Screw compressor

Abstract

The application discloses a screw compressor, which comprises a shell, a pair of rotors and a plurality of sound-absorbing devices. The plurality of resonance sound-absorbing devices are arranged on the inner wall of the rotor cavity, and each of the resonance sound-absorbing devices is configured to have a predetermined natural frequency, so as to absorb and attenuate pressure pulsation energy by forming resonance with sound waves having the predetermined natural frequency, thereby reducing noise. In the screw compressor of the application, the resonance sound-absorbing devices are arranged on the inner wall of the rotor cavity, so that the noise can be directly and more rapidly and efficiently eliminated at the position with the highest gas pressure and the position where the pressure pulsation is generated. Furthermore, the resonance sound-absorbing devices of the application can ensure that the resonance sound-absorbing devices do not affect the operation of the screw compressor by arranging the positions of the communication channels and the openings.

Description

Technical Field

[0001] This application relates to the field of compressors, and more particularly to a screw compressor. Background Technology

[0002] A screw compressor includes a pair of rotors. The meshing of the rotor teeth creates changes in the volume of the basic unit volume formed by the toothed space, thus completing the gas intake, compression, and discharge processes. Because the screw compressor forms discontinuous inter-tooth volumes through rotor meshing, the intake and exhaust chambers are periodically connected to the working chamber, resulting in unstable gas flow. This causes pressure pulsations during the intake and exhaust processes, which in turn cause compressor vibration and noise. Summary of the Invention

[0003] This application provides a screw compressor, including a housing, a pair of rotors, and a plurality of silencers. The housing includes a rotor housing having a rotor cavity and an inner wall defining the rotor cavity. The pair of rotors are disposed within the rotor cavity, each rotor having rotor teeth. A compression cavity can be formed between the rotor teeth of the pair of rotors and the inner wall of the rotor cavity. The pair of rotors have a rotor intake inlet and a rotor exhaust outlet. The pair of rotors are configured such that, with rotation of the pair of rotors, the compression cavity periodically undergoes a volume change, allowing gas in the compression cavity to move from the rotor intake inlet, after compression and pressure increase, to the rotor exhaust outlet. The plurality of resonant silencers are disposed on the inner wall of the rotor cavity. Each resonant silencer is configured to have a predetermined natural frequency to absorb and attenuate pressure pulsation energy by resonating with a sound wave having the predetermined natural frequency, thereby reducing noise.

[0004] Based on the above, the resonant silencing device is an acoustic superstructure, wherein at least a portion of the resonant silencing device is configured to have different predetermined intrinsic frequencies.

[0005] According to the above, the resonant silencing device includes a resonant cavity and at least one communicating channel, wherein the at least one communicating channel is in fluid communication with the resonant cavity. Each of the resonant silencing devices is configured such that, as the pair of rotors rotate, a pressure difference exists between the resonant cavity and a compression chamber outside the resonant silencing device. The at least one communicating channel provides fluid communication between the resonant cavity and the compression chamber outside the resonant silencing device, allowing liquid in the compression chamber to enter the resonant cavity or exit the resonant cavity through the at least one communicating channel.

[0006] According to the above, in the extending direction of the at least one connecting channel, the bottom of the at least one connecting channel at least at one end in the compression cavity is not higher than one end in the resonant cavity, so that the liquid in the resonant cavity can be discharged into the compression cavity through the at least one connecting channel.

[0007] Based on the above, the inner wall of the rotor cavity includes a front wall and a cavity wall, the cavity wall surrounding the resonant cavity. The bottom of the at least one communicating channel at one end within the resonant cavity is not higher than the cavity wall at that point, so that liquid in the resonant cavity can enter the at least one communicating channel.

[0008] According to the above, the inner surface of the bottom of the at least one communicating channel is tangent to the inner surface of the cavity wall.

[0009] According to the above, the inner wall of the rotor cavity also includes a rear wall, the inner surfaces of which are opposite to those of the front wall. The inner surface of the front wall of the rotor cavity is a partially spherical surface, and the inner surface of the rear wall is a smooth curved surface.

[0010] Based on the above, the inner surface of the cavity wall of the resonant cavity is spherical.

[0011] According to the above, the at least one connecting channel includes a first connecting channel and a second connecting channel. The resonant silencing device is configured such that, as the pair of rotors rotate, the resonant cavity is first connected to a high-pressure compression cavity via the second connecting channel, and then connected to a low-pressure compression cavity via the first connecting channel, so as to discharge the liquid in the resonant cavity.

[0012] According to the above, the rotor teeth of the pair of rotors have tooth tips. The first connecting channel and the second connecting channel respectively form a first opening and a second opening on the front wall. The first opening and the second opening of each of the resonant silencing devices are configured to be located within the tooth tip range of the rotor teeth of the pair of rotors, such that the first opening and the second opening of each of the resonant silencing devices cannot simultaneously communicate with two compression cavities in fluid.

[0013] According to the above, the distance D2 between the outer edges of the first opening and the second opening of each of the resonant silencing devices in the width direction of the rotor teeth is less than the width D1 of the tooth tip of the corresponding rotor.

[0014] According to the above, the line connecting the center of the first opening and the second opening of each of the resonant silencing devices is not parallel to the extension direction of the rotor teeth.

[0015] According to the above, the tooth tip of each pair of rotors has a centerline parallel to the extension direction of the rotor teeth, and the first opening and the second opening of each resonance silencing device are located on both sides of the centerline.

[0016] Based on the above, the inner diameter of the first connecting channel is not less than that of the second connecting channel.

[0017] Based on the above, each of the resonant silencing devices is configured to form the predetermined natural frequency through the volume of the resonant cavity, the length of the connecting channel, and the inner diameter of the connecting channel.

[0018] According to the above, the pair of rotors includes a male rotor and a female rotor, the rotor teeth include male rotor teeth and female rotor teeth, the male rotor teeth and the female rotor teeth mesh with each other, the rotor cavity includes a male rotor cavity and a female rotor cavity, the male rotor is disposed in the male rotor cavity, and the female rotor is disposed in the female rotor cavity. The resonance silencing device is disposed on the inner wall of the rotor cavity defining the female rotor cavity.

[0019] According to the above, the rotor housing includes a body and a mounting plate that are connected to each other. The mounting plate forms at least a portion of the inner wall of the rotor cavity. The plurality of resonance silencing devices are disposed on the mounting plate. The mounting plate and the plurality of resonance silencing devices are formed by 3D printing, casting or CNC machining.

[0020] Other features, advantages, and embodiments of this application may be illustrated or become apparent from the following detailed description and accompanying drawings. Furthermore, it should be understood that the above description and the following detailed description are exemplary and intended to provide further explanation, without limiting the scope of the claimed application. However, the detailed description and specific examples only indicate preferred embodiments of this application. Various changes and modifications within the spirit and scope of this application will become apparent to those skilled in the art through these detailed descriptions. Attached Figure Description

[0021] Figure 1A This is a perspective structural diagram of a screw compressor according to an embodiment of this application;

[0022] Figure 1B for Figure 1A The side view of the screw compressor shown;

[0023] Figure 2A for Figure 1B The diagram shows a cross-sectional view of the screw compressor along line AA.

