Variable-diameter speed regulation fan, cooling system, control method and engineering machinery

Abstract

The invention provides a variable-diameter speed regulation fan, a cooling system, a control method and engineering machinery, and relates to the technical field of engineering machinery. The variable-diameter speed regulation fan comprises a fan blade assembly, a piston rod assembly, a base and a rotary coupler, the fan blade assembly is connected with a piston rod in the piston rod assembly in a screwed mode, and the fan blade assembly comprises variable-diameter fan blades; the piston rod assembly is arranged in the base, and the piston rod assembly is telescopic; the base is fixedly connected with the rotating coupler, a first oil liquid channel is formed in the base, and the first oil liquid channel communicates with the piston rod assembly and the rotating coupler; the rotating coupler is connected with the heat dissipation motor, a second oil liquid channel is arranged in the rotating coupler, and the first oil liquid channel communicates with the second oil liquid channel. The fan can perform dual adjustment of the rotating speed and the fan blade diameter, so that the wide adjustment range of the air volume is achieved, and different use scenes are met.

Description

Technical Field

[0001] The present application relates to the technical field of construction machinery, and in particular, to a variable-diameter speed-regulating fan, a heat dissipation system, a control method, and construction machinery. Background Art

[0002] At present, construction machinery mainly adopts liquid circulation air-cooling technology, using coolant or hydraulic oil to dissipate heat through a fan and a radiator in a circulation system, reducing the temperature of the engine and the hydraulic oil. The cooling system of construction machinery mainly consists of equipment such as pumps, radiators, fans, and temperature sensors.

[0003] In construction machinery, the fan blades generally have a fixed radial length, and the air volume adjustment mainly depends on the speed adjustment. The main body of the fan blade is usually made of nylon, and the skeleton is a metal insert for connecting with the heat dissipation motor. The heat dissipation amount is adjusted by adjusting the fan speed.

[0004] However, the speed adjustment range is small, and large-span air volume adjustment cannot be achieved, making it difficult to meet different usage scenarios. Summary of the Invention

[0005] The variable-diameter speed-regulating fan, heat dissipation system, control method, and construction machinery provided by the embodiments of the present application are used to achieve large-span air volume adjustment, so as to meet the effects of different usage scenarios.

[0006] In a first aspect, an embodiment of the present application provides a variable-diameter speed-regulating fan, including: a fan blade assembly, a piston rod assembly, a base, and a rotary coupling, wherein:

[0007] The fan blade assembly is screwed and connected to the piston rod in the piston rod assembly, and the fan blade assembly includes variable-diameter fan blades;

[0008] The piston rod assembly is arranged inside the base, and the piston rod assembly is telescopic;

[0009] The base is fixedly connected to the rotary coupling, and a first hydraulic oil passage is provided inside the base, and the first hydraulic oil passage communicates with the piston rod assembly and the rotary coupling;

[0010] The rotary coupling is connected to the heat dissipation motor, and a second hydraulic oil passage is provided inside the rotary coupling, and the first hydraulic oil passage communicates with the second hydraulic oil passage.

[0011] Optionally, a cylinder barrel is provided in the base, the number of cylinder barrels is the same as the number of variable-diameter fan blades, a first oil port is provided at the bottom of the cylinder barrel, a second oil port is provided on the end face of the base, the first oil port communicates with the second oil port through the first hydraulic oil passage, and the first oil port communicates with the rodless cavity inside the piston rod assembly;

[0012] The rotary coupling includes a rotary core and a housing. A third oil port is provided on the rotary core, and a fourth oil port is provided on the housing. The second oil port is communicated with the third oil port, and the third oil port is communicated with the fourth oil port through a second oil passage.

[0013] Optionally, a third oil passage is provided inside the base. A fifth oil port is provided on the side wall of the cylinder barrel, and a sixth oil port is provided on the end face of the base. The fifth oil port is communicated with the sixth oil port through the third oil passage, and the fifth oil port is communicated with the rod chamber inside the piston rod assembly.

