compressor

Abstract

The present application discloses a compressor. The compressor includes a screw, a star wheel and a housing. The screw is provided with a screw groove. The housing covers the screw groove, and the housing includes a fixed portion and a movable portion. The fixed portion and the movable portion cover the screw groove. The fixed portion is provided with a movable groove connecting the air inlet and the air outlet of the compressor. The fixed portion is also provided with a through hole. The star wheel penetrates the through hole and meshes with the screw. The star wheel, the housing and the screw groove together enclose a compression space. The movable portion is movably arranged in the movable groove. The movable portion moves to change the volume of the compression space, and the volume of the compression space matches the gas output required by the compressor. At the same time, after the movable portion moves, the movable portion does not cause the compression space to be divided into multiple areas. The gas entering the compression space will complete the compression normally until it enters the air outlet of the compressor. In this way, there is no invalid compression work loss in the present application, and the present application can improve the efficiency of the compressor during partial unloading.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and more specifically, to a compressor. Background Art

[0002] At present, the gas delivery adjustment of single screw compressors is generally achieved through a moving part (i.e., unloading slide valve) arranged on the shell. However, since the moving part is located in the middle of the screw rotor, the gas discharged from the moving part is compressed gas, resulting in a period of ineffective compression of the compressor, thereby causing a loss of compressor efficiency. Summary of the invention

[0003] An embodiment of the present application provides a compressor.

[0004] The compressor of the embodiment of the present application includes a screw, a star wheel and a housing. The screw is provided with a screw groove. The housing covers the screw groove, and the housing includes a fixed part and a movable part, the fixed part and the movable part cover the screw groove, the fixed part is provided with a movable groove connecting the air inlet and the air outlet of the compressor, the fixed part is also provided with a through hole, the star wheel passes through the through hole and meshes with the screw, the star wheel, the housing and the screw groove together enclose a compression space, the movable part is movably arranged in the movable groove, and the movable part moves to change the volume of the compression space.

[0005] In certain embodiments, the moving portion moves along the axial direction of the screw, and when the compressor needs to reduce the gas delivery volume, the moving portion moves in a direction away from the gas inlet.

[0006] In some embodiments, the compressor includes a first driving device connected to the moving part, and the first driving device is used to drive the moving part to move.

[0007] In some embodiments, the first driving device includes a cylinder and a guide rod, wherein the cylinder is connected to one end of the guide rod, and the other end of the guide rod is connected to the moving part, and the cylinder is used to drive the guide rod to move, so as to drive the moving part to move toward a direction close to the air inlet or toward a direction away from the air inlet.

[0008] In some embodiments, the cylinder includes a cylinder body, a piston and a piston rod, the piston is movably disposed in the cylinder, one end of the piston rod is connected to the piston, and the other end of the piston rod is connected to the guide rod.

[0009] In some embodiments, the first driving device includes a motor and a moving member, the motor is connected to the moving member, the moving member is connected to the moving part, and the motor is used to drive the moving member to move so as to drive the moving part to move toward a direction close to the air inlet or toward a direction away from the air inlet.

[0010] In certain embodiments, the compressor includes a position sensor for detecting a current position of the moving part.

[0011] In certain embodiments, the compressor includes a second driving device connected to the screw, and the second driving device is used to drive the screw to rotate and to change the rotation speed of the screw.

[0012] In some embodiments, there are two star wheels, and the two star wheels are symmetrically distributed along the central axis of the screw.

[0013] In some embodiments, there are two moving parts.

[0014] The compressor of the embodiment of the present application includes a shell, a screw and a star wheel, and the shell, the screw grooves on the screw and the star wheel enclose a compression space. The shell includes a fixed part and a movable part, and the fixed part is provided with a movable groove connecting the air inlet and the air outlet of the compressor, and the movable part is movably arranged in the movable groove. After the movable part moves, the volume of the compression space can be changed, and the volume of the compression space matches the air output required by the compressor. At the same time, after the movable part moves, the movable part will not cause the compression space to be divided into multiple areas, and the gas entering the compression space will complete the compression normally until it enters the air outlet of the compressor, and it will not be like the prior art. The bypass port formed after the movable part moves divides the compression space into two parts, so that the gas in the compression space leaks out in the middle of the shell, causing the compressor to have an invalid compression work loss. In this way, compared with the prior art, the present application does not have an invalid compression work loss, and the present application can improve the efficiency of the compressor during partial unloading.

