Range hood

Abstract

The range hood comprises a shell, a fan assembly arranged in the shell, and an exhaust fume collecting hood arranged below the shell, the dynamic vibration absorption assembly is arranged on the exhaust fume collecting hood and used for balancing exciting force which causes vibration of the exhaust fume collecting hood when the fan assembly is in a working state so as to reduce vibration of the exhaust fume collecting hood, the dynamic vibration absorption assembly comprises a mass unit and an elastic unit, and the two ends of the elastic unit are connected with the mass unit and the exhaust fume collecting hood respectively. According to the range hood, the dynamic vibration absorption assembly is arranged on the exhaust fume collecting hood, vibration caused by unbalanced mass of the fan assembly can be reduced, the shaking phenomenon of the exhaust fume collecting hood of the range hood is remarkably improved, and then shaking of a control panel of the range hood is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a range hood. Background Art

[0002] With the development of science and technology and the improvement of people's living standards, people's requirements for range hoods are no longer limited to extracting oil fumes. Vibration and noise have also become important performance parameters of range hoods. For range hoods, excessive vibration and noise will cause discomfort to consumers, affecting their user experience and satisfaction.

[0003] A touch screen and / or display screen is provided on the range hood control panel to control the range hood and display the operating status information of the range hood. When the range hood is running, low-frequency vibration will be generated, causing the range hood control panel to vibrate. When the range hood control panel vibrates too much, the user may feel a strong vibration on the touch screen, and the display content may be blurred.

[0004] At present, the main solutions to the range hood jitter are: reducing the unbalanced mass of the fan system during product design, but the fan system needs to pass a strict dynamic balance test; or, after the range hood has been working for a period of time, the impeller needs to be disassembled and cleaned of oil to reduce the jitter of the range hood as a whole; or, designing a range hood cavity with greater rigidity, which will increase the mass and cost of the range hood as a whole.

[0005] Therefore, a range hood with a more effective vibration reduction design is needed to solve the above problems. Utility Model Content

[0006] The embodiment of the utility model provides a range hood, which can more effectively reduce the vibration of the range hood, especially reduce the vibration of the control panel arranged on the range hood.

[0007] The utility model provides a range hood, comprising: a casing, a fan assembly arranged in the casing, and a smoke hood arranged below the casing; and also comprising: a dynamic vibration absorption assembly, arranged in the smoke hood, for balancing the exciting force of the smoke hood caused by the fan assembly in a working state to reduce the vibration of the smoke hood, wherein the dynamic vibration absorption assembly comprises a mass unit and an elastic unit, and two ends of the elastic unit are respectively connected to the mass unit and the smoke hood.

[0008] In a possible embodiment, the dynamic vibration absorbing component is constructed such that its natural frequency is equal to or close to the exciting force frequency, wherein the natural frequency of the dynamic vibration absorbing component is related to its mass M2 and stiffness K2, and the mass M2 and stiffness K2 satisfy the following relationship: K2X=4π2f 激 2 mr,M2=K2 / f 激 2, where X is the peak value of the vibration displacement of the dynamic vibration absorption component, r is the radius of the fan, m is the unbalanced mass of the fan component, and f 激 is the exciting force frequency.

[0009] In a possible embodiment, the exciting force frequency is equivalent to one sixtieth of the rotation speed of the fan assembly in the corresponding working state; and / or the peak value X of the vibration displacement of the dynamic vibration absorbing assembly is in the range of 0.03 mm to 0.1 mm.

[0010] In a possible embodiment, the range hood includes a plurality of dynamic vibration absorbing components, and the natural frequency of each dynamic vibration absorbing component is different from each other.

[0011] In a possible embodiment, the ratio μ of the mass of the dynamic vibration absorbing component to the mass of the smoke collecting hood is in the range of 0.1 to 0.3.

[0012] In a possible embodiment, the dynamic vibration absorbing assembly is further configured with a fixing bracket, and the elastic element is connected to the smoke collecting hood via the fixing bracket.

