A noise-reducing new air blower

Abstract

The present invention relates to the technical field of fresh air equipment, and specifically to a noise-reducing fresh air fan; it comprises a chassis and a joint arranged on the outer wall of the chassis; a filter screen and a fan body connected to the joint are arranged inside the chassis; a square heat exchange area is protruding from the end face of the chassis; the heat exchange area separates four corner spaces in the chassis; the heat exchange area sliding seal cooperates with a heat exchange core; the heat exchange core can be folded and unfolded; the heat exchange gap in the heat exchange core becomes narrower as the heat exchange core is compressed; tooth grooves are vertically arranged at the corners of the heat exchange area; the present invention drives the cover plate to move in the heat exchange area as the speed of the fan body changes through a driving motor, thereby changing the spacing between adjacent core plates in the heat exchange core passed by the airflow, thereby minimizing the number of core plates to reduce wind resistance and achieve the purpose of noise reduction while ensuring the heat exchange effect between fresh air and return air.

Description

Technical Field

[0001] The invention relates to the technical field of fresh air equipment, in particular to a noise-reducing fresh air fan. Background Art

[0002] With the high airtightness and high energy-saving requirements of modern buildings, indoor air quality has gradually become the focus of people's attention. Traditional ventilation methods mainly rely on opening windows for ventilation, but in urban environments with poor air quality, this method not only leads to direct exchange of indoor and outdoor pollutants, but also may cause secondary pollution problems such as noise and dust. In addition, modern buildings have increasingly higher requirements for energy conservation, and traditional window ventilation methods will cause drastic fluctuations in indoor temperature and increase the energy consumption of air conditioning and heating systems.

[0003] In order to solve these problems, fresh air fans came into being. Fresh air fans are ventilation equipment that can achieve indoor and outdoor air replacement. Their core function is to introduce outdoor fresh air into the room through mechanical ventilation, and at the same time discharge indoor polluted air, so as to keep the indoor air fresh and healthy. Fresh air fans can not only effectively filter PM2.5, pollen, dust and other particulate matter in outdoor air, but also reduce the loss of indoor cold and heat through heat exchange technology to achieve energy saving effect; specifically, it is achieved by using heat exchange cores. The airflow entering the room and the airflow flowing out of the room will pass through the heat exchange core, so as to achieve heat transfer and exchange; although the heat exchange core has the function of heat exchange, it has a certain resistance in the process of airflow passing through the heat exchange core, which will generate noise, especially for low-velocity airflow, the noise caused by the increase in resistance due to the excess heat exchange area is relatively large. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the present invention proposes a noise-reducing fresh air fan. The present invention drives the cover plate to move in the heat exchange area as the rotation speed of the fan body changes through a driving motor, thereby changing the distance between adjacent core plates in the heat exchange core passed by the airflow, thereby ensuring the heat exchange effect between fresh air and return air, while minimizing the number of core plates to reduce wind resistance and achieve the purpose of noise reduction.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a noise-reducing fresh air fan described in the present invention comprises a chassis and a joint arranged on the outer wall of the chassis; a filter screen and a fan body connected to the joint are arranged inside the chassis; a square heat exchange area is protruding from the end surface of the chassis; the heat exchange area separates the four corner spaces in the chassis; the heat exchange area is slidingly sealed to cooperate with the heat exchange core; the heat exchange core can be folded and unfolded; the heat exchange gap in the heat exchange core narrows as the heat exchange core is compressed; teeth are vertically arranged at the corners of the heat exchange area; a rack is slidably connected in the tooth groove; a rotating groove is arranged at the position of the tooth groove away from the heat exchange core; a gear is rotatably connected in the rotating groove; the gear and the rack are meshed and transmitted on the side away from the heat exchange core; a drive motor is fixedly connected in the chassis; the output shaft of the drive motor is fixedly connected to the gear; the upper end of the rack is connected to the upper end of the heat exchange core.

