Phononic crystal unit cell structure, shell structure, liquid accumulator and compressor

Abstract

The invention provides a phononic crystal unit cell structure, a shell structure, a liquid accumulator and a compressor, the phononic crystal unit cell structure comprises a matrix and a phononic crystal, the phononic crystal is provided with an elastic body and a scatterer arranged on the elastic body; the substrate is provided with an acoustic black hole area, the phononic crystal is arranged at the acoustic black hole area, and the phononic crystal is in contact with the acoustic black hole area through the elastic body. According to the technical scheme, the acoustic black hole area on the base body has the effect of collecting vibration on the base body, and the photonic crystal is arranged at the acoustic black hole area and makes contact with the acoustic black hole area through the elastic body, so that efficient vibration reduction can be achieved through the photonic crystal; therefore, the overall vibration and noise reduction effect of the photonic crystal unit cell structure can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration reduction and noise reduction of shells, and specifically relates to a phononic crystal unit cell structure, a shell structure, a liquid reservoir and a compressor. Background Art

[0002] The four main components of the refrigeration cycle system are the compressor, condenser, evaporator and expansion valve. Among them, the compressor mainly includes four parts: compression mechanism, shell, drive motor and liquid reservoir. At present, the miniaturization and high speed of compressors have become the development trend of the industry. However, in the process of high speed, with the increase of speed, the vibration and noise problems generated by the compressor body are more prominent, which seriously affects the user experience. The main excitation force of the rotary compressor is affected by the motor torque and gas resistance torque. A liquid reservoir is provided on one side of the rotary compressor. During the operation of the compressor, the vibration generated by the compressor will be transmitted to the liquid reservoir, causing the liquid reservoir to vibrate and generate noise. In addition, since the suction process of the compressor during operation is intermittent and periodic, the liquid reservoir will produce suction noise, eddy noise and cavity resonance noise.

[0003] The existing related technology discloses a phononic crystal unit cell structure, which is designed with phononic crystals and acoustic black hole structures on a substrate, wherein the phononic crystals and the acoustic black hole structures are arranged on the substrate at intervals, and the phononic crystals and the acoustic black hole structures cooperate to achieve the effect of reducing vibration and noise of the substrate.

[0004] Among them, the phononic crystal and the acoustic black hole structure on the above-mentioned substrate are arranged at intervals, and the two play the role of vibration reduction and noise reduction respectively, without coordinated cooperation, resulting in limited vibration reduction and noise reduction effect of the phononic crystal unit cell structure, which needs to be further improved. Summary of the invention

[0005] Therefore, the present invention provides a phononic crystal unit cell structure, a shell structure, a liquid reservoir and a compressor, which can solve the technical problem that the vibration reduction and noise reduction effect of the phononic crystal unit cell structure in the prior art is limited and needs to be further improved.

[0006] In order to solve the above problems, the present invention provides a phononic crystal unit cell structure, which includes a substrate and a phononic crystal, wherein the phononic crystal has an elastic body and a scatterer arranged on the elastic body;

[0007] The substrate has an acoustic black hole region, the phononic crystal is arranged in the acoustic black hole region, and the phononic crystal is in contact with the acoustic black hole region through the elastomer.

[0008] In some embodiments, the thickness of the acoustic black hole region gradually decreases from the outside to the inside, and the phononic crystal is arranged at the point where the thickness of the acoustic black hole region is the smallest through the elastomer.

[0009] In some embodiments, a via hole is provided in the middle of the acoustic black hole region, and the thickness of the acoustic black hole region at the via hole is minimized; wherein the phononic crystal is embedded in the via hole through the elastomer.

[0010] In some embodiments, the inner peripheral wall of the via hole and the elastic body are plug-fitted together.

[0011] In some embodiments, the elastic body is provided with an annular groove extending in the circumferential direction, and the inner circumferential wall of the through hole is inserted into the annular groove in the circumferential direction.

[0012] In some embodiments, the elastic body and the through hole are interference fit.

[0013] In some embodiments, the thickness of the acoustic black hole region (12) decreases gradually from the outside to the inside according to a power exponential.

[0014] In some embodiments, the substrate has a first surface and a second surface relative to each other, the first surface is provided with a groove, the second surface has a first area surface opposite to the groove, and the wall thickness of the substrate between the first area surface and the groove forms the acoustic black hole region.

