Screw compressor

Abstract

The screw compressor comprises a housing (101), a pair of rotors (221), an exhaust channel (218), and a silencing device (220). The silencing device (220) is located within the exhaust channel (218) and comprises at least one mounting seat (219) and a plurality of silencing units (210). The silencing device (220) is configured such that compressed gas entering the exhaust channel (218) from the rotor housing cavity (213) flows through the side walls (234) of the mounting seat (219) and the silencing units (210), and is then discharged from the exhaust port (106). Furthermore, the silencing device (220) can balance the gas pressure loss caused by the silencing device by increasing the flow area of ​​the silencing channel without affecting the exhaust pressure of the screw compressor.

Description

Technical Field

[0001] This application relates to the field of compressors, particularly screw compressors.

Background Art

[0002] A screw compressor includes a pair of rotors and changes the basic element volume formed by the tooth-shaped space to complete the processes of gas inhalation, compression, and exhaust by utilizing the meshing of the tooth grooves of the pair of rotors. Since the screw compressor forms discontinuous inter-tooth volumes by the meshing of the rotors, the suction cavity and the exhaust cavity communicate with the working cavity periodically, resulting in unstable gas flow, causing pressure pulsations during the suction and exhaust processes, and thus causing vibrations and noises of the compressor.

Summary of the Invention

[0003] This application provides a screw compressor comprising a housing, a pair of rotors, an exhaust channel, and a silencer. The housing comprises a rotor housing and an exhaust housing, the rotor housing defining a rotor housing cavity, and the exhaust housing defining an exhaust housing cavity, the rotor housing cavity and the exhaust housing cavity being in fluid communication, and an exhaust port located on the exhaust housing. A pair of rotors are arranged within the rotor housing cavity, and a compression housing cavity can be formed between the teeth of the pair of rotors and the housing, the rotor housing cavity having an intake end and an exhaust end, and the pair of rotors are arranged such that as the pair of rotors rotate, the gas entering the compression housing cavity is compressed from the intake end and then moves to the exhaust end. An exhaust channel is located within the exhaust housing, and the exhaust channel forms fluid communication between the exhaust end and the exhaust port, and the exhaust channel is configured to discharge the compressed gas in the rotor housing cavity from the exhaust port. The silencing device is positioned within the exhaust channel and comprises at least one mounting sheet and a plurality of silencing units, the mounting sheet having side walls extending along the direction of extension of the exhaust channel, and the plurality of silencing units positioned on the side walls of at least one mounting sheet. The silencing device is configured such that compressed gas entering the exhaust channel from the rotor housing cavity flows through the side walls of the mounting sheet and the silencing units and is then discharged from the exhaust port.

[0004] According to the above, the exhaust channel is equipped with a silencing channel, and the silencing device is placed within the silencing channel. The number of at least one mounting sheet and the flow area of ​​the silencing channel are configured such that the compressed gas discharged from the exhaust port reaches a predetermined pressure.

[0005] According to the above, the radial cross-section of the sound-dampening channel is rectangular.

[0006] According to the above, the sound-dampening device is formed by a 3D printing process or a numerically controlled machining process.

[0007] According to the above, the sound silencing device comprises a limiting structure positioned on the housing cavity wall defining a sound silencing channel, and a limiting alignment structure positioned on a mounting sheet, wherein the limiting structure is aligned with the limiting alignment structure so as to connect the mounting sheet to the housing cavity wall.

[0008] According to the above, the limiting structure comprises a groove located on the wall of the housing cavity, and the limiting alignment structure comprises a mounting portion located on the mounting sheet, the mounting portion being able to be inserted and fitted into the groove.

[0009] According to the above, the mounting sheet is formed integrally with the housing cavity wall that defines the sound-absorbing channel.

[0010] According to the above, the multiple sound-dampening units comprise multiple resonant sound-dampening units, each of which is configured to have a predetermined natural frequency in order to reduce noise in the exhaust channel by resonating with sound waves having a predetermined natural frequency in the noise.

[0011] According to the above, the resonant sound-dampening unit is an acoustic superstructure, and at least a portion of the resonant sound-dampening unit is configured to have different predetermined natural frequencies.

[0012] According to the above description, the side wall of the mounting sheet has a wall, and each resonant sound-dampening unit comprises a resonant cavity and a connecting pipe, the connecting pipe extending from the side wall into the interior of the resonant cavity and forming a fluid communication between the resonant cavity and the exhaust channel.

[0013] According to the above, the inner surface of the wall is partially spherical.

[0014] According to the above, each resonant sound-dampening unit further comprises a pressure-equalizing channel, which extends through the wall to form a fluid communication between the resonant cavity and the exhaust channel.

[0015] According to the above, each resonant sound-dampening unit is configured to form a predetermined natural frequency based on the volume of the resonant cavity, as well as the length and inner diameter of the connecting tube and pressure balancing channel.

[0016] According to the above, the screw compressor further comprises an additional silencing device, the additional silencing device being located on the containment cavity wall defining the exhaust channel, and the additional silencing device comprising the silencing unit described above.