[0013] In a possible embodiment, the fixing bracket is fixed to the smoke collecting hood by bolts or welding.

[0014] In a possible embodiment, the smoke hood is constructed with a first side wall and a second side wall, the dynamic vibration absorption component is at least arranged on the first side wall and the second side wall of the smoke hood, and one end of the elastic unit is connected to the first side wall and the second side wall of the smoke hood.

[0015] In a possible embodiment, the smoke hood is constructed with a top plate and a bottom plate, the dynamic vibration absorbing assembly is at least arranged on the top plate or the bottom plate of the smoke hood, and one end of the elastic unit is connected to the top plate or the bottom plate of the smoke hood.

[0016] In a possible embodiment, the elastic unit includes at least one of the following: a spring, a rubber element, a damping element; and / or the mass unit is made of metal or cement.

[0017] Compared with the existing technology, by arranging a dynamic vibration absorption component on the smoke hood, the vibration caused by the unbalanced mass of the fan assembly can be reduced, the shaking phenomenon of the range hood smoke hood can be significantly improved, and the shaking of the range hood control panel can be avoided, the display effect of the control panel can be improved, and the user experience can be enhanced.

[0018] Secondly, in order to reduce the vibration of the range hood caused by the unbalanced mass, it is usually necessary to define a relatively strict allowable value of the unbalanced mass of the fan assembly. The above embodiment can allow a relatively large unbalanced mass, so that the strict dynamic balancing process is not required during the product production process, reducing complexity.

[0019] Furthermore, the above embodiment can reduce the requirement for the rigidity of the range hood cavity, and there is no need to design a range hood cavity with large rigidity to suppress the vibration of the whole machine. Therefore, the range hood cavity can be designed to be light, reducing the weight and cost of the range hood.

[0020] In addition, in the above embodiment, after the range hood has been running for a long time, as the oil pollution on the impeller increases, it means that the unbalanced mass increases, and the dynamic vibration absorption component can balance the change of the exciting force caused by the change of the unbalanced mass, and there will be no vibration intensification and shaking of the whole machine, thereby reducing the frequency of disassembly and cleaning of the impeller and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the range hood in the embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the arrangement of the dynamic vibration absorbing component in the embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of another arrangement of a dynamic vibration absorbing component in an embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of another arrangement of a dynamic vibration absorbing component in an embodiment of the utility model;

[0025] Figure 5 It is a schematic diagram of the power vibration absorption principle of the range hood in the embodiment of the utility model. DETAILED DESCRIPTION

[0026] refer to Figure 1 The range hood 10 is mainly composed of an external cavity 20 and a fan assembly 30 disposed in the external cavity 20. The external cavity 20 includes a housing 21 and a fume collecting hood 22 disposed below the housing 21. The fan assembly 30 mainly includes a volute, an impeller, a motor, a bracket and other components. The fan assembly 30 is rigidly connected to the housing 21 by screws or the like.

[0027] The smoke hood 22 is also provided with a control panel 40, which is used as an input and output interface to control the range hood and display content. Specifically, the smoke hood 22 is constructed with a peripheral wall, a top plate and a bottom plate, and the bottom plate is constructed with an air inlet, and these components together form a chamber through which air flows. Among them, the control panel 40 is usually arranged on the front wall of the peripheral wall.

[0028] In conjunction with the background technology, the range hood will generate low-frequency vibration when it is running. The unbalanced mass of the fan assembly is the main reason for the vibration of the fan assembly and the shaking of the range hood control panel. When the fan assembly has unbalanced mass, centrifugal force will be generated when the fan rotates. When the frequency of the centrifugal force coincides with the natural frequency of the range hood, resonance will occur. The resonance leads to a larger vibration amplitude, thereby causing the range hood control panel to shake.

[0029] In order to solve this problem, an embodiment of the utility model provides a range hood 10 capable of reducing vibrations, by arranging a dynamic vibration absorbing component on the range hood to balance the vibration exciting force, so as to significantly reduce the shaking of the range hood.

