies on the deformation and reset of the filter element under the action of wind force or simple air flow backwashing. This single cleaning method is difficult to cope with the adhesion problem of complex pollutants. Especially for particles and viscous impurities in deep pores, the cleaning effect is limited. Most existing filter elements adopt a flat or simple corrugated structure, which is easy to form a "filter cake layer" during filtration, resulting in an increase in air flow resistance, and it is difficult to achieve efficient sewage discharge through structural deformation during backwashing.

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

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an energy-saving device for a fresh air system of an energy-saving central air conditioner. The present invention adopts a multi-level nested composite corrugated unit plus the first Fe3O4 magnetic particles plus the magnetic fluid extrusion multi-dimensional cleaning system. During filtration, the composite corrugated unit folds to form multiple layers of dense filter meshes, and combined with the adsorption effect of the first Fe3O4 magnetic particles, it realizes the efficient interception of micro-particles.

[0005] To achieve the above object, the present invention provides the following technical solution: An energy-saving device for a fresh air system of an energy-saving central air conditioner, comprising two air guiding systems. A filtering station, a backwashing station and a rotating drum are respectively provided on the chassis. Two symmetrically arranged air filtering components are installed on the rotating drum. The air filtering component includes an air cylinder installed on the rotating drum and a transmission component. The rotational speeds of the transmission component at the filtering station and the backwashing station are different. A swinging seat that can reciprocate in the vertical and horizontal directions and an inner pulling shaft that can alternately rotate forward and backward are drivingly connected to the transmission component. The reciprocating movement frequency and the moving stroke of the swinging seat change cyclically. An outer pulling shaft is rotatably sleeved on the inner pulling shaft. The outer pulling shaft is rotatably installed on the swinging seat. The outer pulling shaft and the inner pulling shaft rotate coaxially and in opposite directions. A magnetic filter element is installed at the bottom end of the outer pulling shaft. A ventilation assembly communicated with the magnetic filter element is provided on the chassis. The magnetic filter element revolves with the rotating drum and cyclically switches between the filtering state and the backwashing state. A positioning shaft is installed at the lower part of the air cylinder. An eccentric bladder column is installed between the inner pulling shaft and the positioning shaft. A reciprocating lead screw that can periodically rotate forward and backward alternately is rotatably installed on the outer side of the air cylinder. Two symmetrically arranged electromagnetic arc blocks with a reciprocally changing distance are drivingly connected to the reciprocating lead screw. The magnetic field intensity of the electromagnetic arc blocks changes periodically. A pressure-changing cylinder communicated with the inner cavity of the eccentric bladder column is installed at the bottom of the air cylinder. Both the pressure-changing cylinder and the eccentric bladder column are filled with magnetic fluid. The magnetic fluid in the pressure-changing cylinder is driven by the reciprocating lead screw and reciprocally extruded into the eccentric bladder column; The magnetic filter element includes an elastic matrix, on which a plurality of composite corrugated units are provided. First Fe3O4 magnetic particles with oleic acid-coated surfaces are evenly dispersed in the elastic matrix. An elastic skeleton is arranged inside the elastic matrix.

[0006] As a preferred technical solution of the present invention, it further includes a housing. The chassis is fixedly connected to the housing. Two motors are installed on the chassis. Driving gears are installed at the output shaft ends of the two motors. A toothed cylinder is rotatably sleeved on the rotating drum. A driving gear ring is installed on the toothed cylinder. Driven gear rings are installed on both the toothed cylinder and the rotating drum. The two driving gears are respectively meshed and connected with the two driven gear rings. A corrugated sealing cover is rotatably installed on the outer pulling shaft. The corrugated sealing cover is fixedly connected to the air cylinder.

[0007] As a preferred technical solution of the present invention, a differential shaft is rotatably installed at a position corresponding to the filtering station and the backwashing station on the chassis. Differential gears meshing with the driving gear ring are installed on both of the two differential shafts. A low-speed ratio gear is installed on the differential shaft at the filtering station. A high-speed ratio gear is installed on the differential shaft at the backwashing station. Both the low-speed ratio gear and the high-speed ratio gear are drivingly connected to the transmission component.

[0008] As a preferred technical solution of the present invention, the transmission component includes a stretching seat and a bracket mounted on the rotating cylinder. A main shaft, a secondary shaft and a vertical lead screw are respectively rotatably mounted on the bracket. Two transmission gears are mounted on the main shaft, and the two transmission gears are respectively adaptively connected to a low-speed ratio gear and a high-speed ratio gear. A synchronous toothed belt is drivingly connected between the secondary shaft and the vertical lead screw. A main shaft sleeve driven by the main shaft, a secondary shaft sleeve linked with the secondary shaft, a synchronous shaft and a horizontal lead screw are respectively rotatably mounted on the stretching seat. A large angular sector gear and a small angular sector gear are respectively mounted on the main shaft sleeve. Two symmetrically arranged transmission interruption areas are provided at the position of the main shaft sleeve between the corresponding large angular sector gear and small angular sector gear. Two synchronous gears are mounted on the secondary shaft sleeve, and the two synchronous gears are respectively adaptively connected to the large angular sector gear and the small angular sector gear. First bevel gears are mounted on both the synchronous shaft and the horizontal lead screw, and the two first bevel gears are orthogonally engaged. Torsion springs are provided at the rotational connection of the vertical lead screw and the bracket, the rotational connection of the horizontal lead screw and the stretching seat, the rotational connection of the inner pull shaft and the swinging seat, and the rotational connection of the reciprocating lead screw and the air cylinder. An elastic transmission belt is drivingly mounted on the secondary shaft sleeve, and both the synchronous shaft and the inner pull shaft are drivingly connected to the elastic transmission belt. The elastic transmission belt is made of elastic rubber material.

[0009] As a preferred technical solution of the present invention, the central angle corresponding to the large angular sector gear is 200°, the central angle corresponding to the small angular sector gear is 120°, the central angles corresponding to the two transmission interruption areas are both 20°, the radii of the large angular sector gear and the small angular sector gear are the same and the radii of the two synchronous gears are the same. The radius of the large angular sector gear is 6 to 11 times the radius of the synchronous gear. A first through groove that penetrates through both ends and is slidably connected to the main shaft is fixedly opened inside the main shaft sleeve. A second through groove that penetrates through both ends and is slidably connected to the secondary shaft is fixedly opened inside the secondary shaft sleeve. 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 technical solution of the present invention, a reciprocating gear is mounted on the reciprocating lead screw, a semi-toothed gear is mounted at the bottom of the main shaft, and the semi-toothed gear is drivingly connected to the reciprocating gear. A positive thread section and a reverse thread section are symmetrically arranged on the reciprocating lead screw, and the two electromagnetic arc blocks are respectively drivingly connected to the positive thread section and the reverse thread section. A limiting guide groove slidably connected to the electromagnetic arc block is fixedly opened on the air cylinder. The central angle corresponding to the electromagnetic arc block is 30°.

