A drain control system for a multi-shaft compressor

Abstract

The application relates to a drainage control system of a multi-shaft compressor and relates to the technical field of condensate water treatment; the system comprises water storage tanks, the water storage tanks are arranged in one-to-one correspondence with preset drainage positions, the water storage tanks are used for receiving condensate water generated by the corresponding drainage positions, each water storage tank is correspondingly provided with a drainage valve and a liquid level detector, the liquid level detector and the drainage valve are jointly electrically connected with a controller, the controller is used for controlling the liquid level detector to detect water level data in the corresponding water storage tank and controlling opening and closing of the corresponding drainage valve based on the water level data; the application has the effect of efficiently collecting and discharging condensate water in the working process of the compressor.

Description

Technical Field

[0001] This application relates to the field of condensate treatment technology, and in particular to a drainage control system for a multi-shaft compressor. Background Technology

[0002] A multi-shaft compressor is a device used to compress steam. It can be understood as a driven fluid machine that elevates low-pressure steam into high-pressure gas. In practice, it draws in low-temperature, low-pressure steam through an intake pipe, then a motor drives a gearbox, ultimately compressing the steam into high-temperature, high-pressure steam by an impeller, providing power for steam recirculation. For example, in a heat pump distillation system, the multi-shaft compressor first extracts less volatile steam (called secondary steam) from the top of the column. This steam is typically rich in heat from low-boiling-point components. The extracted secondary steam is then fed into the multi-shaft compressor for compression. During this process, the steam pressure and temperature increase. This method of increasing the internal energy of the steam through compression effectively recovers the low-temperature heat energy that would otherwise be wasted. The high-temperature, high-pressure steam, after compression and heating, is reinjected into the heating section of the distillation column as a heat source to replace or supplement external energy, used to heat the material entering the column and promote the separation of different components. Thus, the portion that would otherwise require external heat is now supplied by the heat energy generated internally by the system, significantly improving the energy efficiency of the entire distillation process. Through this design, heat pump distillation forms a closed-loop thermal energy cycle system, which not only reduces the demand for external energy but also lowers operating costs and environmental emissions, demonstrating high efficiency and sustainability. Due to sufficient heat exchange, the large amount of water vapor present in the entire closed-loop system condenses into small water droplets. These condensed water droplets are called condensate and flow out through the drainage pipe.

[0003] To prevent condensate droplets from hitting the impeller and causing unit vibration, overcurrent, impeller erosion, and other phenomena, it is generally necessary to drain the condensate. However, for multi-shaft compressors, there are multiple locations where condensate is likely to be generated. Relying on manual drainage is inconvenient, and high-temperature steam with high flow rates is usually present around the compressor equipment. Manual drainage can easily lead to personal safety hazards, so it needs to be improved. Summary of the Invention

[0004] In order to achieve efficient collection and discharge of condensate during the operation of the compressor, this application provides a drainage control system for a multi-shaft compressor.

[0005] This application provides a drainage control system for a multi-shaft compressor, including a water tank. Each water tank is configured to correspond one-to-one with a preset drainage position. The water tank is used to collect condensate generated at the corresponding drainage position. Each water tank is equipped with a drain valve and a level detector. The level detector and the drain valve are electrically connected to a controller. The controller is used to control the level detector to detect the water level data in the corresponding water tank and to control the opening and closing of the corresponding drain valve based on the water level data.

[0006] By adopting the above technical solution, a water tank for collecting condensate is placed in advance at each location where condensate is easily generated. The water level in the water tank is detected by a level detector, and the controller determines whether to open the drain valve for drainage based on the water level data. If so, the drain valve is opened to drain the water. This replaces manual drainage, realizes automated and intelligent drainage, and avoids the safety hazards caused by manual drainage.

[0007] Preferably, the controller includes a main control module and a prediction module, wherein the liquid level detector and the drain valve are both electrically connected to the main control module, and the prediction module is communicatively connected to the main control module; The prediction module is used to predict the probability of condensation at each drainage location at the current moment based on a preset influencing factor. The main control module is used to control the liquid level detector at the corresponding drainage location to detect water level data when the probability predicted by the prediction module is greater than the preset probability value. The influencing factor includes at least the temperature and humidity of the surrounding environment of the drainage location.

