Fan tower bottom heat dissipation circuit and system

Abstract

The utility model provides a fan tower bottom heat dissipation circuit and system, and relates to the fan tower bottom cooling technology field, the fan tower bottom heat dissipation circuit comprises a three-phase power supply, a positive and negative rotation execution module, a control module and a heat dissipation fan, a positive rotation contactor and a negative rotation contactor are connected to the three-phase power supply in different phase sequences, so that the heat dissipation fan can switch the rotation direction according to needs, and the heat dissipation efficiency is improved. The airflow direction is changed; the control module is based on logic cooperation among the time and temperature control unit, the first humidity control unit and the second humidity control unit, a multi-factor collaborative judgment mechanism such as time, temperature and humidity is effectively combined, the response capacity to complex environment changes is improved, the cooling fan rotates forwards under the high-temperature and low-humidity condition, hot air is rapidly exhausted, and the cooling efficiency is improved. Equipment can work stably, and can rotate reversely under high-temperature and high-humidity conditions, so that moisture accumulation in the tower bottom is reduced, and the risk that electrical equipment is affected with damp is reduced; the cooling fan is controlled to be started in the preset operation time period, and the service life of the cooling fan is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine tower bottom cooling technology, and in particular to a wind turbine tower bottom heat dissipation circuit and system. Background Technology

[0002] In wind power equipment and other tower-type equipment, the base of the wind turbine tower is the core area of ​​the electrical and control systems, and its internal ambient temperature is crucial for maintaining stable operation. Currently, heat dissipation at the base of the tower mainly relies on natural ventilation through two ventilation holes in the structure. However, this natural ventilation method is insufficient to meet the demand for efficient heat dissipation, especially under high-temperature or high-load operating conditions. Therefore, the cabinet is equipped with a built-in cooling fan to assist in the heat dissipation process. The cooling fan accelerates the transfer of hot air from the inside of the cabinet to the outside through forced convection, thereby improving heat dissipation efficiency.

[0003] In existing technologies, cooling fans cannot flexibly adjust the air supply or exhaust direction according to changes in temperature and humidity. This can easily lead to internal condensation in high humidity environments, affecting the safe operation of electrical equipment. Meanwhile, in low humidity environments, the dry air may exacerbate static electricity accumulation, posing potential risks. It is impossible to comprehensively consider multiple environmental factors to achieve refined and intelligent heat dissipation management. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a heat dissipation circuit and system for the bottom of a wind turbine tower, which solves the technical problems of the existing technology where the cooling fan installed at the bottom of the wind turbine tower cannot flexibly adjust the airflow direction and cannot comprehensively consider various environmental factors to achieve refined and intelligent heat dissipation management.

[0005] This utility model provides a heat dissipation circuit for the bottom of a wind turbine tower, including a three-phase power supply, a forward and reverse rotation execution module, a control module, and a cooling fan;

[0006] The forward and reverse execution module includes a forward contactor and a reverse contactor. The main contacts of the forward contactor and the main contacts of the reverse contactor are respectively connected to the three-phase power supply and connected to the cooling fan in different phase sequences.

[0007] The control module is connected between the three-phase power supply and the forward and reverse rotation execution module, and is used to generate control signals according to environmental parameters to drive the forward and reverse rotation execution module to operate. The control module includes a time and temperature control unit, a first humidity control unit and a second humidity control unit, and the first humidity control unit and the second humidity control unit are connected in parallel to the output terminal of the time and temperature control unit.

[0008] When the current time is within a preset operating period and the ambient temperature is higher than a preset temperature, causing the time and temperature control unit to be activated:

[0009] When the ambient humidity is lower than or equal to the preset humidity, the forward contactor closes and the reverse contactor opens to control the cooling fan to rotate forward;

[0010] When the ambient humidity is higher than the preset humidity, the forward contactor is triggered to open and the reverse contactor is triggered to close, so as to control the cooling fan to reverse.

