Compressor

Abstract

A compressor, comprising a housing (101) and a pair of rotors (110). The pair of rotors (110) is provided in the housing (101). A compression accommodating cavity (105) is formed between the pair of rotors (110) and the inner wall of the housing (101). The housing (101) has a housing matching surface (135) configured to face exhaust ends (122) of the pair of rotors (110); at least one auxiliary exhaust port (312, 313) is formed in the housing matching surface (135); the at least one auxiliary exhaust port (312, 313) is configured to be capable of being opened and closed; and when the at least one auxiliary exhaust port (312, 313) is opened, the compression accommodating cavity (105) can be in communication with a compressor exhaust port (142) by means of the at least one auxiliary exhaust port (312, 313). The shape of at least part of the edge of the at least one auxiliary exhaust port (312, 313) conforms to the shape of molded lines of teeth of the pair of rotors (110). The at least one auxiliary exhaust port (312, 313) is configured to be opened or closed on the basis of the internal volume ratio and the system pressure ratio of the compressor such that the internal volume ratio and the system pressure ratio of the compressor match each other.

Description

compressor Technical Field

[0001] The present application provides a compressor, in particular a twin-screw compressor used in a refrigeration system. Background Art

[0002] A twin-screw compressor has a pair of intermeshing male and female rotors that rotate relative to each other to compress the refrigerant. The compressor is connected to an oil supply system, which provides lubricating oil (or other media) to ensure the smooth operation of the rotors and other components within the compressor.

[0003] Summary of the Invention

[0004] 20. The air compressor of claim 19, wherein the exhaust port of the compressor is an air compressor and wherein the exhaust port of the compressor is a fluid port. The exhaust port of the compressor is located adjacent the exhaust port of the compressor and wherein the exhaust port of the compressor is located adjacent the exhaust port of the compressor.

[0005] The compressor as described above further includes at least one exhaust piston and an actuator, wherein the at least one exhaust piston is used to open or close the at least one auxiliary exhaust port, and the shape of the at least one exhaust piston matches the shape of the at least one auxiliary exhaust port; the actuator is used to drive the at least one exhaust piston.

[0006] The compressor as described above further includes: a control device and a sensing device, the sensing device being used to sense the suction pressure and exhaust pressure of the compressor; wherein the suction pressure and exhaust pressure of the compressor are transmitted to the control device, and the control device is configured to: store the internal volume ratio of the compressor and receive signals of the suction pressure and exhaust pressure of the compressor, calculate the system pressure ratio based on the suction pressure and exhaust pressure of the compressor, and thereby drive the execution device based on the internal volume ratio and the system pressure ratio, so that the at least one auxiliary exhaust port is opened or closed.

[0007] In the compressor as described above, the actuator includes a solenoid valve.

[0008] In the compressor as described above, the at least one auxiliary exhaust port includes a first edge. During the rotation of the pair of rotors, the first edge can first contact the compression chamber, and the shape of the first edge is consistent with the shape of the profile of the corresponding teeth of the pair of rotors.

[0009] As described above, in the compressor, the profile of each tooth of each rotor in the pair of rotors has a tooth top, an upstream tooth root and a downstream tooth root, the downstream tooth root is located downstream in the rotation direction of the corresponding rotor, and the length of the first edge is not less than the length from the upstream tooth root to the tooth top of the corresponding tooth of the pair of rotors.

[0010] As described above, in the compressor, the profile of each tooth of each rotor in the pair of rotors has a tooth top, an upstream tooth root and a downstream tooth root, and the at least one auxiliary exhaust port includes a second edge, which is located on the side of the auxiliary exhaust port close to the center of the corresponding rotor, and at least a portion of the second edge coincides with the tooth root circumference where the upstream tooth root and the downstream tooth root of the tooth of the corresponding rotor are located, or is located on the inner side of the tooth root circumference.

[0011] In the compressor as described above, the at least one auxiliary exhaust port further includes a third edge, the third edge being connected to the first edge and the second edge and protruding in a direction away from the first edge and the second edge.

[0012] In the compressor as described above, the at least one auxiliary exhaust port includes a plurality of auxiliary exhaust ports, and the plurality of auxiliary exhaust ports are sequentially arranged along the rotation direction of the pair of rotors.

