Noise reduction device, compressor assembly, fan assembly and air conditioning unit

Abstract

The utility model provides a noise reduction device, a compressor assembly, a fan assembly and an air conditioning unit. The noise reduction device comprises a plate body; a structure to be subjected to noise reduction is arranged in the noise reduction cavity; a through hole is formed in the plate body. According to the noise reduction device, the compressor assembly, the fan assembly and the air conditioning unit, the noise reduction cavity is formed through the plate body to completely wrap the structure to be subjected to noise reduction, noise generated by the structure to be subjected to noise reduction needs to be completely transmitted through the through holes in the plate body, and the noise reduction effect is achieved through the size change of the through holes. The noise can generate different amplitudes and different frequencies due to the change of the flow area in the transmission process, so that the noise is further consumed and counteracted to reduce the noise value, the energy of the noise is prevented from being partially discharged out of the noise reduction device by utilizing the outflow section, the generation of low-frequency noise is avoided, and the noise reduction effect of the noise reduction device is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of silencing, in particular to a noise reduction device, a compressor assembly, a fan assembly and an air conditioning unit. Background Art

[0002] When the existing air conditioner outdoor unit is in operation, the compressor and the fan will vibrate during the operation, and this vibration will cause the compressor and the fan to generate noise.

[0003] Taking the compressor of the air conditioner outdoor unit as an example, in order to reduce the noise generated by the compressor during operation, the method adopted in the prior art is to install a sound insulation cover on the outside of the compressor. The sound insulation cover roughly matches the shape of the compressor, which can not only achieve the sound insulation effect, but also minimize the increase in the space occupied by the compressor assembly.

[0004] However, the soundproof cover in the prior art is a cover body with a layer of soundproof cotton attached to the inner wall wrapped around the outer layer of the compressor, and the soundproof cotton is used to reduce the transmission of noise and consume the energy of vibration. Although this kind of soundproof cover can play a certain role in reducing noise, it still has the following technical problems: 1. The material of the soundproof cotton is single, and the frequencies of noises generated by different types and models of compressors are different, resulting in poor noise reduction effect on the compressor; 2. Since the soundproof cover completely encloses the compressor, the noise generated by the compressor cannot be completely consumed, so that the high-frequency noise of the compressor will be consumed and low-frequency noise will be generated in the soundproof cover, so that there is still noise when the air-conditioning outdoor unit is running, that is, the soundproof cover in the prior art still has the problem of poor noise reduction effect. Utility Model Content

[0005] In order to solve the technical problem of poor noise reduction effect of the sound insulation cover in the prior art, a noise reduction device, a compressor assembly, a fan assembly and an air-conditioning unit are provided, which utilize the shape change of the through hole to consume the noise through friction and expansion and finally discharge it to the outside of the silencer chamber to improve the noise reduction effect.

[0006] A noise reduction device, comprising:

[0007] A plate body, wherein the plate body forms a sound-absorbing cavity for placing a structure to be noise-reduced;

[0008] The structure to be noise-reduced is arranged in the silencing cavity;

[0009] A through hole is formed on the plate body, and the through hole includes an inlet section, a middle section and an outlet section which are connected in sequence, the inlet section is connected to the muffler cavity, and the outlet section is connected to the outside of the plate body;

[0010] The flow area of ​​the inflow section is smaller than the flow area of ​​the middle section; and / or the flow area of ​​the outflow section is smaller than the flow area of ​​the middle section.

[0011] The cross-sectional shape of the inlet section is circular, square, rectangular or trapezoidal; and / or the cross-sectional shape of the middle section is circular, square, rectangular or trapezoidal; and / or the cross-sectional shape of the outlet section is circular, square, rectangular or trapezoidal.

[0012] The shape of the through hole is determined according to the following formula:

[0013] f0=(c / 2π)(S0 / (V1(L0+0.82 / d0)))1 / 2;

[0014] Among them, f0 is the operating frequency of the structure to be noise reduced; c is the propagation speed of sound; S0 is the flow area of ​​the connecting end between the inlet section and the silencer chamber; V1 is the volume of the middle section; L0 is the length of the inlet section; d0 is the width of the inlet section.