[0017] Other features, advantages, and embodiments of this application may be described or become apparent by considering the following detailed description, accompanying drawings, and claims. Furthermore, it should be understood that the above summary of the invention and the following specific embodiments are all illustrative and are intended to provide further explanation rather than limit the claimed scope of this application. However, the detailed description and specific embodiments only illustrate 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 from this detailed description. [Brief explanation of the drawing]

[0018] [Figure 1A] This is a three-dimensional structural diagram of a screw compressor according to an embodiment of this application. [Figure 1B] Figure 1A is a three-dimensional structural diagram of the screw compressor from a different viewpoint. [Figure 2] This is a cross-sectional view of the screw compressor shown in Figure 1A, along line AA. [Figure 3] Figure 1A is a localized exploded view of the exhaust housing. [Figure 4A] This is a three-dimensional structural diagram of the exhaust housing in a screw compressor according to another embodiment of this application. [Figure 4B] Figure 4A is a three-dimensional structural diagram of the exhaust housing from a different viewpoint. [Figure 4C] This is a cross-sectional view of the exhaust housing along line BB shown in Figure 4A. [Figure 4D]It is a cross-sectional view taken along line C-C of the exhaust housing shown in FIG. 4A. [Figure 5A] It is a schematic diagram of a local structure of an embodiment of the silencing device in FIG. 3. [Figure 5B] It is a schematic diagram of a local structure of another embodiment of the silencing device in FIG. 3. [Figure 6A] It is a schematic diagram of the structure of the resonance silencing unit in FIG. 5A. [Figure 6B] It is an axial cross-sectional view of the resonance silencing unit shown in FIG. 6A. [Figure 7] It is a three-dimensional structure diagram of another embodiment of the silencing device in FIG. 4A. [Figure 8] It is a three-dimensional structure diagram of yet another embodiment of the silencing device in FIG. 4A. [Figure 9] It is a three-dimensional structure diagram of yet another embodiment of the silencing device in FIG. 4A. [Figure 10] It is a three-dimensional structure diagram of yet another embodiment of the silencing device in FIG. 4A. [Figure 11A] It is a three-dimensional structure diagram of the exhaust housing in a screw compressor according to yet another embodiment of the present application. [Figure 11B] It is a three-dimensional structure diagram of the exhaust housing from another perspective shown in FIG. 11A.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, various specific embodiments of the present application will be described while referring to the accompanying drawings that form part of the specification. For the purpose of explaining various exemplary structural parts and elements of the present application, terms representing directions such as "front", "rear", "upper", "lower", "left", "right", "top", and "bottom" are used. However, it should be understood that these terms used in this specification are determined based on the exemplary orientations shown in the accompanying drawings only for the purpose of facilitating the illustration. Since the embodiments disclosed in the present application can be arranged in different directions, these terms representing directions are for illustrative purposes only and should not be regarded as limiting.

[0020] Figures 1A and 1B show three-dimensional structural diagrams of a screw compressor 100 to illustrate the external structure of the screw compressor 100 according to an embodiment of the present application. Figure 1A shows a three-dimensional structural diagram viewed from the front to the rear, and Figure 1B shows a three-dimensional structural diagram viewed from the rear to the front. As shown in Figures 1A and 1B, the screw compressor 100 comprises a housing 101. The housing 101 is generally cylindrical in shape and comprises a motor housing 102, a rotor housing 103, and an exhaust housing 104 connected in order along its length. The motor housing 102 has an intake port 105 and is mainly used to house a motor 212 (shown in Figure 2). The rotor housing 103 has a rotor housing cavity 213 (shown in Figure 2) inside and is used to house a pair of rotating rotors 221 therein. The exhaust housing 104 has an exhaust port 106 and is used to discharge compressed gas. In this embodiment, the intake port 105 and the exhaust port 106 are located on both ends of the housing 101 in the longitudinal direction. Therefore, after the gas enters the housing 101 through the intake port 105, it flows almost along its length, is compressed, and then is discharged out of the housing 101 through the exhaust port 106.

[0021] Figure 2 shows a cross-sectional view along line AA of the screw compressor 100 shown in Figure 1A to illustrate the internal structure of the screw compressor 100. As shown in Figure 2, a pair of rotors 221, arranged substantially parallel and side by side, are housed in a rotor housing cavity 213. The pair of rotors 221 comprises a male rotor and a female rotor. Those skilled in the art will understand that, as shown in the figure, only the male rotor is shown in the cut position. The male and female rotors mesh with each other, and the male rotor is connected to a motor 212, which can then drive the pair of rotors 221 to rotate each other. The pair of rotors 221 have axes parallel to each other, and the male and female rotors rotate around their respective axes. In this embodiment, the pair of rotors 221 are rotatable around their axial direction, with the direction of extension of the axes being the axial direction.

[0022] The male and female rotors are each provided with multiple helical teeth, and grooves are formed at intervals between adjacent teeth. The male and female rotors, through their teeth and corresponding grooves, form an interlocking structure and, together with the rotor housing 103, form multiple spaced-apart compression housing cavities 225. The rotor housing cavity 213 has an intake end 223 located at the left end and an exhaust end 224 located at the right end. As gas is drawn into the compression housing cavity 225 from the intake end 223 and the pair of rotors rotate, the compression housing cavity 225 gradually moves toward the exhaust end 224. At the same time, the volume of the compression housing cavity 225 gradually decreases with the rotation of the pair of rotors, and the gas inside the compression housing cavity 225 is gradually compressed. The compressed gas is discharged from the exhaust end 224.

[0023] The exhaust housing 104 defines an exhaust containment cavity 214, which includes an exhaust channel 218 for fluid communication between the exhaust end 224 of the rotor containment cavity 213 and the exhaust port 106. The exhaust channel 218 allows compressed gas discharged from the exhaust end 224 to pass through the exhaust channel 218 and then be discharged to the outside of the screw compressor 100 through the exhaust port 106.

