Check valve and range hood
By using the outer cylinder gradient cavity in the hood combined with the inner cylinder micro-perforated plate, effective noise reduction of medium and low frequency noise at lower thickness is achieved, and traditional sound-absorbing cotton is solved under limited thickness The problem of difficulty in controlling the noise of the hood significantly improves the noise control effect.
Patent Information
- Application Number
- CN202420537348.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-03-19
AI Technical Summary
Traditional sound-absorbing cotton is difficult to effectively control the medium and low frequency noise of the hood under limited thickness, and the prior art is difficult to achieve effective noise reduction of the hood noise.
Design a check valve, using a cavity formed by the gradient of the outer cylinder and a micro-perforated plate of the inner cylinder, to reduce the airflow through the sound-silence device to realize wide-band noise control, ensuring that the sound-absorbing cotton is matched at a lower thickness. Medium and low frequency noise achieves better noise reduction effect.
Through the design of the check valve, the noise reduction effect of sound-absorbing cotton on medium and low frequency noise can be significantly improved at lower thickness, solving the problem that traditional technology is difficult to control medium and low frequency noise in hood under limited thickness, achieving better Noise control effect.
Smart Images
Figure CN222229643U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of range hoods, in particular to a check valve and a range hood. Background Art
[0002] For range hood noise reduction, the most commonly used technical solution is sound-absorbing cotton. For sound-absorbing cotton, the main principle of noise reduction is thermal viscous dissipation.
[0003] The disadvantage of sound-absorbing cotton in noise control is that it is difficult to effectively control the low- and medium-frequency noise of the range hood with limited thickness (generally speaking, low frequency refers to noise below 300Hz, medium frequency refers to noise in the range of 300-1000Hz, and high frequency refers to noise above 1000Hz). The sound absorption coefficient of 20mm thick sound-absorbing cotton is less than 0.4 below 1000Hz, and the sound absorption effect is very poor. The main noise of the range hood is in the low- and medium-frequency. For sound, its wavelength is inversely proportional to the frequency (wavelength = sound speed / frequency). Therefore, the lower the frequency, the longer the wavelength, and the less concentrated the energy, which means that thicker sound-absorbing cotton is needed to control it. Therefore, the sound-absorbing cotton of limited thickness is not effective in controlling the noise of the range hood. Utility Model Content
[0004] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model proposes a check valve, which can achieve a wide-band noise control effect based on the cavity formed by the gradual change of the outer cylinder and the design of the micro-perforated plate of the inner cylinder. Moreover, when the check valve constructed by setting a silencer is applied to a range hood, it can ensure that the sound-absorbing cotton can achieve a better noise reduction effect on medium and low frequency noise at a lower thickness, solving the technical problem that traditional noise reduction technology is difficult to control the medium and low frequency noise of the range hood under the limited thickness of the sound-absorbing cotton.
[0005] The utility model also provides a range hood.
[0006] The check valve according to the first embodiment of the utility model comprises:
[0007] A silencer device, the silencer device comprising an inner cylinder and an outer cylinder, the cylinder wall of the inner cylinder being provided with a microporous portion, the two ends of the inner cylinder being provided with an air inlet and an air outlet respectively, the outer cylinder being sleeved on the outer side of the inner cylinder, the two ends of the outer cylinder being sealed and connected with the inner cylinder to enclose a cavity connected with the microporous portion, and the cross-sectional area of the cavity gradually decreases from the air inlet to the air outlet;
[0008] A valve body is disposed at at least one of the air inlet and the air outlet.
[0009] The check valve provided by the utility model is suitable for installation on an airflow channel, and a silencer is arranged on the valve body to reduce noise and mute the airflow passing through. The silencer mainly includes an inner cylinder and an outer cylinder. The two ends of the inner cylinder on the axial direction are respectively an air inlet and an air outlet. The airflow enters the inner side of the inner cylinder from the air inlet and is then discharged from the air outlet. A microporous portion is arranged on the cylinder wall of the inner cylinder. The outer cylinder surrounds the outer side of the inner cylinder to form a cavity with the inner cylinder. The microporous portion is connected to the cavity. When the airflow passes through the inner cylinder, sound waves can pass through the microporous portion. Since the microporous portion of the inner cylinder is formed into a microperforated plate, the sound reduction effect can be initially achieved. Then the sound wave enters the cavity between the inner cylinder and the outer cylinder. Since the cross-sectional area of the cavity gradually decreases along the airflow direction, the wavelength compression of the incoming sound wave can be achieved, that is, the wavelength is shortened, and noise reduction is achieved for medium and low frequency sound waves.
