Rectification and noise reduction air pipe and air purification device

Abstract

The utility model relates to a rectification noise reduction air duct and air purification plant, rectification noise reduction air duct includes rectification box, rectification net, first pipe section, second pipe section, wavelength pipe and air valve, wherein the rectification net is provided in the cavity of rectification box, makes the airflow that the velocity distribution is uneven form the airflow that the section velocity distribution is even through diffusion, rectification, converge, forms the airflow that the cross section velocity distribution is even, and the air valve is arranged in the cavity of rectification box. The arrangement and monitoring of the tester are facilitated, the tested data are more stable and reliable, and an important guarantee is provided for the accurate distribution and control of the air volume of the air pipe. Secondly, a quarter-wavelength tube is arranged in the second tube section, the tail end of the wavelength tube is sealed, and when sound waves enter the quarter-wavelength tube after being rectified from the rectifier box, the sound waves corresponding to the frequency are reflected back into the rectifier box by the sealed end of the wavelength tube; and the wavelengths corresponding to the passing frequency of the rectifier box are mutually counteracted due to opposite phases, so that the aim of silencing is fulfilled.

Description

Technical Field

[0001] The utility model relates to the field of air purification, in particular to a rectifying and noise-reducing air duct and an air purification device. Background Art

[0002] The air duct is connected to the fan outlet. When the fan rotor rotates, the airflow pressure and airflow velocity along the circumferential direction at the outlet of the blade channel on the impeller are unevenly distributed, which acts on the volute to form periodic pressure pulsations; the periodic action of the airflow on the volute tongue forms unsteady pressure pulsations on its surface. Both cases will produce obvious peak noise at the passing frequency, and the peak noise at the passing frequency is the most prominent. During the rotation of the impeller, the blades interact with the gas, and the airflow flows through the blade interface to produce turbulent boundary layers and vortices. The splitting and separation of the vortices causes the pulsation of pressure on the blades, radiating an unstable broadband noise; both discrete noise and broadband noise will be transmitted into the air duct through the fan outlet, resulting in high noise in the air duct and the air outlet at the end of the air duct. Utility Model Content

[0003] In view of the above problems, the utility model provides a rectifying and noise-reducing air duct and an air purification device, which solve the problem of high noise caused by pipeline layout problems in existing air ducts.

[0004] To achieve the above-mentioned objectives, in a first aspect, the present application provides a rectifying and noise-reducing air duct, comprising a rectifying box, a rectifying net, a first pipe section, a second pipe section, a wavelength tube and an air valve, wherein the rectifying box has a first outlet and a first inlet arranged opposite to each other, and the rectifying box has a cavity; the rectifying net is arranged along the radial direction of the cavity, and the rectifying net divides the cavity into a first cavity and a second cavity; the first pipe section is connected to the first inlet; the second pipe section is connected to the first outlet, and the second pipe section is connected to an indoor air supply port; the wavelength tube is arranged on the side wall of the second pipe section, the wavelength tube is connected to the second pipe section, the wavelength tube is a quarter-wavelength tube, and the end of the wavelength tube is closed; the air valve is arranged on the first pipe section, and the other end of the first pipe section is connected to the air outlet of the fan.

[0005] In some embodiments, the radial dimension of the cavity gradually increases along the wind direction according to a first preset gradient to a first preset dimension, and then gradually decreases along the wind direction according to a second preset gradient to a second preset dimension; the rectifier network is arranged at the radial interface where the radial dimension of the cavity is the first preset dimension.

[0006] In some embodiments, the inner wall of the fairing box is also attached with wave crest cotton, which is used to absorb noise.

[0007] In some embodiments, it also includes a thermal anemometer and a control unit. The thermal anemometer is arranged on the side wall of the second pipe section; the control unit is electrically connected to the thermal anemometer.

