Compressors and refrigeration systems

Abstract

The present application provides a compressor and a refrigeration system, including a housing, a pair of rotors and a slide valve, wherein the pair of rotors can form a compression chamber and have an exhaust end face; the slide valve has a slide valve exhaust port, and the slide valve exhaust port can connect the compression chamber with the compressor exhaust port; the housing has a housing mating surface arranged facing the exhaust end face, the housing mating surface has a rotor projection area, the rotor projection area is a projection area formed on the housing mating surface along the axial direction during the rotation of a pair of rotors, the rotor projection area is configured to be able to close the compression chamber, a main exhaust port and at least one auxiliary exhaust port that can be opened and closed are provided in the rotor projection area, the compression chamber can be connected with the compressor exhaust port through the main exhaust port, the at least one auxiliary exhaust port is configured to be able to be opened and closed, and when the at least one auxiliary exhaust port is opened, the compression chamber can be connected with the compressor exhaust port through the at least one auxiliary exhaust port. The exhaust pressure fluctuation of the compressor in the present application is small.

Description

Technical Field

[0001] The present application provides a compressor, in particular a twin-screw compressor used in a refrigeration system. 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 oil supply system, which provides lubricating oil (or other media) to the compressor to ensure the smooth operation of the male and female rotors and other components inside the twin-screw compressor. Summary of the invention

[0003] The present application provides a twin-screw compressor with lower noise and higher energy efficiency. The compressor in the present application includes: a shell; a pair of rotors, the pair of rotors are arranged in the shell, the pair of rotors can form a compression chamber, the pair of rotors have an intake end and an exhaust end, and an exhaust end face located at the exhaust end; a sliding valve, the sliding valve is arranged in the shell, the sliding valve has a sliding valve head end and a sliding valve tail end, in the axial direction of the pair of rotors, the sliding valve head end and the sliding valve tail end are arranged in the same direction as the intake end and the exhaust end of the pair of rotors, and the sliding valve is configured to be able to reciprocate along the axial direction of the pair of rotors, the sliding valve tail end is provided with a sliding valve exhaust port, and the sliding valve exhaust port can connect the compression chamber with the compressor exhaust port; its In the embodiment, the shell has a shell mating surface arranged facing the exhaust end surface, the shell mating surface has a rotor projection area, the rotor projection area is a projection area formed on the shell mating surface along the axial direction during the rotation of the pair of rotors, the rotor projection area is configured to be able to close the compression chamber, a main exhaust port and at least one auxiliary exhaust port that can be opened and closed are provided in the rotor projection area, the compression chamber can be connected to the compressor exhaust port through the main exhaust port, the at least one auxiliary exhaust port is configured to be able to be opened and closed, and when the at least one auxiliary exhaust port is opened, the compression chamber can be connected to the compressor exhaust port through the at least one auxiliary exhaust port.

[0004] In the compressor as described above, the at least one auxiliary exhaust port is configured to be opened when the operation of the compressor reaches a predetermined condition.

[0005] For the compressor as described above, the predetermined condition is that the operating volume ratio of the compressor matches the designed volume ratio, and the load is between 70% and 100%.

[0006] The compressor as described above further comprises a blocking member, wherein the blocking member is movably disposed in the housing, and the blocking member can be moved into and out of the at least one auxiliary exhaust port to open and close the at least one auxiliary exhaust port.

[0007] In the compressor as described above, a blocking member hydraulic chamber is provided in the housing, the blocking member is arranged in the blocking member hydraulic chamber, and the pressure in the blocking member hydraulic chamber can be adjusted so that the blocking member can move in the blocking member hydraulic chamber.

[0008] In the compressor as described above, the at least one auxiliary exhaust port extends continuously with the main exhaust port.

[0009] In the compressor as described above, the shape of at least a portion of the edge of the at least one auxiliary exhaust port is consistent with the shape of the profile of the teeth of the pair of rotors.

[0010] In the compressor as described above, the blocking member is configured to move along the axial direction of the pair of rotors.

[0011] According to the compressor described above, the blocking member is configured to move in a radial direction parallel to the pair of rotors, thereby being able to gradually open and close the auxiliary exhaust port.

[0012] The present application also provides a refrigeration system, comprising the compressor as described above; and a high-pressure connecting channel and a low-pressure connecting channel, wherein the high-pressure connecting channel is provided with a first valve, and the low-pressure connecting channel is provided with a second valve, the high-pressure connecting channel connects the hydraulic chamber of the blocking member with the high-pressure side of the refrigerant system, and the low-pressure connecting channel connects the hydraulic chamber of the blocking member with the low-pressure side of the refrigeration system, and the refrigeration system can adjust the pressure in the hydraulic chamber of the blocking member by adjusting the first valve and the second valve.

[0013] As in the above refrigeration system, the compressor is further provided with a spring, which is at least partially located in the hydraulic chamber of the blocking member and is configured to provide auxiliary supporting force to the blocking member when the at least one auxiliary exhaust port is closed.