[0015] The shape of the inflow section is the same as the shape of the outflow section.

[0016] The plate body comprises:

[0017] An inner noise reduction plate, wherein the inner noise reduction plate is bent to form the silencer cavity; or, at least two inner noise reduction plates together enclose the silencer cavity, and the inner noise reduction plate is provided with the inflow section;

[0018] A middle layer noise reduction plate, wherein the middle layer noise reduction plate is arranged on the outer wall of the inner layer noise reduction plate, and the middle section is formed on the middle layer noise reduction plate;

[0019] The outer noise reduction plate is arranged on the outer wall of the middle noise reduction plate, and the outflow section is formed on the outer noise reduction plate.

[0020] The material of the plate body includes sponge.

[0021] A compressor assembly comprises a compressor and the above-mentioned noise reduction device, wherein the compressor is arranged in the muffler cavity.

[0022] The compressor assembly also includes a shell, the compressor is arranged in the shell, and the noise reduction device is adhered to the inner wall of the shell.

[0023] A fan assembly comprises a fan and the above-mentioned noise reduction device, wherein the fan is arranged in the silencing chamber.

[0024] An air conditioning unit comprises the above-mentioned noise reduction device or the above-mentioned noise reduction device or the above-mentioned fan assembly.

[0025] The noise reduction device, compressor assembly, fan assembly and air-conditioning unit provided by the utility model utilize a plate body to form a silencer cavity to completely wrap up the structure to be noise reduced, so that the noise generated by the structure to be noise reduced needs to be completely transmitted through the through holes on the plate body, and the noise will be consumed by friction with the hole walls of the through holes during the transmission process, and the energy of the noise will be converted into heat energy, thereby ensuring the noise reduction effect of the noise reduction device, and utilizing the size change of the through holes, the noise will generate different amplitudes and different frequencies during the transmission process due to the change of the flow area, thereby further consuming and offsetting the noise to reduce the noise value, and utilizing the outflow section to prevent the energy of the noise from being partially discharged from the noise reduction device, thereby avoiding the generation of low-frequency noise and ensuring the noise reduction effect of the noise reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a noise reduction device provided in an embodiment of the utility model;

[0027] Figure 2 A front view of a noise reduction device provided by an embodiment of the utility model;

[0028] Figure 3 A cross-sectional view of a noise reduction device provided by an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the structure of a through hole of a noise reduction device provided in an embodiment of the utility model;

[0030] Figure 5 A comparison spectrum diagram of a compressor not provided with the noise reduction device provided in the embodiment of the present application and a compressor provided with the noise reduction device provided in the embodiment of the present utility model;

[0031] In the figure:

