Lower shell cover structure and rotor compressor

Abstract

The invention relates to the technical field of compressors, in particular to a lower shell cover structure and a rotor compressor. The lower shell cover structure comprises a lower shell cover body and a column hole plate, the lower shell cover body is provided with a containing cavity, the column hole plate is provided with a plurality of through holes, column pipes are arranged at the through holes, the two ends of each column pipe penetrate in the axis direction of the corresponding through hole, and the column hole plate is arranged in the containing cavity. The column hole plate is arranged in the lower shell cover body, noise can vibrate in the cavity defined by the lower shell cover body and the column hole plate, the through holes and the column pipes are arranged, equivalently, the lower shell cover body and the column hole plate define a plurality of cavities capable of enabling the noise to vibrate, and then sound source noise in the containing cavity can be absorbed; and the outward radiation noise of the accommodating cavity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a lower shell cover structure and a rotary compressor. Background Art

[0002] A rotary compressor includes a housing, a motor assembly, and a pump body. The lower part of the pump body is an oil sump. During the operation of the rotary compressor, the interior of the housing is filled with mechanical and airflow noises. As Figure 1 shown, in the prior art, there is no additional noise absorption structure in the oil sump, resulting in the outward propagation of noises, and further making the working environment noise of the rotary compressor relatively large, and even affecting the physical health of the staff.

[0003] Therefore, there is an urgent need for a lower shell cover structure and a rotary compressor to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a lower shell cover structure and a rotary compressor, which can reduce the noise inside the rotary compressor, and further reduce the noise radiated outward by the rotary compressor.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A

[0007] lower shell cover structure, comprising a lower shell cover body and a perforated plate. The lower shell cover body has a receiving cavity. The perforated plate is provided with a plurality of through holes, and column tubes are provided at the through holes. Both ends of the column tubes are penetrated along the axial direction of the through holes. The perforated plate is disposed in the receiving cavity.

[0008] As a preferred technical solution of the above lower shell cover structure, the lower shell cover body and the perforated plate form a Helmholtz resonance cavity.

[0009] As a preferred technical solution of the above lower shell cover structure, the perforation rate of the perforated plate is less than 50%.

[0010] As a preferred technical solution of the above lower shell cover structure, the length of the column tubes is 5-20 mm.

[0011] As a preferred technical solution of the above lower shell cover structure, the inner diameter of the column tubes is 1-10 mm.

[0012] As a preferred technical solution of the above lower shell cover structure, the thickness of the main body of the perforated plate is 1-3 mm.

[0013] As a preferred technical solution of the above lower shell cover structure, one end of the column tube is connected to the through hole, and the other end of the column tube extends towards the closed bottom of the lower shell cover body.

[0014] As a preferred technical solution of the above-mentioned lower housing cover structure, the column hole plate is circular, and a plurality of the column tubes are symmetrically distributed in the radial direction of the column hole plate.

[0015] As a preferred technical solution of the above-mentioned lower housing cover structure, an installation portion is further provided at the edge of the column hole plate, and the installation portion is used for fitting and connecting with the side wall of the lower housing cover body.

[0016] A rotary compressor, the rotary compressor includes a housing, a motor assembly and a pump body, the rotary compressor further includes the lower housing cover structure in any one of the above preferred technical solutions, the lower housing cover structure is arranged at one end of the housing, the motor assembly and the pump body are both arranged in the housing, the motor assembly is connected with the pump body, the motor assembly is used for driving the pump body to work, and the accommodating cavity is filled with oil.

[0017] Advantages of the present invention:

[0018] The present invention provides a lower housing cover structure, which includes a lower housing cover body and a column hole plate. The lower housing cover body has an accommodating cavity. The column hole plate is provided with a plurality of through holes, and column tubes are arranged at the through holes. Both ends of the column tubes penetrate along the axis direction of the through holes, and the column hole plate is arranged in the accommodating cavity. By arranging the column hole plate in the lower housing cover body, it can make the noise vibrate in the cavity surrounded by the lower housing cover body and the column hole plate. The arrangement of a plurality of through holes and column tubes is equivalent to that the lower housing cover body and the column hole plate enclose a plurality of cavities that can make the noise vibrate, so as to absorb the source noise in the accommodating cavity and reduce the noise radiated from the accommodating cavity to the outside.

