Compressor

Abstract

The invention provides a compressor which comprises a shell, a screw rotor, a buffer cavity, at least one outlet channel and an inlet channel, and the shell is provided with an inner wall and an outer wall; the screw rotor is located in the shell, and a compression containing cavity is formed between the screw rotor and the inner wall of the shell. The buffer cavity is arranged between the inner wall and the outer wall of the shell; the first end of the outlet channel is communicated with the buffer cavity, and the second end of the outlet channel penetrates through the inner wall of the shell and is communicated with the compression containing cavity; the first end of the inlet channel is communicated with the buffering cavity and extends out of the inner wall of the buffering cavity to the interior of the buffering cavity, and the second end of the inlet channel penetrates through the outer wall of the shell to be communicated with the exterior of the shell.

Description

Technical Field

[0001] The present application relates to a compressor, and in particular to a compressor with a shock absorbing structure. Background Art

[0002] The twin-screw compressor has a pair of male and female rotors that can mesh with each other, and the refrigerant is compressed by the relative rotation of the male and female rotors. The twin-screw compressor is connected to the economizer system, which provides a portion of the refrigerant (or other medium) to the inside of the compressor to improve the capacity of the twin-screw compressor. The economizer system is connected to the compression chamber of the compressor through a pipeline. Summary of the invention

[0003] The present application discloses a compressor, comprising: a shell, a screw rotor, a buffer chamber, at least one outlet channel and an inlet channel, wherein the shell has an inner wall and an outer wall; the screw rotor is located in the shell and forms a compression chamber with the inner wall of the shell; the buffer chamber is arranged between the inner wall and the outer wall of the shell; the first end of the outlet channel is communicated with the buffer chamber, and the second end passes through the inner wall of the shell to communicate with the compression chamber; the first end of the inlet channel is communicated with the buffer chamber and extends beyond the inner wall of the buffer chamber to the interior of the buffer chamber, and the second end passes through the outer wall of the shell to communicate with the outside of the shell.

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

[0005] In the compressor as described above, the outlet channel includes an outlet channel guide section connected to the buffer chamber, the inlet channel includes an inlet channel guide section located in the buffer chamber, and 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 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 chamber.

[0007] In the compressor as described above, the inlet passage comprises a constricted section, and the cross-sectional area of ​​the inner wall of the constricted section gradually decreases in the extending direction from the outer wall of the shell toward the buffer chamber.

[0008] As described above, in the compressor, the inlet passage further comprises a flaring section, which is connected to the narrowing section, and the cross-sectional area of ​​the inner wall of the flaring section gradually increases in the extension direction from the outer wall of the shell toward the buffer chamber compared to the narrowing section which is further away from the outer wall of the shell.

[0009] As described above, the compressor, the inlet channel also includes a transition portion, the transition portion is adjacent to the necking section and closer to the outer wall of the shell, the transition portion includes a transition portion inner wall and a transition portion outer wall, wherein the cross-sectional area of ​​the transition portion outer wall gradually decreases in the extension direction from the outer wall of the shell toward the buffer cavity, and the cross-sectional area of ​​the transition portion inner wall is smaller than the maximum cross-sectional area of ​​the necking section; the cross-sectional area of ​​the transition portion inner wall gradually decreases in the extension direction from the outer wall of the shell toward the buffer cavity.

[0010] In the compressor as described above, the at least one outlet channel includes at least two outlet channels, and the at least two outlet channels are connected to different positions of the compression chamber.

[0011] As described above, in the compressor, 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 matching portion corresponding to the inlet channel outlet, and the spacing between the matching portion 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.

[0012] In the compressor as described above, the inlet passage is communicated with an external pipeline of the economizer.

