Fresh air machine

Abstract

The application discloses a new fan, which comprises a shell, a heat exchange core and two cover plates, the shell comprises two end plates, the two end plates are located at the upper and lower ends of the shell, and the two end plates are respectively provided with an opening and a mounting portion; the heat exchange core can be mounted into the shell through the opening; the two cover plates are respectively mounted on the two mounting portions, and the cover plates are in one-to-one correspondence with the openings and are used for opening or closing the openings. The new fan of the application is provided with openings on the front surface and the back surface, so that the heat exchange core can be cleaned or replaced, the maintenance requirements during forward installation or reverse installation are met, different installation environments are adapted to, and the installation adaptability is good.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and in particular to a fresh air ventilator. Background Technology

[0002] With the improvement of people's living standards, the usage rate of embedded air conditioners such as fresh air systems is increasing. Generally, fresh air systems are installed in the ceiling. Currently, most fresh air systems are designed for single-sided maintenance, meaning there is only an inspection port on one side of the unit. For different installation environments, such as whether the fresh air inlet and return air inlet face left or right, the unit can only be installed upright to ensure the openings face downwards. When changing the orientation of the fresh air inlet and return air inlet from left to right, the unit can only be rotated horizontally 180°. However, this installation results in the fresh air duct connecting to the fresh air inlet and the return air duct connecting to the return air inlet being arranged in a cross pattern. Therefore, the fresh air ducts and return air ducts occupy more ceiling space, affecting the indoor layout and resulting in poor installation adaptability. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a fresh air fan with openings on both the front and back sides to facilitate cleaning or replacement of the heat exchange core, meeting the maintenance requirements for both forward and reverse installation, adapting to different installation environments, and exhibiting good installation adaptability.

[0004] According to an embodiment of the present invention, a fresh air unit includes a housing, two end plates located at the upper and lower ends of the housing, each end plate having an opening and a mounting portion; a heat exchange core that can be installed into the housing through the opening; and two cover plates respectively installed on the two mounting portions, each cover plate being used to open or close the corresponding opening.

[0005] The fresh air unit according to embodiments of the present invention has at least the following advantages: By providing openings on the upper and lower end plates of the casing, and connecting cover plates for opening or closing these openings, the heat exchange core can pass through these openings. This allows the heat exchange core to be cleaned or replaced from below the fresh air unit through the openings, whether the unit is installed forward or backward (upside down compared to forward installation), thus meeting the maintenance requirements for both forward and reverse installations. Therefore, for different installation environments, the fresh air unit can be installed forward or backward as needed to rationally arrange the fresh air ducts and return air ducts, avoiding the problem of occupying excessive ceiling space, and demonstrating good installation adaptability.

[0006] According to some embodiments of the present invention, the mounting portion includes an extension extending from the opening toward the interior of the housing and a mounting plate connected to the extension, the extension forming a cavity, and the cover plate being received in the cavity and abutting against the mounting plate.

[0007] According to some embodiments of the present invention, the depth of the cavity is greater than or equal to the thickness of the cover plate.

[0008] According to some embodiments of the present invention, one end of the cover plate is connected to the mounting plate via a rotating member.

[0009] According to some embodiments of the present invention, the mounting plate is provided with a mounting recess, the mounting recess being recessed toward the interior of the housing, and the rotating part is accommodated in the mounting recess.

[0010] According to some embodiments of the present invention, the mounting plate is provided with a first clearance groove communicating with the mounting recess, and the end plate is provided with a second clearance groove communicating with the cavity. The first clearance groove and the second clearance groove are located at the same end of the mounting recess along the rotation axis direction of the rotating member.

[0011] According to some embodiments of the present invention, one end of the cover plate is connected to the mounting portion via a rotating member.

[0012] According to some embodiments of the present invention, the edge of the mounting plate is provided with a flange facing the cover plate, and the side of the cover plate facing the mounting plate is provided with a sealing element, which abuts against the flange.

[0013] According to some embodiments of the present invention, a connecting rope is further provided between the end plate and the cover plate, one end of the connecting rope being connected to the end plate and the other end being connected to the cover plate.

[0014] According to some embodiments of the present invention, one end of the connecting rope is provided with a buckle, the end plate or the cover plate is provided with a locking hole, and the buckle is fastened to the locking hole.

[0015] According to some embodiments of the present invention, the housing is provided with a heat insulation body, the heat insulation body is provided with a core cavity and a positioning member, the core cavity is connected to two openings, the positioning member is disposed on the cavity wall of the core cavity, the heat exchange core is installed in the core cavity, and the heat exchange core has a plurality of corners on its periphery, the corners abutting against the positioning member.

[0016] According to some embodiments of the present invention, the end plate and / or the positioning member are rotatably mounted with a pressing member, the pressing member being rotatable to a position abutting against the upper or lower end face of the heat exchange core.

[0017] According to some embodiments of the present invention, the end plate is provided with a support rod placed in the opening, one end of the support rod is inserted into the end plate, and the other end is connected to the end plate by a second fastener, and the support rod is used to support the heat exchange core.

[0018] According to some embodiments of the present invention, both the upper and lower end faces of the heat exchange core are provided with handles.

[0019] According to some embodiments of the present invention, the side wall of the housing is connected with a lifting lug. The lifting lug includes a base and two connecting parts. The two connecting parts are respectively disposed at both ends of the base and located on the same side of the base. Each of the two connecting parts is provided with an opening groove and a limiting part. The limiting part is located at the opening end of the opening groove. The two limiting parts are respectively located on opposite sides or back-to-back sides of the two connecting parts.

[0020] According to some embodiments of the present invention, the connecting portion is provided with two limiting portions, which are respectively located on both sides of the opening end along the width direction of the opening groove.

[0021] According to some embodiments of the present invention, the opening end is located at one end of the connecting portion away from the base.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the fresh air unit in an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 An exploded view of the fresh air system shown.

[0026] Figure 3 This is a schematic diagram of the fresh air unit when both covers are open, according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the top plate structure in an embodiment of the present invention;

[0028] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 This is a schematic diagram of the connecting rope structure in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the lifting lug structure in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the connection between the lifting lug and the suspension rod when the fresh air unit is installed in the forward direction in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the lifting lug structure in another embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the connection between the lifting lug and the hanging rod when the fresh air unit is installed in the forward direction according to another embodiment of the present invention.