[0013] The compressor as described above further includes a guide passage, wherein the guide passage is capable of connecting the at least one auxiliary exhaust port with the compressor exhaust port.

[0014] In this application, the compressor exhaust seat includes an auxiliary exhaust port and a piston. The piston can open and close the auxiliary exhaust port to adjust the compressor's internal volume ratio. The auxiliary exhaust port is shaped so that at least one section matches the rotor profile. The auxiliary exhaust port's shape allows for more accurate adjustment of the compressor's internal volume ratio, better matching it with the system's condensing pressure, and can reduce power consumption and improve compressor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1A is a perspective view of a first embodiment of a compressor in the present application;

[0016] FIG1B is an axial cross-sectional view of the compressor in FIG1A taken along line AA and in the horizontal direction;

[0017] FIG2 is a schematic diagram of the shape of the exhaust ends of a pair of rotors in FIG1B;

[0018] FIG3A is a perspective view of the exhaust seat in FIG1A ;

[0019] FIG3B is a view of FIG3A as viewed from the mating surface of the exhaust seat;

[0020] FIG3C is a cross-sectional view taken along line BB in FIG3B ;

[0021] FIG4A is a perspective view of an exhaust piston of a compressor;

[0022] FIG4B is a front view of the piston in FIG4A as viewed from one end;

[0023] FIG5 is a cross-sectional view of the exhaust seat and the piston in FIG3C;

[0024] FIG6A is a schematic diagram of the male rotor rotating until a compression chamber just contacts the auxiliary exhaust port;

[0025] FIG6B is a schematic diagram showing the male rotor rotating to a point where a compression chamber slightly overlaps with the auxiliary exhaust port;

[0026] FIG6C is a schematic diagram showing the male rotor rotating until a compression chamber rotates until it is about to contact the auxiliary exhaust port;

[0027] FIG7 is a schematic diagram of the internal volume adjustment system of the compressor in the present application;

[0028] FIG8 is a schematic block diagram of the structure of the control device shown in FIG7 ;

[0029] FIG. 9 is a schematic diagram of an exhaust seat of a second embodiment of a compressor in the present application. DETAILED DESCRIPTION

[0030] 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", "back", "up", "down", "left", "right", "inside", "outside", "top", "bottom", "positive", "negative", "proximal", "distal", "lateral", "longitudinal", etc., are used in this 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 are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this application can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations.

[0031] Figure 1A is a perspective view of the first embodiment of the compressor in this application, illustrating the external structure of the compressor. Figure 1B is an axial cross-sectional view of the compressor in Figure 1A taken along line AA and in the horizontal direction, illustrating the lateral structure inside the compressor.

[0032] As shown in Figures 1A-1B, the screw compressor 100 includes a housing 101 and a pair of rotors 110 disposed in the rotor housing 101. The pair of rotors 110 includes a pair of intermeshing male rotors 102 and female rotors 103, which can be driven to rotate. The male rotor 102 has a male rotor body 120 and male rotor connecting portions 128 and 129. The male rotor connecting portions 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 portion 129 is pivotally connected to the housing 101, and the male rotor connecting portion 128 is transmission-connected to the motor 140, so that the motor 140 can drive the male rotor 102 to rotate about the axis of the male rotor 102 relative to the housing 101. Similarly, the female rotor 103 includes a female rotor body 130 and female rotor connecting portions 138 and 139. The female rotor connecting portion 138 is located at both ends of the female rotor body 130 in the axial direction, forming the female rotor's axis. The female rotor connecting portions 138 and 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 about the axis of the female rotor 103. The outer side of the male rotor body 120 has a plurality of spiral teeth 168 and tooth grooves, each formed by adjacent teeth 168. The outer side of the female rotor body 130 also has a plurality of spiral teeth 169 and tooth grooves, each formed by adjacent teeth 169. The teeth 168 and tooth grooves of the male rotor body 120 and the tooth grooves and teeth 169 of the female rotor body 130 form an intermeshing structure, so that the male rotor body 120, the female rotor body 130, and the housing 101 collectively form the compression chamber 105. The housing 101 has a compressor intake port 141 and a compressor exhaust port 142 . Refrigerant enters the compressor from the compressor intake port 141 and is discharged from the compressor exhaust port 142 after being compressed.

