An air exchange and purification device

Abstract

The present invention provides a ventilation and purification device, which belongs to the technical field of ventilation equipment. It includes a pipeline with a fan installed inside. One end of the pipeline is connected to a filter box through a connection port, and the other end is provided with a first air outlet located outdoors. The filter box has an installation cavity connected to the pipeline. A filter component is arranged in the installation cavity. The filter component divides the installation cavity into a first cavity and a second cavity. The first cavity is connected to the pipeline, and a sound-absorbing layer opposite to the filter component is arranged in the second cavity. A second air outlet located indoors and connected to the second cavity is arranged on the side wall of the filter box corresponding to the sound-absorbing layer and the filter component. The distance between the sound-absorbing layer and the filter component is not greater than 50 millimeters. The connection port is eccentrically arranged with respect to the center of the filter box, and the outer edge of the connection port and the second air outlet are separated by a set distance along the direction parallel to the cross-section of the connection port. Through the relatively arranged filter component and sound-absorbing layer, while effectively absorbing air noise, it avoids making the sound-absorbing structure very complex.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation equipment, and particularly to a ventilation and purification device. Background Art

[0002] Places such as factories, residences, workshops, offices, and bedrooms are generally relatively enclosed spaces with poor air circulation. After a long time without ventilation, the air quality indoors will deteriorate, affecting human health. Therefore, how to improve the air quality in enclosed rooms is one of the current research hotspots.

[0003] In the related art, an installation groove is usually opened on the wall separating the indoor and outdoor areas for installing a ventilation device. The ventilation device includes a housing installed in the installation groove, a fan provided in the housing, and a ventilation duct connecting the indoor and outdoor areas. The fan can rotate forward and backward. When the fan rotates forward, air can flow from the outdoor to the indoor through the ventilation duct. Or, when the fan rotates backward, air can flow from the indoor to the outdoor through the ventilation duct, thereby completing the ventilation of the enclosed room. At the same time, a ventilation duct composed of sound-absorbing cotton is also provided in the ventilation device to absorb the noise generated during ventilation.

[0004] However, in the current ventilation device, the ventilation channel composed of sound-absorbing cotton usually has a relatively complex structure to extend the distance that air flows through it to effectively absorb noise, thus slowing down the exhaust and ventilation efficiency. Therefore, there is an urgent need for a ventilation device that can achieve efficient sound absorption while having a simple ventilation duct. Summary of the Invention

[0005] An embodiment of the present invention provides a ventilation and purification device to solve the problem that the ventilation duct composed of sound-absorbing cotton in the ventilation device in the related art usually has a relatively complex structure to extend the distance that air flows through it to effectively absorb noise, thus slowing down the exhaust and ventilation efficiency.

[0006] An embodiment of the present invention provides a ventilation and purification device, including a pipe with a fan installed inside; one end of the pipe is connected to a filter box through a connection port, and the other end is provided with a first air outlet located outdoors; the filter box has an installation cavity connected to the pipe, and a filter component is provided in the installation cavity. The filter component divides the installation cavity into a first cavity and a second cavity; the first cavity is connected to the pipe;

[0007] A sound-absorbing layer opposite to the filter component is provided in the second cavity. A second air outlet located indoors and connected to the second cavity is provided on the side wall of the filter box corresponding to the sound-absorbing layer and the filter component. The distance between the sound-absorbing layer and the filter component is not greater than 50 millimeters; the connection port is eccentrically arranged with respect to the center of the filter box, and the outer edge of the connection port is separated from the second air outlet by a set distance along the direction parallel to the cross-section of the connection port.

[0008] The air exchange and purification device as described above, wherein an air vent allowing air to enter the first cavity is provided on the peripheral wall structure of the first cavity, and a seal is movably provided relative to the air vent; the seal closes the air vent when the pressure in the first cavity is greater than the external pressure, and moves away from the air vent when it is less than the external pressure.