[0024] When the screw compressor 100 is operated, the meshing of the pair of rotors 221 forms a discontinuous compression containment cavity 225, resulting in the intermittent discharge of compressed gas from the exhaust end 224, which then flows through the exhaust channel 218 and is discharged from the exhaust port 106, thereby generating exhaust pressure pulsations with high acoustic energy, causing vibration and noise in the screw compressor 100.

[0025] To reduce the impact of noise caused by exhaust pressure pulsations, the screw compressor 100 further comprises a silencer 220, which is located within the exhaust channel 218. In this embodiment, the silencer 220 comprises at least one mounting sheet 219 and a plurality of silencer units 210. These silencer units 210 are located on each mounting sheet 219. Thus, in the process after exhaust pressure pulsations occur, the energy of the exhaust pressure pulsations can be reduced in the process through which the compressed gas in the screw compressor 100 flows through the exhaust channel 218, thereby reducing the impact of noise caused by the exhaust pressure pulsations.

[0026] The exhaust channel 218 includes a silencing channel 217, and the containment cavity wall 216 defines the silencing channel 217. A silencing device 220 is positioned within the silencing channel 217. The silencing device 220 positioned within the silencing channel 217 reduces the flow path area for gas flow in the silencing channel 217 and increases the pressure loss as the compressed gas flows through the silencing channel 217. Mounting sheets 219 are configured to extend along the extending direction of the silencing channel 217 to reduce the pressure loss of the compressed gas. In an embodiment, the flow path area of ​​the silencing channel 217 and the number of at least one mounting sheet 219 are configured so that the pressure of the compressed gas discharged from the exhaust port 106 can reach a predetermined pressure.

[0027] Figure 3 is a local exploded view of the exhaust housing 104 of Figure 1A. As shown in Figure 3, the exhaust housing 104 comprises a mounting portion 381 and a seat body 382. The mounting portion 381 is used to connect to the rotor housing 103, and the exhaust port 106 is located on the generally cylindrical seat body 382. The exhaust housing cavity 214 comprises a housing cavity 331 for housing other components such as rotor ends, and an exhaust channel 218. The housing cavity 331 does not communicate with the exhaust channel 218, and the exhaust end 224 of the rotor housing cavity 213 can communicate only with the exhaust channel 218. In this embodiment, the exhaust channel 218 extends substantially along the axial direction of the rotor and extends from the mounting portion 381 through the seat body 382. The silencing channel 217 is a portion of the exhaust channel 218 in its extending direction (i.e., longitudinal direction), and the cross-sectional shape of the silencing channel 217 is circular. Each mounting sheet 219 of the silencing device 220 is generally rectangular and flat, and each mounting sheet 219 extends along the direction in which the exhaust channel 218 extends, and the size of these mounting sheets 219 generally matches the size of the silencing channel 217. The extent to which the mounting sheet 219 of each silencing device 220 extends in the direction of extension of the exhaust channel 218 generally defines the silencing channel 217. In some embodiments, the mounting sheet 219 of the silencing device 220 extends from the inlet to the outlet of the exhaust channel 218, so that the exhaust channel 218 generally forms the silencing channel 217 as a whole.

[0028] In this embodiment, the silencing device 220 comprises three mounting sheets 219, each mounting sheet 219 arranged parallel and spaced apart from one another within the silencing channel 217, so that the mounting sheets 219 do not obstruct the gas flow from the front, thereby reducing the pressure loss caused by mounting sheets 219 that obstruct the gas flow. In this embodiment, the mounting sheets 219 are integrally formed with the housing cavity wall 216 that defines the silencing channel 217, and can be integrally formed, for example, by 3D printing and numerically controlled machining.

[0029] Each mounting sheet 219 has a pair of side walls 334 extending along the direction of extension of the exhaust channel 218, and the silencing unit 210 is positioned on the side walls 334 of the mounting sheet 219, so that when the gas flows through the exhaust channel 218, the gas must flow through the silencing unit 210 on the side walls 334, thereby reducing the energy of exhaust pressure pulsations in the airflow and thus eliminating noise.

[0030] Figures 4A to 4D show the structure of the exhaust housing 404 in a screw compressor according to another embodiment of the present application. In the illustrated embodiment, the other parts of the screw compressor, excluding the exhaust housing 404, have the same structure as the screw compressor 100 and are not shown here. Figure 4A shows a stereoscopic view of the exhaust housing 404 from one viewpoint, Figure 4B shows a stereoscopic view of the exhaust housing 404 from another viewpoint, Figure 4C shows a cross-sectional view of the exhaust housing 404 shown in Figure 4A along line BB, and Figure 4D shows a cross-sectional view of the exhaust housing 404 shown in Figure 4A along line CC, with white arrows indicating the direction of compressed gas flow.

