Compression device

Abstract

The utility model provides a compression device. The compression device comprises a machine body, a screw compression set, a volume adjusting set, a driving set and a control module. The body has a suction end and an exhaust end opposite to the suction end. The screw compression set is arranged in the machine body. And the volume adjusting group is arranged in the machine body corresponding to the screw compression group. The driving group is coupled to the volume adjusting group and is used for driving the volume adjusting group to adjust the volume ratio. The control module is electrically connected to the driving group and is used for detecting the running states of the front and back time sequences and recording the running states as corresponding evaluation indexes. Based on the comparison result of the evaluation indexes of the front-back time sequence, the control module controls the driving group to drive the volume adjusting group to adjust the volume ratio. The compression device provided by the utility model is beneficial to improving the performance of the compression device.

Description

Technical Field

[0001] This utility model relates to a compression device. Background Technology

[0002] Common screw compressors typically have two control valves installed on their hydraulic lines. By controlling the opening and closing of these valves, the slider within the compression chamber can be moved to slide forward or backward, adjusting the volume ratio through changes in the slider's position. Specifically, when the slider slides to the position that meets the required discharge capacity, the volume ratio is fixed. However, this fixed volume ratio may not be the optimal value for real-time operating conditions, potentially leading to under-compression or over-compression. This results in excessive energy consumption by the screw compressor, affecting its performance. Utility Model Content

[0003] This invention relates to a compression device that helps improve the performance of the compression device.

[0004] According to one embodiment of this utility model, the compression device includes a body, a screw compressor assembly, a volume adjustment assembly, a drive assembly, and a control module. The body has an intake end and an exhaust end relative to the intake end. The screw compressor assembly is disposed within the body. The volume adjustment assembly is disposed within the body corresponding to the screw compressor assembly. The drive assembly is coupled to the volume adjustment assembly and is used to drive the volume adjustment assembly to adjust the volume ratio. The control module is electrically connected to the drive assembly and is used to detect the operating status before and after the specified time sequence and record it as corresponding evaluation indicators. Based on the comparison results of the evaluation indicators before and after the specified time sequence, the control module controls the drive assembly to drive the volume adjustment assembly to adjust the volume ratio.

[0005] In an embodiment of this utility model, the control module is used to: receive a start command; set an adjustment flag to a preset flag value; record the previous evaluation index; execute judgment and adjustment steps, including waiting for a preset time; record the current evaluation index; determine whether the current evaluation index meets preset conditions compared to the previous evaluation index; if it meets the preset conditions, the adjustment flag is maintained at the preset flag value; if it does not meet the preset conditions, the adjustment flag is set to a reverse flag value; and determine whether the adjustment flag is the preset flag value; if it is, adjust in the same direction as the preset flag value; if not, reduce the adjustment in the opposite direction to the preset flag value; and update the previous evaluation index, and repeatedly execute the judgment and adjustment steps.

[0006] In an embodiment of this utility model, the control module is further configured to: determine whether the current evaluation index meets the preset conditions compared to the previous evaluation index, and then determine whether the number of same-direction adjustments is less than the preset number; if the number of same-direction adjustments is less than the preset number, then update the number of same-direction adjustments; and if the number of same-direction adjustments is greater than or equal to the preset number, then set the adjustment flag to the reverse flag value and reset the number of same-direction adjustments to zero.

[0007] In an embodiment of this utility model, the number of times the same direction adjustment is updated is the number of times the same direction adjustment is increased by one.

[0008] In an embodiment of this utility model, updating the previous evaluation index means replacing the previous evaluation index with the current evaluation index.

[0009] In embodiments of this utility model, the previous evaluation index and the current evaluation index include current, power, or performance characteristics.

[0010] In an embodiment of this utility model, the preset condition is that the current evaluation index is better than or equal to the previous evaluation index.

[0011] In embodiments of this utility model, the current evaluation index being better than or equal to the previous evaluation index includes the current operating current being lower than or equal to the previous operating current, the current power consumption being lower than or equal to the previous power consumption, or the current performance being better than or equal to the previous performance.

[0012] In an embodiment of this utility model, the volume adjustment group includes a piston coupled to the drive group and a slider connected to the piston, and the slider is disposed on one side of the screw compression group. The piston is used to drive the slider to slide towards the intake end or towards the exhaust end.