[0006] Preferably, the heat exchange core is composed of a core plate, a shielding film, an elastic member and a cover plate; the plurality of core plates are distributed in sequence from top to bottom; gaps are left between adjacent core plates; the shielding film is fixedly connected to the edge positions between adjacent core plates; the plurality of core plates are staggered to form a first heat exchange gap and a second heat exchange gap; the airflow directions of the first heat exchange gap and the second heat exchange gap intersect; elastic members are provided in the first heat exchange gap and the second heat exchange gap; the cover plate is fixedly connected to the outer side of the topmost core plate; the cover plate is connected to the upper end of the rack.

[0007] Preferably, the elastic member is a corrugated plate-like object; one side of the middle section of the elastic member is fixedly connected to the corresponding core plate; and the elastic member is unfolded under the compression of the adjacent core plate.

[0008] Preferably, there are two tooth grooves, and the two tooth grooves are symmetrically arranged with respect to the cover plate; a lock groove corresponding to the tooth groove is arranged at a corner position of the cover plate; the lock groove is connected to a lock rod for vertical rotation; the upper end of the lock rod extends out of the cover plate and is rotatably connected to the cover plate; a S-shaped groove is arranged at the upper end of the lock rod; the outer wall of the lock rod is connected to a lock block; a clamping groove is arranged at the upper end of the rack corresponding to the lock groove; and the lock block can be clamped into the clamping groove after the lock rod rotates.

[0009] Preferably, the outer wall of the locking rod is connected to the first end face tooth ring along the axial sliding; the outer wall of the middle section of the locking rod and the inner wall of the first end face tooth ring are both square in cross section; the second end face tooth ring is sleeved on the lower end of the locking rod; the locking block is fixedly connected to the first end face tooth ring; the first end face tooth ring is located above the second end face tooth ring; the second end face tooth ring is fixedly connected to the lower groove wall of the locking groove; and the handle is embedded in the upper end of the cover plate.

[0010] Preferably, the shielding film is composed of an outer elastic film and an inner flexible film; the edge of the elastic film is fixedly connected to the edge of the flexible film; a storage cavity for storing the medium is formed between the elastic film and the connected flexible film; and the storage cavity is filled with the medium.

[0011] Preferably, corner columns are provided at four corners of the heat exchange zone extending toward the inside of the chassis; the tooth grooves are provided on the corner columns; the positions where two corner columns are close to each other are provided as corrugated surfaces along the vertical direction; and the elastic membrane is pressurized to expand outward and contact the corrugated surface.

[0012] Preferably, a connecting hole is provided inside the core plate; two upper and lower adjacent storage cavities are connected via the connecting hole; and the medium pressures in all storage cavities are consistent.

[0013] Preferably, the upper part of the heat exchange area protrudes out of the chassis and extends to the outside; the lower part of the heat exchange area is connected to the four corner spaces inside the chassis; and the inner wall of the upper part of the heat exchange area is in contact with the edge of the core plate.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention drives the cover plate to move in the heat exchange area as the rotation speed of the fan body changes through a driving motor, so that the distance between adjacent core plates in the heat exchange core passed by the airflow is changed, thereby minimizing the number of core plates to the greatest extent while ensuring the heat exchange effect between fresh air and return air, thereby achieving the purpose of noise reduction.

[0016] 2. The expanded flexible membrane in the present invention will contact the corrugated surface on the corner column and reach the vertical positioning of the storage cavity again. The storage cavity positioning is the vertical positioning of the core plate. The distance between adjacent core plates will also be limited. The elastic force of the elastic member can increase from top to bottom in sequence, thereby compensating for the gravity of the core plate, the elastic member and the medium in the storage cavity, so that the adjacent core plates are equidistant. After the distance between adjacent core plates is positioned, it is not easy for the airflow to shake during the passage, thereby ensuring as much as possible that each core plate realizes uniform heat transfer and improves the heat exchange effect. In addition, due to the pressure on the storage cavity, the elastic membrane will bulge outward, so that in the process of the airflow entering the heat exchange core, the bulging elastic membrane can reduce the wind resistance, so that the airflow can be more easily diverted into the gap between adjacent core plates, thereby further achieving noise reduction.