[0011] As a preferred technical solution of the present invention, the ventilation assembly includes an air inlet pipe and an air outlet pipe installed at both ends of the chassis. A draft pipe is installed at the bottom of the air cylinder. The draft pipe is rotatably connected to the magnetic filter element. The positioning shaft is rotatably installed on the draft pipe. A set of ventilation holes are provided on the draft pipe corresponding to the inner side of the air cylinder. The draft pipe is fixedly communicated with the rotating cylinder and is adaptively communicated with the inner cavity of the air inlet pipe. An exhaust ring is rotatably installed on the outer pull shaft. A guide air flow channel is fixedly opened inside the outer pull shaft. Both ends of the guide air flow channel are communicated with the inner cavities of the exhaust ring and the magnetic filter element respectively. A corrugated joint pipe is installed on the exhaust ring. The other end of the corrugated joint pipe is fixedly communicated with the rotating cylinder and is adaptively communicated with the inner cavity of the air outlet pipe. A dust discharge valve that is communicated with the draft pipe in the backwashing state is installed on the air inlet pipe. An anti-cleaning gas inlet pipe that is communicated with the corrugated joint pipe in the backwashing state is installed on the air outlet pipe.

[0012] As a preferred technical solution of the present invention, a reciprocating piston is slidably installed in the pressure-changing cylinder. The reciprocating lead screw is in transmission connection with the reciprocating piston. A liquid guide flow channel that is communicated with the inner cavity of the eccentric bladder column is fixedly opened in the positioning shaft. The liquid guide flow channel is communicated with the inner cavity of the pressure-changing cylinder. A middle rotating shaft is rotatably installed on the swinging seat. A middle bevel gear is installed on the middle rotating shaft. Second bevel gears are installed on both the outer pull shaft and the inner pull shaft. Both of the second bevel gears are in transmission connection with the middle bevel gear. The two second bevel gears are respectively arranged on both sides of the middle bevel gear.

[0013] As a preferred technical solution of the present invention, the ferrofluid includes the following material components: magnetic agent, surfactant and base liquid. The magnetic agent is the second Fe3O4 magnetic microparticles. The size of the second Fe3O4 magnetic microparticles is 2nm - 10nm. The surfactant is oleic acid, which is wrapped on 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 ferrofluid generates a directional flow and extrusion stress due to the magnetic effect, driving the eccentric bladder column to deform to forcibly extrude the magnetic filter element, prompting the magnetic filter element to be extruded and deformed and discharge the dirt adhered thereto.

[0014] As a preferred technical solution of the present invention, the composite corrugated unit is composed of multi-stage nested peak-valley corrugations. The corrugation depth of the composite corrugated unit is 0.5 mm - 2 mm, and the corrugation pitch is 1 mm - 3 mm. The waveform of the composite corrugated unit is a sine waveform. In the non-stretched state, the composite corrugated unit can be axially folded and compressed to form a multi-layer dense filter screen, with a filtration accuracy of 0.1 μm - 1 μm. The particle size of the first Fe3O4 magnetic particles is 5 nm - 20 nm. 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 swing, and circumferential vortex, driving the formation of high-frequency micro-vortices inside the magnetic filter element, prompting the residual dirt to detach from the filtration pores of the magnetic filter element. The elastic skeleton is composed of a composite of helical nickel-titanium shape memory alloy wires 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. Aiming at the defects of the existing filter element with a simple structure and relying solely on single wind vibration for backwashing, the present invention adopts a multi-dimensional cleaning system of multi-stage nested composite corrugated units plus first Fe3O4 magnetic particles plus magnetic fluid extrusion. During filtration, the composite corrugated unit folds to form a multi-layer dense filter screen, combined with the adsorption effect of magnetic particles, to achieve efficient interception of micro-particles. During backwashing, the electromagnetic arc block generates an alternating magnetic field, driving the first Fe3O4 magnetic particles to form a composite motion of axial vibration, radial swing, and circumferential vortex. At the same time, the magnetic fluid periodically extrudes the filter element through a reciprocating screw rod to drive an eccentric bladder column, causing the pores of the filter element to expand and contract. Under the dual action, the efficiency of peeling off pollutants in the deep pores is improved. Compared with the traditional single cleaning method of "wind vibration plus friction", the present invention solves the technical bottlenecks of difficult removal of viscous pollutants and deep blockage of the filter element.

[0017] 2. Aiming at the problem in the prior art that filtration and backwashing adopt a fixed rotational speed and cannot balance efficiency and energy consumption, the present invention innovatively designs a differential shaft plus high and low speed ratio gears, enabling the transmission components to operate stably at a low speed during the filtration station and at a high speed and high frequency during the backwashing station. Specifically, during filtration, the low speed ratio gear drives the inner pull shaft to rotate stably, cooperating with the reverse rotation of the outer pull shaft to form a micro-vortex flow field, significantly improving the adsorption efficiency of 0.1 μm - 1 μm grade particles. During backwashing, the high speed ratio gear drives the swinging seat to achieve a variable-frequency reciprocating motion of "fast rising and slow falling", superimposed on the high-speed alternating forward and reverse rotation of the inner pull shaft, forming a three-dimensional cleaning force of "axial vibration, circumferential swinging, and radial extrusion" to completely peel off stubborn pollutants.