[0009] The air exchange and purification device as described above, wherein the seal is a sealing film covering the air vent on the inner side surface of the first cavity, the sealing film has a connecting end connected to the peripheral wall structure, and an acting end that moves relative to the connecting end under the action of the pressure difference between the inside and outside of the first cavity; during the movement of the acting end, there is a sealing state where at least part of the edge fits against the outer periphery of the air vent, and a ventilation state where at least part of the edge does not fit against the outer periphery of the air vent.

[0010] The air exchange and purification device as described above, wherein the air vent is provided on the side wall of the filter box corresponding to the first cavity.

[0011] The air exchange and purification device as described above, wherein the air vent is provided on the filter component and communicates the first cavity and the second cavity.

[0012] The air exchange and purification device as described above, wherein the filter component includes an outer frame and a filter net installed in the outer frame; the air vent is formed at a set distance from the edge of the filter net to the frame; the connecting end is connected to the outer frame.

[0013] The air exchange and purification device as described above, wherein the air vent is a rectangular opening, and the connecting end is provided at the edge of one side of the air vent.

[0014] The air exchange and purification device as described above, wherein a plurality of second air vents are evenly provided around the filter box, and the sound absorption panel is arranged parallel to the filter component.

[0015] The air exchange and purification device as described above, wherein the second air vent is only provided on one side wall of the filter box corresponding to the side between the sound absorption layer and the filter component, the sound absorption layer is inclined relative to the filter component, and the distance between the sound absorption layer and the filter component gradually increases along the direction close to the second air vent.

[0016] The air exchange and purification device as described above, wherein a regenerative heat exchanger is provided in the pipeline.

[0017] The ventilation device provided by the embodiment of the present invention has a fan arranged in a pipeline and a filtering component and a sound-absorbing layer opposite to the filtering component arranged in a filtering box. Under the action of the fan, air can flow from the outside to the inside of the room. First, it enters the pipeline through the first air outlet, flows through the pipeline and then enters the first cavity of the filtering box, and then passes through the filtering component to enter the second cavity. At this time, the air has been purified by the filtering component. The air entering the second cavity continues to flow forward until it contacts the sound-absorbing layer. After the sound-absorbing layer absorbs the noise, the air enters the room through the second air outlet, realizing the functions of delivering fresh air to the room and reducing noise. At the same time, the sound-absorbing layer and the filtering component are arranged opposite to each other and the distance therebetween is not greater than 50 millimeters. While effectively absorbing the air noise, the ventilation air duct structure formed by the sound-absorbing layer is simple and not complicated, and will not affect the ventilation and exhaust efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Structural schematic diagram of the ventilation and purification device provided by the embodiment of the present invention Figure 1 ;

[0020] Figure 2 Top view of the ventilation and purification device provided by the embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the ventilation opening of the ventilation and purification device provided by the embodiment of the present invention being closed;

[0022] Figure 4 Schematic diagram of the ventilation opening of the ventilation and purification device provided by the embodiment of the present invention being opened;

[0023] Figure 5 Structural schematic diagram of the ventilation and purification device provided by the embodiment of the present invention Figure 2 ;

[0024] Figure 6 is Figure 5 Cross-sectional view taken along the line A-A in

[0025] Figure 7 Structural schematic diagram of the ventilation and purification device provided by the embodiment of the present invention Figure 3 .