[0013] The screw compressor in the present application has a fluid channel that can connect the compression chamber and the external economizer system. The fluid channel can introduce the refrigerant in the economizer into the compression chamber. Because the teeth of the rotor periodically sweep the outlet of the fluid channel during the operation of the screw compressor, the pressure in the tooth grooves on both sides of the rotor teeth is different, which causes the fluid pressure in the fluid channel to constantly change, which may cause the pipeline connected to the economizer system to loosen or rupture due to vibration. A buffer chamber and an inlet channel are provided at the fluid channel in the present application, which can reduce the impact of pressure changes on the external pipelines of the economizer system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A is a three-dimensional diagram of the compressor in the present application;

[0015] Figure 1B yes Figure 1A Side view of the compressor;

[0016] Figure 1C yes Figure 1BA cross-sectional view of the compressor along line AA;

[0017] Figure 2A yes Figure 1A A perspective view of a first segment of a mid-exhaust seat;

[0018] Figure 2B yes Figure 2A a side view of a first segment of the exhaust seat;

[0019] Figure 2C yes Figure 2B A cross-sectional view of the first section of the middle exhaust seat cut along line BB;

[0020] Figure 2D yes Figure 2B A cross-sectional view of the first section of the middle exhaust seat cut along line CC;

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

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

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

[0024] Figure 6 It is a cross-sectional view of a first segment of an exhaust seat according to a fifth embodiment of the present application. DETAILED DESCRIPTION

[0025] Various specific embodiments of the present application will be described below with reference to the accompanying drawings that form a part of this specification. It should be understood that although terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "positive", "negative", "proximal", "distal", "lateral", "longitudinal", etc., are used in the present application to describe various example structural parts and elements of the present application, these terms are used here only for the purpose of convenience of description, and these terms are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present application can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations.

[0026] Figure 1A is a three-dimensional diagram of the compressor in this application, Figure 1B yes Figure 1A Side view of the compressor. Figure 1C yes Figure 1B The cross-sectional view of the compressor along the AA line. Figure 1A-Figure 1CAs shown, the compressor 100 has a length direction L, a height direction H and a width direction W. The compressor 100 includes a shell 101 and a screw rotor 110 located in the shell 101. The screw rotor 110 includes a male rotor 102 and a female rotor 103. The shell 101 has an outer wall 112 and an inner wall 111. The male rotor 102 and the female rotor 103 are located in a space surrounded by the inner wall 111 of the shell 101. The male rotor 102 and the female rotor 103 can be driven to rotate. The male rotor 102 is transmission-connected to the motor 160, so that the motor 160 can drive the male rotor 102 to rotate relative to the shell 101 around the axis of the male rotor 102. The female rotor 103 can be driven by the male rotor 102 to rotate relative to the shell 101 around the axis of the female rotor 103. The outer side of the male rotor 102 has a plurality of spiral teeth 168 and spiral grooves formed between adjacent teeth 168, and the outer side of the female rotor 103 also has a plurality of spiral teeth 169 and spiral 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 mutually meshing structure, so that the male rotor 102, the female rotor 103 and the inner wall 111 of the housing 101 together enclose a compression chamber 105. The housing 101 is provided with a fluid channel 140 for providing refrigerant to the compression chamber 105 of the compressor 100. The male rotor 102 and the female rotor 103 have shafts 126 and 127 at one end, and the shafts 126 and 127 are installed in the housing 101, and the male rotor 102 and the female rotor 103 can rotate around the central axis of the shafts 126 and 127.

[0027] The housing 101 includes a rotor seat 183 and an exhaust seat 184. The fluid enters the compressor from the air intake port 170, is compressed from the rotor seat 183 in the compressor and flows to the exhaust seat 184, and then the high-temperature and high-pressure fluid is discharged from the compressor through the exhaust port 180 and enters the downstream pipeline and equipment. In one embodiment of the present application, the exhaust seat 184 includes a first segment 171 and a second segment 172, and the first segment 171 is closer to the rotor seat 183 than the second segment 172. The fluid channel 140 is located on the first segment 171. The outlet of the fluid channel 140 is connected to the compression chamber 105, and the inlet is connected to the economizer system through a pipeline. The economizer system leads a part of the refrigerant in the refrigeration cycle system back to the compressor to improve the capacity of the compressor. For example, the economizer system connects the fluid channel 140 with the bottom of the condenser or the subcooler, and leads a small part of the refrigerant liquid from the bottom of the condenser or the subcooler back to the compressor. This part of the refrigerant liquid can enter the compressor using the natural pressure difference. In the screw compressor, the teeth of the male rotor 102 or the female rotor 103 periodically pass through the fluid outlet of the fluid channel 140. Since the pressure in the tooth grooves on both sides of the rotor teeth is significantly different, the pressure at the flow outlet of the fluid channel 140 changes to a certain extent. The complex flow state and pressure pulsation in the fluid channel 140 may cause the risk of loosening or rupture of the interface of the pipeline connected to the economizer system due to vibration. The fluid channel 140 in the present application is provided with a pulsation attenuation structure, which can reduce the amplitude of the pressure pulsation, thereby reducing the impact of the pressure pulsation on the external pipeline.