[0033] 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. Refrigerant gas is drawn 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. Simultaneously, 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 then discharged from the exhaust end 122.

[0034] As shown in Figures 1A and 1B, the housing 101 includes a rotor seat 151 and an exhaust seat 152, which are connected to each other. The compressor intake port 141 is located on the rotor seat 151, and the compressor exhaust port 142 is located on the exhaust seat 152. The main body of the pair of rotors 110 (i.e., the portion with the spiral teeth, that is, the portion from the intake end 121 to the exhaust end 122) is located in the rotor seat 151. The exhaust end 122 of the pair of rotors 110 has an exhaust end surface 125, and the exhaust seat 152 has a housing mating surface 135. The exhaust end surface 125 is located opposite the housing mating surface 135 and is adjacent to the housing mating surface 135.

[0035] Figure 2 is a schematic diagram of the exhaust end shape of the pair of rotors in Figure 1B. Figure 3 shows the exhaust end surface 125 of the pair of rotors 110. The male rotor 102 and the female rotor 103 rotate in the direction indicated by the arrows. On the exhaust end surface 125, the outer contours of the teeth of the male rotor 102 and the female rotor 103 form a rotor profile. Each of the male rotors 102 and the female rotor 103 has a plurality of teeth, each of which has the same shape as the adjacent teeth. Each tooth of the male rotor 102 has a tooth tip 221, an upstream tooth root 222, and a downstream tooth root 223. In the direction of rotation of the male rotor, the upstream tooth root 222 is located upstream of the downstream tooth root 223. The upstream tooth root 222 of each tooth coincides with the downstream tooth root 223 of the adjacent tooth. The teeth of the male rotor 102 are evenly distributed, with the tooth tips 221 of each tooth on the same circumference, which is the tooth tip circumference 251. The upstream tooth root 222 and the downstream tooth root 223 of each tooth are on the same circumference, which is the tooth root circumference 252 .

[0036] Similarly, each tooth of the female rotor 103 has a tooth tip 231, an upstream tooth root 232, and a downstream tooth root 233. In the direction of rotation of the female rotor, the upstream tooth root 232 is located upstream of the downstream tooth root 233. The upstream tooth root 232 of each tooth coincides with the downstream tooth root 233 of the adjacent tooth. The teeth of the female rotor 103 are evenly distributed, with the tooth tip 231 of each tooth located on the same tooth tip circumference 261, and the upstream tooth root 232 and downstream tooth root 233 of each tooth located on the same tooth root circumference 262.

[0037] Figure 3A is a perspective view of the exhaust seat shown in Figure 1A, Figure 3B is a view of the exhaust seat from the mating surface of Figure 3A, and Figure 3C is a cross-sectional view taken along line BB of Figure 3B. As shown in Figures 3A and 3B, the exhaust seat 152 has a substantially planar housing mating surface 135 on the side facing the rotor seat 151. The exhaust seat 152 comprises an exhaust cavity 301, a pair of rotor shaft mounting passages 304 and 305, a pair of piston mounting passages 381 and 382, ​​and a pair of guide passages 387 and 388. The pair of rotor shaft mounting passages 304 and 305 are used to mount the male rotor connecting portion 129 and the female rotor connecting portion 139, respectively. The pair of rotor shaft mounting passages 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 main exhaust port 311, while the other end extends through the outer surface of the exhaust seat 152 to communicate with the compressor exhaust port 142. The main exhaust port 311 is thus connected to the compressor exhaust port 142. Piston mounting passages 381 and 382 are located on either side of the exhaust chamber 301 and extend in a direction generally perpendicular to the housing mating surface 135. One end of each of the piston mounting passages 381 and 382 extends through the housing mating surface 135 to form auxiliary exhaust ports 312 and 313. A guide passage 387 is provided between the piston mounting passage 381 and the exhaust chamber 301, connecting the piston mounting passage 381 with the exhaust chamber 301. A guide passage 388 is provided between the piston mounting passage 382 and the exhaust chamber 301, connecting the piston mounting passage 382 with the exhaust chamber 301. In one embodiment of the present application, the guide passages 387 and 388 are recessed grooves extending from the housing mating surface 135 toward the interior of the exhaust seat 152. The ends of the guide passage 387 communicate with the sidewalls of the piston mounting passage 382 and the exhaust chamber 301, respectively, thereby connecting the auxiliary exhaust port 312 with the compressor exhaust port 142. Both ends of the guide passage 388 communicate with the sidewalls of the piston mounting passage 382 and the exhaust chamber 301 , respectively, so that the guide passage 388 connects the auxiliary exhaust port 312 and the compressor exhaust port 142 .