[0031] As shown in Figures 4A to 4D, the exhaust housing cavity 414 of the exhaust housing 404 further comprises a housing cavity 431 and an exhaust channel 418. The housing cavity 431 is used to house components such as the ends of the rotor, and the exhaust channel 418 is used for fluid communication between the rotor housing cavity and the exhaust port 406. The exhaust channel 418 further comprises a silencing channel 417, and a silencing device 420 is located within the silencing channel 417. Unlike the exhaust housing 104 shown in Figure 3, in this embodiment the cross-sectional shape of the silencing channel 417 is rectangular. Furthermore, in this embodiment the external dimensions of the mounting portion 481 of the exhaust housing 404 are approximately the same as the dimensions of the mounting portion 381. The space occupied by the length, width, and height of the seat body 482 needs to roughly match the dimensions of the mounting portion 481, so the space occupied by the seat body 482 is approximately the same as the space occupied by the seat body 382. When the wall thickness of the sheet body 482 is the same, the cross-sectional shape of the silencing channel 417 in this application is configured to be rectangular, thereby increasing the flow area of ​​the silencing channel 417 within the same occupied space size as a rectangle, compared to other cross-sectional shapes (e.g., a circle as shown in Figure 3). Therefore, even if the silencing device 420 is placed inside the silencing channel 417, the pressure loss of the gas flow does not increase significantly by increasing the flow area of ​​the compressed gas, thereby allowing the compressed gas discharged from the exhaust port 406 to reach a predetermined pressure. In this embodiment, the sheet body 482 comprises a main body 483 and an end cover 484, the interior of the main body 483 is used to accommodate the silencing channel 417 having a rectangular cross-section, and the center of the end cover 484 is used to accommodate a circular exhaust port 406. Therefore, even if the cross-section of the silencing channel 417 is rectangular, the connection between the exhaust housing 404 and the external piping via the exhaust port 406 is not affected.

[0032] The silencing device 420 comprises at least one mounting sheet 419 and a plurality of silencing units. The silencing units have the same structure as the silencing unit 210 in Figure 3 and are not specifically shown in this embodiment. The silencing units are positioned on the side walls 434 of the mounting sheet 419 so that as the compressed gas flows through the silencing channel 417, the silencing units reduce the energy of the exhaust pressure pulsations, thereby reducing noise. In this embodiment, at least one mounting sheet 419 comprises four mounting sheets 419 arranged side by side, each mounting sheet 419 being a generally rectangular flat plate shape, spaced apart between the top and bottom of the housing cavity wall 416 of the exhaust housing 404, and extending along the direction of extension of the exhaust channel 418, so that the mounting sheets 419 do not obstruct the gas flow from the front, thereby reducing the pressure loss caused by mounting sheets 419 that obstruct the gas flow.

[0033] When the exhaust housing 404 is manufactured, the mounting sheet 419 for the silencing device 420 is first formed integrally with the silencing unit by a 3D printing process or a numerically controlled machining process, and then the silencing device 420 is connected to the housing cavity wall 416 in order to position these silencing devices 420 on the housing cavity wall 416. In embodiments, the silencing device 420 may be connected to the housing cavity wall 416 by interlocking connections, riveting, welding, adhesive, etc. In the embodiments shown in Figures 4A to 4D, the silencing device 420 further comprises a limiting structure positioned on the housing cavity wall 416 defining a silencing channel 417 and a limiting alignment structure positioned on the mounting sheet 419. The mounting sheet 419 can be connected to the housing cavity wall 416 via the mutually aligned limiting structure and limiting alignment structure. In this embodiment, the limiting structure comprises grooves 433 located on the top and bottom of the housing cavity wall 416, and the limiting alignment structure comprises mounting portions 435 located on the top and bottom of the mounting sheet 419, the size of which the mounting portions 435 and grooves 433 are matched so that the grooves 433 can accommodate the mounting portions 435 and thereby connect the mounting sheet 419 to the housing cavity wall 416. In this embodiment, the limiting structure further comprises a barrier strip 436, which extends longitudinally and connects to the top and bottom of the housing cavity wall 416. The barrier strip 436 is used to block and fix the position of the mounting sheet 419 in the extending direction of the sound-absorbing channel 417.

[0034] The silencer 420 may be made of the same material as the other parts of the exhaust housing 404, or it may be made of a different material. In this embodiment, the silencer 420 is made of an aluminum alloy material having a specific expansion capacity, while the other parts of the exhaust housing 404 are made of cast steel or cast iron material having higher strength.

[0035] Due to the high cost of 3D printing and numerically controlled machining, in this embodiment, the exhaust housing 404 is manufactured separately, and then the silencer 420 is connected to the housing cavity wall 416, thereby saving costs compared to the exhaust housing 104.

[0036] The silencing unit 210 in this application comprises a resonant silencing unit, which reduces noise by resonating with some of the noise's sound waves within the silencing channel. In other embodiments, the silencing unit 210 can also be used in combination with other types of silencing units, such as interference silencing units or quarter-wavelength tubes. Figures 5A and 5B show the structures of two embodiments of the silencing device 220 to illustrate the arrangement of the silencing unit 210 in the silencing device 220. In Figure 5A, the silencing unit 210 of the silencing device 220 comprises only the resonant silencing unit 540, while the silencing unit 210 in Figure 5B comprises the resonant silencing unit 540 and the interference silencing unit 550.

[0037] As shown in Figure 5A, a plurality of sequentially arranged resonant silencing units 540 are placed on the mounting sheet 219 of the silencing device 220, and these resonant silencing units 540 constitute an acoustic superstructure. Each resonant silencing unit 540 has a predetermined natural frequency. These resonant silencing units 540 reduce the excitation energy of exhaust pressure pulsations by resonating with sound waves having the same predetermined natural frequency in the noise within the silencing channel 217, thereby reducing exhaust noise. If at least some of the resonant silencing units 540 have different predetermined natural frequencies, these resonant silencing units 540 can reduce exhaust noise over a wide frequency range.

