WO2021004167A1

WO2021004167A1 - Ducted air conditioner

Info

Publication number: WO2021004167A1
Application number: PCT/CN2020/091202
Authority: WO
Inventors: 李怀成; 王庆杰; 王涛; 徐鹏洋; 殷豪杰; 华如文
Original assignee: 青岛海信日立空调系统有限公司
Priority date: 2019-07-05
Filing date: 2020-05-20
Publication date: 2021-01-14
Also published as: CN110500762A; CN111059752A; CN211695344U; WO2021004166A1; CN211823082U; CN111059753A

Abstract

The present application discloses a ducted air conditioner. A noise reduction assembly is provided at an air outlet, and comprises a controller, and a noise detector and a noise reducer which are connected to the controller; the noise reducer is located between the noise detector and a noise error detector; and the controller is used for controlling, according to a first noise signal of the ducted air conditioner detected by the noise detector, the noise reducer to send an opposite-phase noise reduction signal of the first noise signal.

Description

A kind of air duct machine

This application is required to be submitted to the Chinese Patent Office on July 5, 2019, the application number is CN201910606287.5, and the application name is "A noise reduction component and air duct machine for air duct machines"; submitted on February 28, 2020 The Chinese Patent Office, the application number is CN202010129724.1, the application name is "a kind of air duct machine"; and it was submitted to the Chinese Patent Office on February 28, 2020, the application number is CN202020227020.3, the application name is "a kind of air duct machine" "The priority of the Chinese patent application, the entire content of which is incorporated into this application by reference.

Technical field

The application relates to the field of air conditioning technology, and in particular to a noise reduction component of a duct machine and a duct machine.

Background technique

With the continuous improvement of economic development and quality of life, air conditioners have become a common household appliance. The noise generated by traditional air conditioners in the heating and cooling process is transmitted into the air, which has seriously affected people’s daily lives. Life, therefore, users put forward higher requirements for the comfort of the air conditioner, and the air conditioner with noise reduction function came into being.

Summary of the invention

On the one hand, an embodiment of the present application provides an air duct machine, including:

A shell, the shell is provided with a return air outlet and an air outlet;

The heat exchanger is arranged in the housing, and the heat exchanger exchanges heat with the air sucked in through the air return port, and discharges the heat-exchanged air through the air outlet;

A fan is arranged in the casing, and the air is introduced from the return air opening by the fan, and then sent out from the air outlet after passing through the heat exchanger;

The air outlet is provided with a noise reduction component, including:

Noise detector, which is used to detect the noise generated when the air duct machine is running;

A noise reducer, which is used to send out a noise reduction signal that is opposite in phase to the noise generated by the air duct machine when the air duct machine is running;

The controller is used to control the noise reducer to emit a noise reduction signal according to the noise generated during the operation of the air duct machine detected by the noise detector.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic diagram of the structure of an air duct machine;

2 is a schematic diagram of the structure of the air duct machine with noise reduction components in an embodiment of the application;

Fig. 3 is a schematic diagram of a three-dimensional structure with an extended air duct added in an embodiment of the application;

Figure 4 is an exploded view of the split-shaped fixed shell, noise reducer and sound-transmitting cover in an embodiment of the application;

Figure 5 is a schematic structural diagram of an additional extension air duct in an embodiment of the application;

Figure 6 is a partial enlarged view of part A in Figure 5;

FIG. 7 is a schematic diagram of the structure of the air duct machine in the embodiment of the application;

8 is a schematic diagram of the arrangement of noise reduction components in an embodiment of the application;

FIG. 9 is a schematic diagram of the arrangement of noise reduction components in an embodiment of the application;

10 is a schematic diagram of the arrangement of noise reduction components in an embodiment of the application;

11 is a schematic diagram of the arrangement of noise reduction components in an embodiment of the application;

FIG. 12 is a schematic diagram of the three-dimensional structure of the air duct machine in the embodiment of the application;

FIG. 13 is a schematic structural diagram with multiple noise reducers in an embodiment of the application;

14 is a schematic diagram of the three-dimensional structure of the noise reducer arranged on the upper side of the extended air duct in the embodiment of the application;