[0026] Description of the reference numerals:

[0027] 1: Pipeline;

[0028] 11: First air inlet;

[0029] 12: Ventilation duct;

[0030] 13: Duct fan section;

[0031] 14: Shielding cover;

[0032] 15: Connection port;

[0033] 2: Fan;

[0034] 3: Filter box;

[0035] 31: First cavity;

[0036] 32: Second cavity;

[0037] 33: Second air inlet;

[0038] 4: Filter component;

[0039] 5: Ventilation port;

[0040] 6: Seal;

[0041] 61: Connection end;

[0042] 62: Acting end;

[0043] 7: Sound-absorbing layer;

[0044] 8: Cover plate;

[0045] 9: Heat storage type heat exchanger. Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0047] In the present invention, unless otherwise clearly specified, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral molding; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, or the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] A ventilation and purification device provided by an embodiment of the present invention aims to improve the problem of the complex ventilation duct formed by sound-absorbing cotton in the current ventilation and purification device. Usually, the sound-absorbing cotton in the ventilation device is arranged in the ventilation duct. When air flows in the ventilation duct, whether it flows from the indoor to the outdoor or from the outdoor to the indoor, it must flow through the sound-absorbing cotton. In order to improve the sound-absorbing effect of the sound-absorbing cotton, the sound-absorbing cotton is usually formed into a curved duct to increase the flow distance of air therein so as to fully absorb air noise. However, this will lead to a complex design structure and also affect the ventilation and exhaust efficiency.

[0049] In view of this, an embodiment of the present invention provides a novel ventilation and purification device. In this ventilation and purification device, the sound-absorbing layer and the filter component are arranged opposite to each other and maintain a suitable distance. After air flows through the filter component under the action of a fan, it still continues to flow forward at a certain speed until it contacts the sound-absorbing layer, so that the air can fully contact the attracting layer and then flow into the room. There is no need to specially set up a duct with a complex structure, and at a suitable distance, the sound-absorbing effect is remarkable and the ventilation and exhaust efficiency will not be affected.

[0050] Figure 1 Structural schematic of the ventilation and purification device provided by an embodiment of the present invention Figure 1 ; Figure 2 Top view of the ventilation and purification device provided by an embodiment of the present invention; Figure 3 Schematic diagram of the ventilation port closed in the ventilation and purification device provided by an embodiment of the present invention; Figure 4 Schematic diagram of the ventilation port opened in the ventilation and purification device provided by an embodiment of the present invention; Figure 5 Structural schematic of the ventilation and purification device provided by an embodiment of the present invention Figure 2 ; Figure 6 For Figure 5 Cross-sectional view taken along the A-A direction in Figure 7 Structural schematic of the ventilation and purification device provided by an embodiment of the present invention Figure 3 .

[0051] Please refer to Figures 1 to 7。This embodiment provides a ventilation and purification device, which includes a duct 1 with a fan 2 installed inside. One end of the duct 1 is connected to a filter box 3 through a connection port 15, and the other end is provided with a first air outlet 11 located outdoors. The filter box 3 has an installation cavity connected to the duct 1, and a filter component 4 is arranged in the installation cavity. The filter component 4 divides the installation cavity into a first cavity 31 and a second cavity 32. The first cavity 31 is connected to the duct 1.

[0052] A sound-absorbing layer 7 is arranged in the second cavity 32 opposite to the filter component 4. A second air outlet 33, which is connected to the second cavity 32 and located indoors, is arranged on the side wall of the filter box 3 corresponding to the sound-absorbing layer 7 and the filter component 4. The distance between the sound-absorbing layer 7 and the filter component 4 is not greater than 50 millimeters. The connection port 15 is eccentrically arranged with respect to the center of the filter box 3, and the outer edge of the connection port 15 is at a set distance from the second air outlet 33 along the direction parallel to the cross-section of the connection port 15.