[0011] Optionally, the U phase of the three-phase power supply is connected to the U terminal of the cooling fan through the first main contact of the forward contactor, the V phase of the three-phase power supply is connected to the V terminal of the cooling fan through the second main contact of the forward contactor, and the W phase of the three-phase power supply is connected to the W terminal of the cooling fan through the third main contact of the forward contactor. When the main contact of the forward contactor is closed, the cooling fan operates in the forward direction based on the UVW phase sequence to achieve forward rotation. Alternatively, the U phase of the three-phase power supply is connected to the V terminal of the cooling fan through the third main contact of the reverse contactor, the V phase of the three-phase power supply is connected to the U terminal of the cooling fan through the second main contact of the reverse contactor, and the W phase of the three-phase power supply is connected to the W terminal of the cooling fan through the first main contact of the reverse contactor. When the main contact of the reverse contactor is closed, the cooling fan operates in the reverse direction based on the WUV phase sequence to achieve reverse rotation.

[0012] Optionally, the heat dissipation circuit at the bottom of the wind turbine tower further includes a main circuit breaker, a first fuse, and a first thermal relay; the three-phase power supply is connected to the cooling fan in sequence through the main circuit breaker, the first fuse, the forward and reverse execution module, and the first thermal relay.

[0013] Optionally, the time and temperature control unit includes an automatic control branch, a manual control branch, and a switch; the automatic control branch includes a time controller, a temperature controller, and an automatic control indicator light connected in sequence; the manual control branch includes a manual control indicator light and a coil of a control contactor connected in sequence; the fixed end of the switch is connected to the first humidity control unit and the second humidity control unit respectively, and the free end of the switch is connected to the automatic control branch or the manual control branch.

[0014] Optionally, the time and temperature control unit further includes a second fuse, a second thermal relay, and a stop switch; the V phase of the three-phase power supply is connected to the first terminal of the second fuse, and the second terminal of the second fuse is connected to the input terminal of the automatic control branch and the input terminal of the manual control branch respectively through the second thermal relay; one end of the stop switch is connected to the switching switch, and the other end of the stop switch is connected to the first humidity control unit and the second humidity control unit respectively, wherein the stop switch is normally closed.

[0015] Optionally, the first humidity control unit includes a first humidity control circuit, a first interlock circuit, and a forward rotation indicator light connected in sequence; the second humidity control unit includes a second humidity control circuit, a second interlock circuit, and a reverse rotation indicator light connected in sequence.

[0016] Optionally, the first humidity control circuit includes a first humidity manual control branch and a first humidity automatic control branch connected in parallel. The first humidity manual control branch includes a forward manual control button, and the first humidity automatic control branch includes a forward automatic control button, a first humidity controller, and an auxiliary contact of a control contactor connected in sequence. The first interlock circuit includes the coil of the forward contactor and the auxiliary contact of the reverse contactor connected in sequence, wherein the auxiliary contact of the reverse contactor is normally closed.

[0017] Optionally, the second humidity control circuit includes a second humidity manual control branch and a second humidity automatic control branch connected in parallel. The second humidity manual control branch includes a reverse manual control button, and the second humidity automatic control branch includes a reverse automatic control button, a second humidity controller, and an auxiliary contact of a control contactor connected in sequence. The second interlock circuit includes the coil of the reverse contactor and the auxiliary contact of the forward contactor connected in sequence, wherein the auxiliary contact of the forward contactor is normally closed.

[0018] Optionally, the control module further includes a third fuse; the V phase of the three-phase power supply is connected to the input terminal of the time and temperature control unit, the output terminal of the time and temperature control unit is connected to the input terminals of the first humidity control unit and the second humidity control unit respectively, the output terminals of the first humidity control unit and the second humidity control unit are connected to the first terminal of the third fuse respectively, and the second terminal of the third fuse is connected to the forward and reverse execution module.

[0019] Another aspect of this utility model provides a wind turbine tower bottom heat dissipation system, including the wind turbine tower bottom heat dissipation circuit and the wind turbine as described in any of the above claims; the wind turbine tower bottom heat dissipation circuit is disposed at the bottom of the wind turbine tower.

[0020] The wind turbine tower bottom heat dissipation circuit and system provided by this utility model connects the forward and reverse contactors to a three-phase power supply with different phase sequences, enabling the cooling fan to switch rotation directions as needed, thereby changing the airflow direction. The control module, based on the logical coordination between the time and temperature control unit, the first humidity control unit, and the second humidity control unit, effectively combines a multi-factor collaborative judgment mechanism of time, temperature, and humidity, avoiding the limitations of single-parameter control and improving the responsiveness to complex environmental changes. Specifically, maintaining the cooling fan in forward rotation under high temperature and low humidity conditions helps to quickly expel hot air and ensure stable equipment operation, while switching the cooling fan to reverse rotation under high temperature and high humidity conditions helps to reduce moisture accumulation inside the tower bottom and reduce the risk of electrical equipment getting damp. Furthermore, controlling the cooling fan to operate within a preset operating period helps to extend the service life of the cooling fan.

