Compressor

Abstract

The present application provides a compressor, comprising: a housing, a screw rotor, a buffer chamber, at least one outlet passage, and an inlet passage. The housing has an inner wall and an outer wall; the screw rotor is located in the housing, and a compression chamber is formed between the screw rotor and the inner wall of the housing; the buffer chamber is arranged between the inner wall and the outer wall of the housing; a first end of the outlet passage is communicated with the buffer chamber, and a second end of the outlet passage passes through the inner wall of the housing to be communicated with the compression chamber; and a first end of the inlet passage is communicated with the buffer chamber and extends beyond the inner wall of the buffer chamber into the inside of the buffer chamber, and a second end of the inlet passage passes through the outer wall of the housing to be communicated with the outside of the housing.

Description

compressor Technical Field

[0001] This application relates to a compressor, and more particularly to a compressor with a vibration damping structure. Background Technology

[0002] A twin-screw compressor has a pair of meshing male and female rotors that compress the refrigerant through their relative rotation. The twin-screw compressor is connected to an economizer system, which supplies a portion of the refrigerant (or other media) into the compressor to increase its capacity. The economizer system is connected to the compressor's compression chamber via piping. Summary of the Invention

[0003] This application discloses a compressor, comprising: a housing, a screw rotor, a buffer chamber, at least one outlet channel and an inlet channel, wherein the housing has an inner wall and an outer wall; the screw rotor is located in the housing and forms a compression cavity between itself and the inner wall of the housing; the buffer chamber is disposed between the inner wall and the outer wall of the housing; a first end of the outlet channel communicates with the buffer chamber, and a second end passes through the inner wall of the housing and communicates with the compression cavity; a first end of the inlet channel communicates with the buffer chamber and extends beyond the inner wall of the buffer chamber into the interior of the buffer chamber, and a second end passes through the outer wall of the housing and communicates with the exterior of the housing.

[0004] In the compressor described above, the angle between the extending direction of the buffer chamber and the axial direction of the screw rotor is between 80° and 100°.

[0005] As described above, the compressor has an outlet channel including an outlet channel guide section connected to the buffer chamber, and an inlet channel including an inlet channel guide section located in the buffer chamber. The angle between the extension direction of the outlet channel guide section and the extension direction of the inlet channel guide section is between 80° and 100°.

[0006] As described above, in the compressor, the buffer chamber includes a cylindrical portion, the first end of the inlet channel communicates with the middle portion of the cylindrical portion in the axial direction, and the first end of the at least one outlet channel is located on one side of the first end of the inlet channel in the axial direction of the buffer chamber.

[0007] As described above, the compressor's inlet channel includes a constricted section, the cross-sectional area of ​​which gradually decreases in the direction of extension from the outer wall of the housing toward the buffer cavity.

[0008] As described above, the inlet channel further includes a flared section connected to the constricted section, and the flared section is further away from the outer wall of the housing than the constricted section. The cross-sectional area of ​​the inner wall of the flared section gradually increases in the direction of extension from the outer wall of the housing toward the buffer cavity.

[0009] As described above, the inlet channel of the compressor further includes a transition section, which is adjacent to the constricted section and closer to the outer wall of the housing. The transition section includes an inner wall and an outer wall, wherein the cross-sectional area of ​​the outer wall gradually decreases in the direction extending from the outer wall of the housing toward the buffer cavity, and the cross-sectional area of ​​the inner wall is smaller than the maximum cross-sectional area of ​​the constricted section; the cross-sectional area of ​​the inner wall gradually decreases in the direction extending from the outer wall of the housing toward the buffer cavity.

[0010] As described above, the compressor has at least two outlet channels connected to different locations of the compression chamber.

[0011] As described above, the compressor has an inlet channel outlet at the first end of the inlet channel, a fluid inlet at the second end of the inlet channel, and a buffer chamber with a mating part corresponding to the inlet channel outlet. The distance between the mating part and the inlet channel outlet is 0.8-1.2 times the diameter of the fluid inlet. The average cross-sectional area of ​​the buffer chamber is greater than 5 times the average cross-sectional area of ​​the inlet channel.

[0012] As described above, the compressor's inlet channel is connected to the external piping of the economizer.