15 is a schematic structural diagram of the noise reducer provided on the upper side of the extended air duct in the embodiment of the application;

16 is a schematic diagram of the three-dimensional structure of the noise reducer arranged on the lower side of the extended air duct in the embodiment of the application;

FIG. 17 is a schematic structural diagram of the noise reducer arranged on the lower side of the extended air duct in an embodiment of the application;

18 is a schematic diagram of the structure of the air duct machine installed in the suspended ceiling in the embodiment of the application;

19 is a schematic diagram of the structure of the extension section of the air outlet of the air duct machine in the embodiment of the application;

20 is a schematic diagram of the acoustic mode shape of the rectangular parallelepiped acoustic cavity in an embodiment of the application;

21 is a schematic diagram of the structure of the extension section of the air outlet of the air duct machine in the embodiment of the application;

22 is a schematic diagram of the structure of the extension section of the air outlet of the air duct machine in the embodiment of the application;

FIG. 23 is a schematic structural diagram of a noise reduction component in an embodiment of the application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be interpreted broadly unless otherwise clearly specified and limited. For example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be mechanically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood under specific circumstances.

The terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the drawings The orientation or positional relationship of is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the application .

The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise specified, "plurality" means two or more.

In the description of this application, "and/or" is only an association relationship describing associated objects, which means that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, and both A and A B, there are three cases of B alone. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

Ducting machine, short for hidden air conditioner, can also be called air-conditioning ducting machine or ducted air conditioning. As the air duct machine solves the problem of hanging the machine and the appearance of the cabinet machine exposed to the outside, the demand is increasing.

Fig. 1 is a schematic diagram of the structure of a duct machine according to some embodiments of the application. 1, the air duct machine 1 is provided with a fan 11 inside. When the fan 11 is running, the noise generated by the operation of the fan 11 and the noise generated by the air flowing in the duct machine duct 12 will be transmitted along the duct machine duct 12 Indoors, thereby affecting people's quality of life.

Figure 2 is a schematic structural diagram of a duct machine with noise reduction components according to some embodiments of the application. FIG. 23 is a schematic structural diagram of a noise reduction component in an embodiment of the application. 2 and 23, the noise reduction component of the air duct machine provided by the embodiment of the present application includes a noise detector 21, a noise reducer 22, a noise error detector 23, and a controller 31. Among them, the noise detector 21, the noise reduction device The noise detector 22 and the noise error detector 23 are both connected to the controller. The noise reducer 22 is located between the noise detector 21 and the noise error detector 23. The controller is used to detect the noise detector 21 according to the first part of the air duct machine 1 A noise signal, which controls the noise reducer 22 to send out a noise reduction signal with the opposite phase to the first noise signal; and adjusts the noise reduction according to the second noise signal in the noise reduction duct machine 1 detected by the noise error detector 23 The noise reduction signal from the device 22.

In some embodiments of the present application, the noise reduction component 2 includes a noise detector 21, a noise reducer 22, a noise error detector 23, and a controller 31, wherein the noise detector 21 and the noise reducer 22 are all connected to the controller 31 connection.

In some embodiments of the present application, when the air duct machine 100 is running, the noise detector 21 can detect the operating noise generated by the air duct machine 100, obtain a first noise signal, and feed back the detected first noise signal to the control According to the first noise signal detected by the noise detector 21, the controller 31 calculates a noise reduction signal with the opposite phase of the first noise signal, and sends it to the noise reducer 22, which sends the noise reduction signal. The signal, the noise generated by the air duct machine 100 and the noise reduction signal can all or partly cancel each other, thereby reducing the final output noise of the air duct machine 100.

In some embodiments of the present application, the noise reduction component 2 includes a noise detector 21, a noise reducer 22, a noise error detector 23, and a controller 31. Among them, the noise detector 21, the noise reducer 22, and the noise error detector 23 are connected to the controller 31.