[0032] 1. Plate body; 2. Through hole; 21. Inflow section; 22. Middle section; 23. Outflow section; 11. Inner noise reduction plate; 12. Middle noise reduction plate; 13. Outer noise reduction plate. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The soundproof cover in the prior art is a cover body with a layer of soundproof cotton attached to the inner wall wrapped around the outer layer of the compressor. The soundproof cotton is used to reduce the transmission of noise and consume the energy of vibration. Although this type of soundproof cover can reduce noise to a certain extent, it still has the following technical problems: 1. The material of the soundproof cotton is single, and the frequencies of noises generated by different types and models of compressors are different, resulting in poor noise reduction effect on the compressor; 2. Since the soundproof cover completely encloses the compressor, the noise generated by the compressor cannot be completely consumed, so that the high-frequency noise of the compressor will be consumed and low-frequency noise will be generated in the soundproof cover, so that there is still noise when the air conditioner outdoor unit is running, that is, the soundproof cover in the prior art still has the problem of poor noise reduction effect. To this end, the present application provides a Figures 1 to 5 The noise reduction device shown includes: a plate body 1, the plate body 1 enclosing a silencer cavity for placing the structure to be noise reduced; for example, the plate body 1 is bent to enclose a silencer cavity, and the structure to be noise reduced is arranged in the silencer cavity; the structure to be noise reduced is arranged in the silencer cavity; a through hole 2 is formed on the plate body 1, and the through hole 2 includes an inlet section 21, an intermediate section 22 and an outlet section 23 connected in sequence, the inlet section 21 is connected to the silencer cavity, and the outlet section 23 is connected to the outside of the plate body 1. By bending the plate body 1, a completely closed silencing cavity is formed on the plate body 1, so that the noise reduction structure can be completely wrapped, so that the noise generated by the noise reduction structure needs to be completely transmitted through the through hole 2 on the plate body 1, and the noise will be consumed by friction with the hole wall of the through hole 2 during the transmission process, and the energy of the noise will be converted into heat energy, thereby ensuring the noise reduction effect of the noise reduction device; the flow area of ​​the inlet section 21 is smaller than the flow area of ​​the middle section 22, and the size change of the through hole 2 is used. During the transmission process, the noise will produce different amplitudes and different frequencies due to the change of the flow area, thereby further consuming and offsetting the noise to reduce the noise value, and the outflow section 23 is used to prevent the energy of the noise from being partially discharged from the noise reduction device, thereby avoiding the generation of low-frequency noise and ensuring the noise reduction effect of the noise reduction device. When using the noise reduction device, the plate body 1 can be bent according to the shape of the noise reduction structure to be reduced, so that when the silencing cavity cover formed by the plate body 1 is set on the noise reduction structure to be reduced, the plate body 1 can fit on the noise reduction structure to be reduced, and the space occupied by the noise reduction device is reduced under the premise of ensuring the noise reduction effect. like Figure 5 As shown in the figure, the line with point A is the noise spectrum of the compressor when the noise reduction device of the present application is not set; the line with point B is the noise spectrum of the compressor when the noise reduction device of the present application is set. Figure 5 It can be seen that the noise reduction device of the present application can effectively reduce the noise by 8dB, effectively reducing the noise generated during the operation of the compressor.

[0039] Furthermore, the flow area of ​​the outflow section 23 is smaller than the flow area of ​​the middle section 22. By utilizing the change in the flow area of ​​the outflow section 23 and the middle section 22, the transmission of noise again generates different amplitudes and different frequencies, further consuming and offsetting the noise to reduce the noise value, thereby further ensuring the noise reduction effect of the noise reduction device.

[0040] As another embodiment, when forming the silencer cavity, at least two of the plates 1 are joined together to enclose the silencer cavity, that is, the plates 1 are not bent but connected by joining together. Compared with the previous embodiment, there is a problem of noise leakage in the gaps between the joined plates 1, but the shape of the through hole 2 on the plate 1 is prevented from changing due to bending, thereby ensuring the noise reduction effect of the noise reduction device. At the same time, when in use, plates 1 of corresponding shapes can be arranged on different side walls of the structure to be noise reduced, thereby ensuring complete wrapping of the structure to be noise reduced and improving the noise reduction effect. Taking the compressor as an example, a connecting pipe is arranged on the upper end face of the compressor. At this time, at least two plates 1 can be arranged on the upper end face of the compressor for joining together, and a through hole for the connecting pipe to pass through can be formed on the corresponding plate 1, thereby reliably wrapping the upper end face of the compressor and improving the noise reduction effect of the compressor.

[0041] The cross-sectional shape of the inlet section 21 is circular, square, rectangular or trapezoidal. The shape of the inlet section 21 can be selected according to the overall shape of the plate body 1 and the frequency range of the noise it faces, so as to ensure that the noise can fully rub against the hole wall during the transmission process through the inlet section 21 and convert the sound energy into heat energy and be consumed, thereby achieving the purpose of reducing noise.

[0042] Similarly, the cross-sectional shape of the middle section 22 is circular, square, rectangular or trapezoidal. The shape of the middle section 22 can be selected according to the overall shape of the plate body 1 and the frequency range of the noise it faces, so as to ensure that the noise is effectively expanded in the process of passing through the inflow section 21 to the middle section 22, thereby achieving the purpose of reducing noise.