[0038] As shown in Figure 3B, the peripheral edge of the auxiliary exhaust port 312 includes a first control point D1, a second control point D2, and a third control point D3. The first, second, and third control points D1, D2, and D3 divide the peripheral edge of the auxiliary exhaust port 312 into three sections: a first edge 351 formed between the first and second control points D1 and D2, a second edge 352 formed between the first and third control points D1 and D3, and a third edge 353 formed between the second and third control points D2 and D3. The shape of the first edge 351 matches the profile of the male rotor's teeth and is equal to the length from the upstream tooth root 222 to the tooth tip 221 of a male rotor tooth. The second edge 352 coincides with the tooth root circumference 252. The third edge 353 connects the first and second edges 351 and 352 and bulges away from the first and second edges 351 and 352. The third edge 353 is generally arc-shaped.

[0039] The shape of the first edge 351 matches the shape of the profile of the teeth of the male rotor, which is beneficial for smoothing the pressure change trend when the compression chamber 105 sweeps across the auxiliary exhaust port 312. In one embodiment of the present application, the second edge 352 coincides with the tooth root circumference 252, so that the compression chamber 105 can have a sufficiently large contact area with the auxiliary exhaust port 312 during the process of rotating and sweeping across the auxiliary exhaust port 312. In another embodiment of the present application, the second edge 352 protrudes toward the central axis of the male rotor 102, and at least a portion of the second edge 352 is located on the inner side of the tooth root circumference 252 to increase the area of ​​the auxiliary exhaust port 312, so that the compression chamber 105 can have a sufficiently large contact area with the auxiliary exhaust port 312 during the process of rotating and sweeping across the auxiliary exhaust port 312. The third edge 353 protrudes in a direction away from the first edge 351 and the second edge 352, and at least a portion of the third edge 353 is located outside the tooth top circle 251, so that the auxiliary exhaust port 312 has a larger exhaust area, that is, the compression chamber 105 has a larger contact area with the auxiliary exhaust port 312 during the process of rotating over the auxiliary exhaust port 312.

[0040] Similarly, auxiliary exhaust port 313 has a first edge 371 that matches the profile of the female rotor. First edge 371 is equal to the length from the upstream tooth root 232 to the tooth tip 231 of a tooth of the female rotor. Second edge 372 coincides with tooth root circumference 262, or at least a portion of second edge 372 extends inward beyond tooth root circumference 262. Third edge 373 connects first edge 371 and second edge 372 and bulges away from first edge 371 and second edge 372. Third edge 373 is generally arc-shaped.

[0041] FIG3C shows piston mounting passage 381. As shown in FIG3C , piston mounting passage 381 includes a front section 383 and a rear section 385. The shape of each cross section of front section 383 matches the shape of auxiliary exhaust port 312. Similarly, piston mounting passage 382 also includes a front section 386 and a rear section 389. The shape of each cross section of front section 386 matches the shape of auxiliary exhaust port 312.

[0042] In one application of the present application, for ease of machining, the second edge 352 and the second edge 372 are configured to approximately coincide with the corresponding tooth root circumferences, rather than strictly coincide with each other.

[0043] Figure 4A is a perspective view of an exhaust piston of the compressor, and Figure 4B is a front view of the piston in Figure 4A as viewed from one end. As shown in Figure 4A, piston 401 is a first movable piston installed in piston mounting passage 381. Piston 401 includes a body 411 and a head 412, wherein the shape of head 412 matches the shape of front section 383 of piston mounting passage 381. The end surface of head 412 forms a sealing surface 440, which is capable of sealing auxiliary exhaust port 312. Piston 401 is movable within piston mounting passage 381 to open or close auxiliary exhaust port 312.

