Large-flow fresh air noise reduction device for small cabin

Abstract

The invention relates to the technical field of fresh air noise reduction, in particular to a large-flow fresh air noise reduction device for a small cabin. An inlet of the first surge tank is communicated with an air outlet of the fresh air machine; an inlet of the second surge tank is communicated with an air outlet of the first surge tank; one end of the main pipeline is communicated with the air outlet of the second surge tank; one side of the branch pipeline is communicated with the other end of the main pipeline; one end of the branch pipeline is communicated with the other side of the branch pipeline; and the silencing cavity communicates with the other side of the branch pipeline, and the silencing cavity and the main pipeline are symmetrically arranged about the axis of the branch pipeline. According to the fresh air noise reduction device, noise can be effectively reduced on the premise that the ventilation efficiency of the fresh air machine is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air noise reduction, and in particular to a large-flow fresh air noise reduction device for a small cabin. Background Art

[0002] With the development of society and the improvement of people's living standards, the requirements for indoor air quality in small cabins such as ship cabins, mobile RVs, small offices, laboratories and other confined spaces have increased. As an effective means to improve indoor air quality, fresh air systems have been widely used in these small cabins. However, due to space limitations and design requirements, small cabins often use large-flow fresh air systems to ensure sufficient air circulation. However, during the operation of large-flow fresh air systems, due to factors such as fast air flow speed, pipeline vibration, and fan rotation, large noise is likely to be generated. These noises not only affect the living and working environment in the cabin, but may also cause fatigue and discomfort to passengers or staff.

[0003] Existing noise reduction measures for fresh air systems mainly focus on wrapping pipes with sound insulation materials, installing basic vibration reduction devices, and selecting low-noise fans. However, these measures have certain limitations in practical applications. For example, sound insulation materials may affect the ventilation efficiency of pipes, and vibration reduction devices and low-noise fans are expensive and have poor effects in certain high-frequency noise ranges. Therefore, how to effectively reduce noise without affecting the ventilation efficiency of the fresh air system has become a technical problem that technicians in this field need to solve in the design of fresh air systems. Summary of the invention

[0004] The present invention provides a large-flow fresh air noise reduction device for a small cabin, which is used to solve the problem of how to effectively reduce noise while ensuring the ventilation efficiency of the fresh air fan.

[0005] The present invention provides a large-flow fresh air noise reduction device for a small cabin, comprising:

[0006] New air blower;

[0007] A first pressure stabilizing tank, the inlet of which is connected to the air outlet of the fresh air fan;

[0008] A second pressure stabilizing tank, the inlet of which is connected to the air outlet of the first pressure stabilizing tank;

[0009] A main pipeline, one end of which is connected to the air outlet of the second pressure-stabilizing tank;

[0010] A branch pipeline, one side of which is connected to the other end of the main pipeline;

[0011] A branch pipeline, one end of which is connected to the other side of the branch pipeline;

[0012] The silencer chamber is communicated with the other side of the branch pipeline and is symmetrically arranged with the main pipeline about the axis of the branch pipeline.

[0013] In some embodiments, it also includes:

[0014] a sound sensor, located in the small cabin;

[0015] A temperature sensor is located in the small compartment.

[0016] In some embodiments, it also includes:

[0017] The controller is electrically connected to the sound sensor, the temperature sensor, and the fresh air fan.

[0018] In some embodiments, it also includes:

[0019] The noise reduction structure has an air inlet connected to the main pipeline and an air outlet connected to the branch pipeline.

[0020] In some embodiments, it also includes:

[0021] A first connecting pipe, used to connect the fresh air fan and the first pressure-stabilizing tank;

[0022] The second connecting pipe is used to connect the first pressure stabilizing tank and the second pressure stabilizing tank.

[0023] In some embodiments, the first connecting pipe, the second connecting pipe and the main pipe all include:

[0024] First hose;

[0025] a rigid tube, one end of which is connected to the first flexible tube;

[0026] One end of the second flexible pipe is connected to the other end of the rigid pipe.

[0027] In some embodiments, inner walls of the first connecting pipe, the second connecting pipe and the main pipe are smooth.