[0028] Figure 2A yes Figure 1A A three-dimensional view of the first segment of the middle exhaust seat, Figure 2B yes Figure 2A A side view of the first section of the exhaust seat, Figure 2C yes Figure 2B The cross-sectional view of the first section of the middle exhaust seat along the BB line, Figure 2D yes Figure 2B Cross-sectional view of the first segment of the middle exhaust seat taken along line CC.

[0029] like Figure 2A-2DAs shown, the inner wall 111 of the housing forms rotor shaft cavities 284 and 282 at the first section of the exhaust seat. The rotor shaft cavities 284 and 282 are used to accommodate the shaft portions 126 and 127 at one end of the male rotor 102 and the female rotor 103. The first section of the exhaust seat has an exhaust seat end face 202 facing the rotor seat 183, and the exhaust ends of the male rotor 102 and the female rotor 103 abut against the exhaust seat end face 202, and the exhaust seat end face 202 can close the end of the compression chamber 105. The exhaust seat end face 202 is also provided with an internal exhaust chamber inlet 245, and the compression chamber 105 can be aligned with the internal exhaust chamber inlet 245. During the rotation of the male rotor 102 and the 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. The gas in the compression chamber 105 enters the exhaust chamber of the compressor through the internal exhaust chamber inlet 245, and then is discharged from the exhaust chamber to the outside of the compressor via the exhaust port 180.

[0030] The fluid channel 140 has a fluid inlet 226 and fluid outlets 261 and 262. The fluid outlets 261 and 262 are arranged on the shell exhaust seat end surface 202 and can be swept by the exhaust end of the male rotor 102 or the female rotor 103, so as to be connected with the compression chamber 105. The fluid inlet 226 is arranged on the outer surface of the exhaust seat, and the fluid inlet 226 is connected with an external pipeline, and the external pipeline is used to connect the economizer system, so that the economizer system can replenish refrigerant into the compression chamber 105 through the fluid channel 140.

[0031] In another embodiment of the present application, the fluid outlets 261 and 262 may also be disposed on the inner wall of the housing rotor seat 183 and may be communicated with the compression chamber 105 .

[0032] like Figure 2C As shown, the fluid channel 140 includes an inlet channel 241, a buffer chamber 208, and a pair of outlet channels 231 and 232. The buffer chamber 208 is located between the inner wall 111 and the outer wall 112 of the shell 101, and is connected to the outside of the compressor through the inlet channel 241, and is connected to the compression chamber 105 through a pair of outlet channels 231 and 232. The buffer chamber 208 is closed except for the part connected to the inlet channel 241, the outlet channels 231 and 232. In one embodiment of the present application, the buffer chamber 208 is roughly cylindrical and extends along the width direction of the compressor (i.e., perpendicular to the axial direction of the screw rotor 110). In other embodiments of the present 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, and no additional corresponding installation space is required. The buffer cavity 208 has a certain volume, and the average area of ​​the cross section (i.e., the radial cross section) of the buffer cavity 208 is greater than 5 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 shell 101 toward the inside 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. In other words, the first end 292 of the inlet channel 241 is inserted into the inside 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 narrowed section 271 has a lower opening 274 located near the first end 292 and an upper opening 275 located near the transition section 272 . The area of ​​the lower opening 274 is smaller than that of the upper opening 275 .