[0013] The screw compressor in this application has a fluid passage connecting the compression chamber and the external economizer system. This fluid passage introduces refrigerant from the economizer into the compression chamber. During operation, the rotor teeth periodically sweep across the outlet of the fluid passage, resulting in pressure differences on both sides of the rotor teeth. This causes continuous pressure changes in the fluid passage, potentially leading to loosening or rupture of the piping connected to the economizer system due to vibration. This application incorporates a buffer chamber and an inlet passage at the fluid passage location to reduce the impact of pressure changes on the external piping of the economizer system. Attached Figure Description

[0014] Figure 1A is a perspective view of the compressor in this application;

[0015] Figure 1B is a side view of the compressor in Figure 1A;

[0016] Figure 1C is a sectional view of the compressor in Figure 1B taken along line AA;

[0017] Figure 2A is a perspective view of the first segment of the exhaust seat in Figure 1A;

[0018] Figure 2B is a top view of the first segment of the exhaust seat in Figure 2A;

[0019] Figure 2C is a sectional view of the first segment of the exhaust seat in Figure 2B, cut along line BB;

[0020] Figure 2D is a sectional view of the first segment of the exhaust seat in Figure 2B, cut along the CC line;

[0021] Figure 3 is a cross-sectional view of the first segment of the exhaust seat in the second embodiment of this application;

[0022] Figure 4 is a cross-sectional view of the first segment of the exhaust seat in the third embodiment of this application;

[0023] Figure 5 is a cross-sectional view of the first segment of the exhaust seat in the fourth embodiment of this application;

[0024] Figure 6 is a cross-sectional view of the first segment of the exhaust seat in the fifth embodiment of this application. Detailed Implementation

[0025] 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 terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "positive," "negative," "proximal," "farthest," "lateral," and "longitudinal," are used herein to describe various exemplary structural parts and elements, these terms are used only for illustrative purposes and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating direction are illustrative only and should not be considered limiting.

[0026] Figure 1A is a perspective view of the compressor in this application, Figure 1B is a side view of the compressor in Figure 1A, and Figure 1C is a cross-sectional view of the compressor in Figure 1B taken along line AA. As shown in Figures 1A-1C, the compressor 100 has a length direction L, a height direction H, and a width direction W. The compressor 100 includes a housing 101 and a screw rotor 110 located in the housing 101. The screw rotor 110 includes a male rotor 102 and a female rotor 103. The housing 101 has an outer wall 112 and an inner wall 111. The male rotor 102 and the female rotor 103 are located in the space enclosed by the inner wall 111 of the housing 101. The male rotor 102 and the female rotor 103 can be driven to rotate. The male rotor 102 is drivenly connected to a motor 160, such that the motor 160 can drive the male rotor 102 to rotate relative to the housing 101 about the axis of the male rotor 102. The female rotor 103 can be driven by the male rotor 102 to rotate relative to the housing 101 about its axis. The outer side of the male rotor 102 has multiple helical teeth 168 and helical grooves formed between adjacent teeth 168. The outer side of the female rotor 103 also has multiple helical teeth 169 and helical grooves formed between adjacent teeth 169. The teeth 168 and grooves of the male rotor 102 and the grooves and teeth 169 of the female rotor 103 form a meshing structure, such that the male rotor 102, female rotor 103, and the inner wall 111 of the housing 101 together form a compression cavity 105. A fluid passage 140 is provided in the housing 101 for supplying refrigerant to the compression cavity 105 of the compressor 100. The male rotor 102 and the female rotor 103 each have a shaft portion 126 and 127 at one end. The shaft portions 126 and 127 are installed in the housing 101, and the male rotor 102 and the female rotor 103 are able to rotate about the central axis of the shaft portions 126 and 127.

[0027] The housing 101 includes a rotor seat 183 and an exhaust seat 184. Fluid enters the compressor through the intake port 170, is compressed within the compressor's rotor seat 183, and flows to the exhaust seat 184. The high-temperature, high-pressure fluid is then discharged from the compressor through the exhaust port 180 and enters downstream pipelines and equipment. In one embodiment of this application, the exhaust seat 184 includes a first section 171 and a second section 172, with the first section 171 closer to the rotor seat 183 than the second section 172. A fluid passage 140 is located on the first section 171. The outlet of the fluid passage 140 communicates with the compression chamber 105, and the inlet is connected to an economizer system via a pipeline. The economizer system draws a portion of the refrigerant from the refrigeration cycle back to the compressor to increase its capacity. For example, the economizer system connects the fluid passage 140 to the bottom of the condenser or subcooler, drawing a small portion of liquid refrigerant from the bottom of the condenser or subcooler back to the compressor. This portion of liquid refrigerant can enter the compressor using natural pressure differential. In a screw compressor, the teeth of the male rotor 102 or female rotor 103 periodically pass through the fluid outlet of the fluid passage 140. Due to the significant pressure difference in the tooth grooves on both sides of the rotor teeth, the pressure at the flow outlet of the fluid passage 140 varies to a certain extent. The fluid passage 140 exhibits complex flow patterns and pressure pulsations, which may lead to the risk of loosening or rupture of the pipes connected to the economizer system due to vibration. The fluid passage 140 in this application is equipped with a pulsation attenuation structure, which can reduce the amplitude of pressure pulsations, thereby reducing the impact of pressure pulsations on external pipes.