[0008] By adopting the above technical solution, the probability of condensation at each drainage location is determined by the prediction module. When condensation occurs, the liquid level detector at the corresponding drainage location is controlled to detect the water level data only when the detected probability is greater than the preset probability value. This is used as the detection trigger condition for the liquid level detector. Furthermore, this application limits temperature and humidity as influencing factors for predicting whether condensation will occur, so as to improve the accuracy and comprehensiveness of the prediction.

[0009] Preferably, all the water tanks are connected to a main pipe via straight pipes, and the main pipe is connected to a collection tank. Each water tank has a corresponding drain valve to control whether the corresponding water tank is connected to the main pipe. The controller also includes a drain module, which determines the opening and closing time of the corresponding drain valve when there are several drainage points that need to be opened for drainage. The drain module is communicatively connected to the main control module, which controls the opening and closing of the corresponding drain valve based on the opening and closing time determined by the drain module.

[0010] By adopting the above technical solution, this application utilizes the pipeline formed by branch pipes and main pipes to ensure that the condensate in all water storage tanks is ultimately discharged into the collection tank. Furthermore, considering the pipeline structure, all branch pipes are connected to the main pipe, meaning that the condensate in all water storage tanks will share a single pipeline (i.e., the main pipe) during its flow into the collection tank. This reduces the complexity and difficulty of pipeline layout and saves costs. On the other hand, this application achieves independent control of all drainage locations by controlling the opening and closing time of the drain valves. This solution allows for sequential drainage of all drainage locations in a "queueing" manner. When multiple drainage locations require drainage simultaneously, it reduces the possibility of condensate merging and converging in the main pipe, thus reducing the impact on drainage flow rate.

[0011] Preferably, the drainage module is used to acquire the water level data detected by the liquid level detector and determine whether there is a target location, wherein the target location refers to the drainage location corresponding to the water level data being higher than a preset water level threshold. The drainage module is also used to determine the confluence point corresponding to each target location when a target location exists. The confluence point refers to the process of condensate in the target location being discharged into the water collection tank, and the location where the branch pipe and the main pipe intersect and connect, through which condensate in other target locations flows. The drainage module is also used to determine the drainage time and drainage valve opening of each target location, and to calculate the drainage volume required to be discharged at each target location during the flow period when it flows through the corresponding confluence point, so that the flow periods corresponding to all target locations flowing through the same confluence point do not overlap. The main control module is used to control the corresponding target positions to open and drain water according to the order of drainage time of all target positions determined by the drainage module.

[0012] By adopting the above technical solution, when there are several target drainage locations that need to be drained, the drainage time of each drainage location and the opening degree of the corresponding drainage valve (i.e., the flow rate of the drainage water) are adjusted to adjust the flow period of the water at the corresponding target drainage location when it flows through the confluence point. This ensures that the flow periods of all target locations flowing through the same confluence point do not overlap, thereby ensuring that there is no merging when all target drainage locations are draining, and achieving the effect of individual and non-simultaneous drainage of all target drainage locations.

[0013] Preferably, during the process of determining the drainage time and drain valve opening at each target location, the drainage module is used to: Calculate the time period during which the water flows through the corresponding confluence point at each target location at the current time, while controlling the corresponding drain valve to open to a preset degree and discharging a predetermined amount of water; If there is no overlap between the flow time periods corresponding to all target locations that flow through the same confluence point in all the currently calculated flow time periods, then the current time will be used as the drainage time for all target locations, and the preset opening degree will be used as the drainage valve opening degree corresponding to all target locations. If there is an intersection, then based on the selection factor of each target location at the current time, the selection factor includes at least the latest drainage time of the corresponding target location, the minimum opening degree of the corresponding target location, and the maximum opening degree; calculate and generate a set of alternative time periods for each target location based on the selection factor, wherein the set of alternative time periods includes several alternative time periods, and at least one of the alternative time periods is the time period when the drain valve of the corresponding target location discharges a certain amount of condensate at the maximum opening degree at the corresponding latest drainage time and flows through the corresponding confluence point; From the set of alternative time periods corresponding to each target location, select alternative time periods as the flow time periods for the corresponding target location, so that there is no overlap between the flow time periods corresponding to all target locations flowing through the same confluence point; then, based on the selection factor corresponding to the selected alternative time periods, determine the drainage time and drainage valve opening of the corresponding target location.

