Low-noise distributed air handling unit

Abstract

The invention discloses a low-noise distributed air handling unit which comprises a shell unit, an air handling unit and an active noise reduction unit, the air handling unit and the active noise reduction unit are arranged in the shell unit, and the air handling unit is arranged on a distributed air conditioner terminal system. Air conditioner airflow enters the air handling unit to be subjected to noise reduction treatment and then is transmitted into a room, the active noise reduction unit is matched with the air handling unit, and the active noise reduction unit collects noise emitted by the air handling unit in real time, processes noise characteristics and then emits corresponding anti-phase sound waves for counteracting noise reduction. The active noise reduction technology is combined with other sound insulation, noise elimination and shock absorption units, and the operation noise of the air conditioning unit is reduced according to the operation conditions.

Description

Technical Field

[0001] The present invention relates to the field of building technology, and in particular to a low-noise distributed air handling unit using active noise reduction technology. Background Art

[0002] Noise control in large spaces such as high-speed railway stations and airport terminals is of great value to personnel comfort, environmental satisfaction, broadcast information release, emergency safety, etc., and it is necessary to limit the noise levels of various noise sources indoors. At present, distributed air conditioning systems are increasingly used in large spaces in buildings. This system moves the air handling units that are conventionally placed in the machine room to the personnel activity area. While bringing energy-saving effects, it also introduces the noise of the air handling units into the personnel activity area. Distributed air handling units are the most obvious constant noise source in large spaces. Therefore, controlling their operating noise is crucial to the sound quality of the entire large space of the building.

[0003] Active noise reduction (ANC) technology uses a microphone to collect ambient noise, analyze it digitally, and process it with reverse sound waves to cancel out the sound waves, thereby achieving noise reduction. This technology is currently widely used in the headphone and automotive industries, especially in the automotive industry, which is similar to the technology of the present invention.

[0004] However, the existing active noise reduction technology is relatively expensive and is generally only available in high-end cars. The in-vehicle space relationship is complex, and if the phase of active noise reduction is deviated, not only will the noise reduction not be achieved, but it may also increase the noise.

[0005] Secondly, the existing active noise reduction technology is complex and often requires multiple microphones and speakers to cope with complex and changeable internal and external environmental noise sources. The active noise reduction of air conditioners mainly targets internal fixed noise sources, with the aim of preventing the internal noise of the air conditioner from affecting people in the external space.

[0006] Therefore, the existing active noise reduction method of the air conditioner has the technical problem of low reliability. It can be seen that how to improve the reliability of the active noise reduction method of the air conditioner is a problem that needs to be solved in the field. Summary of the invention

[0007] In view of the technical problem that the existing methods of active noise reduction of air conditioners have low reliability, the purpose of the present invention is to provide a low-noise distributed air handling unit, which solves the problems of difficult noise control, high cost implementation and excessively high cost of distributed air handling units, and effectively overcomes the problems existing in the prior art.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a low-noise distributed air handling unit, including a shell unit, and an air handling unit unit and an active noise reduction unit arranged in the shell unit. The air handling unit unit is arranged in a distributed air-conditioning terminal system, and the air-conditioning airflow enters the air handling unit unit for noise reduction processing before being transmitted to the room. The active noise reduction unit cooperates with the air handling unit unit. The active noise reduction unit collects the noise emitted by the air handling unit in real time, processes the noise characteristics, and then emits corresponding anti-phase sound waves to offset the noise.

[0009] Furthermore, the air handling unit is provided with a return air surface cooling section, a return air silencer section, a supply air fan section, a supply air silencer section, a static pressure supply air section and an electric nozzle in sequence from bottom to top. After the airflow enters the shell unit, driven by the power of the supply air fan section, the airflow passes through the return air surface cooling section, the return air silencer section, the supply air silencer section and the static pressure supply air section in sequence, and then leaves the air handling unit unit through the electric nozzle and enters the indoor space.

[0010] Furthermore, a filter assembly is provided at the inlet of the air handling unit, which is used to pre-filter the airflow entering the system.

[0011] Furthermore, a first shock-absorbing assembly is provided at the bottom of the air supply fan section, and the first shock-absorbing assembly includes a first base and a first spring. The first base is symmetrically arranged at the bottom of the air supply fan, and the first spring is arranged on the first base, and its top is fitted with the bottom of the air supply fan section, so that the vibration of the unit is reduced by spring shock-absorbing measures.

[0012] Furthermore, the active noise reduction unit is composed of a two-way line sound source component and a control cabinet component. The two-way line sound source components are respectively arranged on the inner and outer side walls of the shell unit. The control cabinet component controls the connection of the two-way line sound source component to control the two-way line sound source component to emit sound waves in the opposite phase to the noise propagation direction to offset the noise; the information screen cooperates with the controller to display the operation data of the air handling unit.

