A twin screw compressor stepless capacity and volume ratio regulating device and its control method

Abstract

This invention relates to the field of twin-screw compressor technology, providing a device and control method for adjusting the energy level and internal volume ratio of a twin-screw compressor using only a single drive source. The device includes a threaded rod driven by a servo reducer, an energy level slide valve, an internal volume ratio slide valve, and a slide valve clutch controlled by a clutch drive motor. By engaging and disengaging the slide valve clutch, the energy level slide valve and the internal volume ratio slide valve can be selectively linked or operated independently. The control method, based on a calibrated functional relationship between the slide valve position and the energy level percentage and internal volume ratio, accurately calculates and inputs the number of pulses to the servo reducer, achieving precise control of the two slide valves. This invention replaces the traditional dual-oil circuit system with a single servo reducer and clutch mechanism, solving the problems of poor adjustment accuracy and slow response of hydraulic drives. Simultaneously, it maintains full energy level load when adjusting the internal volume ratio, avoiding COP drop due to load reduction, thus improving the compressor's control accuracy and energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of twin-screw compressor technology, and more particularly to a twin-screw compressor energy level and internal volume ratio adjustment device and control method thereof. Background Technology

[0002] In the fields of industrial refrigeration and process gas compression, twin-screw compressors have become core power components for large-scale commercial refrigeration, industrial heat pumps, gas transmission, and central air conditioning systems due to their significant advantages such as simple structure, stable operation, low failure rate, wide cooling capacity range, and flexible capacity adjustment. In the operation and control of twin-screw compressors, energy level regulation (i.e., gas delivery volume regulation) and internal volume ratio regulation (i.e., internal pressure ratio matching) are two key functions that determine whether the compressor unit can maintain efficient operation under varying operating conditions. The energy level valve adjusts the compressor's input volume flow rate by changing the effective working length of the rotor, while the internal volume ratio valve (Vi valve) adjusts the size of the radial discharge port to match the final compression pressure with the back pressure at the discharge port, thereby avoiding efficiency losses caused by over-compression or under-compression.

[0003] Currently, in existing twin-screw compressor products, the driving and control of the two slide valves mentioned above are usually achieved using a hydraulic system. A typical solution utilizes the difference between the compressor's own discharge and suction pressures as a power source, driving the energy level slide valve and the Vi slide valve through two independent hydraulic circuit systems (including cylinders, pistons, guide rods, and solenoid directional valves). With the increasing urgency for energy conservation, emission reduction, and high-quality green development, the inherent limitations of traditional twin-screw compressor energy level and internal volume ratio adjustment technology based on hydraulic circuit systems are becoming increasingly apparent: First, the movement speed of traditional hydraulic pistons largely depends on the operating pressure difference. When unloading operations are performed under low pressure difference conditions, the energy level slide valve faces difficulties in unloading and exhibits response lag due to high-pressure discharge resistance. Second, due to the nonlinear characteristics of hydraulic systems and the incompressibility of hydraulic fluid, the slide valve often cannot be precisely positioned in one operation, typically requiring multiple "over-adjustment and back-off" correction processes to achieve the ideal state. Furthermore, carbon deposits or metal wear particles generated during hydraulic system operation can contaminate the hydraulic fluid, posing a risk of blockage in the hydraulic circuit or solenoid valve, or piston jamming.

[0004] Therefore, there is a need in this field for an innovative device and control method for regulating the energy level and internal volume ratio of a twin-screw compressor, so as to achieve high-precision and fast-response control of the energy level slide valve and internal volume ratio slide valve of the twin-screw compressor. Summary of the Invention

[0005] To address the technical problems of traditional hydraulic circuit-based regulating devices, such as slow response, inaccurate positioning, and susceptibility to oil contamination affecting stability, this invention provides a twin-screw compressor energy level and internal volume ratio regulating device and its control method. This invention primarily utilizes a mechanical coupling structure and a collaborative control strategy, employing only a single drive source to achieve collaborative control of the two valves, enabling the energy level valve and the internal volume ratio valve to operate in tandem as needed.

