A control system and control method for a fan

Abstract

The control system of the fan and the control method thereof provided by the present disclosure relate to the technical field of fans and comprise the following. The control system of the fan provided by the present disclosure comprises a first control valve and a control device. The first control valve is arranged in a first bypass pipeline. The control device is configured to acquire operating state information of the fan, determine whether the fan is in surge according to the operating state information of the fan, and control the first control valve when the fan is in surge. The control system controls the first bypass pipeline to assist the exhaust pipeline in exhausting air, thereby increasing the overall flow of the fan, allowing the flow of the fan to automatically recover to a normal value range, avoiding the problem of fan surge, and thereby achieving good protection for the fan.

Description

Technical Field

[0001] This disclosure relates to the field of wind turbine technology, and in particular to a control system and control method for a wind turbine. Background Technology

[0002] During the operation of a fan, surge is likely to occur when the flow rate decreases to a certain level. Surge is extremely destructive to a fan. In the current technology, the surge problem is usually solved by adjusting the fan flow rate. However, due to the complex operating conditions of the fan, it is difficult to adjust the fan flow rate to the normal value. If the flow rate adjustment is incorrect, it will further aggravate the surge of the fan. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail in this disclosure. This overview is not intended to limit the scope of the claims.

[0004] This disclosure provides a control system for a fan, wherein a first bypass pipe is provided on the outlet pipe of the fan, and the control system includes:

[0005] The first control valve is located in the first bypass pipeline;

[0006] The control device is configured to acquire the operating status information of the fan, determine whether the fan is experiencing surge based on the operating status information, and control the first control valve when the fan experiences surge.

[0007] In some embodiments of this disclosure, the operating status information includes surge frequency, and the control device is configured to determine that the fan is surging when the surge frequency is greater than a preset frequency.

[0008] In some embodiments of this disclosure, a second bypass pipe is provided on the air intake pipe of the fan, and the control system further includes:

[0009] The second control valve is located in the second bypass pipeline;

[0010] The control device is also configured to control the second control valve based on the operating status information of the fan.

[0011] In some embodiments of this disclosure, the operating status information of the fan includes the gas flow rate of the intake pipe, and the control device is used to control the second control valve to open or increase the opening degree of the second control valve when the gas flow rate is lower than the preset flow rate.

[0012] In some embodiments of this disclosure, the control system further includes:

[0013] The third control valve is located in the intake pipe;

[0014] The fourth control valve is located in the outlet pipeline;

[0015] The operating status information of the fan includes the on / off status of the fan. The control device is configured to control the first control valve and the second control valve to open and control the third control valve and the fourth control valve to close when the fan switches from the on state to the off state.

[0016] When the fan switches from the off state to the on state, the first control valve and the second control valve are closed, and the third control valve and the fourth control valve are opened.

[0017] In some embodiments of this disclosure, the control device is further configured to, in response to a power-on signal, acquire the on / off states of the second control valve, the third control valve, and the fourth control valve, and control the fan to start operation when the second control valve is in a closed state and the third control valve and the fourth control valve are in a fully open state.

[0018] In some embodiments of this disclosure, the air intake pipe is connected to an air supply device, and the control device is further configured to control the second control valve to open when the air supply device malfunctions.

[0019] In some embodiments of this disclosure, the air intake pipeline includes a first air intake section and a second air intake section connected together, the inlet of the second air intake section is connected to the outlet of the first air intake section, and the outlet of the second air intake section is connected to the fan.

[0020] The second control valve is located in the first intake section;

[0021] The second air intake section is equipped with a filter device, which is connected to a drainage device through a drain pipe;

[0022] The control system includes a liquid level detection device and a drain valve installed on the drainage equipment. The control device is configured to control the drain valve based on the liquid level information detected by the liquid level detection device.

[0023] In some embodiments of this disclosure, the fan is a magnetic levitation blower.

[0024] A second aspect of this disclosure provides a method for controlling a wind turbine, the method comprising:

[0025] Obtain the operating status information of the fan;

[0026] Determine whether the fan has experienced surge based on the fan's operating status information;

[0027] When the fan experiences surge, the first bypass pipe on the fan's outlet pipe is opened.

[0028] The control system and control method for the fan provided in this disclosure have the following beneficial effects:

[0029] By controlling the exhaust of the first bypass pipeline and auxiliary exhaust pipeline through the control system, the overall flow rate of the fan is increased, allowing the fan flow rate to automatically return to the normal range, thus avoiding the problem of fan surge and providing good protection for the fan. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of these embodiments. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present disclosure, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without inventive effort.

