Method and device for controlling compressor and water chilling unit

Abstract

The invention relates to the technical field of water chilling units, and discloses a compressor control method, a compressor comprises an oil cylinder and a slide valve arranged on the oil cylinder, and the position of the slide valve is used for indicating the oil quantity of the oil cylinder; the method comprises the steps of obtaining the current position of the slide valve; determining the current operation load of the compressor according to the current position of the slide valve; and adjusting the running state of the compressor according to the current running load of the compressor. According to the method, the current operation load of the compressor is accurately determined by monitoring the current position of the sliding valve in real time, the operation state of the compressor is adjusted according to the current operation load of the compressor, load fluctuation is reduced, the current operation load approaches the target operation load, accurate control over load adjustment is improved, and the service life of the compressor is prolonged. Therefore, the operation stability of the compressor is improved. The invention further discloses a device for controlling the compressor and the water chilling unit.

Description

Technical Field

[0001] The present application relates to the technical field of water chillers, and for example, to a method and device for controlling a compressor and a water chiller. Background Art

[0002] Currently, there is a need to improve the operational stability of compressors (such as screw compressors). While steplessly adjustable screw compressors can be adjusted over a wide range from 25% to 100%, energy efficiency can only be measured at 25% and 100%, leaving other load points unmeasured. This prevents the screw compressor from maintaining the desired stable operating state, resulting in poor operational stability.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0004] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0005] Embodiments of the present disclosure provide a method, apparatus, and chiller for controlling a compressor, so as to improve the accurate control of load regulation and thus improve the stability of compressor operation.

[0006] In some embodiments, the compressor includes an oil cylinder and a sliding valve arranged on the oil cylinder, and the sliding valve is used to indicate the amount of oil in the oil cylinder; the method for controlling the compressor includes: obtaining a current position of the sliding valve; determining a current operating load of the compressor based on the current position of the sliding valve; and adjusting the operating state of the compressor based on the current operating load of the compressor.

[0007] Optionally, the running state includes a loading running state or an unloading running state.

[0008] Optionally, the operating state of the compressor is adjusted according to the current operating load of the compressor, including: when the current operating load of the compressor is greater than the target operating load, adjusting the compressor to an unloaded operating state; and / or, when the current operating load of the compressor is less than the target operating load, adjusting the compressor to a loaded operating state.

[0009] Optionally, the operating state also includes a stable operating state.

[0010] Optionally, adjusting the operating state of the compressor according to the current operating load of the compressor further includes: when the current operating load of the compressor is equal to the target operating load, adjusting the compressor to be in a stable operating state.

[0011] Optionally, the operating state of the compressor is adjusted according to the current operating load of the compressor, including: obtaining the load difference between the current operating load of the compressor and the target operating load; when the load difference is greater than a preset difference, adjusting the compressor to an unloaded operating state; and / or, when the load difference is less than a preset difference, adjusting the compressor to a loaded operating state.

[0012] Optionally, the compressor further includes an oil supply pipeline connected to the oil cylinder, which enables or prohibits the oil from being supplied to the oil cylinder by opening or disconnecting the oil supply pipeline; and an oil discharge pipeline connected to the oil cylinder, which enables or prohibits the oil from being discharged from the oil cylinder by opening or disconnecting the oil discharge pipeline; the operating state includes a loaded operating state or an unloaded operating state.

[0013] Optionally, the operating state of the compressor is adjusted as follows: the oil supply line is disconnected and the oil discharge line is opened to put the compressor in an unloaded operating state; and / or the oil supply line is opened and the oil discharge line is disconnected to put the compressor in a loaded operating state.

[0014] Optionally, the compressor further includes a first solenoid valve, which is arranged in the oil supply pipeline, and the oil supply pipeline is opened or closed by opening or closing the first solenoid valve; and a second solenoid valve, which is arranged in the oil discharge pipeline, and the oil discharge pipeline is opened or closed by opening or closing the second solenoid valve.

[0015] Optionally, disconnecting the oil supply line and connecting the oil drain line includes: adjusting the first solenoid valve to close and the second solenoid valve to open; and / or connecting the oil supply line and disconnecting the oil drain line includes: adjusting the first solenoid valve to open and the second solenoid valve to close.

[0016] Optionally, the compressor further includes a slide valve displacement detection device for detecting the displacement value of the slide valve.

[0017] Optionally, obtaining the current position of the slide valve includes: obtaining a slide valve displacement value detected by a slide valve displacement detection device; and determining the current position of the slide valve according to the slide valve displacement value.