[0014] By adopting the above technical solution, when determining the opening degree and drainage time of the drain valve, different selection factors (i.e., maximum opening degree, minimum opening degree, and latest drainage time) are combined to generate selection conditions. The determined flow period corresponding to each selection condition is calculated. The selection conditions can be: the drain valve discharges a fixed amount of condensate at the current time with the minimum opening degree, or the drain valve discharges a fixed amount of condensate from the latest drainage time with the maximum opening degree. The flow period corresponding to all selection conditions at the confluence point is taken as the candidate period. Finally, the candidate period that can be used as the flow period is selected from the set of candidate period periods for all target locations.

[0015] Preferably, when the drainage module selects a candidate time period for the corresponding target location from the set of candidate time periods corresponding to each target location, the drainage module is used to: determine the priority of each target location based on the number of confluence points through which the condensate discharged from the target location flows; wherein, the greater the number of confluence points, the higher the priority; the drainage module is also used to select alternative time periods for the corresponding target location from the set of candidate time periods corresponding to the target location in descending order of priority.

[0016] By adopting the above technical solution, when selecting alternative time periods from the set of alternative time periods corresponding to the target location, the priority of each target location will be determined first. The corresponding time periods will be determined sequentially according to the priority from high to low. The priority is determined based on the number of confluence points through which the condensate discharged from the target location flows. If there are more confluence points, the time period of the flow will be determined first, so that subsequent target locations can use this as a benchmark and avoid overlapping with the time periods of the flow of previous target locations.

[0017] Preferably, the controller further includes a verification module, which is used to acquire water flow data at each confluence point in real time; the water flow data includes at least flow rate, flow velocity, and acquisition time; The verification module is also used to determine the actual time period when each target location flows through the corresponding confluence point based on the water flow data, and to calculate the time difference between the duration of the actual time period and the duration of the corresponding flow period. If the time difference is greater than the preset time difference, a first warning message will be issued to remind the operator that the liquid level detector at the corresponding target location is faulty.

[0018] By adopting the above technical solution, the water flow data at each confluence point is obtained in real time through the verification module, and this data is used to correspond to the actual time period when each target location flows through the confluence point. The actual time period is then compared with the previously determined time period of the target location. If the time difference is large, it is considered that the actual amount of water discharged at the target location is different from the amount of water required to reach the preset water level threshold or the highest water level threshold. In other words, it is considered that there is a large error in the water level detected by the liquid level sensor, and the first warning message is issued to remind the operator to check the liquid level detector for faults.

[0019] Preferably, each of the branch pipes is also equipped with a flow sensor. The flow sensor is used to detect the flow rate of condensate discharged into the branch pipe at the corresponding drainage position. The controller is electrically connected to the flow sensor. The controller is also used to acquire the flow rate data detected by the flow sensor and determine the ideal flow rate value corresponding to the opening of the drain valve according to the opening of the corresponding drain valve. If the difference between the ideal flow rate value and the flow rate data detected by the flow sensor is greater than a specified difference, a second warning message is issued to remind the operator that there is a fault in the drain valve at the corresponding target position.

[0020] By adopting the above technical solution, a flow sensor is installed at each drain valve to detect the flow rate data of the water discharged from the drain valve. Based on the pre-determined drain valve opening, the corresponding ideal flow rate value is determined. Then, the difference between the ideal flow rate value and the flow rate data detected by the flow sensor is calculated. If the difference is greater than a specified difference, it is considered that the flow rate data of the drain valve when discharging water according to the determined drain valve opening does not match the ideal flow rate value, and the drain valve is suspected to have malfunctioned. At this time, a second warning message is issued so that the operator can troubleshoot the corresponding drain valve.

[0021] Preferably, the controller further includes a control module, which is communicatively connected to the main control module. The control module is used to record the number of times each drainage location drains within a specified period, and to determine the adjusted location information of the water collection tank based on the number of drainages. The adjusted location information of the water collection tank satisfies the following condition: the more times a drainage location drains, the fewer the number of confluence points the water flows through as it flows to the adjusted water collection tank.