[0013] In an embodiment of this utility model, the drive assembly includes a first oil passage and a second oil passage coupled to the piston member. When the control module opens the first oil passage and closes the second oil passage, the piston member slides towards the intake end. When the control module opens the second oil passage and closes the first oil passage, the piston member slides towards the exhaust end.

[0014] In an embodiment of this utility model, the volume adjustment group includes a screw coupled to the drive group and a slider coupled to the screw, and the slider is disposed on one side of the screw compression group. The screw is used to drive the slider to slide towards the intake end or towards the exhaust end.

[0015] In an embodiment of this utility model, the drive assembly includes a motor, and the screw is coupled to the motor. When the control module controls the motor to drive the screw to rotate around a first rotation direction, the screw drives the slider to slide towards the intake end. When the control module controls the motor to drive the screw to rotate around a second rotation direction opposite to the first rotation direction, the screw drives the slider to slide towards the exhaust end.

[0016] Based on the above, the compression device and its volume ratio control method proposed in this utility model can continuously determine the direction of increase or decrease in volume ratio during the operation of the compression device by comparing evaluation indicators (such as operating current, power consumption, or performance) before and after the compression device, and control the increase or decrease of volume ratio so that the volume ratio after real-time adjustment is the optimal value that conforms to or is close to the real-time operating conditions. In addition, in the control process of this utility model, the current real operating conditions can be reflected in real time, and the control module can control the volume adjustment group to quickly approach the optimal value of the real-time operating conditions, so that the performance of the compression device can conform to the current optimal operating conditions. At the same time, it can reduce the number of detection devices and the number of signals processed by the control module, thereby simplifying the control logic and improving the control sensitivity, significantly improving the situation of excessive energy consumption of the compression device, and significantly improving the performance of the compression device.

[0017] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a compression device according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic flowchart of a method for controlling the volume ratio of a compression device according to an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional schematic diagram of a compression device according to another embodiment of the present invention;

[0021] Figure 4 This is a flowchart illustrating a method for controlling the volume ratio of a compression device according to another embodiment of the present invention. Detailed Implementation

[0022] Figure 1 This is a cross-sectional schematic diagram of a compression device according to an embodiment of this utility model. Please refer to it. Figure 1In this embodiment, the compression device 100 can be a variable volume ratio screw compression device, and includes a body 110, a screw compression assembly 120, a volume adjustment assembly 130, a drive assembly 140, and a control module 200. Specifically, the body 110 has an intake end 111 and an exhaust end 112, wherein the screw compression assembly 120 is disposed within the compression chamber 113 of the body 110, and is located between the intake end 111 and the exhaust end 112. The screw compression assembly 120 can compress the fluid introduced into the compression chamber 113 from the intake end 111, and then the compressed fluid is discharged from the compression chamber 113 and finally exited from the exhaust end 112.

[0023] The volume adjustment assembly 130 is disposed within the machine body 110, corresponding to the screw compressor assembly 120. The volume adjustment assembly 130 may include a piston 131 and a slider 132 connected to the piston 131. The piston 131 is disposed within the piston chamber of the machine body 110 and reciprocates within the piston chamber. Conversely, the slider 132 is disposed on one side of the screw compressor assembly 120 and is adapted to slide synchronously with the piston 131. When the piston 131 drives the slider 132 to slide towards the intake end 111 or the exhaust end 112, the position of the radial exhaust port of the slider 132 changes, thereby adjusting the volume ratio.

[0024] Furthermore, when the piston 131 drives the slider 132 to slide towards the intake end 111, the distance between the radial exhaust port of the slider 132 and the intake end 111 is shortened, thereby shortening the stroke of the screw compressor assembly 120 in compressing the fluid, resulting in a decrease in exhaust pressure and volume ratio. Conversely, when the piston 131 drives the slider 132 to slide towards the exhaust end 112, the distance between the radial exhaust port of the slider 132 and the intake end 111 is increased, thereby increasing the stroke of the screw compressor assembly 120 in compressing the fluid, resulting in an increase in exhaust pressure and volume ratio.