[0018] In some embodiments, the compressor includes an oil cylinder and a sliding valve arranged on the oil cylinder, the sliding valve is used to indicate the amount of oil in the oil cylinder, and the device for controlling the compressor includes: an acquisition module, configured to obtain the current position of the sliding valve; a determination module, configured to determine the current operating load of the compressor based on the current position of the sliding valve; and an adjustment module, configured to adjust the operating state of the compressor based on the current operating load of the compressor.

[0019] In some embodiments, an apparatus for controlling a compressor includes a processor and a memory storing program instructions, and the processor is configured to execute the above-described method for controlling a compressor when executing the program instructions.

[0020] In some embodiments, the chiller includes: a chiller body; a compressor disposed on the chiller body; and a device for controlling the compressor as described above, installed on the chiller body.

[0021] The method, device, and chiller for controlling a compressor provided by the embodiments of the present disclosure can achieve the following technical effects:

[0022] By real-time monitoring of the current position of the slide valve, the current operating load of the compressor can be accurately determined, and the operating state of the compressor can be adjusted according to the current operating load of the compressor to reduce load fluctuations and make the current operating load approach the target operating load, thereby improving the accurate control of load regulation and thus improving the stability of compressor operation.

[0023] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0025] Figure 1 is a schematic diagram of the compressor;

[0026] Figure 2 is a schematic diagram of a method for controlling a compressor provided by an embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of another method for controlling a compressor provided by an embodiment of the present disclosure;

[0028] Figure 4 is a schematic diagram of a device for controlling a compressor provided by an embodiment of the present disclosure;

[0029] Figure 5 is a schematic diagram of another device for controlling a compressor provided by an embodiment of the present disclosure;

[0030] Figure 6 This is a structural block diagram of a chiller product provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0032] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0033] Unless otherwise stated, the term "plurality" means two or more.

[0034] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0035] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0036] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0038] In the embodiment of the present disclosure, the method for controlling a compressor is applied to a compressor 1, such as a screw compressor. Figure 1 As shown, compressor 1 includes an oil cylinder 10 and a slide valve 20 disposed on cylinder 10. The position of slide valve 20 indicates the oil level in the cylinder. The compressor also includes an electronic control device, such as a Programmable Logic Controller (PLC). The electronic control device is used to obtain the current position of slide valve 20, determine the current operating load of compressor 1, and adjust the operating status of compressor 1, thereby achieving various functions of controlling compressor 1.

[0039] Optionally, the compressor 1 further includes an oil supply line 30 and an oil drain line 40. The oil supply line 30 is connected to the oil cylinder, and oil supply to the cylinder or oil supply to the cylinder can be controlled by opening or disconnecting the oil supply line 30. The oil drain line 40 is connected to the oil cylinder, and oil discharge from the cylinder can be controlled by opening or disconnecting the oil drain line 40. In this way, the oil level in the cylinder can be controlled by the oil supply line 30 and the oil drain line 40.

[0040] Optionally, the compressor 1 further includes a first solenoid valve 50 and a second solenoid valve 60. The first solenoid valve 50 is disposed in the oil supply line 30. Opening or closing the first solenoid valve 50 opens or closes the oil supply line 30. The second solenoid valve 60 is disposed in the oil drain line 40. Opening or closing the second solenoid valve 60 opens or closes the oil drain line 40. In this manner, the first solenoid valve 50 and the second solenoid valve 60 can accurately control the opening or closing of the oil supply line 30 and the oil drain line 40.

[0041] Optionally, the compressor 1 further includes an oil storage tank 70 for storing oil. The oil storage tank 70 is connected to the oil cylinder 10 via an oil supply line 30 and an oil discharge line 40. Thus, oil in the oil storage tank 70 can be supplied to the oil cylinder 10 via the oil supply line 30, and oil in the oil cylinder 10 can be discharged to the oil storage tank 70 via the oil discharge line 40.

[0042] Optionally, the compressor 1 further includes a slide valve displacement detection device for detecting and providing a displacement value of the slide valve 20 in real time to determine the current position of the slide valve 20. The slide valve displacement detection device includes a slide valve displacement sensor. Specifically, the slide valve displacement sensor includes a magnetoresistive slide valve displacement sensor, a capacitive slide valve displacement sensor, an inductive slide valve displacement sensor, or the like.

[0043] Combine Figure 1 The compressor shown in the figure, the embodiment of the present disclosure provides a method for controlling the compressor, and the execution subject of the method can be an electronic control device. Figure 2 As shown, the method includes:

[0044] S201 The electronic control device obtains the current position of the slide valve.

[0045] S202: The electronic control device determines the current operating load of the compressor according to the current position of the slide valve.

[0046] S203: The electronic control device adjusts the operating state of the compressor according to the current operating load of the compressor.