[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the heat dissipation circuit at the bottom of the wind turbine tower in one embodiment of this application;

[0025] Figure 2 A schematic diagram of the specific circuit structure of the heat dissipation circuit at the bottom of the wind turbine tower is provided in one embodiment of this application.

[0026] In the picture:

[0027] U, the U phase of a three-phase power supply; V, the V phase of a three-phase power supply; W, the W phase of a three-phase power supply;

[0028] KM1, coil of the forward contactor; KM1-M, main contacts of the forward contactor; KM1-NC, auxiliary contacts of the forward contactor;

[0029] KM2, coil of the reverse contactor; KM2-M, main contacts of the reverse contactor; KM2-NC, auxiliary contacts of the reverse contactor;

[0030] KM3 is the coil of the control contactor; KM3-NC is the auxiliary contact of the reverse contactor.

[0031] Q1, main circuit breaker; FU1, first fuse; FU2, second fuse; FU3, third fuse; FR1, first thermal relay; FR2, second thermal relay;

[0032] M, cooling fan; U1, U-end of cooling fan; V1, V-end of cooling fan; W1, W-end of cooling fan;

[0033] L1, Automatic control indicator; L2, Manual control indicator; L3, Forward rotation indicator; L4, Reverse rotation indicator;

[0034] KT1, Time Controller; S1, Temperature Controller; S2, Switch; S3, Stop Switch; S4, Forward Manual Control Button; S5, Forward Automatic Control Button; S6, First Humidity Controller; S7, Reverse Manual Control Button; S8, Reverse Automatic Control Button; S9, Second Humidity Controller. Detailed Implementation

[0035] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0036] In one embodiment, such as Figure 1 and Figure 2 As shown, a heat dissipation circuit for the bottom of a wind turbine tower is provided, including a three-phase power supply, a forward / reverse rotation execution module, a control module, and a cooling fan M. The forward / reverse rotation execution module includes a forward contactor and a reverse contactor. The main contacts KM1-M of the forward contactor and the main contacts KM2-M of the reverse contactor are respectively connected to the three-phase power supply and connected to the cooling fan M in different phase sequences. The control module is connected between the three-phase power supply and the forward / reverse rotation execution module, and is used to generate control signals according to environmental parameters to drive the forward / reverse rotation execution module to operate. The control module includes a time and temperature control unit, a first humidity control unit, and a second humidity control unit. The first humidity control unit and the second humidity control unit are connected in parallel to the output terminal of the time and temperature control unit. When the current time is within a preset operating period and the ambient temperature is higher than a preset temperature, causing the time and temperature control unit to be turned on: when the ambient humidity is lower than or equal to the preset humidity, the forward contactor closes and the reverse contactor opens to control the cooling fan M to rotate forward; when the ambient humidity is higher than the preset humidity, the forward contactor is triggered to open and the reverse contactor is triggered to close to control the cooling fan M to rotate in reverse.

[0037] The cooling circuit at the bottom of the wind turbine tower provided in this embodiment connects the forward and reverse contactors to the three-phase power supply in different phase sequences, enabling the cooling fan M to switch its rotation direction as needed, thereby changing the airflow direction. The control module, based on the logical coordination between the time and temperature control unit, the first humidity control unit, and the second humidity control unit, effectively combines a multi-factor collaborative judgment mechanism involving time, temperature, and humidity, avoiding the limitations of single-parameter control and improving the responsiveness to complex environmental changes. Specifically, maintaining the forward rotation of the cooling fan M under high temperature and low humidity conditions helps to quickly expel hot air and ensure stable equipment operation, while switching the cooling fan M to reverse operation under high temperature and high humidity conditions helps to reduce moisture accumulation inside the tower bottom and reduce the risk of electrical equipment getting damp. Furthermore, controlling the cooling fan M to be turned on within a preset operating period helps to extend the service life of the cooling fan M.