[0028] In some embodiments, the volume of the first pressure stabilizing tank is 1.5-2 times the volume of the second pressure stabilizing tank, and the inner diameter of the first connecting pipe is 1.5 times the inner diameter of the second connecting pipe.

[0029] In some of the embodiments, the ratio of the maximum flow of the fresh air fan to the total cross-sectional area of ​​the branch pipeline is less than 4, and the length of the branch pipeline is greater than 2 times the inner diameter of the branch pipeline.

[0030] In some of the embodiments, vibration isolation structures are installed on the fresh air fan, the first pressure-surge tank and the second pressure-surge tank.

[0031] The beneficial effects of the present invention are as follows:

[0032] The large-flow fresh air noise reduction device for small cabins provided by the present invention can effectively reduce the noise of the fresh air blower during operation, especially the turbulence caused by the instability of the fresh air blower, the whistling caused by the friction of the pipeline, and the flow noise caused by the too fast flow rate of the large-flow fresh air blower, effectively reducing the noise caused by the large-flow fresh air system in the small cabin and improving the living and working comfort of the cabin. More importantly, the large-flow fresh air noise reduction device is easy to implement and can effectively reduce noise without affecting the ventilation efficiency of the fresh air blower. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a large-flow fresh air noise reduction device for a small cabin according to the present invention;

[0034] Figure 2 yes Figure 1 The installation diagram of the branch pipeline, sub-pipeline, silencer cavity and noise reduction structure shown;

[0035] Figure 3 yes Figure 1 A schematic diagram of the connection of the first hose, the rigid tube and the second hose shown;

[0036] Figure 4 yes Figure 1 A schematic diagram of the noise reduction structure shown;

[0037] Figure 5 yes Figure 1 The schematic diagram of the structure of the silencer cavity is shown.

[0038] In the attached drawings, 1. fresh air fan; 2. first pressure-stabilizing tank; 3. second pressure-stabilizing tank; 4. main pipeline; 5. branch pipeline; 6. branch pipeline; 7. silencer chamber; 71. perforated plate; 72. silencer chamber body; 73. noise reduction plate; 8. small cabin; 9. noise reduction structure; 91. first channel; 92. first silencer chamber; 93. second channel; 94. second silencer chamber; 95. third channel; 96. first silencer board; 97. second silencer board; 10. first connecting pipe; 11. second connecting pipe; 12. first hose; 13. rigid pipe; 14. second hose. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] As described in the background technology, traditional sound insulation materials are used to wrap the pipes, basic vibration reduction devices are installed, and low-noise fans are selected. The sound insulation materials reduce the ventilation efficiency of the pipes, and the vibration reduction devices and low-noise fans are expensive and have poor effects in certain high-frequency noise ranges. Therefore, how to effectively reduce noise without affecting the ventilation efficiency of the fresh air system has become a technical problem that technicians in this field need to solve in the design of fresh air systems.

[0041] To solve the above problems, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present invention provides a large-flow fresh air noise reduction device for a small cabin, comprising: a fresh air fan 1, a first pressure-stabilizing tank 2, a second pressure-stabilizing tank 3, a main pipeline 4, a branch pipeline 5 and a branch pipeline 6 connected in sequence, a silencer chamber 7 and the main pipeline 4 are symmetrically arranged about the axis of the branch pipeline 5, and the silencer chamber 7 is connected to one side of the branch pipeline 5, and the main pipeline 4 is connected to the other side of the branch pipeline 5, and the number of the branch pipelines 6 is multiple, and the multiple branch pipelines 6 and the silencer chamber 7 are located on the same side of the branch pipeline 5.

[0042] The gas generated by the fresh air fan 1 enters the first pressure-stabilizing tank 2. The first pressure-stabilizing tank 2 can stabilize the gas pressure, buffer the gas pressure fluctuation, and provide a smooth airflow. The airflow stabilized by the first pressure-stabilizing tank 2 enters the second pressure-stabilizing tank 2 to further stabilize the airflow, and then enters the main pipeline 4, branch pipeline 5 and sub-pipeline 6 in sequence. The airflow entering the branch pipeline 5 first passes through the silencer chamber 7 to remove noise, and then diffuses and flows along the axial direction of the branch pipeline 5, is diverted to multiple sub-pipelines 6, and finally enters the small cabin.