[0024] Figure 2B for Figure 1B The diagram shows a cross-sectional view of the screw compressor along line BB.

[0025] Figure 3A for Figure 1A A perspective view of one embodiment of the rotor housing;

[0026] Figure 3B for Figure 3A An exploded view of the rotor housing;

[0027] Figure 4A for Figure 1A A perspective view of another embodiment of the rotor housing;

[0028] Figure 4B for Figure 4A An exploded view of the rotor housing;

[0029] Figure 5 for Figure 3A A partial unfolded view of the inner wall of the rotor cavity in one embodiment;

[0030] Figures 6A-6C This shows the female rotor during rotation. Figure 5 The positional relationship between the resonance silencing device and the tooth tip;

[0031] Figure 7A for Figure 5 A schematic diagram of a structural embodiment of a resonance silencing device;

[0032] Figure 7B for Figure 7A Axial cross-sectional view of the resonance silencing device shown;

[0033] Figure 8A for Figure 5 A schematic diagram of another embodiment of the resonance silencing device in the diagram;

[0034] Figure 8B for Figure 8A Axial cross-sectional view of the resonance silencing device shown;

[0035] Figure 9 for Figure 3A A partial unfolded view of another embodiment of the inner wall of the rotor cavity;

[0036] Figures 10A-10E This shows the female rotor during rotation. Figure 9 The positional relationship between the resonance silencing device and the tooth tip;

[0037] Figure 11A for Figure 9 A schematic diagram of a structural embodiment of a resonance silencing device;

[0038] Figure 11B for Figure 11A Axial cross-sectional view of the resonance silencing device shown;

[0039] Figure 12A for Figure 9 A schematic diagram of another embodiment of the resonance silencing device in the diagram;

[0040] Figure 12B for Figure 12A The axial cross-sectional view of the resonance silencing device shown. Detailed Implementation

[0041] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that although directional terms such as "front," "rear," "upper," "lower," "left," "right," "top," and "bottom" are used in this application to describe various exemplary structural parts and elements, their use is merely for illustrative purposes and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this application can be arranged in different orientations, these directional terms are for illustrative purposes only and should not be considered as limiting.

[0042] Figure 1A and Figure 1B The structure of a screw compressor 100 according to one embodiment of this application is shown to illustrate the external structure of the screw compressor 100. Figure 1A This is a three-dimensional structural diagram of the screw compressor 100. Figure 1B for Figure 1A A side view. (e.g.) Figure 1A and Figure 1B As shown, the screw compressor 100 includes a housing 101, which is generally elongated cylindrical in shape and includes a motor housing 102, a rotor housing 103, and an exhaust housing 104 connected sequentially along its length. The motor housing 102 has an intake port 105 and is primarily used to house the motor 212 (see [reference]). Figure 2A (As shown). The rotor housing 103 has a rotor cavity 213 (see...). Figure 2A As shown, the rotor cavity 213 is used to accommodate a pair of rotors 221, 222 rotating therein. The exhaust housing 104 has an exhaust port 106 for discharging compressed gas from the exhaust port 106. Thus, after the gas enters the housing 101 from the intake port 105, it flows approximately along its length, is compressed, and is discharged from the housing 101 from the exhaust port 106.

[0043] Figure 2A and Figure 2B As shown Figure 1A The internal structure of the screw compressor 100 shown is illustrated. Figure 2AThis shows a cross-sectional view of the screw compressor 100 along line AA. Figure 2B A cross-sectional view of the screw compressor 100 along line BB is shown. Figure 2A and Figure 2B As shown, the rotor cavity 213 houses a pair of rotors arranged in a generally parallel and side-by-side configuration. The pair of rotors 221 and 222 includes a male rotor 221 and a female rotor 222. The male rotor 221 is connected to a motor 212, and the male rotor 221 and female rotor 222 mesh with each other, allowing the pair of rotors 221 and 222 to be driven by the motor 212 to rotate independently. The male rotor 221 and female rotor 222 have mutually parallel axes, and the male rotor 221 and female rotor 222 rotate about their respective axes. In this embodiment, the direction of extension of the axis is considered the axial direction.

[0044] The male rotor 221 has helically extending rotor teeth 231, and the female rotor 222 has helically extending rotor teeth 232. The rotor teeth 231 of the male rotor 221 and the rotor teeth 232 of the female rotor 222 mesh with each other, forming a plurality of compression cavities 225 between the meshing rotor teeth 231 and 232 and the inner wall 218 defining the rotor cavity 213. The rotor cavity 213 includes a male rotor cavity 237 and a female rotor cavity 238. The inner wall 218 includes a male rotor cavity inner wall 236 and a female rotor cavity inner wall 235. The male rotor cavity 237 is defined by the male rotor cavity inner wall 236, and the female rotor cavity 238 is defined by the female rotor cavity inner wall 235. The male rotor 221 is disposed in the male rotor cavity 237, and the tooth tips 233 of the rotor teeth 231 of the male rotor 221 are in sealing contact with the inner wall 236 of the male rotor cavity. Similarly, the female rotor 222 is disposed in the female rotor cavity 238, and the tooth tips 234 of the rotor teeth 232 of the female rotor 222 are in sealing contact with the inner wall 235 of the female rotor cavity. In this embodiment, sealing contact means that there are very small tooth tip gaps (not shown in the figure) between the tooth tips 233 and the inner wall 236 of the male rotor cavity, and between the tooth tips 234 and the inner wall 235 of the female rotor cavity. The tooth tip gaps are used for the flow of lubricating oil so that a closed compression cavity 225 can be formed between the rotor teeth and the inner wall of the rotor cavity. In this embodiment, the tooth tip refers to the top of the rotor tooth, the part used to form the tooth gap with the corresponding inner wall of the rotor cavity.

[0045] As the pair of rotors 221 and 222 rotate, each compression chamber 225 experiences volume changes due to the intrusion or disengagement of the corresponding rotor teeth, gradually compressing the gas within it. In each rotation cycle, several identical compression chambers 225 sequentially undergo the same working process, resulting in periodic volume changes in each chamber. The pair of rotors 221 and 222 have a rotor intake inlet 223 and a rotor exhaust outlet 224. Each compression chamber 225 moves independently axially from the rotor intake inlet 223 to the rotor exhaust outlet 224. At any given moment during the operation of the screw compressor 100, the volumes and pressures of the various compression chambers 225 are different, and their pressures gradually increase in the direction of movement. When the screw compressor 100 is running, in one rotation cycle, the compression chamber 225 first connects to the rotor intake inlet 223, allowing gas to be drawn into the compression chamber 225 from the rotor intake inlet 223. As the pair of rotors 221 and 222 rotate, the compression chamber 225 gradually moves axially toward the rotor exhaust outlet 224. The volume of the compression chamber 225 gradually decreases, causing the gas within it to be gradually compressed and the gas pressure to gradually increase. Once the compression chamber 225 moves to communicate with the rotor exhaust outlet 224, the compressed gas is discharged from the rotor exhaust outlet 224. This completes one intake, compression, and exhaust process. During the meshing of the pair of rotors, the volume of the compression chamber decreases, and the gas within the compression chamber possesses noise energy. Furthermore, during the meshing of the pair of rotors, the rotors periodically pass through different positions on the inner wall of the chamber, inducing periodic pressure changes acting on the wall surface, thus generating high-energy pressure pulsations at the inner wall of the chamber, which also causes vibration and noise in the screw compressor 100.

