Sewage collection equipment and control method thereof

Abstract

The invention discloses dirt collecting equipment and a control method thereof.The dirt collecting equipment comprises a draught fan and a pipeline and is used for being matched with N sets of movable dirt suction devices to work, the pipeline is provided with N inlets, and the inlets are selectively connected or disconnected with the corresponding movable dirt suction devices so that the working state of the dirt collecting equipment can be changed. According to the control method of the sewage collection equipment, the preset total air outlet quantity Qn is determined according to the relation that Qn = XQmax / N by determining the communicating number X of the inlets, and then the draught fan is controlled to operate at the appropriate target rotating speed Vn. Energy waste in a non-full-open working state is avoided, it can be guaranteed that under the working state that only part of inlets of the draught fan are opened, the provided flow meets the actual requirement for sucking dirt, the dirt collecting efficiency is improved, dirt cannot exceed too much, energy waste is reduced, and it is avoided that the draught fan runs in a low-efficiency state for a long time, and the service life of the draught fan is prolonged. And the service lives of the fan and the pipeline are prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial waste recycling, and in particular relates to a pollution collecting device and a control method thereof. Background Art

[0002] In the production operations in the prior art, mobile sewage suction devices are often used to automatically collect waste and dirt generated by the production line, and then the waste and dirt sucked by the mobile sewage suction devices are centrally recovered by sewage collection equipment for subsequent unified treatment.

[0003] Taking spinning machines for textile operations as an example, waste and dirt such as broken ends and fallen yarns are usually unavoidable during the operation. In order not to affect subsequent production, the generated waste and dirt need to be constantly cleaned out of the production line in a timely manner. In this case, multiple mobile sewage suction devices can be used to collect broken ends, fallen yarns, etc. scattered around the spinning machines on each production line. A sewage collection device is set at the head of the spinning machine. The collection device includes a pipe and a fan that provides negative pressure for the pipe. When the mobile sewage suction device passes the head of the machine, its boss device can open the valve and connect the pipe, so that the waste and dirt it collects are sucked away and recycled by the sewage collection equipment under the action of the fan. After the waste and dirt in the mobile sewage suction device are recovered, the mobile sewage suction device moves away from the head of the machine and continues the sewage suction operation. At this time, the valve automatically closes.

[0004] If the fan continues to run, the following defects may occur: when multiple mobile suction devices are away from the front of the vehicle, all the inlets of the pipeline are closed. At this time, the dust collection fan is still in operation, resulting in energy waste, and continuous suction in the closed pipeline will reduce the service life of the fan and pipeline.

[0005] Therefore, there is a method in the prior art to control the operation of the fan at a constant pressure, that is, by collecting the pressure at a certain point in the pipeline, the operating power of the fan is controlled by the pressure. When the pressure in the pipeline is lower than the set value, the operating power of the fan is increased until the pressure in the pipeline reaches the set pressure. When the pressure in the pipeline is higher than the set value, the operating power of the fan is reduced until the pressure in the pipeline reaches the set pressure. However, under non-rated working conditions, the flow rate provided by the fan may be less than the flow rate required to suck out the dirt in the mobile dust collection device, and the dust collection effect is poor. Summary of the Invention

[0006] The present invention provides a sewage collection device and a control method thereof, which can ensure dust collection effect, avoid energy waste, and increase the service life of a fan and a pipeline.

[0007] To achieve the above-mentioned object, the present invention provides a control method for sewage collection equipment, wherein the sewage collection equipment includes a fan and a pipeline, the sewage collection equipment is used to cooperate with N groups of mobile sewage suction devices, the pipeline has N inlets, each of the inlets can be selectively connected or disconnected with a corresponding mobile sewage suction device to change the working state of the sewage collection equipment, wherein N is a positive integer greater than or equal to 2;

[0008] The control method includes:

[0009] Obtaining a current working state of the sewage collection device according to the connection or disconnection state of the N inlets; wherein, in the current working state, X of the N inlets are connected;

[0010] When X is greater than or equal to 1 and less than N, the fan is controlled to operate at a target speed Vn corresponding to the current operating state, so that the expected total air output of the duct is the preset total air output Qn; wherein Qn = X*Qmax / N, Qmax is the preset maximum total air output of the duct when all N inlets are connected.

[0011] Optionally, when X is greater than or equal to 1 and less than N, the step of controlling the fan to operate at a target speed Vn corresponding to the current operating state, so that the estimated total air output of the duct is a preset total air output Qn; wherein Qn=X*Qmax / N, and Qmax is a preset maximum total air output of the duct when all N inlets are connected, is as follows:

[0012] When X is greater than or equal to 1 and less than N, the fan is controlled to operate at a target speed Vn corresponding to the current operating state, so that the estimated total air output of the duct is a preset total air output Qn; wherein Qn = X * Qmax / N, where Qmax is the preset maximum total air output of the duct when all N inlets are connected and the fan operates at a preset maximum speed Vmax;

[0013] The method further comprises: obtaining the current working state of the sewage collection device according to the connection or separation state of the N inlets; wherein, in the current working state, after the step of X of the N inlets are connected, the method further comprises:

[0014] When X=N, the fan is controlled to operate at a preset maximum speed Vmax according to the current working state.