[0025] like Figure 1 As shown, the drive group 140 is coupled to the volume adjustment group 130 to drive the volume adjustment group 130 to adjust the volume ratio. On the other hand, the control module 200 is electrically connected to the drive group 140 to control the drive group 140 to drive the volume adjustment group 130 to adjust the volume ratio. In this embodiment, the drive group 140 includes a first oil passage 141 and a second oil passage 142 coupled to the piston member 131, wherein the first oil passage 141 and the second oil passage 142 are both connected to the piston chamber where the piston member 131 is located, and are respectively used to perform oil injection or oil discharge operations on the piston member 131.

[0026] When the control module 200 opens the first oil passage 141 and closes the second oil passage 142, the first oil passage 141 injects oil into the piston 131, pushing the piston 131 towards the intake end 111. Conversely, when the control module 200 opens the second oil passage 142 and closes the first oil passage 141, the second oil passage 142 discharges oil from the piston 131, carrying the piston 131 towards the exhaust end 112.

[0027] Furthermore, the first oil circuit 141 includes a first control valve 141a and a first pipeline 141b, wherein the first control valve 141a is disposed on the first pipeline 141b and is used to open or close the first pipeline 141b. On the other hand, the second oil circuit 142 includes a second control valve 142a and a second pipeline 142b, wherein the second control valve 142a is disposed on the second pipeline 142b and is used to open or close the second pipeline 142b.

[0028] like Figure 1 As shown, the control module 200 is electrically connected to the first control valve 141a and the second control valve 142a to control the opening or closing of the first control valve 141a and the second control valve 142a. On the other hand, both the first pipeline 141b and the second pipeline 142b are connected to the piston chamber where the piston member 131 is located.

[0029] When the first control valve 141a is opened, the first pipe 141b is opened, allowing fluid to flow into the piston chamber containing the piston 131 for lubrication. Conversely, when the first control valve 141a is closed, the first pipe 141b is closed, preventing fluid from flowing into the piston chamber containing the piston 131. On the other hand, when the second control valve 142a is opened, the second pipe 142b is opened, allowing fluid to flow out of the piston chamber containing the piston 131 for lubrication. Conversely, when the second control valve 142a is closed, the second pipe 142b is closed, preventing fluid from flowing out of the piston chamber containing the piston 131.

[0030] In this embodiment, the control module 200 may include a processor, a storage circuit, and a sensing circuit, with the storage circuit and the sensing circuit electrically coupled to the processor. Specifically, the processor is used to control the overall or partial operation of the compression device 100, and may include, but is not limited to, a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessors, digital signal processors (DSPs), programmable controllers, application-specific integrated circuits (ASICs), programmable logic devices (PLDs), or other similar devices or combinations thereof.

[0031] The storage circuit is used to store data and may include, but is not limited to, volatile storage circuits and non-volatile storage circuits. The volatile storage circuit is used to volatilely store data and may include random access memory (RAM) or similar volatile storage media. The non-volatile storage circuit is used to non-volatilely store data and may include read-only memory (ROM), solid-state disk (SSD), and / or hard disk drive (HDD) or similar non-volatile storage media. Additionally, the sensing circuit is used to detect the overall or partial operating status of the compression device 100, and the processor can store the overall or partial operating status of the compression device 100 detected by the sensing circuit in the storage circuit.

[0032] Figure 2 This is a flowchart illustrating a method for controlling the volume ratio of a compression device according to an embodiment of this utility model. Please refer to it. Figure 1 and Figure 2 The method for controlling the volume ratio of the compression device 100 is described below. In steps S10 to S30, when the compression device 100 is started, the control module 200 receives a start command and sets the adjustment flag to a preset flag value. On the other hand, the control module 200 detects the operating status of the compression device 100 at the moment of startup or after a few seconds and records it as a previous evaluation indicator. For example, the previous evaluation indicator may include current, power, or performance characteristics.

[0033] Next, in steps S40 and S50, after recording the previous evaluation index, at a preset time interval (e.g., any value between 10 and 60 seconds), the control module 200 detects the current operating state of the compression device 100 and records it as the current evaluation index. For example, the current evaluation index may include current, power, or performance. It should be noted that the previous evaluation index and the current evaluation index are the evaluation indices corresponding to the operating states of the compression device 100 in the preceding and following time sequences.