[0044] FIG4B shows the shape of the sealing surface 440. As shown in FIG4B , the sealing surface 440 is roughly in the shape of a teardrop. The sealing surface 440 matches the shape of the auxiliary exhaust port 312. The edges of the sealing surface 440 are provided with a first control point P1, a second control point P2, and a third control point P3, so that the edges of the sealing surface 440 are formed into three segments. The first control point P1, the second control point P2, and the third control point P3 coincide with the first control point D1, the second control point D2, and the third control point D3 of the auxiliary exhaust port 312, respectively. A first segment 441 is formed between the first control point P1 and the second control point P2, a second segment 442 is formed between the first control point P1 and the third control point P3, and a third segment 443 is formed between the second control point P2 and the third control point P3. The shape of the first segment 441 matches the shape of the first edge 351 of the auxiliary exhaust port 312 , the shape of the second segment 442 matches the shape of the second edge 352 of the auxiliary exhaust port 312 , and the shape of the third segment 443 matches the shape of the third edge of the auxiliary exhaust port 312 .

[0045] Figures 4A and 4B show a first piston that cooperates with the piston mounting channel 381. A second piston is provided in the piston mounting channel 382. The structure of the second piston is similar to that of the first piston 401. The shape of the sealing surface of the second piston matches the auxiliary exhaust port 313 and will not be repeated here.

[0046] Figure 5 is a cross-sectional view of the exhaust seat and the piston in Figure 3C. The cross-sectional angle of Figure 5 is the same as that of Figure 3C, and the view of Figure 5 includes the piston 401.

[0047] As shown in Figure 5, piston 401 is disposed in piston mounting passage 381. A spring chamber 512 is formed inwardly from the end surface of piston body 411. A spring 504 is disposed in spring chamber 512, with one end of spring 504 resting against the top 522 of spring chamber 512 and the other end against the bottom 529 of piston mounting passage 381. Spring 504 provides a spring force. The length of piston 401 is shorter than that of piston mounting passage 381, enabling piston 401 to move within it. Piston mounting passage 381 is connected to the compressor's oil system via a solenoid valve assembly 560. By controlling the closing and opening of solenoid valve assembly 560, the pressure in piston mounting passage 381 is adjusted, thereby driving piston 401 to move. Solenoid valve assembly 560 includes one or more solenoid valves.

[0048] Figure 6A is a schematic diagram of the male rotor rotating until a compression chamber just contacts the auxiliary exhaust port, Figure 6B is a schematic diagram of the male rotor rotating until a compression chamber slightly overlaps the auxiliary exhaust port, and Figure 6C is a schematic diagram of the male rotor rotating until a compression chamber is about to contact the auxiliary exhaust port. Figures 6A to 6C illustrate the process of a compression chamber and an auxiliary exhaust port overlapping.

[0049] In the present application, the cooperation process between the first piston 401 and the male rotor 102 is similar to the cooperation process between the second piston 601 and the female rotor. The following will take the cooperation between the first piston 401 and the male rotor 102 as an example to introduce the working process.

[0050] In one application of the present application, the piston 401 is used to adjust the volume ratio of the compressor. By opening and closing the piston 401, the auxiliary exhaust port 312 is connected to or disconnected from the exhaust chamber 301, and the volume ratio of the compressor can be adjusted in steps. When the system pressure of the compressor does not match the volume ratio of the compressor, the volume ratio can be adjusted to match the system pressure by adjusting the opening and closing of the piston 401. When the piston 401 opens the auxiliary exhaust port 312, the compression chamber 105 starts to exhaust when it rotates to coincide with the auxiliary exhaust port 312. That is to say, when the auxiliary exhaust port 312 is opened, the compression chamber 105 has not yet rotated to coincide with the main exhaust port 311 and starts to exhaust.

[0051] When auxiliary exhaust port 312 is open, the compression chamber 105 will pass through the auxiliary exhaust port 312 during the rotation of the male rotor 102 and exhaust. In existing technologies, the auxiliary exhaust port is usually a regular circle. As the compression chamber 105 passes through the auxiliary exhaust port 312, the overlapping portion of the compression chamber 105 and the circular auxiliary exhaust port 312 does not gradually change. As a result, the internal volume ratio constantly changes with the rotation of the rotor, and cannot fully match the system pressure, resulting in a certain amount of power loss.