[0015] In some embodiments, the elastomer has an inner hole running through both ends; the scatterer is columnar, and the scatterer is embedded in the inner hole.

[0016] In some embodiments, when the thickness of the acoustic black hole region on the substrate gradually decreases from the outside to the inside, the substrate is plate-shaped, and the maximum thickness of the substrate is 0.5mm≤t≦5.0mm; the elastomer is ring-shaped, and the outer radius of the elastomer is 10.0mm≤r1≦30.0mm, the inner radius of the elastomer is 5.0mm≤r2≦25.0mm, and the height of the elastomer is 5.0mm≤h1≦25.0mm; the scatterer is cylindrical, and the radius of the scatterer is r3=r2, and the height of the scatterer is 5.0mm≤h2≦25.0mm.

[0017] The present invention also provides a shell structure, which comprises a shell and the phononic crystal unit cell structure described in any one of the above;

[0018] Wherein, the shell wall of the shell constitutes the matrix of the phononic crystal unit cell structure.

[0019] The present invention also provides a liquid storage device or a compressor, which comprises the shell structure described above.

[0020] The phononic crystal unit cell structure, shell structure, liquid reservoir and compressor provided by the present invention have the following beneficial effects:

[0021] 1. Compared with the prior art design that the acoustic black hole structure and the phononic crystal on the substrate are designed to reduce vibration and noise separately, the technical solution of the present invention realizes the effective combination of the acoustic black hole structure and the phononic crystal, so that the acoustic black hole structure and the phononic crystal can work together. Specifically, the acoustic black hole region on the substrate has the function of collecting the vibration on the substrate, and the phononic crystal is arranged in the acoustic black hole region, and the phononic crystal is in contact with the acoustic black hole region through an elastic body, so that the phononic crystal can be used to achieve efficient vibration reduction, thereby improving the overall vibration reduction and noise reduction effect of the phononic crystal unit cell structure of the present invention.

[0022] 2. The present invention designs the size of the phononic crystal unit cell structure so that it can achieve efficient noise reduction in the 0-870Hz frequency band, and its sound insulation performance in multiple frequency bands breaks through the "quality law" of traditional sound insulation materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 It is a schematic structural diagram of a phononic crystal unit cell structure provided by one embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A cross-sectional view of the unit cell structure of a mesophonic crystal;

[0026] Figure 3 yes Figure 2 Schematic diagram of the size of the unit cell structure of the mesophonic crystal;

[0027] Figure 4 It is a structural schematic diagram of a base of a phononic crystal unit cell structure provided by one embodiment of the present invention;

[0028] Figure 5 is a structural schematic diagram of a liquid storage device provided by an embodiment of the present invention;

[0029] Figure 6 It is a comparison curve of the sound transmission loss of the phononic crystal unit cell structure of the present invention and a 2 mm cold-rolled steel plate.

[0030] The accompanying drawings are marked as follows:

[0031] 1. Intake pipe; 2. Upper cover; 3. Filter assembly; 4. Shell; 5. Phononic crystal; 6. Straight pipe; 7. Lower cover; 8. Intake pipe; 51. Elastomer; 52. Scatterer; 11. Matrix; 12. Acoustic black hole region; 110. Via hole; 111. First surface; 112. Second surface; 121. Groove; 901. Annular groove; 1121. First region surface. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] See also Figure 1-4 As shown, according to an embodiment of the present invention, a phononic crystal unit cell structure is provided, which includes a substrate 11 and a phononic crystal 5. The phononic crystal 5 has an elastic body 51 and a scatterer 52 arranged on the elastic body 51. The substrate 11 has an acoustic black hole region 12, and the phononic crystal 5 is arranged at the acoustic black hole region 12, and the phononic crystal 5 is in contact with the acoustic black hole region 12 through the elastic body 51.

[0037] Compared with the prior art design that the acoustic black hole structure and the phononic crystal on the substrate each reduce vibration and noise separately, the technical solution of the present invention realizes the effective combination of the acoustic black hole structure (i.e. the acoustic black hole region 12 mentioned above) and the phononic crystal 5, so that the acoustic black hole structure and the phononic crystal 5 can work together. Specifically, the acoustic black hole region 12 on the substrate 11 has the function of collecting the vibration on the substrate 11, and the phononic crystal 5 is arranged at the acoustic black hole region 12, and the phononic crystal 5 is in contact with the acoustic black hole region 12 through the elastic body 51, so that the phononic crystal 5 can be used to achieve efficient vibration reduction, thereby improving the overall vibration reduction and noise reduction effect of the phononic crystal unit cell structure of the present invention.