[0034] Next, in step S60, the control module 200 compares the previous evaluation index with the current evaluation index and determines whether the current evaluation index meets preset conditions compared to the previous evaluation index. For example, the preset conditions are that the current evaluation index is better than or equal to the previous evaluation index, or that the current evaluation index is not worse than the previous evaluation index. On the other hand, the current evaluation index being better than or equal to the previous evaluation index may include the current operating current being lower than or equal to the previous operating current, the current power consumption being lower than or equal to the previous power consumption, or the current performance being better than or equal to the previous performance.

[0035] In steps S60 to S80, if the current evaluation indicator meets the preset conditions after being judged compared to the previous evaluation indicator, the adjustment flag is maintained at the preset flag value. Conversely, if the current evaluation indicator does not meet the preset conditions after being judged compared to the previous evaluation indicator, the adjustment flag is set to the reverse flag value. Then, regardless of whether the adjustment flag setting has been switched, it is always judged whether the adjustment flag is the preset flag value.

[0036] If the adjustment flag remains at the preset flag value, step S71 is executed, adjusting in the same direction as the preset flag value. Conversely, if the adjustment flag is not at the preset flag value, step S81 is executed, adjusting in the opposite direction to the preset flag value. In one example, adjusting in the same direction as the preset flag value can be achieved by controlling the drive group 140 to drive the volume adjustment group 130 to increase the volume ratio, i.e., moving towards the exhaust end 112. Conversely, adjusting in the opposite direction to the preset flag value can be achieved by controlling the drive group 140 to drive the volume adjustment group 130 to decrease the volume ratio, i.e., moving towards the intake end 111. In another example, adjusting in the same direction as the preset flag value can be achieved by controlling the drive group 140 to drive the volume adjustment group 130 to decrease the volume ratio, i.e., moving towards the intake end 111. Conversely, adjusting in the opposite direction to the preset flag value can be achieved by controlling the drive group 140 to drive the volume adjustment group 130 to increase the volume ratio, i.e., moving towards the exhaust end 112.

[0037] In one example, within the judgment and control loop for adjusting the volume ratio, switching the adjustment flag to a reverse flag value can be set as follows: During a loop continuously increasing the volume ratio, if the current evaluation indicator, after judgment, does not meet the preset conditions compared to the previous evaluation indicator, the operation of increasing the volume ratio is stopped, and instead, the operation of decreasing the volume ratio is performed. In this case, the adjustment flag is switched, for example, to a reverse flag value instead of the preset flag value. Conversely, during a loop continuously decreasing the volume ratio, if the current evaluation indicator, after judgment, does not meet the preset conditions compared to the previous evaluation indicator, the operation of decreasing the volume ratio is stopped, and instead, the operation of increasing the volume ratio is performed. In this case, the adjustment flag is switched, for example, back to the preset flag value.

[0038] In another example, in the judgment and control loop for adjusting the volume ratio, switching the adjustment flag to a reverse flag value can be set as follows: During a loop continuously decreasing the volume ratio, if the current evaluation indicator, after judgment, does not meet the preset conditions compared to the previous evaluation indicator, the volume ratio reduction operation is stopped, and the volume ratio increase operation is performed instead. In this case, the adjustment flag is switched, for example, to a reverse flag value instead of the preset flag value. Conversely, during a loop continuously increasing the volume ratio, if the current evaluation indicator, after judgment, does not meet the preset conditions compared to the previous evaluation indicator, the volume ratio increase operation is stopped, and the volume ratio decrease operation is performed instead. In this case, the adjustment flag is switched, for example, back to the preset flag value.

[0039] In other words, the control module 200 can determine the direction of the increase or decrease of the switching volume ratio based on the flag value. If increasing the volume ratio is a same-direction operation, then decreasing the volume ratio is a opposite-direction operation. Conversely, if decreasing the volume ratio is a same-direction operation, then increasing the volume ratio is a opposite-direction operation.

[0040] In one example, the preset flag value can be set to 1. In the cycle of continuously increasing the volume ratio, the flag is adjusted to remain unchanged. If the judgment result of the current evaluation index does not meet the preset conditions, the adjustment flag is switched. For example, the adjustment flag is set to 0. This step is regarded as setting the adjustment flag to the reverse flag value.