[0046] In this embodiment, the screw compressor 100 further includes several resonant silencing devices 210, which are disposed on the inner wall 218 of the rotor cavity. Each of the resonant silencing devices 210 has a predetermined natural frequency. Thus, during the gas compression process, the screw compressor 100 can absorb and attenuate the pressure pulsation energy acting on the inner wall 218 of the rotor cavity and in the compression cavity 225 by resonating with the sound waves with the predetermined natural frequency through the resonant silencing devices 210, thereby reducing the dynamic response of the housing 101 and reducing the vibration of the screw compressor 100 and the noise caused by the vibration.

[0047] Figure 3A and Figure 3B An embodiment of the rotor housing 103 is shown, wherein Figure 3A This is a three-dimensional structural diagram of the rotor housing 103. Figure 3B for Figure 3A An exploded view. (For example...) Figure 3A As shown, in this embodiment, several resonance silencing devices 210 are disposed on the inner wall 235 of the female rotor cavity to absorb and attenuate the pressure pulsation energy acting on the inner wall 235 of the female rotor cavity. This is because the tooth tips 234 of the rotor teeth 232 of the female rotor 222 are more gently sloping than the tooth tips 233 of the rotor teeth 231 of the male rotor 221, making the corresponding area of ​​the sealing contact between the tooth tips 234 of the female rotor 222 and the inner wall 235 of the female rotor cavity larger than the corresponding area of ​​the sealing contact between the tooth tips 233 of the male rotor 221 and the inner wall 236 of the male rotor cavity. In some other embodiments, depending on the shape of the tooth tips, resonance silencing devices may also be disposed on the inner wall 236 of the male rotor cavity, or resonance silencing devices may be disposed on the entire inner wall 218 of the rotor cavity.

[0048] like Figure 3B As shown, the rotor housing 103 includes a body 341 and a mounting portion 340 connected to each other, and several resonance silencing devices 210 are disposed on the mounting portion 340. In this embodiment, the mounting portion 340 is used to form the inner wall 218 of the rotor cavity. That is, the shape of the mounting portion 340 is configured to define the rotor cavity 213 and accommodate a pair of rotors 221 and 222.

[0049] When manufacturing the rotor housing 103, the mounting part 340 and the resonance silencing device 210 are first integrally formed using 3D printing, casting, or CNC machining. Then, the mounting part 340 is connected to the body 341 to install these resonance silencing devices 210 on the inner wall 218 of the rotor cavity. As an example, the mounting part 340 can be connected to the body 341 by interference fit, riveting, welding, or gluing. In some cases... Figure 3A and Figure 3B In the illustrated embodiment, the mounting portion 340 is shaped as an annular shape matching the body 341. Its inner side is used to house the resonance silencing device 210, and its outer side has several protruding connection points 342. Several blind holes 343 are provided at corresponding positions on the inner side of the body 341. Through the interference fit between the connection points 342 and the blind holes 343, the mounting portion 340 can be connected to the inner side of the body 341, thereby forming the inner wall 218 of the rotor cavity.

[0050] The mounting part 340 can be made of the same material as the body 341, or it can be made of a different material. In this embodiment, the mounting part 340 is made of an aluminum alloy material with a certain expansion capacity, while the body 341 is made of cast steel or cast iron material with higher strength.

[0051] Those skilled in the art will understand that in some embodiments, the mounting portion 340 may not be included, and these resonance silencing devices 210 may be integrally formed directly with the inner wall 218 of the rotor cavity. As an example, when manufacturing the rotor housing 103, the rotor housing 103 is integrally formed by a 3D printing process to directly form these resonance silencing devices 210 on the inner wall 218 of the rotor cavity of the rotor housing 103. However, due to the high cost of 3D printing and CNC machining, the integrally formed rotor housing 103 is more expensive than the mounting portion 340, which can be manufactured separately.

[0052] Figure 4A and Figure 4B Another embodiment of rotor housing 403 is shown, wherein Figure 4A This is a three-dimensional structural diagram of rotor housing 403. Figure 4B for Figure 4A An exploded view. Similar to rotor housing 103, rotor housing 403 also includes an interconnected mounting portion 440 and body 441, with several resonance silencing devices 210 disposed on the mounting portion 440. The difference is that, in this embodiment, the inner wall 418 of the rotor cavity of rotor housing 403 is formed jointly by the mounting portion 440 and the body 441. That is, the mounting portion 440 only forms a part of the inner wall 418 of the rotor cavity. Specifically, the inner wall 418 of the rotor cavity has a mounting groove 445, and the mounting portion 440 is connected to the mounting groove 445 by an interference fit or other means.

[0053] In this embodiment, the mounting portion 440 forms only a part of the inner wall 418 of the rotor cavity. Therefore, the size of the mounting portion 440 is smaller than that of the mounting portion 340. In comparison, the cost of the rotor housing 403 is lower than that of the rotor housing 103. Accordingly, the rotor housing 403 can only have the resonance silencing device 210 provided in a local part of the inner wall 418 of the rotor cavity, and the number of resonance silencing devices 210 that can be provided is also relatively small.

[0054] Figure 5 A partial unfolded view of an embodiment showing the inner wall 218 of the rotor cavity equipped with a resonance silencing device 210 is shown, illustrating the arrangement of the resonance silencing device 210. (As shown) Figure 5As shown, several resonant silencing devices 210 arranged sequentially are provided on the inner wall 218 of the rotor cavity. These resonant silencing devices 210 are acoustic superstructures. Each resonant silencing device 210 has a predetermined natural frequency. These resonant silencing devices 210 absorb and attenuate the pressure pulsation energy acting on the inner wall 218 of the rotor cavity by resonating with sound waves with the same predetermined natural frequency in the noise in the compression cavity 225, thereby reducing the dynamic response of the housing 101 and reducing the vibration of the screw compressor 100 and the noise caused by the vibration. When at least some of these resonant silencing devices 210 have different predetermined natural frequencies, these resonant silencing devices 210 can reduce noise over a wide frequency range.