[0038] In some embodiments, Figure 2 As shown, the thickness of the acoustic black hole region 12 gradually decreases from the outside to the inside. The phononic crystal 5 is arranged at the minimum thickness of the acoustic black hole region 12 through the elastic body 51 .

[0039] In the above example, since the thickness of the acoustic black hole region 12 gradually decreases from the outside to the inside, the acoustic black hole region 12 can gather the vibration to the point where the thickness is minimum. When the point where the thickness of the acoustic black hole region 12 is minimum is located at its center, the acoustic black hole region 12 can "localize" the vibration at the center of the acoustic black hole region 12, thereby allowing the phononic crystal 5 located at the point where the thickness is minimum to efficiently reduce vibration, thereby further improving the effect of vibration reduction and noise reduction.

[0040] In order to achieve the purpose of setting the phononic crystal 5 at the minimum thickness of the acoustic black hole region 12 through the elastic body 51, in some embodiments, a via hole 110 is provided in the middle of the acoustic black hole region 12, and the via hole 110 is a through hole. The thickness of the acoustic black hole region 12 is minimized at the via hole 110. The phononic crystal 5 is embedded in the via hole 110 through the elastic body 51.

[0041] In the above example, the acoustic black hole region 12 can collect vibrations to the via 110, and then the phononic crystal 5 receives the vibrations collected by the acoustic black hole region 12 along the circumferential direction through the elastomer 51, thereby improving the vibration reduction efficiency of the phononic crystal 5 and enhancing the overall vibration reduction and noise reduction effect of the phononic crystal unit cell structure of the present invention.

[0042] In some embodiments, Figure 2 As shown, the inner wall of the aforementioned via 110 and the elastomer 51 are plugged together, which can improve the stability of the connection between the elastomer 51 and the acoustic black hole region 12, thereby facilitating the phononic crystal 5 to efficiently reduce the vibration collected in the acoustic black hole region 12.

[0043] In order to achieve the effect of plugging and matching between the inner peripheral wall of the via hole 110 and the elastic body 51, in some embodiments, as Figure 2 As shown, the elastic body 51 is provided with an annular groove 901 extending in the circumferential direction, and the inner circumferential wall of the through hole 110 is inserted into the annular groove 901 in the circumferential direction.

[0044] In some embodiments, the aforementioned elastomer 51 and the via 110 are interference fit, which can further improve the connection stability between the elastomer 51 and the via 110, thereby facilitating the phononic crystal 5 to efficiently reduce the vibration collected by the acoustic black hole region 12.

[0045] In some embodiments, the elastic body 51 may be a silicone rubber ring. Figure 2 As shown, the aforementioned annular groove 901 is located in the middle of the outer surface of the elastomer 51, and the groove width between the two opposite groove walls of the annular groove 901 is equal to the thickness of the outer edge of the through hole 110 of the substrate 11, and the diameter of the elastomer 51 at the bottom of the annular groove 901 is slightly larger than the diameter of the through hole 110, so that after the scatterer 52 is embedded in the elastomer 51, the elastomer 51 and the through hole 110 can be interference fit, so that the elastomer 51 and the through hole 110 can be sealed, so that when the phononic crystal unit cell structure of the present invention is applied to the shell 4 of the liquid reservoir, the liquid reservoir can still maintain a sealed state. The scatterer 52 is embedded in the hollow part of the annular ring of the elastomer 51, and the scatterer 52 can be a steel cylinder, and the height of the scatterer 52 can be the same as the height of the elastomer 51.

[0046] In some embodiments, the thickness of the acoustic black hole region 12 decreases from the outside to the inside according to a power exponent. Specifically, the position of any point on the acoustic black hole region is x, and the thickness of the acoustic black hole region corresponding to point x is h(x), where h(x)=εx n ; n≥2, ε is a constant.