[0031] Figure 1 A structural diagram of a wind turbine control system shown as an exemplary embodiment of this disclosure;

[0032] Figure 2 A flowchart illustrating a fan control method as an exemplary embodiment of this disclosure.

[0033] In the picture:

[0034] 1. Fan; 2. Inlet pipe; 201. First inlet section; 202. Second inlet section; 3. Outlet pipe; 4. First bypass pipe; 5. First control valve; 6. Control device; 7. Second bypass pipe; 8. Second control valve; 9. Third control valve; 10. Fourth control valve; 11. Filtration equipment; 12. Drainage pipe; 13. Drainage equipment; 14. Liquid level detection device; 15. Drain valve; 16. First float switch; 17. Second float switch; 18. Manual valve; 19. Inlet valve. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions in the disclosed embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be arbitrarily combined with each other.

[0036] The outlet pipe of a fan typically uses a check valve. During fan operation, when the fan flow rate decreases to a certain level, the airflow cannot be discharged from the check valve, resulting in surge. Surge is extremely destructive to the fan. In current technology, the surge problem is usually solved by adjusting the fan flow rate. However, due to the complex operating conditions of the fan, it is difficult to adjust the fan flow rate to a normal value. If the flow rate adjustment is incorrect, it will further aggravate the surge.

[0037] To address the aforementioned technical problems, the exemplary embodiments of this disclosure provide a control system and control method for a fan. The control system controls the exhaust of the first bypass pipe to assist the exhaust pipe, thereby increasing the overall flow rate of the fan and allowing the fan flow rate to automatically return to the normal range, thus avoiding the problem of fan surge and providing good protection for the fan.

[0038] The control system and control method of the fan provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0039] An exemplary embodiment of this disclosure provides a control system for a wind turbine, such as... Figure 1 As shown, the above-mentioned fan 1 includes an air inlet pipe 2 and an air outlet pipe 3. A first bypass pipe 4 is provided on the air outlet pipe 3 of the fan 1. The control system includes a first control valve 5 and a control device 6. The first control valve 5 is provided on the first bypass pipe 4. The control device 6 is configured to acquire the operating status information of the fan 1, determine whether the fan 1 is experiencing surge based on the operating status information of the fan 1, and control the first control valve 5 when the fan 1 experiences surge.

[0040] In this embodiment, the operating status information of the fan 1 is obtained through the control device 6. When the flow rate of the fan 1 is less than the minimum flow rate for the fan 1 to surge, or when the fan 1 experiences a surge phenomenon, the control device 6 can control the first control valve 5 on the first bypass pipe 4 to open. The gas that cannot be discharged in the outlet pipe 3 is discharged through the first bypass pipe 4. In this way, the exhaust is assisted by the first bypass pipe 4 to increase the overall flow rate of the fan 1, so that the flow rate of the fan 1 can be restored to the normal value range by itself. This avoids the problem of the fan 1 surging caused by the gas stagnation inside the fan 1, thereby achieving a good protection effect for the fan 1.

[0041] In one embodiment, the operating status information includes surge frequency, and the control device 6 is configured to determine that the fan 1 is surging when the surge frequency is greater than a preset frequency.

[0042] In this embodiment, the control device 6 directly monitors the surge frequency of the fan 1 and adjusts the first control valve 5 according to the surge frequency of the fan 1. When the surge frequency is greater than the preset frequency, the control device 6 can control the first control valve 5 on the first bypass pipeline 4 to open, so as to adjust the flow rate of the fan 1. In this way, when the fan 1 has a surge problem, the internal flow rate of the fan 1 can be adjusted in time to avoid damage to the fan 1 due to surge.

[0043] A second bypass pipe 7 is provided on the air intake pipe 2 of the fan 1. In an exemplary embodiment of this disclosure, reference continues to be made to... Figure 1 The control system also includes a second control valve 8, which is located in a second bypass line 7. The second bypass line 7 can be used to provide temporary gas to the blower 1. The control device 6 is also configured to control the second control valve 8 according to the operating status information of the blower 1.