[0006] The technical means employed in this invention are as follows:

[0007] A device for regulating the energy level and internal volume ratio of a twin-screw compressor includes a drive assembly, a slide valve assembly, a clutch assembly, and a housing assembly; The drive assembly includes a servo reducer, a coupling, and a threaded rod, wherein the threaded rod is driven by the servo reducer via the coupling. The slide valve assembly includes an energy level slide valve and an internal volume ratio slide valve. One end of the threaded rod is connected to the energy level slide valve. The energy level slide valve is located at the exhaust end and has a radial exhaust port. The clutch assembly includes a spool valve clutch, a clutch drive motor, and a transmission sleeve. The spool valve clutch is connected to the energy level spool valve. The spool valve clutch is driven by the clutch drive motor through the transmission sleeve. The clutch drive motor enables the spool valve clutch to switch between an engaged state and a disengaged state. The housing assembly includes an intake end cover, an intake end bearing seat, a slide valve seat, and an exhaust end bearing seat. The clutch drive motor is located inside the intake end cover, the transmission sleeve is located inside the intake end bearing seat, the slide valve assembly is located in the slide valve seat, and the threaded rod is located inside the exhaust end bearing seat.

[0008] Furthermore, the internal volume ratio slide valve is provided with a track that allows the slide valve clutch to move axially.

[0009] Furthermore, the slide valve clutch is provided with a stop block, and the clutch drive motor drives the stop block to rotate, so that it is aligned with or deviates from the track, thereby realizing the switching of the engagement and disengagement states of the internal volume ratio slide valve and the energy level slide valve.

[0010] Furthermore, the transmission sleeve is provided with space for the axial movement of the slide valve clutch.

[0011] Furthermore, the clutch drive motor is a high-torque servo motor.

[0012] Furthermore, the slide valve clutch is connected to the energy level slide valve via bearings, bearing caps, and round nut components.

[0013] Furthermore, the threaded rod is fixed by a bearing, a bearing cap, and a round nut on the exhaust end bearing seat; the transmission sleeve is fixed by bearings, round nuts, and elastic retaining rings arranged at both ends on the intake end bearing seat.

[0014] This invention also provides a method for controlling the energy level and internal volume ratio of a twin-screw compressor, comprising the following steps: When it is necessary to adjust the internal volume ratio, the clutch drive motor drives the slide valve clutch to rotate to the engaged position, so that the internal volume ratio slide valve and the energy level slide valve are in a linked state. The servo reducer drives the two slide valves to move synchronously to the exhaust end or the intake end through the threaded rod, so as to realize the adjustment of increasing or decreasing the internal volume ratio, and maintain the compressor at full load during this process. When the energy level needs to be adjusted, the clutch drive motor drives the slide valve clutch to rotate to the disengaged position, so that the internal volume ratio slide valve is disengaged from the energy level slide valve. The servo reducer drives the energy level slide valve to move independently to the exhaust end or intake end through the threaded rod, so as to realize the adjustment of the energy level by unloading or loading. The position of the internal volume ratio slide valve remains unchanged.

[0015] Furthermore, when adjusting the volume ratio, the PLC program reads the real-time data from the linear displacement sensor of the volume ratio slide valve. Based on the calibrated functional relationship between the axial position of the volume ratio slide valve and the volume ratio value, the displacement difference between the current slide valve position and the target position is calculated. Then, combined with the reduction ratio of the servo reducer and the lead parameter of the threaded rod, the displacement difference is converted into the number of rotations and direction required by the servo reducer. Control commands are generated to drive the servo reducer to move and provide real-time feedback for adjustment until the target position is reached.

[0016] Furthermore, when adjusting the energy level, the PLC program reads the real-time data from the linear displacement sensors of the two slide valves, calculates the current energy level percentage of the compressor based on the gap value between the two slide valves, converts the difference between the target energy level percentage and the current energy level percentage into the distance that the energy level slide valve needs to move, and then, in combination with the reduction ratio of the servo reducer and the lead parameter of the threaded rod, converts this distance into the number of rotations and direction required by the servo reducer, generates control commands to drive the servo reducer to move, and provides real-time feedback and adjustment until the target energy level is reached.