In some embodiments of the present application, when the air duct machine 100 is running, the noise detector 21 can detect the operating noise generated by the air duct machine 100, obtain a first noise signal, and feed back the detected first noise signal to the controller 31. Based on the first noise signal detected by the noise detector 21, the controller 31 calculates a noise reduction signal with the opposite phase to the first noise signal, and sends it to the noise reducer 22, which sends the noise reduction signal , The noise error detector 23 can detect the operating noise in the air duct machine 100 after noise reduction, obtain a second noise signal, and feed back the detected second noise signal to the controller, and the controller performs processing according to the second noise signal It is judged that the error is less than a certain threshold, and then the noise reduction signal is adjusted, and the adjusted noise reduction signal is sent to the noise reducer for output. Through this adjustment method, the detection error of the noise detector 21 and the signal processing error of the controller 31 are reduced, so that the inverse phase noise reduction signal is more matched with the first noise signal, and the noise reduction of the air duct machine 100 is further improved. effect.

In some embodiments of the present application, the controller in the noise reduction component 2 includes a filter circuit, and the filter circuit can filter the first noise signal detected by the noise detector 21 to obtain the inverse phase reduction of the first noise signal. Noise signal.

In this application, there are many ways to fix each component in the noise reduction assembly 2.

In some embodiments of the present application, the noise reduction component 2 further includes a split-shaped fixed shell 19, and the noise detector 21 is fixed in the end of the split-shaped fixed shell 19 with a smaller cross-sectional area (hereinafter referred to as the front end), and the noise reducer 22 It is installed on the end of the split-shaped fixed shell 19 with a larger cross-sectional area (hereinafter referred to as the rear end), as shown in Figure 3-6.

Compared with the square-shaped fixed shell, the front cross-sectional area of the split-shaped fixed shell 19 is smaller, and the cross-sectional area of the split-shaped fixed shell 19 gradually increases from the front to the back. When the noise reduction component 2 is applied to When the air duct machine and the front end of the split-shaped fixed shell 19 is on the windward side, after the air reaches the front end of the split-shaped fixed shell 19, the front end of the split-shaped fixed shell 19 has little resistance to the air, and the direction of the airflow will not be large. The change of the air flow rate is still relatively fast, and it will not produce large aerodynamic noise, and has a small impact on the wind field in the air duct machine.

In some embodiments of the present application, a plurality of sound-permeable holes 24 are opened on the end of the split-shaped fixed shell 19 with a smaller cross-sectional area, which can make the operating noise of the air duct machine (such as the noise generated by the fan 11 and the air passing through The noise generated by the heater 16) enters the split-shaped fixed shell 19; the split-shaped fixed shell 19 has a first opening 25 at the end with a larger cross-sectional area. The noise reducer 22 is a speaker, and the diaphragm of the noise reducer 22 faces the split On the outside of the fixed shell 19, the speaker can obtain the anti-phase noise signal from the controller, and radiate the anti-phase noise reduction signal corresponding to the anti-phase noise signal into the air.

In some embodiments of the present application, a plurality of sound-transmitting holes 24 are opened on the end of the split-shaped fixed shell 19 with a smaller cross-sectional area, and the five end faces of the end with the smaller cross-sectional area are all open.

In some embodiments of the present application, the opening ratio is 20%-50%, and the opening diameter is greater than 2 mm. In addition to opening holes to increase sound transmission, sound-transmitting and moisture-proof materials can be added around the reference microphone, which can not only perform sound transmission, but also effectively prevent the reference microphone from being damp.

In some embodiments of the present application, the split-shaped fixed shell 19 is provided with openings at the end with a smaller cross-sectional area and the end with a larger cross-section, so that the operating noise of the air duct machine can enter or escape from the split-shaped fixed shell 19 An anti-phase noise reduction signal is transmitted from the split fixed shell 19.

In some embodiments of the present application, the noise reduction assembly 2 further includes a sound-transmitting cover 26 that covers the outside of the diaphragm of the noise reducer 22, and the sound-transmitting cover 26 can reduce water vapor in the air and reduce noise. The diaphragm of the device 22 is in direct contact.

In some embodiments of the present application, the sound-permeable cover 26 and the split-shaped fixed shell 19 are both wrapped with a wind-proof, moisture-proof and sound-permeable material on their ends with a smaller cross-sectional area. The wind-proof, moisture-proof and sound-permeable material can further avoid water vapor in the air. Enter the noise detector 21 and the noise reducer 22 to ensure that the noise detector 21 and the noise reducer 22 can also be used normally in a humid environment.