[0010] The design of the cavity formed by the gradual change of the outer cylinder and the micro-perforated plate of the inner cylinder can achieve a wide-band noise control effect. Moreover, when the check valve constructed by setting a silencer is applied to the range hood, it can ensure that the sound-absorbing cotton can achieve better noise reduction effect on medium and low frequency noise at a lower thickness, which solves the technical problem that traditional noise reduction technology is difficult to control the medium and low frequency noise of the range hood with limited thickness of sound-absorbing cotton.
[0011] According to an embodiment of the utility model, at least one partition is provided in the cavity, the inner edge of the partition is connected to the inner cylinder, and the outer edge of the partition is connected to the outer cylinder, so as to divide the cavity into a plurality of muffler chambers.
[0012] According to an embodiment of the present invention, the plurality of partitions are evenly arranged along the direction from the air inlet to the air outlet, and the plurality of partitions are arranged parallel to each other.
[0013] According to an embodiment of the utility model, the cylinder wall of the inner cylinder is provided with a plurality of the microporous portions, the microporous portions are arranged one-to-one corresponding to the muffler chambers, each of the microporous portions includes a plurality of microporous groups, and the plurality of microporous groups are evenly distributed along the circumference of the inner cylinder.
[0014] According to an embodiment of the present invention, each of the micropore groups includes a plurality of micropores, and the plurality of micropores are evenly distributed along a direction from the air inlet to the air outlet.
[0015] According to an embodiment of the present invention, the cross-sectional area of the inner cylinder gradually increases from the air inlet to the air outlet.
[0016] According to an embodiment of the utility model, the outer cylinder is closedly connected to the air inlet of the inner cylinder through a bottom plate, the bottom plate is provided with a mounting hole, the outer cylinder is provided with a through hole, and the through hole is connected to the mounting hole through a connecting pipe.
[0017] According to an embodiment of the utility model, the bottom plate is provided with an anti-slip portion on a side facing away from the air outlet.
[0018] According to an embodiment of the utility model, the outer cylinder is provided with an extension portion, the extension portion is arranged around the outer side of the air outlet, and there is a gap between the extension portion and the inner cylinder.
[0019] The range hood according to the second embodiment of the utility model comprises:
[0020] A range hood body, wherein the range hood body is provided with a fan volute;
[0021] In the check valve as described above, the air inlet is communicated with the fan volute.
[0022] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:
[0023] The check valve of the embodiment of the utility model is suitable for installation on the air flow channel, and a silencer is arranged on the valve body to reduce the noise and mute the air flow passing through. The silencer mainly includes an inner cylinder and an outer cylinder. The two ends of the inner cylinder on the axial direction are respectively an air inlet and an air outlet. The air flow enters the inner side of the inner cylinder from the air inlet and is then discharged from the air outlet. The cylinder wall of the inner cylinder is provided with a microporous portion. The outer cylinder surrounds the outer side of the inner cylinder to form a cavity between the inner cylinder and the inner cylinder. The microporous portion is connected to the cavity. When the air flow passes through the inner cylinder, the sound waves can pass through the microporous portion. Since the microporous portion of the inner cylinder is formed into a microperforated plate, the sound reduction effect can be initially achieved. Then the sound wave enters the cavity between the inner cylinder and the outer cylinder. Since the cross-sectional area of the cavity gradually decreases along the air flow direction, the wavelength compression of the incoming sound wave can be achieved, that is, the wavelength is shortened, and the noise reduction of the medium and low frequency sound waves can be achieved.
[0024] The design of the cavity formed by the gradual change of the outer cylinder and the micro-perforated plate of the inner cylinder can achieve a wide-band noise control effect. Moreover, when the check valve constructed by setting a silencer is applied to the range hood, it can ensure that the sound-absorbing cotton can achieve better noise reduction effect on medium and low frequency noise at a lower thickness, which solves the technical problem that traditional noise reduction technology is difficult to control the medium and low frequency noise of the range hood with limited thickness of sound-absorbing cotton.