[0017] 3. In the present invention, adjacent core plates will approach each other to squeeze the storage cavity. Since all storage cavities are connected through connecting holes, the medium pressure in each storage cavity remains consistent during the storage cavity being compressed. In this way, the adjacent core plates can be kept as parallel as possible under the support of the elastic parts and the storage cavities at the two edge positions, thereby avoiding wind resistance caused by the tilt of the core plates. The parallelism of adjacent core plates will enable the airflow to pass smoothly through the gaps between the core plates, further reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0019] Figure 1 is a stereogram of the present invention;

[0020] Figure 2 is a three-dimensional diagram of the chassis of the present invention;

[0021] Figure 3 is a cross-sectional view of the present invention;

[0022] Figure 4 It is the internal structure diagram of the chassis in the present invention;

[0023] Figure 5 is a three-dimensional diagram of the heat exchange core of the present invention;

[0024] Figure 6 yes Figure 5 The enlarged view of point A in the middle;

[0025] Figure 7 yes Figure 5 The enlarged view of point B in the middle;

[0026] Figure 8 is a three-dimensional diagram of a corner column in the present invention;

[0027] Fig. 9 is a three-dimensional diagram of the cover plate of the present invention;

[0028] Fig.10 yes Fig. 9 Enlarged view of point C in the middle;

[0029] Fig.11 It is a schematic diagram of the structure of the heat exchange core in the present invention;

[0030] Fig.12 yes Fig.11 sectional view of .

[0031] In the figure: chassis 1, joint 11, filter 12, fan body 13, heat exchange area 15, tooth groove 16, rotating groove 17, heat exchange core 2, core plate 21, first heat exchange gap 211, second heat exchange gap 212, connecting hole 213, shielding film 22, elastic film 221, flexible film 222, storage cavity 223, elastic member 23, cover plate 24, handle 241, lock groove 25, lock rod 26, straight groove 261, first end face tooth ring 262, second end face tooth ring 263, lock block 27, rack 3, gear 31, drive motor 32, slot 33, corner column 4, corrugated surface 41. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] like Figures 1 to 12 As shown, the present invention includes the following embodiments:

[0034] Embodiment 1: A noise-reducing fresh air blower, comprising a chassis 1 and a joint 11 provided on the outer wall of the chassis 1; a filter 12 and a blower body 13 connected to the joint 11 are provided inside the chassis 1; a square heat exchange area 15 is provided on the end surface of the chassis 1; the heat exchange area 15 separates four corner spaces in the chassis 1; the heat exchange area 15 is slidably sealed to cooperate with a heat exchange core 2; the heat exchange core 2 can be folded and unfolded; the heat exchange gap in the heat exchange core 2 is compressed as the heat exchange core 2 is compressed. and becomes narrower; a tooth groove 16 is vertically arranged at the corner position of the heat exchange area 15; the rack 3 is slidably connected in the tooth groove 16; a rotation groove 17 is arranged at the position of the tooth groove 16 away from the heat exchange core 2; a gear 31 is rotatably connected in the rotation groove 17; the gear 31 is meshed with the side of the rack 3 away from the heat exchange core 2 for transmission; a drive motor 32 is fixedly connected in the chassis 1; the output shaft of the drive motor 32 is fixedly connected to the gear 31; the upper end of the rack 3 is connected to the upper end of the heat exchange core 2.

