An engine protection plate with phononic crystals

Abstract

The present invention provides an engine protection plate with phononic crystals, which includes: a connecting bracket and a main board, wherein the connecting bracket is fixedly connected to the main board, and the main board is provided with phononic crystals for vibration isolation and noise reduction, and the main board is made by periodically alternating and superimposing metal layers and non-metallic layers, thereby forming a first group of phononic crystals; a non-metallic cylinder array is also provided in the main board, and forms a second group of phononic crystals with the main board, and the material of the non-metallic cylinders is different from that of the main board. The non-metallic layer can be a piezoelectric material or a thermoelectric material. In this way, energy is recycled and converted to save energy. The present invention effectively solves the technical problems that the existing engine protection plates have no energy recovery function and poor noise reduction effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine protection plates, and in particular relates to an engine protection plate with phononic crystals. Background Art

[0002] The engine guard is a crucial component for protecting the vehicle's engine oil pan. It prevents flying stones from striking the oil pan while the vehicle is in motion and also provides a certain degree of insulation from engine noise. Traditional engine guards, which simply utilize metal or non-metallic partitions, offer limited functionality, failing to achieve optimal noise and vibration reduction, and failing to convert the engine's vibrational mechanical energy and thermal radiation into usable energy. Summary of the Invention

[0003] In view of the above-mentioned drawbacks, the present invention provides an engine protection plate with phononic crystals, which effectively solves the technical problems of the existing engine protection plates having no energy recovery function and poor noise reduction effect.

[0004] The present invention is achieved through the following technical solutions:

[0005] An engine protection plate with phononic crystals comprises a connecting bracket and a main board, wherein the connecting bracket is fixedly connected to the main board, and the main board is provided with phononic crystals for vibration isolation and noise reduction.

[0006] Furthermore, the mainboard is made by periodically and alternately stacking metal layers and non-metal layers, thereby forming a first group of phononic crystals.

[0007] Preferably, the non-metallic layer is a piezoelectric material or a thermoelectric material.

[0008] Preferably, the metal layer is an alloy.

[0009] Preferably, the metal layer is steel or copper.

[0010] Furthermore, a non-metallic cylinder array is provided in the mainboard, and forms a second group of phononic crystals with the mainboard, and the material of the non-metallic cylinder is different from that of the mainboard.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects:

[0012] The present invention improves the vibration isolation and noise reduction effect of the engine protective plate by improving the traditional engine protective plate to a structure in which phononic crystals are arranged on it; the main board of the engine protective plate is designed to be a periodically alternating superposition of metal layers and non-metal layers, so that the main board body of the engine protective plate forms a first group of phononic crystals; the effect of adjusting the cutoff frequency can be achieved by adjusting the thickness of the metal layer and the non-metallic layer and the combination of different materials; a non-metallic cylindrical array is arranged in the main board of the protective plate to form a second group of phononic crystals with the metal main board, so that the noise can be cut off and blocked in another frequency band, thereby further achieving a better noise reduction effect; by setting the non-metallic layer of the main board as a piezoelectric material, the mechanical energy brought by the vibration of the engine can be converted into electrical energy while realizing the phononic crystal structure, and the electrical energy can be recovered through the electrical energy recovery device, thereby further improving the energy utilization rate; by setting the non-metallic layer as a thermoelectric material, the heat energy radiated by the engine can be converted into electrical energy, and then the electrical energy can be recovered through the electrical energy recovery device, thereby further improving the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 Schematic diagram of the three-dimensional structure of the protective plate of the present invention;

[0015] Figure 2 This is a schematic diagram of the main structure of the protective plate of the present invention;

[0016] Figure 3 for Figure 2 A partial enlarged view of the middle part;

[0017] Figure 4 This is a diagram of the array arrangement of the second group of phononic crystals on the mainboard of the present invention;

[0018] Figure 5 This is a schematic diagram of the non-metallic cylindrical structure of the present invention.

[0019] Description of reference numerals:

[0020] 1- Mainboard, 101- Metal layer, 102- Non-metal layer, 2- Connecting bracket, 3- Non-metal cylinder. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0026] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] The noise reduction principle of the protective plate of the present invention is that when elastic waves propagate through a phononic crystal, their internal structure blocks them within a certain frequency range (the bandgap), while allowing them to propagate losslessly within other frequency ranges (the passband). This achieves the desired noise reduction effect. Therefore, the bandgap frequency range should be tailored to the noise frequency range. Adjusting the bandgap frequency range requires adjusting the material and thickness of the phononic crystal based on the actual measured noise frequency range.