[0015] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic diagram of the structure of a compressor of certain embodiments of the present application;

[0018] Figure 2is a schematic diagram of the structure of a compressor of certain embodiments of the present application;

[0019] Figure 3 is a schematic diagram of the structure of a compressor of certain embodiments of the present application;

[0020] Figure 4 It is a structural schematic diagram of a compressor of the prior art;

[0021] Figure 5 It is a structural schematic diagram of a compressor in the prior art.

[0022] 100. Compressor;

[0023] 10. Screw; 11. Screw groove;

[0024] 20. Star wheel;

[0025] 30. Shell; 31. Fixed portion; 311. Movable groove; 32. Moving portion; 33. Air inlet; 34. Air outlet;

[0026] 40. Compress space;

[0027] 50. First driving device; 51. Cylinder; 52. Guide rod; 53. Motor; 54. Moving part. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0029] The present application provides a compressor, and the compressor of the present application is described in detail below:

[0030] See also Figures 1 to 3 The embodiment of the present application provides a compressor 100, which includes a screw 10, a star wheel 20 and a housing 30. The screw 10 is provided with a screw groove 11. The housing 30 covers the screw groove 11, and the housing 30 includes a fixed portion 31 and a movable portion 32. The fixed portion 31 and the movable portion 32 cover the screw groove 11. The fixed portion 31 is provided with a movable groove 311 connecting the air inlet and the air outlet of the compressor 100. The fixed portion 31 is also provided with a through hole. The star wheel 20 is provided with the through hole and meshes with the screw 10. The star wheel 20, the housing 30 and the screw groove 11 together enclose a compression space 40. The movable portion 32 is movably arranged in the movable groove 311, and the movable portion 32 moves to change the volume of the compression space 40.

[0031] Specifically, the compressor 100 includes an outer shell, which is a structure having a cavity (i.e., a receiving chamber) for accommodating other components. Other components of the compressor 100, such as the screw 10 and the star wheel 20, can be installed in the outer shell. The outer shell can be used to isolate the other components of the compressor 100 from the outside world to prevent the other components from being easily damaged by external forces, and to prevent external impurities, such as dust, from entering the other components and affecting the normal operation of the other components.

[0032] The shell 30 may be a part of the outer shell or a separate structure, and the shell 30 is specifically used to cover the screw groove 11 so as to form a closed space. The shell 30 includes a fixed portion 31 and a movable portion 32, and the fixed portion 31 is provided with a through hole, and the star wheel 20 can pass through the through hole and engage with the screw groove 11. In one embodiment, a through hole can be directly opened on the fixed portion 31, and the star wheel 20 passes through the through hole and engages with the screw groove 11. Or the fixed portion 31 can be divided into an upper shell and a lower shell, and the upper shell and the lower shell are used to cover the upper half and the lower half of the screw groove 11 respectively, and there is a certain gap between the upper shell and the lower shell to form a through hole, and the star wheel 20 can pass through the through hole and engage with the screw groove 11.

[0033] There are usually two star wheels 20, which are symmetrically distributed along the central axis of the screw 10. In this way, in the single-screw 10 compressor 100, the pressure at both ends of the screw 10 is the suction pressure, and these two forces offset each other, so no additional axial force is generated. At the same time, the two star wheels 20 can make the compressor 100 more stable during operation, reducing the vibration and noise caused by unbalanced axial force. Since the two star wheels 20 are symmetrically arranged on the side of the screw 10, the radial gas forces borne by the two star wheels 20 are also balanced, so that the screw 10 will not be subjected to additional radial forces during rotation, thereby reducing wear and energy loss.