[0052] In the present application, as shown in Figures 6A to 6C, when the compression chamber 105 has just rotated to a position where it can contact the auxiliary exhaust port 312, since the shape of the first edge 351 of the auxiliary exhaust port 312 matches the profile of the teeth of the male rotor 102, the overlapping portion of the auxiliary exhaust port 312 and the compression chamber 105 can change in an orderly and stable manner. In other words, the exhaust area corresponding to the compression chamber 105 changes steadily, and will not suddenly expand or shrink, or expand and shrink alternately in the short period of time when the compression chamber 105 just passes the auxiliary exhaust port 312. This makes the adjustment of the internal volume ratio more accurate, more compatible with the system condensing pressure, and can reduce power consumption losses and improve compressor efficiency.

[0053] In the present application, the shape setting of the second edge 352 and the third edge 353 of the auxiliary exhaust port 312 ensures that the auxiliary exhaust port has sufficient exhaust area, avoiding fluctuations in the actual exhaust area when the compression chamber 105 passes over the auxiliary exhaust port 312.

[0054] Figure 7 is a schematic diagram of the internal volume control system of the compressor in this application. As shown in Figure 7, the compressor includes a control device 701, an actuator 702, a sensor device 703, and an exhaust piston 704. The exhaust piston includes a first piston and a second piston, which are used to open or close the corresponding auxiliary exhaust port. The actuator 702 is capable of driving the exhaust piston 704 to move. The sensor device 703 is disposed at the suction and discharge ends of the compressor and is used to sense the suction and discharge pressures of the compressor. The control device 701 is capable of storing the internal volume ratio of the compressor and receiving signals of the suction and discharge pressures of the compressor. Based on the suction and discharge pressures of the compressor, the system pressure ratio is calculated and determined whether the internal volume ratio matches the system pressure ratio. If the internal volume ratio does not match the system pressure ratio, the control device 701 determines a target internal volume ratio that matches the system pressure ratio and drives the actuator 702 based on the target internal volume ratio to open or close the corresponding auxiliary exhaust port 312. The actuator 702 is a solenoid valve assembly 560.

[0055] FIG8 is a block diagram of the structure of the control device shown in FIG7 . As shown in FIG8 , as an embodiment, the control device 701 includes a bus 800, a processor 801, an input interface 802, an output interface 803, and a memory 804 having a control program. The various components in the control device 701, including the processor 801, the input interface 802, the output interface 803, and the memory 804, are communicatively connected to the bus 800 so that the processor 801 can control the operation of the input interface 802, the output interface 803, and the memory 804. Specifically, the memory 804 is used to store programs (e.g., the volume ratio of the compressor), instructions, and data, and the processor 801 reads programs, instructions, and data from the memory 804 and can write data to the memory 804. By executing the programs and instructions read from the memory 804, the processor 801 controls the operation of the memory 804, the input interface 802, and the output interface 803. Input interface 802 converts signals received from external devices into signals that processor 801 can recognize and process, while output interface 803 converts signals output by processor 801 into signals suitable for external devices. As shown in Figure 8, the signal processing unit receives exhaust pressure and suction pressure signals from sensor device 703 via input interface 802 and converts them into digital signals that processor 801 can recognize and calculate. These digital signals are stored in memory 804 for later processing. By executing the program and instructions in memory 804, processor 801 executes the program to adjust the compressor's internal volume ratio.

[0056] Figure 9 is a schematic diagram of the exhaust block of the second embodiment of the compressor of this application. Unlike the embodiment shown in Figure 1A, the exhaust block of the compressor in Figure 9 has four auxiliary exhaust ports 901, 902, 903, and 904, and corresponding pistons that cooperate with the four auxiliary exhaust ports. In the embodiment shown in Figure 9, multi-stage adjustment of the internal volume ratio of the compressor can be achieved by controlling the opening and closing of the multiple auxiliary exhaust ports.

[0057] In another embodiment of the present application, the number of the auxiliary exhaust ports may be other numbers, which is determined based on actual application conditions.

[0058] Although only some features of the present application have been illustrated and described herein, various modifications and variations may be made by those skilled in the art. It should be understood that the appended claims are intended to cover all such modifications and variations that fall within the spirit and scope of the present application.