[0014] A fourth oil passage is provided inside the rotary coupling. A seventh oil port is provided on the rotary core, and an eighth oil port is provided on the housing. The sixth oil port is communicated with the seventh oil port, and the seventh oil port is communicated with the eighth oil port through the fourth oil passage.

[0015] Optionally, a spring is provided in the piston rod assembly. The two ends of the spring are respectively connected with the guide sleeve and the piston inside the piston rod assembly. The spring is used to balance the centrifugal force when the variable-diameter fan rotates and prevent the diameter of the variable-diameter fan blade from exceeding the preset diameter threshold.

[0016] Optionally, a sealing ring and a support bearing are provided between the rotary core and the housing. The sealing ring is used to prevent oil leakage, and the support bearing is used to support the rotary core. The support bearing is fixedly connected with the housing.

[0017] Optionally, the guide sleeve inside the piston rod assembly is connected with the piston rod. The guide sleeve is fixedly arranged in the cylinder barrel of the base, and the end face of the guide sleeve is attached to the end face of the cylinder barrel.

[0018] In a second aspect, an embodiment of the present application provides a heat dissipation system, including the variable-diameter speed-regulating fan as described in the first aspect above and / or various possible variable-diameter speed-regulating fans in the first aspect. The system further includes: a hydraulic oil tank, a cooling pump, a solenoid valve, and a heat dissipation motor, where:

[0019] The hydraulic oil tank is used to store hydraulic oil, and the oil temperature of the hydraulic oil is the control signal source for the variable-diameter regulating fan.

[0020] The cooling pump is connected with the hydraulic oil tank and the solenoid valve. The cooling pump is used to pressurize the oil to obtain pressurized oil and pump the pressurized oil to the solenoid valve. The pressurized oil is used to drive the heat dissipation motor to rotate.

[0021] The solenoid valve is used to regulate the flow rate of the pressurized oil and deliver the pressurized oil to the heat dissipation motor.

[0022] The heat dissipation motor is connected with the hydraulic oil tank and the solenoid valve and is used to drive the variable-diameter speed-regulating fan to rotate.

[0023] In a third aspect, an embodiment of the present application provides a heat dissipation system control method. The heat dissipation system includes the variable-diameter speed-regulating fan as described in the first aspect above and / or various possible variable-diameter speed-regulating fans in the first aspect. The control method includes:

[0024] Get the current hydraulic oil temperature;

[0025] Control and adjust the displacement of the cooling pump and the power-on status of the solenoid valve according to the oil temperature;

[0026] Control the rotation speed and direction of the cooling motor according to the displacement and power-on status;

[0027] The operating speed and blade diameter of the variable-diameter speed-regulating fan are controlled according to the power-on state, rotation speed and rotation direction.

[0028] Optionally, the operating speed and blade diameter of the variable-diameter speed-adjustable fan are controlled according to the power-on state, the rotation speed, and the rotation direction, including:

[0029] If the rotation direction is forward and the rotation speed is the maximum rotation speed of the heat dissipation motor, the variable diameter speed regulating fan is controlled to rotate forward synchronously with the heat dissipation motor at the maximum operating speed, and the maximum operating speed is less than or equal to the operating speed corresponding to the preset noise threshold;

[0030] If the oil temperature is greater than a preset temperature threshold after the cooling motor has run for a target time, the piston rod assembly of the variable diameter speed regulating fan is controlled to extend outward to a maximum length according to the power-on state, so that the fan blade diameter increases to a maximum diameter.

[0031] In a fourth aspect, an embodiment of the present application provides an engineering machinery, comprising the first aspect above and / or various possible variable-diameter and speed-regulating fans of the first aspect.