[0013] Furthermore, the control cabinet assembly includes a control cabinet and a controller arranged in the control cabinet, a reference sensor and an information screen. The reference sensor is arranged in the control cabinet and connected to the controller. It is used to monitor the frequency and power data of the operation of the air handling unit and transmit it to the controller. The controller emits a waveform with opposite phase, same frequency and close amplitude according to the detected data to offset the noise intensity of the primary sound source.

[0014] Furthermore, the active noise reduction unit also includes an error sensor, which is arranged on the shell unit and connected to the control cabinet. The error sensor can monitor the noise intensity of different frequency bands, monitor the noise characteristics of the space near the surface of the air-conditioning unit after sound elimination treatment in real time and feed back to the control cabinet component. The control cabinet component adjusts the waveform emitted by the two-way line sound source component according to the data monitored by the error sensor.

[0015] Furthermore, the housing unit is made of sound-insulating material.

[0016] Furthermore, a sound absorbing layer is attached to the inner wall of the shell unit.

[0017] Furthermore, a second shock-absorbing assembly is provided at the bottom of the shell unit, and the second shock-absorbing assembly includes a second base and a second spring. The second base is arranged at the bottom of the shell unit, and the second spring is arranged on the first base, and the top of the second spring is arranged to fit the bottom of the shell unit. When the unit is running, the up and down vibration of the spring is used to reduce the displacement of the unit body, thereby reducing the overall vibration noise of the unit.

[0018] The low-noise distributed air handling unit provided by the present invention is a distributed air-conditioning terminal system installed inside a tall space indoor of a building. It has the characteristics of achieving equipment noise below 50dB(A) through various noise reduction measures such as active noise reduction technology, solving the problems of difficult control of noise of distributed air handling units and difficulty in implementation and high cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 This is the structural front view of this low-noise distributed air handling unit;

[0021] Figure 2 This is the left view of the structure of this low-noise distributed air handling unit;

[0022] Figure 3 This is the right view of the structure of this low-noise distributed air handling unit;

[0023] Figure 4 This is a top view of the structure of the low-noise distributed air handling unit;

[0024] Figure 5 This is a schematic diagram of the structural principle of the active noise reduction unit of the low-noise distributed air handling unit.

[0025] The following is a description of the components in the accompanying drawings:

[0026] 1. Housing unit 2. Air handling unit 3. Active noise reduction unit

[0027] 11. Second damping assembly 21. Surface cooler 22. Return air muffler 23. Supply air fan 231. First damping assembly 24. Supply air muffler 25. Muffler static pressure box 26. Electric nozzle 27. Filter assembly 31. Control cabinet assembly 311. Control cabinet 312. Controller 313. Reference sensor 32. Two-way line sound source assembly 321. First two-way line sound source 322. Second two-way line sound source 33. Error sensor DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0029] The existing noise reduction technology of distributed air conditioners has a technical problem of low reliability. To address this technical problem, the present invention provides a low-noise distributed air handling unit, which is a distributed air conditioning terminal system installed in a tall space indoor of a building. It has the characteristics of achieving equipment noise below 50dB(A) through various noise reduction measures such as active noise reduction technology. The present invention applies active noise reduction technology to distributed air conditioning equipment for the first time, and solves the problems of difficult noise control, high cost implementation and excessively high cost of distributed air handling units.

[0030] The low-noise distributed air handling unit provided by the present invention is Figure 1-Figure 4 , which comprises a shell unit 1 and an air handling unit unit 2 arranged inside the shell unit.

[0031] An electric nozzle 26 is provided on the top of the air handling unit 2, and the interior thereof is divided into several areas from bottom to top. Ventilation holes are provided between each area. After being processed in each functional area, the airflow is transported to the next area through the provided ventilation holes until it leaves the air handling unit and enters the indoor space.

[0032] The air handling unit 2 is distributed with five areas from bottom to top. The first area is the return air surface cooling section, which is equipped with a surface cooler 21 inside, which is used to cool the air and condense it into water droplets, and then drip into the water pan of the surface cooler under the action of gravity; the second area is the return air silencer section, which is equipped with a return air silencer 22 inside, which is used to prevent the noise of the fan section from being transmitted to the room through the air inlet of the unit; the third area is the supply air fan section, which is equipped with a supply air fan 23 inside, and the supply air fan is used to provide power for air flow transportation; the fourth area is the supply air silencer section, which is equipped with a supply air silencer 24 inside, which is used to prevent the fan noise from being transmitted to the indoor space with the air flow; the fourth area is the static pressure supply air section, which is equipped with a static pressure supply air box 25 inside, which is used to distribute the airflow of the unit.