[0038] As an embodiment, these resonant silencing units 540 are evenly distributed on the mounting sheet 219, for example, in rows, with the resonant silencing units 540 in each row spaced apart, and the resonant silencing units 540 between adjacent rows arranged alternately. Each resonant silencing unit 540 comprises a resonant cavity 543, a connecting pipe 541, and a pressure balancing channel 542. The resonant cavity 543 is generally cylindrical and is axially positioned within the mounting sheet 219 along the thickness direction of the mounting sheet 219. The connecting pipe 541 and the pressure balancing channel 542 form holes on the outer surface of the mounting sheet 219 for fluid communication between the resonant cavity 543 inside the mounting sheet 219 and the silencing channel 217 outside the mounting sheet 219. The specific structure of each resonant silencing unit 540 will be described in detail with reference to Figures 6A and 6B.

[0039] As shown in Figure 5B, the arrangement mode of the resonant silencing unit 540 is the same as the arrangement mode of the embodiment shown in Figure 5A, except that the silencing unit 210 includes a plurality of interference silencing units 550 in addition to the resonant silencing unit 540 in the embodiment shown in Figure 5B. These interference silencing units 550 are arranged with spacing between adjacent resonant silencing units 540. In an embodiment, the interference silencing units 550 may also be arranged between the resonant silencing unit 540 and the edge of the mounting sheet 219. These interference silencing units 550 reduce exhaust noise by interfering with sound waves having a specific wavelength in the noise within the silencing channel 217. In a specific embodiment, each interference silencing unit 550 includes an interference channel (not shown), which forms an interference channel inlet 539 and an interference channel outlet 549 on the outer surface of the mounting sheet 219 so that the silencing channel 217 outside the mounting sheet 219 is in fluid communication with the interference channel, and the interference channel can function as a bypass pipe for the silencing channel 217. By designing the difference between the length of the interference channel between the interference channel inlet 539 and the interference channel outlet 549 and the length of the silencer channel 217 to be an odd multiple of half a wavelength, the gas flows out from the interference channel outlet 549 of the interference channel and then forms interference at the junction with the silencer channel 217, thereby reducing the noise energy.

[0040] Those skilled in the art will understand that in some other embodiments, a resonant silencer unit may also be used in conjunction with a quarter-wavelength tube silencer unit.

[0041] Compared to the embodiment shown in Figure 5A, the embodiment shown in Figure 5B has more sound-dampening units, which can achieve a better sound-dampening effect. However, more sound-dampening units may increase the size of the hollow portion of the mounting sheet 219, which may affect the strength of the mounting sheet 219. Those skilled in the art can determine the appropriate number of sound-dampening units depending on the actual noise and the material, strength, etc., of the mounting sheet 219.

[0042] Figures 6A and 6B show the specific structure of the resonance silencing unit 540, where Figure 6A is a schematic diagram of the structure of the resonance silencing unit 540 and Figure 6B is an axial cross-sectional view of Figure 6A. To illustrate the specific structure of the resonance silencing unit 540 more clearly, the resonance silencing unit 540 in Figure 6A schematically shows the cylindrical outer wall 644 around the resonance cavity 543 of the resonance silencing unit, which is actually formed by mounting sheets 219 that are spaced apart between the resonance silencing units 540.

[0043] As shown in Figures 6A and 6B, the side wall 334 of the mounting sheet 219 has walls 645 and 646, and the resonant cavity 543 of the resonant sound-absorbing unit 540 is located between walls 645 and 646. The connecting pipe 541 extends from wall 645 to the interior of the resonant cavity 543 over a certain length. The pressure-equalizing channel 542 is located on the opposite side of the connecting pipe 541, below the connecting pipe 541, and penetrates wall 645. The extending directions of the connecting pipe 541 and the pressure-equalizing channel 542 are generally parallel and both coincide with the axial direction of the resonant cavity 543. The connecting pipe 541 and the pressure-equalizing channel 542 can form a fluid communication between the resonant cavity 543 and the sound-absorbing channel 217 outside the mounting sheet 219. In one embodiment, the pressure equalizing channel 542 is located at the bottom of the wall 645, and the connecting pipe 541 is located at the top of the wall 645.

[0044] In this embodiment, the resonant cavity 543, the connecting pipe 541, and the pressure balancing channel 542 jointly form a resonant silencing unit 540. By setting the volume of the resonant cavity 543, the length of the connecting pipe 541, and the inner diameters of the pressure balancing channel 542 and the connecting pipe 541, each resonant silencing unit 540 can be made to have a predetermined natural frequency, and multiple resonant silencing units 540 can have different predetermined natural frequencies.

[0045] The pressure equalization channel 542 is used to equalize the pressure inside and outside the resonant cavity 543. Specifically, the gas entering the exhaust channel 218 after compression has a relatively high pressure, generating exhaust pressure pulsations. The pressure equalization channel 542 can equalize the pressure inside and outside the resonant cavity 543 to prevent the exhaust pressure pulsations from causing pressure shocks in the resonant cavity 543. Furthermore, if the gas entering the exhaust channel 218 is mixed with a liquid such as oil or water, the pressure equalization channel 542 also helps to discharge the liquid in the resonant cavity 543 from the connecting pipe 541 in a timely manner to prevent the resonant silencer unit 540 from being affected by the liquid in the resonant cavity 543 and to avoid failing to reach the expected predetermined natural frequency.