[0014] The compressor in the present application is provided with an openable auxiliary exhaust port, which can increase the exhaust port area when the rotor just rotates to connect the compression chamber with the sliding valve exhaust port, thereby reducing the exhaust pressure fluctuation of the compressor, further reducing the noise of the compressor and improving energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A is a three-dimensional diagram of the compressor in the present application;

[0016] Figure 1B yes Figure 1A A front view of the compressor;

[0017] Figure 1C yes Figure 1B Axial section view of the middle compressor along line AA;

[0018] Figure 1D yes Figure 1A A top view of the compressor;

[0019] Figure 1E yes Figure 1D Axial section view of the middle compressor along line BB;

[0020] Figure 1F yes Figure 1B A radial cross-sectional view of the compressor taken along line CC;

[0021] Figure 1G yes Figure 1E A three-dimensional view of the middle slide valve;

[0022] Figure 2 is a schematic block diagram of a refrigeration system;

[0023] Figure 3A is a perspective view of the second portion of the housing of the first embodiment in FIG. 1 ;

[0024] Figure 3B yes Figure 3A an axial view of the second portion of the middle housing;

[0025] Figure 3C is a three-dimensional diagram of the blocking member;

[0026] Figure 3D yes Figure 3A a cross-sectional view of the second portion of the middle housing;

[0027] Figure 3E yes Figure 3A a cross-sectional view of the second portion of the middle housing and the blocking member;

[0028] Figure 4A is a three-dimensional diagram of the second part of the housing and the blocking member of the second embodiment of the present application;

[0029] Figure 4B yes Figure 4A an axial view of the second portion of the middle housing;

[0030] Figure 4C yes Figure 4A Schematic diagram of the blocking member;

[0031] Figure 4D yes Figure 4A a cross-sectional view of the second portion of the middle housing;

[0032] Figure 4E yes Figure 4Aa cross-sectional view of the second portion of the middle housing and the blocking member;

[0033] Figure 5A is a three-dimensional diagram of the second part of the housing of the third embodiment of the present application;

[0034] Figure 5B yes Figure 5A an axial view of the second portion of the middle housing;

[0035] Figure 5C yes Figure 5A A perspective view of the middle blocking member;

[0036] Figure 5D yes Figure 5A a cross-sectional view of the second portion of the middle housing and the blocking member;

[0037] Fig. 6A is a three-dimensional diagram of the second part of the housing of the fourth embodiment of the present application;

[0038] Figure 6B yes Fig. 6A an axial view of the second portion of the middle housing;

[0039] Figure 6C yes Fig. 6A A perspective view of the middle blocking member;

[0040] Fig.6D yes Fig. 6A A cross-sectional view of the second portion of the middle housing and the blocking member. DETAILED DESCRIPTION

[0041] 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.

[0042] Ordinal numbers such as "first" and "second" used in this application are only used for distinction and identification, and do not have any other meanings. If not specifically specified, they do not indicate a specific order or have a specific association. For example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0043] Figure 1A It is a stereoscopic view of the compressor in the present application, used to illustrate the external structure of the compressor. Figure 1B yes Figure 1A Front view of the compressor. Figure 1C yes Figure 1B Axial section view of the compressor along line AA. Figure 1D yes Figure 1A A top view of the compressor. Figure 1E yes Figure 1D The axial section view of the compressor along the BB line. Figure 1F yes Figure 1B The radial cross-section view of the compressor along the CC line, Figure 1G yes Figure 1E A three-dimensional view of the middle slide valve. Figures 1A-1G The positional relationship between the compressor exhaust port, the slide valve and a pair of rotors is shown.

[0044] like Figures 1A-1G As shown, the screw compressor 100 includes a housing 101 and a pair of rotors 110 and a slide valve 108 arranged in the rotor housing 101. The pair of rotors 110 includes a male rotor 102 and a female rotor 103 that mesh with each other, and the male rotor 102 and the female rotor 103 can be driven to rotate. The male rotor 102 has a male rotor body 120 and male rotor connecting parts 128 and 129, and the male rotor connecting parts 128 and 129 are located at both ends of the male rotor body 120 in the axial direction, thereby forming the axis of the male rotor 102. The male rotor connecting part 129 is pivotally connected to the housing 101, and the male rotor connecting part 128 is transmission-connected to the motor 140, so that the motor 140 can drive the male rotor 102 to rotate relative to the housing 101 around the axis of the male rotor 102. Similarly, the female rotor 103 has a female rotor body 130 and female rotor connecting parts 138 and 139, and the female rotor connecting part 138 is located at both ends of the female rotor body 130 in the axial direction, thereby forming the axis of the female rotor. The female rotor connecting part 138 and the female rotor connecting part 139 are respectively pivotally connected to the housing 101, and the female rotor 103 can be driven by the male rotor 102 to rotate relative to the housing 101 around the axis of the female rotor 103. The outer side of the male rotor body 120 has a plurality of spiral teeth 168 and spiral grooves formed between adjacent spiral teeth 168, and the outer side of the female rotor body 130 also has a plurality of spiral teeth 169 and spiral grooves formed between adjacent spiral teeth 169. The teeth 168 and grooves of the male rotor body 120 and the grooves and teeth 169 of the female rotor body 130 form a mutually meshing structure, so that the male rotor body 120, the female rotor body 130 and the housing 101 together form a compression chamber 105. The housing 101 has a compressor air intake port 141 and a compressor air discharge port 142 . The refrigerant enters the compressor from the compressor air intake port 141 and is discharged from the compressor air discharge port 142 after being compressed.

[0045] Along the axial direction of the pair of rotors 110, the pair of rotors 110 has an intake end 121 and an exhaust end 122. The refrigerant gas is sucked into the compression chamber 105 at the intake end 121, and gradually moves toward the exhaust end 122 as the pair of rotors 110 rotate. At the same time, the volume of the compression chamber 105 gradually decreases as the pair of rotors 110 rotates, and the gas in the compression chamber 105 is gradually compressed. The compressed gas is discharged from the exhaust end 122.