[0035] In this embodiment, the heat exchange core 2 is composed of a core plate 21, a shielding film 22, an elastic member 23 and a cover plate 24; a plurality of the core plates 21 are distributed in sequence from top to bottom; gaps are left between adjacent core plates 21; the shielding film 22 is fixedly connected to the edge positions between adjacent core plates 21; a plurality of the core plates 21 are staggered to form a first heat exchange gap 211 and a second heat exchange gap 212; the airflow directions of the first heat exchange gap 211 and the second heat exchange gap 212 intersect; elastic members 23 are provided in both the first heat exchange gap 211 and the second heat exchange gap 212; the cover plate 24 is fixedly connected to the outer side of the topmost core plate 21; the cover plate 24 is connected to the upper end of the rack 3.

[0036] In this embodiment, the elastic member 23 is a corrugated plate-like object; one side of the middle section of the elastic member 23 is fixedly connected to the corresponding core plate 21 ; and the elastic member 23 is unfolded under the pressure of the adjacent core plate 21 .

[0037] When the new fan is started, the driving motor 32 will change according to the speed of the fan body 13 after starting, that is, when the speed of the fan body 13 is slow, the airflow passes through the heat exchange core 2 at a slow speed, and the driving motor 32 will drive the gear 31 to rotate. The rotation of the gear 31 will drive the meshing rack 3 to slide along the tooth groove 16, and the upward movement of the rack 3 will drive the cover plate 24 to move upward. During the upward movement of the cover plate 24, the restriction on the heat exchange core 2 will be gradually released, so that the elastic member 23 will push the adjacent core plates 21 away from each other, thereby increasing the first heat exchange gap 211 and the second heat exchange gap 212, and the external gas will enter the interior of the chassis 1 along one of the joints 11 under the suction effect of one of the fan bodies 13 and pass through The indoor gas will enter the first heat exchange gap 211 in the heat exchange core 2 along another joint 11 under the suction action of another fan body 13 and pass through the second heat exchange gap 212 in the heat exchange core 2. The gas in the second heat exchange gap 212 will transfer the heat to the gas in the first heat exchange gap 211 through the core plate 21 in the heat exchange core 2, so as to realize the heat exchange and transfer. Of course, the gas will pass through the filter 12 when entering the chassis 1. In the process of the airflow passing through the adjusted heat exchange core 2, the number of the core plates 21 in the heat exchange core 2 is reduced, thereby ensuring the heat exchange efficiency and reducing the resistance of the heat exchange core 2 to the airflow, thereby reducing the noise of the fresh air fan operation.

[0038] As the speed of the fan body 13 increases, the driving motor 32 will rotate in the reverse direction, and the driving motor 32 rotating in the reverse direction will drive the gear 31 to rotate in the reverse direction. During the rotation of the gear 31, the rack 3 will be driven to move downward, and during the downward movement of the rack 3, the cover plate 24 will be driven to move downward. During the downward movement of the cover plate 24, multiple core plates 21 will be squeezed, and the cover plate 24 will transfer the downward movement force to the multiple core plates 21. The adjacent core plates 21 will overcome the elastic members 23 in the gap and approach each other, so that the first heat exchange gap 211 and the second heat exchange gap 212 become smaller. Since the number of core plates 21 in the heat exchange core 2 through which the airflow passes is increased, the heat exchange effect of the heat exchange core 2 on the airflow is guaranteed.

[0039] If the fresh air fan stops working, the fan body 13 will also stop working, so the driving motor 32 will control the cover plate 24 to continue to move downward. During the downward movement of the cover plate 24, multiple core plates 21 will be squeezed, so that the first heat exchange gap 211 and the second heat exchange gap 212 are reduced and closed, thereby achieving the partition purpose of the fresh air fan. The distance between adjacent core plates 21 will change with the rotation speed of the fan body 13. In the process of the distance between adjacent core plates 21 becoming smaller, the elastic member 23 will be compressed and expanded. In the process of the distance between adjacent core plates 21 becoming larger, the elastic member 23 will fold each other under the action of its own elastic force and push the adjacent core plates 21 open. It can be seen that only If the distance between adjacent core plates 21 changes, the elastic member 23 will scrape against the core plate 21. The corrugated elastic member 23 can scrape dust and other impurities on the surface of the core plate 21, thereby cleaning the impurities on the surface of the core plate 21. Even if the airflow entering the heat exchange core 2 passes through the filter 12, impurities will inevitably adhere to the core plate 21 after long-term use. By scraping the surface of the core plate 21, the impurities are easier to be blown away after gathering. When the gap between adjacent core plates 21 changes, the core plates 21 will not be blocked by impurities, and the cleaning effect of the elastic member 23 is combined to ensure the smoothness of the gap between adjacent core plates 21.