[0055] Each resonant silencing device 210 includes a resonant cavity 753 and at least one connecting channel 755 (see [link]). Figure 7B As shown in the diagram, in this embodiment, at least one communication channel includes a first communication channel 755. The first communication channel 755 extends from the outside to the inside into the resonant cavity 753 to form a resonant noise reduction structure. The first communication channel 755 forms a first opening 552 on the inner wall 218 of the rotor cavity. The first communication channel 755 and the first opening 552 are in fluid communication with the resonant cavity 753. Furthermore, as the pair of rotors 221 and 222 rotate, the first communication channel 755 and the first opening 552 can also be in fluid communication with the compression cavity 225. Liquids such as lubricating oil mixed in the gas in the compression cavity 225 can enter the resonant cavity 753 or be discharged from the resonant cavity 753 through the first communication channel 755 and the first opening 552. Thus, the liquid will not affect the resonant noise reduction process of the resonant noise reduction device 210.

[0056] As the pair of rotors 221 and 222 rotate, the rotor teeth 232 of the female rotor 222 move axially, and the first opening 552 can be closed or opened by the tooth tips 234 of the corresponding female rotor teeth 232. When the first opening 552 is closed, the resonant cavity 753 is not in fluid communication with the compression cavity 225; when the first opening 552 is opened, the resonant cavity 753 is in fluid communication with the compression cavity 225 through the first communication channel 755.

[0057] Those skilled in the art will understand that each resonant silencing device 210 may also include a greater number of connecting channels and openings, which will be described in detail later in conjunction with embodiments.

[0058] Figures 6A-6C The diagram illustrates the positional relationship between the resonance silencing device 210 and the tooth tip 234 during the rotation of a pair of rotors. Figures 6A-6CAs shown, with the rotation of a pair of rotors, the compression chamber 225 moves axially in the direction indicated by arrow 660. The helical rotor teeth 232 also move axially relative to the inner wall 218 of the rotor chamber in the direction indicated by arrow 660. The area above the tooth tip 234 is the high-pressure side, and the area below the tooth tip 234 is the low-pressure side. In this embodiment, as described above, two compression chambers 225 are formed on the upper and lower sides of the tooth tip 234, respectively. These two compression chambers 225 include a first compression chamber 661 and a second compression chamber 662. The first compression chamber 661 is located above the tooth tip 234, and the second compression chamber 662 is located below the tooth tip 234. The gas pressure in the first compression chamber 661 is greater than the gas pressure in the second compression chamber 662. That is, the first compression chamber 661 is a high-pressure compression chamber, and the second compression chamber 662 is a low-pressure compression chamber. It should be noted that high pressure and low pressure here are relative to each other. For ease of display, Figures 6A-6C Only a portion of the tooth tip 234 of rotor tooth 232 is shown in the figure.

[0059] like Figure 6A As shown, the resonant silencing device 210 is entirely located in the first compression cavity 661 above the tooth tip 234 of the rotor teeth 232. The first opening 552 of the resonant silencing device 210 is in fluid communication with the first compression cavity 661. At this time, the resonant silencing device 210 absorbs and attenuates the pressure pulsation energy in the first compression cavity 661 by resonating with sound waves of certain frequencies in the first compression cavity 661. At this time, the first opening 552 of the resonant silencing device 210 has the same pressure as the first compression cavity 661. As the pair of rotors rotate, the pressure in the first compression cavity 661 continuously increases, and fluids such as lubricating oil in the cavity 661 flow into the resonant cavity 753. With further rotation of the pair of rotors, the tooth tip 234 of the rotor teeth 232 moves relative to the resonant silencing device 210 in the direction of arrow 660, and the tooth tip 234 and the resonant silencing device 210 reach... Figure 6B The location shown.

[0060] like Figure 6B As shown, the resonant silencing device 210 is located within the area of ​​the tooth tip 234, and the first opening 552 is initially closed by the tooth tip 234. At this time, the resonant silencing device 210 is not in fluid communication with the compression cavity 225, and the resonant cavity 753 and the first opening 552 still have the same high pressure as when the first compression cavity 661 was disengaged. As the pair of rotors continue to rotate, the tooth tip 234 continues to move relative to the resonant silencing device 210 in the direction of arrow 660, and the tooth tip 234 and the resonant silencing device 210 reach... Figure 6C The location shown.

[0061] like Figure 6CAs shown, a portion of the resonant silencing device 210 remains within the area of ​​the tooth tip 234, while another portion is located in the second compression cavity 662 below the tooth tip 234. The first opening 552 is opened and fluidly communicates with the second compression cavity 662. At this time, the resonant cavity 753 has the same high pressure as when it is separated from the first compression cavity 661, thus creating a pressure difference between the resonant cavity 753 and the second compression cavity 662. This pressure difference causes the fluid in the resonant cavity 753 to be automatically discharged into the second compression cavity 662 through the first connecting channel 755 and the first opening 552. Furthermore, due to the pressure change acting on the inner wall of the rotor cavity at the resonant silencing device 210, the resonant silencing device 210 can absorb and attenuate the pressure pulsation energy acting on the inner wall of the cavity at the resonant silencing device 210 by resonating with sound waves of certain frequencies.

[0062] As the pair of rotors continue to rotate, the tooth tip 234 continues to move relative to the resonant muffler 210 in the direction of arrow 660 until the entire resonant muffler 210 is located in the second compression cavity 662. For the tooth tip of the next rotor tooth (not shown in the figure), the tooth tip and the resonant muffler 210 are again in the same position. Figure 6A The position is shown. Therefore, the tips of the rotor teeth circulate relative to the resonance silencing device 210. The resonance silencing device 210 sequentially absorbs and attenuates the pressure pulsation energy in each compression cavity and at the cavity wall through resonance, and promptly discharges lubricating oil and other liquids that have entered the resonance cavities of each resonance silencing device 210.

[0063] Figure 7A and Figure 7B The specific structure of one embodiment of the resonant silencing device 210 is shown. Figure 7A This is a three-dimensional perspective schematic diagram of the resonance silencing device 210. Figure 7B for Figure 7A An axial cross-sectional view passing through the center of the first opening 552. To more clearly illustrate the specific structure of the resonance silencing device 210. Figure 7A The resonant silencing device 210 in the diagram schematically shows a cylindrical cavity wall 759 surrounding its resonant cavity 753, the actual cavity wall being formed by mounting portions spaced apart between the individual resonant silencing devices 210.

[0064] like Figure 7A and Figure 7BAs shown, the resonant cavity 753 is cylindrical. The mounting portion 340 has a front wall 758 and a rear wall 763, and the resonant cavity 753 of the resonant silencing device 210 is disposed between the front wall 758 and the rear wall 763. In this embodiment, the first connecting channel 755 is formed by a tube extending from the front wall 758 into the interior of the resonant cavity 753 and extending for a certain length, and a first opening 552 is formed on the front wall 758. Thus, when the first opening 552 is open, the first connecting channel 755 can fluidly connect the resonant cavity 753 and the corresponding compression cavity 225. In this embodiment, the first connecting channel 755 is disposed at the bottom of the cavity wall 759. The extending direction of the first connecting channel 755 is approximately aligned with the axial direction of the resonant cavity 753. Those skilled in the art will understand that, for ease of description, the first connecting channel 755 in this embodiment is disposed at the bottom of the resonant silencing device 210; in other embodiments, the first connecting channel 755 may also be disposed in other directions.