[0053] Among them, the fan 2 has a forward and reverse rotation function. When the fan 2 rotates forward, the ventilation and purification device provides fresh air to the room. Outdoor air flows into the interior of the duct 1 from the first air outlet 11, and then flows from the duct 1 into the first cavity 31. At this time, the internal pressure of the first cavity 31 is greater than the external air pressure, and the seal 6 closes the ventilation port 5. The air in the first cavity 31 passes through the filter component 4 and then flows into the second cavity 32. Since the distance between the sound-absorbing layer 7 and the filter component 4 is not greater than 50 millimeters, the air can impact the sound-absorbing layer 7 at a relatively high speed, fully contact with the sound-absorbing layer 7, and finally flow into the room from the second air outlet 33 of the second cavity 32, effectively absorbing the noise contained in the air. When the fan rotates in reverse, it flows into the second cavity 32 through the second air outlet 33, then enters the first cavity 31 through the filter component 4 from the second cavity 32, then flows into the duct 1 from the first cavity 31, and finally flows out of the duct 1 from the first air outlet 11. It can be understood that when the power of the fan 2 increases, the distance between the sound-absorbing layer 7 and the filter component 4 can be appropriately increased.

[0054] Optionally, the fan 2 described in this embodiment can be an axial flow fan. At this time, the axis of the plane where the fan blades rotate should be parallel or approximately parallel to the axis of the duct 1.

[0055] The connection port 15 is eccentrically arranged with respect to the center of the filter box 3, and the outer edge of the connection port 15 and the second air outlet 33 are separated by a set distance in the direction parallel to the cross-section of the connection port 15, which can effectively increase the contact time between the air and the sound-absorbing layer 7, and further improve the sound-absorbing effect of the sound-absorbing layer 7. Taking the second air outlet 33 arranged on the top surface of the filter box 3 as an example, at this time, the connection port 15 can be arranged at a position close to the bottom surface of the filter box 3. During the whole process that the air flows into the first cavity 31 from the connection port 15 and then flows into the second cavity 32 through the filter component 4 from the first cavity 31, it can be regarded as parallel flow. The contact position of the air and the sound-absorbing layer 7 is located at a position close to the bottom surface of the filter box 3. During the process that the air flows upward in the second cavity 32 to the second air outlet 33, the sound-absorbing layer 7 can continue to absorb the air noise, and further improve the sound-absorbing effect. Exemplarily, the set distance can be not less than 30 millimeters.

[0056] In addition, the ventilation and purification device described in this embodiment is usually arranged on the non-load-bearing wall separating the indoor and outdoor areas. A through groove adapted to the shape of the pipeline 1 is opened on the wall. Most of the pipeline 1 is installed inside the wall, and the filter box 3 is located outside the wall and inside the room, and one side wall of the filter box 3 is attached to the wall surface. At least one section of the pipeline 1 protrudes from the side of the wall located outdoors, so that the first air outlet 11 can be communicated with the outdoor air. The pipeline 1 can be further subdivided into a ventilation pipeline 12 and a pipeline fan section 13 communicated with the ventilation pipeline 12. The fan 2 is separately arranged in the pipeline fan section 13, so that the ventilation pipeline 12 does not need to be enlarged to accommodate the volume of the fan 2, and can be set as a barrel-shaped structure with a smaller diameter, reducing the grooving area on the wall.

[0057] To prevent external rainwater, fallen leaves, etc. from entering the inside of the pipeline 1 through the first air outlet 11 and causing blockage of the pipeline 1, as Figure 1 and Figure 2 shown, as an optional implementation manner, a semi-circular shielding cover 14 can also be added to the end of the pipeline 1 located outdoors, and the first opening 11 is formed below the shielding cover 14.

[0058] It should be noted that in this embodiment, there are no requirements for the shapes and sizes of the first air outlet 11 and the second air outlet 33. The first air outlet 11 and the second air outlet 33 can be regular shapes such as rectangular, oval, circular, triangular, etc. or other irregular shapes.

[0059] In addition, in this embodiment, there is no limitation on the specific material used for the sound-absorbing layer 7. For example, sound-absorbing cotton made of fiberglass or polyester fiber sound-absorbing cotton can be used. A cover plate 8 is further covered on the side of the sound-absorbing layer 7 facing away from the second cavity 32, and the sound-absorbing cotton can be bonded to the cover plate 8 with glue to form the sound-absorbing layer 7. In addition, an installation port is provided on one side of the second cavity 32 facing the sound-absorbing layer 7 to facilitate the installation of components such as the filter component 4 in the installation cavity of the filter box 3, and finally the installation port is closed by the cover plate 8.