[0028] The following is a detailed description through specific implementation methods and examples.

[0029] Figure 1 Schematic diagram of the three-dimensional structure of the protective plate of the present invention; Figure 2 This is a schematic diagram of the main structure of the protective plate of the present invention; Figure 3 for Figure 2 A local enlarged picture; Figure 1-3 As shown, the engine shield comprises a connecting bracket 2 and a main plate 1. Four connecting brackets 2 are bolted to either side of the main plate 1. The main plate 1 is constructed by periodically alternating metal layers 101 and non-metallic layers 102, forming a first set of phononic crystals. In one embodiment, the metal layers 101 are preferably made of steel, copper, or other alloys; the non-metallic layers 10 are preferably made of nylon, a polymer composite, or rubber. The arrangement of the metal layers 101, non-metallic layers 102, metal layers 101, non-metallic layers 102, and metal layers 101 creates a set of phononic crystals with a specific cutoff frequency band.

[0030] By designing the main board of the engine guard plate as a periodic alternating superposition of metal layers and non-metal layers, the main board body of the engine guard plate can form a first group of phononic crystals, and the effect of adjusting the cutoff frequency can be achieved by adjusting the thickness of the metal layer and the non-metal layer and the combination of different materials.

[0031] In the above embodiment, the non-metallic layer 102 can also be set as a piezoelectric material or a thermoelectric material. When set as a piezoelectric material, the vibration caused by the engine can cause the protective plate to have a certain deformation, thereby generating a voltage inside the piezoelectric material. At this time, the purpose of collecting electricity can be achieved through an energy recovery device or a charging drive circuit connected to a lead-acid battery. In this case, polyvinylidene fluoride (PVDF) can be used as the piezoelectric material. When set as a thermoelectric material, the heat radiation from the engine will cause the surrounding temperature to rise sharply. At this time, the thermoelectric material will convert the heat energy into electricity. At this time, the purpose of collecting electricity can also be achieved through an energy recovery device or a charging drive circuit connected to a lead-acid battery.

[0032] By setting the non-metallic layer of the mainboard to piezoelectric material, the mechanical energy brought by the vibration of the engine can be converted into electrical energy while realizing the phononic crystal structure, and the electrical energy can be recovered through the electrical energy recovery device, further improving the energy utilization rate; by setting the non-metallic layer to thermoelectric material, the heat energy radiated by the engine can be converted into electrical energy, and then the electrical energy can be recovered through the electrical energy recovery device, further improving the energy utilization rate.

[0033] Figure 4 This is a diagram of the array arrangement of the second group of phononic crystals on the mainboard of the present invention; Figure 5 This is a schematic diagram of the non-metallic cylindrical structure of the present invention.

[0034] As a further example, Figure 4-5 As shown, the mainboard 1 also contains a second set of phononic crystals. This second set of phononic crystals consists of an array of equally spaced non-metallic cylinders 3 and a mainboard. In implementation, the mainboard 1 is pre-established with an array of through-holes. The non-metallic cylinders 3 are then filled into the through-holes with insulating adhesive. Of course, the material of the non-metallic cylinders 3 must be different from that of the mainboard. This ensures that the noise intercepted by the first and second sets of phononic crystals differs. The non-metallic cylinders 3 are preferably made of rubber.

[0035] Of course, if the noise cutoff frequency needs to be adjusted, the material, elastic modulus, and thickness of the phononic crystals can be adjusted accordingly. Adjusting the cutoff frequency for the second set of phononic crystals can be accomplished by adjusting the distance between the non-metallic cylinders 3, their elastic modulus, and their thickness to achieve the desired cutoff frequency.

[0036] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An engine protection plate with phononic crystals, characterized in that: The engine protection plate includes: a connecting bracket and a main board, the connecting bracket is fixedly connected to the main board, and the main board is provided with a phononic crystal for vibration isolation and noise reduction; The mainboard is made by periodically and alternately stacking metal layers and non-metal layers, thereby forming a first group of phononic crystals; The non-metallic layer is a thermoelectric material; A non-metallic cylinder array is also provided in the mainboard, and forms a second group of phononic crystals with the mainboard. The material of the non-metallic cylinder is different from that of the mainboard.

2. The engine protection plate according to claim 1, characterized in that: The metal layer is an alloy.

3. The engine protection plate according to claim 1, characterized in that: The metal layer is steel or copper.

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