[0043] The large-flow fresh air noise reduction device for small cabins provided by the present invention can effectively reduce the noise of the fresh air blower during operation, especially the turbulence caused by the instability of the fresh air blower, the whistling caused by the friction of the pipeline, and the flow noise caused by the too fast flow rate of the large-flow fresh air blower, effectively reducing the noise caused by the large-flow fresh air system in the small cabin and improving the living and working comfort of the cabin. More importantly, the large-flow fresh air noise reduction device is easy to implement and can effectively reduce noise without affecting the ventilation efficiency of the fresh air blower.

[0044] In some embodiments, the silencer chamber 7 includes a perforated plate 71 and a silencer chamber body 72 connected to the perforated plate 71, the silencer chamber body 72 includes a noise reduction plate 73, the noise reduction plate 73 is arranged parallel to the perforated plate 71, the distance between the noise reduction plate 73 and the perforated plate 71 is about 43 mm, the thickness of the perforated plate 71 is less than the thickness of the main pipe, the aperture of the perforated plate 71 is about 1 mm, and the perforation rate is not less than 3%.

[0045] During specific use, the perforated plate 71 of the silencing chamber 7 is installed on the branch pipeline 5. The cross-section of the perforated plate 71 is larger than the cross-section of the main pipeline 4. That is to say, the branch pipeline 5 is connected with the perforated plate 71 to ensure that the gas in the main pipeline 4 enters the silencing chamber 7 after passing through the branch pipeline 5. After the gas is reflected and refracted multiple times in the silencing chamber 7, the energy of the sound wave will gradually weaken, and the noise will gradually disappear, and then enter the branch pipeline 6 along the branch pipeline 5.

[0046] In some of the embodiments, the system further includes: a sound sensor and a temperature sensor.

[0047] The sound sensor is located in the small cabin 8 and is used to detect the sound pressure level in the small cabin 8. Preferably, the sound sensor is installed in a sound pressure level sensitive area inside the small cabin 8 and can be installed in the middle of the small cabin 8.

[0048] The temperature sensor is located in the small compartment 8 and is used to detect the temperature in the small compartment 8 . The temperature sensor can be installed in the middle of the small compartment 8 .

[0049] In some of the embodiments, it further includes: a controller electrically connected to the sound sensor, the temperature sensor, and the fresh air fan 1.

[0050] The sound sensor collects the sound pressure level inside the small cabin 8 in real time, and transmits the collected signal to the controller. When the collected sound pressure level reaches the maximum preset sound pressure level, the fresh air fan 1 automatically reduces the wind speed to meet the sound pressure level requirement; the sound sensor collects the internal temperature of the small cabin 8 in real time, and transmits the collected signal to the controller. When the collected temperature is significantly different from the preset temperature, air can be supplied at the maximum wind speed that meets the sound pressure level requirement; when the temperature is slightly different from the set temperature, the wind speed is appropriately reduced to meet the temperature requirement.

[0051] By setting up a controller and a sound sensor electrically connected to the controller, the temperature sensor and the fresh air fan 1, it is convenient to monitor the sound pressure level and temperature in the small cabin 8 in real time, and adjust the wind speed of the fresh air fan 1 according to the sound pressure level and temperature in the small cabin 8, so as to control the noise and temperature in the small cabin 8 within an appropriate range.

[0052] In some of the embodiments, the noise reduction structure further comprises: a noise reduction structure 9 , an air inlet of the noise reduction structure 9 is connected to the main pipeline 4 , and an air outlet of the noise reduction structure 9 is connected to the branch pipeline 5 .

[0053] The noise reduction structure 9 includes a first channel 91, a first silencer chamber 92, a second channel 93, a second silencer chamber 94 and a third channel 95 which are connected in sequence. The first channel 91, the second channel 93 and the third channel 95 are arranged in parallel. The first silencer chamber 92 and the second silencer chamber 94 are arranged in parallel. The first silencer chamber 92 and the second silencer chamber 94 are both narrow and long rectangular pipes. The first silencer chamber 92 and the second silencer chamber 94 both include a first silencer plate 96 and a second silencer plate 97 which are arranged in parallel. The directions of airflow in the first channel 91 and the second channel 93 are opposite, and the directions of airflow in the second channel 93 and the third channel 95 are opposite.