[0028] Figure 2A is a perspective view of the first segment of the exhaust seat in Figure 1A, Figure 2B is a top view of the first segment of the exhaust seat in Figure 2A, Figure 2C is a sectional view of the first segment of the exhaust seat in Figure 2B along line BB, and Figure 2D is a sectional view of the first segment of the exhaust seat in Figure 2B along line CC.

[0029] As shown in Figures 2A-2D, the inner wall 111 of the housing forms rotor shaft cavities 284 and 282 at the first segment of the exhaust seat. Rotor shaft cavities 284 and 282 accommodate shaft portions 126 and 127 at one end of the male rotor 102 and female rotor 103. The first segment of the exhaust seat has an exhaust seat end face 202 facing the rotor seat 183. The exhaust ends of the male rotor 102 and female rotor 103 abut against the exhaust seat end face 202, which can close the end of the compression cavity 105. An internal exhaust cavity inlet 245 is also provided on the exhaust seat end face 202, and the compression cavity 105 can be aligned with the internal exhaust cavity inlet 245. During the rotation of the male rotor 102 and female rotor 103, the gas in the compression chamber 105 is continuously compressed until the compression chamber 105 is connected to the internal exhaust chamber inlet 245. Then, the gas in the compression chamber 105 enters the compressor's exhaust chamber through the internal exhaust chamber inlet 245 and is discharged from the exhaust chamber to the outside of the compressor through the exhaust port 180.

[0030] The fluid passage 140 has a fluid inlet 226 and fluid outlets 261 and 262. Fluid outlets 261 and 262 are located on the exhaust end face 202 of the housing and can be swept by the exhaust end of the male rotor 102 or female rotor 103, thereby enabling communication with the compression chamber 105. The fluid inlet 226 is located on the outer surface of the exhaust seat and communicates with an external pipeline for connecting to the economizer system, allowing the economizer system to replenish refrigerant into the compression chamber 105 via the fluid passage 140.

[0031] In another embodiment of this application, fluid outlets 261 and 262 may also be provided on the inner wall of the housing rotor seat 183, and can communicate with the compression cavity 105.

[0032] As shown in Figure 2C, the fluid passage 140 includes an inlet passage 241, a buffer chamber 208, and a pair of outlet passages 231 and 232. The buffer chamber 208 is located between the inner wall 111 and the outer wall 112 of the housing 101, and communicates with the outside of the compressor through the inlet passage 241 and with the compression chamber 105 through the pair of outlet passages 231 and 232. The portion of the buffer chamber 208 except for the portion communicating with the inlet passage 241 and the outlet passages 231 and 232 is closed. In one embodiment of this application, the buffer chamber 208 is generally cylindrical and extends generally along the width direction of the compressor (i.e., perpendicular to the axial direction of the screw rotor 110). In other embodiments of this application, the angle between the extension direction of the buffer chamber 208 and the axial direction of the screw rotor 110 is between 80° and 100°.

[0033] The buffer cavity 208 makes full use of the space between the inner wall 111 and the outer wall 112 of the housing 101, eliminating the need for additional installation space. The buffer cavity 208 has a certain volume, and the average area of ​​its cross-section (i.e., radial section) is more than five times the average area of ​​the cross-section of the inlet channel 241.

[0034] The inlet channel 241 extends from the outer wall 112 of the housing 101 toward the interior of the buffer chamber 208 and extends beyond the inner wall of the buffer chamber 208 along the height direction of the compressor. The portion of the inlet channel 241 located inside the buffer chamber 208 forms an inlet channel guide section 236. The inlet channel guide section 236 extends approximately along the height direction H of the compressor. The inlet channel 241 has a first end 292 and a second end 293. The second end 293 has a fluid inlet 226, and the first end 292 (i.e., the end away from the fluid inlet 226) is located in the middle of the buffer chamber 208 in the height direction. That is, the first end 292 of the inlet channel 241 is inserted into the interior of the buffer chamber 208. The inlet channel 241 includes a constriction section 271, a transition section 272, and an inlet section 273. The constriction section 271 is close to the first end 292, the inlet section 273 is close to the fluid inlet 226, and the transition section 272 is located between the inlet section 273 and the constriction section 271. The constricted section 271 has a lower opening 274 near the first end 292 and an upper opening 275 near the transition section 272, the area of ​​the lower opening 274 being smaller than the area of ​​the upper opening 275.