In some embodiments of the present application, each surface of the sound-transmitting cover 26 is provided with sound-permeable holes 24, and the sound emitted by the noise reducer 22 is transmitted from the sound-permeable holes 24, and the operating noise generated by the air duct machine 100 Cancel each other, thereby reducing noise.

In some embodiments of the present application, the shell shape of the sound-transmitting cover 26 may be square or split, and the shape of the sound-transmitting cover 26 is not specifically limited here.

In some embodiments of the present application, since the wind resistance of the split-shaped sound-transmitting cover is relatively small, the shell of the sound-transmitting cover 26 is set in a split-shape.

In some embodiments of the present application, the wind-proof, moisture-proof and sound-permeable material is any one of melamine foam, oppsello foam, and polyurethane foam, all of which have good sound absorption and flame retardancy. , Heat insulation, humidity and heat stability, etc., not only to ensure that the noise detector 21 and the noise reducer 22 can be used normally in a humid environment, but also to absorb part of the noise generated by the fan 11 and the air passing through the heat exchanger 16, and further Improve the noise reduction effect of noise reduction component 2.

In order to reduce the impact of the noise reduction component 2 on the wind field and avoid the controller from occupying additional space, in some embodiments of the present application, the controller is installed in the split-shaped fixed shell 19, and is located in the noise detector 21 and the noise reduction Between the noise detectors 22, the controller can separate the noise detector 21 and the noise reducer 22 to avoid mutual influence between the two.

Fig. 7 is a schematic diagram of the structure of the air duct machine according to some embodiments of the application. Referring to Fig. 7, the air duct machine 100 includes a housing 13 and the aforementioned noise reduction assembly 2 for the air duct machine installed on the housing 13. The noise reduction assembly 2 is divided into two groups, which are respectively arranged at the

air outlet

15 and 14 air return vents.

Therefore, the noise generated by the air duct machine 100 is reduced after passing through the above-mentioned noise reduction component 2, thereby further reducing the noise generated by the air duct machine 100, and improving the user experience and comfort.

In some embodiments of the present application, the structure of the air duct machine 100 is shown in FIG. 7, including a return air inlet 14 on the housing 13, a fan 11, a noise detector 21a, and a noise reducer 22a are installed in the housing 13 And the noise error detector 23a is installed between the air inlet side of the fan 11 and the return air inlet 14, and the noise detector 21a is located on the side of the noise reducer 22a close to the fan 11, and the noise error detector 23a is located far away from the noise reducer 22a. One side of fan 11.

Since a part of the noise generated by the fan 11 will propagate in the direction of the return air inlet 14, the noise detector 21a is arranged on the side of the noise reducer 22a close to the fan 11, which can detect the noise propagated by the fan 11 towards the return air inlet 14. The noise error detector 23a is arranged on the side of the noise reducer 22a far away from the fan 11, which can detect the noise of the air duct machine 100 after noise reduction for the second time to obtain the second noise signal, and then the detected second noise The signal is fed back to the controller, and the controller adjusts the anti-phase noise reduction signal sent by the noise reducer 22a, so as to reduce the aerodynamic noise in front of the fan 11 and the noise propagated in the direction of the return air outlet.

In some embodiments of the present application, the housing 13 is also provided with an air outlet 15, a fan 11 is installed in the housing 13, and the noise detector 21b, noise reducer 22b, and noise error detector 23b are all mounted on the fan 11. The noise detector 21b is located on the side of the noise reducer 22b close to the fan 11, and the noise error detector 23b is located on the side of the noise reducer 22b away from the fan 11, as shown in Figure 7 , The aerodynamic noise behind the fan 11 and the noise propagated by the fan 11 toward the air outlet are reduced.