[0034] Figure label:

[0035] Shell 100; Top plate 110; Opening 111; Second clearance groove 112; First side plate 120; Fresh air inlet 121; Return air inlet 122; Exhaust air outlet 123; Air inlet 124; Bottom plate 130; Second side plate 140; Mounting plate 150; Mounting recess 151; First clearance groove 152; Flanged edge 153; Slot 154; Cavity 155; Insulation body 160; Positioning component 161; Core cavity 162; Press-fit component 170; Support rod 180;

[0036] Cover plate 200; Rotating component 210; Sealing component 220; Connecting rope 230; Lock 231;

[0037] Heat exchanger core 300; handle 310;

[0038] Lifting lug 400; base 410; reinforcing rib 411; positioning buckle 412; guide part 4121; fixing part 4122; fixing hole 413; through hole 414; first connecting part 420; first opening groove 421; first opening end 422; first adjusting hole 423; second connecting part 430; second opening groove 431; second opening end 432; second adjusting hole 433; first limiting part 440; second limiting part 450;

[0039] 500 for the boom; 510 for the upper nut; 520 for the upper washer; 530 for the lower nut; and 540 for the lower washer. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0042] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0043] In the description of this invention, unless otherwise explicitly defined, terms such as setting, installing, connecting, assembling, and cooperating should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0044] A fresh air system is an air purification device that uses autonomous air supply and exhaust to create air convection, thereby maximizing indoor air exchange and achieving the goal of indoor air purification.

[0045] Generally speaking, fresh air units are installed using a ceiling-mounted method. In related technologies, most current fresh air units are designed for single-sided maintenance, meaning that an access panel is only installed on one side of the equipment, such as the bottom side of the fresh air unit. For different installation environments, such as when the fresh air inlet and return air inlet of the fresh air unit face the left or right side, in order to ensure that the access panel faces downwards, the fresh air unit can only be installed upright, i.e., with the bottom side facing downwards.

[0046] Since fresh air systems can only be installed facing forward, when the fresh air inlet and return air inlet of the fresh air system are changed from facing left to facing right, the fresh air system can only be rotated horizontally by 180°. However, such installation will cause the front and rear positions of the fresh air inlet and return air inlet of the fresh air system to be interchanged, that is, the return air inlet is on the rear side and the fresh air inlet is on the front side. In order to extend the return air duct to the front side, the fresh air duct and return air duct need to be arranged crosswise. Therefore, the fresh air duct and return air duct on the indoor side will occupy more ceiling space, affecting the indoor layout and making the installation adaptability of the equipment poor.

[0047] To solve the above problems, refer to Figures 1 to 6 As shown, an embodiment of the present invention provides a fresh air ventilator, including a housing 100, a heat exchange core 300, and two cover plates 200.

[0048] Reference Figure 1 and Figure 2As shown, it can be understood that the housing 100 has an inner cavity, and the heat exchange core 300 is installed in the inner cavity. Specifically, the housing 100 includes a top plate 110, two first side plates 120 located on the left and right sides, a bottom plate 130, and second side plates 140 integrally formed on the front and rear ends of the bottom plate 130. The two second side plates 140 are perpendicular to the bottom plate 130 and located on the upper side of the bottom plate 130. The two side plates are respectively disposed between the two second side plates 140, and the first side plates 120 are connected to the bottom plate 130 and the two second side plates 140. The top plate 110 is located on the upper side of the bottom plate 130, and the four sides of the top plate 110 are respectively connected to the two second side plates 140 and the two first side plates 120. Thus, the integrally formed bottom plate 130, the two second side plates 140, the two first side plates 120, and the top plate 110 enclose and form the inner cavity. The top plate 110 is the upper end plate of the shell 100, and the bottom plate 130 is the lower end plate of the shell 100.

[0049] Reference Figure 1 and Figure 2 As shown, it can be understood that of the two first side panels 120, one first side panel 120 is provided with a fresh air inlet 121 and a return air inlet 122 communicating with the inner cavity, and the other first side panel 120 is provided with an exhaust air inlet 123 and an air inlet 124 communicating with the inner cavity. Generally speaking, the fresh air inlet 121 and the exhaust air inlet 123 are located at one end near the housing 100 in the front-rear direction, while the return air inlet 122 and the air inlet 124 are located at the other end near the housing 100 in the front-rear direction.

[0050] Reference Figure 2 As shown, the heat exchange core 300 is roughly rectangular in shape and located near the center of the inner cavity. Its four side walls are connected to the fresh air inlet 121, return air inlet 122, exhaust air inlet 123, and air inlet 124 via air ducts. The air inlet 124 connects to the fresh air inlet 121 via the heat exchange core 300, and the return air inlet 122 connects to the exhaust air inlet 123 via the heat exchange core 300, forming two intersecting air ducts. This makes the overall structure of the fresh air unit more compact, achieving a miniaturized design. Simultaneously, the return air inlet 122 can directly connect to the fresh air inlet 121, enabling an internal circulation mode.

[0051] Understandably, typically, the fresh air inlet 121 connects to the indoor space via a fresh air duct, the return air inlet 122 connects to the indoor space via a return air duct, while the air inlet 124 and the exhaust outlet 123 connect to the outdoor space. Stale indoor air enters through the return air duct and return air inlet 122, passes through the heat exchange core 300, and is exhausted to the outside through the exhaust outlet 123. Fresh outdoor air enters through the air inlet 124, passes through the heat exchange core 300, and is introduced into the room through the fresh air inlet 121 and fresh air duct. Within the heat exchange core 300, stale indoor air and fresh outdoor air simultaneously exchange heat, thereby recovering energy into the room and achieving indoor ventilation, keeping the indoor air fresh and clean.

[0052] Understandably, when there is no need to introduce fresh outdoor air, indoor air enters through the return air duct and return air inlet 122, and is exhausted back into the room through the fresh air inlet 121 and fresh air duct, thus achieving internal circulation and allowing indoor air to circulate and be filtered and purified.