[0065] In this embodiment, a first connecting channel 755 is defined by a tube 757. The bottom of the tube 757 and a cavity wall 759 are integrally formed in the extending direction of the first connecting channel 755. The first connecting channel 755 has a first end 764 and a second end 765, the first end 764 being located in the resonant cavity 753, and the second end 765 forming a first opening 552. The bottom of the first connecting channel 755 is not higher than the cavity wall 759 at least at the first end 764, so that liquid in the resonant cavity 753 can enter the first connecting channel 755. Furthermore, the bottom of the first connecting channel 755 is not higher than the first end 764 at least at the second end 765, so that liquid in the first connecting channel 755 can be discharged from the second end 765 into a corresponding compression cavity 225. In some embodiments, the inner surface of the bottom of the cavity wall 759 extends continuously from the first end 764 to the second end 765 of the first connecting channel 755.

[0066] In some embodiments, at the first end 764 of the first connecting channel 755, the inner surface of the bottom of the cavity wall 759 is slightly higher than the inner surface of the bottom of the first connecting channel 755. In some embodiments, the inner surface of the bottom of the first connecting channel 755 may not extend axially, but rather extend obliquely downwards from the first end 764 to the second end 765. That is, in the extending direction of the first connecting channel 755, the inner surfaces of the bottom of the cavity wall 759, the first end 764, and the second end 765 are generally flush or gradually descending, so that the liquid in the resonant cavity 753 can flow out smoothly without accumulating in the resonant cavity 753. As a specific embodiment, the inner surface of the bottom of the first connecting channel 755 is tangential to the inner surface of the cavity wall 759.

[0067] In this embodiment, the resonant cavity 753 and the first connecting channel 755 together form a resonant silencing device 210. By setting the volume of the resonant cavity 753, the length of the first connecting channel 755, and the inner diameter of the first connecting channel 755, each resonant silencing device 210 can have a predetermined natural frequency, and several resonant silencing devices 210 can have different predetermined natural frequencies.

[0068] In this embodiment, the first connecting channel 755 is used not only to receive sound waves but also to drain liquid. Specifically, sound waves can excite the gas in the resonant cavity from the compression cavity 225 through the first opening 552 to generate resonance, thereby silencing the sound. Even if liquid from the compression cavity 225 enters the resonant cavity 753, because the resonant cavity 753 and the compression cavity 225 can have a pressure difference at certain moments during rotor rotation, the liquid entering the resonant cavity 753 can be discharged from the resonant cavity 753 in a timely manner. In this way, the resonant silencing device 210 can be prevented from being affected by the liquid in the resonant cavity 753 and thus from failing to reach the predetermined natural frequency as expected, thereby ensuring the silencing effect of the resonant silencing device 210.

[0069] To further reduce the pressure impact on the cavity structure of the resonant cavity 753 caused by pressure pulsation of the compressed gas and to reduce the pressure loss of the compressed gas, the inner surface of the front wall 758 is also set to a partially spherical shape in this embodiment. Furthermore, the inner surface of the rear wall 763 is set to a smooth curved surface. Those skilled in the art will understand that when the mounting part is made of a higher strength material, the inner surfaces of the front wall 758 and the rear wall 763 can also be set to a planar or other shape.

[0070] The resonance silencing device 210 of this application, by setting the position and shape of the first connecting channel 755, the front wall 758 and the rear wall 763, can effectively avoid the influence of high-pressure compressed gas in the compression cavity on the resonance silencing device 210, and timely discharge the liquid in the resonance cavity 753. It is suitable for working in a high-pressure environment where liquid is present, and therefore can be installed on the inner wall of the rotor cavity of a screw compressor.

[0071] Those skilled in the art will understand that the terms "above", "below", "top", "bottom", "high", and "low" mentioned above are relative to the orientation shown in the figure and do not represent the orientation of the resonance silencing device in the screw compressor.

[0072] Figure 8A and Figure 8B The specific structure of another embodiment of the resonant silencing device 810 is shown. Figure 8A This is a three-dimensional perspective schematic diagram of the resonance silencing device 810. Figure 8B for Figure 8A An axial sectional view passing through the center of the first opening 852. (See image.) Figure 8A and Figure 8B As shown, the structure of the resonant silencing device 810 is roughly the same as that of the resonant silencing device 210, except that the shapes of the first connecting channel 855 and the resonant cavity 853 are different from those of the resonant silencing device 210. Specifically, in this embodiment, the resonant cavity 853 is spherical, with the front wall 858, cavity wall 859, and rear wall 863 arranged around the spherical resonant cavity 853. The spherical resonant cavity 853 can further reduce the impact of high-pressure compressed gas and facilitate liquid discharge. The first connecting channel 855 is a fan-shaped structure with a gently sloping bottom to increase the volume of liquid that can be discharged.

[0073] Figure 9 A partial unfolded view of another embodiment of the rotor cavity inner wall 218 provided with the resonance silencing device 910 is shown, illustrating the arrangement of the resonance silencing device 910. (See attached image.) Figure 9 As shown, the structure of the resonant silencing device 910 is roughly the same as that of the resonant silencing device 210, the difference being that the resonant silencing device 910 includes a resonant cavity 1153 and two connecting channels (see...). Figure 11B As shown, the two connecting channels are the first connecting channel 1155 and the second connecting channel 1154. The first connecting channel 1155 forms a first opening 952 on the inner wall 218 of the rotor cavity, and the second connecting channel 1154 forms a second opening 951 on the inner wall 218 of the rotor cavity. The first connecting channel 1155, the first opening 952, the second connecting channel 1154, and the second opening 951 are all in fluid communication with the resonant cavity 1153. Furthermore, as the pair of rotors 221 and 222 rotate, they can also be in fluid communication with the compression cavity 225, so that liquids such as lubricating oil mixed in the gas in the compression cavity 225 can enter or exit the resonant cavity 753. For example, as a pair of rotors 221 and 222 rotate, the resonant cavity 1153 first connects to the high-pressure compression cavity 225 through the second connecting channel 1154 and the second opening 951, and then connects to the low-pressure compression cavity 225 through the first connecting channel 1155 and the first opening 952, so as to discharge the fluid in the resonant cavity 1153 in real time.

[0074] In this embodiment, the first opening 952 and the second opening 951 need to be configured in a certain way to ensure the normal operation of the screw compressor 100. The first opening 952 and the second opening 951 of the resonant silencing device 210 will not be in fluid communication with both compression cavities 225 simultaneously. This is because if the first opening 952 and the second opening 951 of the resonant silencing device 210 are in fluid communication with both compression cavities 225 simultaneously, the pressure difference in each compression cavity 225 will cause the screw compressor 100 to degrade in performance or even fail to compress.