[0018] 3. Aiming at the problems that the existing rigid transmission is prone to cause filter element deformation and cleaning dead corners, the present invention adopts a flexible linkage structure of an elastic transmission belt, a torsion spring and a bevel gear set. The main shaft sleeve and the auxiliary shaft sleeve transmit torque through a regular polygon cross-section, and cooperate with the alternating meshing of the large bevel gear and the small bevel gear, so that the swinging seat forms a cyclic motion mode of "long stroke at low speed, short stroke at high speed" in the vertical and horizontal directions. During filtration, the low-speed and stable reciprocating motion avoids local compression deformation of the filter element and maintains stable air flow 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, eliminating the cleaning blind area of the traditional single-direction motion. This design improves the cleaning coverage rate of the filter element surface, reduces mechanical impact, and significantly improves the system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0021] Figure 3 For the present invention Figure 2 The partial enlarged structural diagram at A in;

[0022] Figure 4 It is a schematic sectional structure diagram of the air outlet pipe and the reciprocating lead screw of the present invention;

[0023] Figure 5 For the present invention Figure 4 The partial enlarged structural diagram at B in;

[0024] Figure 6 For the present invention Figure 4 The partial enlarged structural diagram at C in;

[0025] Figure 7 It is a schematic structural diagram of the toothed cylinder and the air cylinder of the present invention;

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

[0027] Figure 9 For the present invention Figure 8 The partial enlarged structural diagram at D in.

[0028] In the figure: 1, chassis; 2, rotating cylinder; 3, air duct; 4, swinging seat; 5, inner pull shaft; 6, outer pull shaft; 7, magnetic filter element; 8, positioning shaft; 9, eccentric bladder column; 10, reciprocating lead screw; 11, electromagnetic arc block; 12, transformer cylinder; 13, housing; 14, motor; 15, gear cylinder; 16, driving gear ring; 17, differential shaft; 18, differential gear; 19, low speed ratio gear; 20, high speed ratio gear; 21, bracket; 22, main shaft; 23, auxiliary shaft; 24, vertical lead screw; 25, transmission gear; 26, main shaft sleeve; 27, auxiliary shaft sleeve; 28, synchronous shaft; 29, horizontal lead screw; 30, torsion spring; 31, elastic transmission belt; 32, semi-tooth gear; 33, air inlet duct; 34, air outlet duct; 35, air guiding duct; 36, ventilation hole; 37, exhaust ring; 38, ash discharge valve; 39, backwashing gas inlet pipe; 40, reciprocating piston; 41, middle rotating shaft; 42, corrugated seal cover; 43, reciprocating gear; 44, large angle fan gear; 45, small angle fan gear; 46, synchronous gear; 47, stretching seat. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 9 shown, the present invention provides an energy-saving device for a fresh air system of an energy-saving central air conditioner, including two air guiding systems. One air guiding system is used for introducing air into the room, and the other air guiding system is used for discharging indoor air outwards; it also includes a housing 13, the chassis 1 is fixedly connected to the housing 13, two motors 14 are installed on the chassis 1, driving gears are installed at the output shaft ends of the two motors 14, a gear cylinder 15 is rotatably sleeved on the rotating cylinder 2, a driving gear ring 16 is installed on the gear cylinder 15, passive gear rings are installed on both the gear cylinder 15 and the rotating cylinder 2, and the two driving gears are respectively meshed and connected with the two passive gear rings. A corrugated seal cover 42 is rotatably installed on the outer pull shaft 6, and the corrugated seal cover 42 is fixedly connected to the air duct 3; by driving the driving gears to rotate through the two motors 14, the driving gears are meshed with the passive gear rings on the gear cylinder 15 and the rotating cylinder 2, thereby driving the rotating cylinder 2 and the gear cylinder 15 to rotate. In the fresh air system of the energy-saving central air conditioner, this transmission structure can stably provide power support for subsequent filtering and backwashing operations.

[0031] A filtering station, a backwashing station, and a rotating drum 2 are respectively provided on a chassis 1. Two symmetrically arranged air filtering components are installed on the rotating drum 2. The air filtering components include an air cylinder 3 and a transmission component installed on the rotating drum 2. The rotational speeds of the transmission component at the filtering station and the backwashing station are different. The design of different rotational speeds of the transmission component at the filtering station and the backwashing station enables the air filtering components to play different roles at different stations. At the filtering station, the low-speed ratio gear 19 makes the rotational speed of the transmission component relatively low, ensuring that the magnetic filter element 7 has sufficient time and stability for air filtration.

[0032] At the backwashing station, the high-speed ratio gear 20 makes the rotational speed of the transmission component relatively high, enabling rapid and effective backwashing operation of the magnetic filter element 7. When the air filtering component rotates with the rotating drum 2 to the filtering station, the low-speed ratio gear 19 cooperates with the transmission component to drive the swinging seat 4 and the inner pull shaft 5 to move at a slower speed and frequency, enabling the magnetic filter element 7 to stably filter air. When it rotates to the backwashing station, the high-speed ratio gear 20 cooperates with the transmission component to increase the movement speed and frequency of the swinging seat 4 and the inner pull shaft 5, providing power for the backwashing operation. Compared with the prior art, the filtering and backwashing operations of the traditional fresh air system adopt the same rotational speed and cannot be optimized according to different working conditions. However, the differential design of the present invention can improve the filtering efficiency and backwashing effect, effectively solve the problems of incomplete filtration and untimely backwashing, extend the service life of the magnetic filter element 7, and reduce the maintenance cost of the system.