[0035] In one embodiment of this application, the constricted section 271 gradually narrows in diameter in the direction from the fluid inlet 226 toward the first end 292, forming a frustoconical shape. The inlet section 273 extends from the fluid inlet 226 toward the first end 292 of the inlet channel 241. The inner wall of the inlet section 273 has a uniform diameter. The transition section 272 includes a transition portion 278 located within the space enclosed by the inner wall 299 of the transition section 272. The transition portion 278 includes an inner wall 288 and an outer wall 289. The inner wall 288 connects to the inner wall of the inlet section 273 and extends smoothly toward the first end 292. The diameter of the inner wall 288 is approximately the same as the diameter of the inlet section 273. The cross-sectional area of ​​the inner wall 288 is smaller than the area of ​​the upper opening 275 of the constricted section 271, and there is a gap between the inner wall 288 and the upper opening 275. In one embodiment of this application, the cross-sectional area of ​​the inner wall 288 of the transition portion gradually decreases in the extending direction from the outer wall 112 of the housing toward the first end 292 of the inlet channel 241. A gap exists between the outer wall 289 of the transition portion and the inner wall 299 of the transition section, and the cross-sectional area of ​​the outer wall 289 of the transition portion gradually decreases in the extending direction from the outer wall 112 of the housing toward the first end 292 of the inlet channel 241. That is, the gap between the outer wall 289 of the transition portion and the inner wall 299 of the transition section gradually increases in the extending direction from the outer wall 112 of the housing toward the first end 292 of the inlet channel 241. A transition space 286 is formed between the outer wall 289 of the transition portion and the inner wall 299 of the transition section.

[0036] In another embodiment of this application, the inner wall 288 of the transition portion has a uniform inner diameter.

[0037] The outlet channel 231 has an outlet channel inlet 257 at one end and a fluid outlet 261 at the other end. The outlet channel 231 is connected to the buffer chamber 208 through the outlet channel inlet 257 and to the compression chamber 105 through the fluid outlet 261. The outlet channel 231 includes an outlet channel guide section 235 near the outlet channel inlet 257. The outlet channel guide section 235 is connected to the buffer chamber 208, and the angle between the extension direction of the outlet channel guide section 235 and the extension direction of the inlet channel guide section 236 is between 80° and 100°.

[0038] Similarly, the outlet channel 232 has an outlet channel inlet 258 at one end and a fluid outlet 262 at the other end. The outlet channel 232 communicates with the buffer chamber 208 through the outlet channel inlet 258 and with the compression chamber 105 through the fluid outlet 262. The outlet channel 232 includes an outlet channel guide section 237 near the outlet channel inlet 258. The outlet channel guide section 237 is connected to the buffer chamber 208, and the angle between the extension direction of the outlet channel guide section 237 and the extension direction of the inlet channel guide section 236 is between 80° and 100°.

[0039] In one embodiment of this application, the buffer chamber 208 has a mating portion 281 located at the bottom in the height direction H of the compressor. An inlet channel 241 extends from the outer wall 112 of the housing 101 towards the mating portion 281 of the buffer chamber 208 and is spaced from the bottom of the buffer chamber 208. In one embodiment of this application, the distance between the mating portion 281 and the inlet channel outlet 225 is 0.8-1.2 times the diameter of the fluid inlet 226 of the inlet channel 241. In another embodiment of this application, the distance between the mating portion 281 and the inlet channel outlet 225 is 0.9-1.1 times the diameter of the fluid inlet 226 of the inlet channel 241.

[0040] Outlet channel inlets 258 and 257 are located at the mating portion 281 of the buffer chamber 208. In the width direction of the compressor, outlet channel inlets 258 and 257 are located on both sides of the inlet channel 241, with a gap between them. Outlet channels 231 and 232 have front sections 247 and 248 communicating with outlet channel inlets 257 and 258, respectively. In one embodiment of this application, the extending directions of the front sections 247 and 248 are generally parallel to the extending direction of the inlet channel 241. Fluid outlets 261 and 262 correspond to the areas swept by the male rotor 102 and the female rotor 103, respectively. In other embodiments of this application, the number of outlet channels can be one or more, each outlet channel having a different fluid outlet position, communicating with different positions in the compression chamber. The average cross-sectional area of ​​the buffer chamber 208 is greater than five times the average cross-sectional area of ​​the outlet channel inlets 258 and 257.