[0034] The star wheel 20, the shell 30 and the screw groove 11 together enclose a compression space 40, through which the compressor 100 can compress the gas. There are usually six screw grooves 11 on the screw 10, and each star wheel 20 divides it into two upper and lower spaces, each of which realizes the working process of the compressor 100. The shell is provided with an air inlet and an air outlet, which are the air inlet and air outlet of the compressor 100. The shell 30 is provided with an air intake 33 and an air outlet 34, the air intake 33 corresponds to the air inlet of the compressor 100, and the air outlet 34 corresponds to the air outlet of the compressor 100. Now take a screw groove 11 on the screw 10 as an example to explain the working process of the compressor 100: before the teeth of the star wheel 20 are engaged, the screw groove 11 is connected to the air inlet of the compressor 100 through the air intake 33 and is in the air intake state. When the screw 10 rotates to a certain position, the teeth of the star wheel 20 close the screw groove 11 to form a compression space 40, and the air intake process ends. After the air intake process ends, the screw 10 continues to rotate, and as the teeth of the star wheel 20 advance along the screw groove 11, the closed compression space 40 gradually shrinks, realizing the gas compression process. When the compression space 40 moves to the position of the exhaust port 34, the compression space 40 is connected to the exhaust port 34 of the compressor 100, and the compression process ends at this time. The compressed gas in the compression space 40 flows out of the compressor 100 from the exhaust port 34.

[0035] The fixed portion 31 is provided with a movable groove 311 communicating with the air inlet and the air outlet of the compressor 100. The movable portion 32 is movably disposed in the movable groove 311. When the movable portion 32 is located at the initial position, it can cover the entire movable groove 311 (for example, Figure 1 ), at which time the volume of the compression space 40 is the largest. The moving portion 32 can move along the axial direction of the screw 10. When the compressor 100 needs to reduce the gas delivery, the moving portion 32 moves along the axial direction of the screw 10, in a direction away from the air inlet, to reduce the volume of the compression space 40 (for example, Figure 3 When the moving portion 32 is not located at the initial position and the compressor 100 needs to increase the air delivery volume, the moving portion 32 moves along the axial direction of the screw 10 toward the air inlet to increase the volume of the compression space 40 .

[0036] The number of the movable parts 32 may be one or more, for example, one, two or four. In one embodiment, the number of the movable parts 32 is two, and the compressor 100 can change the volume of the compression space 40 by moving the two movable parts 32. The two movable parts 32 may be located on opposite sides of the fixed part 31 and symmetrically distributed along the central axis of the fixed part 31. Alternatively, the two movable parts 32 may be located on adjacent sides of the fixed part 31. The movement between the two movable parts 32 may be associated, that is, the compressor 100 can only move the two movable parts 32 at the same time. Alternatively, the movement between the two movable parts 32 does not interfere with each other, and the compressor 100 can control the movement of the two movable parts 32 at the same time, or can control the movement of a certain movable part 32 separately. In this way, setting two movable parts 32 is conducive to improving the adjustable capacity of the volume of the compression space 40, ensuring that after the movable part 32 moves, the volume of the compression space 40 matches the gas delivery required by the compressor 100, thereby meeting the change requirements of parameters such as different compression ratios, gas types and working temperatures. It should be noted that the number of movable parts 32 is not the more the better. Too many moving parts 32 may increase the complexity and cost of the compressor 100, and may also reduce its reliability and stability. Therefore, only two moving parts 32 can make the compressor 100 more adaptable and flexible on the one hand, and ensure that the complexity and cost of the compressor 100 are not too high on the other hand, which is conducive to ensuring the reliability and stability of the compressor 100.

[0037] It can be understood that when the movable portion 32 completely covers the movable groove 311, the volume of the compression space 40 is the largest, and the gas delivery volume of the compressor 100 is the largest at this time. When the movable portion 32 moves in the direction away from the air inlet of the compressor 100, a connecting port (i.e., the area of ​​the movable groove 311 not covered by the movable portion 32) is formed between the movable portion 32 and the fixed portion 31, and the gas can freely enter and exit the connecting port, and the connecting port is located at one end of the movable groove 311 close to the air inlet of the compressor 100. When the side of the screw groove 11 coincides with the edge line of the movable portion 32, the compression space 40 can be formed in the screw groove 11, so that the volume of the total compression space 40 formed by the housing 30, the star wheel 20 and the screw groove 11 can be reduced, thereby achieving unloading of the compressor 100.