[0033] A swing seat 4 that can reciprocate in the vertical and horizontal directions and an inner pull shaft 5 that can alternately rotate forward and backward are drivingly connected to the transmission component. The reciprocating movement frequency and movement stroke of the swing seat 4 change cyclically. On the chassis 1, a differential shaft 17 is rotatably installed at the positions corresponding to the filtration station and the backwashing station. Differential gears 18 meshing with the driving gear ring 16 are installed on both differential shafts 17. A low-speed ratio gear 19 is installed on the differential shaft 17 in the filtration station, and a high-speed ratio gear 20 is installed on the differential shaft 17 in the backwashing station. Both the low-speed ratio gear 19 and the high-speed ratio gear 20 are drivingly connected to the transmission component. The transmission component includes a stretching seat 47 and a bracket 21 installed on the rotating cylinder 2. A main shaft 22, a secondary shaft 23, and a vertical lead screw 24 are rotatably installed on the bracket 21 respectively. Two transmission gears 25 are installed on the main shaft 22, and the two transmission gears 25 are respectively adapted to be connected with the low-speed ratio gear 19 and the high-speed ratio gear 20. A synchronous toothed belt is drivingly connected between the secondary shaft 23 and the vertical lead screw 24. A main shaft sleeve 26 driven by the main shaft 22, a secondary shaft sleeve 27 linked with the secondary shaft 23, a synchronous shaft 28, and a horizontal lead screw 29 are rotatably installed on the stretching seat 47 respectively. A large angle sector gear 44 and a small angle sector gear 45 are installed on the main shaft sleeve 26 respectively. Two symmetrically arranged transmission interruption zones are arranged at the position of the main shaft sleeve 26 corresponding to between the large angle sector gear 44 and the small angle sector gear 45. Two synchronous gears 46 are installed on the secondary shaft sleeve 27, and the two synchronous gears 46 are respectively adapted to be connected with the large angle sector gear 44 and the small angle sector gear 45. First bevel gears are installed on both the synchronous shaft 28 and the horizontal lead screw 29, and the two first bevel gears are orthogonally meshed. Torsion springs 30 are arranged at the rotational connection positions of the vertical lead screw 24 and the bracket 21, the horizontal lead screw 29 and the stretching seat 47, the inner pull shaft 5 and the swing seat 4, and the reciprocating lead screw 10 and the air cylinder 3. An elastic transmission belt 31 is drivingly installed on the secondary shaft sleeve 27. Both the synchronous shaft 28 and the inner pull shaft 5 are drivingly connected to the elastic transmission belt 31, and the elastic transmission belt 31 is made of elastic rubber material. The central angle corresponding to the large angle sector gear 44 is 200°, the central angle corresponding to the small angle sector gear 45 is 120°, the central angles corresponding to 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, and the radius of the large angle sector gear 44 is 10 times the radius of the synchronous gear 46. A first through groove that penetrates through both ends and is slidably connected to the main shaft 22 is fixedly opened inside the main shaft sleeve 26, and a second through groove that penetrates through both ends and is slidably connected to the secondary shaft 23 is fixedly opened inside the secondary shaft sleeve 27. 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 transmission components. Specifically, the motor 14 on the chassis 1 drives the active gear to rotate. The active gear meshes with the passive gear rings on the gear cylinder 15 and the rotating cylinder 2, driving the rotating cylinder 2 to rotate. Among the transmission components on the rotating cylinder 2, the transmission gear 25 installed on the main shaft 22 is adaptively connected to the low-speed ratio gear 19 or the 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 secondary shaft sleeve 27 in a transmission manner. The synchronization shaft 28 and the inner pull shaft 5 are both connected to the elastic transmission belt 31 in a transmission manner. When the main shaft 22 rotates to drive the main shaft sleeve 26 to rotate, the large angular sector gear 44 and the small angular sector gear 45 alternately mesh with the synchronization gear 46. Through the transmission of the elastic transmission belt 31, the inner pull shaft 5 alternately obtains power in different directions, thereby achieving 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 air flow direction and mode during the filtering process. The air forms a complex flow path inside the magnetic filter element 7, increasing the contact area and contact time between the air and the magnetic filter element 7, thereby improving the filtering efficiency of pollutants such as dust and impurities in the air and making the air entering the central air conditioner cleaner.

[0035] In the anti-cleaning state, 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 functions of other anti-cleaning components, the magnetic filter element 7 can be cleaned more thoroughly, the service life of the magnetic filter element 7 can be extended, and the maintenance cost of the system can be reduced.

[0036] The reciprocating movement frequency and movement stroke of the swinging seat 4 also change cyclically depending 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 angular sector gear 44 and the small angular sector gear 45 on the main shaft sleeve 26 alternately mesh with the synchronization gear 46 on the secondary shaft sleeve 27. When the large angular sector gear 44 meshes with the synchronization gear 46, since the central angle corresponding to the large angular sector gear 44 is larger and the transmission time is longer, the swinging seat 4 reciprocates at a certain frequency and stroke during this period.

[0037] When the small-angle sector gear 45 meshes with the synchronous gear 46, the corresponding central angle of the small-angle sector gear 45 is smaller, the transmission time is shorter, the movement frequency and stroke of the swinging seat 4 change. In the transmission interruption area, the movement state of the swinging seat 4 will also change accordingly, thus realizing the cyclic change of the reciprocating movement frequency and movement stroke of the swinging seat 4. The cyclic change of the reciprocating movement frequency and movement stroke of the swinging seat 4 enables the magnetic filter element 7 to perform filtering and backwashing operations in different positions and states. During the filtering process, it can ensure that all parts of the magnetic filter element 7 can fully contact with the air, avoiding filtering dead angles; during the backwashing process, it can effectively clean different parts of the magnetic filter element 7, improving the comprehensiveness and thoroughness of backwashing. When driven by the low-speed ratio gear 19, the inner pull shaft 5 rotates at a stable low speed, cooperating with the reverse rotation of the outer pull shaft 6, forming a micro-vortex 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 on particles in the range of 0.1 μm to 1 μm.

[0038] When driven by the high-speed ratio gear 20, the inner pull shaft 5 rotates forward and backward at high speed alternately, driving the magnetic filter element 7 to generate a composite motion of axial vibration and circumferential eccentric swinging, superimposing the radial deformation generated by the magnetic fluid squeezing the eccentric bladder column 9, forming a "three-dimensional stereo cleaning force"; this motion mode can cause the internal pores of the magnetic filter element 7 to expand and contract periodically, combined with magnetic field vibration, effectively peeling off stubbornly adhered pollutants and improving the cleaning efficiency.

[0039] The secondary shaft 23 drives the vertical lead screw 24 to rotate through a synchronous toothed belt. The torsion spring 30 stores and releases elastic potential energy when the lead screw rotates forward and backward, enabling the swinging seat 4 to perform reciprocating motion along the vertical lead screw 24. During the backwashing station, the high-speed ratio gear 20 increases the rotation speed of the vertical lead screw 24, combined with the power intermittence in the transmission interruption area, forming a frequency change of "fast rise, slow fall, fast rise".

[0040] When the large-angle sector gear 44 and the small-angle sector gear 45 of the main shaft sleeve 26 mesh with the synchronous gear 46, torque is transmitted through the regular polygon cross-section of the main shaft sleeve 26, driving the secondary shaft sleeve 27 to drive the synchronous shaft 28 to rotate. The synchronous shaft 28 meshes with the horizontal lead screw 29 through the first bevel gear, enabling the swinging seat 4 to move left and right along the horizontal lead screw 29. Due to the central angle difference between the large-angle sector gear 44 and the small-angle sector gear 45, the horizontal movement stroke shows an alternating change of "long stroke, short stroke" within the meshing cycle.