[0053] Reference Figure 2 As shown, both the top plate 110 and the bottom plate 130 are provided with openings 111 and mounting portions. Specifically, the two openings 111 are symmetrically arranged in the vertical direction, meaning that the projections of the two openings 111 on the horizontal plane coincide. The heat exchange core 300 can be installed onto the housing 100 through either opening 111. Therefore, the heat exchange core 300 can be replaced through either opening 111.

[0054] Reference Figure 2 As shown, it can be understood that the opening 111 is roughly rectangular, and the size of the opening 111 is slightly larger than the outer dimensions of the heat exchange core 300, so that the heat exchange core 300 can be installed into the inner cavity or removed from the inner cavity for replacement.

[0055] Reference Figures 2 to 4 As shown, both the top plate 110 and the bottom plate 130 are connected to cover plates 200. The two cover plates 200 are respectively installed at two mounting locations, and their shapes are generally rectangular. The cover plate 200 connected to the top plate 110 is used to open or close the opening 111 in the top plate 110, and the cover plate 200 connected to the bottom plate 130 is used to open or close the opening 111 in the bottom plate 130. Generally, the connection structure between the top plate 110 and the cover plate 200, and between the bottom plate 130 and the cover plate 200, is the same, and the opening methods of the two cover plates 200 are the same. For example, one end of the cover plate 200 is hinged to the mounting location of the top plate 110, and the other end is fixedly connected to the mounting location of the top plate 110 by screws. This facilitates opening the cover plate 200 to clean or replace the heat exchange core 300, and ensures a secure connection when closed, preventing the cover plate 200 from falling off. The connection structure between the cover plate 200 and the bottom plate 130 can be referred to the connection structure between the cover plate 200 and the top plate 110.

[0056] Of course, it is understandable that the cover plate 200 can also be directly fixed to the top plate 110 or the bottom plate 130 by screws; or the cover plate 200 can be installed on the top plate 110 or the bottom plate 130 by snap-fit; or the cover plate 200 can be slidably connected to the top plate 110 or the bottom plate 130, that is, the cover plate 200 can be slidably installed on the top plate 110 or the bottom plate 130 along the horizontal plane. The installation method of the cover plate 200 is not specifically limited here.

[0057] It is understandable that when the fresh air unit is installed facing forward, the bottom plate 130 should face downward; when the fresh air unit is installed in reverse, the top plate 110 should face downward.

[0058] Understandably, for an installation environment where the fresh air inlet 121 and return air inlet 122 face to the left, and the exhaust air outlet 123 and inlet air outlet 124 face to the right, the fresh air unit is installed facing forward, i.e., the base plate 130 faces downward. In this case, the return air inlet 122 is located on the side closer to the front, and the fresh air inlet 121 is located on the side closer to the rear. In this configuration, the fresh air duct and return air duct will not be intersected. With this installation method, the cover plate 200 connected to the base plate 130 can be opened from below the fresh air unit to clean or replace the heat exchange core 300, facilitating maintenance.

[0059] Understandably, for installation environments where the fresh air inlet 121 and return air inlet 122 face to the right, and the exhaust outlet 123 and air inlet 124 face to the left, the fresh air unit can be installed in reverse, i.e., with the ceiling panel 110 facing downwards. In other words, the fresh air unit is rotated 180° vertically relative to its forward installation position. At this point, similar to the forward installation, the return air inlet 122 is located closer to the front, and the fresh air inlet 121 is located closer to the rear. The fresh air inlets 121 and return air inlets 122 are not reversed, thus the layout of the fresh air ducts and return air ducts remains unchanged when the fresh air unit is installed in reverse; that is, the return air ducts and fresh air ducts do not intersect. Therefore, this avoids the fresh air ducts and return air ducts occupying more ceiling space, effectively saving ceiling space. With this installation method, the cover 200 connected to the ceiling panel 110 can be opened from below the fresh air unit to clean or replace the heat exchange core 300, facilitating maintenance.

[0060] Therefore, regardless of whether the fresh air unit is installed forward (base plate 130 facing down) or backward (top plate 110 facing down), the heat exchange core 300 can be cleaned or replaced from below through opening 111, meeting the maintenance requirements for both forward and backward installations. Furthermore, since the two openings 111 are symmetrically arranged vertically, the maintenance location is the same for both forward and backward installations. Additionally, the two covers 200 open in the same way, ensuring consistent maintenance for both installation methods and facilitating maintenance. Thus, for different installation environments, the fresh air unit can be installed forward or backward as needed, allowing for a more rational layout of the fresh air ducts and return air ducts, avoiding excessive ceiling space occupation, and offering good installation adaptability.

[0061] The following describes the installation structure of the cover plate 200 connected to the top plate 110 in detail. The installation structure of the cover plate 200 connected to the bottom plate 130 can be referred to the installation structure of the cover plate 200 connected to the top plate 110, and will not be described again here.

[0062] Reference Figure 1 and Figure 4 As shown, the mounting portion includes an extension extending from the opening 111 toward the interior of the housing 100 and a mounting plate 150. The extension forms a recess 155, and the mounting plate 150 is located below the top wall of the top plate 110 and parallel to the top plate 110. When the cover 200 is closed, the cover 200 is accommodated in the recess 155 and abuts against the mounting plate 150, thereby providing a closing space for the cover 200 and defining the specific position of the cover 200 when closed, facilitating operation by maintenance personnel.

[0063] It is understood that the depth of the recess 155 is greater than or equal to the thickness of the cover plate 200. Specifically, the depth of the recess 155 is equal to the thickness of the cover plate 200. When the cover plate 200 is closed, the cover plate 200 is completely contained within the recess 155, and the side of the cover plate 200 facing the inner cavity abuts against the mounting plate 150 for positioning and fixing the cover plate 200. The side of the cover plate 200 facing away from the inner cavity is flush with the top wall of the top plate 110, thus achieving a concealed installation of the cover plate 200. Under normal use of the fresh air unit, the cover plate 200 will not protrude from the top plate 110, thereby maintaining the aesthetic appearance of the fresh air unit, improving product competitiveness, and saving ceiling and packaging space.

[0064] Of course, it is understandable that the cover plate 200 can be directly installed at the opening 111 and protrude from the top plate 110.