[0008] In the second aspect, the present application also provides an air purification device, including an air-conditioning unit, a fan and a rectifying and noise reduction air duct, the air-conditioning unit includes a shell, the shell has a accommodating chamber, a first input port and a first output port, the first input port and the first output port are respectively connected to the accommodating chamber, and the first input port and the first output port are arranged opposite to each other; the fan is arranged at the first output port; the rectifying and noise reduction air duct is connected to the first output port, and the rectifying and noise reduction air duct is the rectifying and noise reduction air duct described in the first aspect.

[0009] In some embodiments, a connecting pipe is further included, one end of the connecting pipe is connected to the first output port, and the other end of the connecting pipe is connected to the first pipe section.

[0010] In some embodiments, the extending trend of the connecting pipeline is L-shaped, U-shaped or Z-shaped.

[0011] In some embodiments, the air conditioning unit also includes a filter component, a temperature control component and a humidification component. The filter component is arranged in the accommodating cavity, and the filter component divides the accommodating cavity into an unfiltered cavity and a filtered cavity; the temperature control component is arranged in the filtered cavity; the humidification component is arranged in the filtered cavity and is arranged between the temperature control component and the first output port.

[0012] In some embodiments, the filter assembly includes a first filter module, a second filter module and a third filter module. The first filter module, the second filter module and the third filter module are spaced apart in sequence from the first input port to the first output port. The first filter module is a primary filter, the second filter module is a charging module, and the third filter module is a dust collection module. The first filter module is used to filter out large-sized particles, the second filter module is used to release charges to small-sized particles remaining in the filtered air, and the third filter module is used to adsorb small-sized particles with charges.

[0013] In some embodiments, the temperature control component includes a first heat conducting tube and a second heat conducting tube, and the first heat conducting tube and the second heat conducting tube are sequentially arranged in the filtered cavity from the first input port to the first output port, and the thermal conductivity temperature of the first heat conducting tube does not overlap with the thermal conductivity temperature of the second heat conducting tube; and / or, the humidification component includes a water storage tank and a humidification pipeline, the water storage tank is connected to the humidification pipeline, the humidification pipeline passes through the shell and is placed in the filtered cavity, and a humidification nozzle is provided at the end of the humidification pipeline.

[0014] Different from the prior art, in the above technical solution, the rectifier noise reduction air duct includes a rectifier box, a rectifier net, a first pipe section, a second pipe section, a wavelength tube and an air valve, wherein the rectifier net is arranged in the cavity of the rectifier box, so that the airflow with uneven velocity distribution undergoes expansion, rectification and convergence to form an airflow with uniform cross-sectional velocity distribution, which is not only conducive to the arrangement and monitoring of the tester, but also makes the test data more stable and reliable, and plays an important role in the precise distribution and control of the air volume of the air duct. Secondly, a quarter-wavelength tube is arranged in the second pipe section, and the end of the second pipe section is sealed. When the sound wave enters the quarter-wavelength tube after being rectified from the rectifier box, the sound wave corresponding to the passing frequency is reflected back into the rectifier box by the closed end of the second pipe section, and the wavelength corresponding to the passing frequency of the rectifier box cancels each other due to the opposite phase, thereby achieving the purpose of silencing.

[0015] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the utility model. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the utility model, and then implement it according to the text of the specification and the contents recorded in the drawings, and in order to make the above-mentioned purpose and other purposes, features and advantages of the utility model easier to understand, the specific implementation method and drawings of the utility model are explained below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present invention and other related contents, and shall not be considered as limitations of the present invention.

[0017] In the drawings of the specification:

[0018] Figure 1 It is a first schematic diagram of the rectifying and noise reducing air duct according to the specific implementation method;

[0019] Figure 2 A second schematic diagram of the rectifying and noise-reducing air duct according to the specific implementation method;

[0020] Figure 3 It is a schematic diagram of the air purification device described in the specific implementation method;

[0021] Figure 4 is a schematic diagram of an air conditioning unit according to a specific implementation method;

[0022] Figure 5 for Figure 4 A first partial enlarged view of;

[0023] Figure 6 for Figure 4 The second partial enlargement of .