[0019] The present invention also provides a rotary compressor, which includes a housing, a motor assembly, a pump body and the above-mentioned lower housing cover structure. The lower housing cover structure is arranged at one end of the housing, the motor assembly and the pump body are both arranged in the housing, the motor assembly is connected with the pump body, the motor assembly is used for driving the pump body to work, and the accommodating cavity is filled with oil. Compared with the prior art, the rotary compressor can absorb the source noise inside and reduce the noise radiated from the rotary compressor to the outside, improving the user experience. Description of the drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0021] Figure 1 It is a structural schematic diagram of the lower housing cover structure provided by the prior art;

[0022] Figure 2Cross-sectional view of the lower shell cover structure provided by the embodiment of the present invention;

[0023] Figure 3 Cross-sectional view of the column hole plate provided by the embodiment of the present invention;

[0024] Figure 4 Axonometric view of the column hole plate provided by the embodiment of the present invention;

[0025] Figure 5 Frequency-sound pressure simulation calculation data diagram of the compressor provided by the embodiment of the present invention.

[0026] In the figure:

[0027] 1. Lower shell cover main body; 2. Column hole plate; 21. Mounting plate; 211. Through hole; 22. Mounting part; 23. Column tube. Detailed implementation manners

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0029] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0031] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying the operations, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0032] As Figures 2 to 4 shown, the present invention provides a lower shell cover structure, which includes a lower shell cover main body 1 and a column hole plate 2. The lower shell cover main body 1 has a receiving cavity. The column hole plate 2 is provided with a plurality of through holes 211. At the through holes 211, column tubes 23 are provided. Both ends of the column tubes 23 penetrate along the axial direction of the through holes 211. The column hole plate 2 is arranged in the receiving cavity, and there is oil in the receiving cavity, and the oil can vibrate in the receiving cavity.

[0033] Specifically, as Figures 2 to 3 shown, this lower shell cover structure is installed at the bottom of the rotor compressor housing. The lower shell cover structure includes a lower shell cover main body 1 and a column hole plate 2. The lower shell cover main body 1 is provided with a receiving cavity. The column hole plate 2 is arranged in the receiving cavity. The column hole plate 2 is provided with a plurality of through holes 211, and at each through hole 211, a column tube 23 is provided, so that both ends of the column tube 23 penetrate along the axial direction of the through hole 211. By arranging the column hole plate in the lower shell cover main body, noise can vibrate in the cavity surrounded by the lower shell cover main body and the column hole plate. The provision of a plurality of through holes 211 and column tubes 23 is equivalent to that the lower shell cover main body 1 and the column hole plate 2 enclose a plurality of cavities capable of vibrating noise, thereby being able to absorb the source noise in the receiving cavity and reducing the noise radiated outward from the receiving cavity.

[0034] Preferably, the lower shell cover main body 1 and the column hole plate 2 form Helmholtz resonance cavities. The provision of a plurality of through holes 211 and column tubes 23 is equivalent to setting a plurality of Helmholtz resonance cavities. According to the Helmholtz resonance sound absorption principle, the source noise in the receiving cavity can be absorbed, and the noise radiated outward from the receiving cavity is reduced. Specifically, in this embodiment, since the medium-frequency sound that the human ear can hear is 500 - 2000 Hz and the high-frequency sound is 2000 - 8000 Hz, and the sounds that make people feel uncomfortable are concentrated in the medium-high frequency sounds. Therefore, the resonance frequency of the Helmholtz resonance cavity is adjusted to 1500 - 4000 Hz, so as to absorb the sounds in the range of 1500 - 4000 Hz, prevent the sounds in the range of 1500 - 4000 Hz from radiating outward, and avoid the operators from receiving the sounds in the range of 1500 - 4000 Hz and feeling uncomfortable. Therefore, the concerned frequency band of this embodiment is 1500 - 4000 Hz.