[0030] The basic concept of this dynamic vibration absorption scheme is to add a dynamic vibration absorption component to the range hood vibration system, such as Figure 5 As shown, M1 and K1 represent the mass and stiffness of the range hood vibration system, M2 and K2 represent the mass and stiffness of the power vibration absorbing component, and x1 and x2 represent the amplitudes of the range hood vibration system and the power vibration absorbing component, respectively. When the natural frequency of the power vibration absorbing component is equal to or close to the excitation frequency of the range hood vibration system, the force of the power vibration absorbing component on the vibration system can balance the excitation force on the vibration system. Through the dynamic action of the mass of the power vibration absorbing component, the power vibration absorbing component generates a reaction force on the vibration system that offsets the excitation force, and the amplitude x1 of the vibration of the vibration system will become smaller or even 0, thereby reducing the vibration of the range hood vibration system.

[0031] In order to reduce the shaking of the range hood control panel caused by the unbalanced mass of the fan, the vibration system here mainly refers to the smoke hood, and the dynamic vibration absorption component can be arranged on the smoke hood.

[0032] Specifically, refer to Figure 2-4 The range hood 10 further includes a power vibration absorbing assembly 50, which is disposed on the smoke collecting hood 22 and is used to balance the exciting force of the fan assembly 30 causing the smoke collecting hood 22 to vibrate when in operation, so as to reduce the vibration of the smoke collecting hood 22. The power vibration absorbing assembly 50 includes a mass unit 51 and an elastic unit 52, and two ends of the elastic unit 52 are respectively connected to the mass unit 51 and the smoke collecting hood 22.

[0033] When the fan assembly 30 is in operation, if the frequency of the centrifugal force generated by the unbalanced mass of the fan assembly is equal to the natural frequency of the smoke hood, the smoke hood will resonate and generate a large vibration. The dynamic vibration absorption assembly 50 generates a reaction force on the smoke hood to offset the centrifugal force (excitation force), so as to effectively reduce the vibration of the smoke hood.

[0034] Furthermore, the centrifugal force generated by the unbalanced mass of the fan assembly is a single-frequency exciting force, and the frequency of the centrifugal force is relatively low, and the damping of the range hood vibration system is relatively small, so the dynamic vibration absorption assembly is very effective in reducing the low-frequency vibration of the range hood, and in theory, the amplitude of the fume hood vibration can be reduced to 0. Thus, the impact of the fume hood vibration on the control panel is reduced.

[0035] In this embodiment, the vibration reduction effect of the dynamic vibration absorbing assembly 50 depends on its natural frequency. The dynamic vibration absorbing assembly 50 can be constructed so that its natural frequency is equal to or close to the frequency of the exciting force, where the exciting force comes from the centrifugal force generated by the unbalanced mass of the fan assembly 30. In this way, the amplitude of the smoke hood 22 will be close to or become 0.

[0036] Furthermore, the natural frequency of the dynamic vibration absorbing assembly 50 is determined by the mass M2 and stiffness K2 of the assembly itself. In this embodiment, the mass M2 and stiffness K2 of the dynamic vibration absorbing assembly 50 satisfy the following relationship:

[0037] K2X=4π2f 激 2 mr,M2=K2 / f 激 2 , where X is the peak value of the vibration displacement of the dynamic vibration absorption component, r is the radius of the fan, m is the unbalanced mass of the fan component, and f 激 is the exciting force frequency.

[0038] Through the above design, a dynamic vibration absorbing component that satisfies the above mass and stiffness relationship is constructed, which can reduce the vibration caused by the unbalanced mass of the fan component and significantly improve the shaking phenomenon of the range hood.

[0039] Furthermore, after the range hood has been running for a long time, as the oil pollution on the impeller increases, it means that the unbalanced mass increases, and the dynamic vibration absorption component can balance the changes in the exciting force caused by the changes in the unbalanced mass, and there will be no vibration intensification and shaking of the whole machine, thereby reducing the frequency of impeller disassembly and cleaning, and improving user experience.