[0024] The reference numerals in the above drawings are described as follows:

[0025] 1. Rectification and noise reduction air duct;

[0026] 11. Rectifier box;

[0027] 12. Rectification network;

[0028] 13. The first pipe section;

[0029] 14. The second pipe section;

[0030] 15. Wavelength tube;

[0031] 16. Air valve;

[0032] 17. Thermal anemometer;

[0033] 2. Air conditioning unit;

[0034] 21. Shell;

[0035] 211, unfiltered cavity;

[0036] 212, filtered cavity;

[0037] 22. Filter component;

[0038] 221. A first filtering module;

[0039] 222, second filtering module;

[0040] 223. The third filtering module;

[0041] 23. Temperature control components;

[0042] 231, a first heat conducting pipe;

[0043] 232, a second heat conducting pipe;

[0044] 24. Humidification component;

[0045] 241. Water storage tank;

[0046] 242. Humidification pipeline;

[0047] 3. Fan;

[0048] 4. Connect the pipelines. DETAILED DESCRIPTION

[0049] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purposes and effects that can be achieved of the present invention, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention.

[0050] Reference to "embodiment" in this document means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The word "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present invention, as long as there is no technical contradiction or conflict, the various technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0051] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which the present invention belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit the present invention.

[0052] In the description of the present invention, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in a logical relationship of "or".

[0053] In the present invention, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0054] Without further restrictions, in the present invention, the words "include", "comprises", "has" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0055] Similar to the understanding in the Examination Guidelines, in the present invention, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of the present invention, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0056] In the description of the embodiments of the present invention, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present invention or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0057] Unless otherwise expressly specified or limited, in the description of the embodiments of the present utility model, the terms "install", "connect", "connect", "fix", "set" and the like used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the technical field of the present utility model, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0058] See also Figure 1 and Figure 2 In the first aspect, the present embodiment provides a rectifying and noise reduction air duct 1, comprising a rectifying box 11, a rectifying net 12, a first pipe section 13, a second pipe section 14, a wavelength tube 15 and an air valve 16, the rectifying box 11 has a first outlet and a first inlet which are arranged opposite to each other, and the rectifying box 11 has a cavity; the rectifying net 12 is arranged along the radial direction of the cavity, and the rectifying net 12 divides the cavity into a first cavity and a second cavity; the first pipe section 13 is connected to the first inlet; the second pipe section 14 is connected to the first outlet, and the second pipe section 14 is connected to the indoor air supply port; the wavelength tube 15 is arranged on the side wall of the second pipe section 14, the wavelength tube 15 is connected to the second pipe section 14, the wavelength tube 15 is a quarter-wavelength tube, and the end of the wavelength tube 15 is closed; the air valve 16 is arranged on the first pipe section 13, and the other end of the first pipe section 13 is connected to the air outlet of the fan 3.

[0059] The rectifying box 11 shown in this embodiment can be understood as a thin-walled structure with an internal hollow structure, and the specific shape can be set according to actual needs. The rectifying box 11 has a cavity inside, and the rectifying net 12 is arranged in the cavity and arranged along the radial direction of the cavity, that is, the rectifying net 12 is adapted to the radial cross-section of the cavity, and the rectifying net 12 is perpendicular to the incoming direction of the wind. The rectifying net 12 can be understood as a structure with multiple vents, and the vents of the rectifying net 12 can be circular holes, rectangular holes and polygonal holes. The rectifying net 12 can rectify the airflow to form an airflow with uniform cross-sectional velocity distribution.

[0060] Furthermore, a wavelength tube 15 is further provided at the second tube section 14, wherein the wavelength tube 15 is a quarter wavelength tube 15. The specific size design requirements for the wavelength tube 15 are as follows:

[0061] The calculation of the resonant frequency of a quarter-wavelength tube can be expressed by formula (1), which is as follows:

[0062]

[0063] In formula (1), f is the resonant frequency of the quarter-wavelength tube, L is the length of the quarter-wavelength tube 15; c is the speed of sound propagation, and n is a positive integer: 1, 2, 3...