[0038] In one embodiment, such as Figure 2 As shown, the U phase of the three-phase power supply is connected to the U terminal of the cooling fan M through the first main contact of the forward contactor; the V phase of the three-phase power supply is connected to the V terminal of the cooling fan M through the second main contact of the forward contactor; and the W phase of the three-phase power supply is connected to the W terminal of the cooling fan M through the third main contact of the forward contactor. When the main contacts KM1-M of the forward contactor are closed, the cooling fan M rotates forward based on the UVW phase sequence. The U phase of the three-phase power supply is connected to the V terminal of the cooling fan M through the third main contact of the reverse contactor; the V phase of the three-phase power supply is connected to the U terminal of the cooling fan M through the second main contact of the reverse contactor; and the W phase of the three-phase power supply is connected to the W terminal of the cooling fan M through the first main contact of the reverse contactor. When the main contacts KM2-M of the reverse contactor are closed, the cooling fan M rotates in reverse based on the WUV phase sequence.

[0039] Furthermore, the heat dissipation circuit at the bottom of the wind turbine tower also includes a main circuit breaker Q1, a first fuse FU1, and a first thermal relay FR1; the three-phase power supply is connected to the cooling fan M in sequence through the main circuit breaker Q1, the first fuse FU1, the forward and reverse execution module, and the first thermal relay FR1.

[0040] Specifically, the three-phase power input serves as the power source for the entire circuit, connecting to subsequent circuits via the main circuit breaker Q1 and the first fuse FU1. The main circuit breaker Q1, located at the three-phase power input, automatically cuts off the power supply in case of overload or short circuit, protecting the entire circuit from damage and facilitating maintenance and emergency operation. The first fuse FU1, located after the main circuit breaker Q1, melts when the current in the circuit exceeds its rated value, thus cutting off the circuit and preventing equipment damage due to overcurrent. The main contacts KM1-M of the forward contactor have… Three contacts are connected to the U, V, and W phases of the three-phase power supply and the U1, V1, and W1 terminals of the cooling fan M, respectively. The main contacts KM2-M of the reversing contactor are connected differently from those of the forward contactor to achieve reversal by changing the phase sequence. The first thermal relay FR1 is used to protect the cooling fan M from overload. When the cooling fan M operates under overload for a long time and the temperature rises, the first thermal relay FR1 will cut off the power supply to prevent the cooling fan M from burning out. The cooling fan M, as the actuator, rotates forward or backward according to the control of the forward and reversing contactors to complete the heat dissipation task.

[0041] The three-phase power supply controls the cooling fan M to achieve forward and reverse rotation via forward and reverse contactors. During forward control of the cooling fan M, when the coil KM1 of the forward contactor is energized, the main contact KM1-M of the forward contactor closes. Based on the connection between the main contact KM1-M of the forward contactor and the terminals of the cooling fan M, the cooling fan M rotates forward based on the UVW phase sequence. At this time, the main contact KM2-M of the reverse contactor is open to avoid a short circuit. Conversely, when the coil KM2 of the reverse contactor is energized, the main contact KM2-M of the reverse contactor closes. Based on the connection between the main contact KM2-M of the reverse contactor and the terminals of the cooling fan M, the cooling fan M rotates in reverse based on the WUV phase sequence. At this time, the main contact KM1-M of the forward contactor is open to avoid a short circuit.

[0042] In this embodiment, the rotation direction of the cooling fan M can be flexibly changed by switching between the forward and reverse contactors, thereby adjusting the airflow direction. This enables more effective heat dissipation and ventilation, avoids mechanical wear caused by prolonged unidirectional operation, and extends the service life of the cooling fan M and its related components. The first thermal relay FR1 provides overload protection for the cooling fan M, ensuring timely power cut-off in abnormal situations to prevent equipment damage and enhance the reliability and safety of the circuit.

[0043] In one embodiment, such as Figure 2As shown, the time and temperature control unit includes an automatic control branch, a manual control branch, and a switch S2; the automatic control branch includes a time controller KT1, a temperature controller S1, and an automatic control indicator L1 connected in sequence; the manual control branch includes a manual control indicator L2 connected in sequence and a control contactor coil KM3; the fixed end of the switch S2 is connected to the first humidity control unit and the second humidity control unit respectively, and the free end of the switch S2 is connected to either the automatic control branch or the manual control branch.