[0054] Specifically, the fresh air enters the first silencer chamber 92 from the gas channel 91, and the sound waves are reflected and refracted multiple times by the first silencer plate 96 and the second silencer plate 97 of the first silencer chamber 92. The energy of the sound waves will gradually weaken, and the noise will gradually disappear. Then, the fresh air enters the second silencer chamber 94 through the second channel 93, and the sound waves are reflected and refracted multiple times by the two silencer plates in the second silencer chamber 94, and the noise is reduced again, and finally flows out through the third channel 95.

[0055] Some of the embodiments further include: a first connecting pipe 10 and a second connecting pipe 11, wherein the first connecting pipe 10 is used to connect the fresh air fan 1 with the first pressure stabilizing tank 2. The second connecting pipe 11 is used to connect the first pressure stabilizing tank 2 with the second pressure stabilizing tank 3.

[0056] In some embodiments, the first connecting pipe 10, the second connecting pipe 11 and the main pipeline 4 all include: a first hose 12, a rigid pipe 13 and a second hose 14 connected in sequence, that is, the main pipeline adopts a rigid pipe 13, based on the high rigidity and low natural frequency of the rigid pipe 13, it can provide stable support and high structural strength to ensure the stability and reliability of the entire device; a hose is used at the connection with the fresh air fan 1, the first pressure stabilizing tank 2, the second pressure stabilizing tank 3 and the branch pipeline 5, based on the high flexibility and large damping ratio of the hose, it can effectively absorb vibration and reduce noise, thereby reducing the occurrence of resonance. Preferably, the rigid pipe 13 is connected to the first hose 12 and the second hose 14 by flanges, and a tetrafluoroethylene sealing pad is installed between the flanges. The hose can further achieve vibration isolation. The peaks and troughs of the first hose 12 and the second hose 14 are related to the speed of gas flow in the main pipeline. The smaller the gas flow rate and the smaller the peaks and troughs of the hose, the smaller the wind noise generated by the pipeline.

[0057] It is worth noting that the use of the first hose 12, the rigid tube 13 and the second hose 14 connected in sequence has the following beneficial effects: First, vibration absorption: based on the damping ratio of the hose being generally 0.03-0.065, and the damping ratio of the rigid tube 13 being 0.005-0.0075, the high damping characteristics of the hose can effectively absorb vibration energy and reduce the propagation of vibration; second, the natural frequency is changed to reduce resonance: based on the natural frequency of the hose being generally low, and the natural frequency of the rigid tube 13 being high, the natural frequency of the device can be adjusted to be staggered with the external excitation frequency by using the rigid tube 13 in combination with the hose, thereby avoiding resonance; third, vibration transmission is reduced: the flexibility of the hose can reduce the vibration transmission from the fresh air fan 1, the first pressure stabilizing tank 2, and the second pressure stabilizing tank 3 to the pipeline, thereby reducing the vibration level of the entire device and further reducing noise; fourth, it is convenient for the movement of the cabin: based on the branch pipeline 5 and the branch pipeline 6 being located in the small cabin 8, the branch pipeline 5 is connected by the second hose 14, which can increase the mobility of the cabin and is suitable for a movable cabin.

[0058] In some embodiments, the inner walls of the first connecting pipe 10, the second connecting pipe 11 and the main pipe 4 are smooth. The smooth inner wall can reduce the resistance of gas flow, thereby reducing the impact of gas and the inner wall of the pipeline and reducing noise.

[0059] In some embodiments, the volume of the first pressure stabilizing tank 2 is 1.5-2 times the volume of the second pressure stabilizing tank 3, and the inner diameter of the first connecting pipe 10 is 1.5 times the inner diameter of the second connecting pipe 11, which can increase the pressure stabilizing effect.

[0060] In some of the embodiments, the ratio of the maximum flow rate of the fresh air fan 1 to the total cross-sectional area of ​​the branch pipe 6 is less than 4, ensuring a gentle outlet wind speed. At the same time, the length of the branch pipe 6 is greater than 2 times the inner diameter of the branch pipe 5, so that the branch pipe 6 has enough distance to slow down the airflow, thereby reducing flow noise.