[0047] It should be noted here that an acoustic black hole (ABH) is the acoustic analogy of the concept of a black hole in astrophysics. It is a structure that has a convergence effect on bending waves through changes in geometric parameters or material properties. Under absolutely ideal conditions, the velocity of bending waves gradually decreases to zero in the acoustic black hole region 12.

[0048] In the above example, the substrate 11 is a two-dimensional acoustic black hole plate, in which, by changing the thickness of the acoustic black hole region 12 according to the power exponent h(x), the bending wave number can approach infinity, and the group velocity and phase velocity can approach 0, that is, no reflection will be formed, thereby achieving the "convergence" of vibrations.

[0049] In order to form the aforementioned acoustic black hole region 12, in some embodiments, as Figure 4 As shown, the aforementioned substrate 11 has a first surface 111 and a second surface 112 opposite to each other. A groove 121 is formed on the first surface 111, and the second surface 112 has a first area surface 1121 opposite to the groove 121. The wall thickness of the substrate 11 between the first area surface 1121 and the groove 121 forms the aforementioned acoustic black hole area 12 (i.e. Figure 4 The portion of the substrate 11 within the dotted frame).

[0050] In some embodiments, the second surface 112 may be a plane, which facilitates processing.

[0051] In some embodiments, the elastic body 51 has an inner hole running through both ends. The scatterer 52 is columnar, and the scatterer 52 is nested in the inner hole. The elastic body 51 can be annular, and the scatterer 52 can be cylindrical. When the elastic body 51 is annular, the via 110 on the substrate 11 is a circular hole adapted to the elastic body 51.

[0052] In the above example, the elastic body 51 and the scatterer 52 can cooperate to form the aforementioned phononic crystal 5 to reduce vibration and noise. The scatterer 52 and the elastic body 51 together constitute a "mass-spring" system, which has a resonant frequency. Under the excitation of elastic waves of a specific frequency (i.e., the resonant frequency of the "mass-spring" system), the scatterer 52 resonates and interacts with the elastic wave traveling wave in the matrix 11, thereby suppressing the propagation of the elastic wave and achieving the effect of suppressing vibration.

[0053] It should be noted here that the elastic modulus of the materials of the above-mentioned elastomer 51 and the scatterer 52 should be greatly different. In some embodiments, the elastomer 51 of the above-mentioned phononic crystal can be made of a flexible material such as silicone rubber or rubber. The scatterer 52 of the above-mentioned phononic crystal can be made of a metal material such as steel, copper or iron. Among them, the scatterer 52 made of metal material increases the weight of the phononic crystal unit cell structure. When the phononic crystal 5 is set on the shell 4, it can increase the weight of the shell 4 and can also have a vibration reduction effect.

[0054] Among them, the size and material of the above-mentioned phononic crystal unit cell structure can be adjusted according to actual conditions, so that the frequencies of the peaks and troughs of the sound transmission loss curve of the phononic crystal unit cell structure change to adapt to different vibration reduction application scenarios. When the phononic crystal unit cell structure is applied to the shell structure, the weight of the shell structure can be increased by increasing the number of phononic crystal unit cells or increasing the weight of the scatterer 52, which can achieve a vibration reduction effect.

[0055] In some embodiments, Figure 3 As shown, when the thickness of the acoustic black hole region 12 on the substrate 11 gradually decreases from the outside to the inside, the substrate 11 can be plate-shaped, and the maximum thickness of the substrate 11 is 0.5mm≤t≦5.0mm. The elastic body 51 is annular, and the outer radius of the elastic body 51 is 10.0mm≤r1≦

[0056] 30.0mm, the inner radius of the elastic body 51 is 5.0mm≤r2≦25.0mm, and the height of the elastic body 51 is 5.0mm≤h1≦25.0mm. The scatterer 52 is cylindrical, and the radius of the scatterer 52 is r3=r2, and the height of the scatterer 52 is 5.0mm≤h2≦25.0mm.

[0057] In the above example, the phononic crystal unit cell structure of the present invention can achieve efficient noise reduction in the 0-870 Hz frequency band after adopting the above-mentioned size design, and its sound insulation performance in multiple frequency bands breaks through the "mass law" of traditional sound insulation materials.

[0058] In a specific application example, the maximum thickness t of the substrate 11 is 2 mm. The outer radius r1 of the elastic body 51 is 20 mm, the inner radius r2 of the elastic body 51 is 16 mm, the height h1 of the elastic body 51 is 6 mm, and the height h2 of the scatterer 52 is 6 mm.