[0025] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 It is a structural schematic diagram of a muffler device for a check valve provided in an embodiment of the utility model;
[0028] Figure 2 It is a top view of the silencer device of the check valve provided by the embodiment of the utility model;
[0029] Figure 3 yes Figure 2 AA section view;
[0030] Figure 4 yes Figure 2 BB cross-section diagram;
[0031] Figure 5 It is a top view of the structure of the range hood provided by the embodiment of the utility model.
[0032] Reference numerals:
[0033] 100, silencer; 110, inner cylinder; 111, air inlet; 112, air outlet; 120, outer cylinder; 121, through hole; 122, connecting pipe; 123, extension; 124, groove; 130, microporous portion; 131, microporous group; 132, microporous; 140, cavity; 141, silencer cavity; 142, partition; 150, bottom plate; 151, mounting hole; 152, anti-slip portion;
[0034] 200. Range hood body. DETAILED DESCRIPTION
[0035] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.
[0036] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0037] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.
[0038] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the check valve provided by the embodiment of the utility model includes a silencer 100 and a valve body, the silencer 100 includes an inner cylinder 110 and an outer cylinder 120, the cylinder wall of the inner cylinder 110 is provided with a microporous portion 130, and the two ends of the inner cylinder 110 are respectively provided with an air inlet 111 and an air outlet 112, the outer cylinder 120 is sleeved on the outside of the inner cylinder 110, and the two ends of the outer cylinder 120 are closed and connected with the inner cylinder 110 to enclose a cavity 140 connected with the microporous portion 130, and the cross-sectional area of the cavity 140 gradually decreases from the air inlet 111 to the air outlet 112; the valve body is arranged at least one of the air inlet 111 and the air outlet 112.
[0041] The check valve of the embodiment of the utility model is suitable for installation on an air flow channel. A silencer 100 is arranged on the valve body to reduce noise and mute the air flow passing through. The silencer 100 mainly includes an inner cylinder 110 and an outer cylinder 120. The two ends of the inner cylinder 110 in the axial direction are an air inlet 111 and an air outlet 112, respectively. The air flow enters the inner side of the inner cylinder 110 from the air inlet 111 and is then discharged from the air outlet 112. The wall of the inner cylinder 110 is provided with a microporous portion 130. The outer cylinder 120 surrounds the outer side of the inner cylinder 110 to form a cavity 140 with the inner cylinder 110. The microporous portion 130 and the cavity 140 are formed between the outer cylinder 120 and the inner cylinder 110. 40 is connected, when the airflow passes through the inner cylinder 110, the sound waves can pass through the microporous portion 130. Since the microporous portion 130 of the inner cylinder 110 forms a micro-perforated plate, the sound attenuation and noise reduction effect can be initially achieved, and then the sound waves enter the cavity 140 between the inner cylinder 110 and the outer cylinder 120. Since the cross-sectional area of the cavity 140 gradually decreases along the airflow direction, the wavelength of the incoming sound waves can be compressed, that is, the wavelength can be shortened, and noise reduction can be achieved for medium and low frequency sound waves.
[0042] Based on the cavity 140 formed by the gradual change of the outer cylinder 120 and the design of the micro-perforated plate of the inner cylinder 110, a wide-band noise control effect can be achieved. Moreover, when the check valve constructed by setting the silencer 100 is applied to the range hood, it can ensure that the sound-absorbing cotton can achieve better noise reduction effect on medium and low frequency noise at a lower thickness, thereby solving the technical problem that traditional noise reduction technology is difficult to control the medium and low frequency noise of the range hood with limited thickness of sound-absorbing cotton.
[0043] In this embodiment, the valve body includes a leaf door that can be opened and closed in one direction. When the fan of the range hood is started, that is, the range hood is in the smoking mode, the leaf door opens and the airflow passes through the valve body. When the fan of the range hood stops, that is, the range hood is in the standby or off mode, the leaf door automatically closes, and the airflow discharged by the leaf door cannot return to the range hood, thereby achieving a non-return effect. The valve body can be arranged at the air inlet 111 or the air outlet 112 of the inner cylinder 110, and both can achieve a noise-reducing and silent smoke exhaust effect.