[0046] See also Figure 1E , Figure 1F and Figure 1G The slide valve 108 is located below the pair of rotors 110 and can reciprocate along the axial direction of the pair of rotors 110. The slide valve 108 includes a slide valve body 186 and a slide valve connection portion 187. The slide valve body 186 has a slide valve head end 181 and a slide valve tail end 182. In the axial direction of the pair of rotors 110, the slide valve head end 181 and the slide valve tail end 182 are arranged in the same direction as the suction end 121 and the exhaust end 122 of the pair of rotors 110. In the length direction of the slide valve 108, the slide valve 108 includes a working surface 123 for closing the compression chamber 105 together with the housing 101, and the slide valve tail end 182 has a recess 183 that is recessed from the working surface 123 to the inside of the slide valve, and the recess 183 forms a slide valve exhaust port 185.

[0047] The shape of the working surface 123 of the slide valve matches the shape of the pair of rotors 110. Looking down from the top of the working surface 123 of the slide valve, the concave portion 183 of the slide valve 108 is a "V" shape that gradually increases from the center to the two sides. The slide valve connection portion 187 is connected to the slide valve tail end 182, and the radial cross-sectional area of ​​the slide valve connection portion 187 is smaller than the radial cross-sectional area of ​​the slide valve body 186. The slide valve connection portion 187 can be connected to the slide valve driving device through a connecting rod, so that the slide valve 108 can be driven and moved by the slide valve driving device.

[0048] The slide valve 108 can move to different positions along the axis direction of the pair of rotors 110, so that the working surface 123 blocks or closes different parts of the pair of rotors 110, thereby correspondingly adjusting the internal volume ratio Vi or the load of the screw compressor 100. When the slide valve 108 moves to a certain position, the slide valve exhaust port 185 can connect the compression chamber 105 with the compressor exhaust port 142.

[0049] like Figure 1B and 1CAs shown, the housing 101 includes a first housing portion 151 and a second housing portion 152, and the first housing portion 151 and the second housing portion 152 are connected to each other. The compressor suction port 141 is arranged on the first housing portion 151, and the compressor exhaust port 142 is arranged on the second housing portion 152. The main body parts of a pair of rotors 110 (i.e., the male rotor body 120 and the female rotor body 130) are located in the first housing portion 151. The slide valve 108 can move in the first housing portion 151 and the second housing portion 152. The exhaust ends 122 of the pair of rotors 110 have an exhaust end face 125, and the second housing portion 152 has a housing mating face 135, and the exhaust end face 125 is arranged facing the housing mating face 135 and is adjacent to the housing mating face 135.

[0050] Figure 2 is a schematic block diagram of a refrigeration system. In one embodiment of the present application, a compressor is applied to a refrigeration system, such as Figure 2 As shown, the refrigeration system 200 includes a compressor 100, a condenser 220, a throttling device 240 and an evaporator 230, which are connected by pipelines to form a refrigerant circulation loop, and the loop is filled with refrigerant. Figure 2 As shown in the direction of the arrow in , the refrigerant flows through the compressor 100, the condenser 220, the throttling device 240 and the evaporator 230 in sequence, and enters the compressor 100 again. During the refrigeration process, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 100 exchanges heat with the ambient medium in the condenser 220, releases heat and is condensed into liquid refrigerant; the throttling device 240 throttles the high-pressure liquid refrigerant from the condenser 220 to reduce its pressure; the low-pressure refrigerant exchanges heat with the cooled object in the evaporator 230, absorbs the heat of the cooled object and vaporizes; the refrigerant vapor generated by vaporization is sucked into the compressor 100, and is discharged at high pressure after being compressed, forming a cycle. The refrigeration system includes a high-pressure side 211 between the compressor outlet and the throttling device inlet and a low-pressure side 212 between the throttling device outlet and the compressor inlet.

[0051] Figure 3A is a perspective view of the second housing portion 152 of the first embodiment in FIG. 1 , Figure 3B yes Figure 3A An axial view of the second portion 152 of the middle housing, Figure 3C is a three-dimensional diagram of the blocking member, Figure 3D yes Figure 3A A cross-sectional view of the second portion 152 of the middle housing, Figure 3E yes Figure 3A A cross-sectional view of the second housing portion 152 and the blocking member, Figures 3A-3E The matching relationship between the second part of the housing and the blocking member is shown.

[0052] like Figure 3A-3EAs shown, the second part 152 of the housing has a substantially planar housing mating surface 135 on one side facing the first part 151 of the housing. The second part 152 of the housing has an exhaust cavity 301, and a pair of rotor shaft mounting channels 304 and 305. The pair of rotor shaft mounting channels 304 and 305 are used to mount the male rotor connection portion 129 and the female rotor connection portion 139, respectively, and the pair of rotor shaft mounting channels 304 and 305 extend through the housing mating surface 135 to form shaft mounting holes 314 and 315. One end of the exhaust cavity 301 extends through the housing mating surface 135 to form a mating surface opening 320, and the other end extends through the outer surface of the second part 152 of the housing to form a connection with the compressor exhaust port 142. Thus, the mating surface opening 320 is connected with the compressor exhaust port 142. The housing mating surface 135 has a rotor projection area 308, which is a projection area formed on the housing mating surface 135 along the axial direction of the pair of rotors 110 during the rotation of the pair of rotors 110. The rotor projection area 308 is roughly in the shape of an "8" and is located around the shaft mounting holes 314 and 315. During the rotation of the pair of rotors 110, the range swept by the pair of exhaust end faces 125 on the housing mating surface 135 is within the range defined by the rotor projection area 308. The rotor projection area 308 has a sealing area 310 and an opening area 328, wherein the overlapping portion of the rotor projection area 308 and the mating surface opening 320 forms the opening area 328, and the remaining portion of the rotor projection area 308 forms the sealing area 310. The sealing area 310 can seal the end of the compression chamber 105 so that the compression chamber 105 can form a sealed space. During the rotation of a pair of rotors, when the end of the compression chamber 105 is aligned with the sealing area 310, the compression chamber 105 is disconnected from the exhaust chamber 301, and the refrigerant gas in the compression chamber 105 can be compressed; when the end of the compression chamber 105 is staggered from the sealing area 310, the compression chamber 105 can be connected with the exhaust chamber 301, and the gas in the compression chamber 105 can be discharged. The mating surface opening 320 also includes a slide valve installation area 325, which is located on the side of the opening area 328 away from the shaft mounting holes 314 and 315 and connected to the opening area 328. The shape of the slide valve installation area 325 is consistent with the shape of the projection area of ​​the slide valve 108 on the housing mating surface 135 along the axial direction. The slide valve 108 can enter the slide valve installation area 325 and can move in the exhaust chamber 301.