[0041] The reciprocating motion with a low speed and stable stroke keeps the magnetic filter element 7 in a uniformly stretched state, avoiding the deformation of the filter element caused by long-term pressure at the fixed position. At the same time, small vibrations are used to prevent particulate matter from accumulating on the surface of the magnetic filter element 7 to form a "filter cake layer", maintaining a stable air flow resistance; the reciprocating motion with a high frequency and variable stroke is combined with the alternating rotation of the inner pull shaft 5, enabling the magnetic filter element 7 to experience multi-stage cleaning of "rapid stretching, slow extrusion, and inertial shaking" during the backwashing process: 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 installed on the shaking seat 4. The outer pull shaft 6 and the inner pull shaft 5 rotate coaxially and in opposite directions; a middle rotating shaft 41 is rotatably installed on the shaking seat 4, a middle bevel gear is installed on the middle rotating shaft 41, and second bevel gears are installed on both the outer pull shaft 6 and the inner pull shaft 5. Both second bevel gears are in transmission connection with the middle bevel gear, and the two second bevel gears are respectively arranged on both sides of the middle bevel gear.

[0042] Through the transmission connection between the middle bevel gear and the second bevel gears, the coaxial reverse rotation of the outer pull shaft 6 and the inner pull shaft 5 is achieved. In the fresh air system of an energy-saving central air conditioner, this reverse rotation method can enhance the filtering and backwashing effects of the magnetic filter element 7. When the inner pull shaft 5 rotates, the transmission of the middle bevel gear and the second bevel gears drives the outer pull shaft 6 to rotate in the opposite direction. During the filtering process, the reversely rotating outer pull shaft 6 and inner pull shaft 5 can make the air flow inside the magnetic filter element 7 more complex, improving the filtering efficiency. During the backwashing process, this reverse rotation can better cooperate with other components to clean the magnetic filter element 7. Compared with the prior art, the filtering components of traditional fresh air systems have only a single rotation direction and cannot form a complex air flow and cleaning effect. However, the coaxial reverse rotation method of the present invention can effectively solve the problems of low filtering efficiency and incomplete backwashing, improving the performance of the entire fresh air system.

[0043] A magnetic filter element 7 is installed at the bottom end of the outer pull shaft 6, and a ventilation assembly communicating with the magnetic filter element 7 is provided on the chassis 1; the magnetic filter element 7 revolves with the rotating cylinder 2 and cyclically switches between the filtering state and the backwashing state. A positioning shaft 8 is installed at the lower part of the air cylinder 3, an eccentric bladder column 9 is installed between the inner pull shaft 5 and the positioning shaft 8, a reciprocating lead screw 10 that can periodically rotate forward and reverse alternately is rotatably installed on the outside of the air cylinder 3, and two symmetrically arranged and electromagnetically arc-shaped blocks 11 with a reciprocally changing spacing are drivingly connected to the reciprocating lead screw 10. The magnetic field intensity of the electromagnetically arc-shaped blocks 11 changes periodically. A pressure-changing cylinder 12 communicating with the inner cavity of the eccentric bladder column 9 is installed at the bottom of the air cylinder 3. Both the pressure-changing cylinder 12 and the eccentric bladder column 9 are filled with magnetic fluid. The magnetic fluid in the pressure-changing cylinder 12 is driven by the reciprocating lead screw 10 and reciprocally extruded into the eccentric bladder column 9; a reciprocating gear 43 is installed on the reciprocating lead screw 10, a semi-toothed gear 32 is installed at the bottom of the main shaft 22, the semi-toothed gear 32 is drivingly connected to the reciprocating gear 43, a positive thread section and a reverse thread section are symmetrically arranged on the reciprocating lead screw 10, and the two electromagnetically arc-shaped blocks 11 are respectively drivingly connected to the positive thread section and the reverse thread section. A limiting guide groove for slidably connecting with the electromagnetically arc-shaped blocks 11 is fixedly opened on the air cylinder 3, and the central angle corresponding to the electromagnetically arc-shaped blocks 11 is 30°.

[0044] The magnetic fluid includes the following material components: a magnetic agent, a surfactant, and a base liquid. The magnetic agent is the second Fe3O4 magnetic microparticle, the size of the second Fe3O4 magnetic microparticle is 8 nm, the surfactant is oleic acid, which is wrapped on the surface of the second Fe3O4 magnetic microparticle, and the base liquid is silicate oil. When the electromagnetically arc-shaped blocks 11 apply a periodically changing magnetic field, the magnetic fluid generates a directional flow and extrusion stress due to the magnetic effect, driving the eccentric bladder column 9 to deform to forcibly extrude the magnetic filter element 7, prompting the magnetic filter element 7 to be extruded and deformed and discharging the dirt adhered thereto; the magnetic fluid in the pressure-changing cylinder 12 is driven by the reciprocating lead screw 10 and reciprocally extruded into the eccentric bladder column 9, and then the extrusion strength of the eccentric bladder column 9 on the magnetic filter element 7 is reciprocally changed, and then the deformation and self-cleaning strength of the magnetic filter element 7 are changed. By deforming the eccentric bladder column 9 to forcibly extrude the magnetic filter element 7, the adsorbed dirt is more easily separated, ensuring the filtering performance of the magnetic filter element 7 and prolonging its service life. By adjusting the rotation of the reciprocating lead screw 10 to change the extrusion frequency and direction, different scenario requirements can be met.

[0045] When the two electromagnetic arc blocks 11 are energized, a directional suction force is generated on the magnetorheological fluid. The reciprocating movement of the two electromagnetic arc blocks 11 can promote the flow of the magnetorheological fluid, causing the magnetorheological fluid to generate directional flow and extrusion stress under a changing magnetic field, ensuring its circulation and effectively extruding each filtration point of the magnetic filter element 7 in a cyclic manner. Through the cyclic forced extrusion of each point, the detachment of dirt can be strengthened. At the same time, when the two electromagnetic arc blocks 11 are energized, the first Fe3O4 magnetic particles in the magnetic filter element 7 generate a composite multi-dimensional vibration to form a high-frequency micro-vortex, promoting the detachment of residual dirt, and the reciprocating movement expands the influence range of the magnetic field. The dynamically changing magnetic field enables the magnetorheological fluid and the magnetic filter element 7 to respond quickly, reducing the backwashing time and energy consumption. The setting of the 30° central angle of the electromagnetic arc block 11 optimizes the magnetic field distribution, precisely acts on the magnetic filter element 7 and the magnetorheological fluid area, avoids energy waste, improves the flow of the magnetorheological fluid and the backwashing effect, and reduces energy consumption.