[0032] The variable diameter speed-adjustable fan, heat dissipation system, control method and engineering machinery provided by the embodiment of the present application, the variable diameter speed-adjustable fan includes a fan blade assembly, a piston rod assembly, a base, and a rotating coupling. The fan blade assembly is composed of variable diameter fan blades, and the piston rod assembly includes a piston rod, which is connected to the fan blade assembly through a screw connection. The piston rod is arranged in the base and can be extended and retracted. The telescopic range of the piston rod determines the change amplitude of the fan blade, that is, the change in the diameter of the variable diameter fan blade. This design enables the fan to adjust the size of the fan blade as needed to control the air volume. The base provides support for the entire fan, and a first oil channel is provided in the base, which drives the piston rod to extend and retract by conveying oil, thereby realizing the diameter adjustment of the fan blade. The rotating coupling is used to connect the base with the heat dissipation motor, carry and transmit the rotational power. A second oil channel is provided inside the rotating coupling, which is connected to the first oil channel of the base to ensure that the fan blade assembly rotates with the heat dissipation motor, and at the same time, the telescopic range of the piston rod and the speed of the fan blade are adjusted by conveying oil. Therefore, by adjusting the rotation speed and the fan blade diameter, a dual adjustment effect can be achieved, and the air volume can be adjusted according to demand, thereby achieving a wide adjustment range from low air volume to high air volume. By adopting different combinations of rotation speed and fan blade diameter, different usage scenarios can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0034] Figure 1 Schematic structural diagram of a variable-diameter speed-regulating fan provided by an embodiment of this application;

[0035] Figure 2 Schematic sectional structural diagram of a variable-diameter speed-regulating fan provided by an embodiment of this application;

[0036] Figure 3 Front view of a variable-diameter speed-regulating fan provided by an embodiment of this application;

[0037] Figure 4 Schematic structural diagram of a rotary coupling provided by an embodiment of this application;

[0038] Figure 5 Schematic structural diagram of a base provided by an embodiment of this application;

[0039] Figure 6 Schematic structural diagram of a piston rod assembly provided by an embodiment of this application;

[0040] Figure 7 Schematic structural diagram of a heat dissipation system provided by an embodiment of this application;

[0041] Figure 8 Schematic structural diagram of another variable-diameter speed-regulating fan provided by an embodiment of this application;

[0042] Figure 9 Schematic sectional structural diagram of another variable-diameter speed-regulating fan provided by an embodiment of this application;

[0043] Figure 10 Front view of another variable-diameter speed-regulating fan provided by an embodiment of this application;

[0044] Figure 11 Schematic structural diagram of another rotary coupling provided by an embodiment of this application;

[0045] Figure 12 Schematic structural diagram of another base provided by an embodiment of this application;

[0046] Figure 13 Schematic structural diagram of another piston rod assembly provided by an embodiment of this application;

[0047] Figure 14 Schematic structural diagram of another heat dissipation system provided by an embodiment of this application;

[0048] Figure 15Schematic flowchart of the heat dissipation system control method provided by the embodiment of the present application;

[0049] Figure 16 Schematic structural diagram of the controller provided by the embodiment of the present application.

[0050] Reference numerals:

[0051] 100 - Variable - diameter speed - regulating fan;

[0052] 110 - Blade assembly; 111 - Variable - diameter blade;

[0053] 120 - Piston rod assembly; 121 - Piston rod; 122 - Guide sleeve; 123 - Piston; 124 - Outer sealing ring; 125 - Inner sealing ring;

[0054] 130 - Base; 131 - Cylinder barrel; A201 - First oil passage; A21 - First oil port; A22 - Second oil port; B201 - Third oil passage; B21 - Fifth oil port; B22 - Sixth oil port;

[0055] 140 - Rotary coupling; 141 - Rotary core; 142 - Housing; 143 - Sealing ring; 144 - Support bearing; 145 - End cover; A202 - Second oil passage; A23 - Third oil port; A24 - Fourth oil port; B202 - Fourth oil passage; B23 - Seventh oil port; B24 - Eighth oil port;

[0056] 150 - Fastening screw;

[0057] 160 - Plug. Detailed implementation manners

[0058] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0059] The terms "first", "second", "third", "fourth", etc. in the specification, claims and above - mentioned drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances. For example, without departing from the scope of this article, the first information can also be called the second information, and similarly, the second information can also be called the first information.

[0060] Depending on the context, as used herein, the word "if" can be interpreted as "when" or "while" or "in response to determining".

[0061] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to also include the plural forms unless the context clearly dictates otherwise.