[0015] Optionally, the maximum rotational speed Vmax is the rated rotational speed V0 of the fan.

[0016] Optionally, the step of obtaining the current working state of the sewage collection device according to the connection or disconnection state of the N inlets further comprises:

[0017] When X is equal to 0, the fan is controlled to stop working, or the fan is controlled to work at a minimum speed Vmin according to the current working state.

[0018] Optionally, when X is greater than or equal to 1 and less than N, the step of controlling the fan to operate at a target speed Vn corresponding to the current operating state, so that the estimated total air output of the duct is a preset total air output Qn; wherein Qn=X*Qmax / N, and Qmax is a preset maximum total air output of the duct when all N inlets are connected, includes:

[0019] When X is greater than or equal to 1 and less than N, the current pipe network resistance curve corresponding to the current working state is determined according to the current working state;

[0020] Obtaining the target speed Vn corresponding to the current working state according to the current pipe network resistance curve, the preset fan characteristic curve, and the preset total air output Qn;

[0021] The fan is controlled to operate at the target rotation speed Vn corresponding to the current operating state.

[0022] Optionally, each of the working states corresponds to a preset pipe network resistance curve.

[0023] Optionally, the pipe network resistance of the pipeline between each of the inlets and the outlets is the same;

[0024] Each set of the working states corresponds to a preset pipe network resistance curve, and in each set of the working states, the number X of the connected inlets is the same.

[0025] Optionally, the step of obtaining the target speed Vn corresponding to the current working state according to the current pipe network resistance curve, the preset fan characteristic curve, and the preset total air output Qn includes:

[0026] Obtain a preset total air volume Qn, obtain a preset fan characteristic curve, the fan characteristic curve including an air volume-air pressure relationship at a rated speed V0, and determine a rated total air volume Q0 corresponding to the rated speed V0 based on the fan characteristic curve and the current pipe network resistance curve;

[0027] According to the rated speed V0 and the rated total air volume Q0, the current speed V1 corresponding to the preset total air volume Qn is calculated according to the similarity law, where V1 = V0*Qn / Q0;

[0028] Scaling the fan characteristic curve at the rated speed V0 to the fan characteristic curve at the current speed V1 according to the similarity law;

[0029] Determine the current air volume Q1 corresponding to the current speed V1 according to the fan characteristic curve at the current speed V1 and the current pipe network resistance curve;

[0030] Calculate the air volume deviation between the current air volume Q1 and the preset total air volume Qn;

[0031] When the air volume deviation value is within a preset difference range, the current rotation speed V1 is used as the target rotation speed Vn.

[0032] Optionally, after the step of calculating the air volume deviation value between the current air volume Q1 and the preset total air volume Qn, the method further includes:

[0033] When the air volume deviation exceeds the preset difference range, the speed V2 is adjusted according to the similarity law, where V2 = V1*Qn / Q1;

[0034] The adjusted speed V2 is used as the new current speed V1, and the process returns to the step of scaling the fan characteristic curve at the rated speed V0 to the fan characteristic curve at the current speed V1 according to the similarity law.

[0035] In order to achieve the above object, the present invention provides a sewage collection device, comprising:

[0036] at least one processor; and,

[0037] a memory communicatively connected to the at least one processor; wherein,

[0038] The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to perform the control method for the sewage collection equipment as described above.

[0039] The technical solution provided by the present invention has the following advantages:

[0040] The sewage collection equipment provided by the present invention includes a fan and a pipeline, which is used to cooperate with N groups of mobile sewage suction devices. The pipeline has N inlets, and each inlet can be selectively connected or disconnected with a corresponding mobile sewage suction device to change the operating state of the sewage collection equipment. The sewage collection equipment control method includes: obtaining the current operating state of the sewage collection equipment based on the connection or disconnection state of the N inlets, wherein X of the N inlets are connected in the current operating state, and when X is greater than or equal to 1 and less than N, controlling the fan to operate at a target speed Vn corresponding to the current operating state, so that the expected total air output of the pipeline is a preset total air output Qn, where Qn = X*Qmax / N, where Qmax is the preset maximum total air output of the pipeline when all N inlets are connected.