It should be noted that “front” refers to the side close to the air return port 14, and “rear” refers to the side close to the air outlet 15. In some embodiments of the present application, the aforementioned noise reduction component includes a first noise reduction component 2a and a second noise reduction component 2b, wherein the first noise reduction component 2a is installed between the air inlet side of the fan 11 and the air return port 14. , The second noise reduction component 2b is installed between the air outlet side of the fan 11 and the air outlet 15, as shown in FIG. 7, that is, noise reduction components are provided at both the return air inlet 14 and the air outlet 15 of the housing 13, for comparison Only set noise reduction components on one side. This solution can not only reduce the aerodynamic noise in front of the fan 11 and the noise transmitted from the fan 11 toward the return air inlet, but also achieve the aerodynamic noise behind the fan 11 and the direction of the fan 11 The noise transmitted in the direction of the tuyere is reduced, and the noise reduction effect is better.

8-11 are schematic diagrams of the arrangement of noise reduction components in some embodiments of the application. In some embodiments of the present application, the noise detector 21, the noise reducer 22, and the noise error detector 23 are all arranged at intervals. Considering the algorithm delay of the controller, when the distance d between the noise detector 21 and the noise reducer 22 is less than 5cm, the distance d between the noise detector 21 and the noise reducer 22 is too short, and the noise reducer 22 has not When it is too late to receive the anti-phase noise reduction signal from the controller and send out the anti-phase noise reduction signal, the noise generated by the fan 11 and the noise of the air passing through the heat exchanger 16 have been transmitted to the noise error detector 23, which cannot be realized. Active noise reduction; when the distance d between the noise detector 21 and the noise reducer 22 is greater than 30 cm, the geometric size of the noise reduction component is too large, which may cause it to be unable to be installed in the air duct machine.

In some embodiments of the present application, it is appropriate to control the distance d between the noise detector 21 and the noise reducer 22 in the range of 5 cm to 30 cm, including 5 cm and 30 cm.

In some embodiments of the present application, a heat exchanger 16 is also installed in the housing 13. The heat exchanger 16 can be installed between the air inlet side of the fan 11 and the air return port 14, or can be installed at the air outlet of the fan 11. Between the side and the air outlet 15. In order to achieve different noise reduction effects, the noise reduction component 2 has multiple arrangements relative to the fan 11 and the heat exchanger 16. Taking the heat exchanger 16 arranged between the air outlet side of the fan 11 and the air outlet 15 as an example, several arrangements of the heat exchanger 16 at different positions relative to the noise reduction assembly 2 are listed below.

Referring to Figure 8, the heat exchanger 16 is located between the fan 11 and the noise detector 21, that is, the noise detector 21 is arranged on the low pressure side of the heat exchanger, and the noise detector 21 can detect the noise and the noise generated by the fan 11 The aerodynamic noise generated after the heat exchanger 16 is reduced by the noise reducer 22 for the noise generated by the fan 11 and the aerodynamic noise generated by the heat exchanger 16 to obtain a better noise reduction effect.

Referring to Figure 9, the heat exchanger 16 is located between the noise detector 21 and the noise reducer 22. The noise detector 21 can detect the noise generated by the fan 11 and the aerodynamic noise in front of the heat exchanger 16, and the noise reducer 22 The noise generated by the fan 11 and the aerodynamic noise in front of the heat exchanger 16 are all reduced to achieve a better noise reduction effect, and reduce the influence of the noise reduction component 2 on the wind field behind the heat exchanger 16, which is suitable for heat exchange The situation where the aerodynamic noise generated after the device 16 is relatively low.

Refer to Figure 10 and the heat exchanger 16 is located between the noise reducer 22 and the noise error detector 23, as shown in Figure 10; compared to the second arrangement, the noise detector 21 and the noise reducer 22 are both moved forward On the high pressure side of the heat exchanger, the air flow blown out of the heat exchanger only needs to pass through the noise error detector 23, thereby further reducing the influence of the noise reduction component 2 on the wind field. In addition, the above-mentioned noise reducer 22 may also be arranged on the upper side of the inner wall of the duct 12, or the noise reducer 22 may also be arranged on the lower side of the inner wall of the duct 12, which is not specifically limited herein.