[0075] Specifically, each resonant muffler 210 is configured such that its first opening 952 and second opening 951 are located on the inner wall 218 of the rotor cavity within the range of the tooth tip 234 of the rotor teeth 232 of the female rotor 222, so that the first opening 952 and second opening 951 of each resonant muffler 210 cannot simultaneously be in fluid communication with two different compression cavities 225. During the operation of the screw compressor 100, the volumes of the two different compression cavities 225 are different, and therefore the gas pressures in the different compression cavities 225 are also different. If the first opening 952 and second opening 951 of the resonant muffler 210 are simultaneously in fluid communication with two different compression cavities 225, it will cause the screw compressor 100 to fail to compress. As an example, the distance D2 between the outer edges of the first opening 952 and second opening 951 of each resonant muffler 210 in the width direction of the rotor teeth 232 is less than the width D1 of the tooth tip 234.

[0076] Thus, as the pair of rotors rotate, the rotor teeth 232 of the female rotor 222 move along the axial direction, and the first opening 952 and the second opening 951 of each resonance silencing device 210 can be in fluid communication with a compression cavity 225 at the same time, or be closed by the tooth tip 234 at the same time, or one of them is in fluid communication with the compression cavity 225 and the other is closed by the tooth tip 234.

[0077] Furthermore, in some embodiments, the center line connecting the first opening 952 and the second opening 951 of the resonant silencing device 210 is not parallel to the extension direction of the corresponding rotor teeth, so that as the rotor rotates, the tooth tip 234 can sequentially close the first opening 952 and the second opening 951, thereby extending the communication time between the resonant cavity 1153 and the high-pressure first compression cavity 661, so that the resonant cavity 1153 and the low-pressure second compression cavity 662 can have a larger pressure difference, which is more conducive to the automatic discharge of liquid from the resonant cavity 1153 to the low-pressure second compression cavity 662.

[0078] As an example, the tooth tip 234 of the rotor teeth 232 of the female rotor 222 has a centerline parallel to the extending direction of the rotor teeth 232, and the first opening 952 and the second opening 951 are located on both sides of the centerline, respectively. In other embodiments, the center line connecting the first opening 952 and the second opening 951 of the resonant silencing device 210 may also be parallel to the extending direction of the corresponding rotor teeth, and the first opening 952 and the second opening 951 may be configured with outer contours of different dimensions, so that during rotor rotation, at least at certain times, one of the first opening 952 and the second opening 951 is closed by the tooth tip 234, while the other can be in fluid communication with the compression cavity. Those skilled in the art will understand that in this embodiment, the first opening 952 and the second opening 951 are configured as circular for ease of description, but in other embodiments, the first opening 952 and the second opening 951 may also be of other shapes.

[0079] Figures 10A-10E The diagram illustrates the positional relationship between the resonance silencing device 910 and the tooth tip 234 during the rotation of a pair of rotors. Figures 10A-10E As shown, with the rotation of a pair of rotors, the compression chamber 225 moves axially in the direction indicated by arrow 660. The helical rotor teeth 232 also move axially relative to the inner wall 218 of the rotor chamber in the direction indicated by arrow 660. The area above the tooth tip 234 is the high-pressure side, and the area below the tooth tip 234 is the low-pressure side. In this embodiment, as described above, two compression chambers 225 are formed on the upper and lower sides of the tooth tip 234, respectively. These two compression chambers 225 include a first compression chamber 661 and a second compression chamber 662. The first compression chamber 661 is located above the tooth tip 234, and the second compression chamber 662 is located below the tooth tip 234. The gas pressure in the first compression chamber 661 is greater than the gas pressure in the second compression chamber 662. That is, the first compression chamber 661 is a high-pressure compression chamber, and the second compression chamber 662 is a low-pressure compression chamber. It should be noted that high pressure and low pressure here are relative to each other. For ease of display, Figures 10A-10E Only a portion of the tooth tip 234 of rotor tooth 232 is shown in the figure.

[0080] like Figure 10AAs shown, the resonant silencing device 910 is entirely located in the first compression cavity 661 above the tooth tip 234 of the rotor tooth 232. Both the first opening 952 and the second opening 951 of the resonant silencing device 910 are in fluid communication with the first compression cavity 661. At this time, the resonant silencing device 910 absorbs and attenuates the pressure pulsation energy in the first compression cavity 661 by resonating with sound waves of certain frequencies in the first compression cavity 661. At this time, both the first opening 952 and the second opening 951 of the resonant silencing device have the same pressure as in the first compression cavity 661. As the pair of rotors rotate, the pressure in the first compression cavity 661 continuously increases, and fluids such as lubricating oil in the cavity 661 flow into the resonant cavity 1153. With further rotation of the screw rotor, the tooth tip 234 of the rotor tooth 232 moves relative to the resonant silencing device 910 in the direction of arrow 660, and the tooth tip 234 and the resonant silencing device 910 reach... Figure 10B The location shown.

[0081] like Figure 10B As shown, a portion of the resonant muffler 910 is located within the area of ​​the tooth tip 234, while the other portion remains within the first compression cavity 661. The second opening 951 of the resonant muffler 910 remains in fluid communication with the first compression cavity 661, and the first opening 952 of the resonant muffler 910 is closed by the tooth tip 234. At this time, the second opening 951 of the resonant cavity 1153 has the same high pressure as the first compression cavity 661. The first opening 952 is closed by the tooth tip 234, and as the rotor rotates, the pressure in the first compression cavity 661 continues to rise. Therefore, fluids such as lubricating oil in the first compression cavity 661 can continue to flow into the resonant cavity 1153 through the second opening 951, further increasing the fluid pressure in the resonant cavity 1153. As the pair of rotors continue to rotate, the tooth tip 234 continues to move relative to the resonant muffler 910 in the direction of arrow 660, and the tooth tip 234 and the resonant muffler 910 reach... Figure 10C The location shown.

[0082] like Figure 10C As shown, the resonant muffler 910 is entirely located within the area of ​​the tooth tip 234. Both the first opening 952 and the second opening 951 of the resonant muffler 910 are closed by the tooth tip 234. At this time, the resonant muffler 910 is not in fluid communication with any compression cavity 225. As the pair of rotors continue to rotate, the tooth tip 234 continues to move relative to the resonant muffler 910 in the direction of arrow 660, and the tooth tip 234 and the resonant muffler 910 reach... Figure 10D The location shown.

[0083] like Figure 10DAs shown, a portion of the resonant muffler 910 remains within the area of ​​the tooth tip 234, while another portion is located in the second compression cavity 662 below the tooth tip 234. The second opening 951 of the resonant muffler 910 is closed by the tooth tip 234, and the first opening 952 of the resonant muffler 910 is in fluid communication with the second compression cavity 662. At this time, the second opening 951 of the resonant muffler has the same high pressure as when it is disconnected from the first compression cavity 661, and the first opening 952 has the same low pressure as in the second compression cavity 662. Therefore, a pressure difference is formed between the resonant cavity 1153 and the second compression cavity 662, which causes the fluid in the resonant cavity 1153 to be automatically discharged into the second compression cavity 662 the instant the first opening 952 connects with the second compression cavity 662. Furthermore, at this time, due to the pressure change acting on the inner wall of the cavity at the resonant silencing device 910, the resonant silencing device 910 can absorb and attenuate the pressure pulsation energy acting on the inner wall of the cavity at the resonant silencing device 910 by resonating with sound waves of certain frequencies. As the pair of rotors continue to rotate, the tooth tip 234 continues to move relative to the resonant silencing device 910 in the direction of arrow 660, and the tooth tip 234 and the resonant silencing device 910 reach... Figure 10E The location shown.