[0041] In the embodiment provided by the present invention, by determining the number X of connected inlets, the preset total air volume Qn is determined based on the relationship Qn=XQmax / N, and then the fan is controlled to operate at an appropriate target speed Vn. Compared with the fixed-frequency operation method of the fan in the prior art, this embodiment can adjust the fan speed according to the pipeline connection situation, avoiding energy waste in a non-fully open working state. Compared with the constant pressure adjustment method, this embodiment can accurately match the air volume requirements under different working conditions. In the working state where only some inlets are open, it can ensure that the flow rate provided by the fan meets the actual needs of sucking out waste, and will not provide too high a negative pressure to cause waste. For example, when some mobile sewage suction devices are away from the front of the vehicle and the number of pipeline inlets connected is reduced, the fan speed can still be adjusted according to the actual inlet connection situation to ensure that each connected mobile sewage suction device can obtain sufficient suction force, improve the sewage collection efficiency, and avoid the fan from operating in a low-efficiency state for a long time, thereby extending the service life of the fan and the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 This is a schematic structural diagram of an embodiment of the sewage collection equipment of the present invention;

[0044] Figure 2 This is a schematic diagram of a first embodiment of a method for controlling a sewage collection device according to the present invention;

[0045] Figure 3 A schematic diagram of a second embodiment of a method for controlling a sewage collection device according to the present invention;

[0046] Figure 4Schematic diagram of a third embodiment of a method for controlling a sewage collection device according to the present invention;

[0047] Figure 5 Schematic diagram of a fourth embodiment of a method for controlling a sewage collection device according to the present invention;

[0048] Figure 6 Schematic diagram of a fifth embodiment of a method for controlling a sewage collection device according to the present invention;

[0049] Figure 7 A schematic diagram of an embodiment of a sewage collection device;

[0050] Figure 8 This is a schematic diagram of the principle of determining the target speed based on the fan characteristic curve and the pipe network resistance curve;

[0051] Figure 9 Schematic diagram of the relationship between the pre-stored fan characteristic curve and the actual operating point in one embodiment.

[0052] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0053] Description of Figure Numbers:

[0054] 1-pollution collection equipment; 11-pipeline; 111-inlet; 112-outlet; 12-fan; 2-spinning frame; 21-production line; 211-guide rail; 22-mobile suction device; 31-processor; 32-memory. DETAILED DESCRIPTION

[0055] In embodiments of the present invention, the term "and / or" describes the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0056] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0057] In the embodiments of the present invention, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be understood by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable the reader to better understand the present invention. However, even without these technical details and the various changes and modifications based on the following embodiments, the technical solutions claimed in the present invention can be implemented. The division of the following embodiments is for convenience of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with each other and referenced to each other under the premise that there is no contradiction.

[0059] The present invention provides a waste collection device 1 for centrally collecting waste generated during production operations for subsequent processing. The specific type of production operation is not limited; any production line 21 requiring waste recycling can employ the waste collection device 1 provided in this embodiment.

[0060] The following is an example of spinning operation performed by a spinning frame 2. In the spinning production operation, waste materials such as broken yarn and falling yarn are usually unavoidable. In order not to affect subsequent production, the waste materials need to be cleaned out of the production line 21 in a timely manner. Figure 1As shown, the spinning frame 2 includes N production lines 21, where N is a positive integer greater than or equal to 2. In this embodiment, N is equal to 4. Each production line 21 correspondingly uses a mobile suction device 22 to collect broken yarns, fallen yarns, etc. scattered around the spinning frame 2. Specifically, guide rails 211 can be arranged along the production lines 21, and the mobile suction device 22 reciprocates along the guide rails 211 to suck waste and dirt generated during the production process. The dirt collection device 1 provided by the present invention is arranged at the head position of the spinning frame 2, specifically at the end position of multiple production lines 21, and works in conjunction with the N groups of mobile suction devices 22. The sewage collection device 1 specifically includes a pipeline 11 and a fan 12 that provides negative pressure for the pipeline 11. The pipeline 11 has N inlets 111 and an outlet 112. Each inlet 111 can be selectively connected or disconnected with the corresponding mobile sewage suction device 22 to change the working state of the sewage collection device 1. The fan 12 drives the airflow from each inlet 111 to the outlet 112, sucking the waste and dirt in each mobile sewage suction device 22 to the outlet 112 for subsequent centralized recovery and processing. Specifically, each inlet 111 can be provided with a valve or other device that controls the opening and closing of the inlet 111. When the mobile sewage suction device 22 passes the front of the vehicle, its boss device can open the valve and connect the pipeline 11, so that the waste and dirt collected by it are sucked away and recycled by the sewage collection device 1 under the action of the fan 12. After the waste and dirt in the mobile sewage suction device 22 are recovered, or after a preset time period, the mobile sewage suction device 22 moves away from the front of the vehicle and continues to perform sewage suction operations, and the valve automatically closes at this time. According to the opening and closing status of each inlet 111, the sewage collection device 1 has at least a fully open working state in which all inlets 111 are open, a fully closed working state in which all inlets 111 are closed, and multiple working states in which at least one inlet 111 is open.