[0038] Please combine Figure 4 and Figure 5 The compressor 100 of the prior art adopts a bypass leakage method, and the movable part 32 is arranged in the middle of the shell 30. After the movable part 32 moves toward the air outlet of the compressor 100, a bypass port is formed between the movable part 32 and the shell 30. It can be understood that the bypass port is located in the middle of the shell 30. Figure 4 In the single screw 10 compressor 100, a screw groove 11, a housing 30, and a star wheel 20 are formed into a closed cavity, and at this time, the closed cavity forms a basic suction volume V0. Figure 5 In the embodiment, the movable part 32 (i.e., the unloading slide valve) disposed in the middle of the housing 30 can move along the axial direction of the screw 10 rotor to form a bypass port in the middle of the housing 30. At this time, the compressor 100 bypasses a portion of the gas with a volume of V' to the suction side, so that the final delivery volume of the compressor 100 is V1 = V0-V', thereby realizing the unloading regulation of the gas delivery volume. However, since the bypass port is located in the middle of the screw 10 rotor, the bypassed gas V' has been compressed to a certain extent, consuming a portion of the power, resulting in a loss of efficiency of the compressor 100.

[0039] The movable groove 311 of the present application connects the air outlet and the air inlet of the compressor 100, and the movable part 32 can completely cover the movable groove 311 in the initial state. After the movable part 32 moves in the direction away from the compressor 100, the connecting port is located at one end of the movable groove 311 close to the air inlet of the compressor 100, and the volume of the compression space 40 changes. The volume of the compression space 40 matches the gas delivery required by the compressor 100, and the compression space 40 will not be divided into two parts by the connecting port. Therefore, the gas entering the compression space 40 can be compressed normally until it moves to the air outlet of the compressor 100, that is to say, the compressed gas will not leak out from the connecting port halfway. Therefore, the present application will not be like the prior art, where the bypass port formed after the movable part 32 moves divides the compression space 40 into two parts, so that the gas in the compression space 40 leaks out in the middle of the shell 30. In this way, compared with the prior art, the present application does not have invalid compression work loss, and the present application can improve the efficiency of the compressor 100 when partially unloaded.

[0040] The compressor 100 of the embodiment of the present application includes a housing 30, a screw 10 and a star wheel 20, and the housing 30, the screw groove 11 on the screw 10 and the star wheel 20 enclose a compression space 40. The housing 30 includes a fixed portion 31 and a movable portion 32, and the fixed portion 31 is provided with a movable groove 311 connecting the air inlet and the air outlet of the compressor 100, and the movable portion 32 is movably arranged in the movable groove 311. After the movable portion 32 moves, the volume of the compression space 40 can be changed, and the volume of the compression space 40 matches the gas delivery required by the compressor 100. At the same time, after the movable portion 32 moves, the movable portion 32 does not cause the compression space 40 to be divided into multiple areas, and the gas entering the compression space 40 will be compressed normally until it enters the air outlet of the compressor 100, and it will not be like the prior art, the bypass port formed after the movable portion 32 moves divides the compression space 40 into two parts, so that the gas in the compression space 40 leaks out in the middle of the housing 30, resulting in the compressor 100. Ineffective compression work loss. Thus, compared with the prior art, the present application does not have invalid compression work loss, and the present application can improve the efficiency of the compressor 100 during partial unloading.

[0041] See also Figure 1 and Figure 3 In some embodiments, the compressor 100 includes a first driving device 50 , which is connected to the moving part 32 , and is used to drive the moving part 32 to move.

[0042] Specifically, a drive device refers to a device that uses driving force or energy to transmit power to various devices, thereby helping the devices to achieve functions such as movement and rotation. Common types of drive devices include motors 53, hydraulic drives, pneumatic drives, and the like.