[0035] In one embodiment of the present application, the diameter of the constricted section 271 gradually decreases in the direction from the fluid inlet 226 to the first end 292, forming a truncated cone. 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, and the transition portion 278 is located in a space surrounded by a transition section inner wall 299 of the transition section 272. The transition portion 278 includes a transition portion inner wall 288 and a transition portion outer wall 289, and the transition portion inner wall 288 is connected to the inner wall of the inlet section 273 and extends smoothly toward the first end 292. The diameter of the transition portion inner wall 288 is substantially the same as the diameter of the inlet section 273. The cross-sectional area of ​​the transition portion 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 transition portion inner wall 288 and the upper opening 275. In one embodiment of the present application, the cross-sectional area of ​​the transition portion inner wall 288 gradually decreases in the extending direction from the outer wall 112 of the shell toward the first end 292 of the inlet channel 241. There is a gap between the transition portion outer wall 289 and the transition section inner wall 299, and the cross-sectional area of ​​the transition portion outer wall 289 gradually decreases in the extending direction from the outer wall 112 of the shell toward the first end 292 of the inlet channel 241. In other words, in the extending direction from the outer wall 112 of the shell toward the first end 292 of the inlet channel 241, the gap between the transition portion outer wall 289 and the transition section inner wall 299 gradually increases. A transition space 286 is formed between the transition portion outer wall 289 and the transition section inner wall 299.

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

[0037] One end of the outlet channel 231 has an outlet channel inlet 257, and the other end has a fluid outlet 261. The outlet channel 231 is connected to the buffer chamber 208 through the outlet channel inlet 257, and is connected 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, one end of the outlet channel 232 has an outlet channel inlet 258 and the other end has a fluid outlet 262. The outlet channel 231 is connected to the buffer chamber 208 through the outlet channel inlet 258, and is connected to the compression chamber 105 through the fluid outlet 262. The extension direction of the outlet channel guide section 237 of the outlet channel 232 and the extension direction of the inlet channel guide section 236 are at an angle between 80° and 100°.

[0039] In one embodiment of the present application, in the height direction H of the compressor, the buffer chamber 208 has a matching portion 281 located at the bottom. The inlet channel 241 extends from the outer wall 112 of the housing 101 to the matching portion 281 of the buffer chamber 208, and has a spacing with the bottom of the buffer chamber 208. In one embodiment of the present application, the spacing between the matching 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 the present application, the spacing between the matching 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] The 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, the outlet channel inlets 258 and 257 are respectively located on both sides of the inlet channel 241, and there is a spacing between the inlet channel 241. The outlet channels 231 and 232 respectively have front sections 247 and 248 connected to the outlet channel inlets 257 and 258. In one embodiment of the present application, the extension direction of the front sections 247 and 248 is roughly parallel to the extension direction of the inlet channel 241. The 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 the present application, the number of outlet channels can be one or more, and the fluid outlet position of each outlet channel is different, and they are respectively connected to different positions of the compression chamber. The average cross-sectional area of ​​the buffer chamber 208 is greater than 5 times the average cross-sectional area of ​​the outlet channel inlets 258 and 257.

[0041] In the present application, the fluid channel 140 connects the compression chamber 105 with the pipeline of the economizer, and a valve device is provided on the pipeline of the economizer to prevent the refrigerant and lubricating oil from flowing into the economizer. The fluid in the fluid outlets 261 and 262 can enter the compression chamber 105. The fluid pressure at the fluid outlets 261 and 262 fluctuates periodically (referred to as "pressure pulsation") as the screw rotor rotates. The fluid pressure pulsation at the fluid outlets 261 and 262 enters the buffer chamber 208 through the outlet channels 231 and 232. The buffer chamber 208 has a large cross-sectional area and volume, and the pressure pulsation of the fluid is buffered in the buffer chamber 208, and the pulsation amplitude is reduced. The inlet channel 241 has a tapered section 271 and a transition section 272. When the fluid pressure pulsation in the buffer chamber 208 encounters the outer wall of the inlet channel 241, part of the pulsation energy will be reflected (reflected back to the sound source), and then the pressure pulsation enters the tapered section 271 from the buffer chamber 208, not only a 90-degree turn in the flow direction but also a sudden contraction in the flow cross-sectional area, which will further produce reflection and diffraction of part of the pulsation energy; next, the pressure pulsation in the tapered section 271 enters the transition section 272, and part of the fluid pressure pulsation energy directly enters the channel surrounded by the inner wall 288 of the transition portion, which will again produce energy reflection due to the sudden contraction of the cross-section, and the rest first enters the transition space 286 formed between the outer wall 289 of the transition portion and the inner wall 299 of the transition section. After being reflected by the wall of this space, part of it will be reflected and diffracted when it enters the channel surrounded by the inner wall 299 of the transition section. In the process of the fluid pressure pulsation energy reaching the fluid inlet 226 from the buffer chamber 208 via the constricted section 271 and the transition section 272 , the pulsation energy is reflected and diffracted multiple times, thereby effectively reducing the fluctuation amplitude of the fluid pressure pulsation.