[0064] The difference between the incident sound power level at the entrance of the muffler element and the transmitted sound power level at the exit, the higher the transmission loss value in a certain frequency band, the stronger the muffler performance in this frequency band, which is recorded as the sound transmission loss. The sound transmission loss can be expressed by formula (2), which is as follows:

[0065]

[0066] In formula (2), TL is the sound transmission loss, L is the length of the wavelength tube 15, m is the ratio of the cross-sectional area of ​​the wavelength tube 15 to the cross-sectional area of ​​the main tube (i.e., the second tube section 14), and n is a positive integer: 1, 2, 3...

[0067] From formula (1), it can be seen that the frequency of the quarter-wavelength tube depends only on the length of the wavelength tube. The longer the tube, the lower the frequency. From formula (2), it can be seen that there are two parameters that affect the transmission loss of the quarter-wavelength tube. One is the ratio m of the cross-sectional area of ​​the wavelength tube to the cross-sectional area of ​​the main tube, and the other is the length L of the wavelength tube. By reasonably arranging the length of the wavelength tube 15 and the value of m in this way, the noise can be weakened.

[0068] This embodiment arranges the rectifier net 12 in the cavity of the rectifier box 11, so that the airflow with uneven velocity distribution undergoes expansion, rectification and convergence to form an airflow with uniform cross-sectional velocity distribution, which is not only conducive to the arrangement and monitoring of the tester, but also makes the test data more stable and reliable, and plays an important role in ensuring the precise distribution and control of the air volume in the air duct. Secondly, a quarter-wavelength tube 15 is arranged in the second pipe section 14, and the end of the second pipe section 14 is sealed. When the sound wave enters the quarter-wavelength tube after being rectified from the rectifier box 11, the sound wave corresponding to the passing frequency is reflected back into the rectifier box 11 by the closed end of the second pipe section 14, and the wavelength corresponding to the passing frequency of the rectifier box 11 cancels each other due to the opposite phase, thereby achieving the purpose of silencing.

[0069] See also Figure 1 and Figure 2 In some embodiments, the radial dimension of the cavity gradually increases along the wind direction according to a first preset gradient to a first preset dimension, and then gradually decreases along the wind direction according to a second preset gradient to a second preset dimension; the rectifier net 12 is arranged at the radial interface where the radial dimension of the cavity is the first preset dimension.

[0070] In this embodiment, the first preset gradient and the second preset gradient can be set according to actual needs. The first preset gradient and the second preset gradient can be understood as the slope value of the change of the radial dimension. By increasing the radial dimension of the cavity of the rectifier box 11 first and then decreasing it, the airflow can be diffused, thereby slowing down the speed of the airflow. At the same time, when the airflow passes through the rectifier net 12, it can be fully diverted by the rectifier net 12 to form an airflow with uniform cross-sectional velocity distribution.

[0071] In some embodiments, the inner wall of the rectifier box 11 is also attached with crest cotton, which is used to absorb noise. During the rotation of the impeller, the blades interact with the gas, and the airflow passes through the blade interface to generate a turbulent boundary layer and vortex. The splitting and separation of the vortex causes the pulsation of pressure on the blades, radiating an unstable broadband noise, and passing into the air duct through the outlet of the fan 3. By attaching crest cotton to the four surfaces of the inner wall of the cavity of the rectifier box 11, since the inside of the crest cotton is full of tiny connecting holes, the porous structure can absorb a large amount of emitted sound waves, attenuate the sound waves, and absorb the medium and high broadband noise generated by the sound-absorbing fan 3.

[0072] See also Figure 1 and Figure 2 In some embodiments, the thermal anemometer 17 and a control unit are further included. The thermal anemometer 17 is disposed on the side wall of the second pipe section 14. The control unit is electrically connected to the thermal anemometer 17. In this embodiment, the thermal anemometer 17 is disposed on the side wall of the second pipe section 14, and can accurately measure the rectified wind speed data.