[0084] like Figure 10E As shown, the resonant silencing device 910 is entirely located within the second compression cavity 662. Both the first opening 952 and the second opening 951 of the resonant silencing device 910 are in fluid communication with the second compression cavity 662. At this time, both the first opening 952 and the second opening 951 of the resonant silencing device 910 have the same pressure as in the second compression cavity 662. The resonant silencing device 910 absorbs and attenuates the pressure pulsation energy in the second compression cavity 662 by resonating with the sound waves in the second compression cavity 662. As the pair of rotors continue to rotate, the tip of the next rotor tooth (not shown in the figure) moves relative to the resonant silencing device 910 in the direction of arrow 660. For the tip of the next rotor tooth, the tip and the resonant silencing device 910 are again in the same position. Figure 10A The position is shown. Therefore, the tips of the rotor teeth circulate relative to the resonance silencing device 910. The resonance silencing device 910 sequentially absorbs and attenuates the pressure pulsation energy in each compression cavity and at the cavity wall through resonance, and promptly discharges lubricating oil and other fluids that have entered the resonance cavities of each resonance silencing device 910.

[0085] Those skilled in the art will understand that, compared to a resonant silencing device 210 with only one connecting channel, this embodiment offers advantages in terms of... Figure 10B In the state shown, the resonant cavity 1153 can still be fluidly connected to the first compression cavity 661 through the second opening 951. As the rotor rotates, the first compression cavity 661... Figure 10BIn the state shown, the pressure continues to rise. Therefore, under the same conditions, in situations like... Figure 10C The pressure in the resonant cavity 1153 in the state shown will be greater than that in Figure 6B The pressure in the resonant cavity 753 is shown in the diagram. Therefore, when the resonant silencing device 910 discharges the fluid in the resonant cavity 1153 into the second compression cavity 662, a greater pressure difference can be achieved between the resonant cavity 1153 and the second compression cavity 662, allowing the fluid in the resonant cavity 1153 to be discharged more thoroughly.

[0086] Figure 11A and Figure 11B The specific structure of one embodiment of the resonant silencing device 910 is shown. Figure 11A This is a three-dimensional perspective schematic diagram of the resonance silencing device 910. Figure 11B for Figure 11A An axial cross-sectional view passing through the center of the first opening 952 and the center of the second opening 951. To more clearly illustrate the specific structure of the resonance silencing device 910. Figure 11A The resonant silencing device 910 in the diagram schematically shows a cylindrical cavity wall surrounding its resonant cavity 1153, while the actual cavity wall is formed by mounting portions spaced apart between the individual resonant silencing devices 910.

[0087] like Figure 11A and Figure 11B As shown, the resonant silencing device 910 has a similar structure to the resonant silencing device 210, and the similar parts will not be described again. The difference is that the resonant silencing device 910 also includes a second connecting channel 1154 and a second opening 951. The second connecting channel 1154 is disposed above the first connecting channel 1155, and the second connecting channel 1154 is formed by a through hole extending through the front wall 1158. The second connecting channel 1154 forms a second opening 951 on the front wall 1158. In this embodiment, the first connecting channel 1155 is disposed at the bottom of the cavity wall 1159, and the second connecting channel 1154 is disposed at the top of the cavity wall 1159. The extending directions of the first connecting channel 1155 and the second connecting channel 1154 are approximately parallel, and both are aligned with the axial direction of the resonant cavity 1153. Those skilled in the art will understand that in this embodiment, the first connecting channel 1155 and the second connecting channel 1154 are arranged approximately symmetrically at the top and bottom of the resonant silencing device 210. In other embodiments, the first connecting channel 1155 and the second connecting channel 1154 may also be arranged in other positions.

[0088] In this embodiment, the resonant cavity 1153, the first connecting channel 1155, and the second connecting channel 1154 together form a resonant silencing device 910. With the inner diameter of the second connecting channel 1154 fixed, by setting the volume of the resonant cavity 1153, the length of the first connecting channel 1155, and the inner diameter of the first connecting channel 1155, each resonant silencing device 910 can have a predetermined natural frequency, and multiple resonant silencing devices 910 can have different predetermined natural frequencies. As an example, the liquid in the resonant cavity 1153 is mainly discharged through the first connecting channel 1155; therefore, the inner diameter of the first connecting channel 1155 can be set to be larger than the inner diameter of the second connecting channel 1154.

[0089] In this embodiment, the first opening 952, the first connecting channel 1155, and the second opening 951 and the second connecting channel 1154 are used not only to receive sound waves but also to drain liquid. This prevents the resonant silencing device 910 from being affected by the liquid in the resonant cavity 1153, thus ensuring the silencing effect of the resonant silencing device 910.

[0090] Those skilled in the art will understand that the terms "above", "below", "top", "bottom", "high", and "low" mentioned above are relative to the orientation shown in the figure and do not represent the orientation of the resonance silencing device in the screw compressor.

[0091] Figure 12A and Figure 12B The specific structure of another embodiment of the resonant silencing device 1210 is shown. Figure 12A This is a three-dimensional perspective schematic diagram of the resonance silencing device 1210. Figure 12B for Figure 12A An axial cross-sectional view passing through the center of the first opening 1252 and the center of the second opening 1251. (See figure) Figure 12A and Figure 12BAs shown, the structure of the resonant silencing device 1210 is roughly the same as that of the resonant silencing device 910, the difference being the shape of the second connecting channel 1254. Specifically, in this embodiment, the second connecting channel 1254 is similar to the first connecting channel 1255. The second connecting channel 1254 is also formed by a tube extending from the front wall 1258 into the resonant cavity 1253 and extending for a certain length, and a second opening 1251 is formed on the front wall 1258. That is, in this embodiment, both the second connecting channel 1254 and the first connecting channel 1255 are formed by tubes extending inward from the front wall 1258. As an example, the top of the second connecting channel 1254 is tangential to the inner surface of the cavity wall 1259. By setting both the second connecting channel 1254 and the first connecting channel 1255 to be tangent to the inner surface of the cavity wall 1259, it is not only easier to discharge the liquid in the resonant cavity 1253, but also to maximize the distance between the second connecting channel 1254 and the first connecting channel 1255, which is particularly suitable for resonant silencing devices with a small resonant cavity 1253.

[0092] In existing screw compressors, the rotation of a pair of rotors compresses the gas in each compression chamber, and the increased pressure of the gas generates noise energy. Furthermore, the compression process induces pressure fluctuations on the inner walls of the rotor chambers, resulting in pressure pulsations with high acoustic energy. This causes a dynamic response in the rotor housing, ultimately leading to vibration and noise in the screw compressor.