[0042] In this embodiment, the fluid at the fluid outlets 261 and 262 has a certain pressure fluctuation. The structure of the buffer chamber 208 and the inlet channel 241 can well attenuate the pressure pulsation amplitude of the fluid propagating upstream through this path from the fluid outlets 261 and 262, so that the pressure fluctuation at the fluid inlet 226 is significantly reduced. That is, the pulsation amplitude of the fluid pressure pulsation at the fluid outlets 261 and 262 is continuously attenuated during the process of being transmitted to the fluid inlet 226, so that the fluid pressure pulsation at the fluid inlet 226 is small (effectively suppressed). The fluid inlet 226 is connected to the economizer pipeline. The small pressure pulsation of the fluid inlet 226 makes the vibration of the external economizer pipeline small, and it is not easy to loosen or other adverse conditions, which can effectively ensure the operating reliability of the economizer structure system.

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

[0044] As shown in 3, Figures 2A-2D Similar to the embodiment shown, the inlet channel 341 extends from the outer wall 112 of the shell 101 toward the inside 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. In other words, 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 close to the second end 393, and the flared section 372 is close to the first end 392.

[0045] In one embodiment of the present application, the diameter of the constricted section 371 gradually decreases in the direction from the fluid inlet 326 to the first end 392. The diameter of the expanded section 372 gradually increases in the direction from the fluid inlet 326 to the first end 392. The expanded section 372 is smoothly connected to the end of the constricted section 371 away from the fluid inlet 326, so that the constricted section 371 and the expanded section 372 together form a shape that is thin in the middle and thick at both ends. During the flow of the 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, and the fluid smoothly passes through the constricted opening 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 similar to Figure 2A The embodiment shown in the figure has the same structure, and the angle between the extension direction of the buffer chamber 308 and the axial direction of the screw rotor 110 is between 80° and 100°. The average cross-sectional area of ​​the buffer chamber 308 is greater than 5 times the average cross-sectional area of ​​the inlet channel 341. The buffer chamber 308 has a matching portion 381 located at the bottom. The spacing between the fluid outlet on the first end 392 of the inlet channel 341 and the matching portion 381 is 0.8-1.2 times the diameter of the fluid inlet 326 of the inlet channel 341.

[0047] In this embodiment, the number of outlet channels is 4, including outlet channels 331, 332, 333 and 334. Each outlet channel is connected to a different position of the compression chamber 105, and can replenish air to different positions of the compression chamber 105. The average cross-sectional area of ​​the buffer chamber 308 is greater than 5 times the average cross-sectional area of ​​the outlet channel inlet. In the process of fluid pressure pulsation entering the buffer chamber 308 from the outlet channels 331, 332, 333 and 334, and entering the inlet channel 341 from the buffer chamber 308, in addition to the attenuation effect of the buffer chamber on the pressure pulsation, accompanied by the continuous change of the flow direction and the flow cross section, the pressure pulsation is also reflected and diffracted multiple times during the propagation process, and the pressure pulsation amplitude transmitted upstream is continuously reduced. The buffer chamber 308, outlet channels 331, 332, 333 and 334 and the inlet channel 341 in this embodiment together constitute a pulsation attenuation structure that reduces the fluid pressure in the air replenishment channel, thereby effectively reducing the vibration of the external economizer pipeline connected to the air replenishment channel.

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

[0049] As shown in 4, Figures 2A-2D Similar to the embodiment shown, the inlet channel 441 extends from the outer wall 112 of the shell 101 toward the inside 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 in the middle of the buffer chamber 408 in the height direction. In other words, 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 constricted section 471.

[0050] In one embodiment of the present application, the diameter of the constricted section 471 gradually decreases 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. During the flow of the fluid from the second end 493 of the inlet channel 441 to the first end 492, the flow cross-sectional area of ​​the inlet channel 441 is continuously reduced to increase the degree of sudden contraction of the flow cross-sectional area when the 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 similar to Figure 2A The embodiment shown in the figure has the same structure, and the angle between the extension 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 spacing between the fluid outlet on the first end 492 of the inlet channel 441 and the matching portion 481 is 0.8-1.2 times the diameter of the fluid inlet 426 of the inlet channel 441.