[0033] After entering the air handling unit 2, the air flow is driven by the air supply fan 23 and passes through the surface cooler 21, the return air silencer 22, the supply air silencer 23, the supply air silencer 24, the silencer static pressure box 25 from bottom to top, and finally leaves the air handling unit 2 from the electric nozzle 26 and enters the indoor space.

[0034] In addition, a primary filter assembly 27 is provided at the inlet of the shell unit 1 and the inlet of the air handling unit unit 2, which is used to pre-filter the airflow entering the system and filter out impurities in the airflow entering the system to avoid the influence of impurities on the internal components of the system, while ensuring the quality of the airflow discharged through the air handling unit unit 2.

[0035] The present invention does not limit the structure of the filter assembly 27. As an example, a return air grille or a filter screen may be used, and the specific structure may be determined according to actual conditions.

[0036] A first shock absorbing assembly 231 is provided at the bottom of the air supply fan 23 for reducing the vibration of the air supply fan 23. The first shock absorbing assembly 231 includes a first base and a first spring. The first base is symmetrically arranged at the bottom of the air supply fan 23. The first spring is arranged on the first base, and its top is fitted with the bottom of the air supply fan 23. The vibration of the unit is reduced by spring shock absorbing measures.

[0037] On this basis, a set of active noise reduction units 3 are configured on each of the four sides of the unit corresponding to the air supply fan section area. The active noise reduction unit 3 is used to reduce the noise generated by the operation of the air handling unit unit 2 and the external noise near the air handling unit unit 2. Figure 5 The active noise reduction unit 3 includes a bidirectional line sound source component 32 , an error sensor 33 and a control cabinet component 31 .

[0038] Among them, the first two-way line sound source 321 in the two-way line sound source component 32 is arranged on the inner wall of the air supply fan section, which emits a secondary sound source. The secondary sound source can be set to a sound wave with an anti-phase with the primary sound source emitted by the air supply fan 23 to offset the noise intensity of the primary sound source and reduce the noise emitted by the air supply fan 23.

[0039] The second two-way line sound source 322 is arranged on the outer wall of the shell unit 1, which emits a secondary sound source. The secondary sound source can be set to a sound wave with an anti-phase with the primary sound source generated by the spatial broadcasting in the external building, offsetting the noise intensity of the primary sound source and reducing the noise of the spatial broadcasting in the building.

[0040] At the same time, the second two-way line sound source 322 can also be configured to emit sound waves in anti-phase with the primary sound source emitted by the air supply fan 23 inside the unit to offset the noise intensity of the primary sound source, thereby further controlling the intensity of the unit noise propagating to the surrounding space.

[0041] The error sensor 33 is arranged on the shell unit 1 and connected to the control cabinet 311. The error sensor 33 can monitor the noise intensity of different frequency bands, monitor the noise characteristics of the space near the surface of the air-conditioning unit after sound elimination in real time, and feed back to the control cabinet component 31.

[0042] The control cabinet assembly 31 includes a control cabinet 311, and a control system is provided inside the control cabinet 311. The control system can adjust the waveform of the anti-phase emitted by the two-way line sound source assembly according to the frequency and noise characteristics of the primary sound source. The control system includes a controller 312, a reference sensor 313 and an information screen.

[0043] The reference sensor 313 is arranged in the control cabinet 311 and connected to the controller 312. It is used to monitor the frequency and power data of the air supply fan 23 and transmit them to the controller 312. The controller 312 collects the operating frequency and noise characteristics of the primary sound source (air supply fan) according to the reference sensor, and the secondary sound source emits a waveform with opposite phase, same frequency and close amplitude to offset the noise intensity of the primary sound source.

[0044] At the same time, the controller 312 monitors the noise characteristics of the space near the surface of the air-conditioning unit after the sound elimination treatment in real time according to the error sensor 33, and adjusts the waveform emitted by the secondary sound source to achieve the effect of noise reduction.

[0045] Here, feedforward control is adopted. For stable noise sources, compensation is performed according to the change of disturbance or given value. When the fan operation condition is disturbed, before the controlled variable changes, control is performed according to the size of the disturbance to compensate for the influence of the disturbance on the controlled variable. This can reduce the amount of sensors used, is cheap, and has a simple principle.

[0046] The information screen cooperates with the controller 312 to display data such as the noise value, noise reduction amount, and operating frequency of the unit.

[0047] Furthermore, the housing unit 1 in the present solution is preferably made of a dense aluminum alloy material to isolate the transmission of noise.

[0048] Secondly, the shell unit 1 is preferably attached with a polymer composite material to absorb sound, thereby reducing the transmission of the operating noise of the air supply fan 23 through the shell unit 1 and isolating the internal noise. At the same time, it can also play a role in flow balance.