[0073] See also Figures 3 to 6In the second aspect, the present embodiment further provides an air purification device, including an air-conditioning unit 2, a fan 3 and a rectifying and noise reduction air duct 1, the air-conditioning unit 2 includes a shell 21, the shell 21 has a accommodating cavity, a first input port and a first output port, the first input port and the first output port are respectively connected to the accommodating cavity, and the first input port and the first output port are arranged opposite to each other; the fan 3 is arranged at the first output port; the rectifying and noise reduction air duct 1 is connected to the first output port, and the rectifying and noise reduction air duct 1 is the rectifying and noise reduction air duct 1 described in the first aspect.

[0074] In this embodiment, the air conditioning unit 2 is used to continuously provide pure air that meets the conditions of the operating room to the operating room, which includes filtering, purifying, and adjusting the temperature and humidity of the circulating gas in the operating room and the outdoor fresh air. The air conditioning unit 2 includes a housing 21, and the housing 21 has a first input port and a first output port, wherein the first input port is also the input end of the air conditioning unit 2, and the first output port is also the output end of the air conditioning unit 2. The fan 3 can be a centrifugal fan 3, and the noise generated by the fan 3 can be eliminated by using the rectifying noise reduction air duct 1.

[0075] For details, please refer to Figure 3 In some embodiments, a connecting pipe 4 is further included, one end of the connecting pipe 4 is connected to the first output port, and the other end of the connecting pipe 4 is connected to the first pipe section 13.

[0076] In some embodiments, the extending trend of the connecting pipe 4 is L-shaped, U-shaped or Z-shaped.

[0077] See also Figure 4 In some embodiments, the air-conditioning unit 2 further includes a filter component 22, a temperature control component 23 and a humidifying component 24, wherein the filter component 22 is disposed in the accommodating cavity, and the filter component 22 divides the accommodating cavity into an unfiltered cavity 211 and a filtered cavity 212; the temperature control component 23 is disposed in the filtered cavity 212; the humidifying component 24 is disposed in the filtered cavity 212 and between the temperature control component 23 and the first output port.

[0078] The filter assembly 22 is arranged in the accommodating chamber, and the filter assembly 22 can filter and purify the air for impurities. For example, the filter assembly 22 can be a combination of a coarse filter, a medium filter and a HEPA high-efficiency filter. The filter assembly 22 divides the accommodating chamber into an unfiltered chamber 211 and a filtered chamber 212, wherein the unfiltered chamber 211 is the setting area of ​​the first input port, that is, the cavity part of the accommodating chamber where the external air enters before being filtered, and the filtered chamber 212 is the setting area of ​​the first output port, that is, the cavity part of the accommodating chamber where the purified air is located. The temperature control assembly 23 can adjust the temperature of the air. In some application scenarios, such as winter in the north, the outdoor air temperature is low and it needs to be adjusted to the temperature required in the operating room; such as the same below in the south, the outdoor air temperature is high and it needs to be adjusted to the temperature required in the operating room. The humidification assembly 24 can be understood as a component for adjusting the humidity of the purified air. It can be understood that the humidification assembly 24 and the temperature control assembly 23 are both arranged in the filtered chamber 212 to adjust the temperature and humidity of the purified air.

[0079] See also Figure 4 and Figure 5 In some embodiments, the filter assembly 22 includes a first filter module 221, a second filter module 222 and a third filter module 223. The first filter module 221, the second filter module 222 and the third filter module 223 are spaced apart in sequence from the first input port to the first output port. The first filter module 221 is a primary filter, the second filter module 222 is a charging module, and the third filter module 223 is a dust collection module. The first filter module 221 is used to filter out large-sized particles, the second filter module 222 is used to release charges to small-sized particles remaining in the filtered air, and the third filter module 223 is used to adsorb small-sized particles with charges.