[0065] Reference Figure 3As shown, it can be understood that one end of the cover plate 200 is hinged to the mounting portion of the top plate 110, and the other end is fixedly connected to the mounting portion by a first fastener. The opening 111 can be opened or closed by rotating the cover plate 200, which is convenient to operate. Specifically, two rotating parts 210 are connected between one end of the cover plate 200 and the mounting plate 150. The two rotating parts 210 are connected to the same edge of the cover plate 200 and arranged at intervals. The rotating parts 210 can be hinges or hinges. A part of the rotating part 210 is fixedly connected to the mounting plate 150 provided on the top plate 110, and the other part is fixedly connected to the cover plate 200, so that the cover plate 200 is hinged to the top plate 110 for opening or closing, and the cover plate 200 will not fall off when opened, improving safety. The other end of the cover plate 200 is fixedly connected to the mounting plate 150 on the top plate 110 by a first fastener (not shown in the figure). For example, the first fastener is a screw, and the mounting plate 150 is provided with a screw hole that mates with the screw. The cover plate 200 can be fixed by tightening the screw, and the connection is stable and reliable.

[0066] Reference Figure 4 and Figure 5 As shown, it can be understood that the mounting plate 150 is provided with two mounting recesses 151, and the mounting recesses 151 correspond one-to-one with the positions of the rotating member 210. The mounting recesses 151 are recessed into the inner cavity, and the part of the rotating member 210 connected to the mounting plate 150 is accommodated in the mounting recesses 151. Thus, the depth of the mounting recesses 151 offsets the thickness of the part of the rotating member 210 connected to the mounting plate 150, making the mounting structure of the cover plate 200 more compact, and ensuring that when the cover plate 200 is closed, the top wall of the cover plate 200 is flush with the top wall of the top plate 110, preventing the cover plate 200 from protruding from the top plate 110.

[0067] Reference Figure 3 , Figure 4 and Figure 5As shown, it can be understood that the mounting plate 150 is also provided with two first clearance grooves 152. The first clearance grooves 152 are recessed into the inner cavity, and the two first clearance grooves 152 correspond one-to-one with the mounting recesses 151. The first clearance grooves 152 are located at one end of the mounting recesses 151 along the rotation axis direction of the rotating member 210, and the first clearance grooves 152 communicate with the mounting recesses 151. The first clearance grooves 152 can accommodate the rotating shaft of the rotating member 210 or a solid part with an insertion hole for the rotating shaft to pass through. The top plate 110 is provided with a second clearance groove 112, which is recessed into the inner cavity. The second clearance groove 112 is located at one end of the recess 155 along the rotation axis of the rotating member 210 and communicates with the recess 155. At the same time, the second clearance groove 112 and the first clearance groove 152 are located at the same end of the mounting recess 151 along the rotation axis of the rotating member 210. A portion of the edge of the cover plate 200 can be inserted into the second clearance groove 112. Therefore, when installing the cover plate 200, the rotating shaft or the solid part with an insertion hole for the rotating shaft on the rotating member 210 connected to the cover plate 200 can be accommodated in the first clearance groove 152, while a portion of the edge of the cover plate 200 is accommodated in the second clearance groove 112. The cover plate 200 is then moved along the rotation axis of the rotating member 210, so that the two parts of the rotating member 210 are interlocked to achieve a rotational fit, thereby hinged the cover plate 200 to the top plate 110. When removing the cover plate 200, after fully opening the cover plate 200, i.e., when the cover plate 200 is perpendicular to the top plate 110, simply move the cover plate 200 in the opposite direction. The cover plate 200 is easy to install and remove, and has good operability.

[0068] Reference Figure 3 , Figure 4 and Figure 5 As shown, the mounting plate 150 has a flange 153 at its edge, which is bent towards the cover plate 200, i.e., the flange 153 faces upwards and surrounds the opening 111. A sealing element 220 is provided on the side of the cover plate 200 facing the mounting plate 150, i.e., the side of the cover plate 200 facing the inner cavity. The sealing element 220 can be sealing cotton, sealing fiber, or a combination of both, and can be attached to the cover plate 200 by adhesive bonding. When the cover plate 200 is closed, the sealing element 220 presses against the flange 153, thereby forming a good seal between the cover plate 200 and the mounting plate 150, preventing external dust or other foreign objects from entering the inner cavity through the gap between the cover plate 200 and the mounting plate 150, effectively protecting the components in the inner cavity from damage.

[0069] Reference Figure 3 and Figure 6As shown, a connecting rope 230 is provided between the top plate 110 and the cover plate 200. One end of the connecting rope 230 is fixedly connected to the top plate 110, and the other end is connected to the cover plate 200 via a latch 231. Specifically, the latch 231 is designed like a keychain, and the cover plate 200 has a lock hole (not shown in the figure). The latch 231 is fastened to the lock hole, ensuring that the cover plate 200 is always connected to the top plate 110 via the connecting rope 230. Typically, the length of the connecting rope 230 allows the cover plate 200 to be fully opened. Therefore, during maintenance, the connecting rope 230 prevents the cover plate 200 from falling and injuring people, adding a layer of protection and further improving safety.

[0070] Of course, it is understandable that one end of the connecting rope 230 can be fixedly connected to the cover plate 200, and the other end can be connected to the top plate 110 through the buckle 231. This will not be elaborated here.

[0071] Reference Figure 2 As shown, it can be understood that an integral insulation body 160 is provided in the inner cavity of the shell 100, and the insulation body 160 can be polystyrene foam. A core cavity 162 extending vertically is provided in the insulation body 160. The cross-section of the core cavity 162 is approximately rectangular and matches the shape of the heat exchange core 300, and the core cavity 162 communicates with two openings 111. Positioning elements 161 are respectively provided at the four inner corners of the cavity wall of the core cavity 162. The positioning elements 161 are metal parts embedded in the insulation body 160. The heat exchange core 300 has four corners on its periphery. When installing the heat exchange core 300, the four corners abut against the four positioning elements 161 respectively, thereby achieving effective positioning of the heat exchange core 300 and preventing the heat exchange core 300 from becoming loose.