[0049] At the same time, a second shock absorbing assembly 11 is provided at the bottom of the shell unit 1, which is used to reduce the vibration noise of the whole unit. The second shock absorbing assembly 11 includes a second base and a second spring. The second base is arranged at the bottom of the shell unit 1, and the second spring is arranged on the first base. The top of the second spring is fitted with the bottom of the shell unit 1. When the unit is running, the up and down vibration of the spring is used to reduce the displacement of the unit body, thereby reducing the vibration noise of the whole unit.

[0050] Compared with other active noise reduction schemes, the low-noise distributed air handling unit formed by the above scheme is the first to apply active noise reduction technology to distributed air-conditioning equipment, and the implementation cost is relatively low.

[0051] Secondly, through active noise reduction technology and combined with other sound insulation, noise reduction and vibration reduction units, the operating noise of the air-conditioning unit can be reduced to below 50dB(A) depending on the operating conditions.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-noise distributed air handling unit, characterized in that: It includes a shell unit, an air handling unit unit and an active noise reduction unit arranged in the shell unit. The air handling unit unit is arranged in a distributed air-conditioning terminal system. The air-conditioning airflow enters the air handling unit unit for noise reduction processing and then is transmitted to the room. The active noise reduction unit cooperates with the air handling unit unit. The active noise reduction unit collects the noise emitted by the air handling unit in real time, processes the noise characteristics, and then emits corresponding anti-phase sound waves to offset the noise.

2. A low-noise distributed air handling unit according to claim 1, characterized in that: The air handling unit is provided with a return air cooling section, a return air silencer section, a supply air fan section, a supply air silencer section, a static pressure supply air section and an electric nozzle in sequence from bottom to top. After the airflow enters the shell unit, it is driven by the power of the supply air fan section and passes through the return air cooling section, the return air silencer section, the supply air silencer section and the static pressure supply air section in sequence, and then leaves the air handling unit through the electric nozzle and enters the indoor space.

3. A low-noise distributed air handling unit according to claim 2, characterized in that: The inlet of the air handling unit is equipped with a filter assembly, which is used to pre-filter the airflow entering the system.

4. A low-noise distributed air handling unit according to claim 2, characterized in that: A first shock-absorbing assembly is provided at the bottom of the air supply fan section, and the first shock-absorbing assembly includes a first base and a first spring. The first base is symmetrically arranged at the bottom of the air supply fan, and the first spring is arranged on the first base, and the top of the first spring is fitted with the bottom of the air supply fan section, so that the vibration of the unit is reduced by spring shock-absorbing measures.

5. A low-noise distributed air handling unit according to claim 1, characterized in that: The active noise reduction unit is composed of a two-way line sound source component and a control cabinet component. The two-way line sound source components are respectively arranged on the inner and outer side walls of the shell unit. The control cabinet component controls the connection of the two-way line sound source component to control the two-way line sound source component to emit sound waves in the opposite phase to the noise propagation direction to offset the noise reduction; the information screen cooperates with the controller to display the operation data of the air handling unit.

6. A low-noise distributed air handling unit according to claim 5, characterized in that: The control cabinet assembly includes a control cabinet and a controller arranged in the control cabinet, a reference sensor and an information screen. The reference sensor is arranged in the control cabinet and connected to the controller. It is used to monitor the frequency and power data of the operation of the air handling unit and transmit them to the controller. The controller sends a waveform with opposite phase, same frequency and close amplitude according to the detected data to offset the noise intensity of the primary sound source.

7. A low-noise distributed air handling unit according to claim 6, characterized in that: The active noise reduction unit also includes an error sensor, which is arranged on the shell unit and connected to the control cabinet. The error sensor can monitor the noise intensity of different frequency bands, monitor the noise characteristics of the space near the surface of the air-conditioning unit after sound elimination in real time, and feed back to the control cabinet component. The control cabinet component adjusts the waveform emitted by the two-way line sound source component according to the data monitored by the error sensor.

8. A low-noise distributed air handling unit according to claim 1, characterized in that: The housing unit is made of sound-insulating material.

9. A low-noise distributed air handling unit according to claim 8, characterized in that: A sound absorbing layer is attached to the inner wall of the shell unit.

10. A low-noise distributed air handling unit according to claim 9, characterized in that: A second shock-absorbing assembly is provided at the bottom of the shell unit, and the second shock-absorbing assembly includes a second base and a second spring. The second base is arranged at the bottom of the shell unit, and the second spring is arranged on the first base. The top of the second base is fitted with the bottom of the shell unit. When the unit is running, the up and down vibration of the spring is used to reduce the displacement of the unit body, thereby reducing the overall vibration noise of the unit.

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