11, the noise detector 21 includes a first noise detector 21a and a second noise detector 21b. The second noise detector 21b is located between the first noise detector 21a and the noise reducer 22, and the heat exchanger 16 is located on the Between a noise detector 21a and a second noise detector 21b; when the fan 11 is running, the first noise detector 21a is used to detect the noise generated by the fan 11 itself, and the second noise detector 21b is used to detect air passing through the fan 11 The noise generated by itself and the noise generated by the heat exchanger 16, the noise detected by the first noise detector 21a and the second noise detector 21b are all fed back to the controller, so that the noise reducer 22 can simultaneously reduce the generation of the fan 11 The noise and the noise generated by the air passing through the heat exchanger 16, the detection result is more accurate, and the noise reduction effect is better.

It should be noted that the high-pressure side of the heat exchanger 16 refers to the side of the heat exchanger 16 close to the fan 11, and the low-pressure side of the heat exchanger 16 refers to the side of the heat exchanger 16 away from the fan 11. Of course, for the solution where the heat exchanger 16 is installed between the air inlet side of the fan 11 and the air return port 14, the noise detector 21, the noise reducer 22, and the noise error detector 23 can be symmetrically distributed with the above arrangement. This will not repeat them one by one.

In some embodiments of the present application, in order to achieve a better noise reduction effect, the number of noise detectors 21, noise reducers 22, and noise error detectors 23 in the noise reduction component 2 can be determined according to the effect of noise reduction experiments. , Can be one or more. In some embodiments of the present application, the number of noise detectors 21 can be 2-8, the number of noise reducers 22 can be 2-6, and the number of noise error detectors 23 can be 2-10. The noise error detector may not be provided; the specific numbers of the noise detector 21, the noise reducer 22 and the noise error detector 23 are not specifically limited here.

Fig. 12 is a schematic diagram of a three-dimensional structure of a duct machine according to some embodiments of the application. Referring to Figure 12, the length direction of the housing 13 refers to the X direction in Figure 12, the width direction of the housing 13 refers to the Y direction in Figure 12, and the height direction of the housing 13 refers to the Z in Figure 12 direction. The multiple noise reducers 22 may be arranged at intervals along the width direction of the housing 13, or may be arranged at intervals along the height direction of the housing 13, or the multiple noise reducers 22 are located in the same section in the X direction and surround the housing The inner walls of 13 are arranged at intervals in the circumferential direction. Specifically, as shown in FIG. 13, the number n of noise reducers 22 is multiple, and the multiple noise reducers 22 are arranged at intervals along the width direction of the housing 13.

In some embodiments of the present application, compared with the noise reducer 22, the number of noise detectors 21 can be larger, and can detect noise signals in different areas in the housing 13, so that the detection result is more accurate, and the controller obtains the feedback The phase noise reduction signal is more matched with the first noise signal, and the noise reduction effect is better.

In some embodiments of the present application, the number of noise error detectors 23 is larger than that of noise detectors 21.

In some embodiments of the present application, in order to achieve the noise reduction effect, the noise detector 21, the noise reducer 22, and the noise error detector 23 in the noise reduction component 2 need to be arranged at intervals. For the solution in which the heat exchanger 16 is arranged between the fan 11 and the noise detector 21, that is, the noise reduction components 2 are located between the fan 11 and the air outlet 15, and the distance between the fan 11 and the air outlet 15 needs to be large, so that The solution of the foregoing embodiment is only applicable to the air duct machine 100 with a large distance between the fan 11 and the air outlet 15.

In some embodiments of the present application, in order to expand the application range of the noise reduction component, as shown in FIGS. 3-6, for the air duct machine with a small distance between the fan 11 and the air outlet 15, the air outlet 15 is An extended air duct 18 is installed, and a noise detector 21 and a noise reducer 22 are installed on the extended air duct 18.

In some embodiments of the present application, the noise reduction assembly 2 further includes a mounting bracket 27 that connects the noise detector 21 to the housing 13. As shown in FIGS. 14-15, the structure of the mounting bracket 27 is relatively simple, so that The impact on the wind field of the duct machine is small.

In some embodiments of the present application, in order to further reduce the impact of the noise reduction component 2 on the wind field, as shown in FIGS. 14-15, the noise reducer 22 is fixed on the outside of the housing 13, and the vibration of the noise reducer 22 The membrane communicates with the inside of the housing 13.