[0053] The opening area 328 has a main exhaust port 311 and auxiliary exhaust ports 312 and 313 on both sides of the main exhaust port 311. The auxiliary exhaust port 312 is located on a side close to the shaft mounting hole 314, and the auxiliary exhaust ports 313 are respectively located on a side close to the shaft mounting hole 315. The main exhaust port 311 and the auxiliary exhaust ports 312 and 313 extend continuously. The main exhaust port 311 is configured to be always open to communicate with the exhaust chamber 301; the auxiliary exhaust ports 312 and 313 are configured to be selectively opened and closed, so as to communicate or disconnect with the exhaust chamber 301.

[0054] In the rotation direction of the male rotor 102, the auxiliary exhaust port 312 has a first side edge 316 and a second side edge 327, and the shapes of the first side edge 316 and the second side edge 327 are consistent with the shape of the profile of the male rotor 102; similarly, in the rotation direction of the female rotor 103, the auxiliary exhaust port 313 has a first side edge 329 and a second side edge 331, and the shapes of the first side edge 329 and the second side edge 331 are consistent with the shape of the profile of the female rotor 103. The shape design of the auxiliary exhaust ports 312 and 313 enables the exhaust pressure to be quickly adjusted when the male rotor 102 and the female rotor 103 rotate past the first edge or the second edge of the auxiliary exhaust ports 312 and 313, respectively.

[0055] like Figure 3C-3E As shown, the compressor 100 also includes a pair of blocking members 318 and 319, which are respectively used to cooperate with the auxiliary exhaust ports 312 and 313 to open and close the auxiliary exhaust ports 312 and 313. The blocking members 318 and 319 have similar structures, and the structure of the blocking member is introduced below by taking the blocking member 318 as an example. The blocking member 318 includes a sealing portion 361 and a rod portion 362. The sealing portion 361 is roughly flat and has an upper surface 371 and a lower surface 372, and the rod portion 362 is connected to the lower surface 372. The rod portion 362 is roughly cylindrical, and the radial cross-sectional area of ​​the rod portion 362 is smaller than the area of ​​the lower surface 372. The shape of the upper surface 371 of the sealing portion 361 matches the shape of the corresponding auxiliary exhaust port 312. The blocking members 319 and 318 have similar structures, except that the shape of the upper surface of the sealing portion of the blocking member 319 matches the shape of the auxiliary exhaust port 313.

[0056] A pair of blocking member installation channels 381 and 382 are also provided in the second portion 152 of the housing, which are used to install blocking members 318 and 319, respectively. The blocking member installation channels 381 and 382 are located on both sides of the exhaust chamber 301 and extend in a direction substantially perpendicular to the housing mating surface 135. The blocking member installation channel 381 includes a front section 383 and a rear section 385. The front section 383 is a uniform columnar shape. The shape of each cross section of the front section 383 matches the shape of the auxiliary exhaust port 312. The length of the front section 383 in the extending direction of the blocking member installation channel 381 is greater than the thickness of the sealing portion 361 of the blocking member 318. The shape of the cross section of the rear section 385 matches the shape of the cross section of the rod portion 362. The length of the rear section 385 in the extending direction of the blocking member installation channel 381 is greater than the length of the rod portion 362 of the blocking member 318.

[0057] When the blocking member 318 is installed in the blocking member installation channel 381, at least a portion of the rod portion 362 of the blocking member 318 is located in the rear section 385, and the sealing portion 361 of the blocking member 318 is located in the front section 383, and the blocking member 318 can move in the blocking member installation channel 381 along the extension direction of the blocking member installation channel 381. (See Figure 3E (shown)