[0044] In this embodiment, when the air intake pipe 2 of the fan 1 is blocked or the device for supplying air to the air intake pipe 2 malfunctions, that is, when the air supply from the air intake pipe 2 to the fan 1 is insufficient, the second control valve 8 can be opened by the control device 6, and temporary gas (e.g., air) can be injected into the fan 1 through the second bypass pipe 7, thereby increasing the gas flow rate inside the fan 1, avoiding surge problems or other malfunctions caused by insufficient flow in the fan 1, and further ensuring the safety of the fan 1 during operation.

[0045] In one embodiment, the operating status information of the fan 1 includes the gas flow rate of the intake pipe 2. The control device 6 is used to control the second control valve 8 to open or increase the opening degree of the second control valve 8 when the gas flow rate is lower than the preset flow rate. The control device 6 can also be used to control the first control valve 5 to open when the gas flow rate is lower than the preset flow rate.

[0046] In this embodiment, when the control device 6 detects that the gas flow rate of the intake pipe 2 is too low and cannot meet the working requirements of the fan 1, the control device 6 can open the second control valve 8. The second control valve 8 allows the second bypass pipe 7 to provide temporary gas (e.g., air) to the intake pipe 2 for replenishment, so that the gas flow rate in the fan 1 can reach the normal value, avoiding the problem of the fan 1 surging or even stopping due to insufficient flow, thereby ensuring the normal operation and safety of the fan 1.

[0047] In an exemplary embodiment of this disclosure, reference continues to be made to... Figure 1The control system also includes a third control valve 9 and a fourth control valve 10. The third control valve 9 is located on the air inlet pipe 2, and the fourth control valve 10 is located on the air outlet pipe 3. The operating status information of the fan 1 includes the on / off status of the fan 1. The control device 6 is configured to control the first control valve 5 and the second control valve 8 to open and control the third control valve 9 and the fourth control valve 10 to close when the fan 1 switches from the open state to the closed state. When the fan 1 is closed, its rotor undergoes a slow deceleration process. When the third control valve 9 and the fourth control valve 10 are closed, temporary gas is supplied to the inside of the fan 1 through the second control valve 8 and this temporary gas is discharged through the first control valve 5 to provide a certain gas flow to the fan 1 to maintain the normal operation of the fan 1 and avoid the problem of insufficient gas flow during the shutdown process, which could cause the fan 1 to surge or be damaged.

[0048] When the fan 1 switches from the off state to the on state, the first control valve 5 and the second control valve 8 are closed, and the third control valve 9 and the fourth control valve 10 are opened. When the fan 1 is turned on, the third control valve 9 and the fourth control valve 10 control the air inlet pipe 2 and the air outlet pipe 3 of the fan 1 to be connected, and the air inlet pipe 2 provides the target gas to the fan 1. At the same time, the first control valve 5 and the second control valve 8 are closed to prevent the second bypass pipe 7 from injecting excessive gas into the fan 1 during operation, which would increase the load on the fan 1.

[0049] In this embodiment, the interlocking operation of the first control valve 5, the second control valve 8, the third control valve 9 and the fourth control valve 10 ensures the normal start and stop of the fan 1. At the same time, it can provide good protection for the fan 1 when problems such as surge occur, and ensure the operational safety of the fan 1.

[0050] In one embodiment, the control device 6 is further configured to, in response to a power-on signal, acquire the on / off states of the second control valve 8, the third control valve 9, and the fourth control valve 10, and control the fan 1 to start operation when the second control valve 8 is in the closed state and the third control valve 9 and the fourth control valve 10 are in the fully open state.

[0051] In this embodiment, before the fan 1 is started, the third control valve 9 and the fourth control valve 10 are fully open to ensure that the fan 1 will not surge due to insufficient air supply from the air intake pipe 2 during the period when the fan 1 starts to operate. By closing the second control valve 8, it is possible to avoid the second control valve 8 injecting temporary gas into the fan 1 during normal operation, thereby avoiding the problem of fan 1 overload and ensuring the safety of the fan 1 operation.

[0052] In one embodiment, the air intake pipe 2 is connected to an air supply device (not shown in the figure), and the control device 6 is further configured to control the second control valve 8 to open when the air supply device malfunctions.

[0053] In this embodiment, the second control valve 8 provides temporary gas to the air intake pipe 2, which can effectively prevent the air supply device from failing to supply gas normally, i.e., when the gas flow in the fan 1 is insufficient. This allows for timely adjustment of the internal flow of the fan 1 and prevents the fan 1 from experiencing surge or other malfunctions, thus providing good protection for the fan 1.