[0061] It can be understood that the fan 12 should adjust its speed according to the specific working state of the sewage collection equipment 1 to avoid energy waste in a non-fully open working state. However, the constant pressure control method used in the prior art has the defect that under non-rated working conditions, the flow rate provided by the fan 12 may be less than the flow rate required to suck the dirt in the mobile dust collection device, resulting in poor dust collection effect.

[0062] In order to solve the above technical problems, the present invention provides a control method for sewage collection equipment.

[0063] The following describes the implementation details of the first embodiment of the control method for sewage collection equipment provided by the present invention. The following content is only provided for ease of understanding and is not necessary for implementing this solution.

[0064] The specific process of this embodiment is as follows Figure 2 As shown, specifically including:

[0065] Step S1, obtaining the current working state of the sewage collection device according to the connection or separation state of the N inlets; wherein, in the current working state, X of the N inlets are connected.

[0066] In this step, the working state is related to the number and position of the connected inlets, that is, when the resistance of the pipe network changes, the working state is also switched accordingly. In a specific implementation, there can be many ways to obtain the connection or separation status of each inlet. For example, a micro switch can be installed at the connection between each mobile sewage suction device and the pipeline inlet. When the mobile sewage suction device approaches and connects to the pipeline, the micro switch is triggered, causing the normally open contacts inside it to close, generating an electrical signal change. The control system of the sewage collection equipment is connected to these micro switches. By detecting the electrical signal status of each micro switch and counting the number of micro switches in the closed state, the number X and position of the connected inlets can be determined, thereby obtaining the current working state of the sewage collection equipment. Photoelectric sensors, wind pressure sensors, etc. set at the inlet can also be used to determine the connection status of the inlet by detecting the electrical signal changes of the sensor.

[0067] Step S2: When X is greater than or equal to 1 and less than N, the fan is controlled to operate at a target speed Vn corresponding to the current working state, so that the expected total air output of the duct is a preset total air output Qn; wherein Qn = X*Qmax / N, Qmax is the preset maximum total air output of the duct when all N inlets are connected.

[0068] In this step, when X is greater than or equal to 1 and less than N, the sewage collection equipment is in a state where some of its inlets are connected. The target speed Vn corresponding to the working state can be obtained in a variety of ways. For example, the mapping relationship between the preset multiple working states and multi-level target speeds is stored in the control system before leaving the factory. After determining the current working state, the target speed Vn that can enable the fan to produce a preset total air output Qn can be found by querying the data. Finally, the control system adjusts the fan so that it runs at the target speed Vn. In specific implementation, the fan speed can be adjusted by a variable frequency speed regulation device or a speed control clutch.

[0069] In this embodiment, the preset total air volume Qn is determined by determining the number of connected inlets X, based on the relationship Qn = XQmax / N, and the fan is then controlled to operate at an appropriate target speed Vn. Compared to the prior art method of fan fixed-frequency operation, this embodiment can adjust the fan speed based on the pipeline connection status, avoiding energy waste in the non-fully open operating state. Compared with the constant pressure regulation method, this embodiment can accurately match the air volume requirements under different operating conditions. When only some inlets are open, the fan flow rate is guaranteed to meet the actual suction demand while ensuring that the fan speed does not exceed the actual demand and cause waste. For example, for a sewage collection device with four inlets, when only one inlet is open, the preset total air volume Qn is equal to 1 / 4Qmax. When two inlets are open, Qn is equal to 1 / 2Qmax. In other words, the air volume provided by the fan increases according to the number of open inlets X. In this way, under different operating conditions, the total air volume Qn of the pipeline is always adapted to the sewage collection demand of the mobile sewage suction device. In this way, when some mobile sewage suction devices are away from the front of the vehicle and the number of connected pipe inlets is reduced, the fan speed can still be adjusted according to the actual inlet connection situation to ensure that each connected mobile sewage suction device can obtain sufficient suction force, improve the sewage collection efficiency, and avoid the fan running in a low-efficiency state for a long time, thereby extending the service life of the fan and pipeline.

[0070] Based on the above first embodiment, a second embodiment of a control method for a sewage collection device is proposed. The specific process of this embodiment is as follows: Figure 3 shown.

[0071] In this embodiment, the step S2 is specifically as follows:

[0072] Step S2': when X is greater than or equal to 1 and less than N, the fan is controlled to operate at a target speed Vn corresponding to the current operating state, so that the estimated total air output of the duct is a preset total air output Qn; wherein Qn = X*Qmax / N, Qmax is the preset maximum total air output of the duct when all N inlets are connected and the fan operates at the maximum speed Vmax.