[0022] By adopting the above technical solution, an adjustment scheme for the location information of the water collection tank is output based on the number of times each drainage location drains within a specified period. The adjusted water collection tank satisfies the condition that the water discharged from the drainage location with the more drainage times has the fewest confluence points during its flow to the water collection tank. This reduces the computational complexity when the drainage location is used as the target location and the time period is determined.

[0023] Preferably, the control module is further configured to, each time the drainage time and drain valve opening of the target location are determined, if there is a target location with a drainage time corresponding to the latest drainage time, determine and output the recommended size of the water tank at the target location. The recommended size includes the product of the recommended length and width, and the product of the recommended length and width = (the product of the length and width of the water tank before adjustment * the preset water level threshold) / the highest water level threshold; wherein, the latest drainage time is the time when the water level of the water tank at the corresponding target location reaches the preset highest water level threshold.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. A water tank for collecting condensate is placed in advance at each location where condensate is likely to be generated. The water level in the tank is detected by a level detector. The controller determines whether to open the drain valve for drainage based on the water level data. If so, the drain valve is opened to drain the water. This replaces manual drainage and realizes automated intelligent drainage, avoiding the safety hazards caused by manual drainage. 2. This application utilizes a pipeline formed by branch pipes and a main pipe, allowing all condensate in the water storage tanks to be centrally discharged into the collection tank. Furthermore, based on this pipeline structure, all branch pipes are connected to the main pipe, meaning that all condensate in the water storage tanks will share a single pipeline (i.e., the main pipe) during its flow into the collection tank. This reduces the complexity and difficulty of pipeline layout, saving costs. On the other hand, this application achieves independent control of all drainage locations by controlling the opening and closing time of the drain valves. This scheme can achieve sequential drainage of all drainage locations in a "queueing" manner. When multiple drainage locations need to be drained simultaneously, it reduces the possibility of condensate merging and converging in the main pipe, thus reducing the impact on drainage flow rate. 3. The verification module acquires water flow data at each confluence point in real time and uses this data to correspond to the actual time period when the water flows through the confluence point at each target location. The actual time period is then compared with the previously determined time period when the water flows through the target location. If the time difference is large, it is considered that the actual amount of water discharged at the target location is different from the amount of water required to reach the preset water level threshold or the highest water level threshold. In other words, it is considered that there is a large error in the water level detected by the liquid level sensor, and the first warning message is issued to remind the operator to check the liquid level detector for faults. Attached Figure Description

[0025] Figure 1 This is a structural block diagram illustrating a drainage control system for a multi-shaft compressor in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram illustrating an applicable scenario for a drainage control system for a multi-axis compressor, as shown in the embodiments of this application.

[0027] Explanation of reference numerals in the attached diagram: 1. Controller; 11. Main control module; 12. Prediction module; 13. Drainage module; 14. Verification module; 15. Control module; 2. Liquid level detector; 3. Drain valve; 4. Temperature sensor; 5. Humidity sensor; 6. Flow sensor. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0029] This application discloses a drainage control system for a multi-shaft compressor. (Refer to...) Figure 1 and Figure 2The drainage control system of the multi-shaft compressor includes a water tank located at each preset drainage position. These preset drainage positions refer to locations where condensate is likely to be generated during the operation of the multi-shaft compressor. The water tank is positioned below the corresponding drainage position to collect the condensate dripping from that position. Each water tank has a branch pipe connected to its lower end, and each branch pipe is equipped with a drain valve 3 to control the connection between the water tank and the branch pipe. All the branch pipes of the water tanks are connected to a main pipe, which in turn connects to a collection tank. Each water tank also contains a level detector 2 to monitor the water level. All level detectors 2 are connected to a controller 1, and all drain valves 3 are controlled by the controller 1. The controller 1 controls the opening and closing of each drain valve 3 based on the water level data detected by the level detectors 2, so that when a drain valve 3 is open, the condensate in the corresponding water tank can be discharged into the collection tank through the main pipe, achieving automated drainage. Figure 2 The arrows in the diagram indicate the direction of water flow.