[0059] It should be noted that the phononic crystal unit cell structure of the present invention is a local resonance type phononic crystal 5, and its band gap starting frequency f1 and ending frequency f2 are calculated according to the following formula:

[0060]

[0061] Where m1 is the mass of the scatterer, m2 is the equivalent mass of the matrix, and k is the equivalent stiffness of the elastic body.

[0062] The sound transmission loss (sound insulation) TL of the phononic crystal unit cell structure of the present invention can be calculated according to the following formula:

[0063]

[0064] In the formula, p in is the incident sound wave pressure amplitude, p out It is the pressure amplitude of the transmitted sound wave. The unit of TL is dB.

[0065] According to the above formula, when the elastomer 51 of the phononic crystal unit cell structure of the present invention is in a ring shape, and the scatterer 52 is in a cylindrical shape, and the material of the elastomer 51 is silicone rubber, and the material of the scatterer 52 is cold-rolled steel plate or steel, the geometric parameters of the phononic crystal unit cell structure of the present invention are shown in Table 1 below, and its material parameters are shown in Table 2 below.

[0066] Table 1 Geometric parameters of phononic crystal unit cell structure (unit: mm)

[0067] Lattice constant a 50 Maximum thickness of substrate t 2 Elastic outer circle radius <![CDATA[r1]]> 20 Elastic inner circle radius <![CDATA[r2]]> 16 Elastic body height <![CDATA[h1]]> 6 Scatter radius <![CDATA[r3]]> 16 Scatterer height <![CDATA[h2]]> 6

[0068] Table 2 Phononic crystal unit cell structure material parameters

[0069] Material <![CDATA[Density / kg·m -3 > Elastic modulus / Pa Poisson's ratio Cold rolled steel plate / steel 7850 <![CDATA[2.21×e 11 ]]> 0.3 Silicone Rubber 1300 <![CDATA[1.37×e 5 ]]> 0.47

[0070] Based on the geometric parameters and material parameters of the above-mentioned phononic crystal unit cell structure, its sound transmission loss is numerically calculated. The results are shown in Figure 6 As shown in the sound transmission loss curve. The above-mentioned phononic crystal unit cell structure can be applied to a shell 4 such as a reservoir shell or a compressor shell. Since the traditional reservoir shell or compressor shell is generally made of cold-rolled steel plate and has a wall thickness of 2.0 mm, compared with the traditional shell 4 that is not provided with the phononic crystal unit cell structure of the present invention, it can be clearly seen from the figure that the sound transmission loss of the phononic crystal unit cell structure of the present invention in most frequencies of 0-870 Hz is greater than that of the 2 mm cold-rolled steel plate, indicating that the phononic crystal unit cell structure of the present invention can achieve efficient noise reduction in the 0-870 Hz frequency band, and its sound insulation performance in multiple frequency bands breaks through the "mass law" of traditional sound insulation materials.

[0071] Among them, the phononic crystal unit cell structure of the present invention can effectively reduce the vibration response by using the phononic crystal 5 and the acoustic black hole structure. At the same time, when the phononic crystal unit cell structure of the above size is applied to a housing 4 such as a reservoir housing or a compressor housing, the phononic crystal unit cell structure is periodically arranged on the housing 4, which can effectively reduce the vibration and noise of the reservoir or compressor in a wide frequency band of 0-870Hz.

[0072] In some embodiments, Figure 5 As shown, the present invention further provides a shell structure, which includes a shell 4 and any one of the above-mentioned phononic crystal unit cell structures. The shell wall of the shell 4 constitutes the matrix 11 of the above-mentioned phononic crystal unit cell structure.

[0073] In the above example, since the shell structure adopts the above-mentioned phononic crystal unit cell structure, the acoustic black hole region 12 on the substrate 11 has the function of collecting the vibrations on the substrate 11, and the phononic crystal 5 is arranged in the acoustic black hole region 12, and the phononic crystal 5 is in contact with the acoustic black hole region 12 through the elastomer 51, it is possible to utilize the phononic crystal 5 to achieve efficient vibration reduction, thereby improving the overall vibration reduction and noise reduction effect of the phononic crystal unit cell structure of the present invention.