[0041] In this application, fluid passage 140 connects the compression chamber 105 to the economizer pipeline, and the economizer pipeline is equipped with a valve device to prevent refrigerant and lubricating oil from flowing into the economizer. Fluid in fluid outlets 261 and 262 can enter the compression chamber 105. The fluid pressure at fluid outlets 261 and 262 exhibits periodic fluctuations (referred to as "pressure pulsations") as the screw rotor rotates. The fluid pressure pulsations at fluid outlets 261 and 262 enter the buffer chamber 208 through outlet passages 231 and 232. The buffer chamber 208 has a large cross-sectional area and volume, and the fluid pressure pulsations are buffered within the buffer chamber 208, reducing the pulsation amplitude. The inlet channel 241 has a constriction section 271 and a transition section 272. When the fluid pressure pulsation in the buffer cavity 208 encounters the outer wall of the inlet channel 241, part of the pulsation energy will be reflected (at the echo source). Then, the pressure pulsation enters the constriction section 271 from the buffer cavity 208, where not only does the flow direction change by 90 degrees, but the flow cross-sectional area also suddenly shrinks, thus further generating some reflection and diffraction of the pulsation energy. Next, the pressure pulsation in the constriction section 271 enters the transition section 272. Part of the fluid pressure pulsation energy directly enters the channel enclosed by the inner wall 288 of the transition section and will again generate energy reflection due to the sudden shrinkage of the cross-section. The remaining part first enters the transition space 286 formed between the outer wall 289 of the transition section and the inner wall 299 of the transition section. After being reflected by the wall of this space, a part of it will be reflected and diffracted again when it enters the channel enclosed by the inner wall 299 of the transition section. During the process of fluid pressure pulsation energy traveling from the buffer chamber 208 through the constriction section 271 and the transition section 272 to the fluid inlet 226, the pulsation energy is reflected and diffracted multiple times, thus effectively reducing the fluctuation amplitude of fluid pressure pulsation.

[0042] In this embodiment, the fluid at fluid outlets 261 and 262 experiences certain pressure fluctuations. The structure of the buffer chamber 208 and the inlet channel 241 effectively attenuates the pressure pulsation amplitude of the fluid propagating upstream from fluid outlets 261 and 262 via this path, significantly reducing the pressure fluctuation at fluid inlet 226. That is, the pressure pulsation amplitude at fluid outlets 261 and 262 continuously decreases as it propagates to fluid inlet 226, resulting in smaller (effectively suppressed) pressure pulsations at fluid inlet 226. Fluid inlet 226 is connected to the economizer pipeline. The smaller pressure pulsations at fluid inlet 226 reduce vibration in the external economizer pipeline, making it less prone to loosening or other adverse conditions, effectively ensuring the operational reliability of the economizer structural system.

[0043] Figure 3 is a cross-sectional view of the first segment of the exhaust seat in the second embodiment of this application. The cutting position in this view is the same as the cutting position in the cross-sectional view of the exhaust seat in the first embodiment of Figure 2C. The embodiment shown in Figure 3 is structurally similar to the first embodiment shown in Figures 2A-2D, except that the structure of the inlet channel is different.

[0044] As shown in Figure 3, similar to the embodiments shown in Figures 2A-2D, the inlet channel 341 extends from the outer wall 112 of the housing 101 toward the interior of the buffer chamber 308 and extends beyond the inner wall of the buffer chamber 308 along the height direction of the compressor. The portion of the inlet channel 341 located inside the buffer chamber 308 forms an inlet channel guide section 336. The inlet channel guide section 336 extends approximately along the height direction H of the compressor. The inlet channel 341 has a first end 392 and a second end 393. The second end 393 has a fluid inlet 326, and the first end 392 (i.e., the end away from the fluid inlet 326) is located in the middle of the buffer chamber 208 in the height direction. That is, the first end 392 of the inlet channel 341 is inserted into the interior of the buffer chamber 308. The inlet channel 341 includes a constricted section 371 and a flared section 372. The constricted section 371 is closer to the second end 393, and the flared section 372 is closer to the first end 392.

[0045] In one embodiment of this application, the constricted section 371 gradually narrows in diameter from the fluid inlet 326 towards the first end 392. The flared section 372 gradually widens in diameter from the fluid inlet 326 towards the first end 392. The flared section 372 and the constricted section 371 are smoothly connected at the ends away from the fluid inlet 326, thus the constricted section 371 and the flared section 372 together form a shape that is narrow in the middle and wide at both ends. During the flow of fluid from the second end 393 of the inlet channel 341 to the first end 392, the flow cross-sectional area of ​​the inlet channel 341 first decreases and then increases. The fluid smoothly passes through the constricted section in the middle, which can change the flow state of the fluid and reduce the pressure pulsation energy in the fluid.

[0046] In this embodiment, the structure of the buffer cavity 308 is the same as that shown in the embodiment of FIG. 2A. The angle between the extending direction of the buffer cavity 308 and the axial direction of the screw rotor 110 is between 80° and 100°. The average cross-sectional area of ​​the buffer cavity 308 is more than 5 times the average cross-sectional area of ​​the inlet channel 341. The buffer cavity 308 has a mating portion 381 located at the bottom. The distance between the fluid outlet on the first end 392 of the inlet channel 341 and the mating portion 381 is 0.8-1.2 times the diameter of the fluid inlet 326 of the inlet channel 341.