[0043] The first driving device 50 can be connected to the moving part 32, and can drive the moving part 32 to move in a direction close to the air inlet, or in a direction away from the air inlet, so as to change the volume of the compression space 40. For example, the first driving device 50 includes a power source that generates power, and the power source and the moving part 32 are connected by a sliding rod. The power source can generate power and drive the sliding rod to move in a direction close to the air inlet, or in a direction away from the air inlet, so as to drive the moving part 32 to move in a direction close to the air inlet, or in a direction away from the air inlet, so as to change the volume of the compression space 40. At the same time, the power generated by the power source matches the current air delivery and the target air delivery of the compressor 100, so that after the moving part 32 moves, the volume of the compression space 40 matches the target air delivery of the compressor 100.

[0044] In this way, the first driving device 50 can drive the movable part 32 to move, and the power generated by the first driving device 50 matches the target air output of the compressor 100, so that the compressor 100 can control the movement of the movable part 32 in a targeted manner through the first driving device 50 to ensure that the volume of the compression space 40 after the movable part 32 moves matches the target air output of the compressor 100.

[0045] See also Figure 1 and Figure 3 In some embodiments, the first driving device 50 includes a cylinder 51 and a guide rod 52, the cylinder 51 is connected to one end of the guide rod 52, and the other end of the guide rod 52 is connected to the moving part 32, and the cylinder 51 is used to drive the guide rod 52 to move, so as to drive the moving part 32 to move toward the direction close to the air inlet or toward the direction away from the air inlet.

[0046] Specifically, the cylinder 51 is a pneumatic actuator that converts the pressure energy of compressed gas into mechanical energy in a pneumatic transmission. The two ends of the guide rod 52 are respectively connected to the output end of the cylinder 51 and the moving part 32. The output end of the cylinder 51 can drive the guide rod 52 to move toward the direction close to the air inlet, or move toward the direction away from the air inlet, so as to drive the moving part 32 to move toward the direction close to the air inlet, or move toward the direction away from the air inlet, thereby changing the volume of the compression space 40.

[0047] For example, the cylinder 51 includes a cylinder body, a piston and a piston rod. The piston is movably arranged in the cylinder 51. One end of the piston rod is connected to the piston, and the other end of the piston rod is connected to the guide rod 52. The cylinder body includes two perforations, and the two perforations correspond to the two ends of the cylinder body along the moving direction of the piston. The gas can enter the cylinder body from any perforation and leave the cylinder body from the other perforation. The perforation through which the gas enters affects the moving direction of the piston. For example, if the gas enters the cylinder body from the perforation close to the air inlet, it will push the piston to move in the direction away from the air inlet; if the gas enters the cylinder body from the perforation away from the air inlet, it will push the piston to move in the direction close to the air inlet. Therefore, the compressor 100 can control the moving direction of the piston by controlling the perforation through which the gas enters, and adjust the moving distance of the piston by adjusting the air pressure in the cylinder 51, so as to adjust the moving direction and moving distance of the piston rod, thereby adjusting the moving direction and moving distance of the moving part 32.

[0048] The gas pressure in the cylinder can be determined according to the target moving distance of the moving part 32, and the target moving distance is determined according to the target exhaust volume of the compressor 100. Assuming that the initial state of the moving part 32 is that the moving part 32 completely covers the movable groove 311, the first mapping relationship between the exhaust volume of the compressor 100 and the position of the moving part 32 is predetermined. The moving distance corresponding to the moving part 32 when the gas pressure in the cylinder is different values ​​is predetermined, thereby determining the second mapping relationship between the moving distance of the moving part 32 and the gas pressure of the cylinder. At the same time, the moving direction of the piston when the gas enters each perforation is predetermined.

[0049] In actual use, it is first possible to determine whether to increase or decrease the intake volume based on the current air delivery of the compressor 100 and the target air delivery, so as to determine the target moving direction of the piston. If the intake volume is increased, the piston needs to move in the direction close to the air inlet, and vice versa if it is reduced. Then, the position of the moving part 32 corresponding to the target air delivery and the current air delivery is determined according to the first mapping relationship. The difference between the two is the current target moving distance of the moving part 32, which is also the target moving distance of the piston. Then, the target air pressure in the cylinder body is determined according to the target moving distance and the second mapping relationship. Finally, the cylinder 51 is controlled to operate according to the target moving direction and the target air pressure, so that the piston and the piston rod can move the target moving distance along the target moving direction, so as to drive the guide rod 52 and the moving part 32 to move the target moving distance along the target moving direction in turn, so that the current air delivery of the adjusted compressor 100 is the target air delivery.