[0046] To further reduce the pressure impact on the resonant cavity 543 caused by exhaust pressure pulsation, in this embodiment, the inner surface of the wall 645 is also configured to be partially spherical. Those skilled in the art will understand that if the mounting portion is made of a material with higher strength, the inner surface of the wall 645 may also be configured to be planar or the like.

[0047] In some embodiments, the wall 546 may be formed by the side wall of the mounting sheet 219 opposite the wall 645. In some other embodiments, the sound-dampening units may be positioned on both opposing side walls of the mounting sheet 219, in which case the wall 546 may also be formed by the mounting sheet 219 between two opposing sound-dampening units.

[0048] The resonant silencing unit 540 in this application is capable of effectively avoiding the influence of exhaust pressure pulsations on the resonant silencing unit 540 by configuring the shape of the pressure balancing channel 542 and the wall 645, and is suitable for operation in high-pressure and liquid environments, and is therefore particularly suitable for placement on the defining wall of the exhaust channel of a compressor.

[0049] Figure 7 shows a three-dimensional structural diagram of another embodiment of the silencing device of Figure 4A. Silencing units not shown in Figure 7 have the same structure as the silencing unit 210 of Figure 3. As shown in Figure 7, the silencing device 720 comprises a plurality of mounting sheets 719. These mounting sheets 719 are generally rectangular flat plates and are stacked longitudinally and spaced apart so that compressed gas can flow through the space between these mounting sheets 719. Each mounting sheet 719 extends along the direction in which the exhaust channel 418 extends, so that the mounting sheets 719 do not obstruct the airflow, and the gas can reduce its ability to pulsate exhaust pressure as it flows through the mounting sheets 719, thereby reducing noise. In this embodiment, restricting structures such as grooves are located on the left and right sides of the housing cavity wall 416 that defines the silencing channel 417. Restricting and matching structures such as mounting portions 735 for insertion into the grooves are formed at the left and right ends of the mounting sheets 719.

[0050] Figure 8 shows a three-dimensional structural diagram of yet another embodiment of the silencing device of Figure 4A, and the silencing unit, which is omitted in Figure 8, has the same structure as the silencing unit 210 of Figure 3. As shown in Figure 8, the silencing device 820 comprises a plurality of mounting sheets 819. These mounting sheets 819 are generally corrugated plate-shaped and are arranged laterally spaced apart transversely so that compressed gas can flow through the space between these mounting sheets 819. Each mounting sheet 819 extends along the direction in which the exhaust channel 418 extends, so that the mounting sheets 819 do not obstruct the airflow, and the gas can reduce its ability to pulsate exhaust pressure as it flows through the mounting sheets 819, thereby reducing noise. In this embodiment, restricting structures such as grooves are located on the front and rear sides of the housing cavity wall 416 that defines the silencing channel 417. Restricting and matching structures such as mounting portions 835 for insertion into grooves are formed at the front and rear ends of the mounting sheets 819. In this embodiment, to further facilitate the secure attachment of the mounting sheet 819 to the housing cavity wall 416, the mounting portion 835 is also provided with a barrier strip 836, which extends in a different direction from the mounting portion 835, for example, in the left-to-right direction. Those skilled in the art will understand that, accordingly, the housing cavity wall 416 is also provided with slots at corresponding locations that match the shape and size of the barrier strip 836.

[0051] FIG. 9 shows a three-dimensional structural diagram of yet another embodiment of the silencing device of FIG. 4A. The silencing unit that is omitted in FIG. 9 has the same structure as the silencing unit 210 of FIG. 3. As shown in FIG. 9, the silencing device 920 includes a plurality of mounting sheets 919. These mounting sheets 919 are generally in the shape of rectangular flat plates and are arranged to intersect in the shape of the Chinese character "well" in the transverse and longitudinal directions so that compressed gas can flow through the space between these mounting sheets 919. Since each mounting sheet 919 extends along the direction in which the exhaust channel 418 extends, the mounting sheet 919 hardly blocks the air flow, and the gas can reduce the ability of the exhaust pressure pulsation when flowing through the mounting sheet 919, thereby reducing noise. In this embodiment, the limiting structures such as grooves are arranged at the top, bottom, and left and right sides of the accommodating cavity wall 416 that defines the silencing channel 417. The limiting alignment structures such as the mounting portion 935 for inserting into the groove are formed at the top, bottom, and left and right sides of the mounting sheet 919.

[0052] Figure 10 shows a three-dimensional structural diagram of yet another embodiment of the silencing device of Figure 4A, and the silencing unit, which is omitted in Figure 10, has the same structure as the silencing unit 210 of Figure 3. As shown in Figure 10, the silencing device 1020 comprises a plurality of mounting sheets 1019. These mounting sheets 1019 comprise a plurality of generally annular plates 1037 and a plurality of generally rectangular flat plates 1038. The plurality of plates 1037 are arranged in a sequential, enclosing manner and spaced apart, and the plates 1038 are arranged in a "cross" shape in the transverse and longitudinal directions and connected to each plate 1037, so that compressed gas can flow through the space between these mounting sheets 1019. Since each mounting sheet 1019 extends along the direction in which the exhaust channel 418 extends, the mounting sheets 1019 hardly obstruct the airflow, and the gas can reduce its ability to pulsate exhaust pressure as it flows through the mounting sheets 1019, thereby reducing noise. In this embodiment, restricting structures such as grooves are located at the top, bottom, left and right sides of the housing cavity wall 416 that defines the sound-absorbing channel 417. Restricting alignment structures such as mounting portions 1035 for insertion into the grooves are formed at the top, bottom, left and right sides of the plate 1038 of the mounting sheet 1019.