[0047] In this embodiment, there are four outlet channels, namely outlet channels 331, 332, 333, and 334. Each outlet channel is connected to a different location in the compression cavity 105, enabling gas replenishment to different locations within the compression cavity 105. The average cross-sectional area of ​​the buffer cavity 308 is greater than five times the average cross-sectional area of ​​the outlet channel inlet. As fluid pressure pulsations enter the buffer cavity 308 from outlet channels 331, 332, 333, and 334, and then from the buffer cavity 308 into the inlet channel 341, in addition to the attenuation effect of the buffer cavity on the pressure pulsations, the pressure pulsations undergo multiple reflections and diffractions during propagation due to the continuous changes in flow direction and cross-section, resulting in a continuous reduction in the amplitude of the pressure pulsations transmitted upstream. In this embodiment, the buffer cavity 308, outlet channels 331, 332, 333, and 334, and inlet channel 341 together constitute a pulsation attenuation structure to reduce fluid pressure pulsations in the gas replenishment channels, thereby effectively reducing vibration of the external economizer pipeline connected to the gas replenishment channels.

[0048] Figure 4 is a cross-sectional view of the first segment of the exhaust seat according to the third embodiment of this application. The cutting position in this view is the same as the cutting position in the cross-sectional view of the exhaust seat of the first embodiment in Figure 2C. The embodiment shown in Figure 4 is structurally similar to the second embodiment shown in Figure 3, except that the structure of the inlet channel is different.

[0049] As shown in Figure 4, similar to the embodiments shown in Figures 2A-2D, the inlet channel 441 extends from the outer wall 112 of the housing 101 toward the interior of the buffer chamber 408 and extends beyond the inner wall of the buffer chamber 408 along the height direction of the compressor. The portion of the inlet channel 441 located inside the buffer chamber 408 forms an inlet channel guide section 436. The inlet channel guide section 436 extends approximately along the height direction H of the compressor. The inlet channel 441 has a first end 492 and a second end 493. The second end 493 has a fluid inlet 426, and the first end 492 (i.e., the end away from the fluid inlet 426) is located at the center in the height direction of the buffer chamber 408. That is, the first end 492 of the inlet channel 441 is inserted into the interior of the buffer chamber 408. The inlet channel 441 includes a constriction section 471.

[0050] In one embodiment of this application, the constricted section 471 gradually narrows in diameter in the direction from the fluid inlet 426 to the first end 492. The constricted section 471 extends from the second end 493 of the inlet channel 441 to the first end 492. As the fluid flows from the second end 493 to the first end 492 of the inlet channel 441, the flow cross-sectional area of ​​the inlet channel 441 continuously decreases to increase the degree of abrupt narrowing of the flow cross-section when pressure pulsation energy enters the inlet channel 441 from the buffer chamber 408, thereby obtaining relatively more pulsation energy reflection and reducing diffraction.

[0051] In this embodiment, the structure of the buffer cavity 408 is the same as that shown in the embodiment of FIG. 2A. The angle between the extending direction of the buffer cavity 408 and the axial direction of the screw rotor 110 is between 80° and 100°. The average cross-sectional area of ​​the buffer cavity 408 is greater than 5 times the average cross-sectional area of ​​the inlet channel 441. The distance between the fluid outlet on the first end 492 of the inlet channel 441 and the mating part 481 is 0.8-1.2 times the diameter of the fluid inlet 426 of the inlet channel 441.

[0052] In this embodiment, there are four outlet channels, namely outlet channels 431, 432, 433, and 434. Each outlet channel is connected to a different position in the compression cavity 105, enabling gas replenishment to different positions in the compression cavity 105. As fluid pressure pulsations enter the buffer cavity 408 from outlet channels 431, 432, 433, and 434, and then enter the inlet channel 441 from the buffer cavity 408, in addition to the attenuation effect of the buffer cavity 408 on the pressure pulsations, the pressure pulsations undergo multiple reflections and diffractions during propagation due to the continuous changes in the flow direction and flow cross-section, resulting in a continuous reduction in the amplitude of the pressure pulsations transmitted upstream. In this embodiment, the buffer cavity 408, outlet channels, and inlet channel 441 together constitute an attenuation structure to reduce fluid pressure pulsations in the gas replenishment channel, thereby effectively reducing the vibration of the external economizer pipeline connected to the gas replenishment channel.

[0053] Figure 5 is a cross-sectional view of the first segment of the exhaust seat according to the fourth embodiment of this application. The cutting position in this view is the same as the cutting position in the cross-sectional view of the exhaust seat of the first embodiment in Figure 2C. The embodiment shown in Figure 5 is structurally similar to the third embodiment shown in Figure 4, except that the structure of the inlet channel is different.