[0040] In this embodiment, the cover plate 24 is driven by the driving motor 32 to move in the heat exchange area 15 as the rotation speed of the fan body 13 changes, so that the distance between adjacent core plates 21 in the heat exchange core 2 passed by the airflow is changed, thereby minimizing the number of core plates 21 to reduce wind resistance while ensuring the heat exchange effect between fresh air and return air, thereby achieving the purpose of noise reduction.

[0041] Embodiment 2: There are two tooth grooves 16, and the positions of the two tooth grooves 16 are symmetrical about the cover plate 24; a lock groove 25 corresponding to the tooth groove 16 is provided at the corner position of the cover plate 24; the lock groove 25 is connected to the lock rod 26 for rotation up and down; the upper end of the lock rod 26 extends out of the cover plate 24 and is rotationally connected to the cover plate 24; a straight groove 261 is provided at the upper end of the lock rod 26; the outer wall of the lock rod 26 is connected to the lock block 27; a slot 33 is provided at the upper end of the rack 3 corresponding to the lock groove 25; the lock block 27 can be inserted into the slot 33 after the lock rod 26 rotates.

[0042] In this embodiment, the outer wall of the locking rod 26 is connected to the first end face tooth ring 262 along the axial sliding; the cross-sections of the outer wall of the middle section of the locking rod 26 and the inner wall of the first end face tooth ring 262 are both square; the second end face tooth ring 263 is sleeved on the lower end of the locking rod 26; the locking block 27 is fixedly connected to the first end face tooth ring 262; the first end face tooth ring 262 is located above the second end face tooth ring 263; the second end face tooth ring 263 is fixedly connected to the lower groove wall of the locking groove 25; and the upper end of the cover plate 24 is embedded with the handle 241.

[0043] When the heat exchange core 2 needs to be replaced, the driving motor 32 will drive the rack 3 to move up in the tooth groove 16 through the gear 31, so that the cover plate 24 moves to the upper end of the heat exchange area 15 as the rack 3 moves up. As the rack 3 moves up, the slot 33 on the rack 3 moves up, and the slot 33 on the rack 3 drives the locking block 27 and the cover plate 24 to move up. During the upward movement of the cover plate 24, the core plate 21 is pulled up, and the adjacent core plates 21 are pushed open by the elastic member 23. However, due to the limitation of the shielding film 22 at the edge position between the core plates 21, the position of the upper movement of multiple core plates 21 and the cover plate 24 is The locking block 27 is unlocked by the handle 241. The locking block 27 is locked by the handle 241. The locking block 27 is unlocked by the handle 241.

[0044] After the new heat exchange core 2 is placed, the rotating rod is rotated, and the rotating rod will drive the locking block 27 to move from the locking groove 25 into the locking groove 33, so that the cover plate 24 and the upper end of the rack 3 are stuck, and then the rack 3 will drive the locking block 27 to move downward through the locking groove 33 during the downward movement. Since the cover plate 24 has an upward resistance of the elastic part 23, the locking block 27 will drive the first end face tooth ring 262 to contact the second end face tooth ring 263, so as to lock the locking block 27. As the cover plate 24 moves lower, the first end face tooth ring 262 and the second end face tooth ring 263 are locked more tightly.