[0073] In this step, Qmax refers to the preset maximum total air output of the pipeline when all N inlets are connected (i.e., in the fully open working state) and the fan is working at the preset maximum speed Vmax. Among them, the maximum speed of the fan Vmax can be related to the characteristics of the motor and the probability of the fully open working state. When the probability of the motor being in the fully open working state is not high, the maximum speed of the fan Vmax can be set to be higher than the rated speed of the fan. Preferably, the maximum speed Vmax is the maximum operating speed that can be achieved within the design and safety range. At this time, the air volume and pressure output by the fan are the largest, which is used to meet the maximum sewage collection requirements when all inlets are connected. Since the probability of the fully open working state is not high, there are not many cases where the fan is overloaded. In this way, both the sewage collection efficiency and the protection requirements of the fan can be taken into account.

[0074] Preferably, when the probability of the motor being in the fully-on operating state is relatively high, the maximum speed Vmax is defined as the rated speed V0 of the fan. In other words, when in the fully-on operating state, the fan runs at the rated speed V0. This can achieve the purpose of efficient dust collection while protecting the fan and extending its service life.

[0075] After step S1, the following steps are also included:

[0076] Step S3: When X=N, the fan is controlled to operate at a preset maximum speed Vmax according to the current working state.

[0077] In this embodiment, when all inlets are connected, the fan operates at the maximum speed Vmax, fully utilizing the maximum collection capacity of the sewage collection equipment and quickly collecting large amounts of waste. In other operating conditions where inlets are connected, the flow rate of each inlet provided by the fan rotation matches the preset maximum total air output Qmax in the fully open operating state. In this way, when some mobile sewage suction devices are away from the front of the vehicle and the number of connected pipeline inlets decreases, the fan speed can still be adjusted according to the actual inlet connection status to ensure that each connected mobile sewage suction device can obtain sufficient suction force, improve sewage collection efficiency, avoid the fan from operating in a low-efficiency state for a long time, and extend the service life of the fan and pipeline.

[0078] Based on the above first embodiment, a third embodiment of a control method for a sewage collection device is proposed. The specific process of this embodiment is as follows: Figure 4 shown.

[0079] In this embodiment, after step S1, the following steps are further included:

[0080] Step S4: when X is equal to 0, the fan is controlled to stop working, or the fan is controlled to operate at a minimum speed Vmin according to the current working state.

[0081] In this step, in an optional embodiment, when X equals 0, meaning the sewage collection equipment is fully closed, the fan can be controlled to operate at a minimum speed, Vmin. Vmin is the lowest speed at which the fan can operate stably. This maintains a constant airflow within the duct when all inlets are closed, preventing problems such as impurity deposition and odor accumulation. It also avoids frequent fan starts and stops, extending the fan's service life.

[0082] In another alternative embodiment, when X equals 0, i.e., the sewage collection device is in a fully closed state, the fan can be controlled to stop operating to achieve energy conservation. Preferably, the position of the mobile sewage suction device can be detected by an ultrasonic sensor, etc., and when the mobile sewage suction device approaches a certain distance from the inlet, the fan can be triggered to start in advance to avoid insufficient suction when the mobile sewage suction device is connected to the pipeline.

[0083] In this embodiment, when the inlets are not connected, the fan is controlled to run at the minimum speed or stop running, which reduces unnecessary energy waste. The sewage collection equipment can also better adapt to different production scenarios, further improving the overall production efficiency and equipment life.

[0084] Based on any of the above embodiments, a fourth embodiment of a method for controlling a sewage collection device is proposed.

[0085] like Figure 5 As shown, in this embodiment, step S2 includes:

[0086] Step S21: when X is greater than or equal to 1 and less than N, determine the current pipe network resistance curve corresponding to the current working state according to the current working state.

[0087] In this step, the pipe network resistance curve represents the relationship between resistance loss and flow rate in the pipe system. Its value depends on factors such as the pipe geometry, roughness, length, and fluid properties. Specifically, the pipe network characteristics can be expressed using the following formula:

[0088] ΔP=S·Q 2

[0089] Where S is the comprehensive resistance coefficient related to the pipeline's longitudinal resistance and geometry. It is related to the pipeline installation, fluid properties, and flow resistance. The larger the S value, the steeper the curve. For the same flow rate, the greater the pipeline resistance to be overcome, the greater the fan work required, and the greater the fan power consumption.

[0090] In this embodiment, different operating states correspond to different pipe network resistance curves. The corresponding pipe network resistance curve for each operating state can be pre-stored in the control system before shipment. Alternatively, after the sewage collection equipment is installed, the resistance curve can be obtained by controlling the fan to run at the designed speed for a test run while simultaneously recording the changes in duct air volume and pressure.