[0058] The front section 383 has a top 395, a bottom 396, and a side section 397 connecting the top 395 and the bottom 396, and the side section 397 includes a closed portion 398 and an opening portion 399, wherein the closed portion 398 is formed by the inner wall of the second part 152 of the housing, and the opening portion 399 is located on a side close to the main exhaust port 311 and communicates with the exhaust chamber 301. That is, the opening portion 399 extends continuously with the exhaust chamber 301. The rear section 385 is formed by extending from the bottom 396 surface of the front section 383 to the inside of the second part 152 of the housing. The rear section 385 is formed by extending from the bottom surface of the front section 383 to the inside of the second part 152 of the housing. The cross-sectional area of ​​the rear section 385 is smaller than the area of ​​the bottom surface of the front section 383, so that the bottom surface of the front section 383 has a limiting surface surrounding the top of the rear section 385. The rear section 385 is separated from the exhaust chamber 301. A liquid, such as oil, is provided in the rear section 385 to form a blocking member hydraulic chamber 326. The pressure in the blocking member hydraulic chamber 326 can be adjusted so that the blocking member 318 can move in the blocking member hydraulic chamber 326. A spring 390 is provided in the blocking member hydraulic chamber 326. The spring 390 is arranged between the bottom of the blocking member hydraulic chamber 326 and the distal end of the rod 362 of the blocking member 318 to provide a certain support force for the blocking member 318. When the blocking member 318 moves in the blocking member hydraulic chamber 326, the sealing portion 361 moves in the front section 383. When the blocking member 318 moves upward (i.e., toward the housing mating surface 135) to the farthest distance, the upper surface 371 is flush with the housing mating surface 135. At this time, the auxiliary exhaust port 312 is closed, and the gas cannot enter the exhaust chamber 301 through the auxiliary exhaust port 312. When the blocking member 318 moves downward (i.e., away from the housing mating surface 135) to the farthest distance, the lower surface 372 abuts against the limit surface formed by the bottom surface of the front section 383, and the auxiliary exhaust port 312 is opened at this time, and the gas entering the auxiliary exhaust port 312 can enter the exhaust chamber 301 through the opening portion 399 of the front section 383. The second housing portion 152 also includes a hydraulic channel 377 communicated with the rear section 385, and the hydraulic channel 377 is communicated with a liquid (e.g., oil). The hydraulic channel 377 includes a high-pressure connecting channel 378 and a low-pressure connecting channel 379. The high-pressure connecting channel 378 and the low-pressure connecting channel 379 are respectively communicated with the high-pressure side 211 and the low-pressure side 212. Solenoid valves 336 and 337 are respectively provided on the high-pressure connecting channel 378 and the low-pressure connecting channel 379. By adjusting the opening and closing of the solenoid valves 336 and 337, the liquid pressure in the blocking member hydraulic chamber 326 can be adjusted, so that the blocking member 318 can move to open or close the auxiliary exhaust port 312.Since the pressure near the auxiliary exhaust ports 312 and 313 is relatively high and close to the exhaust pressure, a spring 390 is arranged in the hydraulic chamber of the blocking member to provide auxiliary supporting force for the blocking members 318 and 319. When the auxiliary exhaust ports 312 and 313 need to be closed, the pressure in the hydraulic chamber and the elastic force of the spring 390 jointly exert a force opposite to the exhaust pressure on the blocking member. The above force is greater than the exhaust pressure, so that the pressure in the hydraulic chamber and the spring 390 jointly support the blocking members 318 and 319 to remain in the closed position.

[0059] The cooperation between the blocking member 319 and the auxiliary exhaust port 313 is similar to the cooperation between the blocking member 318 and the auxiliary exhaust port 312 , and will not be described again here.

[0060] The position and shape of the internal exhaust port of the twin-screw compressor shown in the present application should ensure that the gas refrigerant achieves a predetermined compression in the compression chamber to improve the economy of the machine operation. In some compressions, the content volume ratio of the compressor can be adjusted, and for a predetermined content volume ratio, the area of ​​the exhaust port of the compressor needs to match the corresponding content volume ratio. For a compressor with a sliding valve, the exhaust port of the compressor includes a sliding valve exhaust port formed by one end of the sliding valve and a shell exhaust port formed by the shell. The sliding valve exhaust port can be opened under certain design conditions. The area setting of the sliding valve exhaust port and the shell exhaust port is related to the design conditions.

[0061] The inventor has found through research that when a compressor having a slide valve exhaust port and a shell exhaust port is operated under certain conditions, when the rotor just rotates to the compression chamber and is connected to the slide valve exhaust port, the pressure in the rotor compression chamber connected to the slide valve exhaust port will continue to rise, and continue to rise until the shell exhaust port is also opened and then rotates a certain angle (for example, about 5°), and then the pressure in the compression chamber begins to decrease rapidly, that is, when the rotor rotates to the compression chamber and is just connected to the slide valve exhaust port, the exhaust port flow area is insufficient, and the exhaust pressure is too high, which is higher than the pressure of the design working condition. Instantaneous excessive exhaust pressure will cause the pulsation energy amplitude to increase during the exhaust process, thereby increasing the compressor noise, and will also increase power consumption and reduce performance. In the present application, this problem can be improved by providing an openable auxiliary exhaust port. In the present application, when the operating content volume ratio of the compressor matches the design content volume ratio and the load is between 70% and 100%, the auxiliary exhaust port is opened to increase the exhaust port area when the rotor just rotates to the point where the compression chamber is connected to the exhaust port of the sliding valve, so as to reduce the exhaust pressure fluctuation, thereby further reducing noise and improving energy efficiency. The matching of the operating content volume ratio of the compressor described in the present application with the design content volume ratio means that the operating content volume ratio of the compressor is 0.95-1.05 times the design content volume ratio. The opening condition of the auxiliary exhaust port is set to a load between 70% and 100% because when the load is small, the exhaust port on the sliding valve has disappeared. In order to ensure the comprehensive partial load performance, the auxiliary exhaust port is not opened.

[0062] In one embodiment of the present application, the pressure fluctuation amplitude of the compressor is reduced by 13.3%, the power consumption is reduced from 196.2kw to 193.5kw, and the mass flow rate of the refrigerant is increased from 7.65kg / s to 7.7kg / s.