[0017] Compared with the prior art, the present invention has the following advantages: The adjustment accuracy and response speed of the compressor internal volume ratio and energy level in this application are no longer constrained by the operating conditions. Even under small pressure difference conditions or when the pressure difference is not fully established, the device and control method of this invention can still achieve precise adjustment of the internal volume ratio and compressor load, avoiding the over-adjustment-reverse correction steps in the traditional hydraulic oil circuit slide valve control system, and significantly improving the dynamic control quality of the compressor under changing operating conditions.

[0018] This invention achieves coordinated control of two spool valves using only one drive source through a mechanical coupling structure and a coordinated control strategy, enabling the energy level spool valve and the internal volume ratio spool valve to be linked as needed. When adjusting the internal volume ratio, it can maintain the tight fit of the contact surfaces of the two spool valves, keeping the compressor at full load, and avoiding the bypass unloading problem caused by the separation of the two spool valves due to the uncoordinated action of the two hydraulic circuit systems in the traditional method. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of the overall structure of the present invention; Figure 2 This is a flowchart of the product ratio adjustment control of the present invention; Figure 3 This is a cross-sectional view of the compressor when the internal volume ratio is at its minimum and the energy level is fully loaded, according to the present invention. Figure 4 This is a diagram showing the position of the valve clutch when the product ratio valve and the energy level valve are in the engaged state, as described in this invention. Figure 5 This is a cross-sectional view of the compressor when the internal volume ratio is at its maximum and the energy level is fully loaded. Figure 6 This is a flowchart of the energy level regulation and control process of the present invention; Figure 7 This is a diagram showing the position of the valve clutch when the product ratio valve and the energy level valve are in a separated state, as described in this invention. Figure 8 This is a cross-sectional view of the compressor when the volume ratio is at its minimum and the energy level is 50%.

[0021] In the diagram: 1. Servo reducer; 2. Coupling; 3. Threaded rod; 4. Energy level slide valve; 5. Internal volume ratio slide valve; 6. Slide valve clutch; 7. Transmission sleeve; 8. Clutch drive motor; 9. Intake end cover; 10. Intake end bearing seat; 11. Slide valve seat; 12. Exhaust end bearing seat. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0026] This invention provides a device for adjusting the energy level and internal volume ratio of a twin-screw compressor, such as... Figure 1 As shown, it includes: a drive assembly, a spool valve assembly, a clutch assembly, and a housing assembly.

[0027] The drive assembly consists of a servo reducer 1, a coupling 2, and a threaded rod 3. The threaded rod 3 is driven by the servo reducer 1 through the coupling 2. The slide valve assembly includes an energy level slide valve 4 and an internal volume ratio slide valve 5. A threaded rod 3 is connected to the energy level slide valve 4. The energy level slide valve 4 is located at the exhaust end and has a radial exhaust port. The internal volume ratio slide valve 5 is provided with a track for the axial movement of the slide valve clutch 6. The clutch assembly includes a spool clutch 6, a clutch drive motor 8, and a transmission sleeve 7. The spool clutch 6 is connected to the energy level spool valve 4. The transmission sleeve 7 has space for the spool clutch 6 to move axially. The spool clutch 6 is driven by the clutch drive motor 8 through the transmission sleeve 7. The clutch drive motor 8 can switch the spool clutch 6 between the engaged and disengaged states. The spool clutch 6 is provided with a stop block. The clutch drive motor 8 drives the stop block to rotate, so that it is aligned or deviated from the track, thereby realizing the switching between the engaged and disengaged states of the internal volume ratio spool valve 5 and the energy level spool valve 4. The housing assembly consists of an intake end cover 9, an intake end bearing seat 10, a slide valve seat 11, and an exhaust end bearing seat 12. The clutch drive motor 8 is placed inside the intake end cover 9, the transmission sleeve 7 is placed inside the intake end bearing seat 10, the slide valve assembly is placed in the slide valve seat 11, and the threaded rod 3 is placed inside the exhaust end bearing seat 12. Preferably, the clutch drive motor 8 is a high-torque servo motor; as another preferred option, the servo reducer 1 uses a 110 series motor, and the reducer is a single-stage planetary reducer with a 5:1 gear ratio, which has a braking function and includes a driver, encoder and other control units; the coupling 2 is a cross-slider coupling that can withstand large torque; the threaded rod 3 is a ball screw. The axial and radial loads of the slide valve clutch 6 are borne by the rolling bearings mounted on the energy level slide valve 4, and the inner ring of the rolling bearing is locked by a round nut, while the outer ring is fixed by a bearing cap.