[0046] Compared with the prior art, the traditional fresh air system uses simple methods such as air flow backwashing for backwashing, with poor effects. However, the present invention uses the characteristics of the magnetorheological fluid for forced extrusion backwashing, which can clean the magnetic filter element 7 more thoroughly, solves the problem of poor backwashing effect, ensures the filtering performance of the magnetic filter element 7, and extends the service life of the magnetic filter element 7. The magnetic filter element 7 includes an elastic matrix, on which a plurality of composite corrugated units are provided. The elastic matrix is evenly dispersed with first Fe3O4 magnetic particles coated with oleic acid on the surface, and an elastic framework is disposed inside the elastic matrix.

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

[0048] The particle size of the first Fe3O4 magnetic particles is 8 nm, and the mass ratio of the first Fe3O4 magnetic particles is 15%. When the electromagnetic arc block 11 applies an alternating magnetic field, the first Fe3O4 magnetic particles generate a composite multi-dimensional vibration of axial vibration, radial swing, and circumferential vortex, driving the formation of a high-frequency micro-vortex inside the magnetic filter element 7, promoting the detachment of residual dirt from the filtration pores of the magnetic filter element 7.

[0049] The elastic framework is composed of a helical nickel-titanium shape memory alloy wire and a carbon fiber braided layer, and the elastic framework is conformally fixed to the composite corrugated unit. The elastic matrix is a polyurethane elastomer composite material; the composite corrugated unit can be axially folded and compressed to form a multi-layer dense filter screen in the non-stretched state, and 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 the fresh air system of an energy-saving central air conditioner, this design can effectively filter tiny particles in the air and clean the residual dirt in a timely manner. During the filtration process, the multi-layer dense filter screen filters the air finely. During the backwashing process, the electromagnetic arc block 11 applies an alternating magnetic field, and the first Fe3O4 magnetic particles generate composite multi-dimensional vibrations of axial vibration, radial swing and circumferential vortex, driving the formation of high-frequency micro-vortices inside the magnetic filter element 7, prompting the residual dirt to break away from the filtration pores of the magnetic filter element 7. Compared with the prior art, the filtration accuracy of the traditional fresh air system filter component is limited and the backwashing is not thorough. The design of the composite corrugated unit and the first Fe3O4 magnetic particles of the present invention can effectively solve these problems and improve the air quality and operating efficiency of the entire fresh air system.

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

[0051] A draft tube 35 is installed at the bottom of the air duct 3. The draft tube 35 is rotatably connected to the magnetic filter element 7. The positioning shaft 8 is rotatably installed on the draft tube 35. A set of ventilation holes 36 are opened on the draft tube 35 corresponding to the inner side of the air duct 3. The draft tube 35 is fixedly communicated with the rotating cylinder 2 and is adaptively communicated with the inner cavity of the air inlet pipe 33. An exhaust ring 37 is rotatably installed on the outer pull shaft 6. A guide air flow passage is fixedly opened inside the outer pull shaft 6. The two ends of the guide air flow passage are respectively communicated with 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 communicated with the rotating cylinder 2 and is adaptively communicated with the inner cavity of the air outlet pipe 34. A dust discharge valve 38 communicated with the draft tube 35 in the backwashing state is installed on the air inlet pipe 33, and an anti-cleaning gas inlet pipe 39 communicated with the corrugated connecting pipe in the backwashing state is installed on the air outlet pipe 34.

[0052] The design of the ventilation component can achieve smooth air circulation and anti-cleaning operation. In the fresh air system of an energy-saving central air conditioner, one air guiding system introduces outdoor air and sends it into the room, and the other air guiding system discharges indoor air outdoors. At the same time, the magnetic filter element 7 can be cleaned in the anti-cleaning state. The working process is as follows: In the filtering state, the air inlet pipe 33 introduces air, enters the magnetic filter element 7 through the air guiding pipe 35, and the filtered air is discharged from the air outlet pipe 34 through the air guiding flow channel, the exhaust ring 37 and the corrugated connecting pipe. In the anti-cleaning state, the ash discharge valve 38 is opened, and the anti-cleaning gas inlet pipe 39 introduces anti-cleaning gas to discharge the dirt on the magnetic filter element 7. Compared with the prior art, the ventilation structure of the traditional fresh air system has problems such as poor air circulation or inconvenient anti-cleaning, while the design of the ventilation component of the present invention can effectively solve these problems, ensuring the normal operation of the fresh air system and the efficient filtration of air.

[0053] A reciprocating piston 40 is slidably installed in the pressure-changing cylinder 12. The reciprocating lead screw 10 is in transmission connection with the reciprocating piston 40. A liquid guiding flow channel communicating with the inner cavity of the eccentric bladder column 9 is fixedly arranged in the positioning shaft 8, and the liquid guiding flow channel communicates with the inner cavity of the pressure-changing cylinder 12.

[0054] The working principle of the present invention is as follows: The energy-saving device of the fresh air system of the energy-saving central air conditioner of the present invention works in cooperation through a double air guiding system. One air guiding system is responsible for introducing outdoor air, filtering it and sending it into the room, and the other air guiding system leads out indoor air, processes it and discharges it. The specific working principle and process are as follows:

[0055] Filtering state: Outdoor air enters through the air inlet pipe 33, passes through the air guiding pipe 35 fixedly connected to the rotating drum 2, and enters the magnetic filter element 7 in the air cylinder 3 through the ventilation holes 36. At this time, the rotating drum 2 drives the air filtering component to revolve to the filtering station. The motor 14 drives the driving gear, and drives the rotating drum 2 and the gear cylinder 15 to rotate through the driven gear ring. The driving 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 at the filtering 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, driving the main shaft sleeve 26 to rotate. The large-angle fan gear 44 meshes with the synchronous gear 46, and drives the synchronous shaft 28 and the horizontal lead screw 29 through the elastic transmission belt 31, so that the swinging seat 4 makes a reciprocating movement with a low speed and a stable stroke along the vertical lead screw 24 and the horizontal lead screw 29. At the same time, the inner pull shaft 5 obtains power through the elastic transmission belt 31 to rotate stably at a low speed, and drives the outer pull shaft 6 to rotate coaxially and in the opposite direction 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, and cooperates with the first Fe3O4 magnetic particles to finely filter the air. The first Fe3O4 magnetic particles magnetically adsorb the particulate matter in the air, and the filtering accuracy can reach 0.1μm - 1μm. The filtered air enters the air conditioner cooler through the air guide flow channel inside the outer pull shaft 6, the exhaust ring 37 and the corrugated connecting pipe, and finally enters the room;