[0035] Preferably, one end of the column tube 23 is connected to the through hole 211, and the other end of the column tube 23 extends in the direction of the closed bottom of the lower housing cover body 1. Specifically, one end of the column tube 23 is connected to the through hole 211, the other end of the column tube 23 extends in the direction of the closed bottom of the lower housing cover body 1, and the other end of the column tube 23 does not abut against the closed bottom of the lower housing cover body 1 to avoid damaging the Helmholtz resonance cavity structure.

[0036] Optionally, the end of the column tube 23 connected to the through hole 211 does not protrude from the end face of the column hole plate 2, which can prevent the column tube 23 from interfering with the structure above the column hole plate 2.

[0037] Optionally, in this embodiment, a column hole plate 2 is installed in the accommodation cavity. The column hole plate 2 further includes a mounting plate 21. The mounting plate 21 is provided with a plurality of through holes 211. The column tube 23 is connected to the through holes 211. The mounting plate 21 is used to connect to the side wall of the lower housing cover body 1. The vibration of the sound wave in a plurality of column tubes 23 is equivalent to the parallel connection of a plurality of Helmholtz resonance cavities, which can further absorb the sound source noise inside the accommodation cavity and reduce the noise radiated from the accommodation cavity to the outside. Of course, in some other embodiments, a plurality of column hole plates 2 can also be provided. The number of column hole plates 2 can be determined according to actual needs. The distance between the column hole plates 2 can also be determined according to actual needs. The number of column tubes 23 can be determined according to actual needs.

[0038] Optionally, there is oil in the accommodation cavity. The lower housing cover body 1 and the column hole plate 2 form a Helmholtz resonance cavity. The Helmholtz resonance cavity conforms to the following formula:

[0039]

[0040] where f is the resonance frequency of the Helmholtz resonance cavity, c is the sound velocity inside the Helmholtz resonance cavity, D is the thickness of the oil below the mounting plate, P is the perforation rate of the mounting plate 21, t is the length of the column tube 23, and d is the aperture of the column tube 23.

[0041] Specifically, by changing the thickness of the oil below the mounting plate, the perforation rate of the mounting plate 21, the length of the column tube 23, and the aperture of the column tube 23, the resonance frequency inside the Helmholtz resonance cavity can be adjusted, and the resonance frequency inside the Helmholtz resonance cavity can be controlled between 1500 - 4000 Hz. By adjusting the thickness of the oil below the mounting plate, the perforation rate of the mounting plate 21, the length of the column tube 23, and the aperture of the column tube 23, the staff can avoid the resonance frequency inside the Helmholtz resonance cavity exceeding the concerned frequency band. Of course, in some other embodiments, the range of the concerned frequency band can be determined according to design needs.

[0042] Optionally, the perforation rate of the mounting plate 21 is less than 50%, the length of the column tube 23 is 5-20 mm, and the aperture of the column tube 23 is 1-10 mm. Specifically, the thickness of the oil below the mounting plate can be artificially controlled. To prevent the resonance frequency in the Helmholtz resonance cavity from exceeding the concerned frequency band, the perforation rate of the mounting plate 21 is controlled within 50%. This can not only make the resonance frequency within the range of 1500-4000 Hz, but also enable the mounting plate 21 to have a certain strength, playing a role in strengthening the structure of the lower shell cover; the length of the column tube 23 is set to 5-20 mm, which can control the resonance frequency within the range of 1500-4000 Hz, avoiding the resonance frequency in the Helmholtz resonance cavity from exceeding the concerned frequency band; the aperture of the column tube 23 is set to 1-10 mm, which can not only make the resonance frequency within the range of 1500-4000 Hz, but also prevent the column tube 23 from being too long and touching the bottom of the lower shell cover main body 11, thus damaging the structure of the Helmholtz resonance cavity.

[0043] Preferably, the column hole plate 2 is circular, and several column tubes 23 are symmetrically distributed about the radial direction of the column hole plate 2. Specifically, in this embodiment, the lower shell cover main body 1 is circular, the column hole plate 2 is installed in the lower shell cover main body 1, and the outer peripheral side wall of the column hole plate 2 is connected to the inner wall of the lower shell cover main body 1. In order to enable the outer peripheral side wall of the column hole plate 2 to fit the inner wall of the lower shell cover main body 1, the column hole plate 2 is set to be circular, which can ensure the sealing of the Helmholtz resonance cavity and avoid forming a Helmholtz resonance cavity outside the concerned frequency band. Of course, in some other embodiments, the shape of the column hole plate 2 can be determined according to the shape of the lower shell cover main body 1.