[0053] Figures 11A and 11B show the structure of the exhaust housing 1104 in yet another embodiment of the screw compressor according to this application. In the illustrated embodiment, the other parts of the screw compressor, excluding the exhaust housing 1104, are the same structure as the screw compressor 100. Figure 11A shows a stereoscopic view of the exhaust housing 1104 from one viewpoint, and Figure 11B shows a stereoscopic view of the exhaust housing 1104 from another viewpoint. As shown in Figures 11A and 11B, in this embodiment, the exhaust channel 1118 first extends along the axial direction of the rotor, and then bends about 90° to extend along the radial direction of the rotor. That is, the exhaust channel 1118 does not extend entirely along the axial direction, but has two substantially vertical parts. The exhaust port 1106 is located on the side of the screw compressor and is configured to form a 90° angle with the intake port 105 located on the rear side of the screw compressor.

[0054] The exhaust channel 1118 includes a silencing channel 1117, which extends radially along the rotor. The silencing device 1120 is located within the silencing channel 1117. In this embodiment, the silencing device 1120 comprises two intersecting mounting sheets 1119 and a silencing unit 1110. One mounting sheet is corrugated and connected to the front and rear sides of the housing cavity wall 1116 of the silencing channel 1117, while the other mounting sheet is longitudinally oriented and connected between the top and bottom of the housing cavity wall 1116 of the silencing channel 1117. Compressed gas can flow through the space between these mounting sheets 1119. The silencing unit 1110 is located on the side walls of the two mounting sheets 1119. Each mounting sheet 1119 extends along the direction in which the silencing channel 1117 extends, so the mounting sheets 1119 hardly obstruct the airflow, and the gas can reduce its ability to pulsate exhaust pressure as it flows through the mounting sheets 1119, thereby reducing noise. The silencing unit 1110 has the same structure as the silencing unit 210 in Figure 3 and will not be described again here.

[0055] In this embodiment, the screw compressor further comprises an additional silencing unit 1160. The additional silencing unit 1160 is positioned on the containment cavity wall 1146 defining the exhaust channel 1118 to further reduce noise as the compressed gas flows through the exhaust channel 1118. The structure of the additional silencing unit 1160 may be the structure of the resonant silencing unit 540 shown in Figure 5A, or the structure of the interference silencing unit 550 shown in Figure 5B.

[0056] In this embodiment, the exhaust housing 1104 is integrally molded by a 3D printing process or a numerically controlled machining process, i.e., the additional silencing unit 1160 is integrally formed with the housing cavity wall 1146, mounting sheet 1119, silencing unit 1110, and housing cavity wall 1116 defining the silencing channel 1117. Those skilled in the art will understand that in other embodiments, the silencing device 1140 may also be molded separately and then connected to the housing cavity wall 1116 of the silencing channel 1117 via limiting and limiting alignment structures, as described in the above embodiments.

[0057] Those skilled in the art will understand that, according to different embodiments of the screw compressor, the aforementioned exhaust housing shown in Figures 3, 4A-4D, and 11A-11B, and the silencing devices shown in Figures 7, 8, 9, and 10 can be used together or separately. To reduce or eliminate noise, the silencing device must be placed within the silencing channel so that the energy of the exhaust pressure pulsations can be reduced by the silencing device after the compressed gas enters the silencing channel.

[0058] The applicant has discovered that in existing screw compressors, the compressed gas flowing through the exhaust channel has high acoustic energy exhaust pressure pulsations, thereby causing vibration and noise in the screw compressor. In the process from the exhaust end of the rotor housing cavity through the exhaust channel to the exhaust port, the compressed gas in the exhaust channel is generally very hot and very high pressure and is often mixed with a liquid such as oil or water.

[0059] In the screw compressor of this application, the silencing device is positioned within the silencing channel of the exhaust channel to remove noise, i.e., it is positioned on the flow path through which the compressed gas is discharged from the exhaust port through the exhaust channel. Furthermore, the screw compressor of this application can be improved upon based on the structure of an existing screw compressor by simply adding the silencing device to the exhaust housing or by separately manufacturing an exhaust housing equipped with the silencing device, thereby reducing the impact on the structure of the existing screw compressor and lowering costs. Moreover, the silencing device of this application can balance the gas pressure loss caused by the silencing device without affecting the exhaust pressure of the screw compressor by increasing the flow path area of ​​the silencing channel.

[0060] The resonant silencing unit of this application has a pressure balancing channel and a partially spherical wall shape, thereby increasing the resonant silencing unit's ability to withstand pressure and preventing damage to the structure of the resonant silencing unit from exhaust pressure pulses. At the same time, it is possible to discharge any liquid accumulated in the silencing structure in real time, thereby ensuring a stable silencing effect of the silencing device. Therefore, the resonant silencing unit can be placed in an exhaust channel where the exhaust pressure pulsation energy is very high.

[0061] Furthermore, the resonant silencing unit of this application has an acoustic superstructure and reduces the energy of exhaust pressure pulsations by resonating with sound waves having a specific frequency in the noise in order to achieve the objective of noise reduction. Each resonant silencing unit has a good silencing effect and a small occupied space, and furthermore, multiple resonant silencing units having different predetermined natural frequencies can also remove noise in the exhaust channel over a wide frequency range.