[0052] In this embodiment, the number of outlet channels is 4, including outlet channels 431, 432, 433 and 434. Each outlet channel is connected to a different position of the compression chamber 105, and can replenish air to different positions of the compression chamber 105. In the process of fluid pressure pulsation entering the buffer chamber 408 from the outlet channels 431, 432, 433 and 434, and entering the inlet channel 441 from the buffer chamber 408, in addition to the attenuation effect of the buffer chamber 408 on the pressure pulsation, accompanied by the continuous change of the flow direction and the flow cross-section, the pressure pulsation also undergoes multiple reflections and diffractions during the propagation process, and the pressure pulsation amplitude transmitted upstream is continuously reduced. The buffer chamber 408, the outlet channel and the inlet channel 441 in this embodiment together constitute an attenuation structure that reduces the fluid pressure pulsation in the air replenishment channel, thereby effectively reducing the vibration of the external economizer pipeline connected to the air replenishment channel.

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

[0054] As shown in 5, Figures 2A-2DSimilar to the embodiment shown, the inlet channel 541 extends from the outer wall 112 of the shell 101 toward the inside 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 in the middle of the buffer chamber 508 in the height direction. In other words, 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 the present application, the diameter of the constricted section 571 gradually decreases in the direction from the fluid inlet 526 to the first end 592. The outlet section 572 is connected to the constricted section 571 and is located near the first end 592. The outlet section 572 has an upper opening 577 connected to the constricted section and a lower opening 578 located at the first end 592. The upper opening is smaller than the lower opening. Along the extension direction of the inlet channel 541, the inner wall of the outlet section 572 is arc-shaped. During the flow of the 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 is continuously reduced in the constricted section 571, and changes smoothly in the outlet section 572, which can change the flow state of the fluid and reduce the flow resistance of the invigorating fluid.

[0056] In this embodiment, the structure of the buffer cavity 508 is similar to Figure 2A The embodiment shown in the figure has the same structure, and the angle between the extension direction of the buffer chamber 508 and the axial direction of the screw rotor 110 is between 80° and 100°. The average cross-sectional area of ​​the buffer chamber 508 is greater than 5 times the average cross-sectional area of ​​the inlet channel 541. The spacing between the fluid outlet on the first end 592 of the inlet channel 541 and the matching portion 581 is 0.8-1.2 times the diameter of the fluid inlet 526 of the inlet channel 541.

[0057] In this embodiment, the number of outlet channels is 4, including outlet channels 531, 532, 533 and 534 respectively. Each outlet channel is connected to a different position of the compression chamber 105, and can replenish air to different positions of the compression chamber 105. The average cross-sectional area of ​​the buffer chamber 508 is 5 times greater than the average cross-sectional area of ​​the inlet of the outlet channel. In the process of fluid pressure pulsation entering the buffer chamber 508 from the outlet channel and entering the inlet channel 541 from the buffer chamber 508, in addition to the attenuation effect of the buffer chamber 508 on the pressure pulsation energy, accompanied by the continuous change of the flow direction and the flow cross-sectional area, the pressure pulsation also undergoes multiple reflections and diffractions during the propagation process, and the amplitude of the pressure pulsation energy transmitted upstream is continuously reduced. The buffer chamber 508, the outlet channel and the inlet channel 541 in this embodiment together constitute an attenuation structure that reduces the fluid pressure pulsation in the air replenishment channel, thereby effectively reducing the vibration of the external economizer pipeline connected to the air replenishment channel.

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

[0059] As shown in 6, Figures 2A-2D Similar to the embodiment shown, the inlet channel 641 extends from the outer wall 112 of the shell 101 toward the inside of the buffer chamber 608, and extends beyond the inner wall of the buffer chamber 608 along the height direction of the compressor. The portion of the inlet channel 641 located inside the buffer chamber 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 in the middle of the buffer chamber 608 in the height direction. In other words, the first end 692 of the inlet channel 641 is inserted into the interior of the buffer chamber 608. The inner wall of the inlet channel 641 extends evenly and smoothly, so that the cross-sectional area of ​​the inlet channel 641 is approximately equal everywhere.