[0047] The method for controlling a compressor provided by an embodiment of the present disclosure monitors the current position of the slide valve in real time to accurately determine the current operating load of the compressor, and adjusts the operating state of the compressor according to the current operating load of the compressor to reduce load fluctuations and make the current operating load approach the target operating load, thereby improving the accurate control of load regulation and improving the stability of compressor operation.

[0048] Optionally, the operating state includes a loaded operating state or an unloaded operating state. The loaded operating state indicates that the compressor begins or increases its air compression workload, i.e., the amount of oil in the oil cylinder increases. The unloaded operating state indicates that the compressor stops or significantly reduces its air compression workload, i.e., the amount of oil in the oil cylinder decreases.

[0049] Optionally, the operating state further includes a stable operating state, wherein the stable operating state means that the compressor does not perform a loaded operating state or an unloaded operating state, that is, the oil volume in the oil cylinder remains unchanged at the current capacity.

[0050] Optionally, the electronic control device adjusts the operating state of the compressor based on the current operating load of the compressor, including: when the current operating load of the compressor is greater than a target operating load, the electronic control device adjusts the compressor to an unloaded operating state. And / or when the current operating load of the compressor is less than the target operating load, the electronic control device adjusts the compressor to a loaded operating state.

[0051] Illustratively, the target operating load is a range or target value dynamically set according to actual operating conditions and system requirements.

[0052] In this disclosed embodiment, when the current operating load is greater than the target operating load, when the output generated by the compressor (such as air flow or cooling capacity) exceeds the demand, the pressure will cause it to rise to a preset target pressure value. At this time, the electronic control device will detect this overload condition and respond quickly, switching the compressor to an unloaded operating state. In the unloaded state, the compression efficiency is reduced, so that the compressor rotor operates under low or no load conditions. This is done to avoid excessive system pressure caused by overcompression, while also reducing energy consumption and preventing equipment overheating or damage. When the current operating load is less than the target operating load, when demand increases or the compressor output is insufficient to maintain the set pressure level for some reason, the electronic control device will detect that the current operating load is lower than the target operating load. At this time, it will instruct the screw compressor to enter a loaded operating state, thereby increasing the output to meet the demand for compressed air or refrigerant. In this way, the current operating load of the compressor is ensured to be stable within the preset target range, improving the stability of the compressor operation.

[0053] In addition, the compressor can flexibly adapt to different working conditions, ensuring the stability and reliability of the compressor operation while achieving the goal of energy saving and consumption reduction.

[0054] Optionally, the electronic control device adjusting the operating state of the compressor based on the current operating load of the compressor includes: the electronic control device obtaining a load difference between the current operating load of the compressor and a target operating load. If the load difference is greater than a preset difference, the electronic control device adjusts the compressor to an unloaded operating state. And / or, if the load difference is less than a preset difference, the electronic control device adjusts the compressor to a loaded operating state.

[0055] It can be understood that the load difference = current operating load - target operating load.

[0056] Exemplarily, the preset difference can be set to [0, 0.1]. Specifically, the preset difference is set to 0, 0.05, or 0.1. For example, if the preset difference is set to 0, as long as there is a slight difference between the current operating load and the target operating load (i.e., reaching the threshold of 0), the electronic control device will immediately react and adjust the compressor to a loaded or unloaded state. This can achieve extremely high pressure stability and rapid responsiveness. If the preset difference is set to 0.05, the preset difference is relatively small. The electronic control device will maintain the current operating state when the current operating load differs from the target operating load within 0.05 units, and will perform a loading or unloading operation if it exceeds this range. This provides more sensitive regulation while avoiding overly frequent switching operations, balancing the relationship between pressure control accuracy and equipment life and energy consumption. If the preset difference is set to 0.1, the state transition will only be executed when the current operating load differs from the target operating load by more than 0.1 units. This makes the frequency of the compressor switching operating states relatively low, helping to extend the service life of the equipment. It is understood that the specific setting value of the preset difference is set according to actual needs.

[0057] For example, the Proportional-Integral-Derivative (PID) algorithm is used to calculate the load difference between the current operating load and the target operating load. This allows for more efficient adjustment of the compressor's operating state. Accurate calculations allow for timely loading and unloading adjustments, maintaining the compressor in a stable operating state and achieving efficient, smooth, and energy-saving operation. PID can be either incremental or positional.

[0058] Optionally, the electronic control device adjusts the operating state of the compressor as follows: the electronic control device disconnects the oil supply line and connects the oil drain line to place the compressor in an unloaded operating state. And / or the electronic control device connects the oil supply line and disconnects the oil drain line to place the compressor in a loaded operating state.