[0044] Furthermore, the time and temperature control unit also includes a second fuse FU2, a second thermal relay FR2, and a stop switch S3; the V phase of the three-phase power supply is connected to the first terminal of the second fuse FU2, and the second terminal of the second fuse FU2 is connected to the input terminal of the automatic control branch and the input terminal of the manual control branch through the second thermal relay FR2 respectively; one end of the stop switch S3 is connected to the switching switch S2, and the other end of the stop switch S3 is connected to the first humidity control unit and the second humidity control unit respectively, wherein the stop switch S3 is normally closed.

[0045] Specifically, the second fuse FU2 protects the entire circuit from overcurrent damage; the second thermal relay FR2 is connected after the second fuse FU2 to provide overload protection for other circuit components, preventing equipment damage due to prolonged overload operation; the time controller KT1 is set to close from 12:00 to 18:00 daily to automatically start the equipment during specific time periods; the temperature controller S1 closes when the ambient temperature exceeds 40℃ to automatically start the equipment for cooling under high-temperature conditions; the automatic control indicator L1 is located on the automatic control branch, and illuminates when both the time controller KT1 and the temperature controller S1 are closed, indicating that the automatic control branch is in operation and the time and temperature control units are in automatic control mode; the manual control indicator L2 is located on the manual control branch, and illuminates when the coil KM3 of the manual control contactor is turned on, indicating that the manual control branch is in operation and the time and temperature control units are in manual control mode; the toggle switch S2 is used to select between manual and automatic control modes; and the stop switch S3 is used to cut off the circuit in emergencies to ensure safety.

[0046] When the free end of the switch S2 is connected to the automatic control branch, the time and temperature control unit is in automatic control mode. That is, when the time controller KT1 closes within the set time period (12:00-18:00) and the temperature controller S1 detects that the ambient temperature exceeds 40℃, the automatic control indicator L1 lights up to make the cooling fan M run. When the free end of the switch S2 is connected to the manual control branch, the time and temperature control unit is in manual control mode. The coil KM3 of the manual control contactor is energized, and the manual control indicator lights up to make the cooling fan M run. In any mode, pressing the disconnect stop switch S3 de-energizes the circuit and the cooling fan M stops running.

[0047] In this embodiment, the intelligent control of the equipment is realized by combining the time controller KT1 and the temperature controller S1. It can automatically start or stop according to time and temperature conditions, which improves the automation level of the circuit. The safe operation of the circuit is ensured and the risk of failure is reduced by protection devices such as the second fuse FU2 and the second thermal relay FR2. Both manual and automatic control modes are provided, which users can flexibly choose according to actual needs, enhancing the applicability and ease of operation of the system.

[0048] In one embodiment, the first humidity control unit includes a first humidity control circuit, a first interlock circuit, and a forward indicator light L3 connected in sequence; the second humidity control unit includes a second humidity control circuit, a second interlock circuit, and a reverse indicator light L4 connected in sequence.

[0049] Furthermore, the first humidity control circuit includes a first humidity manual control branch and a first humidity automatic control branch connected in parallel. The first humidity manual control branch includes a forward manual control button S4, and the first humidity automatic control branch includes a forward automatic control button S5, a first humidity controller S6, and an auxiliary contact KM3-NC of a control contactor connected in sequence. The first interlock circuit includes a coil KM1 of a forward contactor and an auxiliary contact KM2-NC of a reverse contactor connected in parallel, wherein the auxiliary contact KM2-NC of the reverse contactor is normally closed.

[0050] In one embodiment, the second humidity control circuit includes a second humidity manual control branch and a second humidity automatic control branch connected in parallel. The second humidity manual control branch includes a reverse manual control button S7, and the second humidity automatic control branch includes a reverse automatic control button S8, a second humidity controller S9, and an auxiliary contact KM3-NC of a control contactor connected in sequence. The second interlock circuit includes a coil KM2 of a reverse contactor and an auxiliary contact KM1-NC of a forward contactor connected in parallel, wherein the auxiliary contact KM1-NC of the forward contactor is normally closed.

[0051] In one embodiment, the control module further includes a third fuse FU3; the V phase of the three-phase power supply is connected to the input terminal of the time and temperature control unit, the output terminal of the time and temperature control unit is connected to the input terminal of the first humidity control unit and the input terminal of the second humidity control unit respectively, the output terminal of the first humidity control unit and the output terminal of the second humidity control unit are connected to the first terminal of the third fuse FU3 respectively, and the second terminal of the third fuse FU3 is connected to the forward and reverse execution module.