[0028] The axial and radial loads of the threaded rod 3 are borne by angular contact ball bearings mounted opposite each other on the exhaust end bearing housing 12, and the inner ring of the angular contact ball bearing is locked by a round nut, while the outer ring is fixed by a bearing cap.

[0029] The axial and radial loads of the transmission sleeve 7 are borne by the deep groove ball bearings installed at both ends of the intake bearing housing 10. The inner ring of the left deep groove ball bearing is locked by a round nut, and the outer ring is fixed by the intake end cover. The inner ring of the right deep groove ball bearing is locked by a round nut, and the outer ring is fixed by an elastic retaining ring.

[0030] A control method for adjusting the energy level and internal volume ratio of a twin-screw compressor includes the following steps: When the internal volume ratio of the compressor is increased, the clutch drive motor 8 drives the slide valve clutch 6 to rotate a certain angle through the transmission sleeve 7 so that the internal volume ratio slide valve 5 and the energy level slide valve 4 are in a linked state. The servo reducer 1 drives the energy level slide valve 4 and the internal volume ratio slide valve 5 to move synchronously to the exhaust end through the coupling 2 and the threaded rod 3, so as to realize the adjustment of the internal volume ratio of the screw compressor. When the internal volume ratio of the compressor is reduced, the slide valve clutch 6 keeps the internal volume ratio slide valve 5 and the energy level slide valve 4 in contact, changes the rotation direction of the servo reducer 1, and drives the energy level slide valve 4 and the internal volume ratio slide valve 5 to move synchronously toward the suction end, thereby realizing the reduction adjustment of the internal volume ratio of the screw compressor. During the process of increasing or decreasing the internal volume ratio, the two slide valves remain in contact and move synchronously, and the compressor can maintain a full-load state.

[0031] When the compressor is unloaded, the clutch drive motor 8 drives the slide valve clutch 6 to rotate a certain angle through the transmission sleeve 7, so that the internal volume ratio slide valve 5 is disengaged from the energy level slide valve 4. The internal volume ratio slide valve 5 does not move with the energy level slide valve 4. The servo reducer 1 drives the energy level slide valve 4 to move towards the exhaust end through the coupling 2 and the threaded rod 3, thereby realizing the energy level unloading of the screw compressor. When the compressor is partially loaded, the clutch drive motor 8 does not operate, and the internal volume ratio slide valve 5 and the energy level slide valve 4 remain relatively independent. The servo reducer 1 drives the energy level slide valve 4 to move towards the suction end only through the coupling 2 and the threaded rod 3, thereby realizing the energy level loading function of the screw compressor.

[0032] Please see Figures 2 to 5 Based on the control method of the content product ratio adjustment device in this embodiment, it is implemented according to the following steps: Step 1: The PLC program determines whether the two valves are engaged based on the real-time data from the linear displacement sensors of the volume ratio valve 5 and the energy level valve 4. If the two valves are engaged, a rotation command is sent to the clutch drive motor 8 to rotate the stop block on the valve clutch 6 to a specific "engagement position" (such as 0° position), so that the volume ratio valve 5 can move synchronously with the energy level valve 4. If the two valves are currently disengaged, an overload command needs to be executed before the above operation is performed. Step 2: Manually input the required volume ratio (Vi) value on the PLC control panel, or click the "Automatic Match Vi" button so that the program can calculate the optimal target volume ratio value based on the external pressure ratio corresponding to the current operating conditions (such as evaporation temperature and condensation temperature) and the conversion formula between internal pressure ratio and volume ratio built into the program.