[0056] Anti - cleaning state: When the air - filtering component rotates to the anti - cleaning station with the rotating cylinder 2, the driving gear ring 16 of the gear cylinder 15 meshes with the high - speed ratio gear 20 on the differential shaft 17 at the anti - cleaning station, driving the transmission component to run 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 rotate forward and backward alternately at high speed. At the same time, the reciprocating movement frequency and stroke of the swinging seat 4 are accelerated, forming a frequency change of "fast rising, slow falling, fast rising" and a horizontal movement alternating between "long stroke, short stroke". Meanwhile, the semi - tooth gear 32 at the bottom of the main shaft 22 drives the reciprocating gear 43, causing the reciprocating lead screw 10 to rotate forward and backward periodically and alternately, driving the two electromagnetic arc blocks 11 to reciprocate in the limit guide groove, with the distance changing reciprocally and the magnetic field intensity changing periodically. The alternating magnetic field of the electromagnetic arc blocks 11 causes the magnetorheological fluid in the pressure - changing cylinder 12 and the eccentric bladder column 9 to generate a directional flow and extrusion stress. The magnetorheological fluid reciprocally extrudes in the pressure - changing cylinder 12 and the eccentric bladder column 9 through the transmission of the reciprocating piston 40, driving the eccentric bladder column 9 to deform, and forcibly extruding the magnetic filter element 7, causing it to produce a composite movement of axial vibration, circumferential eccentric swing, and radial deformation. At this time, the first Fe3O4 magnetic particles generate a composite multi - dimensional vibration of axial vibration, radial swing, and circumferential vortex under the alternating magnetic field, driving the formation of high - frequency micro - eddy currents inside the magnetic filter element 7, prompting the residual dirt to break away from the filter pores. At the same time, the anti - cleaning gas inlet pipe 39 introduces anti - cleaning gas, which enters the magnetic filter element 7 through the corrugated connecting pipe, the exhaust air ring 37, and the air guide channel, and discharges the peeled dirt through the ash - discharging valve 38 on the air - discharging pipe 35 and the air inlet pipe 33. Through the revolution of the rotating cylinder 2, the magnetic filter element 7 cyclically switches between the filtering state and the anti - cleaning state, realizing the collaborative work of efficient filtration and energy - saving anti - cleaning, and improving the overall performance of the fresh - air system.

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

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

Claims

1. An energy-saving device for the fresh air system of an energy-saving central air conditioner, comprising two air guiding systems, and the air guiding system includes a chassis, characterized in that: The chassis is respectively provided with a filtering station, a backwashing station and a rotating drum. Two symmetrically arranged air filtering components are installed on the rotating drum. The air filtering component includes an air cylinder and a transmission component installed on the rotating drum. The rotational speeds of the transmission component at the filtering station and the backwashing station are different. 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 drivingly connected to the transmission component. The reciprocating movement frequency and the movement stroke of the swinging seat change cyclically. An outer pull shaft is rotatably sleeved on the inner pull shaft. The outer pull shaft is rotatably installed on the swinging seat. The outer pull shaft and the inner pull shaft rotate coaxially in opposite directions. A magnetic filter element is installed at the bottom end of the outer pull shaft. A ventilation assembly communicated with the magnetic filter element is provided on the chassis. The magnetic filter element revolves with the rotating drum and cyclically switches between the filtering state and the backwashing state. A positioning shaft is installed at the lower part of the air cylinder. An eccentric bladder column is installed between the inner pull shaft and the positioning shaft. A reciprocating lead screw that can periodically rotate forward and backward alternately is rotatably installed on the outer side of the air cylinder. Two symmetrically arranged electromagnetic arc blocks with a reciprocally changing spacing are drivingly connected to the reciprocating lead screw. The magnetic field intensity of the electromagnetic arc blocks changes periodically. A pressure-changing cylinder communicated with the inner cavity of the eccentric bladder column is installed at the bottom of the air cylinder. Both the pressure-changing cylinder and the eccentric bladder column are filled with magnetic fluid. The magnetic fluid in the pressure-changing cylinder is driven by the reciprocating lead screw and reciprocally extruded into the eccentric bladder column; the magnetic filter element includes an elastic matrix. A plurality of composite corrugated units are provided on the elastic matrix. First Fe3O4 magnetic particles with oleic acid-coated surfaces are uniformly dispersed in the elastic matrix. An elastic skeleton is arranged inside the elastic matrix.

2. The energy-saving device for the fresh air system of an energy-saving central air conditioner according to claim 1, wherein: It further includes a housing. The chassis is fixedly connected to the housing. Two motors are installed on the chassis. Driving gears are installed at the output shaft ends of the two motors. A toothed cylinder is rotatably sleeved on the rotating drum. A driving gear ring is installed on the toothed cylinder. Driven gear rings are installed on both the toothed cylinder and the rotating drum. The two driving gears are respectively meshed and connected to the two driven gear rings. A corrugated sealing cover is rotatably installed on the outer pull shaft. The corrugated sealing cover is fixedly connected to the air cylinder.

3. The energy-saving device for the fresh air system of an energy-saving central air conditioner according to claim 2, characterized in that: A differential shaft is rotatably installed at a position corresponding to the filtering station and the backwashing station on the chassis. Differential gears meshed with the driving gear ring are installed on both the two differential shafts. A low-speed ratio gear is installed on the differential shaft at the filtering station. A high-speed ratio gear is installed on the differential shaft at the backwashing station. Both the low-speed ratio gear and the high-speed ratio gear are drivingly connected to the transmission component.