[0044] According to one embodiment of the utility model, at least one partition 142 is provided in the cavity 140 , the inner edge of the partition 142 is connected to the inner cylinder 110 , and the outer edge of the partition 142 is connected to the outer cylinder 120 , so as to divide the cavity 140 into a plurality of muffler chambers 141 . In this embodiment, a partition 142 is arranged between the outer cylinder 120 and the inner cylinder 110. The partition 142 is arranged horizontally and has a ring shape, that is, the ring-shaped partition 142 surrounds the inner cylinder 110 and divides the cavity 140 into a plurality of silencer chambers 141. The microporous portion 130 on the inner cylinder 110 can be connected to the silencer chamber 141, that is, in the process of air flow passing through the inner cylinder 110, the sound waves can enter the different silencer chambers 141 separated by the partition 142 along their transmission direction. Since the outer cylinder 120 is a gradient structure, the silencer chamber 141 separated by the partition 142 is also a gradient design, thereby achieving wavelength compression to reduce noise and mute the medium and low frequencies of the sound waves.
[0045] In this embodiment, the inner edge of the partition 142 is sealed to the outer wall of the inner cylinder 110, and the outer edge of the partition 142 is sealed to the inner wall of the outer cylinder 120 to ensure that each muffler chamber 141 is isolated and independent from each other within the range between the inner cylinder 110 and the outer cylinder 120.
[0046] According to an embodiment of the utility model, a plurality of baffles 142 are evenly arranged along the direction from the air inlet 111 to the air outlet 112, and the plurality of baffles 142 are arranged parallel to each other. In this embodiment, a plurality of baffles 142 are arranged in the cavity 140, and the baffles 142 are arranged parallel to each other. In the direction of air flow, the plurality of baffles 142 are evenly distributed, that is, the spacing distances between adjacent baffles 142 are the same, and the entire cavity 140 is divided into multiple layers of silencing cavities 141 in the direction of sound wave transmission. As the number of baffles 142 increases, the number of silencing cavities 141 formed by the separation of the cavity 140 in the direction of sound wave propagation also increases, which can further enhance the noise reduction and silencing effect.
[0047] In other embodiments, the number of partitions 142 and the distance between adjacent partitions 142 can be set according to actual needs.
[0048] According to an embodiment of the utility model, the cylinder wall of the inner cylinder 110 is provided with a plurality of microporous portions 130, and the microporous portions 130 are arranged in a one-to-one correspondence with the muffler cavity 141, and each microporous portion 130 includes a plurality of microporous groups 131, and the plurality of microporous groups 131 are evenly distributed along the circumference of the inner cylinder 110. In this embodiment, there are a plurality of microporous portions 130 on the inner cylinder 110, and each microporous portion 130 has its own independently corresponding muffler cavity 141, and the sound waves enter the corresponding muffler cavity 141 through the microporous portions 130. That is, the microporous portions 130 on the inner cylinder 110 are arranged in layers along the direction of sound wave propagation, and in order to ensure that the sound waves enter the muffler cavity 141 sufficiently evenly, each layer of the microporous portions 130 is provided with a plurality of microporous groups 131, and the plurality of microporous groups 131 are evenly distributed around the inner cylinder 110.
[0049] In this embodiment, each layer of microporous portion 130 includes an equal number of microporous groups 131, and the number of micropores 132 in each microporous group 131 is also equal, thereby ensuring that the microporous portion 130 is evenly distributed on the inner cylinder 110. In other embodiments, the number of microporous groups 131 in a microporous portion 130 and the distance between adjacent microporous groups 131 can be set according to actual needs.
[0050] According to an embodiment of the present invention, each micropore group 131 includes a plurality of micropores 132, and the plurality of micropores 132 are evenly distributed along the direction from the air inlet 111 to the air outlet 112. In this embodiment, each micropore group 131 is composed of a plurality of micropores 132, and the plurality of micropores 132 are arranged along the direction of sound wave propagation, that is, the arrangement range of the plurality of micropores 132 corresponds to the height range of the muffler cavity 141, and the distances between adjacent micropores 132 within this range are the same.
[0051] In this embodiment, the diameter of the micropores 132 , the number of micropores 132 in a micropore group 131 , that is, the perforation rate of the inner cylinder 110 , and the distance between adjacent micropores 132 can be set according to actual needs.