[0063] Figure 4A is a three-dimensional diagram of the second housing portion 452 and the blocking member of the second embodiment of the present application. Figure 4B yes Figure 4A An axial view of the second portion 452 of the middle housing, Figure 4C yes Figure 4A Schematic diagram of the blocking piece, Figure 4D yes Figure 4A A cross-sectional view of the second portion 452 of the middle housing, Figure 4E yes Figure 4A A cross-sectional view of the middle housing second portion 452 and the blocking member. Figure 4A The illustrated embodiment is similar in structure to the embodiment shown in FIG3A , except that the blocking members 418 and 419 move in different directions.

[0064] like Figure 4A-4E As shown, the second part 452 of the shell includes a pair of auxiliary exhaust ports 412 and 413, and a pair of blocking members 418 and 419. The following takes the blocking member 418 and the auxiliary exhaust port 412 as an example to introduce their matching relationship. The blocking member 418 includes a sealing portion 461 and a rod portion 462. The sealing portion 461 is roughly flat and has an upper surface 471 and a lower surface 472, as well as a first side portion 473 and a second side portion 474. The first side portion 473 faces the main exhaust port 411, and the second side portion 474 is away from the main exhaust port 411. The rod portion 462 is connected to the second side portion 474. The rod portion 462 is roughly cylindrical, and the radial cross-sectional area of ​​the rod portion 462 is smaller than the cross-sectional area of ​​the second side portion 474. The shape of the first edge of the upper surface 471 of the sealing portion 361 near the first side portion 473 matches the shape of the profile of the male rotor.

[0065] A pair of blocking member installation channels 481 and 482 are also provided in the second part 452 of the housing, for installing blocking members 418 and 419, respectively. The blocking member installation channels 481 and 482 are located on both sides of the exhaust chamber 401, and extend in a direction substantially parallel to the housing mating surface 435, respectively, away from the main exhaust port 411. The blocking member installation channel 481 includes a front section 483 and a rear section 485, the front section 483 is formed by being recessed inward from the housing mating surface, and the recessed depth is as large as the thickness of the sealing portion 461 of the blocking member 418, so that the upper surface of the sealing portion 461 installed in the front section 485 is flush with the housing mating surface 435. The side of the front section 485 includes a closed portion 498 formed by the inner wall of the housing and an opening portion 499 communicating with the main exhaust port 411. The rear section is formed by extending from the closed portion 498 to the inside of the second part 452 of the housing, away from the main exhaust port 411. Thus, the blocking member 418 installed in the blocking member installation channel 481 can move horizontally in a direction parallel to the housing mating surface 435. Liquid is provided in the rear section 485 to form a blocking member hydraulic chamber 426. The pressure in the blocking member hydraulic chamber 426 can be adjusted so that the blocking member 418 can move in the blocking member hydraulic chamber 426. A spring 490 is provided in the blocking member hydraulic chamber 426. The spring 490 is arranged between the end of the blocking member hydraulic chamber 426 and the distal end of the rod 462 of the blocking member 418 to provide a certain support force for the blocking member 418. When the blocking member 418 moves in the blocking member hydraulic chamber 426, the sealing portion 461 moves in the front section 483. When the blocking member 418 moves inward (i.e., toward the main exhaust port 411) to the farthest distance, the first edge of the upper surface 471 is connected to the main exhaust port 411. At this time, the auxiliary exhaust port 412 is closed, and the gas cannot enter the exhaust chamber 401 through the auxiliary exhaust port 412. When the blocking member 418 moves outward (i.e., away from the main exhaust port 411) to the farthest distance, the sealing portion 461 abuts against the limiting surface formed on the surface of the closing portion 498 of the front section 483. At this time, the auxiliary exhaust port 412 is opened, and the gas entering the auxiliary exhaust port 412 can enter the exhaust chamber 401 through the opening portion 499 of the front section 483.

[0066] The cooperation between the blocking member 419 and the auxiliary exhaust port 413 is similar to the cooperation between the blocking member 418 and the auxiliary exhaust port 412 , and will not be described again here.

[0067] Figure 5A is a three-dimensional diagram of the second housing portion 552 of the third embodiment of the present application. Figure 5B yes Figure 5A An axial view of the second portion 552 of the middle housing, Figure 5C yes Figure 5A A three-dimensional diagram of the blocking member in the middle, Figure 5D yes Figure 5A A cross-sectional view of the middle housing second portion 552 and the blocking member. Figure 5AThe embodiment shown is similar in structure to the embodiment shown in 3A, except that the relative positions of the auxiliary exhaust port and the main exhaust port are different.

[0068] like Figure 5A-5D As shown, the second part 552 of the shell includes a pair of auxiliary exhaust ports 512 and 513, and a pair of blocking members 518 and 519. The auxiliary exhaust ports 512 and 513 are respectively located on both sides of the main exhaust port 511, and are spaced apart from the main exhaust port 511. The following takes the blocking member 518 and the auxiliary exhaust port 512 as an example to introduce their matching relationship. The outer contour of the blocking member 518 is roughly cylindrical, and has an upper surface 571 and a lower surface 572, wherein the upper surface 571 includes a first portion 575 and a second portion 576, wherein the contour of the first portion 575 matches the shape of the auxiliary exhaust port 512. The bottom of the blocking member 518 has a recessed portion 579 formed by being recessed inward from the lower surface 572 (see Figure 5D ), the top of the recess 579 forms a spring abutment 578.