[0033] Step 3: The PLC program reads the real-time data from the linear displacement sensor of the volume ratio slide valve 5. Based on the functional relationship between the axial position of the volume ratio slide valve 5 and the volume ratio value calibrated in the program, it calculates the displacement difference (ΔL) between the current position and the target position of the slide valve. Subsequently, combined with parameters such as the reduction ratio of the servo reducer 1 and the lead of the threaded rod 3, the linear displacement difference is converted into the theoretical number of clockwise (increasing Vi) or counterclockwise (decreasing Vi) rotations required by the servo reducer 1, and finally outputs the number of pulses to generate the action command.

[0034] Step 4: After receiving the instruction, the driver drives the servo geared motor to rotate according to the preset speed curve, and drives the threaded rod 3 to rotate through the coupling 2, thereby pushing the internal volume ratio slide valve 5 to move to the target position.

[0035] Step 5: The PLC program reads the real-time value of the linear displacement sensor of the volume ratio slide valve 5 again, compares the actual position with the theoretical target position, and if it detects that the error exceeds the set threshold due to mechanical clearance or load fluctuation, the PLC will dynamically adjust the output command to fine-tune and compensate the servo reducer 1 until the error is within the threshold. Step 6: When the slide valve reaches the target position, the PLC determines that the volume ratio adjustment is complete, the servo reducer 1 stops running, and then closes the electromagnetic brake to lock the slide valve at the target position.

[0036] Please see Figures 6 to 8 The control method of the energy level regulation device in this embodiment of the invention is implemented according to the following steps: Step 1: The PLC control program determines whether the compressor is in full load state based on the real-time data of the linear displacement sensors of the two slide valves. If the compressor is currently in full load state, it sends a rotation command to the clutch drive motor 8 to drive the slide valve clutch 6 stop block to rotate to a specific "disengagement position" (such as 90° position). At this time, the slide valve clutch 6 stop block can move axially along the track in the internal volume ratio slide valve 5, and the mechanical binding between the energy level slide valve 4 and the internal volume ratio slide valve 5 is released. If the compressor is currently in a partial load state, the clutch drive motor 8 does not need to operate. Step 2: Manually input the target energy level percentage in the PLC control panel; Step 3: The PLC program reads the real-time data from the linear displacement sensors of the two slide valves, calculates the current energy level percentage of the compressor based on the gap value between the two slide valves, and converts the difference between the target energy level percentage and the current energy level percentage into the distance that the energy level slide valve 4 needs to move in the positive axial direction (load increase) or negative axial direction (load decrease). Combining the reduction ratio of the servo reducer 1, the lead of the threaded rod 3, and other parameters, the linear displacement value is converted into the theoretical number of rotations required by the servo reducer motor, and finally outputs the number of pulses to generate the action command.

[0037] Step 4: After receiving the command, the driver drives the servo reducer 1 to rotate according to the preset speed curve, and drives the threaded rod 3 to rotate through the coupling 2, thereby pushing the energy level slide valve 4 to move to the target position.

[0038] Step 5: The PLC program reads the real-time data from the linear displacement sensors of the two slide valves again, calculates the current energy level percentage of the compressor based on the gap value between the two slide valves, compares the adjusted actual energy level with the theoretical target energy level, and if the energy level error is detected to exceed the set threshold, the PLC will dynamically adjust the output command to fine-tune and compensate the servo reducer 1 until the energy level error is within the threshold range. Both slide valve linear displacement sensors are mounted on the slide valve seats.

[0039] Step 6: When the energy level reaches the target value, the PLC determines that the energy level adjustment is complete, the servo reducer 1 stops running, and then the electromagnetic brake is closed to lock the slide valve at the target position.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for adjusting the energy level and internal volume ratio of a twin-screw compressor, characterized in that, Includes drive assembly, spool valve assembly, clutch assembly, and housing assembly; The drive assembly includes a servo reducer, a coupling, and a threaded rod, wherein the threaded rod is driven by the servo reducer via the coupling. The slide valve assembly includes an energy level slide valve and an internal volume ratio slide valve. One end of the threaded rod is connected to the energy level slide valve. The energy level slide valve is located at the exhaust end and has a radial exhaust port. The clutch assembly includes a spool valve clutch, a clutch drive motor, and a transmission sleeve. The spool valve clutch is connected to the energy level spool valve. The spool valve clutch is driven by the clutch drive motor through the transmission sleeve. The clutch drive motor enables the spool valve clutch to switch between an engaged state and a disengaged state. The housing assembly includes an intake end cover, an intake end bearing seat, a slide valve seat, and an exhaust end bearing seat. The clutch drive motor is located inside the intake end cover, the transmission sleeve is located inside the intake end bearing seat, the slide valve assembly is located in the slide valve seat, and the threaded rod is located inside the exhaust end bearing seat.