[0052] According to an embodiment of the utility model, the cross-sectional area of the inner cylinder 110 gradually increases from the air inlet 111 to the air outlet 112. In this embodiment, the cross-sectional area of the inner cylinder 110 gradually increases along the airflow propagation direction, that is, the inner cylinder 110 is also a gradual structure. Compared with the inner cylinder 110 with a consistent cross-sectional area, the inner cylinder 110 with a gradually changing inner diameter designed by the utility model, in conjunction with the outer cylinder 120 with a gradually decreasing cross-sectional area along the airflow propagation direction, can make the cross-sectional area of the cavity 140 change more obviously, and can also further increase the volume of the muffler cavity 141 corresponding to the air inlet 111, thereby making the muffler frequency of the muffler cavity 141 lower.
[0053] According to an embodiment of the utility model, the outer cylinder 120 is closed and connected with the air inlet 111 of the inner cylinder 110 through the bottom plate 150, the bottom plate 150 is provided with a mounting hole 151, and the outer cylinder 120 is provided with a through hole 121, and the through hole 121 is connected with the mounting hole 151 through a connecting pipe 122. In this embodiment, the outer cylinder 120 is closed and connected with the air inlet 111 through the bottom plate 150 on the side close to the air inlet 111, that is, the end of the outer cylinder 120 is flush with the air inlet 111 and connected through the bottom plate 150, so that the outer cylinder 120, the bottom plate 150 and the inner cylinder 110 enclose a cavity 140. The bottom plate 150 is provided with a mounting hole 151 so that the check valve can be connected to the equipment to be installed by fasteners such as bolts. The outer cylinder 120 is provided with a through hole 121, and the connecting pipe 122 connects the through hole 121 and the mounting hole 151, that is, the two ends of the connecting pipe 122 are respectively connected to the outer cylinder 120 and the bottom plate 150, and the connecting position between the through hole 121 and the mounting hole 151 is isolated from the cavity 140.
[0054] When the check valve is installed on the range hood, the bottom plate 150 can be brought into contact with the range hood, and the bolts enter the connecting pipe 122 through the through holes 121 , and after reaching the mounting holes 151 , they are connected to the range hood at the mounting holes 151 .
[0055] According to an embodiment of the present invention, the bottom plate 150 is provided with an anti-slip portion 152 on the side facing away from the air outlet 112. In this embodiment, the anti-slip portion 152 is a baffle plate staggered horizontally and vertically, and has a certain height. On the one hand, it can increase the friction between the bottom plate 150 of the check valve and the equipment to be installed to avoid displacement and misalignment during the installation and use of the check valve, and on the other hand, it can also reduce the vibration transmitted to the check valve by the equipment to be installed.
[0056] According to an embodiment of the utility model, the outer cylinder 120 is provided with an extension portion 123, and the extension portion 123 is arranged around the outer side of the gas outlet 112, and there is a gap between the extension portion 123 and the inner cylinder 110. In this embodiment, the extension portion 123 is arranged at one end of the outer cylinder 120 close to the gas outlet 112 of the inner cylinder 110, and the extension portion 123 is an annular plate body, which is arranged around the outer side of the gas outlet 112, that is, a certain range is limited on the outer side of the gas outlet 112, and the inner wall of the extension portion 123 and the outer wall of the inner cylinder 110 are arranged to form an annular groove 124, which can be used to connect with other equipment connected to the gas outlet 112, such as exhaust structures such as pipes.
[0057] The range hood provided by the present invention is described below. The range hood described below and the check valve described above can be referenced to each other.
[0058] The embodiment of the utility model further provides a range hood, comprising a range hood body 200 and a check valve as in the above embodiment, wherein the range hood body 200 is provided with a fan volute; and the air inlet 111 is connected to the fan volute.