[0072] Reference Figure 3As shown, both the top plate 110 and the bottom plate 130 are provided with pressing members 170. Specifically, the mounting plate 150 on the top plate 110 is provided with two pressing members 170. One end of the pressing member 170 is rotatably connected to the mounting plate 150, and the rotation axis of the pressing member 170 is arranged along the thickness direction of the mounting plate 150. The two pressing members 170 are located at opposite ends of the opening 111. After the heat exchange core 300 is installed in place, rotating the pressing member 170 can move the other end of the pressing member 170 into the opening 111, so that the other end of the pressing member 170 abuts against the upper end surface of the heat exchange core 300. The two pressing members 170 abut against opposite ends of the upper end surface of the heat exchange core 300. Similarly, the mounting plate 150 on the bottom plate 130 is also provided with two pressing members 170. The connection structure of the pressing member 170 on the top plate 110 can be referred to, and will not be described again here. Therefore, the crimping members 170 at the top plate 110 and the bottom plate 130 respectively abut against the upper and lower end faces of the heat exchange core 300, thereby fixing the heat exchange core 300 securely and reliably. When it is necessary to disassemble the heat exchange core 300, rotating the crimping member 170 moves its other end above the mounting plate 150, releasing it from its abutment against the heat exchange core 300, allowing for easy removal. Of course, it is understandable that four crimping members 170 could be provided at both the top plate 110 and the bottom plate 130, with each of the four crimping members 170 corresponding to two sets of diagonal points on the heat exchange core 300, further increasing installation stability.

[0073] Of course, it is understandable that the upper and lower ends of the positioning member 161 can also be rotatably mounted with the pressing member 170; or the upper and lower ends of both mounting plates 150 and the positioning member 161 can be rotatably mounted with the pressing member 170. This allows them to abut against the upper and lower end faces of the heat exchange core 300 respectively, achieving a secure and reliable connection. Further details are omitted here.

[0074] Reference Figure 3As shown, it can be understood that the top plate 110 and the bottom plate 130 are also connected to support rods 180, and the connection method of the support rods 180 at both ends is the same. Specifically, the two support rods 180 are respectively set on the mounting plate 150 at the top plate 110 and the mounting plate 150 at the bottom plate 130. One end of the support rod 180 is inserted into the slot 154 of the mounting plate 150, and the other end is fixedly connected to the mounting plate 150 by a second fastener (not shown in the figure). Generally speaking, the support rod 180 is located in the middle of the heat exchange core 300, and the two support rods 180 abut against the upper end face and the lower end face of the heat exchange core 300, respectively. When the fresh air unit is installed in the forward direction, the support rod 180 at the bottom plate 130 can bear the weight of the heat exchange core 300, that is, it plays the role of supporting the heat exchange core 300; when the fresh air unit is installed in the reverse direction, the support rod 180 at the top plate 110 can bear the weight of the heat exchange core 300, that is, it also plays the role of supporting. Therefore, regardless of whether the fresh air unit is installed in the forward or reverse direction, it can provide effective support for the heat exchange core 300, improve the installation stability of the heat exchange core 300, and make the installation adaptability of the fresh air unit better.

[0075] Reference Figure 3 As shown, it can be understood that three spaced handles 310 are respectively provided on the upper and lower end faces of the heat exchange core 300. The handles 310 are designed with a fabric belt structure. When not in use, the handles 310 are attached to the upper or lower end face of the heat exchange core 300, avoiding the handles 310 occupying the installation space of the heat exchange core 300. Therefore, when installing the heat exchange core 300, it can be lifted by the handles 310 for convenient operation.

[0076] Reference Figure 1 As shown, it can be understood that the sidewalls of the housing 100 are connected to lifting lugs 400. Specifically, the two second side plates 140 of the housing 100 are each connected to two lifting lugs 400. Each lifting lug 400 includes a base 410 and two connecting parts. The two connecting parts are respectively located at the upper and lower ends of the base 410, and are located on the same side of the base 410. The connecting parts are adapted to connect with lifting components (i.e., lifting rods 500). Both connecting parts are provided with opening slots, and the lifting rods 500 can be inserted into the opening slots through the opening ends of the opening slots. The two connecting parts are also provided with limiting parts located at the opening ends of the opening slots. The limiting parts of the two connecting parts are located on opposite sides or back-to-back sides of the two connecting parts.

[0077] Reference Figure 7 As shown, it can be understood that the base 410, the connecting part and the limiting part are all made of sheet metal, and the base 410, the connecting part and the limiting part are an integral structure. The lifting lug 400 has high structural strength. For example, the lifting lug 400 can be obtained by bending a flat plate and machining it. The processing method is simple and easy to produce.

[0078] Alternatively, the base 410, the connecting part, and the limiting part can all be set as block structures, and the base 410, the connecting part, and the limiting part can be integrated into one structure. The lifting lug 400 has high structural strength. For example, the lifting lug 400 can be produced by casting combined with machining, which is also easy to produce.

[0079] It is understood that the base 410 and the connecting part can be an integral structure, while the limiting part and the connecting part can be separate structures. The limiting part can be connected to the connecting part by welding. Of course, the structural form of the limiting part is not limited to a plate structure or a block structure, and no specific limitation is made on the structural form of the limiting part here.

[0080] The following section uses the lifting lug 400, which is formed by bending a flat plate, as an example to explain the specific structure of the lifting lug 400.

[0081] Reference Figure 2 and Figure 7 As shown, it can be understood that the base 410 of the lifting lug 400 is roughly rectangular, with the long side of the base 410 arranged vertically and the short side of the base 410 arranged horizontally. The base 410 is used to connect with the second side plate 140.

[0082] Reference Figure 7 As shown, it can be understood that the base 410 is provided with a plurality of spaced fixing holes 413 so as to fix the lug 400 to the second side plate 140 by screws.

[0083] Reference Figure 7 and Figure 8 As shown, it can be understood that the upper and lower ends of the base 410 are respectively provided with connecting portions, including a first connecting portion 420 and a second connecting portion 430. Both the first connecting portion 420 and the second connecting portion 430 are perpendicular to the base 410 and are located on the side of the base 410 opposite to the second side plate 140. When the fresh air unit is installed in the forward direction, the first connecting portion 420 is located at the upper end and the second connecting portion 430 is located at the lower end; when the fresh air unit is installed in the reverse direction, that is, when the fresh air unit is rotated 180° in the vertical direction, the first connecting portion 420 is located at the lower end and the second connecting portion 430 is located at the upper end.