[0040] In one embodiment, the excitation force frequency f 激 It can be determined by the speed of the fan. In the case where the unbalanced mass of the fan assembly causes vibration, the exciting force comes from the centrifugal force generated by the unbalanced mass of the fan assembly. The centrifugal force is related to the speed of the fan assembly. Therefore, the exciting force frequency f 激 It is set to be equivalent to one sixtieth of the rotation speed of the fan assembly 30 in the corresponding working state.

[0041] In one embodiment, the peak value X of the vibration displacement of the dynamic vibration absorbing assembly 50 is in the range of 0.03 mm to 0.1 mm. The peak value of the vibration displacement is related to the rotation speed of the fan assembly, and the peak value of the vibration displacement should be within a reasonable range, which can effectively reduce the vibration of the smoke hood on the one hand, and avoid excessive displacement causing the mass unit to collide with the smoke hood and affect the vibration reduction effect on the other hand.

[0042] The range hood 10 generally includes a plurality of working gears, and different gears correspond to different rotation speeds of the fan assembly 30. One or more resonances may occur in each working gear, and it is necessary to ensure that the natural frequency of the additional dynamic vibration absorbing assembly corresponds to the frequency of the exciting force, so as to effectively reduce the vibration of the range hood.

[0043] Therefore, in one embodiment, when the smoke collecting hood 22 of the range hood 10 has multiple excitation frequencies, multiple power vibration absorbing components 50 can be added, the natural frequencies of each power vibration absorbing component 50 are different from each other, and the multiple power vibration absorbing components 50 can respectively reduce vibrations of multiple frequencies. It is only necessary to ensure that the natural frequencies of the added power vibration absorbing components 50 correspond one to one with the natural frequencies of the range hood 22.

[0044] For example, the range hood includes three gears A, B, and C, and the corresponding speed ranges are 1000 to 1500, 1500 to 2000, and 2000 to 2500. Correspondingly, if there is an exciting force in each gear that causes the fume hood to resonate due to the unbalanced mass of the fan assembly, then three dynamic vibration absorbing assemblies with different natural frequencies can be set on the range hood to balance the exciting force of the fan assembly causing the fume hood to vibrate in each gear, so as to reduce the fume hood vibration.

[0045] In another embodiment, the structure of the power vibration absorbing assembly 50 can also be determined based on the mass relationship between the range hood vibration system and the power vibration absorbing assembly. Preferably, the ratio μ of the mass of the power vibration absorbing assembly 50 to the mass of the fume hood 22 is in the range of 0.1 to 0.3, so as to ensure that the power vibration absorbing assembly 50 has a good vibration absorbing effect within a certain frequency range. In addition, the feasibility of the structure and the layout space of the fume hood also need to be considered.

[0046] In some common embodiments, the dynamic vibration absorbing assembly 50 is further configured with a fixing bracket, and the elastic element 52 is connected to the smoke collecting hood 22 via the fixing bracket. For example, the fixing bracket can be fixed to the smoke collecting hood 22 by bolts or welding or other reliable methods.

[0047] In some common embodiments, the dynamic vibration absorbing assembly 50 is connected to the shell of the smoke hood 22 through the elastic unit 52 and is located inside the shell. For example, the smoke hood 22 is constructed with a peripheral wall 220, a top plate 221 and a bottom plate 222. Figure 2, the power vibration absorbing component 50 can be set on the bottom plate 222. In other cases, the power vibration absorbing component 50 can be set on the top plate 221, or on both the top plate 221 and the bottom plate 222. In this way, the vibration of the smoke hood in the up and down directions can be reduced. As for the setting position of the power vibration absorbing component on the top plate or the bottom plate, it can be adjusted according to the vibration conditions of the specific vibration position of the smoke hood, and is generally set in an area where the vibration is relatively severe. Figure 2 and 3 As shown, the dynamic vibration absorbing component can be arranged on the left side, right side or middle position of the base plate.