[0093] In the screw compressor of this application, the resonance silencing device is installed on the inner wall of the rotor cavity, thus enabling more rapid and efficient elimination of noise directly at the locations of highest gas pressure and pressure pulsation. Furthermore, by configuring the positions of the connecting channels and openings, the resonance silencing device of this application ensures that it does not affect the operation of the screw compressor.

[0094] Furthermore, the resonant silencing device of this application can effectively avoid the influence of high-pressure compressed gas in the compression cavity on the resonant silencing device by setting the position and shape of each connecting channel, front wall and rear wall, and prevent the structure of the resonant silencing device from being damaged by pressure pulses. At the same time, the liquid in the resonant cavity can be discharged in real time to ensure the stability of the silencing effect of the resonant silencing device. Therefore, the resonant silencing device can be set on the inner wall of the rotor cavity corresponding to the rotor cavity with very high pressure pulsation energy.

[0095] Furthermore, the resonant silencing device of this application has an acoustic superstructure that reduces the energy of the pressure pulse by resonating with sound waves of certain frequencies in the noise, thereby achieving the purpose of noise reduction. Not only does each resonant silencing device have a good silencing effect and occupy little space, but multiple resonant silencing devices with different predetermined natural frequencies can also eliminate noise in the compression cavity over a wide frequency range.

[0096] Although this disclosure has been described in conjunction with examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or now or soon to be foreseen, will likely be apparent to those skilled in the art. Therefore, the examples of embodiments of this disclosure set forth above are intended to be illustrative rather than restrictive. Various changes can be made without departing from the spirit or scope of this disclosure. Therefore, this disclosure is intended to include all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents. The technical effects and problems described in this specification are exemplary rather than restrictive. It should be noted that the embodiments described in this specification may have other technical effects and may solve other technical problems.

Claims

1. A screw compressor, characterized in that... include: A housing, the housing including a rotor housing having a rotor cavity and an inner wall defining the rotor cavity; A pair of rotors are disposed within a rotor cavity, each rotor having rotor teeth. A compression cavity is formed between the rotor teeth and the inner wall of the rotor cavity. The pair of rotors have a rotor intake inlet and a rotor exhaust outlet. The pair of rotors are configured such that, with rotation of the rotors, the compression cavity periodically undergoes a volume change, allowing gas in the compression cavity to move from the rotor intake inlet, where its pressure is increased, to the rotor exhaust outlet. A plurality of resonant silencing devices are disposed on the inner wall of the rotor cavity. Each of the resonant silencing devices is configured to have a predetermined natural frequency to absorb and attenuate pressure pulsation energy by resonating with a sound wave having the predetermined natural frequency, thereby reducing noise. The resonant silencing device includes a resonant cavity and at least one communicating channel, the at least one communicating channel being in fluid communication with the resonant cavity. Each of the resonant silencing devices is configured such that as the pair of rotors rotate, there is a pressure difference between the resonant cavity and the compression cavity outside the resonant silencing device, and the at least one connecting channel is capable of fluidly connecting the resonant cavity and the compression cavity outside the resonant silencing device, so that liquid in the compression cavity can enter the resonant cavity or exit the resonant cavity through the at least one connecting channel.

2. The screw compressor according to claim 1, characterized in that: The resonant silencing device is an acoustic superstructure, wherein at least a portion of the resonant silencing device is configured to have different predetermined intrinsic frequencies.

3. The screw compressor according to claim 1, characterized in that: In the extending direction of the at least one connecting channel, the bottom of the at least one connecting channel is not higher than one end in the resonant cavity at least at the end in the compression cavity, so that the liquid in the resonant cavity can be discharged into the compression cavity through the at least one connecting channel.

4. The screw compressor according to claim 3, characterized in that: The inner wall of the rotor cavity includes a front wall and a cavity wall, and the cavity wall is arranged around the resonant cavity; The bottom of the at least one communicating channel is not higher than the cavity wall at one end in the resonant cavity, so that the liquid in the resonant cavity can enter the at least one communicating channel.

5. The screw compressor according to claim 4, characterized in that: The inner surface of the bottom of the at least one communicating channel is tangential to the inner surface of the cavity wall.

6. The screw compressor according to claim 5, characterized in that: The inner wall of the rotor cavity also includes a rear wall, which is disposed opposite to the inner surface of the front wall. The inner surface of the front wall of the rotor cavity is a partially spherical surface, and the inner surface of the rear wall is a smooth curved surface.

7. The screw compressor according to claim 6, characterized in that: The inner surface of the cavity wall of the resonant cavity is spherical.

8. The screw compressor according to claim 4, characterized in that: The at least one communication channel includes a first communication channel and a second communication channel. The resonant silencing device is configured such that, as the pair of rotors rotate, the resonant cavity is first fluidly connected to a high-pressure compression cavity through the second communication channel, and then fluidly connected to a low-pressure compression cavity through the first communication channel, so as to discharge the liquid in the resonant cavity.

9. The screw compressor according to claim 8, characterized in that: The rotor teeth of the pair of rotors have tooth tips; The first connecting channel and the second connecting channel respectively form a first opening and a second opening on the front wall; The first opening and the second opening of each of the resonant silencing devices are configured to be located within the tooth tip range of the rotor teeth of the pair of rotors, such that the first opening and the second opening of each of the resonant silencing devices cannot be in fluid communication with two compression cavities simultaneously.

10. The screw compressor according to claim 9, characterized in that: The distance D2 between the outer edges of the first and second openings of each of the resonant silencing devices, in the width direction of the rotor teeth, is less than the width D1 of the tooth tip of the corresponding rotor.

11. The screw compressor according to claim 9, characterized in that: The line connecting the centers of the first and second openings of each of the resonant silencing devices is not parallel to the extension direction of the rotor teeth.

12. The screw compressor according to claim 11, characterized in that: The tooth tips of each pair of rotors have a centerline parallel to the extension direction of the rotor teeth, and the first opening and the second opening of each resonance silencing device are located on both sides of the centerline.

13. The screw compressor according to claim 8, characterized in that: The inner diameter of the first connecting channel is not less than that of the second connecting channel.

14. The screw compressor according to claim 1, characterized in that: Each of the resonant silencing devices is configured to form the predetermined natural frequency through the volume of the resonant cavity, the length of the connecting channel, and the inner diameter of the connecting channel.

15. The screw compressor according to claim 1, characterized in that: The pair of rotors includes a male rotor and a female rotor, the rotor teeth include male rotor teeth and female rotor teeth, the male rotor teeth and the female rotor teeth mesh with each other, the rotor cavity includes a male rotor cavity and a female rotor cavity, the male rotor is disposed in the male rotor cavity, and the female rotor is disposed in the female rotor cavity; The resonance silencing device is disposed on the inner wall of the rotor cavity that defines the female rotor cavity.

16. The screw compressor according to any one of claims 1-15, characterized in that: The rotor housing includes an interconnected body and a mounting plate, the mounting plate forming at least a portion of the inner wall of the rotor cavity, and the plurality of resonance silencing devices disposed on the mounting plate, wherein the mounting plate and the plurality of resonance silencing devices are formed by 3D printing, casting or CNC machining.

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