[0059] It can be understood that by disconnecting the oil supply line and opening the oil drain line, the oil in the cylinder is discharged through the oil drain line, and the compressor is put into an unloaded operating state, thereby reducing the operating load of the compressor. By opening the oil supply line and disconnecting the oil drain line, the oil in the cylinder is supplied through the oil supply line, and the compressor is put into a loaded operating state, thereby increasing the operating load of the compressor.

[0060] In this disclosed embodiment, the operating state of the compressor is adjusted by adjusting the conduction or closing of the oil supply pipeline and the oil discharge pipeline, so that the operating load of the compressor approaches the target operating load, thereby improving the stability of the compressor operation.

[0061] Optionally, the electronic control device disconnects the oil supply line and opens the oil drain line, including: adjusting the first solenoid valve to close and the second solenoid valve to open.

[0062] Optionally, the electronic control device connects the oil supply line and disconnects the oil discharge line, including: regulating the first solenoid valve to open and the second solenoid valve to close.

[0063] In this way, the oil supply pipeline and the oil discharge pipeline can be opened or closed by adjusting the first solenoid valve and the second solenoid valve.

[0064] Optionally, the electronic control device obtaining the current position of the slide valve includes: the electronic control device obtaining a slide valve displacement value detected by a slide valve displacement detection device, and the electronic control device determining the current position of the slide valve according to the slide valve displacement value.

[0065] For example, the initial position of the slide valve is A, and the slide valve displacement value detected by the slide valve displacement detection device is B, then the current position of the slide valve is A+B.

[0066] In the disclosed embodiment, the current position of the slide valve is accurately fed back by the slide valve displacement detection device, so that the working volume of the compressor can be adjusted more accurately, thereby achieving precise control of the operating load of the compressor.

[0067] Optionally, the electronic control device adjusting the operating state of the compressor according to the current operating load of the compressor further includes: the electronic control device adjusting the compressor to a stable operating state when the current operating load of the compressor is equal to the target operating load.

[0068] like Figure 3 As shown, an embodiment of the present disclosure provides another method for controlling a compressor, comprising:

[0069] S301: The electronic control device obtains the current position of the slide valve.

[0070] S302, the electronic control device determines the current operating load of the compressor according to the current position of the slide valve;

[0071] S303: When the current operating load of the compressor is greater than the target operating load, the electronic control device adjusts the compressor to an unloading operating state.

[0072] S304: When the current operating load of the compressor is less than the target operating load, the electronic control device adjusts the compressor to a loaded operating state.

[0073] S305 , when the current operating load of the compressor is equal to the target operating load, the electronic control device adjusts the compressor to a stable operating state.

[0074] In the disclosed embodiment, since the current operating load is equal to the target operating load, the compressor does not need to perform loading or unloading operations, thereby reducing unnecessary energy consumption and improving the overall energy efficiency of the application equipment.

[0075] Optionally, the electronic control device regulating the compressor to be in a stable operating state includes: the electronic control device disconnecting the oil supply pipeline and the oil discharge pipeline.

[0076] Optionally, the electronic control device disconnecting the oil supply line and the oil discharge line includes: the electronic control device adjusting the first solenoid valve to close and the second solenoid valve to close. In this way, the oil amount in the oil cylinder can be controlled to remain constant, so that the compressor is in a stable operating state.

[0077] Combine Figure 4 As shown, an embodiment of the present disclosure provides an apparatus 200 for controlling a compressor, comprising an acquisition module 21, a determination module 22, and an adjustment module 23. The acquisition module 21 is configured to obtain a current position of a slide valve; the determination module 22 is configured to determine a current operating load of the compressor based on the current position of the slide valve; and the adjustment module 23 is configured to adjust the operating state of the compressor based on the current operating load of the compressor.

[0078] The device 200 for controlling a compressor provided by the embodiment of the present disclosure is advantageous in improving the stability of the compressor operation.

[0079] Combine Figure 5 As shown, an embodiment of the present disclosure provides a device 300 for controlling a compressor, comprising a processor 500 and a memory 501. Optionally, the device 300 may further comprise a communication interface 502 and a bus 503. The processor 500, the communication interface 502, and the memory 501 may communicate with each other via the bus 503. The communication interface 502 may be used for information transmission. The processor 500 may call the logic instructions in the memory 501 to execute the method for controlling a compressor of the above embodiment.

[0080] In addition, the logic instructions in the memory 501 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0081] Memory 501, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present disclosure. Processor 500 executes the program instructions / modules stored in memory 501 to perform functional applications and data processing, thereby implementing the compressor control method in the above-described embodiments.