In some embodiments of the present application, the noise reducer 22 is arranged on the upper side of the housing 13, and the diaphragm of the noise reducer faces downwards, as shown in FIGS. 14-15; or the noise reducer 22 is arranged on the upper side of the housing 13 On the lower side, the diaphragm of the noise reducer 22 faces upward, as shown in FIGS. 16-17; or the noise reducer 22 is arranged on the left side of the housing 13, and the diaphragm of the noise reducer 22 faces right; or the noise reducer 22 It is arranged on the right side of the housing 13, with the diaphragm of the noise reducer 22 facing left; or there are multiple noise reducers 22, and the multiple noise reducers 22 are on any two sides, any three sides or four sides of the housing 13, respectively For the arrangement, the specific position of the noise reducer 22 is not limited, as long as the diaphragm of the noise reducer 22 faces the inner side of the housing 13 and communicates with the inner side of the housing 13.

In some embodiments of the present application, in order to realize the installation of the air duct machine 100, a suspended ceiling 200 is provided on the ceiling of the room, and the entire air duct machine housing 13 is installed in the suspended ceiling 200, and the suspended ceiling 200 is provided with a housing The ceiling air return 28 corresponding to the air return 14 and the ceiling air outlet 29 corresponding to the housing air outlet 15 are installed with a grille 17 on both the ceiling return air 28 and the ceiling air outlet 29.

In some embodiments of the present application, if the noise reduction component 2 is provided with a noise error detector 23, the noise error detector 23 is installed at the air outlet 15 of the housing 13; or the noise error detector 23 is installed at the air outlet of the ceiling 29 on the grille 17 as shown in Figure 18.

In some embodiments of the present application, the noise error detector 23 may also be fixed on the grille 17 of the air outlet 29 of the ceiling by a mounting bracket. Regarding the above-mentioned solution of fixing the noise detector 21 and the noise error detector 23 in the air duct in the housing through the mounting bracket, the noise detector 21 and the noise error detector 23 are both wrapped with wind-proof, moisture-proof and sound-permeable materials, thus ensuring the The noise detector 21 and the noise error detector 23 can be used normally in a humid environment.

In some embodiments of the present application, as shown in Figures 3, 4 and 23, an extended air duct 18 is provided at the air outlet 15 of the air duct machine 100, and a noise reduction component 2 is provided on the extended air duct 18 to reduce The noise component 2 includes a noise detector 21, a noise reducer 22 and a controller 31, and the noise detector 21 is located at the smaller end of the noise reduction component 2.

In some embodiments of the present application, as shown in FIG. 19, the size range of the air duct 18 is extended, with a value ranging from 40 mm to 200 mm; b value ranging from 10 mm to 2000 mm; and c value ranging from 50 mm to 2000 mm.

In some embodiments of the present application, because the structure of the duct machine is a duct type, the noise generated by the fan mainly propagates along the duct to the direction of the air outlet. The duct sound cavity type of the duct machine improves the active noise reduction of the duct machine. Feasibility. However, due to the large size of the air duct machine frame, the overall duct acoustic cavity still has a more complicated acoustic cavity mode, which increases the complexity of noise propagation and the calculation difficulty of noise propagation prediction, and limits the ability of active noise reduction The processed noise bandwidth.

FIG. 20 is a schematic diagram of the acoustic mode shape of the rectangular parallelepiped acoustic cavity according to some embodiments of the application. As shown in FIG. 20, the acoustic mode shape can be described by a combination of longitudinal, lateral, vertical or different directions, such as longitudinal first The first-order mode sound pressure mainly extends longitudinally, and the sound pressure does not change in other directions. The acoustic cavity mode frequency can be calculated by the following formula:

Among them, Lx, Ly, Lz are the longitudinal, lateral, and vertical acoustic cavity dimensions respectively, c is the speed of sound, i(0,1,2...), j(0,1,2...), k(0 ,1,2...) respectively represent the order of the modes in the three directions. Through formula calculation, the theoretical frequency value of the acoustic cavity mode combined in the longitudinal, lateral, vertical or different directions can be obtained, and the geometric size of the acoustic cavity Decrease can increase the frequency value of the acoustic cavity mode.