[0030] Reference Figure 1 and Figure 2 The controller 1 includes a main control module 11 and a prediction module 12. The liquid level detector 2 and the drain valve 3 are electrically connected to the main control module 11, and the prediction module 12 is communicatively connected to the main control module 11. The prediction module 12 is also electrically connected to a temperature sensor 4 and a humidity sensor 5, with at least one temperature sensor 4 and one humidity sensor 5 corresponding to each drain location to detect the temperature and humidity of the surrounding environment. The prediction module 12 pre-stores the weighted values ​​corresponding to each preset influencing factor, as well as the correspondence between the weighted sum and the probability of condensation formation. The corresponding influencing factors are at least temperature and humidity. Therefore, the prediction module 12 is used to acquire the detected temperature and humidity at each drain location at specified frequencies, calculate the weighted sum of the temperature and humidity values ​​based on the corresponding weighted values, and then determine the corresponding probability based on this value and the stored correspondence.

[0031] The main control module 11 is used to obtain the probability of condensation at each drainage location determined by the prediction module 12. When there is a drainage location with a probability greater than the preset probability value, the liquid level detector 2 at the corresponding drainage location is controlled to detect the water level data at a specified frequency until the probability of condensation at the drainage location determined by the subsequent prediction module 12 drops below the preset probability value.

[0032] Reference Figure 1 and Figure 2The controller 1 also includes a drainage module 13, which is communicatively connected to the main control module 11. The drainage module 13 acquires the water level data detected by the level detector 2 and determines whether a target location exists. A target location refers to a drainage location where the water level is higher than a preset water level threshold. The drainage module 13 is also used to determine the corresponding confluence point for each target location when one exists. The confluence point is the location where the condensate from the target location flows through the same branch pipe as the condensate from other target locations during its discharge into the collection tank, connecting the branch pipe to the main pipe. Figure 2 As shown, when there is Figure 2 When the target positions are d, e, and f, there are two confluence points for target position d. One confluence point is the location through which the condensate from target position d and target position e flows (i.e., confluence point a), and the other confluence point is the location through which the condensate from target position d and target position f flows (i.e., confluence point b).

[0033] Reference Figure 1 and Figure 2 The drainage module 13 is also used to determine the drainage time and the opening degree of the drainage valve 3 for each target location after determining the confluence point corresponding to each target location, and to calculate the flow time of the required drainage volume at each target location when it flows through the corresponding confluence point, so that the flow time of all target locations flowing through the same confluence point does not overlap. The flow time refers to the time period corresponding to all the condensate discharged from the target location flowing to the confluence point and completely passing through it. Here, the drainage time of the target location determined by the drainage module 13 can be considered as the starting point of drainage.

[0034] The main control module 11 is used to calculate the opening duration of the drain valve 3 at each target location after the drainage module 13 determines the drainage time and the opening degree of the drain valve 3 at each target location. The specific calculation method is as follows: based on the water level growth rate at the target location at the current moment, the time difference t between the determined drainage time of the target location and the current moment is calculated. Based on the time difference t and the water level growth rate, the water level difference is calculated. Therefore, the water level x at the target location when the drainage time is reached = preset water level threshold + water level difference; then, based on the product of the length and width of the water tank corresponding to the target location, the water volume m at the target location when the drainage time is reached (i.e., when the water level x is reached) is calculated. Finally, the opening duration of the drain valve 3 is calculated as m / the water volume flowing through the drain valve 3 per unit time when the drain valve 3 is opened according to the corresponding opening degree.

[0035] The main control module 11 is also used to control the corresponding drain valve 3 to open for a corresponding duration according to the opening degree of the corresponding drain valve 3 when the corresponding target position is drained, in order to achieve drainage.

[0036] Specifically, the method for determining the drainage time and the opening degree of the drainage valve 3 at each target location by the drainage module 13 is as follows: The drainage module 13 is used to calculate the flow time of each target location at the current time during which the corresponding drainage valve 3 is opened to a preset opening degree and a predetermined amount of water is discharged. It is also used to take the current time as the drainage time of all target locations and the preset opening degree as the opening degree of the drainage valve 3 corresponding to all target locations if there is no overlap between the flow time periods of all the calculated flow time periods of all target locations and the flow time periods of all target locations that flow through the same drainage valve 3.