Claims

1. A compressor, characterized in that include: A housing (101), the housing (101) having a compressor exhaust port (142); A pair of rotors (110), the pair of rotors (110) being arranged in the housing (101), a compression chamber (105) being formed between the pair of rotors (110) and an inner wall of the housing, and the pair of rotors (110) having an intake end (121) and an exhaust end (122); The shell (101) has a shell mating surface (135) arranged facing the exhaust end (122); a main exhaust port (311) and at least one auxiliary exhaust port (312, 313) that can be opened and closed are arranged in the shell mating surface (135); the compression chamber (105) can be communicated with the compressor exhaust port (142) through the main exhaust port (311); the at least one auxiliary exhaust port (312, 313) is configured to be openable and closable; and when the at least one auxiliary exhaust port (312, 313) is opened, the compression chamber (105) can be communicated with the compressor exhaust port (142) through the at least one auxiliary exhaust port (312, 313); wherein the shape of at least a portion of the edge of the at least one auxiliary exhaust port (312, 313) is consistent with the shape of the profile of the teeth of the pair of rotors; The at least one auxiliary exhaust port (312, 313) is configured to be opened or closed according to the internal volume ratio of the compressor and the system pressure ratio, so that the internal volume ratio of the compressor matches the system pressure ratio.

2. The compressor according to claim 1, characterized in that Also includes: at least one exhaust piston (704), the at least one exhaust piston (704) being used to open or close the at least one auxiliary exhaust port (312, 313), the shape of the at least one exhaust piston (704) matching the shape of the at least one auxiliary exhaust port (312, 313); An actuator (702), the actuator (702) being used to drive the at least one exhaust piston (704).

3. The compressor according to claim 2, characterized in that Also includes: A control device (701) and a sensor device (703), wherein the sensor device (703) is used to sense the suction pressure and the exhaust pressure of the compressor; The suction pressure and exhaust pressure of the compressor are transmitted to the control device (701), and the control device (701) is configured to: store the content volume ratio of the compressor and receive the signals of the suction pressure and exhaust pressure of the compressor, calculate the system pressure ratio according to the suction pressure and exhaust pressure of the compressor, and drive the actuator (702) according to the content volume ratio and the system pressure ratio, so that the at least one auxiliary exhaust port (312, 313) is opened or closed.

4. The compressor according to claim 2, characterized in that: The actuator (702) includes a solenoid valve.

5. The compressor according to claim 1, characterized in that: The at least one auxiliary exhaust port (312, 313) includes a first edge (351, 371), and during the rotation of the pair of rotors (110), the first edge (351, 371) can first contact the compression chamber (105), and the shape of the first edge (351, 371) is consistent with the shape of the profile of the corresponding teeth of the pair of rotors.

6. The compressor according to claim 5, characterized in that: The profile of each tooth of each rotor in the pair of rotors has a tooth top, an upstream tooth root and a downstream tooth root, the downstream tooth root is located downstream in the rotation direction of the corresponding rotor, and the length of the first edge (351, 371) is not less than the length from the upstream tooth root to the tooth top of the corresponding tooth of the pair of rotors.

7. The compressor according to claim 5, characterized in that: The profile of each tooth of each rotor in the pair of rotors has a tooth top, an upstream tooth root and a downstream tooth root, and the at least one auxiliary exhaust port (312, 313) includes a second edge (352, 372), and the second edge (352, 372) is located on a side of the auxiliary exhaust port (312, 313) close to the center of the corresponding rotor, and at least a portion of the second edge (352, 372) coincides with the tooth root circumference where the upstream tooth root and the downstream tooth root of the tooth of the corresponding rotor are located, or is located on the inner side of the tooth root circumference.

8. The compressor according to claim 7, characterized in that: The at least one auxiliary exhaust port (312, 313) further includes a third edge (353, 373), wherein the third edge (353, 373) is aligned with the first edge (351, 371) and the second edge (352, 372). The first edge (351, 371) and the second edge (352, 372) are connected and protrude in a direction away from the first edge (351, 371) and the second edge (352, 372).

9. The compressor according to claim 1, characterized in that: The at least one auxiliary exhaust port (312, 312) includes a plurality of auxiliary exhaust ports, and the plurality of auxiliary exhaust ports are sequentially arranged along a rotation direction of the pair of rotors (110).

10. The compressor according to claim 1, characterized in that: The compressor further includes a guide passage (387, 388) capable of connecting the at least one auxiliary exhaust port (312, 313) to the compressor exhaust port (142).

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