2. The twin-screw compressor energy level and internal volume ratio adjustment device according to claim 1, characterized in that, The internal volume ratio slide valve is provided with a track that allows the slide valve clutch to move axially.

3. The twin-screw compressor energy level and internal volume ratio adjustment device according to claim 2, characterized in that, The slide valve clutch is provided with a stop block. The clutch drive motor drives the stop block to rotate, so that it is aligned with or deviates from the track, thereby realizing the switching between the engagement and disengagement states of the internal volume ratio slide valve and the energy level slide valve.

4. The twin-screw compressor energy level and internal volume ratio adjustment device according to claim 1, characterized in that, The transmission sleeve is provided with space for the axial movement of the slide valve clutch.

5. The twin-screw compressor energy level and internal volume ratio adjustment device according to claim 1, characterized in that, The clutch drive motor is a high-torque servo motor.

6. The twin-screw compressor energy level and internal volume ratio adjustment device according to claim 1, characterized in that, The slide valve clutch is connected to the energy level slide valve through bearings, bearing caps, and round nuts.

7. The twin-screw compressor energy level and internal volume ratio adjustment device according to claim 1, characterized in that, The threaded rod is fixed by the bearing, bearing cap and round nut on the exhaust end bearing seat; the transmission sleeve is fixed by the bearing, round nut and elastic retaining ring arranged at both ends on the intake end bearing seat.

8. A method for controlling the energy level and internal volume ratio of a twin-screw compressor, implemented based on the twin-screw compressor energy level and internal volume ratio adjustment device according to any one of claims 1-7, characterized in that, Includes the following steps: When it is necessary to adjust the internal volume ratio, the clutch drive motor drives the slide valve clutch to rotate to the engaged position, so that the internal volume ratio slide valve and the energy level slide valve are in a linked state. The servo reducer drives the two slide valves to move synchronously to the exhaust end or the intake end through the threaded rod, so as to realize the adjustment of increasing or decreasing the internal volume ratio, and maintain the compressor at full load during this process. When the energy level needs to be adjusted, the clutch drive motor drives the slide valve clutch to rotate to the disengaged position, so that the internal volume ratio slide valve is disengaged from the energy level slide valve. The servo reducer drives the energy level slide valve to move independently to the exhaust end or intake end through the threaded rod, so as to realize the adjustment of the energy level by unloading or loading. The position of the internal volume ratio slide valve remains unchanged.

9. The method for controlling the energy level and internal volume ratio of a twin-screw compressor according to claim 8, characterized in that, When adjusting the volume ratio, the PLC program reads the real-time data from the linear displacement sensor of the volume ratio slide valve. Based on the calibrated functional relationship between the axial position of the volume ratio slide valve and the volume ratio value, the displacement difference between the current slide valve position and the target position is calculated. Then, combined with the reduction ratio of the servo reducer and the lead parameter of the threaded rod, the displacement difference is converted into the number of rotations and direction required by the servo reducer. Control commands are generated to drive the servo reducer to move and provide real-time feedback and adjustment until the target position is reached.

10. The method for controlling the energy level and internal volume ratio of a twin-screw compressor according to claim 8, characterized in that, When adjusting the energy level, the PLC program reads the real-time data from the linear displacement sensors of the two slide valves, calculates the current energy level percentage of the compressor based on the gap value between the two slide valves, converts the difference between the target energy level percentage and the current energy level percentage into the distance that the energy level slide valve needs to move, and then, in combination with the reduction ratio of the servo reducer and the lead parameter of the threaded rod, converts this distance into the number of rotations and direction required by the servo reducer, generates control commands to drive the servo reducer to move, and provides real-time feedback and adjustment until the target energy level is reached.

Images