[0054] As shown in Figure 5, similar to the embodiments shown in Figures 2A-2D, the inlet channel 541 extends from the outer wall 112 of the housing 101 toward the interior of the buffer chamber 508 and extends beyond the inner wall of the buffer chamber 508 along the height direction of the compressor. The portion of the inlet channel 541 located inside the buffer chamber 508 forms an inlet channel guide section 536. The inlet channel guide section 536 extends approximately along the height direction H of the compressor. The inlet channel 541 has a first end 592 and a second end 593. The second end 593 has a fluid inlet 526, and the first end 592 (i.e., the end away from the fluid inlet 526) is located at the center in the height direction of the buffer chamber 508. That is, the first end 592 of the inlet channel 541 is inserted into the interior of the buffer chamber 508. The inlet channel 541 includes a constriction section 571 and an outlet section 572.

[0055] In one embodiment of this application, the constriction section 571 gradually narrows in diameter in the direction from the fluid inlet 526 to the first end 592. The outlet section 572 is connected to the constriction section 571 and located near the first end 592. The outlet section 572 has an upper opening 577 communicating with the constriction section 571 and a lower opening 578 located at the first end 592. The upper opening 577 is smaller than the lower opening 578. The inner wall of the outlet section 572 is arc-shaped along the extension direction of the inlet channel 541. During the flow of fluid from the second end 593 of the inlet channel 541 to the first end 592, the flow cross-sectional area of ​​the inlet channel 541 continuously decreases in the constriction section 571 and smoothly changes in the outlet section 572, thereby altering the fluid flow state and reducing the flow resistance of the supplementary fluid.

[0056] In this embodiment, the structure of the buffer cavity 508 is the same as that shown in the embodiment of FIG. 2A. The angle between the extending direction of the buffer cavity 508 and the axial direction of the screw rotor 110 is between 80° and 100°. The average cross-sectional area of ​​the buffer cavity 508 is more than 5 times the average cross-sectional area of ​​the inlet channel 541. The distance between the fluid outlet on the first end 592 of the inlet channel 541 and the mating part 581 is 0.8-1.2 times the diameter of the fluid inlet 526 of the inlet channel 541.

[0057] In this embodiment, there are four outlet channels, namely outlet channels 531, 532, 533, and 534. Each outlet channel is connected to a different location in the compression cavity 105, enabling gas replenishment to different locations within the compression cavity 105. The average cross-sectional area of ​​the buffer cavity 508 is greater than five times the average cross-sectional area of ​​the outlet channel inlet. During the process of fluid pressure pulsations entering the buffer cavity 508 from the outlet channel and then entering the inlet channel 541 from the buffer cavity 508, in addition to the attenuation effect of the buffer cavity 508 on the pressure pulsation energy, the pressure pulsations undergo multiple reflections and diffractions during propagation due to the continuous changes in the flow direction and cross-sectional area, resulting in a continuous decrease in the amplitude of the pressure pulsation energy transmitted upstream. In this embodiment, the buffer cavity 508, the outlet channels, and the inlet channel 541 together constitute an attenuation structure to reduce fluid pressure pulsations in the gas replenishment channel, thereby effectively reducing the vibration of the external economizer pipeline connected to the gas replenishment channel.

[0058] Figure 6 is a cross-sectional view of the first segment of the exhaust seat according to the fifth embodiment of this application. The cutting position in this view is the same as the cutting position in the cross-sectional view of the exhaust seat of the first embodiment in Figure 2C. The embodiment shown in Figure 6 is structurally similar to the fourth embodiment shown in Figure 5, except that the structure of the inlet channel is different.

[0059] As shown in Figure 6, similar to the embodiments shown in Figures 2A-2D, the inlet channel 641 extends from the outer wall 112 of the housing 101 toward the interior of the buffer cavity 608 and extends beyond the inner wall of the buffer cavity 608 along the height direction of the compressor. The portion of the inlet channel 641 located inside the buffer cavity 608 forms an inlet channel guide section 636. The inlet channel guide section 636 extends approximately along the height direction H of the compressor. The inlet channel 641 has a first end 692 and a second end 693. The second end 693 has a fluid inlet 626, and the first end 692 (i.e., the end away from the fluid inlet 626) is located at the center in the height direction of the buffer cavity 608. That is, the first end 692 of the inlet channel 641 is inserted into the interior of the buffer cavity 608. The inner wall of the inlet channel 641 extends uniformly and smoothly, so that the cross-sectional area of ​​the inlet channel 641 is approximately equal at all points.