[0091] Step S22: Obtain the target rotation speed Vn corresponding to the current working state according to the current pipe network resistance curve, the preset fan characteristic curve, and the preset total air output Qn.

[0092] In this step, the fan characteristic curve describes the relationship between the fan output air volume, wind pressure and other performance parameters at different speeds, and is used to determine the fan's operating performance under specific working conditions. In this embodiment, the preset fan characteristic curve is pre-stored in the control system before leaving the factory. Figure 8 According to the current pipe network resistance curve and the preset total air output Qn, the actual working point (Qn, Pn) under the current working state can be obtained. Combined with the fan characteristic curve passing through the actual working point (Qn, Pn), the target speed Vn corresponding to the current working state can be obtained.

[0093] As you can understand, due to the different locations of the inlets in the pipeline, the cross-sectional shape, size, length, and other parameters of the pipeline from each inlet to the outlet also vary. Consequently, when the corresponding inlets are opened, the pipeline network resistance also varies. Therefore, in general, each operating state corresponds to a preset pipeline network resistance curve. This configuration allows the fan speed to be precisely adjusted in each operating state, and the air output in each operating state is most accurately matched to the operating state.

[0094] Preferably, if Figure 1 As shown, by designing the pipeline, the inlets can be evenly arranged around the circumference of the outlet, that is, the parameters such as the cross-sectional shape, size, length, bending method, etc. of the pipeline from the outlet to each inlet are also basically the same. Then when the number of open inlets is the same, the pipeline network resistance curve is also roughly the same. Therefore, in this embodiment, each group of working states corresponds to a preset pipeline network resistance curve, and in each group of working states, the number X of connected inlets is the same. Such a setting can, on the one hand, reduce the data storage capacity of the pipeline network characteristic curve and reduce the computing pressure. On the other hand, in each working state, the air intake of each inlet is closer, the air intake distribution is more uniform, more in line with actual production needs, and higher sewage collection efficiency.

[0095] Step S23: Control the fan to operate at the target speed Vn corresponding to the current operating state.

[0096] This embodiment determines the wind pressure Pn corresponding to the preset total air volume Qn by determining the pipe network resistance curve, thereby obtaining the actual operating point under the current operating state. The target speed Vn is determined by determining the fan characteristic curve passing through the actual operating point, thereby more accurately matching the fan's target speed Vn with the current operating state. In different production environments, pipe resistance can vary. This embodiment can promptly adjust the fan speed to ensure the stability of the sewage collection effect. Precise speed control further improves energy efficiency, reduces equipment losses, and extends the service life of the fan and pipeline.

[0097] Based on the previous embodiment, if the target speed Vn is obtained by directly querying the preset fan characteristic curve, there is a problem that the target speed Vn cannot be accurately matched with the required air volume Qn. This is because the system cannot pre-store the fan characteristic curves at all speeds, such as Figure 9 As shown in the figure, the pipe network resistance curve under the current operating state (yellow curve in the figure) is illustrated, and the red solid point on it represents the actual operating point (Qn, Pn) under the current operating state. When the system has pre-existing fan characteristic curves at rated speed V0 (blue curve V0 in the figure) and 0.95V0 (orange curve 0.95V0 in the figure), neither of the above two curves passes through the actual operating point, and therefore it is impossible to accurately match the required target speed Vn based on the actual operating point (Qn, Pn).

[0098] In order to solve the above problems, a fifth embodiment of a control method for a sewage collection device is proposed. Figure 6 As shown, in this embodiment, step S22 includes:

[0099] Step S221, obtain the preset total air output Qn, obtain the preset fan characteristic curve, the fan characteristic curve includes the air volume-air pressure relationship under the rated speed V0, and determine the rated total air output Q0 corresponding to the rated speed V0 based on the fan characteristic curve and the current pipe network resistance curve.

[0100] In this step, for each working state, the control system only pre-stores the fan characteristic curve at the rated speed, while the corresponding fan characteristic curves at other speeds can be obtained through the similarity theorem.

[0101] Step S222 , based on the rated speed V0 and the rated total air volume Q0 , calculate the current speed V1 corresponding to the preset total air volume Qn according to the similarity law, where V1 = V0 * Qn / Q0 .

[0102] Step S223 : scaling the fan characteristic curve at the rated speed V0 to the fan characteristic curve at the current speed V1 according to the similarity law.

[0103] According to the similarity law, the fan speed is proportional to the air volume. In this step, given the rated speed V0, rated total air volume Q0, and preset total air volume Qn, the current speed V1 corresponding to the preset total air volume Qn is calculated using the formula V1 = V0 * Qn / Q0.

[0104] Step S224 , determining the current air volume Q1 corresponding to the current speed V1 according to the fan characteristic curve at the current speed V1 and the current pipe network resistance curve.