[0044] Optionally, the distribution of several column tubes 23 is the same as that of several through holes 211, and the distribution of several through holes 211 conforms to the following formula:

[0045]

[0046] where B is the hole pitch between adjacent through holes 211.

[0047] Specifically, in this embodiment, the column hole plate 2 is provided with several column tubes 23, and several column tubes 23 are evenly distributed in a rectangle in the middle of the mounting plate 21. By determining the perforation rate of the mounting plate 21 and the aperture of the column tube 23, the distance between adjacent column tubes 23 can be determined, ensuring that the distance between adjacent column tubes 23 is the same, which is convenient for processing and production. Of course, in some other embodiments, the distribution pattern of several column tubes 23 can also be circular or other shapes, and the calculation formula for the distance between adjacent column tubes 23 is determined according to the actual distribution shape of several column tubes 23.

[0048] Optionally, in one embodiment, the sound speed inside the Helmholtz resonance cavity is 1200 m / s. When the thickness of the oil is 30 mm, the aperture of the column tube 23 is 5 mm, the length of the column tube 23 is 19 mm, and the perforation rate of the mounting plate 21 is 10%, the resonance frequency of the Helmholtz resonance cavity is calculated to be 2299 Hz, and the spacing between adjacent column tubes 23 is 14 mm.

[0049] Preferably, as Figure 3 and Figure 4 shown, the column hole plate 2 is further provided with a mounting portion 22 for connecting with the lower housing cover body 1. Specifically, the mounting portion 22 is disposed on the outer periphery of the mounting plate 21 and is used for connecting with the lower housing cover body 1. In this embodiment, the setting of the mounting portion 22 can increase the contact area between the mounting plate 21 and the lower housing cover body 1, so as to firmly connect the mounting plate 21 and the lower housing cover body 1, prevent the mounting plate 21 from separating from the lower housing cover body 1, and avoid the mounting plate 21 falling off to the bottom of the lower housing cover body 1 and thus damaging the Helmholtz resonance cavity structure; at the same time, the setting of the mounting portion 22 can reduce the thickness of the mounting plate 21, avoid wasting materials, thereby making the lower housing cover structure lightweight, and further making the rotor compressor lightweight.

[0050] Optionally, the mounting plate 21 is welded to the side wall of the lower housing cover body 1, which can make the connection between the mounting plate 21 and the lower housing cover body 1 firm. Of course, in some other embodiments, the mounting portion 22 and the mounting plate 21 can also abut against the side wall of the lower housing cover body 1 to make the mounting plate 21 and the lower housing cover body 1 stably connected.

[0051] Optionally, in order to make the connection between the mounting plate 21 and the lower housing cover body 1 firm, the mounting portion 22 is an annular structure and is arranged along the circumferential direction of the mounting plate 21. Specifically, in this embodiment, the mounting portion 22 covers the entire outer periphery of the mounting plate 21, which can make the contact area between the mounting portion 22 and the lower housing cover body 1 larger, so that the connection between the mounting plate 21 and the lower housing cover body 1 is more firm. Of course, in some other embodiments, the setting manner of the mounting portion 22 can also be arranged at intervals along the circumferential direction of the mounting plate 21, and the number of the mounting portions 22 is determined according to the actual required connection strength.

[0052] Optionally, the outer periphery of the mounting plate 21 is turned over to form the mounting portion 22, which can improve the overall strength of the mounting plate 21 and the mounting portion 22, reduce the gap between the mounting plate 21 and the mounting portion 22, reinforce the lower housing cover structure, and make the lower housing cover structure more stable.