[0074] Among them, when the acoustic black hole region 12 of the substrate is provided with a through hole 110, and the elastomer 51 of the phononic crystal is interference fit with the through hole 110, the sealing between the phononic crystal 5 and the through hole 110 can be achieved, so that when the shell structure is applied to a liquid reservoir or a compressor, the sealing of the shell structure can be ensured, and the shell structure can be prevented from leaking at the through hole 110, so that the phononic crystal unit cell structure also has a sound insulation effect.

[0075] It should be noted here that the above-mentioned phononic crystal unit cell structure should be arranged periodically on the shell 4. Because the definition of phononic crystal is: a periodic structure composed of 2 or more materials. It is precisely because of the periodicity of the medium inside the phononic crystal 5 (band gap generation mechanism: that is, the periodicity of the material - Bragg scattering mechanism; the periodicity of the structure - local resonance mechanism) that an elastic wave band gap can be generated when the elastic wave propagates therein, so the band gap characteristics of the phononic crystal 5 can be used to achieve effective suppression of vibration and noise within the band gap frequency range. The phononic crystal 5 of the present invention is a local resonance type phononic crystal. The local resonance mechanism believes that under the excitation of elastic waves of a specific frequency, each scatterer 52 resonates and interacts with the elastic wavelength wave traveling wave, thereby suppressing its propagation. Combined with the local resonance band gap theory of the phononic crystal 5, it can be known that when the sound wave approaches a certain order natural frequency of the oscillator, the combined force of the external excitation force on the matrix 11 and the reaction force from the oscillator is zero, and the matrix 11 remains stationary, and the sound wave cannot propagate, resulting in the appearance of a sound insulation peak; when the sound wave frequency continues to increase, the reaction force of the oscillator on the matrix 11 weakens, the vibration mode of the matrix 11 is activated, and the sound wave can continue to propagate in the phononic crystal 5 structure, and a sound insulation valley appears at this time.

[0076] In some embodiments, Figure 5 As shown, the present invention also provides a liquid reservoir, which includes the above-mentioned shell structure.

[0077] Among them, when the compressor rotates at high speed, the vibrations generated by its reed valve, vane, bearing and other parts, as well as the vibrations caused by the different air pressures between the upper and lower chambers of the motor when the gas is compressed, are easily transmitted to the reservoir, causing the reservoir to vibrate violently and radiate noise outward at the same time. In addition, since the suction process of the compressor during operation is intermittent and periodic, the reservoir will produce suction noise, eddy current noise and cavity resonance noise.

[0078] In the above example, since the liquid reservoir adopts the above-mentioned shell structure, the acoustic black hole area 12 on the substrate 11 has the function of collecting the vibrations on the shell 4, and the phononic crystal 5 is arranged in the acoustic black hole area 12, and the phononic crystal 5 is in contact with the acoustic black hole area 12 through the elastomer 51, so that the phononic crystal 5 can be used to achieve efficient vibration reduction, thereby improving the overall vibration reduction and noise reduction effect of the phononic crystal unit cell structure of the present invention.

[0079] Among them, since the shell wall of the shell 4 constitutes the matrix 11 of the aforementioned phononic crystal unit cell structure, the shell wall of the shell 4 of the liquid reservoir, the elastomer 51 and the scatterer 52 together constitute the aforementioned phononic crystal unit cell structure. The shell 4 of the liquid reservoir is cylindrical, and the aforementioned phononic crystal unit cell structure is periodically arranged on the shell 4. Among them, the shell 4 of the liquid reservoir serves as the matrix 11 of the aforementioned phononic crystal unit cell structure, and the outer surface of the shell 4 is periodically attached with a phononic crystal 5 composed of an elastomer 51 and a scatterer 52, which together constitute a phononic crystal cylinder. Different from the conventional phononic crystal unit cell structure, the matrix 11 of the phononic crystal unit cell structure of the present invention is provided with an acoustic black hole structure (i.e., the aforementioned acoustic black hole region 12). The matrix 11 with the acoustic black hole region 12 can realize the "convergence" of the vibration of the liquid reservoir shell 4 to one point, that is, the vibration is "localized" in the center of the matrix 11, and then the phononic crystal 5 is used for vibration reduction to further reduce the vibration of the liquid reservoir.