[0069] A pair of blocking member installation channels 581 and 582 are provided in the second part 552 of the housing, which are used to install blocking members 518 and 519 respectively. The blocking member installation channels 581 and 582 are located on both sides of the exhaust chamber 501 and extend toward the inside of the second part 552 of the housing along a direction substantially perpendicular to the housing mating surface 535. The blocking member installation channel 581 is formed by being recessed inward from the housing mating surface 535. The inner diameter of the blocking member installation channel 581 matches the outer diameter of the blocking member 518, and the depth of the blocking member installation channel 581 is greater than the height of the blocking member 518, so that the blocking member 518 can move in the blocking member installation channel 581. The blocking member installation channel 581 includes a front section 583 and a rear section 585, and the side of the front section 583 includes a closed portion 598 formed by the inner wall of the housing and an opening portion 599 communicating with the exhaust chamber 501. The rear section 585 extends from the bottom of the front section 583 toward the inside of the second part 552 of the housing. The opening 599 faces the slide valve mounting area 525 and is separated from the main exhaust port 511. Liquid is provided in the rear section 585 to form a blocking member hydraulic chamber 526, and the pressure in the blocking member hydraulic chamber 526 can be adjusted so that the blocking member 518 can move in the blocking member hydraulic chamber 526. A spring 590 is provided in the blocking member mounting channel 581, and the spring 590 is partially located in the recess 579 of the blocking member 518. One end of the spring 590 contacts the bottom of the blocking member hydraulic chamber 526, and the other end contacts the spring abutment 578 of the recess 579 of the blocking member 518. The spring 590 provides a certain support force for the blocking member 518. When the blocking member 518 moves upward (i.e., toward the housing mating surface 535) to the farthest distance in the blocking member hydraulic chamber 526, the upper surface 571 is flush with the housing mating surface 535, and the auxiliary exhaust port 512 is closed at this time, and the gas cannot enter the exhaust chamber 501 through the auxiliary exhaust port 512. When the blocking member 518 moves downward (i.e., away from the shell mating surface 535) to the farthest distance, the upper surface 571 is lower than the shell mating surface 535. At this time, the auxiliary exhaust port 512 is opened, and the gas entering the auxiliary exhaust port 512 can enter the exhaust chamber 501 through the opening portion 599 of the front section 583.

[0070] The cooperation between the blocking member 519 and the auxiliary exhaust port 513 is similar to the cooperation between the blocking member 518 and the auxiliary exhaust port 512 , and will not be described again here.

[0071] Figure 5A The embodiment shown is Figure 3A Compared with the embodiment shown in the figure, it is easier to process and manufacture, and can also achieve the following Figure 3A The embodiment shown has similar technical effects.

[0072] Fig. 6A is a three-dimensional diagram of the second housing portion 652 of the fourth embodiment of the present application. Figure 6B yes Fig. 6AAn axial view of the second portion 652 of the middle housing, Figure 6C yes Fig. 6A A three-dimensional diagram of the blocking member in the middle, Fig.6D yes Fig. 6A A cross-sectional view of the middle housing second portion 652 and the blocking member. Fig. 6A The embodiment shown is similar in structure to the embodiment shown in 5A, except that the shape of the auxiliary exhaust port is different.

[0073] like Figure 6A-6D As shown, the second housing portion 652 includes a pair of auxiliary exhaust ports 612 and 613, and a pair of blocking members 618 and 619. The auxiliary exhaust ports 612 and 613 are respectively located on both sides of the main exhaust port 611. The following takes the blocking member 618 and the auxiliary exhaust port 612 as an example to describe their matching relationship. The auxiliary exhaust port 612 includes a main body portion 641 and a connecting portion 642, and the auxiliary exhaust port 612 is connected to the main exhaust port 611 through the connecting portion 642.

[0074] The blocking member 618 includes a main body 645 and a convex portion 646. The main body 645 is generally cylindrical, and the convex portion 646 extends from the top of the main body 645 to one side of the main body 645. The blocking member 618 has an upper surface 671, wherein the upper surface 671 includes a first portion 675 and a second portion 676, wherein the contour of the first portion 675 matches the shape of the auxiliary exhaust port 612. The bottom of the blocking member 618 has a concave portion 679 formed by being recessed inward from the lower surface 672 (see Figure 5D ), the top of the recess 679 forms a spring abutment 678.

[0075] A pair of blocking member installation channels 681 and 682 are provided in the second part 652 of the shell, which are used to install blocking members 618 and 619 respectively. The blocking member installation channels 681 and 682 are located on both sides of the exhaust chamber 601 and extend toward the inside of the second part 652 of the shell in a direction substantially perpendicular to the shell mating surface 635. The blocking member installation channel 681 is formed by being recessed inward from the shell mating surface 635. The blocking member installation channel 681 includes a front section 683 and a rear section 685. The front section 683 includes a main body 648 and a connecting portion 649. The side of the main body 648 includes a closed portion 698 formed by the inner wall of the shell and an opening portion 699 communicating with the exhaust chamber 601. The connecting portion 649 extends from the main body 648 toward the main exhaust port 611 and communicates with the main exhaust port 611. The shape of the connecting portion 649 matches the shape of the protrusion 646 of the blocking member 618, and the depth of the connecting portion 649 is greater than the thickness of the protrusion 646, so that when the blocking member 618 is installed in the blocking member installation channel 681, the surface of the protrusion 646 can be lower than the housing mating surface 635. The rear section 685 is formed to extend from the bottom of the front section 683 to the inside of the second housing portion 652. The opening 699 faces the slide valve installation area 625 and is separated from the main exhaust port 611. Liquid is provided in the rear section 685 to form a blocking member hydraulic chamber 626, and the pressure in the blocking member hydraulic chamber 626 can be adjusted so that the blocking member 618 can move in the blocking member hydraulic chamber 626. A spring 690 is provided in the blocking member installation channel 681, and the spring 690 is partially located in the recess 679 of the blocking member 618. One end of the spring 690 contacts the bottom of the blocking member hydraulic chamber 626, and the other end contacts the spring abutment 678 of the recess 679 of the blocking member 618. The spring 690 provides a certain support force for the blocking member 618. When the blocking member 618 moves upward (i.e., toward the shell mating surface 635) to the farthest distance in the blocking member hydraulic chamber 626, the upper surface 671 is flush with the shell mating surface 635, at which time the auxiliary exhaust port 612 is closed, and the gas cannot enter the exhaust chamber 601 through the auxiliary exhaust port 612. When the blocking member 618 moves downward (i.e., away from the shell mating surface 635) to the farthest distance, the upper surface 671 is lower than the shell mating surface 635, at which time the auxiliary exhaust port 612 is opened, and the gas entering the auxiliary exhaust port 612 can enter the exhaust chamber 601 through the opening portion 699 of the front section 683 and the connecting portion 649.