[0080] In this embodiment, the filter assembly 22 includes a first filter module 221, a second filter module 222 and a third filter module 223, wherein the first filter module 221 is a primary filter screen for capturing larger particles and dust, such as dust, dust, pollen, fiber and other visible particles to protect subsequent high-efficiency filters and air treatment equipment. The primary filter screen is usually made of fiber materials, such as synthetic fibers, glass fibers or paper filter materials, and can be a flat filter screen, a bag filter screen or a roll filter screen, and this embodiment does not limit this.

[0081] The second filter module 222 is a charging module, which can be an electrode sheet that can generate an electric field. The charging module can release negative charges in the air, and the negative charges can be adsorbed on the particles in the air, so that the particles are charged. Furthermore, the third filter module 223 is a dust collection module, where the dust collection module has special charge properties and can attract and capture particles with opposite charges in the air. When air passes through the dust collection module, the particles will be adsorbed to the surface of the module by electrostatic force, thereby being effectively removed. The linkage control of the second filter module 222 and the third filter module 223 can effectively adsorb and remove particles in the air, and obtain pure air that meets the requirements of the operating room.

[0082] See also Figure 4 and Figure 6 In some embodiments, the temperature control component 23 includes a first heat pipe 231 and a second heat pipe 232, and the first heat pipe 231 and the second heat pipe 232 are sequentially arranged in the filtered cavity 212 from the first input port to the first output port, and the thermal conductivity temperature of the first heat pipe 231 does not overlap with the thermal conductivity temperature of the second heat pipe 232; and / or, the humidification component 24 includes a water tank 241 and a humidification pipeline 242, the water tank 241 is connected to the humidification pipeline 242, the humidification pipeline 242 passes through the shell 21 and is placed in the filtered cavity 212, and a humidification spray hole is provided at the end of the humidification pipeline 242.

[0083] In this embodiment, the first heat pipe 231 and the second heat pipe 232 are usually used to adjust the temperature by heat conduction or heat conduction. The first heat pipe 231 and the second heat pipe 232 can be connected to different circuit components, and the heat conduction temperatures of the first heat pipe 231 and the second heat pipe 232 do not overlap, so that the temperature of the operating room can be accurately controlled, such as controlling the heat conduction temperatures of the first heat pipe 231 and the second heat pipe 232 according to a set value, thereby adjusting the temperature in the operating room. In this embodiment, the temperature control component 23 is set to maintain a comfortable temperature in the operating room, providing a suitable working and treatment environment for medical staff and patients.

[0084] The water in the water tank 241 is transported to the humidification nozzle through the humidification pipeline 242, and then released into the filtered chamber 212. The humidification nozzle is located on the flow path of the purified air to ensure that the moisture can be evenly distributed throughout the filtered chamber 212 and fully integrated with the purified air. The design and position of the humidification nozzle help provide a uniform humidification effect. This method can increase the humidity level in the operating room. Appropriate humidity helps reduce static electricity and the number of bacteria in the air, provide better surgical conditions, and keep patients comfortable.

[0085] In the above technical scheme, the rectifying noise reduction air duct 1 includes a rectifying box 11, a rectifying net 12, a first pipe section 13, a second pipe section 14, a wavelength tube 15 and an air valve 16, wherein the rectifying net 12 is arranged in the cavity of the rectifying box 11, so that the airflow with uneven velocity distribution is expanded, rectified and converged to form an airflow with uniform cross-sectional velocity distribution, which is not only conducive to the arrangement and monitoring of the tester, but also makes the test data more stable and reliable, which plays an important role in the accurate distribution and control of the air volume of the air duct. Secondly, a quarter-wavelength tube 15 is arranged in the second pipe section 14, and the end of the second pipe section 14 is sealed. When the sound wave enters the quarter-wavelength tube after being rectified from the rectifying box 11, the sound wave corresponding to the passing frequency is reflected back into the rectifying box 11 by the closed end of the second pipe section 14, and the wavelength corresponding to the passing frequency of the rectifying box 11 cancels each other due to the opposite phase, thereby achieving the purpose of silencing.