[0060] Optionally, in addition to being arranged relative to the filter component 4, the sound-absorbing layer 7 can also be arranged on other side walls in the second cavity 32, thereby further improving the sound-absorbing effect of the sound-absorbing layer 7.

[0061] The ventilation device provided in this embodiment has a fan 2 arranged in the duct 1, a filter component 4 and a sound-absorbing layer 7 opposite to the filter component 4 arranged in the filter box 3. Under the action of the fan 2, air can flow from the outside to the inside of the room. First, it enters the duct 1 through the first air outlet 11, flows through the duct 1 and then enters the first cavity 31 of the filter box 3, and then passes through the filter component 4 and enters the second cavity 32. At this time, the air has been purified by the filter component 4; at the same time, the filter component 4 and the sound-absorbing layer 7 are not more than 50 millimeters apart, which can make the air entering the second cavity 32 impact the sound-absorbing layer 7 at a relatively high speed, so that the air can fully contact the sound-absorbing layer 7 to absorb noise. The second air outlet 32 and the connection port 15 are separated by a set distance, which can increase the contact time of the air with the sound-absorbing layer 7 to further improve the sound-absorbing effect. After the sound-absorbing layer absorbs the noise, the air enters the room through the second air outlet. While realizing the delivery of fresh air and noise reduction and elimination in the room, the design structure of the second cavity and the sound-absorbing layer is simple and not complex, and will not affect the ventilation and exhaust efficiency.

[0062] Furthermore, in order to avoid meaningless consumption of the filter component 4 during the exhaust process of the ventilation and purification device, in this embodiment, an air vent 5 allowing air to enter the first cavity 31 is provided on the peripheral wall structure of the first cavity 31, and a seal 6 is movably arranged relative to the air vent 5. The seal 6 closes the air vent 5 when the pressure in the first cavity 31 is greater than the external pressure, and moves away from the air vent 5 when it is less than the external pressure.

[0063] In specific implementation, an air vent 5 is provided on the peripheral wall structure of the first cavity 31 to connect the first cavity 31 with the room interior. A seal 6 is used to control the opening or closing of the air vent 5. When the fan rotates forward, the pressure in the first cavity 31 is greater than the indoor air pressure, and the seal 6 closes the air vent 5. When the fan rotates in reverse, the pressure in the first cavity 31 is less than the indoor air pressure, and the seal 6 opens the air vent 5. Thus, when the ventilation and purification device provides fresh air to the room, the air flow passes through the filter component 4 and is purified, ensuring the air quality of the indoor fresh air. When the ventilation and purification device exhausts air to the outside, the air bypasses the filter component 4 through the opened air vent 5 and directly flows into the first cavity 31, then flows from the first cavity 31 into the interior of the duct 1, and finally flows out through the first air outlet 11. The filter component 4 is not required during exhaust, avoiding meaningless consumption of the filter component 4, and thus effectively extending the service life of the filter component 4.

[0064] Specifically, in this embodiment, the seal 6 is a sealing film covering the air vent 5 on the inner side surface of the first cavity 31. The sealing film has a connecting end 61 connected to the peripheral wall structure, and an acting end 62 that moves relative to the connecting end 61 under the action of the pressure difference between the inside and outside of the first cavity 31. During the movement of the acting end 62, there is a sealing state where at least part of the edge fits against the outer periphery of the air vent 5, and a ventilation state where at least part of the edge does not fit against the outer periphery of the air vent 5. The sealing film operates entirely relying on the pressure difference, without the need to set up a circuit or connect other control devices for it. Its structure is simple and reliable, and it is easy to operate.