[0041] Following the above, after setting the adjustment flag to 0, the volume ratio reduction operation is implemented. If the judgment result of the current evaluation indicator and the previous evaluation indicator meets the preset conditions, the adjustment flag remains unchanged, and the volume ratio reduction operation continues. Conversely, if the judgment result of the current evaluation indicator and the previous evaluation indicator does not meet the preset conditions, the adjustment flag is switched, for example, by setting the adjustment flag to 1 (i.e., reverting to the preset flag value). This step is considered as setting the adjustment flag to the reverse flag value.

[0042] In another example, the preset flag value can be set to 1. During the cycle of continuously reducing the volume ratio, the adjustment flag remains unchanged. If the judgment result of the current evaluation index does not meet the preset conditions, the adjustment flag is switched. For example, the adjustment flag is set to 0. This step is regarded as setting the adjustment flag to the reverse flag value.

[0043] Following the above, after setting the adjustment flag to 0, the operation of increasing the floor area ratio is performed. If the judgment result of the current evaluation indicator and the previous evaluation indicator meets the preset conditions, the adjustment flag remains unchanged, and the operation of increasing the floor area ratio continues. Conversely, if the judgment result of the current evaluation indicator and the previous evaluation indicator does not meet the preset conditions, the adjustment flag is switched, for example, the adjustment flag is set to 1 (i.e., reverting to the preset flag value). This step is considered as setting the adjustment flag to the reverse flag value.

[0044] In other words, if the current adjustment flag is set to 1, then in the step of setting the adjustment flag to the reverse flag value, the adjustment flag is set to 0. Conversely, if the current adjustment flag is set to 0, then in the step of setting the adjustment flag to the reverse flag value, the adjustment flag is set to 1. It is worth mentioning that in practical applications, depending on the operating conditions of different compression devices, the operation of increasing or decreasing the volume ratio is set to the preset flag value of 1. Therefore, for compression devices with different setting requirements, the direction of the adjustment flag may differ when the preset flag value is 1.

[0045] Then, in step S90, the previous evaluation index is updated, and the judgment and adjustment steps are repeatedly executed, including steps S40, S50, S60, S70, S80, S71, and S81. Specifically, the previous evaluation index is updated by the control module 200 replacing the previous evaluation index with the current evaluation index, which serves as the comparison benchmark for the next judgment and adjustment step. Furthermore, once the compression device 100 stops, the control module 200 receives a shutdown command and ceases detection, recording, judgment, adjustment, and control actions.

[0046] The volume ratio control method of the aforementioned compression device 100 can continuously determine the direction of increase or decrease in the volume ratio during the operation of the compression device 100 by comparing evaluation indicators (such as operating current, power consumption, or performance) before and after the operation, and control the increase or decrease of the volume ratio so that the volume ratio after real-time adjustment is the optimal value that conforms to or is close to the real-time operating conditions. In addition, in the control process of this utility model, the current real operating conditions can be reflected in real time, and the control module can control the volume adjustment group to quickly approach the optimal value of the real-time operating conditions, so that the performance of the compression device can conform to the current optimal operating conditions. At the same time, it can reduce the number of detection devices and the number of signals processed by the control module, thereby simplifying the control logic and improving the control sensitivity, significantly improving the excessive energy consumption of the compression device 100, and significantly improving the performance of the compression device 100.

[0047] Figure 3 This is a cross-sectional schematic diagram of a compression device according to another embodiment of the present invention. Please refer to it. Figure 3 The compression device 100A of this embodiment can also implement the volume ratio control method of the compression device 100 of the previous embodiment. The compression device 100A of this embodiment is basically the same as the compression device 100 of the previous embodiment, with the main difference being the design of the drive group and the volume adjustment group.

[0048] In detail, in this embodiment, the volume adjustment group 130a may include a screw 131a and a slider 132a coupled to the screw 131a. The rotation of the screw 131a can drive the slider 132a to slide towards the intake end 111 or the exhaust end 112, so as to change the position of the radial exhaust port of the slider 132, thereby achieving the purpose of adjusting the volume ratio.