[0084] Reference Figure 7 As shown, it can be understood that the first connecting part 420 is provided with a first limiting part 440 and a first opening groove 421 that extends vertically. The first opening groove 421 has a first opening end 422. The first limiting part 440 is located at the first opening end 422. The lifting rod 500 can move through the first opening end 422 into the first opening groove 421 so that the lifting rod 500 passes through the first connecting part 420, which is convenient for installation.

[0085] Reference Figure 7As shown, it can be understood that, similarly, the second connecting part 430 is provided with a second limiting part 450 and a second opening groove 431 extending vertically. The second opening groove 431 is vertically corresponding to the first opening groove 421, that is, the projections of the second opening groove 431 and the first opening groove 421 on the horizontal plane coincide. The second opening groove 431 has a second opening end 432, and the second limiting part 450 is located at the second opening end 432. The lifting rod 500 can move through the second opening end 432 into the second opening groove 431 so that the lifting rod 500 passes through the second connecting part 430, facilitating installation.

[0086] Reference Figure 7 and Figure 8 As shown, it can be understood that the two limiting parts are located on opposite sides of the two connecting parts. That is, the first limiting part 440 is located on the side of the first connecting part 420 facing the second connecting part 430, and the second limiting part 450 is located on the side of the second connecting part 430 facing the first connecting part 420. Therefore, when the fresh air unit is installed facing forward, the first limiting part 440 faces downward; when the fresh air unit is installed in reverse, the second limiting part 450 faces downward.

[0087] Reference Figure 8 As shown, it can be understood that the ceiling hanger 500 is generally connected to an upper nut 510 and a lower nut 530, as well as a lower washer 540 located above the lower nut 530 and an upper washer 520 located below the upper nut 510. Before hoisting the fresh air unit, the positions of the lower nuts 530 and lower washers 540 are adjusted so that the lower washers 540 of the four hangers 500 are on the same horizontal plane. This ensures that the fresh air unit is as level as possible in its initial position during installation, facilitating subsequent adjustments to its levelness.

[0088] Reference Figure 7 and Figure 8 As shown, when the fresh air unit is installed upright, the first limiting part 440 faces downwards, and the suspension rod 500 is connected to the first connecting part 420. Specifically, the suspension rod 500 moves through the first open end 422 into the first open groove 421, allowing the suspension rod 500 to pass through the first connecting part 420, with the lower washer 540 and the lower nut 530 located on the lower side of the first connecting part 420. Under the weight of the fresh air unit, the lower side of the first connecting part 420 abuts against the upper side of the lower washer 540. The lower nuts 530 of the four suspension rods 500 can be rotated using a socket wrench to bring the fresh air unit into a horizontal position, which is convenient to operate. Then, the upper nut 510 can be tightened using an open-end wrench, so that the upper nut 510 and the lower nut 530 clamp the first connecting part 420, thus completing the hoisting of the fresh air unit.

[0089] Since the first limiting part 440 faces downward, it can always prevent the lower nut 530 from disengaging from the first connecting part 420 towards the first open end 422. In other words, the first limiting part 440 can prevent the hanger rod 500 from slipping off towards the first open end 422, thus preventing the air purifier from falling off during the tightening of the upper nut 510. This effectively improves the safety and reliability of the air purifier during installation. Furthermore, even if the upper nut 510 becomes loose during use, the hanger rod 500 will not slip off the first connecting part 420, preventing the air purifier from falling off and effectively improving the safety and reliability of the air purifier during use.

[0090] Since there is no limiting structure on the upper side of the first connecting part 420, that is, there is no structure on the upper side of the first connecting part 420 that hinders the rotation of the open wrench, the open wrench has enough operating space to easily tighten the upper nut 510 and facilitates installation and operation.

[0091] Understandably, when the fresh air unit is installed in reverse, the second limiting part 450 faces downwards, and the hanging rod 500 is connected to the second connecting part 430. The connection method between the hanging rod 500 and the second connecting part 430 can be referred to the connection method between the hanging rod 500 and the first connecting part 420 in this embodiment, and will not be repeated here. Similarly, the second limiting part 450 can prevent the hanging rod 500 from slipping towards the second open end 432, avoiding the situation where the hanging rod 500 slips during the tightening of the upper nut 510, which would cause the fresh air unit to fall. This effectively improves the safety and reliability of the fresh air unit during installation and use. Furthermore, there is no structure on the upper side of the second connecting part 430 that would hinder the rotation of the open-end wrench, giving the open-end wrench sufficient operating space to facilitate tightening of the upper nut 510 and simplifying the installation operation.

[0092] Reference Figure 9 and Figure 10 As shown, in some embodiments, it can be understood that the two limiting portions are located on opposite sides of the two connecting portions. That is, the first limiting portion 440 is located on the side of the first connecting portion 420 away from the second connecting portion 430, and the second limiting portion 450 is located on the side of the second connecting portion 430 away from the first connecting portion 420. Therefore, when the fresh air unit is installed facing forward, the second limiting portion 450 faces downward; when the fresh air unit is installed in reverse, the first limiting portion 440 faces downward.

[0093] It is easy to understand that since the two limiting parts are located on opposite sides of the two connecting parts, the distance between the two connecting parts can be made smaller, which is beneficial to reducing the overall structure of the lifting lug 400.

[0094] Reference Figure 9 and Figure 10As shown, when the fresh air unit is installed facing forward, the second limiting part 450 faces downward, and the hanger 500 is connected to the second connecting part 430. Specifically, the hanger 500 moves through the second opening end 432 into the second opening groove 431, allowing the hanger 500 to pass through the second connecting part 430, with the lower washer 540 and the lower nut 530 located on the lower side of the second connecting part 430. Since the first connecting part 420 is located on the upper side of the second connecting part 430 at this time, it is easy to understand that the hanger 500 simultaneously moves through the first opening end 422 into the first opening groove 421, allowing the hanger 500 to pass through both the first connecting part 420 and the second connecting part 430. Under the gravity of the fresh air unit, the lower side of the second connecting part 430 abuts against the upper side of the lower washer 540. Similarly, the lower nuts 530 of the four lifting rods 500 can be turned with a socket wrench to make the fresh air unit horizontal, which is easy to operate. Then, the upper nut 510 can be tightened with an open wrench to clamp the upper nut 510 and the lower nut 530 together with the second connecting part 430, thus completing the hoisting of the fresh air unit.