[0052] Specifically, both the first and second humidity control circuits have manual and automatic control modes. The automatic control mode is based on the humidity controller detecting the ambient humidity. When the first humidity control circuit detects that the ambient humidity is less than or equal to 50%, the first humidity controller S6 closes and the second humidity controller S9 opens, the first humidity control circuit is turned on and the second humidity control circuit is turned off. At this time, the coil KM1 of the forward contactor is turned on, and the main contact KM1-M of the forward contactor in the forward and reverse execution module closes, controlling the cooling fan M to rotate forward, and the forward indicator light L3 lights up. When the second humidity control circuit detects that the ambient humidity is greater than 50%, the second humidity controller S9 closes and the first humidity controller S6 opens, the second humidity control circuit is turned on and the first humidity control circuit is turned off. At this time, the coil KM2 of the reverse contactor is turned on, and the main contact KM2-M of the reverse contactor in the forward and reverse execution module closes, controlling the cooling fan M to rotate in reverse, and the reverse indicator light L4 lights up.

[0053] In the two interlocking circuits, the auxiliary contact KM1-NC of the forward contactor is connected to the coil KM2 of the reverse contactor, and the auxiliary contact KM2-NC of the reverse contactor is connected to the coil KM1 of the forward contactor, thus achieving electrical interlocking. When the coil KM1 of the forward contactor is energized, the circuit of the reverse contactor is disconnected to prevent the reverse contactor from starting at the same time. Similarly, the reverse contactor ensures that the forward and reverse rotation of the cooling fan M will not run at the same time.

[0054] In this embodiment, both manual and automatic control modes are provided, which can be flexibly selected according to actual needs, enhancing the applicability and ease of operation of the system. Combined with a humidity controller, the equipment can automatically start or stop according to the ambient humidity conditions, improving the system's intelligence level and operating efficiency. An interlock circuit is set to ensure that only one operation can be performed at a time, namely forward or reverse rotation, avoiding mechanical damage and safety accidents caused by simultaneous forward and reverse rotation of the equipment. Forward indicator L3 and reverse indicator L4 are used to display the current status of the equipment, facilitating real-time monitoring and operation by the user.

[0055] In another embodiment, a wind turbine tower bottom heat dissipation system is provided, including a wind turbine tower bottom heat dissipation circuit as described in any of the above embodiments and a wind turbine; the wind turbine tower bottom heat dissipation circuit is disposed at the bottom of the wind turbine tower.

[0056] In this embodiment, the heat dissipation circuit is directly arranged at the bottom of the tower, which can quickly respond to the environmental parameters at the bottom of the tower, realize real-time monitoring and heat dissipation control of the temperature and humidity changes inside the fan. Specifically, considering that the bottom of the fan tower is usually a critical area for heat accumulation and a large number of electrical control components are concentrated there, placing the control circuit of the cooling fan M at the bottom of the tower can accurately control the fan's start, stop and direction, effectively guide the cold air in and the hot air out, form a reasonable airflow path, improve the overall heat dissipation efficiency, and the heat dissipation circuit based on the coordinated control of multiple parameters such as time, temperature and humidity can avoid equipment failure caused by high temperature and high humidity, significantly improve the working stability of electrical components, and extend their service life.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A heat dissipation circuit for the base of a wind turbine tower, characterized in that, It includes a three-phase power supply, a forward / reverse rotation execution module, a control module, and a cooling fan; The forward and reverse execution module includes a forward contactor and a reverse contactor. The main contacts of the forward contactor and the main contacts of the reverse contactor are respectively connected to the three-phase power supply and connected to the cooling fan in different phase sequences. The control module is connected between the three-phase power supply and the forward and reverse rotation execution module, and is used to generate control signals according to environmental parameters to drive the forward and reverse rotation execution module to operate. The control module includes a time and temperature control unit, a first humidity control unit and a second humidity control unit, and the first humidity control unit and the second humidity control unit are connected in parallel to the output terminal of the time and temperature control unit. When the current time is within a preset operating period and the ambient temperature is higher than a preset temperature, causing the time and temperature control unit to be activated: When the ambient humidity is lower than or equal to the preset humidity, the forward contactor closes and the reverse contactor opens to control the cooling fan to rotate forward; When the ambient humidity is higher than the preset humidity, the forward contactor is triggered to open and the reverse contactor is triggered to close, so as to control the cooling fan to reverse.

2. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 1, characterized in that, The U phase of the three-phase power supply is connected to the U terminal of the cooling fan through the first main contact of the forward rotation contactor, the V phase of the three-phase power supply is connected to the V terminal of the cooling fan through the second main contact of the forward rotation contactor, and the W phase of the three-phase power supply is connected to the W terminal of the cooling fan through the third main contact of the forward rotation contactor. When the main contact of the forward rotation contactor is closed, the cooling fan rotates forward based on the phase sequence of UVW. The U phase of the three-phase power supply is connected to the V terminal of the cooling fan through the third main contact of the reversing contactor, the V phase of the three-phase power supply is connected to the U terminal of the cooling fan through the second main contact of the reversing contactor, and the W phase of the three-phase power supply is connected to the W terminal of the cooling fan through the first main contact of the reversing contactor. When the main contact of the reversing contactor is closed, the cooling fan reverses its operation based on the WUV phase sequence.

3. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 1 or 2, characterized in that, The heat dissipation circuit at the bottom of the wind turbine tower also includes a main circuit breaker, a first fuse, and a first thermal relay; The three-phase power supply is connected to the cooling fan in sequence through the main circuit breaker, the first fuse, the forward and reverse execution module, and the first thermal relay.

4. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 1, characterized in that, The time and temperature control unit includes an automatic control branch, a manual control branch, and a switch; The automatic control branch includes a time controller, a temperature controller, and an automatic control indicator light connected in sequence. The manual control branch includes a connected manual control indicator light and a coil for a control contactor; The fixed end of the switch is connected to the first humidity control unit and the second humidity control unit, respectively, and the free end of the switch is connected to the automatic control branch or the manual control branch.

5. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 4, characterized in that, The time and temperature control unit also includes a second fuse, a second thermal relay, and a stop switch; The V phase of the three-phase power supply is connected to the first terminal of the second fuse, and the second terminal of the second fuse is connected to the input terminal of the automatic control branch and the input terminal of the manual control branch respectively through the second thermal relay. One end of the stop switch is connected to the switching switch, and the other end of the stop switch is connected to the first humidity control unit and the second humidity control unit respectively, wherein the stop switch is normally closed.

6. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 1, characterized in that, The first humidity control unit includes a first humidity control circuit, a first interlock circuit, and a forward rotation indicator light connected in sequence. The second humidity control unit includes a second humidity control circuit, a second interlock circuit, and a reverse indicator light connected in sequence.

7. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 6, characterized in that, The first humidity control circuit includes a first humidity manual control branch and a first humidity automatic control branch connected in parallel. The first humidity manual control branch includes a forward manual control button, and the first humidity automatic control branch includes a forward automatic control button, a first humidity controller, and auxiliary contacts of a control contactor connected in sequence. The first interlock circuit includes the coil of the forward contactor and the auxiliary contact of the reverse contactor connected together, wherein the auxiliary contact of the reverse contactor is normally closed.

8. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 6, characterized in that, The second humidity control circuit includes a second humidity manual control branch and a second humidity automatic control branch connected in parallel. The second humidity manual control branch includes a reverse manual control button, and the second humidity automatic control branch includes a reverse automatic control button, a second humidity controller, and auxiliary contacts of a control contactor connected in sequence. The second interlock circuit includes the coil of the reverse contactor and the auxiliary contact of the forward contactor connected together, wherein the auxiliary contact of the forward contactor is normally closed.

9. The heat dissipation circuit at the bottom of the wind turbine tower according to claim 1, characterized in that, The control module also includes a third fuse; The V phase of the three-phase power supply is connected to the input terminal of the time and temperature control unit. The output terminal of the time and temperature control unit is connected to the input terminals of the first humidity control unit and the second humidity control unit, respectively. The output terminals of the first humidity control unit and the second humidity control unit are connected to the first terminal of the third fuse, respectively. The second terminal of the third fuse is connected to the forward and reverse execution module.

10. A heat dissipation system at the base of a wind turbine tower, characterized in that, Includes the heat dissipation circuit at the bottom of the wind turbine tower and the wind turbine as described in any one of claims 1 to 9; The heat dissipation circuit at the bottom of the wind turbine tower is located at the bottom of the wind turbine tower.

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