[0059] In the range hood of the embodiment of the utility model, since the noise of the range hood is mainly generated near the volute tongue of the fan, and the check valve is close to the volute tongue, the check valve is set on the volute tongue of the fan to achieve a better noise reduction effect. The cavity 140 formed by the gradual change of the outer cylinder 120 combined with the design of the micro-perforated plate of the inner cylinder 110 can achieve a wide-band noise control effect, and when the check valve constructed by setting the silencer 100 is applied to the range hood, it can ensure that the sound-absorbing cotton can achieve a better noise reduction effect on the low- and medium-frequency noise at a lower thickness, solving the technical problem that the traditional noise reduction technology is difficult to control the low- and medium-frequency noise of the range hood under the limited thickness of the sound-absorbing cotton.
[0060] In this embodiment, the outer cylinder 120 is designed to have a larger portion located on the left side of the inner cylinder 110 and a smaller portion located on the right side of the inner cylinder 110. The right side portion is designed to adapt to the size of the range hood body 200 to prevent the silencer 100 from protruding from the outside of the range hood body 200. The left side has a larger space, so the volume of the silencer 100 can be increased, but it is necessary to avoid affecting the installation of the control line of the left circuit board.
[0061] In other embodiments, the larger the cavity 140 between the outer cylinder 120 and the inner cylinder 110, the lower the frequency that the silencer can eliminate, so the shape of the outer cylinder 120 can be adjusted according to actual needs, and the shape of the inner cylinder 110 can also be adjusted if appropriate to match the outer cylinder 120 to form the required size of the cavity 140.
[0062] In this embodiment, the muffler 100 is arranged vertically, and the outer cylinder 120 is a conical structure formed by splicing multiple plates with a large lower end and a small upper end, which is easy to process and manufacture. The inner cylinder 110 is a cylindrical structure with a small lower end and a large upper end, and the inner cylinder 110 is an integrally formed structure. In other embodiments, the outer cylinder 120 can also be an integrally formed conical structure, which is conducive to the sealing effect of the enclosed cavity.
[0063] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.
Claims
1. A check valve, characterized in that: include: A silencer device, the silencer device comprising an inner cylinder and an outer cylinder, the cylinder wall of the inner cylinder being provided with a microporous portion, the two ends of the inner cylinder being provided with an air inlet and an air outlet respectively, the outer cylinder being sleeved on the outer side of the inner cylinder, the two ends of the outer cylinder being sealed and connected with the inner cylinder to enclose a cavity connected with the microporous portion, and the cross-sectional area of the cavity gradually decreases from the air inlet to the air outlet; A valve body is disposed at at least one of the air inlet and the air outlet.
2. The check valve according to claim 1, characterized in that: At least one partition is arranged in the cavity, the inner edge of the partition is connected to the inner cylinder, and the outer edge of the partition is connected to the outer cylinder, so as to divide the cavity into a plurality of muffler chambers.
3. The check valve according to claim 2, characterized in that: The plurality of partitions are evenly arranged along the direction from the air inlet to the air outlet, and the plurality of partitions are arranged parallel to each other.
4. The check valve according to claim 2, characterized in that: The cylinder wall of the inner cylinder is provided with a plurality of micro-hole portions, the micro-hole portions are arranged in one-to-one correspondence with the muffler chambers, each of the micro-hole portions includes a plurality of micro-hole groups, and the plurality of micro-hole groups are evenly distributed along the circumference of the inner cylinder.
5. The check valve according to claim 4, characterized in that: Each of the micropore groups includes a plurality of micropores, and the plurality of micropores are evenly distributed along a direction from the air inlet to the air outlet.
6. The check valve according to any one of claims 1 to 5, characterized in that: The cross-sectional area of the inner cylinder gradually increases from the air inlet to the air outlet.
7. The check valve according to any one of claims 1 to 5, characterized in that: The outer cylinder is closedly connected to the air inlet of the inner cylinder through a bottom plate, the bottom plate is provided with a mounting hole, and the outer cylinder is provided with a through hole, and the through hole is connected to the mounting hole through a connecting pipe.
8. The check valve according to claim 7, characterized in that: The bottom plate is provided with an anti-slip portion on a side facing away from the air outlet.
9. The check valve according to any one of claims 1 to 5, characterized in that: The outer cylinder is provided with an extension portion, the extension portion is arranged around the outer side of the air outlet, and a gap is formed between the extension portion and the inner cylinder.
10. A range hood, characterized in that: include: A range hood body, wherein the range hood body is provided with a fan volute; The check valve according to any one of claims 1 to 9, wherein the air inlet is connected to the fan volute.