[0060] In this embodiment, the structure of the buffer cavity 608 is similar to Figure 2A The embodiment shown in the figure has the same structure, and the angle between the extension direction of the buffer chamber 608 and the axial direction of the screw rotor 110 is between 80° and 100°. The average cross-sectional area of ​​the buffer chamber 608 is greater than 5 times the average cross-sectional area of ​​the inlet channel 541. The spacing between the fluid outlet on the first end 692 of the inlet channel 641 and the matching portion 681 is 0.8-1.2 times the diameter of the fluid inlet 626 of the inlet channel 641.

[0061] In this embodiment, in the process of fluid pressure pulsation energy entering the buffer chamber 608 from the outlet channel and entering the inlet channel 541 from the buffer chamber 608, in addition to the attenuation effect of the buffer chamber on the pressure pulsation energy, along with the continuous change of the flow direction and the flow cross-sectional area, the pressure pulsation also undergoes multiple reflections and diffractions during the propagation process, and the magnitude of the pressure pulsation energy propagating upstream is continuously reduced. The buffer chamber 608, the outlet channel and the inlet channel 641 in this embodiment together constitute an attenuation structure for reducing 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 the present disclosure has been described in conjunction with the examples of the embodiments summarized above, various alternatives, modifications, variations, improvements and / or substantially equivalent solutions, whether known or currently or foreseeable in the near future, may be apparent to those of ordinary skill in the art. In addition, the technical effects and / or technical problems described in this specification are exemplary rather than restrictive; so the disclosure in this specification may be used to solve other technical problems and have other technical effects. Therefore, the examples of the embodiments of the present disclosure set out above are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to include all known or earlier developed alternatives, modifications, variations, improvements and / or substantially equivalent solutions.

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 shell and forms a compression chamber with the inner wall of the shell; A buffer cavity, the buffer cavity is arranged between the inner wall and the outer wall of the shell; at least one outlet channel, a first end of the outlet channel being in communication with the buffer chamber, and a second end of the outlet channel being in communication with the compression chamber through an inner wall of the shell; An inlet channel, wherein a first end of the inlet channel is communicated with the buffer cavity and extends beyond the inner wall of the buffer cavity to the inside of the buffer cavity, and a second end of the inlet channel passes through the outer wall of the shell and is communicated with the outside of the shell.

2. The compressor according to claim 1, characterized in that: The included angle between the extension direction of the buffer chamber and the axial direction of the screw rotor is between 80° and 100°.

3. The compressor according to 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 according to 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 according to claim 1, characterized in that: The inlet passage comprises a constricted section, and the cross-sectional area of ​​the inner wall of the constricted section gradually decreases in the extending direction from the outer wall of the shell toward the buffer cavity.

6. The compressor according to claim 5, characterized in that: The inlet channel also includes a flared section, which is connected to the narrowed section. Compared with the narrowed section which is farther away from the outer wall of the shell, the cross-sectional area of ​​the inner wall of the flared section gradually increases in the extension direction from the outer wall of the shell toward the buffer cavity.

7. The compressor according to claim 5, characterized in that: The inlet channel also includes a transition portion, which is adjacent to the necking section and closer to the outer wall of the shell, and the transition portion includes a transition portion inner wall and a transition portion outer wall, wherein the cross-sectional area of ​​the transition portion outer wall gradually decreases in the extension direction from the outer wall of the shell toward the buffer cavity, and the cross-sectional area of ​​the transition portion inner wall is smaller than the maximum cross-sectional area of ​​the necking section; the cross-sectional area of ​​the transition portion inner wall gradually decreases in the extension direction from the outer wall of the shell toward the buffer cavity.

8. The compressor according to claim 1, characterized in that: The at least one outlet channel includes at least two outlet channels, and the at least two outlet channels are connected to different positions of the compression chamber.

9. The compressor according to 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 matching portion corresponding to the inlet channel outlet, and the spacing between the matching portion 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 cavity is greater than 5 times the average cross-sectional area of ​​the inlet channel.

10. The compressor according to claim 1, characterized in that: The inlet passage is in communication with an external pipeline of the economizer.

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