4. The energy-saving device for the fresh air system of an energy-saving central air conditioner according to claim 3, characterized in that: The transmission component includes a stretching seat and a bracket mounted on the rotating cylinder. A main shaft, a sub-shaft, and a vertical lead screw are respectively rotatably mounted on the bracket. Two transmission gears are mounted on the main shaft, and the two transmission gears are respectively connected in a mating manner with a low-speed ratio gear and a high-speed ratio gear. A synchronous toothed belt is connected in a transmission manner between the sub-shaft and the vertical lead screw. A main shaft sleeve driven by the main shaft, a sub-shaft sleeve linked with the sub-shaft, a synchronous shaft, and a horizontal lead screw are respectively rotatably mounted on the stretching seat. A large angular sector gear and a small angular sector gear are respectively mounted on the main shaft sleeve. Two symmetrically arranged transmission interruption areas are arranged at the position of the main shaft sleeve corresponding to the large angular sector gear and the small angular sector gear. Two synchronous gears are mounted on the sub-shaft sleeve, and the two synchronous gears are respectively connected in a mating manner with the large angular sector gear and the small angular sector gear. First bevel gears are mounted on both the synchronous shaft and the horizontal lead screw, and the two first bevel gears are orthogonally meshed. Torsion springs are arranged at the rotational connection positions of the vertical lead screw and the bracket, the horizontal lead screw and the stretching seat, the inner pull shaft and the swinging seat, and the reciprocating lead screw and the air cylinder. An elastic transmission belt is connected in a transmission manner on the sub-shaft sleeve, and the synchronous shaft and the inner pull shaft are both connected in a transmission manner with the elastic transmission belt. The elastic transmission belt is made of elastic rubber material.

5. The energy-saving device for the fresh air system of an energy-saving central air conditioner according to claim 4, characterized in that: The central angle corresponding to the large angular sector gear is 200°, the central angle corresponding to the small angular sector gear is 120°, the central angles corresponding to the two transmission interruption areas are both 20°, the radii of the large angular sector gear and the small angular sector gear are the same and the radii of the two synchronous gears are the same. The radius of the large angular sector gear is 6 to 11 times the radius of the synchronous gear. A first through groove that penetrates through both ends and is slidably connected with the main shaft is fixedly opened inside the main shaft sleeve. A second through groove that penetrates through both ends and is slidably connected with the sub-shaft is fixedly opened inside the sub-shaft sleeve. The cross-sections of the first through groove, the second through groove, the main shaft, and the sub-shaft are all regular polygons.

6. The energy-saving device of the fresh air system of an energy-saving central air conditioner according to claim 5, characterized in that: A reciprocating gear is mounted on the reciprocating lead screw, and a semi-toothed gear is mounted at the bottom of the main shaft. The semi-toothed gear is connected in a transmission manner with the reciprocating gear. A positive thread section and a reverse thread section are symmetrically arranged on the reciprocating lead screw. The two electromagnetic arc blocks are respectively connected in a transmission manner with the positive thread section and the reverse thread section. A limit guide groove that is slidably connected with the electromagnetic arc block is fixedly opened on the air cylinder. The central angle corresponding to the electromagnetic arc block is 30°.

7. An energy-saving device for the fresh air system of an energy-saving central air conditioner according to claim 1, characterized in that: The ventilation component includes an air inlet pipe and an air outlet pipe installed at both ends of the chassis. A draft pipe is installed at the bottom of the air cylinder. The draft pipe is rotatably connected to the magnetic filter element. The positioning shaft is rotatably installed on the draft pipe. A set of ventilation holes are provided on the draft pipe corresponding to the inner side of the air cylinder. The draft pipe is fixedly communicated with the rotating cylinder and is adapted to be communicated with the inner cavity of the air inlet pipe. An exhaust ring is rotatably installed on the outer pull shaft. A guide air flow channel is fixedly opened inside the outer pull shaft. Both ends of the guide air flow channel are communicated with the inner cavities of the exhaust ring and the magnetic filter element respectively. A corrugated connecting pipe is installed on the exhaust ring. The other end of the corrugated connecting pipe is fixedly communicated with the rotating cylinder and is adapted to be communicated with the inner cavity of the air outlet pipe. A dust discharge valve that is communicated with the draft pipe in the backwashing state is installed on the air inlet pipe. An anti-cleaning gas inlet pipe that is communicated with the corrugated connecting pipe in the backwashing state is installed on the air outlet pipe.

8. An energy-saving device for the fresh air system of an energy-saving central air conditioner according to claim 1, characterized in that: A reciprocating piston is slidably installed inside the pressure-changing cylinder. The reciprocating lead screw is in transmission connection with the reciprocating piston. A liquid guide flow channel that is communicated with the inner cavity of the eccentric capsule column is fixedly opened inside the positioning shaft. The liquid guide flow channel is communicated with the inner cavity of the pressure-changing cylinder. A middle rotating shaft is rotatably installed on the swinging seat. A middle bevel gear is installed on the middle rotating shaft. Second bevel gears are installed on both the outer pull shaft and the inner pull shaft. Both of the second bevel gears are in transmission connection with the middle bevel gear. The two second bevel gears are respectively arranged on both sides of the middle bevel gear.

9. An energy-saving device for the fresh air system of an energy-saving central air conditioner according to claim 1, characterized in that: The magnetic fluid includes the following material components: a magnetic agent, a surfactant, and a base liquid. The magnetic agent is second Fe3O4 magnetic microparticles. The size of the second Fe3O4 magnetic microparticles is 2 nm - 10 nm. The surfactant is oleic acid, which is wrapped on 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 a directional flow and extrusion stress due to the magnetic effect, driving the eccentric capsule column to deform to forcibly extrude the magnetic filter element, prompting the magnetic filter element to be extruded and deformed and discharge the dirt adhered thereto.

10. The energy-saving device of the fresh air system of an energy-saving central air conditioner according to claim 1, characterized in that: The composite corrugated unit is composed of multi-stage nested peak-valley corrugations. The corrugation depth of the composite corrugated unit is 0.5 mm - 2 mm, and the corrugation spacing is 1 mm - 3 mm. The waveform of the composite corrugated unit is a sine waveform. In the non-stretched state, the composite corrugated unit can be axially folded and compressed to form a multi-layer dense filter screen, and the filtration accuracy is 0.1 μm - 1 μm. The particle size of the first Fe3O4 magnetic microparticles is 5 nm - 20 nm. When the electromagnetic arc block applies an alternating magnetic field, the first Fe3O4 magnetic microparticles generate a composite multi-dimensional vibration of axial vibration, radial swing, and circumferential vortex, driving the formation of high-frequency micro-vortices inside the magnetic filter element, prompting the residual dirt to break away from the filtration pores of the magnetic filter element. The elastic skeleton is composed of a composite of spiral nickel-titanium shape memory alloy wires 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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