[0049] On the other hand, the drive assembly includes a motor 140a, which can be a servo motor or a stepper motor, and a screw 131a is coupled to the output shaft of the motor 140a to rotate synchronously and in the same direction as the output shaft of the motor 140a. When the control module 200 controls the motor 140a to drive the screw 131a to rotate around the first rotation direction R1, the screw 131a drives the slider 132a to slide towards the intake end 111, thereby shortening the distance between the radial exhaust port of the slider 132a and the intake end 111, and shortening the stroke of the screw compression assembly 120 to compress the fluid, thereby reducing the exhaust pressure and volume ratio. Conversely, when the control module 200 controls the motor 140a to drive the screw 131a to rotate around the second rotation direction R2, which is opposite to the first rotation direction R1, the screw 131a drives the slider 132a to slide towards the exhaust end 112, thereby increasing the distance between the radial exhaust port of the slider 132 and the intake end 111, and increasing the stroke of the screw compression assembly 120 to compress the fluid, thus increasing the exhaust pressure and volume ratio.

[0050] Figure 4This is a flowchart illustrating a method for controlling the volume ratio of a compression device according to another embodiment of the present invention. Please refer to... Figure 4 The volume ratio control method of this embodiment can be implemented in Figure 1 The compression device 100 shown or Figure 3 The compression device shown in this embodiment is similar to the volume ratio control method of the previous embodiment, with the main difference being the accumulation and judgment of the number of adjustments in the same direction (i.e., the number of times the volume ratio is continuously increased or decreased).

[0051] In this embodiment, when the flag is preset to a preset flag value, if the judgment result of the evaluation index in the preceding and following time sequences in each cycle (i.e., the judgment result of the current evaluation index and the previous evaluation index) meets the preset conditions, the number of adjustments in the same direction is updated, that is, the number of adjustments is increased by one, and the current flag value is maintained to perform the operation of adjusting in the same direction as the preset flag, such as steps S60, S61, S62, S70 and S71.

[0052] Furthermore, in step S61, although the evaluation results of the preceding and following time sequences in each cycle meet the preset conditions, it is necessary to determine whether the cumulative number of same-direction adjustments is less than the preset number. If the cumulative number of same-direction adjustments is less than the preset number, the number of same-direction adjustments is updated (as in step S62), and the current flag value is maintained to perform the same-direction adjustment operation (as in steps S70 and S71).

[0053] Conversely, as in steps S61 and S80, if the cumulative number of same-direction adjustments is equal to or greater than the preset number, the adjustment flag is forcibly set to the reverse flag value, and the number of same-direction adjustments is reset to zero. On the other hand, as in steps S60 and S80, if the judgment result of the evaluation index of the preceding and following time sequences in a certain cycle does not meet the preset conditions, the adjustment flag is forcibly set to the reverse flag value, and the number of same-direction adjustments is reset to zero. In practical applications, the preset number can be set to any value between 5 and 30 times, depending on the model and specifications of different compression devices, but is not limited to this.

[0054] As in steps S80, S70, and S81, after adjusting the flag to the reverse flag value, an operation is performed that is reversed from the preset flag. Next, as in steps S90, S40, S50, and S60, the evaluation indicators for the preceding and following time sequences in the next cycle are determined. If the evaluation results for the preceding and following time sequences in each cycle meet the preset conditions, the number of unidirectional adjustments is updated (i.e., the number is incremented by one), and the current flag value is maintained for unidirectional adjustments. For example, the operation of adjusting in the opposite direction to the preset flag is continuously performed, as in steps S60, S61, S62, S70, and S81.

[0055] Furthermore, in step S61, although the evaluation results of the preceding and following time sequences in each cycle meet the preset conditions, it is necessary to determine whether the cumulative number of same-direction adjustments is less than the preset number. If the cumulative number of same-direction adjustments is less than the preset number, the number of same-direction adjustments is updated (as in step S62), and the current flag value is maintained to perform same-direction adjustment operations (as in steps S70 and S81).

[0056] Conversely, as in steps S61 and S80, if the cumulative number of same-direction adjustments is equal to or greater than the preset number, the adjustment flag is forcibly set to the reverse flag value (i.e., reverted to the preset flag value), and the number of same-direction adjustments is reset to zero. On the other hand, as in steps S60 and S80, if the judgment result of the evaluation index in the preceding and following time sequences in a certain cycle (i.e., the judgment result of the current evaluation index and the previous evaluation index) does not meet the preset conditions, the adjustment flag is forcibly set to the reverse flag value (i.e., reverted to the preset flag value), and the number of same-direction adjustments is reset to zero. As in steps S80, S70, and S71, after the adjustment flag reverts to the preset flag value, the operation of adjusting in the same direction as the preset flag is performed.