[0037] The drainage module 13 is also used to determine the selection factor for each target location at the current time if there is an overlap in the flow periods corresponding to all target locations flowing through the same confluence point among all currently calculated flow periods. The selection factor includes at least a time factor and an opening factor. The time factor includes at least the latest drainage time for the corresponding target location at the current time. The latest drainage time refers to the time when the water level in the water tank at the corresponding target location reaches a preset maximum water level threshold, based on the water level increase rate at the current time, and the maximum water level threshold is greater than the preset water level threshold. The opening factor includes at least the minimum opening, preset opening, and maximum opening for the corresponding target location.

[0038] The drainage module 13 is used to select any combination of factors from the different factors included in the selection factors (i.e., the time factor and opening factor disclosed in this embodiment) to generate selection conditions, calculate the candidate time period corresponding to each selection condition, and combine all candidate time periods to generate a candidate time period set. For example, if the current time in the time factor and the maximum opening in the opening factor are combined to generate selection conditions, the corresponding candidate time period refers to the time period during which the discharged condensate flows through and completely passes through the confluence point during the opening time corresponding to the opening duration of the drainage valve 3 at the maximum opening at the current time.

[0039] Once the set of candidate time periods for each target location is determined, the drainage module 13 determines the priority of each target location based on the number of confluence points through which the condensate discharged from each target location flows. A higher number of confluence points results in a higher priority. The drainage module 13 also selects alternative time periods from the set of candidate time periods corresponding to each target location, in descending order of priority, to ensure that the time periods for all target locations flowing through the same confluence point do not overlap. The drainage module 13 further determines the time factor corresponding to the alternative time period as the drainage time for the corresponding target location, and the opening factor corresponding to the alternative time period as the opening degree of the drain valve 3 for the corresponding target location. Additionally, it should be noted that the main control module 11 may be pre-connected to a touchscreen display, allowing users to manually select alternative time periods by displaying the set of candidate time periods for all target locations.

[0040] Optionally, the controller 1 also includes a verification module 14, which is communicatively connected to the main control module 11. The verification module 14 is electrically connected to a flow velocity sensor and a flow rate sensor, and each location where a branch pipe intersects with the main pipe corresponds to at least one flow velocity sensor and one flow rate sensor, for real-time detection of the flow velocity and flow rate values ​​at the corresponding locations. The verification module 14 is used to acquire water flow data with flow velocity, flow rate, and acquisition time.

[0041] Since the location where each branch pipe and the main pipe intersect is necessarily the location of the confluence point corresponding to the target location during the flow of condensate from the target location to the collection tank, when the main control module 11 controls the drain valve 3 at the target location to open according to the opening time of the drain valve 3 according to the order of drainage time, the main control module 11 can send a verification signal to the verification module 14 so that the verification module 14 can obtain water flow data when it receives the verification signal until the target location with the latest drainage time completes drainage. The basis for the target location with the latest drainage time to complete drainage can be: the end time of the latest flow period among all the confluence points through which the condensate that reaches the target location with the latest drainage time flows at the current time.

[0042] The verification module 14 is used to determine the actual time period when each target location flows through the corresponding confluence point based on the water flow data, calculate the time difference between the actual time period and the corresponding flow period, and generate and issue a first warning message when the time difference is greater than the preset time difference. The first warning message includes at least the location information of the corresponding target location. In addition, the method for determining the actual time period and flow rate of each target location through the corresponding confluence point based on the water flow data is as follows: Based on the drainage time and opening degree of the drainage valve 3 corresponding to each target location determined by the drainage module 13, the water flow velocity (hereinafter referred to as y) when draining according to the opening degree of the corresponding drainage valve 3 is calculated. The water flow velocity y can be considered as the speed of the corresponding condensate when passing through the confluence point. When a flow velocity value (hereinafter referred to as q) that is similar to the water flow velocity y (e.g., the difference is not greater than the preset difference) appears in the water flow data detected at the confluence point corresponding to the target location, and the time difference between the acquisition time (hereinafter referred to as t') when the flow velocity value q first appears and the time period through the confluence point is not greater than the preset difference, it is considered that from time t' until the flow velocity value corresponding to the water flow data is not similar to the water flow velocity y, this period of time is the actual time period when the target location flows through the corresponding confluence point.