[0105] In this step, the fan characteristic curve at the current speed V1 and the current pipe network resistance curve are plotted on the same coordinate graph. The intersection of the two is found. The air volume corresponding to this intersection is the current air volume Q1 corresponding to the current speed V1. In actual operation, the control system uses a graphics processing algorithm to simulate the two curves on a virtual coordinate graph and calculate the coordinates of the intersection to obtain the current air volume Q1.

[0106] Step S225 , calculating the air volume deviation value between the current air volume Q1 and the preset total air volume Qn.

[0107] In this step, the difference between the current air volume Q1 and the preset total air volume Qn is calculated to obtain the air volume deviation value. The control system subtracts the values ​​of Q1 and Qn through a subtraction operation, and the result is the air volume deviation value.

[0108] Step S226: When the air volume deviation value is within a preset difference range, the current rotation speed V1 is used as the target rotation speed Vn.

[0109] In a specific implementation, the control system pre-sets an allowable range for air volume deviation (e.g., ±5 cubic meters per hour). When the calculated air volume deviation value is within the preset difference range, the current speed V1 is considered to meet the actual demand and is set as the target speed Vn, and the fan is controlled to operate at this speed.

[0110] Based on the above examples, please continue to refer to Figure 6 , after step S225, further comprising:

[0111] Step S227 : When the air volume deviation exceeds the preset difference range, the speed V2 is adjusted according to the similarity law, where V2 = V1*Qn / Q1.

[0112] In this step, when the air volume deviation exceeds the preset difference range, the control system calculates the adjusted speed V2 according to the similarity law using the formula V2 = V1 * Qn / Q1. The control system again performs numerical calculations through the calculation module, substituting the values ​​of V1, Qn, and Q1 into the formula to obtain the adjusted speed V2.

[0113] Step S228: Use the adjusted rotational speed V2 as the new current rotational speed V1, and return to step S223.

[0114] The adjusted speed V2 is used as the new current speed V1, and the system returns to step S223 to rescale the fan characteristic curve, determine the current air volume Q1, and calculate the air volume deviation value until the air volume deviation value is within the preset range. In actual operation, the control system implements this process through loop instructions. Each loop recalculates the relevant parameters based on the new current speed V1, continuously optimizing the fan speed to ensure that the final target speed Vn ensures that the fan produces an air volume close to the preset total air volume Qn.

[0115] This embodiment adjusts and calculates the fan characteristic curve multiple times based on the similarity law. First, the initial current speed V1 is calculated based on the preset total air volume Qn and the rated parameters, and the fan characteristic curve is scaled to obtain the current air volume Q1. By comparing the deviation values ​​of Q1 and Qn, it is determined whether the current speed is appropriate. If it is not appropriate, the speed is adjusted according to the similarity law and recalculated until the deviation value is within the preset range to determine the target speed Vn. This process continuously optimizes the fan speed so that its output air volume is closer to the actual demand. Compared with the previous embodiment, this embodiment can more accurately determine the target speed Vn through precise calculations and multiple iterative optimizations. In addition, the control system only needs to pre-store the characteristic curve of the fan at the rated speed, which reduces the computational burden of the control system.

[0116] The present invention also provides a sewage collection device, such as Figure 7 As shown, the sewage collection device includes at least one processor 31; and a memory 32 communicatively connected to the at least one processor 31; wherein the memory 32 stores instructions that can be executed by the at least one processor 31, and the instructions are executed by the at least one processor 31 so that the at least one processor 31 can execute the control method of the above-mentioned sewage collection device.

[0117] The memory 32 and processor 31 are connected using a bus. The bus can include any number of interconnected buses and bridges, connecting various circuits of one or more processors 31 and memory 32. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits. These are all well known in the art and, therefore, will not be described further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be a single component or multiple components, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by the processor 31 is transmitted over a wireless medium via an antenna. Furthermore, the antenna receives data and transmits it to the processor 31.

[0118] The processor 31 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 32 can be used to store data used by the processor 31 when performing operations.

[0119] In order to achieve the above object, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above coffee machine control method when executed by a processor.

[0120] That is, those skilled in the art will understand that all or part of the steps in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a program, which is stored in a storage medium and includes a number of instructions for causing a device (which may be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., various media that can store program code.

[0121] Obviously, the embodiments described above are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, those skilled in the art may make other different forms of changes or modifications without making any creative work, and all of these should fall within the scope of protection of the present invention.

Claims

1. A method for controlling a sewage collection device, characterized in that: The sewage collection equipment includes a fan and a pipeline, and is used to cooperate with N groups of mobile sewage suction devices. The pipeline has N inlets, and each inlet can be selectively connected or disconnected with a corresponding mobile sewage suction device to change the working state of the sewage collection equipment, wherein N is a positive integer greater than or equal to 2; The control method includes: Obtaining a current working state of the sewage collection device according to the connection or disconnection state of the N inlets; wherein, in the current working state, X of the N inlets are connected; When X is greater than or equal to 1 and less than N, the fan is controlled to operate at a target speed Vn corresponding to the current operating state, so that the expected total air output of the duct is the preset total air output Qn; wherein Qn = X*Qmax / N, Qmax is the preset maximum total air output of the duct when all N inlets are connected.