[0045] Embodiment 3: The shielding film 22 is composed of an outer elastic film 221 and an inner flexible film 222; the edge of the elastic film 221 is fixedly connected to the edge of the flexible film 222; a storage cavity 223 for storing a medium is formed between the elastic film 221 and the connected flexible film 222; the storage cavity 223 is filled with a medium.

[0046] In this embodiment, corner columns 4 are provided at the four corners of the heat exchange area 15 and extend toward the inside of the chassis 1; the tooth grooves 16 are provided on the corner columns 4; the positions where two corner columns 4 are close to each other are provided as corrugated surfaces 41 along the vertical direction; and the elastic membrane 221 is pressurized to expand outward and contact the corrugated surface 41.

[0047] After the heat exchange core 2 is assembled, the drive motor 32 will start to drive the gear 31 to mesh with the rack 3 for transmission. The rack 3 will drive the cover plate 24 to move downward during its downward movement. During the downward movement of the cover plate 24, it is necessary to overcome multiple elastic members 23 to squeeze the core plate 21, so that multiple core plates 21 will be pressurized. When the core plate 21 is under pressure, the fresh air fan is enabled, and when the adjacent core plates 21 are under pressure, the storage cavity 223 will be squeezed. The storage cavity 223 can be filled with gas or liquid. The storage cavity 223 is formed by bonding the inner flexible membrane 222 and the outer elastic membrane 221 edge together. In this way, when the storage cavity 223 is under pressure, the storage One side of the flexible membrane 222 of the storage cavity 223 cannot expand inward, and can only expand outward by relying on the elastic membrane 221. In this way, when the storage cavity 223 is under pressure, the storage cavity 223 will expand and transfer outward, so that the elastic membrane 221 expands outward. During the expansion process, the elastic membrane 221 will enter between the two corner columns 4. After the elastic membrane 221 swells, it will contact the corrugated surface 41 of the two corner columns 4 close to each other. The setting of the corrugated surface 41 will make it difficult for the elastic membrane 221 to move after it swells, so as to achieve the purpose of vertical positioning of the storage cavity 223. As the drive motor 32 rotates with the speed of the fan body 13, During the process, whether the cover plate 24 moves up or down, the multiple core plates 21 will also move with the movement of the cover plate 24. The core plate 21 will drive the storage cavity 223 to move synchronously during the up and down movement. The storage cavity 223 can be deformed under pressure, so it can be deformed under the action of external force and pass through the corrugated surface 41 smoothly. After the storage cavity 223 moves down and stops moving, the expanded flexible membrane 222 will contact the corrugated surface 41 on the corner column 4, and reach the vertical positioning of the storage cavity 223 again. The positioning of the storage cavity 223 is the vertical positioning of the core plate 21, and the distance between adjacent core plates 21 will also be limited, and the elastic The elastic force of the component 23 can be increased from top to bottom, thereby compensating for the gravity of the core plate 21, the elastic component 23 and the medium in the storage cavity 223, so that the adjacent core plates 21 are equidistant. After the adjacent core plates 21 are positioned, the distance between them makes it difficult for the airflow to shake during the passage, thereby ensuring that the heat transfer of each core plate 21 is uniform as much as possible, thereby improving the heat exchange effect; in addition, since the storage cavity 223 is pressurized, the elastic membrane 221 will bulge outward, so that in the process of the airflow entering the heat exchange core 2, the bulging elastic membrane 221 can reduce the wind resistance, so that the airflow can be more easily diverted into the gap between adjacent core plates 21, thereby further achieving noise reduction.

[0048] Embodiment 4: A connecting hole 213 is provided inside the core plate 21 ; two upper and lower adjacent storage cavities 223 are connected via the connecting hole 213 ; the medium pressure in all storage cavities 223 is consistent.