[0043] Optionally, each branch pipe is also equipped with a flow sensor 6. The flow sensor 6 is used to detect the flow rate data of the condensate discharged into the branch pipe at the corresponding drainage position. The controller 1 is electrically connected to the flow sensor 6. The controller 1 is also used to acquire the flow rate data detected by the flow sensor 6 and determine the ideal flow rate value corresponding to the opening degree of the drain valve 3 based on the opening degree of the drain valve 3 determined by the corresponding drain valve 3. If the difference between the ideal flow rate value and the flow rate data detected by the flow sensor 6 is greater than a specified difference, a second warning message is issued. The second warning message includes at least the location information of the corresponding target position.

[0044] Optionally, the controller 1 also includes a control module 15, which is communicatively connected to the main control module 11. The control module 15 is used to record the number of times each drainage location drains within a specified period (e.g., 24 hours), and also to determine the adjusted location information of the water collection tank based on the number of drainages. The adjusted location information of the water collection tank is then displayed on a pre-connected touchscreen display via the main control module 11. The display method can be as follows: Figure 2 The adjusted water collection tank is marked on the map shown. Furthermore, the location information of the adjusted water collection tank satisfies the following condition: the more times a drainage point is drained, the fewer confluence points the water flows through as it reaches the adjusted water collection tank.

[0045] Optionally, the control module 15 is further configured to, each time the drainage time and opening degree of the drain valve 3 at the target location are determined, if there is a target location with a drainage time corresponding to the latest drainage time, determine and output the recommended size of the water tank at that target location. The recommended size includes the product of the recommended length and width, and the product of the recommended length and width = (the product of the length and width of the water tank before adjustment * a preset water level threshold) / the highest water level threshold; wherein the latest drainage time is the time when the water level in the water tank at the corresponding target location reaches the preset highest water level threshold.

[0046] The implementation principle of a drainage control system for a multi-shaft compressor according to an embodiment of this application is as follows: A prediction module 12 predicts the probability of condensate generation at each drainage location. When a drainage location has a probability greater than a preset probability value, the level detector 2 at the corresponding drainage location is controlled to start detecting the water level in the corresponding water tank at a specified frequency until the probability of condensate generation at the corresponding drainage location drops below the preset probability value. The drainage module 13 acquires the water level data detected by the level detector 2, determines the drainage location with a water level higher than a preset water level threshold as the target location, and determines the drainage time, the opening degree of the drainage valve 3, and the opening duration of the drainage valve 3 at the target location. Finally, when the drainage time is reached at the current moment, the drainage valve 3 is controlled to open according to the determined opening degree, and the opening duration is the corresponding opening duration, so that the condensate at the target location is discharged into the water collection tank.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drainage control system for a multi-shaft compressor, characterized in that: The system includes water tanks, each corresponding to a preset drainage location. Each water tank is used to collect condensate from the corresponding drainage location. Each water tank is equipped with a drain valve (3) and a level detector (2). The level detector (2) and the drain valve (3) are electrically connected to a controller (1). The controller (1) includes a main control module (11), a prediction module (12), and a drainage module (13). The liquid level detector (2) and the drainage valve (3) are electrically connected to the main control module (11). The prediction module (12) and the drainage module (13) are communicatively connected to the main control module (11). The prediction module (12) is used to predict the probability of condensation at each drainage location at the current time based on a preset influence factor. The main control module (11) is used to control the liquid level detector (2) at the corresponding drainage location to detect water level data when the probability predicted by the prediction module (12) is greater than the preset probability value. All the water storage tanks are connected to a main pipe via straight pipes, and the main pipe is connected to a water collection tank; The drainage module (13) is used to acquire the water level data detected by the liquid level detector (2) and determine whether there is a target position with a water level data higher than the preset water level threshold. When there is a target position, the confluence point corresponding to each target position is determined, the drainage time and opening degree of the drainage valve (3) of each target position are determined, and the flow time period when the drainage volume required to be discharged at each target position flows through the corresponding confluence point is calculated so that the flow time periods corresponding to all target positions flowing through the same confluence point do not overlap. The term "convergence point" refers to the process by which condensate from the target location is discharged into the collection tank, and is the location through which condensate from other target locations flows and where the branch pipe and the main pipe intersect and connect. The main control module (11) is used to control the corresponding target positions to open and drain water according to the order of the drainage time of all target positions determined by the drainage module (13).

2. The drainage control system for the multi-shaft compressor according to claim 1, characterized in that: The influencing factors include at least the temperature and humidity of the surrounding environment where the drainage location is located.