[0050] In this way, the compressor 100 can control the movement of the guide rod 52 and the movable part 32 in a targeted manner by controlling the operation of various components inside the cylinder 51, ensuring that after the movable part 32 moves, the volume of the compression space 40 matches the target air delivery, thereby ensuring that the current air delivery of the compressor 100 is the target air delivery.

[0051] See also Figure 1 and Figure 3 In some embodiments, the first driving device 50 includes a motor 53 and a moving member 54, the motor 53 is connected to the moving member 54, the moving member 54 is connected to the moving part 32, and the motor 53 is used to drive the moving member 54 to move, so as to drive the moving part 32 to move toward a direction close to the air inlet or toward a direction away from the air inlet.

[0052] Specifically, the motor 53 can convert electrical energy into mechanical energy, thereby realizing rotational motion. The output shaft of the motor 53 is connected to the moving member 54, and the moving member 54 is a device that can convert rotational motion into linear motion. For example, the moving member 54 includes a gear and a moving rod, the gear is meshed with the output shaft of the motor 53, and the gear is connected to the moving rod, and the moving rod is connected to the moving part 32. After the output shaft of the motor 53 rotates, the gear can be driven to rotate, thereby driving the moving rod to perform linear motion. The moving direction of the moving rod is the same as the axial direction of the screw 10, so when the motor 53 drives the moving rod to move through the gear, it can drive the moving part 32 to move along the axial direction of the screw 10, that is, drive the moving part 32 to move in the direction close to the air inlet or in the direction away from the air inlet.

[0053] The moving direction corresponding to the moving rod when the motor 53 rotates forward and reversely can be predetermined, and the third mapping relationship between the number of rotations of the motor 53 and the moving distance of the moving rod can be determined at the same time. It can be understood that the moving distance of the moving rod is the moving distance of the moving part 32. In actual use, it can be first determined whether to increase or decrease the intake volume based on the current air supply of the compressor 100 and the target air supply, so as to judge the target moving direction of the moving rod. If the intake volume is increased, the moving rod needs to move in the direction close to the air inlet, and if it is reduced, it is the opposite, thereby determining the target rotation direction of the motor 53. Then, the position of the moving part 32 corresponding to the target air supply and the current air supply is determined according to the first mapping relationship, and the difference between the two is the current target moving distance of the moving part 32. Then, the target number of rotations of the motor 53 is determined according to the target moving distance and the third mapping relationship. Finally, the motor 53 is controlled to operate according to the target number of rotations and the target rotation direction, so that the moving rod can be moved along the target moving direction by the target moving distance, thereby driving the moving rod and the moving part 32 to move along the target moving direction by the target moving distance in turn, so that the current gas output of the adjusted compressor 100 is the target gas output.

[0054] In this way, the compressor 100 can control the movement of the movable rod and the movable part 32 in a targeted manner by controlling the operation of the motor 53, ensuring that after the movable part 32 moves, the volume of the compression space 40 matches the target gas output, thereby ensuring that the current gas output of the compressor 100 is the target gas output.

[0055] See also Figure 1 and Figure 3In some embodiments, the compressor 100 includes a position sensor (not shown), which is used to detect the current position of the moving part 32. For example, the position sensor is an ultrasonic position sensor, which emits ultrasonic waves to the surface of the moving part 32 and measures the time or intensity of the reflected ultrasonic waves to determine the position of the object. In the case of controlling the movement of the moving part 32, the first drive device 50 only needs to determine the target position and target moving direction of the moving part 32, without determining the target moving distance of the moving part 32. Then the first drive device 50 operates according to the target moving direction to drive the moving part 32 to move along the target moving direction. During the movement, the first drive device 50 continuously obtains the detection results of the position sensor. Once it is determined that the moving part 32 has reached the target position according to the detection results of the position sensor, the first drive device 50 immediately stops running, so that the moving part 32 can accurately dock at the target position. Of course, the mobile device can also obtain the target moving distance and control the movement of the mobile unit 32 according to the target moving distance. After the movement is completed, it is determined whether the mobile unit 32 has reached the target position according to the detection result of the position sensor. If not, the mobile unit 32 continues to be controlled to move until it reaches the target position.