[0080] In some embodiments, Figure 5 As shown, the aforementioned liquid storage device also includes an air intake pipe 1, an upper cover plate 2, a filter assembly 3, a straight pipe 6, a lower cover plate 7 and an air intake pipe 8.

[0081] In some embodiments, the present invention further provides a compressor, which includes the above-mentioned shell structure. Among them, because the compressor adopts the above-mentioned shell structure, the acoustic black hole region 12 on the substrate 11 has the function of collecting the vibration on the substrate 11, and the phononic crystal 5 is arranged at the acoustic black hole region 12, and the phononic crystal 5 is in contact with the acoustic black hole region 12 through the elastic body 51, so that the phononic crystal 5 can be used to achieve efficient vibration reduction, thereby improving the overall vibration reduction and noise reduction effect of the phononic crystal unit cell structure of the present invention.

[0082] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A phononic crystal unit cell structure, characterized in that: It comprises a substrate (11) and a phononic crystal (5), wherein the phononic crystal (5) comprises an elastic body (51) and a scatterer (52) arranged on the elastic body (51); The substrate (11) has an acoustic black hole region (12), the phononic crystal (5) is arranged in the acoustic black hole region (12), and the phononic crystal (5) is in contact with the acoustic black hole region (12) through the elastic body (51).

2. The phononic crystal unit cell structure according to claim 1, characterized in that: The thickness of the acoustic black hole region (12) gradually decreases from the outside to the inside, and the phononic crystal (5) is arranged at the point where the thickness of the acoustic black hole region (12) is the smallest through the elastic body (51).

3. The phononic crystal unit cell structure according to claim 2, characterized in that: A through hole (110) is provided in the middle of the acoustic black hole region (12), and the thickness of the acoustic black hole region (12) at the through hole (110) reaches a minimum; wherein the phononic crystal (5) is embedded in the through hole (110) through the elastomer (51).

4. The phononic crystal unit cell structure according to claim 3, characterized in that: The inner peripheral wall of the through hole (110) and the elastic body (51) are plug-fitted together.

5. The phononic crystal unit cell structure according to claim 4, characterized in that: The elastic body (51) is provided with an annular groove (901) extending in the circumferential direction, and the inner circumferential wall of the through hole (110) is inserted into the annular groove (901) in the circumferential direction.

6. The phononic crystal unit cell structure according to any one of claims 3 to 5, characterized in that: The elastic body (51) and the through hole (110) are interference-fitted.

7. The phononic crystal unit cell structure according to any one of claims 2 to 5, characterized in that: The thickness of the acoustic black hole region (12) gradually decreases from the outside to the inside according to a power exponent.

8. The phononic crystal unit cell structure according to any one of claims 2 to 5, characterized in that: The substrate (11) has a first surface (111) and a second surface (112) opposite to each other; the first surface (111) is provided with a groove (121); the second surface (112) has a first area surface (1121) opposite to the groove (121); the wall thickness of the substrate (11) between the first area surface (1121) and the groove (121) forms the acoustic black hole area (12).

9. The phononic crystal unit cell structure according to any one of claims 1 to 5, characterized in that: The elastic body (51) has inner holes penetrating through two ends; the scatterer (52) is columnar, and the scatterer (52) is nested in the inner hole.

10. The phononic crystal unit cell structure according to claim 9, characterized in that: When the thickness of the acoustic black hole region (12) on the substrate (11) gradually decreases from the outside to the inside, the substrate (11) is plate-shaped, and the maximum thickness of the substrate (11) is 0.5 mm ≤ t ≤ 5.0 mm; the elastic body (51) is annular, and the outer radius of the elastic body (51) is 10.0 mm ≤ r1 ≤ 30.0 mm, the inner radius of the elastic body (51) is 5.0 mm ≤ r2 ≤ 25.0 mm, and the height of the elastic body (51) is 5.0 mm ≤ h1 ≤ 25.0 mm; the scatterer (52) is cylindrical, and the radius of the scatterer (52) is r3 = r2, and the height of the scatterer (52) is 5.0 mm ≤ h2 ≤ 25.0 mm.

11. A housing structure, characterized in that: A phononic crystal unit cell structure comprising a shell (4) and any one of claims 1 to 10; The shell wall of the shell (4) constitutes the matrix (11) of the phononic crystal unit cell structure.

12. A liquid receiver or a compressor, characterized in that: The invention comprises the housing structure described in claim 11.

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