[0048] For example, combining Figure 4 The peripheral wall 220 of the smoke hood 22 includes a first side wall 2201 and a second side wall 2202. The dynamic vibration absorbing component 50 can be arranged on the first side wall 2201 or the second side wall 2202, or on both side walls at the same time. In this way, the vibration of the smoke hood in the left and right directions can be reduced. Similarly, as for the setting position of the dynamic vibration absorbing component, it can be adjusted according to the vibration conditions of the specific vibration position of the smoke hood, and is generally set in an area where the vibration is relatively severe.

[0049] In some common embodiments, the elastic unit 52 may be at least one of a spring, a rubber element, and a damping element. Figure 2-4 The elastic element 52 of the medium dynamic vibration absorbing assembly 50 may include both a spring and a damping element.

[0050] In some common embodiments, the mass unit 51 is made of metal or cement. Usually, a material with a relatively high density is selected to minimize the volume of the mass unit and avoid affecting the original volume of the smoke hood.

[0051] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, the technical features of one or more dependent claims may be combined with the technical features of the independent claim, based on actual needs and where technically feasible, and may be derived from the technical features of the corresponding independent claim in any appropriate manner rather than simply through the specific combination listed in the claims.

[0053] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A range hood, comprising: chassis, a fan assembly disposed in the housing, and A smoke collecting hood disposed below the housing; characterized in that it also includes: The dynamic vibration absorption component is arranged on the smoke hood and is used to balance the exciting force of the smoke hood caused by the fan component in the working state to reduce the vibration of the smoke hood, wherein the dynamic vibration absorption component includes a mass unit and an elastic unit, and the two ends of the elastic unit are respectively connected to the mass unit and the smoke hood.

2. The range hood according to claim 1, characterized in that: The dynamic vibration absorbing component is constructed such that its natural frequency is equal to or close to the exciting force frequency, wherein the natural frequency of the dynamic vibration absorbing component is related to its mass M2 and stiffness K2, and the mass M2 and stiffness K2 satisfy the following relationship: K2X=4π2f 激 2 mr,M2=K2 / f 激 2 , where X is the peak value of the vibration displacement of the dynamic vibration absorption component, r is the radius of the fan, m is the unbalanced mass of the fan component, and f 激 is the exciting force frequency.

3. The range hood according to claim 2, characterized in that: The exciting force frequency is equivalent to one sixtieth of the rotation speed of the fan assembly in the corresponding working state; and / or the peak value X of the vibration displacement of the dynamic vibration absorbing assembly ranges from 0.03 mm to 0.1 mm.

4. The range hood according to claim 2, characterized in that: The range hood comprises a plurality of dynamic vibration absorbing components, and the natural frequencies of each dynamic vibration absorbing component are different from each other.

5. The range hood according to claim 1, characterized in that: The value range of the ratio μ of the mass of the dynamic vibration absorbing component to the mass of the smoke collecting hood is 0.1 to 0.

3.

6. The range hood according to any one of claims 1 to 5, characterized in that: The dynamic vibration absorbing assembly is also configured with a fixing bracket, and the elastic unit is connected to the smoke collecting hood via the fixing bracket.

7. The range hood according to claim 6, characterized in that: The fixing bracket is fixed to the smoke collecting hood by bolts or welding.

8. The range hood according to any one of claims 1 to 5, characterized in that: The smoke collecting hood is constructed with a first side wall and a second side wall, the dynamic vibration absorbing component is at least arranged on the first side wall and the second side wall of the smoke collecting hood, and one end of the elastic unit is connected to the first side wall and the second side wall of the smoke collecting hood.

9. The range hood according to any one of claims 1 to 5, characterized in that: The smoke collecting hood is structured with a top plate and a bottom plate, the dynamic vibration absorbing component is at least arranged on the top plate or the bottom plate of the smoke collecting hood, and one end of the elastic unit is connected to the top plate or the bottom plate of the smoke collecting hood.

10. The range hood according to any one of claims 1 to 5, characterized in that: The elastic unit includes at least one of the following: a spring, a rubber element, a damping element; and / or the mass unit is made of metal or cement.

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