[0057] Through the above-mentioned judgment and control cycle of adjusting the volume ratio, the optimal range of the volume ratio can be continuously reduced and approached the optimal volume ratio under real-time operating conditions. It can also prevent the volume ratio from increasing or decreasing indefinitely and reaching the limit setting of the hardware.

[0058] On the other hand, as in steps S10 and S21, if the compression device 100 restarts after being stopped, the control module 200 will first perform an initialization operation, such as setting the adjustment flag to a preset flag value and resetting the number of adjustments in the same direction to zero.

[0059] The compression device and control method proposed in this invention are applicable not only to volume ratio control of fixed-frequency compression devices but also to variable-frequency compression devices. Furthermore, when the frequency of a variable-frequency compression device changes for a period of time, the frequency tends to stabilize. At this point, the control method of this invention can also perform volume ratio control when the frequency of the variable-frequency compression device is stable. Regardless of how the frequency of the variable-frequency compression device changes, the control process of this invention can reflect the current actual operating conditions in real time. The control module can control the volume adjustment group to quickly approach the optimal value of the real-time operating conditions, ensuring that the performance of the compression device meets the current optimal operating conditions.

[0060] In summary, the compression device and its volume ratio control method proposed in this invention can continuously determine the direction of increase or decrease in the volume ratio during the operation of the compression device by comparing evaluation indicators (such as operating current, power consumption, or performance) before and after the device's operation, and control the increase or decrease of the volume ratio so that the volume ratio after real-time adjustment is the optimal value that conforms to or is close to the real-time operating conditions. Furthermore, in the control process of this invention, the current actual operating conditions can be reflected in real time. The control module can control the volume adjustment group to quickly approach the optimal value of the real-time operating conditions, so that the performance of the compression device conforms to the current optimal operating conditions. At the same time, it can reduce the number of detection devices and the number of signals processed by the control module, thereby simplifying the control logic and improving control sensitivity, significantly improving the excessive energy consumption of the compression device, and greatly enhancing the performance of the compression device.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 therein. Such 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 this utility model.

Claims

1. A compression device, characterized in that, Comprising a body having a suction end and a discharge end opposite to the suction end; a screw compression unit disposed in the body; a volume adjustment unit disposed in the body corresponding to the screw compression unit; a driving unit coupled to the volume adjustment unit to drive the volume adjustment unit to adjust a volume ratio; and a control module implemented by an electronic circuit including a processor, a storage circuit, and a sensing circuit, wherein the processor is electrically connected to the driving unit, and the storage circuit and the sensing circuit are electrically coupled to the processor, the sensing circuit is used to detect the operating state of the front and rear time sequence, and record as the corresponding evaluation index in the storage circuit, and the processor controls the driving unit to drive the volume adjustment unit to adjust the volume ratio based on the comparison result of the evaluation index of the front and rear time sequence. The volume adjustment unit includes a piston coupled to the driving unit and a slider connected to the piston, and the slider is disposed on one side of the screw compression unit, and the piston is used to drive the slider to slide to the suction end or to slide to the discharge end.

2. The compression device of claim 1, wherein, The driving unit includes a first oil path and a second oil path coupled to the piston, when the processor opens the first oil path and closes the second oil path, the piston slides to the suction end, and when the processor opens the second oil path and closes the first oil path, the piston slides to the discharge end.

3. The compression device of claim 2, wherein, The volume adjustment unit includes a screw coupled to the driving unit and a slider coupled to the screw, and the slider is disposed on one side of the screw compression unit, and the screw is used to drive the slider to slide to the suction end or to slide to the discharge end.

4. The compression device of claim 1, wherein, The driving unit includes a motor, and the screw is coupled to the motor, when the processor controls the motor to drive the screw to rotate in a first rotation direction, the screw drives the slider to slide to the suction end, and when the processor controls the motor to drive the screw to rotate in a second rotation direction opposite to the first rotation direction, the screw drives the slider to slide to the discharge end.

5. The compression device of claim 4, wherein, ​

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