[0095] Similarly, since the second limiting part 450 is facing downwards at this time, the second limiting part 450 can always prevent the lower nut 530 from disengaging from the second connecting part 430 in the direction of the second open end 432. In other words, the second limiting part 450 can prevent the hanger 500 from slipping in the direction of the second open end 432, thus preventing the hanger 500 from slipping during the tightening of the upper nut 510 and causing the fresh air unit to fall. This effectively improves the safety and reliability of the fresh air unit during installation. Furthermore, even if the upper nut 510 becomes loose during the use of the fresh air unit, the hanger 500 will not slip off the second connecting part 430, preventing the fresh air unit from falling and effectively improving the safety and reliability of the fresh air unit during use.

[0096] Similarly, since there is no limiting structure on the upper side of the second connecting part 430, that is, there is no structure on the upper side of the second connecting part 430 that hinders the rotation of the open wrench, the open wrench has enough operating space to easily tighten the upper nut 510 and facilitates installation and operation.

[0097] Understandably, when the fresh air unit is installed in reverse, the first limiting part 440 faces downwards, and the hanging rod 500 is connected to the first connecting part 420. The connection method between the hanging rod 500 and the first connecting part 420 can refer to the connection method between the hanging rod 500 and the second connecting part 430 in this embodiment, which will not be repeated here. Similarly, the first limiting part 440 can prevent the hanging rod 500 from slipping towards the first open end 422, avoiding the situation where the hanging rod 500 slips during the tightening of the upper nut 510, which would cause the fresh air unit to fall. This effectively improves the safety and reliability of the fresh air unit during installation and use. Furthermore, there is no structure on the upper side of the first connecting part 420 that would hinder the rotation of the open-end wrench, giving the open-end wrench sufficient operating space to facilitate tightening the upper nut 510 and simplifying the installation operation.

[0098] Therefore, the lifting lugs 400 in both embodiments described above can enable both forward and reverse installation of the fresh air unit, allowing it to adapt to different installation environments, providing good applicability and facilitating maintenance. Furthermore, regardless of whether the fresh air unit is installed forward or reverse, the hanger rod 500 will not slip off the lifting lugs 400, effectively improving safety and reliability. The structure of the lifting lugs 400 also does not obstruct the operation of the upper nut 510 on the hanger rod 500 with an open-end wrench, facilitating installation.

[0099] Reference Figure 7 or Figure 9 As shown, each connecting portion is provided with two limiting portions, and the two limiting portions on the same connecting portion are respectively located on both sides (i.e., the left and right sides) of the opening end along the width direction of the opening groove. Specifically, the first connecting portion 420 is provided with two first limiting portions 440 that face the same direction and are spaced apart along the short side direction of the base 410, and the two first limiting portions 440 are located on the left and right sides of the first opening end 422. The second connecting portion 430 is provided with two second limiting portions 450 that face the same direction and are spaced apart along the short side direction of the base 410, and the two second limiting portions 450 are located on the left and right sides of the second opening end 432. Therefore, the two first limiting parts 440 can simultaneously prevent the lower nut 530 from disengaging from the first connecting part 420 in the direction of the first opening end 422, or the two second limiting parts 450 can simultaneously prevent the lower nut 530 from disengaging from the second connecting part 430 in the direction of the second opening end 432, that is, can prevent the lifting rod 500 from slipping out of the lifting lug 400. The double blocking effect of the two first limiting parts 440 or the two second limiting parts 450 can further increase reliability and improve safety.

[0100] Reference Figure 7 or Figure 9As shown, it can be understood that the open end is located at the end of the connecting portion away from the base 410, that is, the open end faces the side of the base 410 away from the second side plate 140. Specifically, the first open end 422 is located at the end of the first connecting portion 420 away from the base 410, and the second open end 432 is located at the end of the second connecting portion 430 away from the base 410. That is, both the first open end 422 and the second open end 432 face the side of the base 410 away from the second side plate 140, and the orientations of the first open end 422 and the second open end 432 are the same. Therefore, when installing the lifting rod 500 onto the lifting lug 400, it is convenient for the installer to observe the relative position of the open end and the lifting rod 500, so as to accurately move the lifting rod 500 into the corresponding opening slot, reducing the installation difficulty and facilitating the installation operation.

[0101] Reference Figure 7 or Figure 9 As shown, it can be understood that a reinforcing rib 411 is provided at the connection between the base 410 and the connecting part. Specifically, the reinforcing rib 411 is a triangular rib, formed by stamping with a rib-pressing die, and the reinforcing rib 411 protrudes towards the side of the base 410 connected to the connecting part. Two triangular ribs are provided at the connection between the first connecting part 420 and the base 410, spaced apart along the short side of the base 410. Two triangular ribs are also provided at the connection between the second connecting part 430 and the base 410, spaced apart along the short side of the base 410. This increases the structural strength of the lifting lug 400 and further improves installation reliability. Of course, it can be understood that the reinforcing rib 411 can also be other structural forms, such as a rib structure welded between the base 410 and the connecting part.

[0102] Reference Figure 8 or Figure 10 As shown, it can be understood that the limiting part and the connecting part are perpendicular to each other. Specifically, the first limiting part 440 and the first connecting part 420 are perpendicular to each other, and the second limiting part 450 and the second connecting part 430 are perpendicular to each other. Preventing the first limiting part 440 and the second limiting part 450 from bending away from the fresh air unit reduces the lateral space occupied by the lifting lug 400, saving installation space, and allows the first limiting part 440 or the second limiting part 450 to effectively block the lower nut 530, preventing the lifting rod 500 from slipping off. Preventing the first limiting part 440 and the second limiting part 450 from bending towards the fresh air unit prevents the first limiting part 440 or the second limiting part 450 from occupying the installation space of the lower nut 530 and the lower washer 540, ensuring that the first connecting part 420 or the second connecting part 430 can abut against the upper side of the lower washer 540, facilitating installation and improving installation reliability.