[0043] Similarly, the cross-sectional shape of the outflow section 23 is circular, square, rectangular or trapezoidal. The shape of the outflow section 23 can be selected according to the overall shape of the plate body 1 and the frequency range of the noise it faces. After the noise is consumed by the middle section 22, the outflow section 23 can further consume the noise, thereby minimizing the noise energy transmitted to the outside of the noise reduction device and improving the noise reduction effect of the noise reduction device.

[0044] The shapes of the flow area at the inlet end, the flow area at the middle section 22 and the flow area at the outlet section 23 may be the same or different.

[0045] The shape of the through hole 2 is determined according to the following formula:

[0046] f0=(c / 2π)(S0 / (V1(L0+0.82 / d0)))1 / 2;

[0047] Among them, f0 is the operating frequency of the structure to be noise reduced; c is the propagation speed of sound; S0 is the flow area of ​​the connecting end between the inlet section 21 and the silencer cavity; V1 is the volume of the middle section 22; L0 is the length of the inlet section 21; d0 is the width of the inlet section 21.

[0048] When designing the through hole 2, the frequency of the noise to be reduced is first determined, that is, f0 is first determined, and then d0 and L0 are assigned values, and finally V1 and S0 are calculated, and then the specific value of the through hole 2 is determined based on V1 and S0.

[0049] Preferably, the shape of the inlet section 21 is the same as the shape of the outlet section 23, so as to reduce the processing difficulty of the plate body 1 and improve the production efficiency.

[0050] As an embodiment, the plate body 1 includes: an inner noise reduction plate 11, the inner noise reduction plate 11 is bent to form the silencer cavity; the inner noise reduction plate 11 is formed with the inflow section 21; a middle noise reduction plate 12, the middle noise reduction plate 12 is arranged on the outer wall of the inner noise reduction plate 11, and the middle section 22 is formed on the middle noise reduction plate 12; and an outer noise reduction plate 13, the outer noise reduction plate 13 is arranged on the outer wall of the middle noise reduction plate 12, and the outer noise reduction plate 13 is formed with the outflow section 23. When forming the plate body 1, the inner noise reduction plate 11, the middle noise reduction plate 12 and the outer noise reduction plate 13 are processed respectively, and the inflow section 21 on the inner noise reduction plate 11, the middle section 22 on the middle noise reduction plate 12 and the outflow section 23 on the outer noise reduction plate 13 are connected to each other correspondingly, so as to realize the formation of each through hole 2.

[0051] As another embodiment, at least two of the inner noise reduction plates 11 together form the silencer cavity, and at this time, the corresponding middle noise reduction plates 12 are connected to each other, and the corresponding outer noise reduction plates 13 are connected to each other, thereby realizing the mutual connection of the plate bodies 1 and achieving reliable wrapping of the noise reduction structure to ensure the noise reduction effect.

[0052] The material hardness of the plate body 1 is relatively small, thereby avoiding hard contact and collision between the plate body 1 and the structure to be noise-reduced to generate additional noise, thereby ensuring the noise reduction effect of the noise reduction device. For example, the material of the plate body 1 includes sponge.

[0053] A compressor assembly includes a compressor and the above-mentioned noise reduction device, wherein the compressor is arranged in the muffler cavity. At this time, the compressor constitutes a structure to be noise-reduced, and the noise generated by the compressor during operation can be consumed and absorbed by the noise reduction device, thereby effectively reducing the noise of the compressor.

[0054] When designing the shape of the through hole 2, first determine the operating frequency of the compressor, for example, 15 to 100 Hz, then determine that the noise frequency generated by the compressor is 1 to 15 times the operating frequency of the compressor, and then determine the noise reduction frequency required by the noise reduction device. Then, the specific shape of the through hole 2 can be determined according to the above formula.

[0055] The compressor assembly also includes a housing, the compressor is disposed in the housing, and the noise reduction device is adhered to the inner wall of the housing. Since the noise reduction device can be adhered to the housing, the noise reduction effect can be achieved without increasing the overall size of the compressor in the prior art. Preferably, the housing is provided with through holes corresponding to the through holes one by one, so as to ensure that the noise can be smoothly transmitted to the outside of the housing and avoid the generation of low-frequency noise.