[0062] Furthermore, the resonance silencing unit of this application can also be used in conjunction with other types of silencing devices, such as interference silencing units, to achieve a better silencing effect.

[0063] While this disclosure has been described in relation to the embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantial equivalents may be apparent to those skilled in the art, whether known or currently or soon foreseeable. Therefore, the embodiments of the present disclosure described above are intended to be illustrative, not restrictive. Various modifications may be made without departing from the spirit and scope of this disclosure. Accordingly, this disclosure is intended to encompass all known or previously developed alternatives, modifications, variations, improvements, and / or substantial equivalents. The technical effects and technical problems described herein are illustrative, not restrictive. It should be noted that the embodiments described herein may have other technical effects and may solve other technical problems.

Claims

1. It is a screw compressor, A housing (101) comprising a rotor housing (103) and an exhaust housing (104), wherein the rotor housing (103) defines a rotor housing cavity (213), the exhaust housing (104) defines an exhaust housing cavity (214), the rotor housing cavity (213) and the exhaust housing cavity (214) are in fluid communication, and an exhaust port (106) is located on the exhaust housing (104), the housing (101) and A pair of rotors (221) are arranged within the rotor housing cavity (213), and a compression housing cavity (225) can be formed between the teeth of the pair of rotors (221) and the housing (101), the rotor housing cavity (213) having an intake end (223) and an exhaust end (224), and the pair of rotors (221) are arranged such that as the pair of rotors (221) rotate, the gas entering the compression housing cavity (225) is compressed from the intake end (223) and then moves to the exhaust end (224), An exhaust channel (218) is located within the exhaust housing (104), and is configured to form a fluid communication between the exhaust end (224) and the exhaust port (106), and to discharge the compressed gas in the rotor housing cavity (213) from the exhaust port (106), A silencing device (220) is provided, which is located within the exhaust channel (218) and comprises at least one mounting sheet (219) and a plurality of silencing units (210), wherein the mounting sheet (219) has a side wall (334) extending along the direction of extension of the exhaust channel (218), and the plurality of silencing units (210) are located on the side wall (334) of the at least one mounting sheet (219), The silencing device (220) is configured such that the compressed gas entering the exhaust channel (218) from the rotor housing cavity (213) flows through the side wall (334) of the mounting sheet (219) and the silencing unit (210), and is then discharged from the exhaust port (106) of the screw compressor.

2. The exhaust channel (218) is provided with a sound-dampening channel (217), and the sound-dampening device (220) is arranged within the sound-dampening channel (217). The screw compressor according to claim 1, wherein the number of at least one mounting sheet (219) and the flow area of ​​the silencing channel (217) are configured such that the compressed gas discharged from the exhaust port (106) reaches a predetermined pressure.

3. The screw compressor according to claim 2, wherein the radial cross-section of the sound-dampening channel (217) is rectangular.

4. The screw compressor according to claim 2, wherein the sound-dampening device (220) is formed by a 3D printing process or a numerically controlled machining process.

5. The silencing device (220) comprises a limiting structure disposed on a housing cavity wall (216) defining the silencing channel (217) and a limiting alignment structure disposed on the mounting sheet (219), wherein the limiting structure is aligned with the limiting alignment structure so as to connect the mounting sheet (219) to the housing cavity wall (216), according to claim 4.

6. The screw compressor according to claim 5, wherein the limiting structure comprises a groove (433) disposed on the housing cavity wall (416), and the limiting alignment structure comprises a mounting portion (435) disposed on the mounting sheet (419), the mounting portion (435) being insertable into the groove (433).

7. The screw compressor according to claim 2, wherein the mounting sheet (219) is integrally formed with the housing cavity wall (216) that defines the sound-dampening channel (217).

8. The screw compressor according to claim 2, wherein the plurality of sound-dampening units (210) comprises a plurality of resonant sound-dampening units (540), and each resonant sound-dampening unit (540) is configured to have the predetermined natural frequency in order to reduce the noise in the exhaust channel (218) by resonating with sound waves having the predetermined natural frequency in the noise.

9. The screw compressor according to claim 8, wherein the resonant sound-dampening unit (540) is an acoustic superstructure, and at least a portion of the resonant sound-dampening unit (540) is configured to have different predetermined natural frequencies.

10. The screw compressor according to claim 9, wherein the side wall (334) of the mounting sheet (219) has a wall (645), and each resonant sound-dampening unit (540) comprises a resonant cavity (543) and a connecting pipe (541), the connecting pipe (541) extending from the wall (645) of the side wall (334) into the interior of the resonant cavity (543) and forming a fluid communication between the resonant cavity (543) and the exhaust channel (218).

11. The screw compressor according to claim 10, wherein the inner surface of the wall (645) is partially spherical.

12. The screw compressor according to claim 10, wherein each resonant silencing unit (540) further comprises a pressure equalizing channel (542), the pressure equalizing channel (542) extending through the wall (645) to form a fluid communication between the resonant cavity (543) and the exhaust channel (218).

13. The screw compressor according to claim 12, wherein each resonant sound-dampening unit (540) is configured to form a predetermined natural frequency based on the volume of the resonant cavity (543) and the length and inner diameter of the connecting pipe (541) and the pressure balancing channel (542).

14. The screw compressor according to any one of claims 1 to 13, further comprising an additional silencing device (1160), the additional silencing device (1160) positioned on a housing cavity wall (1146) defining the exhaust channel (1118), and the additional silencing device (1160) comprising a silencing unit (1110) according to any one of claims 8 to 13.

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