Based on the above theory, the smaller the geometric size of the air outlet acoustic cavity of the duct machine, the simpler the acoustic cavity mode, and the closer it is to the duct acoustic cavity; and the higher the frequency of the first-order acoustic cavity mode, the frequency band that can be processed by active noise reduction The greater the width.

FIG. 21 is a schematic diagram of the structure of the air outlet extension section of the air duct machine in some embodiments of the application. As shown in Figure 21, the air duct extension 18 is divided by a partition plate 30, and each sound cavity of the pipe is arranged with a noise reducer separately, and each sound cavity can share a set of active noise reduction control system, which can significantly improve the activity of the duct machine. Noise reduction effect and noise reduction bandwidth of the noise reduction system.

In some embodiments of the present application, as shown in FIG. 21, the number of divided air duct extension sections 18 is not limited to the number of divisions. In FIG. 21, it is divided into 3, and it can also be divided into N pieces as shown in FIG. 22 (where the dimension d is 5mm～500mm) The partition plate 30 can be installed together with the air duct extension 18 as a separate part, or can be made into one part with the air duct extension 18; in addition, the angle of the partition plate 30 is limited to 0°-60°.

In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, All should be covered in the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

An air duct machine is characterized in that it comprises:

A shell, the shell is provided with a return air outlet and an air outlet;

The heat exchanger is arranged in the housing, and the heat exchanger exchanges heat with the air sucked in through the air return port, and discharges the heat-exchanged air through the air outlet;

A fan is arranged in the casing, and the air is introduced from the return air opening by the fan, and then sent out from the air outlet after passing through the heat exchanger;

The air outlet is provided with a noise reduction component, including:

Noise detector, used to detect the noise generated during the operation of the air duct machine;

A noise reducer, which is used to send out a noise reduction signal in the opposite phase to the noise generated by the air duct machine when the air duct machine is running;

The controller is used for controlling the noise reducer to send out a noise reduction signal according to the noise generated during the operation of the air duct machine detected by the noise detector.
The air duct machine according to claim 1, wherein the noise reduction component further comprises a split-shaped shell, and the noise detector is fixed in an end of the split-shaped shell with a smaller cross-sectional area. The noise reducer is installed on the end of the split-shaped shell with a larger cross-sectional area.
An air duct machine according to claim 2, wherein the split-shaped shell is provided with a plurality of sound-permeable holes at one end with a smaller cross-sectional area, and the split-shaped shell has a larger end with a larger cross-sectional area. There is a first opening, the noise reducer is a loudspeaker, and the diaphragm of the noise reducer faces the outside of the split-shaped housing.
The air duct machine according to claim 3, wherein the noise reduction component further comprises a sound-transmitting cover, the sound-transmitting cover is closed on the outside of the diaphragm of the noise reducer, and the transparent The sound cover and the end of the split-shaped shell with a smaller cross-sectional area are both wrapped with windproof and moisture-proof sound-permeable materials.
The air duct machine of claim 4, wherein the controller is installed in the split-shaped housing.
The air duct machine according to claim 1, wherein the noise reduction component further comprises a noise error detector, and the noise error detector can detect the noise reduced by the noise reducer, so The controller can adjust the noise reduction signal emitted by the noise reducer according to the noise detected by the noise error detector.
The air duct machine according to claim 6, wherein the noise error detector is arranged on the grille of the air outlet of the air duct machine.
The air duct machine according to claim 3, wherein the opening ratio of the end of the split-shaped shell with the smaller cross-sectional area ranges from 20% to 50%.
The air duct machine according to claim 3, wherein the diameter of the opening of the sound transmission hole is greater than 2 mm.
The air duct machine according to any one of claims 1-9, wherein the air outlet is provided with an extension section, and the extension section is provided with the noise reduction component.
The air duct machine according to any one of claims 1-5, wherein the noise reduction component is provided at the air return port of the air duct machine.
The air duct machine according to claim 10, wherein the inner wall of the extension section is provided with sound-absorbing cotton, and the sound-absorbing cotton can be used to absorb noise at the air outlet of the air duct machine.