[0056] In this way, the compressor 100 can use the position sensor to ensure that the moving part 32 can accurately reach the target position after stopping moving, and ensure that the volume of the compression space 40 matches the target gas output after the moving part 32 stops moving, thereby ensuring that the current gas output of the compressor 100 is the target gas output.

[0057] See also Figure 1 In some embodiments, the compressor 100 includes a second driving device, which is connected to the screw 10, and is used to drive the screw 10 to rotate and change the speed of the screw 10. For example, the second driving device is a motor, and the output end of the motor is connected to the screw 10. After the motor starts to rotate, it can drive the screw 10 to rotate. At the same time, the speed of the motor is adjustable, so that the compressor 100 can adjust the speed of the screw 10 by adjusting the speed of the motor.

[0058] The speed of the screw 10 determines the number of times the screw rotor rotates per unit time, which in turn affects the frequency at which the gas is compressed and discharged. Therefore, there is a direct relationship between the speed of the screw 10 and the gas output of the compressor 100. Generally speaking, the higher the speed of the screw 10, the greater the amount of gas that the compressor 100 can compress and discharge per unit time, that is, the gas output increases.

[0059] Therefore, when adjusting the gas delivery volume, the compressor 100 can drive the moving part 32 to move through the first driving device 50, and at the same time adjust the rotation speed of the screw 10 through the second driving device, so as to use the rotation speed of the screw 10 to assist in adjusting the gas delivery volume of the compressor 100, and ensure that the first driving device 50 and the second driving device are running, thereby ensuring that the current gas delivery volume of the compressor 100 is the target gas delivery volume.

[0060] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0061] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0062] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A compressor, characterized in that: include: A screw rod, wherein the screw rod is provided with a screw groove; Star wheel; A shell, the shell covers the screw groove, the shell includes a fixed part and a movable part, the fixed part and the movable part cover the screw groove, the fixed part is provided with a movable groove connecting the air inlet and the air outlet of the compressor, the fixed part is also provided with a through hole, the star wheel passes through the through hole and meshes with the screw, the star wheel, the shell and the screw groove together enclose a compression space, the movable part is movably arranged in the movable groove, and the movable part moves to change the volume of the compression space.

2. The compressor according to claim 1, characterized in that The moving part moves along the axial direction of the screw, and when the compressor needs to reduce the air delivery volume, the moving part moves in a direction away from the air inlet.

3. The compressor according to claim 1, characterized in that The compressor includes a first driving device connected to the moving part, and the first driving device is used to drive the moving part to move.

4. The compressor according to claim 3, characterized in that The first driving device includes a cylinder and a guide rod, wherein the cylinder is connected to one end of the guide rod, and the other end of the guide rod is connected to the moving part. The cylinder is used to drive the guide rod to move, so as to drive the moving part to move toward a direction close to the air inlet or toward a direction away from the air inlet.

5. The compressor according to claim 4, characterized in that The cylinder comprises a cylinder body, a piston and a piston rod. The piston is movably arranged in the cylinder. One end of the piston rod is connected to the piston, and the other end of the piston rod is connected to the guide rod.

6. The compressor according to claim 3, characterized in that The first driving device includes a motor and a moving member, the motor is connected to the moving member, the moving member is connected to the moving part, and the motor is used to drive the moving member to move so as to drive the moving part to move toward a direction close to the air inlet or toward a direction away from the air inlet.

7. The compressor according to claim 1, characterized in that The compressor includes a position sensor for detecting a current position of the moving part.

8. The compressor according to claim 1, characterized in that The compressor comprises a second driving device, which is connected to the screw rod and is used to drive the screw rod to rotate and to change the rotation speed of the screw rod.

9. The compressor according to claim 1, characterized in that There are two star wheels, and the two star wheels are symmetrically distributed along the central axis of the screw.

10. The compressor according to claim 1 or 9, characterized in that: There are two moving parts.

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