[0086] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the utility model, this does not limit the scope of patent protection of the utility model. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of the utility model using the contents recorded in the specification and drawings of the utility model, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of the utility model.

Claims

1. A rectifying and noise reducing air duct, characterized in that: include: A rectifier box has a first outlet and a first inlet arranged opposite to each other, and a cavity is formed inside the rectifier box; A rectifying net is arranged along the radial direction of the cavity, and the rectifying net divides the cavity into a first cavity and a second cavity; a first pipe section, connected to the first inlet; a second pipe section, connected to the first outlet, and the second pipe section is connected to an indoor air supply port; A wavelength tube, arranged on the side wall of the second tube section, the wavelength tube is connected to the second tube section, the wavelength tube is a quarter wavelength tube, and the end of the wavelength tube is closed; The air valve is arranged on the first pipe section, and the other end of the first pipe section is connected to the air outlet of the fan.

2. The rectifying and noise reducing air duct according to claim 1, characterized in that: The radial size of the cavity gradually increases along the wind direction according to a first preset gradient to the first preset size, and then gradually decreases along the wind direction according to a second preset gradient to the second preset size; The rectifying net is arranged at a radial interface where the radial dimension of the cavity is a first preset dimension.

3. The rectifying and noise reducing air duct according to claim 1, characterized in that: The inner side wall of the rectifier box is also attached with wave crest cotton, and the wave crest cotton is used to absorb noise.

4. The rectifying and noise reducing air duct according to claim 1, characterized in that: Also includes: A thermal anemometer, arranged on the side wall of the second pipe section; A control unit is electrically connected to the thermal anemometer.

5. An air purification device, characterized in that: include: An air conditioning unit, comprising a shell, the shell having a containing cavity, a first input port and a first output port, the first input port and the first output port are respectively connected to the containing cavity, and the first input port and the first output port are arranged opposite to each other; A fan, arranged at the first output port; A rectifying and noise-reducing air duct is connected to the first output port, and the rectifying and noise-reducing air duct is the rectifying and noise-reducing air duct according to any one of claims 1 to 4.

6. The air purification device according to claim 5, characterized in that: Also includes: A connecting pipeline, one end of which is connected to the first output port, and the other end of which is connected to the first pipe section.

7. The air purification device according to claim 6, characterized in that: The extending trend of the connecting pipeline is L-shaped, U-shaped or Z-shaped.

8. The air purification device according to claim 5, characterized in that: The air conditioning unit also includes: A filter assembly is disposed in the accommodating chamber, and the filter assembly divides the accommodating chamber into an unfiltered chamber and a filtered chamber; A temperature control component is disposed in the filtered cavity; The humidifying component is arranged in the filtered cavity and between the temperature control component and the first output port.

9. The air purification device according to claim 8, characterized in that: The filter assembly includes a first filter module, a second filter module and a third filter module, and the first filter module, the second filter module and the third filter module are spaced apart in sequence from the first input port to the first output port. The first filter module is a primary filter, the second filter module is a charging module, and the third filter module is a dust collection module. The first filter module is used to filter out large-sized particles, the second filter module is used to release charges to small-sized particles remaining in the filtered air, and the third filter module is used to absorb the small-sized particles with charges.

10. The air purification device according to claim 8, characterized in that: The temperature control assembly comprises a first heat conducting pipe and a second heat conducting pipe, wherein the first heat conducting pipe and the second heat conducting pipe are sequentially arranged in the filtered cavity from the first input port to the first output port, and the heat conducting temperature of the first heat conducting pipe does not overlap with the heat conducting temperature of the second heat conducting pipe; And / or, the humidification component includes a water storage tank and a humidification pipeline, the water storage tank is connected to the humidification pipeline, the humidification pipeline passes through the shell and is placed in the filtered cavity, and a humidification spray hole is provided at the end of the humidification pipeline.

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