[0056] A fan assembly includes a fan and the above-mentioned noise reduction device, wherein the fan is arranged in the muffler chamber. The fan will also generate noise during rotation, and the noise reduction device can be arranged on the outer wall of the fan to reduce noise, wherein the noise frequency generated by the fan can be determined according to the following formula:

[0057] f=(n1*V / 60)*n;

[0058] Where f is the noise frequency of the fan; n1 is the number of impeller heads; V is the fan speed; n is the frequency multiple. For example, if n1 is 3 and V is 600r / min, then f = (3*600 / 60)*n, where n can be any integer greater than zero, such as 1, 2, 3, etc.

[0059] An air conditioning unit comprises the above-mentioned noise reduction device or the above-mentioned noise reduction device or the above-mentioned fan assembly.

[0060] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A noise reduction device, characterized in that: include: A plate body (1), the plate body (1) enclosing a sound-absorbing cavity for placing a structure to be noise-reduced; A through hole (2) is formed on the plate body (1), the through hole (2) comprising an inlet section (21), an intermediate section (22) and an outlet section (23) which are connected in sequence, the inlet section (21) being connected to the muffler cavity, and the outlet section (23) being connected to the outside of the plate body (1); The flow area of ​​the inlet section (21) is smaller than the flow area of ​​the middle section (22); and / or the flow area of ​​the outlet section (23) is smaller than the flow area of ​​the middle section (22).

2. The noise reduction device according to claim 1, characterized in that: The cross-sectional shape of the inlet section (21) is circular, square, rectangular or trapezoidal; and / or the cross-sectional shape of the middle section (22) is circular, square, rectangular or trapezoidal; and / or the cross-sectional shape of the outlet section (23) is circular, square, rectangular or trapezoidal.

3. The noise reduction device according to claim 1, characterized in that: The shape of the through hole (2) is determined according to the following formula: f0=(c / 2π)(S0 / (V1(L0+0.82 / d0)))1 / 2; Wherein, f0 is the operating frequency of the structure to be noise-reduced; c is the propagation speed of sound; S0 is the flow area of ​​the connecting end between the inlet section (21) and the silencer chamber; V1 is the volume of the middle section (22); L0 is the length of the inlet section (21); and d0 is the width of the inlet section (21).

4. The noise reduction device according to claim 1, characterized in that: The shape of the inflow section (21) is the same as the shape of the outflow section (23).

5. The noise reduction device according to claim 1, characterized in that: The plate body (1) comprises: an inner noise reduction plate (11), wherein the inner noise reduction plate (11) is bent to form the silencer cavity; or, at least two inner noise reduction plates (11) together enclose the silencer cavity, and the inner noise reduction plate (11) is provided with the inflow section (21); A middle layer noise reduction plate (12), wherein the middle layer noise reduction plate (12) is arranged on the outer wall of the inner layer noise reduction plate (11), and the middle section (22) is formed on the middle layer noise reduction plate (12); An outer noise reduction plate (13), wherein the outer noise reduction plate (13) is arranged on the outer wall of the middle noise reduction plate (12), and the outflow section (23) is formed on the outer noise reduction plate (13).

6. The noise reduction device according to claim 1, characterized in that: The material of the plate body (1) includes sponge.

7. A compressor assembly, characterized in that: The invention comprises a compressor and the noise reduction device according to any one of claims 1 to 6, wherein the compressor is arranged in the silencing chamber.

8. The compressor assembly according to claim 7, characterized in that: The compressor assembly also includes a shell, the compressor is arranged in the shell, and the noise reduction device is adhered to the inner wall of the shell.

9. A fan assembly, characterized in that: The noise reduction device comprises a fan and any one of claims 1 to 6, wherein the fan is arranged in the silencing chamber.

10. An air conditioning unit, characterized in that: The invention comprises the noise reduction device according to any one of claims 1 to 6 or the noise reduction device according to any one of claims 7 to 8 or the fan assembly according to claim 9.

Images