[0082] The memory 501 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 501 may include a high-speed random access memory and a non-volatile memory.

[0083] Combine Figure 6 As shown, an embodiment of the present disclosure provides a chiller 100, comprising: a chiller body 1001, a compressor, and the above-mentioned device 200 (300) for controlling the compressor. The device 200 (300) for controlling the compressor is installed on the chiller body 1001. The installation relationship described here is not limited to being placed inside the chiller body 1001, but also includes installation connections with other components of the chiller 100, including but not limited to physical connections, electrical connections or signal transmission connections. It can be understood by those skilled in the art that the device 200 (300) for controlling the compressor can be adapted to a feasible chiller body, thereby realizing other feasible embodiments. Among them, the compressor is arranged on the chiller body 1001.

[0084] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned method for controlling a compressor.

[0085] The technical solutions of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, among other media capable of storing program code.

[0086] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

[0087] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0088] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, and can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0089] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a compressor, characterized in that The compressor includes an oil cylinder and a slide valve disposed on the oil cylinder, wherein the position of the slide valve is used to indicate the oil level in the oil cylinder; the method includes: Get the current position of the spool valve; determining the current operating load of the compressor based on the current position of the slide valve; The operating state of the compressor is adjusted according to the current operating load of the compressor.

2. The method according to claim 1, characterized in that The operating state includes a loaded operating state or an unloaded operating state. The operating state of the compressor is adjusted according to the current operating load of the compressor, including: When the current operating load of the compressor is greater than the target operating load, adjusting the compressor to an unloaded operating state; and / or, When the current operating load of the compressor is less than the target operating load, the compressor is adjusted to be in a loaded operating state.

3. The method according to claim 2, characterized in that The operating state also includes a stable operating state; Adjusting the operating state of the compressor according to the current operating load of the compressor also includes: When the current operating load of the compressor is equal to the target operating load, the compressor is adjusted to be in a stable operating state.

4. The method according to claim 1, wherein The operating state includes a loaded operating state or an unloaded operating state. The operating state of the compressor is adjusted according to the current operating load of the compressor, including: Obtaining a load difference between a current operating load of the compressor and a target operating load; When the load difference is greater than a preset difference, adjusting the compressor to an unloaded operating state; and / or, When the load difference is less than the preset difference, the compressor is adjusted to be in a loaded operation state.

5. The method according to claim 1, wherein The compressor further includes an oil supply line connected to the oil cylinder, and the oil supply line is opened or disconnected to allow oil to be supplied to the oil cylinder or to prevent oil from being supplied to the oil cylinder; and an oil discharge line connected to the oil cylinder, and the oil discharge line is opened or disconnected to allow oil in the oil cylinder to be discharged or to prevent oil from being discharged from the oil cylinder; the operating state includes a loaded operating state and an unloaded operating state; and the operating state of the compressor is adjusted in the following manner: Disconnect the oil supply line and open the oil drain line to put the compressor into unloaded operation; and / or, Open the oil supply line and disconnect the oil drain line to put the compressor into loaded operation state.

6. The method according to claim 5, characterized in that The compressor further includes a first solenoid valve, which is arranged in the oil supply pipeline, and the oil supply pipeline is opened or closed by opening or closing the first solenoid valve; and a second solenoid valve, which is arranged in the oil discharge pipeline, and the oil discharge pipeline is opened or closed by opening or closing the second solenoid valve; wherein, Disconnect the oil supply line and open the oil drain line, including: Adjust the first solenoid valve to close and the second solenoid valve to open; and / or, Open the oil supply line and disconnect the oil drain line, including: The first solenoid valve is regulated to open and the second solenoid valve is regulated to close.

7. The method according to claim 1, characterized in that The compressor also includes a slide valve displacement detection device for detecting the displacement value of the slide valve; obtaining the current position of the slide valve includes: obtaining a slide valve displacement value detected by a slide valve displacement detection device; The current position of the spool valve is determined based on the spool valve displacement value.

8. A device for controlling a compressor, characterized in that: The compressor includes an oil cylinder and a slide valve provided on the oil cylinder. The position of the slide valve is used to indicate the oil level in the oil cylinder. The device includes: an acquisition module configured to obtain a current position of the slide valve; a determination module configured to determine a current operating load of the compressor according to a current position of the slide valve; The adjustment module is configured to adjust the operating state of the compressor according to the current operating load of the compressor.

9. A device for controlling a compressor, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for controlling a compressor according to any one of claims 1 to 7 when running the program instructions.

10. A chiller, characterized in that: include: Chiller body; The compressor is installed in the chiller body; The device for controlling a compressor according to claim 8 or 9 is installed on the chiller body.

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