[0065] In specific implementation, the sealing film can be made of a plastic sheet with certain flexibility and strength. The connecting end 61 is a part of the sealing film and is fixedly installed on the peripheral wall structure of the first cavity 31 through glue or screws. The acting end 62 is the free part of the sealing film that is not fixed. When the fan 2 operates and changes the pressure difference between the inside and outside of the first cavity 31, the acting end 62 of the sealing film will move relative to the connecting end 61 from the direction of higher pressure to the direction of lower pressure. When the pressure in the first cavity 31 is higher than the external pressure, the acting end 62 has a tendency to move towards the room interior under the action of the internal pressure. After being blocked by the peripheral wall structure of the first cavity 31, it is fixed and fits against the outer periphery of the air vent 5, thus forming a sealing state as shown in Figure 3 ; when the pressure in the first cavity 31 is lower than the external pressure, the acting end 62 has a tendency to move towards the interior of the first cavity 31. At this time, since the sealing film is arranged on the inner side surface of the first cavity 31, the acting end 62 will not be blocked by the peripheral wall structure during the movement, and thus can smoothly move away from the air vent 5, making the air vent 5 in a ventilation state as shown in Figure 4 .

[0066] It should be noted that in this embodiment, there are no restrictions on the specific shapes of the ventilation port 5 and the sealing film, but it should be ensured that the sealing film can completely cover the surface of the ventilation port 5 in the sealed state. Specifically, the ventilation port 5 can be in regular shapes such as rectangular, circular, triangular, or other irregular shapes. Correspondingly, the sealing film can also be set in a similar shape.

[0067] In order to enable air to directly flow into the interior of the first cavity 31 through the ventilation port 5, the ventilation port 5 can be implemented in various different ways. Among them, as an optional implementation manner, in this embodiment, the ventilation port 5 can be provided on the side wall of the filter box 3 corresponding to the first cavity 31. At this time, the ventilation port 5 directly connects the indoor area and the first cavity 31. When the ventilation and purification device needs to exhaust air outward, indoor air can directly enter the first cavity 31 through the ventilation port 5, then enter the pipeline 1 from the first cavity 31, and flow to the outside through the first air outlet 11, completely bypassing the filter component 4, which can effectively extend the service life of the filter component 4.

[0068] As another optional implementation manner of the ventilation port 5, in this embodiment, the ventilation port 5 can also be provided on the filter component 4 and communicate with the first cavity 31 and the second cavity 32. When the ventilation and purification device is exhausting air outward, the ventilation port 5 is opened. The resistance of the air at the ventilation port 5 is much smaller than the resistance of passing through the filter component 4, so that most of the air passes through along the ventilation port 5 and enters the first cavity 31, and only a very small amount of air flows through the filter component 4. Similarly, it can effectively reduce the meaningless consumption of the filter component 4 and further extend the service life of the filter component 4.

[0069] It should be noted that there is no requirement for the number of ventilation ports 5 provided in this embodiment. Multiple ventilation ports 5 can be provided on the filter box 3; or, only one ventilation port 5 can be provided, as long as it can meet the ventilation and air exchange efficiency of the ventilation and purification device.

[0070] Furthermore, as Figure 5 shown, in this embodiment, the filter component 4 includes an outer frame and a filter net installed in the outer frame; ventilation ports 5 are formed at a set distance from the edge of the filter net to the frame, and the connecting end 61 is connected to the outer frame. The filter net is installed inside the filter box 3 through the frame. In addition to being provided between the filter net and the frame, the ventilation ports 5 can also be provided on the filter net. At this time, the connecting end 61 can be connected to the filter net.

[0071] Among them, the filter net can filter fine particles in the air, especially particles with a diameter less than or equal to 2.5 micrometers, that is, PM2.5, so as to ensure the quality of fresh indoor air and protect human health. It is especially suitable for places where people live and work, such as office buildings and bedrooms.