[0049] In this embodiment, the upper part of the heat exchange area 15 protrudes out of the chassis 1 and extends to the outside; the lower part of the heat exchange area 15 is connected to the four corner spaces inside the chassis 1; and the inner wall of the upper part of the heat exchange area 15 contacts the edge of the core plate 21.

[0050] During the downward movement of the cover plate 24, the adjacent core plates 21 will approach each other and squeeze the storage chamber 223. Since all the storage chambers 223 are connected through the connecting hole 213, the medium pressure in each storage chamber 223 remains consistent during the process of the storage chamber 223 being pressurized. In this way, the adjacent core plates 21 can be kept as parallel as possible under the support of the elastic member 23 and the storage chambers 223 at the two edge positions, thereby avoiding the wind resistance caused by the tilt of the core plates 21. The parallelism of the adjacent core plates 21 will enable the airflow to smoothly pass through the gaps between the core plates 21. During the downward movement of the cover plate 24, all the storage chambers 223 will be pressurized, but the storage chamber 223 in the upper part of the heat exchange zone 15 is difficult to expand outward due to the obstruction of the inner wall of the upper part of the heat exchange zone 15, so that the medium in the storage chamber 223 in the upper part of the heat exchange zone 15 will flow into the storage chamber 223 in the lower part of the heat exchange zone 15 along the connecting hole 213, causing the storage chamber 223 in the lower part of the heat exchange zone 15 to further expand. The storage cavity 223 in the upper part of the heat exchange zone 15 cannot expand outward, so that the distance between adjacent core plates 21 in the upper part of the heat exchange zone 15 cannot be further compressed. As the storage cavity 223 in the upper part of the heat exchange zone 15 moves downward in sequence and is exposed and released after entering the lower part of the heat exchange zone 15, the core plate 21 in the lower part of the heat exchange zone 15 will be further compressed and then slightly expanded. This process is repeated, and the distance between adjacent core plates 21 decreases in a variable manner. In the process of the distance between the core plates 21 decreasing in a variable manner, the elastic member 23 further scrapes the surface of the core plate 21, thereby improving the cleaning frequency and cleaning effect. Similarly, in the process of the cover plate 24 moving upward, the distance between the core plates 21 will gradually increase. In the process of the storage cavity 223 entering from the lower part of the heat exchange zone 15 to the upper part, the core plate 21 in the lower part of the heat exchange zone 15 will expand and then be further compressed. This process is repeated, and the distance between adjacent core plates 21 increases in a variable manner, so that the surface of the core plate 21 is frequently scraped by the elastic member 23, thereby improving the cleaning effect.

[0051] Embodiment 5: The filter screen 12 is arranged inside the joint 11 or inside the chassis 1 at a position close to the heat exchange area 15 .

[0052] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A noise-reducing fresh air blower, comprising a case (1) and a joint (11) arranged on the outer wall of the case (1); a filter (12) and a blower body (13) connected to the joint (11) are arranged inside the case (1); the characteristics are: The end surface of the chassis (1) is provided with a square heat exchange area (15); the heat exchange area (15) separates four corner spaces in the chassis (1); the heat exchange area (15) is slidably sealed to cooperate with the heat exchange core (2); the heat exchange core (2) can be folded and unfolded; the heat exchange gap in the heat exchange core (2) becomes narrower as the heat exchange core (2) is compressed; tooth grooves (16) are vertically provided at the corners of the heat exchange area (15); the tooth grooves (16) are slidably sealed to cooperate with the heat exchange core (2) The rack (3) is connected to the housing (1); a rotation groove (17) is provided at a position of the tooth groove (16) away from the heat exchange core (2); a gear (31) is rotatably connected in the rotation groove (17); the gear (31) is meshed with the side of the rack (3) away from the heat exchange core (2) for transmission; a drive motor (32) is fixedly connected to the housing (1); the output shaft of the drive motor (32) is fixedly connected to the gear (31); the upper end of the rack (3) is connected to the upper end of the heat exchange core (2).