[0053] Optionally, the thickness of the main body of the column hole plate 2 is 1-3 mm. Specifically, the main body of the column hole plate 2 is the mounting plate 21, and the wall thickness of the mounting plate 21 is 1-3 mm. If the wall thickness of the mounting plate 21 is too thin, the stiffness of the mounting plate 21 will be insufficient, causing the mounting plate 21 to vibrate, which will in turn affect the resonance frequency of the sound in the column tube 23. Therefore, the wall thickness of the mounting plate 21 should be greater than 1 mm to meet the stiffness requirements and prevent vibration. At the same time, considering production costs and the weight of the mounting plate 21, the wall thickness of the mounting plate 21 is less than 3 mm, which can reduce material usage, save production costs, reduce the weight of the mounting plate 21, make the lower shell cover structure lighter, and thus make the rotary compressor lighter.

[0054] Preferably, in this embodiment, the column tube 23, the mounting plate 21, and the mounting portion 22 are integrally provided, which can make the structure of the column hole plate 2 stable. While forming a Helmholtz resonance cavity between the column hole plate 2 and the main body of the lower shell cover 1, it can also further reinforce the structure of the lower shell cover, make the structure of the lower shell cover more stable, and thus make the structure of the rotary compressor more stable, improving the service life of the rotary compressor.

[0055] Preferably, as Figure 5 shown, in order to highlight the sound absorption effect of the lower shell cover structure provided by the present invention, through acoustic-solid coupling simulation analysis and calculation, where the solid line is the frequency-sound pressure curve provided by the present invention, and the dashed line is the frequency-sound pressure curve provided by the prior art. When the frequency of the sound is 2300 Hz, the noise generated by the prior art is 113 dB, and the noise generated by this solution is 107 dB. Therefore, the structure noise of the lower shell cover structure provided by the present invention is reduced by 6 dB compared to the original lower shell cover. Therefore, the lower shell cover structure provided by the present invention has a good sound absorption effect.

[0056] The present invention also provides a rotary compressor, including a housing, a motor assembly, and a pump body. The rotary compressor further includes the lower shell cover structure in the above embodiment. The lower shell cover structure is disposed at one end of the housing. The motor assembly and the pump body are both disposed inside the housing. The motor assembly is connected to the pump body, and the motor assembly is used to drive the pump body to work. There is oil in the accommodation cavity. The rotary compressor further includes other necessary components that make up the rotary compressor in the prior art.

[0057] In addition, the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Lower shell cover structure, characterized in that, It includes a lower shell cover body (1) and a column hole plate (2). The lower shell cover body (1) has a receiving cavity. The column hole plate (2) is provided with a number of through holes (211). A column tube (23) is provided at the through hole (211). Both ends of the column tube (23) penetrate along the axial direction of the through hole (211). The column hole plate (2) is arranged in the receiving cavity.

2. The lower shell cover structure according to claim 1, characterized in that, The lower shell cover body (1) and the column hole plate (2) form a Helmholtz resonance cavity.

3. The lower shell cover structure according to claim 2, characterized in that, The perforation rate of the column hole plate (2) is less than 50%.

4. The lower shell cover structure according to claim 2, characterized in that, The length of the column tube (23) is 5 - 20 mm.

5. The lower shell cover structure according to claim 2, characterized in that, The inner diameter of the column tube (23) is 1 - 10 mm.

6. The lower shell cover structure according to claim 2, characterized in that, The thickness of the main body of the column hole plate (2) is 1 - 3 mm.

7. The lower shell cover structure according to claim 1, characterized in that, One end of the column tube (23) is connected to the through hole (211), and the other end of the column tube (23) extends towards the closed bottom of the lower shell cover body (1).

8. The lower shell cover structure according to claim 1, characterized in that, The column hole plate (2) is circular, and a number of the column tubes (23) are symmetrically distributed with respect to the radial direction of the column hole plate (2).

9. The lower shell cover structure according to claim 1, characterized in that, An installation part (22) is further provided at the edge of the column hole plate (2), and the installation part (22) is used for fitting connection with the side wall of the lower shell cover body (1).

10. Rotary compressor, the rotary compressor comprising a housing, a motor assembly and a pump body, characterized in that, The rotary compressor further includes a lower shell cover structure as described in any one of claims 1 - 9. The lower shell cover structure is arranged at one end of the outer shell. The motor assembly and the pump body are both arranged in the outer shell. The motor assembly is connected to the pump body, and the motor assembly is used to drive the pump body to work. There is oil in the receiving cavity.

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