[0076] The cooperation between the blocking member 619 and the auxiliary exhaust port 613 is similar to the cooperation between the blocking member 618 and the auxiliary exhaust port 612 , and will not be described again here.

[0077] and Figure 5A Compared to the embodiment shown, Fig. 6A In the embodiment shown, when the auxiliary exhaust port is opened, it is connected to the main exhaust port through the connecting portion, which is beneficial for rapidly reducing the pressure near the auxiliary exhaust port, thereby reducing the pressure fluctuation.

[0078] All embodiments described in the present application are applicable to the above-mentioned opening conditions of the auxiliary exhaust port, which is beneficial to reducing the exhaust pressure fluctuation of the compressor, thereby reducing noise and saving energy consumption.

[0079] Although only some features of the present application have been illustrated and described herein, various modifications and changes may be made to those skilled in the art. Therefore, it should be understood that the appended claims are intended to cover all the above modifications and changes that fall within the spirit and scope of the present application.

Claims

1. A compressor, characterized in that include: case; A pair of rotors, the pair of rotors are arranged in the housing, the pair of rotors can form a compression chamber, the pair of rotors have an intake end and an exhaust end, and an exhaust end surface located at the exhaust end; A slide valve, the slide valve is arranged in the housing, the slide valve has a slide valve head end and a slide valve tail end, in the axial direction of the pair of rotors, the slide valve head end and the slide valve tail end are arranged in the same direction as the suction end and the exhaust end of the pair of rotors, and the slide valve is configured to be able to reciprocate along the axial direction of the pair of rotors, the slide valve tail end is provided with a slide valve exhaust port, and the slide valve exhaust port can connect the compression chamber with the compressor exhaust port; Wherein, the shell has a shell mating surface arranged facing the exhaust end surface, and the shell mating surface has a rotor projection area, and the rotor projection area is a projection area formed on the shell mating surface along the axial direction during the rotation of the pair of rotors, and the rotor projection area is configured to be able to close the compression chamber, and a main exhaust port and at least one auxiliary exhaust port that can be opened and closed are provided in the rotor projection area, and the compression chamber can be connected with the compressor exhaust port through the main exhaust port, and the at least one auxiliary exhaust port is configured to be able to be opened and closed, and when the at least one auxiliary exhaust port is opened, the compression chamber can be connected with the compressor exhaust port through the at least one auxiliary exhaust port.

2. The compressor according to claim 1, characterized in that: The at least one auxiliary exhaust port is configured to be opened when the operation of the compressor reaches a predetermined condition.

3. The compressor according to claim 2, characterized in that: The predetermined condition is that the operating volume ratio of the compressor matches the designed volume ratio, and the load is between 70% and 100%.

4. The compressor according to claim 1, characterized in that: The compressor further includes a blocking member movably disposed in the housing, the blocking member being capable of moving into and out of the at least one auxiliary exhaust port to open and close the at least one auxiliary exhaust port.

5. The compressor according to claim 4, characterized in that: A blocking member hydraulic chamber is provided in the housing, the blocking member is disposed in the blocking member hydraulic chamber, and the pressure in the blocking member hydraulic chamber can be adjusted so that the blocking member can move in the blocking member hydraulic chamber.

6. The compressor according to claim 1, characterized in that: The at least one auxiliary exhaust port extends continuously with the main exhaust port.

7. The compressor according to claim 1, characterized in that: The shape of at least a portion of an edge of the at least one auxiliary exhaust port matches the shape of a profile of the teeth of the pair of rotors.

8. The compressor according to claim 4, characterized in that: The blocking member is configured to move along an axial direction of the pair of rotors.

9. The compressor according to claim 4, characterized in that: The blocking member is configured to move in a radial direction parallel to the pair of rotors so as to gradually open and close the auxiliary exhaust port.

10. A refrigeration system, characterized in that: The compressor according to any one of claims 1 to 9, wherein a blocking member hydraulic chamber is provided in the housing of the compressor; and A high-pressure connecting channel and a low-pressure connecting channel, wherein the high-pressure connecting channel is provided with a first valve, and the low-pressure connecting channel is provided with a second valve. The high-pressure connecting channel connects the hydraulic chamber of the blocking member with the high-pressure side of the refrigeration system, and the low-pressure connecting channel connects the hydraulic chamber of the blocking member with the low-pressure side of the refrigeration system. The refrigeration system can adjust the pressure in the hydraulic chamber of the blocking member by adjusting the opening and closing of the first valve and the second valve.

11. The refrigeration system of claim 10, wherein: The compressor also includes a blocking member, which is movably arranged in the shell. The compressor is also provided with a spring, which is at least partially located in the hydraulic chamber of the blocking member and is configured to provide auxiliary supporting force to the blocking member when the at least one auxiliary exhaust port is closed.

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