2. A noise reduction fresh air blower according to claim 1, characterized in that: The heat exchange core (2) is composed of a core plate (21), a shielding film (22), an elastic member (23) and a cover plate (24); the plurality of core plates (21) are distributed in sequence from top to bottom; gaps are left between adjacent core plates (21); the shielding film (22) is fixedly connected to the edge position between adjacent core plates (21); the plurality of core plates (21) are staggered to form a first heat exchange gap (211) and a second heat exchange gap (212); the airflow directions of the first heat exchange gap (211) and the second heat exchange gap (212) intersect; the elastic member (23) is provided in both the first heat exchange gap (211) and the second heat exchange gap (212); the cover plate (24) is fixedly connected to the outer side of the topmost core plate (21); the cover plate (24) is connected to the upper end of the rack (3).

3. A noise reduction fresh air blower according to claim 2, characterized in that: The elastic member (23) is a corrugated plate-like object; one side of the middle section of the elastic member (23) is fixedly connected to the corresponding core plate (21); and the elastic member (23) is expanded under the pressure of the adjacent core plate (21).

4. A noise reduction fresh air blower according to claim 2, characterized in that: There are two tooth grooves (16), and the positions of the two tooth grooves (16) are symmetrically arranged with respect to the cover plate (24); a locking groove (25) corresponding to the tooth groove (16) is arranged at a corner position of the cover plate (24); the locking groove (25) is connected to the locking rod (26) for rotation up and down; the upper end of the locking rod (26) extends out of the cover plate (24) and is rotationally connected to the cover plate (24); a straight groove (261) is arranged at the upper end of the locking rod (26); the outer wall of the locking rod (26) is connected to the locking block (27); a clamping groove (33) is arranged at the upper end of the rack (3) corresponding to the locking groove (25); the locking block (27) can be clamped into the clamping groove (33) after the locking rod (26) rotates.

5. A noise reduction fresh air blower according to claim 4, characterized in that: The outer wall of the locking rod (26) is connected to the first end face toothed ring (262) in an axially sliding manner; the outer wall of the middle section of the locking rod (26) and the inner wall of the first end face toothed ring (262) are both square in cross section; the second end face toothed ring (263) is sleeved on the lower end of the locking rod (26); the locking block (27) is fixedly connected to the first end face toothed ring (262); the first end face toothed ring (262) is located above the second end face toothed ring (263); the second end face toothed ring (263) is fixedly connected to the lower groove wall of the locking groove (25); and the upper end of the cover plate (24) is embedded with the handle (241).

6. A noise reduction fresh air blower according to claim 2, characterized in that: The shielding film (22) is composed of an outer elastic film (221) and an inner flexible film (222); the edge of the elastic film (221) is fixedly connected to the edge of the flexible film (222); a storage cavity (223) for storing a medium is formed between the elastic film (221) and the connected flexible film (222); and the storage cavity (223) is filled with a medium.

7. A noise reduction fresh air blower according to claim 6, characterized in that: Corner columns (4) are provided at four corner positions of the heat exchange area (15) and extend toward the inside of the chassis (1); the tooth grooves (16) are provided on the corner columns (4); positions where two corner columns (4) are close to each other are provided to form a corrugated surface (41) along the vertical direction; and the elastic membrane (221) is compressed and expands outwardly to contact the corrugated surface (41).

8. The noise-reducing fresh air blower according to claim 6, characterized in that: A communication hole (213) is provided inside the core plate (21); two upper and lower adjacent storage cavities (223) are connected via the communication hole (213); and the medium pressure in all storage cavities (223) is consistent.

9. The noise-reducing fresh air blower according to claim 6, characterized in that: The upper part of the heat exchange area (15) protrudes from the chassis (1) and extends to the outside; the lower part of the heat exchange area (15) is connected to the four corner spaces inside the chassis (1); and the inner wall of the upper part of the heat exchange area (15) is in contact with the edge of the core plate (21).

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