[0103] Reference Figure 7 and Figure 8As shown, it can be understood that the base 410 is provided with a positioning buckle 412, which is obtained by stamping the base 410. The positioning buckle 412 is bent towards the side of the second side plate 140 and set downward, that is, the positioning buckle 412 protrudes from the side of the base 410 away from the connecting part. When installing the lifting lug 400, the positioning buckle 412 is inserted into the positioning hole (not shown in the figure) of the second side plate 140 to position and pre-fix the lifting lug 400, so that the fixing hole 413 of the lifting lug 400 is aligned with the connecting hole (not shown in the figure) on the second side plate 140, which facilitates the installation operation.

[0104] Reference Figure 7 and Figure 8 As shown, the base 410 is provided with a through hole 414, and the positioning buckle 412 includes a guide part 4121 and a fixing part 4122. Both the guide part 4121 and the fixing part 4122 are plate-shaped structures. The upper end of the fixing part 4122 is connected to the upper edge of the through hole 414 and is set downwards. The angle between the fixing part 4122 and the base 410 is an acute angle. The guide part 4121 is connected to the lower end of the fixing part 4122, and the angle between the guide part 4121 and the fixing part 4122 is an obtuse angle. The guide part 4121 is bent towards one side of the base 410. When the positioning buckle 412 is inserted into the positioning hole (not shown in the figure) of the second side plate 140, the guide part 4121 can guide the positioning buckle 412 into the positioning hole and make the fixing part 4122 snap into the second side plate 140, thereby positioning and pre-fixing the lifting lug 400, reducing the installation difficulty and facilitating operation.

[0105] It is understandable that the positions of the positioning buckle 412 and the positioning hole on the lifting lug 400 and the second side plate 140 can be interchanged, which will not be elaborated here.

[0106] Reference Figure 7 or Figure 9As shown, it can be understood that the connecting part is also provided with an adjustment hole, and the adjustment hole is set as an elongated oval. Specifically, the first connecting part 420 is provided with a first adjustment hole 423, which is located at the end of the first opening groove 421 away from the first opening end 422, and the first adjustment hole 423 communicates with the first opening groove 421. The first adjustment hole 423 extends along both sides (i.e., the left and right sides) of the width direction of the first opening groove 421, that is, the length direction of the first adjustment hole 423 is the same as the short side direction of the base 410. The second connecting part 430 is provided with a second adjustment hole 433, which is located at the end of the second opening groove 431 away from the second opening end 432, and the second adjustment hole 433 communicates with the second opening groove 431. The second adjustment hole 433 extends along both sides (i.e., the left and right sides) of the width direction of the second opening groove 431, that is, the length direction of the second adjustment hole 433 is the same as the short side direction of the base 410. Therefore, when the hanger 500 passes through the first connecting part 420 or the second connecting part 430, that is, through the first adjusting hole 423 or the second adjusting hole 433, the position of the hanger 500 can be adjusted along the short side of the base 410, so that the hanger 500 always remains vertical, improving installation stability. Thanks to the setting of the first adjusting hole 423 and the second adjusting hole 433, a certain error in the installation position of the hanger 500 on the ceiling is allowed, effectively reducing the installation difficulty.

[0107] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A fresh air machine characterized by, include: The housing includes two end plates located at the upper and lower ends of the housing. Each end plate has an opening and a mounting portion. The mounting portion includes an extension extending from the opening toward the interior of the housing and a mounting plate connected to the extension. The extension forms a cavity. The mounting plate has a mounting recess and a first clearance groove communicating with the mounting recess. The mounting recess is recessed toward the interior of the housing. The end plate has a second clearance groove communicating with the cavity. The heat exchange core can be installed into the housing through the opening; Two cover plates, one end of each cover plate is hinged to the two mounting parts by a rotating member, the two cover plates are used to open or close the corresponding openings respectively, and the rotation axes of the two cover plates are located on the rear side of the corresponding openings respectively; Wherein, the first clearance groove and the second clearance groove are located at the same end of the mounting recess along the rotation axis direction of the rotating member, the cover plate can be accommodated in the recess, and the rotating member is partially accommodated in the mounting recess.

2. The fresh air machine of claim 1, wherein: The depth of the cavity is greater than or equal to the thickness of the cover plate.

3. The fresh air machine of claim 1, wherein: The mounting plate has a flange on its edge, which faces the cover plate. The cover plate has a sealing element on the side facing the mounting plate, and the sealing element presses against the flange.

4. The fresh air machine of any one of claims 1 to 3, wherein: A connecting rope is also provided between the end plate and the cover plate, with one end of the connecting rope connected to the end plate and the other end connected to the cover plate.

5. The fresh air machine of claim 4, wherein: One end of the connecting rope is provided with a buckle, and the end plate or the cover plate is provided with a locking hole, and the buckle is fastened to the locking hole.

6. The fresh air machine of claim 1, wherein: The housing contains a heat-insulating body, which has a core cavity and a positioning element. The core cavity is connected to two openings, and the positioning element is located on the cavity wall of the core cavity. The heat exchange core is installed in the core cavity, and the heat exchange core has multiple corners on its periphery, which abut against the positioning element.

7. The fresh air machine of claim 6, wherein: The end plate and / or the positioning member are rotatably mounted with a pressing member, which can be rotated to a position abutting the upper or lower end face of the heat exchange core.

8. The fresh air machine of claim 6 or 7, wherein: The end plate is provided with a support rod placed in the opening. One end of the support rod is inserted into the end plate, and the other end is connected to the end plate through a second fastener. The support rod is used to support the heat exchange core.

9. The fresh air machine of claim 6 or 7, wherein: The heat exchange core is provided with handles on both the upper and lower ends.

10. The fresh air machine of claim 1, wherein: The side wall of the housing is connected to a lifting lug. The lifting lug includes a base and two connecting parts. The two connecting parts are respectively located at both ends of the base and on the same side of the base. Both connecting parts are provided with an opening groove and a limiting part. The limiting part is located at the opening end of the opening groove. The two limiting parts are respectively located on opposite sides or back-to-back sides of the two connecting parts.

11. The fresh air machine of claim 10, wherein: The connecting part is provided with two limiting parts, which are respectively located on both sides of the opening end along the width direction of the opening groove.

12. The fresh air machine of claim 10 or 11, wherein: The opening end is located at the end of the connecting portion that is away from the base.

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