[0061] In some of the embodiments, vibration isolation structures are installed on the fresh air fan 1, the first pressure-surge tank 2 and the second pressure-surge tank 3 to reduce the vibration of the fresh air fan 1, the first pressure-surge tank 2 and the second pressure-surge tank 3, thereby reducing noise.

[0062] Specifically, in the exemplary embodiment, a rubber pad is provided at the bottom of the fresh air fan 1 to reduce the vibration generated by the fresh air fan 1. Damping pads are installed at the bottoms of the first pressure stabilizing tank 2 and the second pressure stabilizing tank 3 to isolate the vibration between the fresh air fan and the first pressure stabilizing tank 2. The first pressure stabilizing tank 2 and the second pressure stabilizing tank 3 are both made of stainless steel.

[0063] The branch pipe 5 can further stabilize the airflow and reduce the flow rate. The branch pipe 5 is installed inside the cabin with a fixing, and a rubber pad is used between the fixing and the branch pipe 4. At the same time, the branch pipe 5 is connected to the branch pipe 6 through a tee. The number of branch pipes 6 and the sum of the cross-sectional areas of the branch pipes 5 have an effect on the air flow rate.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean 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 present invention. 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, unless they are contradictory.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A large-flow fresh air noise reduction device for a small cabin, characterized in that: include: New air blower; A first pressure stabilizing tank, the inlet of which is connected to the air outlet of the fresh air fan; A second pressure stabilizing tank, the inlet of which is connected to the air outlet of the first pressure stabilizing tank; A main pipeline, one end of which is connected to the air outlet of the second pressure-stabilizing tank; A branch pipeline, one side of which is connected to the other end of the main pipeline; A branch pipeline, one end of which is connected to the other side of the branch pipeline; The silencer chamber is communicated with the other side of the branch pipeline and is symmetrically arranged with the main pipeline about the axis of the branch pipeline.

2. The large-flow fresh air noise reduction device for a small cabin according to claim 1 is characterized in that: Also includes: a sound sensor, located in the small cabin; A temperature sensor is located in the small compartment.

3. The large-flow fresh air noise reduction device for a small cabin according to claim 2 is characterized in that: Also includes: The controller is electrically connected to the sound sensor, the temperature sensor, and the fresh air fan.

4. The large-flow fresh air noise reduction device for a small cabin according to claim 1 is characterized in that: Also includes: The noise reduction structure has an air inlet connected to the main pipeline and an air outlet connected to the branch pipeline.

5. The large-flow fresh air noise reduction device for a small cabin according to claim 1 is characterized in that: Also includes: A first connecting pipe, used to connect the fresh air fan and the first pressure-stabilizing tank; The second connecting pipe is used to connect the first pressure stabilizing tank and the second pressure stabilizing tank.

6. The large-flow fresh air noise reduction device for a small cabin according to claim 5, characterized in that: The first connecting pipe, the second connecting pipe and the main pipe all include: First hose; a rigid tube, one end of which is connected to the first flexible tube; One end of the second flexible pipe is connected to the other end of the rigid pipe.

7. The large-flow fresh air noise reduction device for a small cabin according to any one of claims 1 to 6, characterized in that: The inner walls of the first connecting pipe, the second connecting pipe and the main pipe are smooth.

8. The large-flow fresh air noise reduction device for a small cabin according to any one of claims 1 to 6, characterized in that: The volume of the first pressure stabilizing tank is 1.5-2 times the volume of the second pressure stabilizing tank, and the inner diameter of the first connecting pipe is 1.5 times the inner diameter of the second connecting pipe.

9. The large-flow fresh air noise reduction device for a small cabin according to any one of claims 1 to 6, characterized in that: The ratio of the maximum flow of the fresh air fan to the total cross-sectional area of ​​the branch pipeline is less than 4, and the length of the branch pipeline is greater than 2 times the inner diameter of the branch pipeline.

10. The large-flow fresh air noise reduction device for a small cabin according to any one of claims 1 to 6, characterized in that: Vibration isolation structures are installed on the fresh air fan, the first pressure-stabilizing tank and the second pressure-stabilizing tank.

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