3. The drainage control system for the multi-shaft compressor according to claim 1, characterized in that: During the process of determining the drainage time and the opening degree of the drainage valve (3) at each target location by the drainage module (13), the drainage module (13) is used to: Calculate the time period during which each target location flows through the corresponding confluence point at the current moment, controls the corresponding drain valve (3) to open to a preset degree, and discharges a predetermined amount of water; If the time periods corresponding to all target locations that flow through the same confluence point do not overlap in all the time periods calculated at the current time, then the current time is taken as the drainage time of all target locations, and the preset opening is taken as the opening of the drainage valve (3) corresponding to all target locations. If there is an intersection, then based on the selection factor of each target location at the current time, the selection factor includes at least the latest drainage time of the corresponding target location, the minimum opening degree of the corresponding target location, and the maximum opening degree; A set of alternative time periods for each target location is generated based on the selection factor. The set of alternative time periods includes several alternative time periods, and at least one of the alternative time periods is the time period when the drain valve (3) discharges a quantitative amount of condensate at the maximum opening when the target location is at the corresponding latest drainage time and flows through the corresponding confluence point. From the set of candidate time periods corresponding to each target location, select a candidate time period as the flow time period for the corresponding target location, so that there is no overlap between the flow time periods corresponding to all target locations flowing through the same confluence point; Then, based on the selection factor corresponding to the selected alternative time period, determine the drainage time and drainage valve (3) opening degree of the corresponding target location.

4. The drainage control system for the multi-shaft compressor according to claim 3, characterized in that: When the drainage module (13) selects a candidate time period for the corresponding target location from the set of candidate time periods corresponding to each target location, the drainage module (13) is used to: determine the priority of each target location based on the number of confluence points through which the condensate discharged from the target location flows; wherein, the larger the number of confluence points through which it flows, the higher the priority; the drainage module (13) is also used to select a backup time period for the corresponding target location from the set of candidate time periods corresponding to the target location in order of priority from high to low.

5. The drainage control system for the multi-shaft compressor according to claim 1, characterized in that: The controller (1) further includes a verification module (14), which is used to acquire water flow data at each confluence point in real time; the water flow data includes at least flow rate, flow velocity, and acquisition time. The verification module (14) is also used to determine the actual time period when each target location flows through the corresponding confluence point based on the water flow data, and to calculate the time difference between the duration of the actual time period and the duration of the corresponding flow period. It is also used to issue a first warning message if the time difference is greater than the preset time difference, so as to remind the operator that the liquid level detector (2) at the corresponding target position is faulty.

6. The drainage control system for the multi-shaft compressor according to claim 1, characterized in that: Each of the branch pipes is also equipped with a flow sensor (6), which is used to detect the flow data of condensate discharged into the branch pipe at the corresponding drainage position. The controller (1) is electrically connected to the flow sensor (6). The controller (1) is also used to acquire the flow data detected by the flow sensor (6) and determine the ideal flow value corresponding to the opening of the drain valve (3) based on the opening of the drain valve (3) determined by the corresponding drain valve (3). If the difference between the ideal flow value and the flow data detected by the flow sensor (6) is greater than a specified difference, a second warning message is issued to remind the operator that the drain valve (3) at the corresponding target position is faulty.

7. The drainage control system for the multi-shaft compressor according to claim 1, characterized in that: The controller (1) further includes a control module (15), which is communicatively connected to the main control module (11). The control module (15) is used to record the number of times each drainage location drains within a specified period, and to determine the output of the adjusted water collection tank based on the number of drainages. The adjusted water collection tank position information satisfies the following condition: the more drainage locations that drain, the fewer the number of water flow points the water flows through to the adjusted water collection tank.

8. The drainage control system for the multi-shaft compressor according to claim 7, characterized in that: The control module (15) is also used to determine and output the recommended size of the water tank at the target location when the drainage time and the opening of the drain valve (3) are determined each time. If there is a target location with a drainage time of the latest drainage time, the recommended size includes the product of the recommended length and width, and the product of the recommended length and width = (the product of the length and width of the water tank before adjustment * the preset water level threshold) / the highest water level threshold; wherein, the latest drainage time is the time when the water level of the water tank at the corresponding target location reaches the preset highest water level threshold.

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