[0072] In addition, it can be understood that in addition to solid particulate matters such as smoke, dust, and carbon scattered in the air, air pollutants also include gaseous pollutants including carbon oxides and sulfur oxides. Depending on the actual application scenarios of the ventilation and purification device, the filtering component 4 can also adopt other forms besides the filter mesh. For example, the filtering component 4 can be an activated carbon filter mesh for filtering gaseous pollutants. The porous structure inside the activated carbon can effectively adsorb toxic and harmful gases in the atmosphere and also eliminate odors.

[0073] Optionally, the filtering component 4 described in this embodiment can adopt the form of a combined multi-layer filtering system to further improve the filtering effect. For example, the filtering component 4 can include a coarse filter mesh, a fine filter mesh, and activated carbon sequentially arranged inside the filter box 3. The coarser filter mesh preferentially filters dust particles with larger sizes, the fine filter mesh filters small-sized particulate matters, and finally the gaseous pollutants are absorbed by the activated carbon, which can further improve the purification ability of the ventilation and purification device.

[0074] Specifically, as a feasible implementation manner, in this embodiment, the ventilation port 5 is a rectangular port, and the connection end 61 is arranged at the edge of one side of the ventilation port 5. As Figure 2 shown, multiple rectangular ventilation ports 5 can be provided, and the multiple ventilation ports 5 are arranged side by side on the side wall of the filter box 3 to improve the exhaust efficiency of the ventilation and purification device; or, only one ventilation port 5 can be provided, as Figure 6 shown, the ventilation port 5 is in a long and narrow rectangular structure and is arranged between the filter mesh and the frame. It can be understood that only one ventilation port 5 can also be provided on the side wall of the filter box 3 as long as the exhaust efficiency of the ventilation port 5 can be satisfied. This embodiment does not limit this.

[0075] Furthermore, in order to improve the ventilation efficiency of the ventilation and purification device, in this embodiment, a plurality of second air vents 33 are evenly arranged around the filter box 3, and the sound-absorbing layer 7 is arranged parallel to the filtering component 4. The second air vents 33 can be arranged on all the side walls of the filter box 3 adjacent to the sound-absorbing layer 7. At this time, the filter box 3 can discharge air in all directions. Alternatively, the second air vents 33 can also be not provided on one or two side walls.

[0076] It should be noted that since the second air outlet 33 is arranged between the sound-absorbing layer 7 and the filter component 4, sufficient space needs to be reserved between the sound-absorbing layer 7 and the filter component 4 to ensure that the second opening 33 has sufficient width, preventing the second opening 33 from being too narrow, where air flowing through the narrow gap at high speed generates a shrill sound, which affects the user experience. Exemplarily, when the second air outlet 33 is evenly arranged around the filter box 3 and air exits from all four sides of the filter box 3, the distance between the outermost edge of the sound-absorbing layer 7 and the edge of the air outlet of the fan 2 should be at least 30 millimeters. When one side of the filter box 3 is sealed, on the other sides where the second air outlet 33 is arranged, the distance between the outermost edge of the sound-absorbing layer 7 and the edge of the air outlet of the fan 2 should be at least 30 millimeters.

[0077] Furthermore, as a feasible implementation manner, in this embodiment, the second air outlet 33 can be arranged only on one side wall of the filter box 3 corresponding to the position between the sound-absorbing layer 7 and the filter component 4. The sound-absorbing layer 7 is inclined with respect to the filter component 4, and the distance between the sound-absorbing layer 7 and the filter component 4 gradually increases along the direction close to the second air outlet 33.

[0078] The sound-absorbing layer 7 is arranged in an inclined manner with respect to the filter component 4. On the one hand, it is to meet the width requirement of the second air outlet 33 to avoid a shrill sound when the second air outlet 33 is too narrow. On the other hand, it is to make the sound-absorbing layer as close as possible to the filter component 4 on the premise of ensuring the width requirement of the second air outlet 33, thereby improving the sound-absorbing ability of the sound-absorbing layer 7.