[0054] It is understandable that the first control valve 5, the second control valve 8, the third control valve 9, and the fourth control valve 10 can all be opened automatically by the control device 6, or they can be opened manually.

[0055] In one embodiment, the control system further includes an alarm device (not shown in the figure). The alarm device can be used to issue an alarm signal when the fan 1 experiences a surge problem. The alarm device can also be used to monitor the operating status of the first control valve 5, the second control valve 8, the third control valve 9, and the fourth control valve 10. When the first control valve 5, the second control valve 8, the third control valve 9, or the fourth control valve 10 is abnormally opened or closed, the control center can control the first control valve 5, the second control valve 8, the third control valve 9, or the fourth control valve 10 to stop operating, and the alarm device will issue an alarm signal so that the staff can carry out timely maintenance.

[0056] In one embodiment, reference continues to be made to Figure 1 The intake pipe 2 includes a first intake section 201 and a second intake section 202 connected together. The inlet of the second intake section 202 is connected to the outlet of the first intake section 201, and the outlet of the second intake section 202 is connected to the fan 1. A second control valve 8 is provided on the first intake section 201. A filter device 11 is provided on the second intake section 202. The filter device 11 is connected to the drainage device 13 through the drain pipe 12. The control system includes a liquid level detection device 14 and a drain valve 15 provided on the drainage device 13. The control device 6 is configured to control the drain valve 15 according to the liquid level information detected by the liquid level detection device 14.

[0057] In this embodiment, the first air intake section 201 is used to transmit the target gas provided by the gas supply device to the second air intake section 202. The filter device 11 located on the second air intake section 202 can filter impurities and moisture in the target gas to prevent moisture or impurities in the target gas from being transmitted to the fan 1, causing problems such as corrosion and damage to the fan 1. The filtrate produced by the filter device 11 is collected in the drainage device 13 through the drain pipe 12. By periodically treating the filtrate in the drainage device 13, the final removal of moisture and impurities in the target gas is achieved. Specifically, the liquid level height information of the filtrate in the drainage device 13 can be detected by the liquid level detection device 14 and sent to the control system. The control system determines whether the filtrate in the drainage device 13 needs to be centrally treated. When the liquid level height is higher than the preset height, the control center controls the drain valve 15 to open, and the filtrate is discharged from the drain valve 15 to achieve final removal.

[0058] In one embodiment, reference continues to be made to Figure 1 The drainage device 13 is equipped with a first float switch 16, a second float switch 17 and an air inlet valve 19. The first float switch 16 is located at the high liquid level threshold height of the drainage device 13, and the second float switch 17 is located at the low liquid level threshold height of the drainage device 13. A manual valve 18 is also provided at the bottom of the drainage device 13.

[0059] In this embodiment, the first float switch 16 and the second float switch 17 may have an alarm function. When the liquid level of the filtrate in the drainage device 13 is higher than the high liquid level threshold height, the first float switch 16 alarms. At this time, the manual valve 18 at the bottom of the drainage device 13 can be opened to avoid the problem of excessive liquid level and filtrate overflow in the drainage device 13 after the drainage valve 15 is damaged. When the liquid level of the filtrate in the drainage device 13 is lower than the low liquid level threshold height, the second float switch 17 alarms. At this time, it should be considered that the filter device 11 is damaged, and the filter element can be checked to see if it needs to be replaced. In addition, air can be supplied to the drainage device 13 and the filter device 11 connected to the drainage device 13 through the air inlet valve 19 so that the filtrate in the filter device 11 can be smoothly discharged into the drainage device 13.

[0060] Another exemplary embodiment of this disclosure provides a method for controlling a fan, such as... Figure 2 As shown, the main steps include:

[0061] Step S100: Obtain the operating status information of the wind turbine.

[0062] For example, the operating status information of the fan 1 may include the surge frequency of the fan 1, the gas flow rate of the intake pipe 2, and the on / off status of the fan 1.

[0063] Step S200: Determine whether the fan has experienced surge based on the fan's operating status information.

[0064] For example, whether the fan 1 is experiencing surge can be determined based on the gas flow rate of the intake pipe 2 and the surge frequency of the fan 1.

[0065] Step S300: When the fan experiences surge, open the first bypass pipe on the fan's outlet pipe.

[0066] In this embodiment, the exhaust pipe 3 can be assisted by the first bypass pipe 4 to increase the overall flow rate of the fan 1, so that the flow rate of the fan 1 can be restored to the normal range on its own, avoiding the problem of surge of the fan 1 caused by gas stagnation inside the fan 1, thereby achieving a good protection effect on the fan 1.