[0060] In this embodiment, the structure of the buffer cavity 608 is the same as that shown in the embodiment of FIG. 2A. The angle between the extending direction of the buffer cavity 608 and the axial direction of the screw rotor 110 is between 80° and 100°. The average cross-sectional area of ​​the buffer cavity 608 is more than 5 times the average cross-sectional area of ​​the inlet channel 641. The distance between the fluid outlet on the first end 692 of the inlet channel 641 and the mating part 681 is 0.8-1.2 times the diameter of the fluid inlet 626 of the inlet channel 641.

[0061] In this embodiment, as the fluid pressure pulsation energy enters the buffer chamber 608 from the outlet channel and then enters the inlet channel 641 from the buffer chamber 608, in addition to the attenuation effect of the buffer chamber on the pressure pulsation energy, the pressure pulsation also undergoes multiple reflections and diffractions during propagation due to the continuous changes in the flow direction and cross-sectional area, resulting in a continuous decrease in the magnitude of the pressure pulsation energy propagating upstream. In this embodiment, the buffer chamber 608, the outlet channel, and the inlet channel 641 together constitute an attenuation structure to reduce the fluid pressure pulsation in the air supply channel, thereby effectively reducing the vibration of the external economizer pipeline connected to the air supply channel.

[0062] 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 currently or soon to be foreseen, will likely be apparent to those skilled in the art. Furthermore, the technical effects and / or technical problems described herein are exemplary and not limiting; therefore, the disclosures herein may be used to solve other technical problems and achieve other technical effects. Accordingly, the examples of embodiments of this disclosure as set forth above are intended to be illustrative and not restrictive. Various changes may 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.

Claims

1. A compressor, characterized in that... include: A housing having an inner wall and an outer wall; A screw rotor, wherein the screw rotor is located in the housing and forms a compression cavity between itself and the inner wall of the housing; A buffer cavity is disposed between the inner wall and the outer wall of the housing; At least one outlet channel, the first end of which communicates with the buffer cavity, and the second end of which passes through the inner wall of the housing and communicates with the compression cavity; An inlet channel, the first end of which communicates with the buffer cavity and extends beyond the inner wall of the buffer cavity into the interior of the buffer cavity, and the second end which passes through the outer wall of the housing and communicates with the outside of the housing.

2. The compressor as described in claim 1, characterized in that: The angle between the extension direction of the buffer cavity and the axial direction of the screw rotor is between 80° and 100°.

3. The compressor as described in claim 1, characterized in that: The outlet channel includes an outlet channel guide section connected to the buffer cavity, and the inlet channel includes an inlet channel guide section located in the buffer cavity. The angle between the extension direction of the outlet channel guide section and the extension direction of the inlet channel guide section is between 80° and 100°.

4. The compressor as described in claim 1, characterized in that: The buffer cavity includes a cylindrical portion, the first end of the inlet channel is connected to the middle of the cylindrical portion in the axial direction, and the first end of the at least one outlet channel is located on one side of the first end of the inlet channel in the axial direction of the buffer cavity.

5. The compressor as described in claim 1, characterized in that: The inlet channel includes a narrowed section, the cross-sectional area of ​​the inner wall of which gradually decreases in the direction of extension from the outer wall of the housing toward the buffer cavity.

6. The compressor as described in claim 5, characterized in that: The inlet channel also includes a flared section connected to the constricted section, and the flared section is further away from the outer wall of the housing than the constricted section. The cross-sectional area of ​​the inner wall of the flared section gradually increases in the direction of extension from the outer wall of the housing toward the buffer cavity.

7. The compressor as described in claim 5, characterized in that: The inlet channel further includes a transition section, which is adjacent to the constricted section and closer to the outer wall of the housing. The transition section includes an inner wall and an outer wall, wherein the cross-sectional area of ​​the outer wall gradually decreases in the direction extending from the outer wall of the housing toward the buffer cavity, and the cross-sectional area of ​​the inner wall is smaller than the maximum cross-sectional area of ​​the constricted section; the cross-sectional area of ​​the inner wall gradually decreases in the direction extending from the outer wall of the housing toward the buffer cavity.

8. The compressor as described in claim 1, characterized in that: The at least one outlet channel includes at least two outlet channels, which are connected to different locations of the compression cavity.

9. The compressor as described in claim 1, characterized in that: The first end of the inlet channel has an inlet channel outlet, the second end of the inlet channel has a fluid inlet, the buffer cavity has a mating part corresponding to the inlet channel outlet, and the distance between the mating part and the inlet channel outlet is 0.8-1.2 times the diameter of the fluid inlet; The average area of ​​the cross-section of the buffer cavity is greater than 5 times the average area of ​​the cross-section of the inlet channel.

10. The compressor as claimed in claim 1, characterized in that: The inlet channel is connected to the external pipeline of the economizer.

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