[0079] Furthermore, in order to maintain the indoor temperature during the ventilation process, in this embodiment, as Figure 7 shown, a heat storage type heat exchanger 9 is arranged in the pipeline 1. Under natural conditions, the air temperature in the enclosed room is usually higher than that outdoors. By reversing the fan 2, the air with a higher temperature indoors is sucked into the ventilation and purification device. The air flows along the pipeline 1, and after flowing through the heat storage type heat exchanger 9, the heat is stored in the heat storage body therein. After a certain period of time, the fan 2 rotates forward, and the outdoor fresh air enters the interior of the pipeline 1 from the first air outlet 11. After flowing through the heat storage type heat exchanger, it exchanges heat with the heat storage body therein and then flows into the room carrying the heat, thus achieving both ventilation and heat recovery. The heat or energy recovery efficiency can be improved by increasing the area and volume of the heat storage body in the heat storage type heat exchanger 9 and the switching time of the forward and reverse rotation of the fan 2.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ventilation and purification device, characterized in that: The invention comprises a pipe with a fan disposed therein; one end of the pipe is connected to a filter box through a connection port, and the other end is provided with a first air outlet located outdoors; the filter box has an installation cavity connected to the pipe, a filter assembly is disposed in the installation cavity, and the filter assembly divides the installation cavity into a first cavity and a second cavity; the first cavity is connected to the pipe; A sound-absorbing layer is provided in the second cavity, opposite to the filter assembly. A second air outlet is provided on a side wall of the filter box corresponding to the side wall between the sound-absorbing layer and the filter assembly, communicating with the second cavity and located indoors. The distance between the sound-absorbing layer and the filter assembly is no more than 50 mm. The connecting port is eccentrically disposed with respect to the center of the filter box, and an outer edge of the connecting port is spaced a predetermined distance from the second air outlet along a direction parallel to a cross-section of the connecting port. The peripheral wall structure of the first cavity is provided with a vent allowing air to enter the first cavity, and a sealing member movably arranged relative to the vent; the sealing member closes the vent when the pressure in the first cavity is greater than the external pressure, and moves away from the vent when the pressure in the first cavity is less than the external pressure.

2. The ventilation and purification device according to claim 1, characterized in that: The sealing member is a sealing film covering the vent on the inner side surface of the first cavity, and the sealing film has a connecting end connected to the peripheral wall structure, and an active end that moves relative to the connecting end under the action of the pressure difference between the inside and outside of the first cavity. During the movement of the active end, the edge of the active end is in a sealed state that is in contact with the outer periphery of the vent, and at least part of the edge is not in contact with the outer periphery of the vent.

3. The ventilation and purification device according to claim 2, characterized in that: The vent is arranged on a side wall of the filter box corresponding to the first cavity.

4. The ventilation and purification device according to claim 2, characterized in that: The vent is provided on the filter assembly and communicates with the first cavity and the second cavity.

5. The ventilation and purification device according to claim 4, characterized in that: The filter assembly includes an outer frame and a filter screen installed on the outer frame; the edge of the filter screen is spaced a set distance from the outer frame to form the vent; and the connecting end is connected to the outer frame.

6. The ventilation and purification device according to claim 2, characterized in that: The vent is a rectangular opening, and the connecting end is arranged on a side edge of the vent.

7. The ventilation and purification device according to claim 1, characterized in that: A plurality of second air vents are evenly arranged around the filter box, and the sound absorbing layer is arranged parallel to the filter assembly.

8. The ventilation and purification device according to claim 1, characterized in that: The second air outlet is only arranged on one side wall of the filter box corresponding to the sound absorbing layer and the filter assembly. The sound absorbing layer is arranged obliquely relative to the filter assembly, and the distance between the sound absorbing layer and the filter assembly gradually increases along the direction approaching the second air outlet.

9. The ventilation and purification device according to claim 1, characterized in that: A heat storage type heat exchanger is arranged in the pipeline.

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