[0067] It is understandable that the fan 1 described above could be a magnetic levitation blower.

[0068] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0069] In the description of this specification, references to the terms "embodiment," "exemplary embodiment," "some implementation," "illustrated implementation," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with an implementation or example that are included in at least one implementation or example of this disclosure.

[0070] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same implementation or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementations or examples.

[0071] In the description of this disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0072] It is understood that the terms "first," "second," etc., as used in this disclosure may be used to describe various structures, but these structures are not limited by these terms. These terms are only used to distinguish one structure from another.

[0073] In one or more accompanying drawings, the same elements are represented by similar reference numerals. For clarity, many parts in the drawings are not drawn to scale. Furthermore, certain well-known parts may not be shown. For simplicity, a structure obtained after several steps may be depicted in a single drawing. Many specific details of this disclosure, such as the structure, materials, dimensions, processing methods, and techniques of the devices, are described below to provide a clearer understanding of the disclosure. However, as those skilled in the art will understand, this disclosure may be implemented without adhering to these specific details.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A control system for a fan, characterized in that, The blower (1) has a first bypass pipe (4) installed on its outlet pipe (3), and the control system includes: The first control valve (5) is installed in the first bypass pipeline (4); The control device (6) is configured to acquire the operating status information of the fan (1), determine whether the fan (1) is experiencing surge based on the operating status information of the fan (1), and control the first control valve (5) when the fan (1) experiences surge. The air intake pipe (2) of the fan (1) is provided with a second bypass pipe (7), and the control system further includes a second control valve (8) which is provided in the second bypass pipe (7); The control device (6) is also configured to control the second control valve (8) according to the operating status information of the fan (1); The control system further includes: The third control valve (9) is installed in the air intake pipe (2); The fourth control valve (10) is installed in the air outlet pipe (3); The operating status information of the fan (1) includes the on / off status of the fan (1). The control device (6) is configured to control the first control valve (5) and the second control valve (8) to open and control the third control valve (9) and the fourth control valve (10) to close when the fan (1) switches from the open state to the closed state. When the fan (1) switches from the closed state to the open state, the first control valve (5) and the second control valve (8) are closed, and the third control valve (9) and the fourth control valve (10) are opened. The control device (6) is further configured to, in response to a power-on signal, acquire the on / off states of the second control valve (8), the third control valve (9), and the fourth control valve (10), and control the fan (1) to start operation when the second control valve (8) is in the closed state and the third control valve (9) and the fourth control valve (10) are in the fully open state.

2. The control system for the fan according to claim 1, characterized in that, The operating status information includes surge frequency, and the control device (6) is configured to determine that the fan (1) is surging when the surge frequency is greater than a preset frequency.

3. The control system for the fan according to claim 1, characterized in that, The operating status information of the fan (1) includes the gas flow rate of the air inlet pipe (2). The control device (6) is used to control the second control valve (8) to open or increase the opening degree of the second control valve (8) when the gas flow rate is lower than the preset flow rate.

4. The control system for the fan according to claim 1, characterized in that, The air intake pipe (2) is connected to the air supply device, and the control device (6) is also configured to control the second control valve (8) to open when the air supply device malfunctions.

5. The control system for the fan according to any one of claims 3 to 4, characterized in that, The air intake pipe (2) includes a first air intake section (201) and a second air intake section (202) connected together. The inlet of the second air intake section (202) is connected to the outlet of the first air intake section (201), and the outlet of the second air intake section (202) is connected to the fan (1). The second control valve (8) is located in the first air intake section (201); The second air intake section (202) is equipped with a filter device (11), which is connected to a drainage device (13) through a drain pipe (12); The control system includes a liquid level detection device (14) and a drain valve (15) disposed on the drainage device (13), and the control device (6) is configured to control the drain valve (15) according to the liquid level information detected by the liquid level detection device (14).

6. The control system for the fan according to any one of claims 3 to 4, characterized in that, The blower (1) is a magnetic levitation blower.

7. A method for controlling a wind turbine, applied to a wind turbine control system as described in any one of claims 1 to 6, characterized in that, The control method for the fan includes: Obtain the operating status information of the fan; Determine whether the fan has experienced surge based on the fan's operating status information; When the fan experiences surge, the first bypass pipe on the fan's outlet pipe is opened.

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