2. The method for controlling the sewage collection equipment according to claim 1, wherein: When X is greater than or equal to 1 and less than N, the fan is controlled to operate at a target speed Vn corresponding to the current operating state, so that the estimated total air output of the duct is a preset total air output Qn; wherein Qn=X*Qmax / N, and Qmax is the preset maximum total air output of the duct when all N inlets are connected. The steps are: When X is greater than or equal to 1 and less than N, the fan is controlled to operate at a target speed Vn corresponding to the current operating state, so that the estimated total air output of the duct is a preset total air output Qn; wherein Qn = X * Qmax / N, where Qmax is the preset maximum total air output of the duct when all N inlets are connected and the fan operates at a preset maximum speed Vmax; The method further comprises: obtaining the current working state of the sewage collection device according to the connection or separation state of the N inlets; wherein, in the current working state, after the step of X of the N inlets are connected, the method further comprises: When X=N, the fan is controlled to operate at a preset maximum speed Vmax according to the current working state.

3. The method for controlling the sewage collection equipment according to claim 2, wherein: The maximum rotation speed Vmax is the rated rotation speed V0 of the fan.

4. The method for controlling the sewage collection equipment according to claim 1, wherein: The method further comprises: obtaining the current working state of the sewage collection device according to the connection or separation state of the N inlets; wherein, in the current working state, after the step of X of the N inlets are connected, the method further comprises: When X is equal to 0, the fan is controlled to stop working, or the fan is controlled to work at a minimum speed Vmin according to the current working state.

5. The method for controlling a sewage collection device according to any one of claims 1 to 4, wherein: When X is greater than or equal to 1 and less than N, the step of controlling the fan to operate at a target speed Vn corresponding to the current operating state so that the estimated total air output of the duct is a preset total air output Qn; wherein Qn=X*Qmax / N, and Qmax is a preset maximum total air output of the duct when all N inlets are connected comprises: When X is greater than or equal to 1 and less than N, the current pipe network resistance curve corresponding to the current working state is determined according to the current working state; Obtaining the target speed Vn corresponding to the current working state according to the current pipe network resistance curve, the preset fan characteristic curve, and the preset total air output Qn; The fan is controlled to operate at the target rotation speed Vn corresponding to the current operating state.

6. The method for controlling the sewage collection equipment according to claim 5, characterized in that: Each of the working states corresponds to a preset pipe network resistance curve.

7. The method for controlling the sewage collection equipment according to claim 5, wherein: The pipe network resistance of the pipeline between each of the inlets and the outlets is the same; Each set of the working states corresponds to a preset pipe network resistance curve, and in each set of the working states, the number X of the connected inlets is the same.

8. The method for controlling the sewage collection equipment according to claim 5, wherein: The step of obtaining the target speed Vn corresponding to the current working state according to the current pipe network resistance curve, the preset fan characteristic curve, and the preset total air output Qn includes: Obtain a preset total air volume Qn, obtain a preset fan characteristic curve, the fan characteristic curve including an air volume-air pressure relationship at a rated speed V0, and determine a rated total air volume Q0 corresponding to the rated speed V0 based on the fan characteristic curve and the current pipe network resistance curve; According to the rated speed V0 and the rated total air volume Q0, the current speed V1 corresponding to the preset total air volume Qn is calculated according to the similarity law, where V1 = V0*Qn / Q0; Scaling the fan characteristic curve at the rated speed V0 to the fan characteristic curve at the current speed V1 according to the similarity law; Determine the current air volume Q1 corresponding to the current speed V1 according to the fan characteristic curve at the current speed V1 and the current pipe network resistance curve; Calculate the air volume deviation between the current air volume Q1 and the preset total air volume Qn; When the air volume deviation value is within a preset difference range, the current rotation speed V1 is used as the target rotation speed Vn.

9. The method for controlling the sewage collection equipment according to claim 8, wherein: After the step of calculating the air volume deviation value between the current air volume Q1 and the preset total air volume Qn, the method further includes: When the air volume deviation exceeds the preset difference range, the speed V2 is adjusted according to the similarity law, where V2 = V1*Qn / Q1; The adjusted speed V2 is used as the new current speed V1, and the process returns to the step of scaling the fan characteristic curve at the rated speed V0 to the fan characteristic curve at the current speed V1 according to the similarity law.

10. A sewage collection device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method for the sewage collection equipment according to any one of claims 1 to 9.

Images