[0062] It should be further understood that the terms "comprising", "including" indicate the presence of the features, steps, operations, elements, components, items, species, and / or groups, but do not preclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, items, species, and / or groups.

[0063] The term "or" and "and / or" as used herein are interpreted inclusively and mean any one or any combination. Thus, "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". An exception to this definition only occurs when the combination of elements, functions, steps or operations are mutually exclusive in some manner.

[0064] In the related art, the main body of the fan blade of a cooling fan is generally a nylon part, and the skeleton of the fan blade is generally a metal insert for connecting to the cooling motor of the whole machine. Once the fan blade is designed and manufactured, its shape will be fixed, and many parameters including the fan blade diameter will remain unchanged. Therefore, the fan blade cannot adjust its own parameters according to the different heat dissipation requirements of the hydraulic system, and thus cannot provide the most efficient cooling air volume for the hydraulic system. There is a contradiction between the variability of the heat dissipation requirements with the working conditions and the environment in construction machinery and the certainty of the parameters after the fan is manufactured. Currently, the required heat dissipation is usually adjusted by adjusting the fan speed. However, the minimum displacement of the pump and the motor limits the minimum speed of the fan, and the noise exceeding the standard limits the maximum speed of the fan. Therefore, relying solely on speed adjustment to dissipate heat cannot better meet the engineering needs.

[0065] The variable-diameter speed-regulating fan provided by the present application, on the basis of considering the influence of the heat dissipation motor on the fan speed, further considers changing the fan blade diameter through the piston rod, so as to combine the control of the speed and the fan blade diameter and perform dual regulation on the air volume. Specifically, by adopting the design of the piston rod assembly and the variable-diameter fan blade, and further through the oil control of the first oil passage in the base and the second oil passage in the rotary coupling, the dynamic regulation of the fan blade diameter and the speed is realized. The fan can automatically adjust the fan blade diameter and the speed according to different heat dissipation requirements to provide the most suitable cooling air volume, thus overcoming the problem in the prior art that the fan blade parameters are fixed and the heat dissipation amount cannot be adjusted according to the working conditions and environmental changes. Thereby, the fan no longer solely relies on speed regulation to control the heat dissipation amount, avoiding the limitations of the speed being restricted by the minimum displacement and the noise exceeding the standard, and being able to more precisely and flexibly meet the heat dissipation requirements of the system under various working conditions, improving the heat dissipation efficiency of the system, and at the same time reducing the noise and energy consumption.

[0066] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0067] In the present application, taking the controller as the execution entity, the heat dissipation system control method of the following embodiments is executed. Specifically, the execution entity can be the hardware device of the controller, or the software application in the controller that implements the following embodiments, or the computer-readable storage medium installed with the software application that implements the following embodiments, or the code of the software application that implements the following embodiments.

[0068] Figure 1 It is a schematic structural diagram of the variable-diameter speed-regulating fan provided by the embodiment of the present application. Figure 2 It is a schematic cross-sectional structural diagram of the variable-diameter speed-regulating fan provided by the embodiment of the present application. Figure 3 It is a front view of the variable-diameter speed-regulating fan provided by the embodiment of the present application. Figure 4 It is a schematic structural diagram of the rotary coupling provided by the embodiment of the present application. Figure 5 It is a schematic structural diagram of the base provided by the embodiment of the present application. Figure 6 It is a schematic structural diagram of the piston rod assembly provided by the embodiment of the present application.

[0069] As Figures 1 to 5 shown, the variable-diameter speed-regulating fan 100 includes: a fan blade assembly 110, a piston rod assembly 120, a base 130, and a rotary coupling 140, wherein:

[0070] The fan blade assembly 110 is screwed and connected with the piston rod 121 in the piston rod assembly 120, and the fan blade assembly 110 includes a variable diameter fan blade 111;

[0071] The piston rod assembly 120 is disposed inside the base 130 , and the piston rod assembly 120 is retractable;

[0072] It should be noted that the telescopic range of the piston rod assembly 120 determines the telescopic length of the variable diameter blade 111, and further determines the diameter variation range thereof.

[0073] The base 130 is fixedly connected to the rotating coupling 140. A first oil channel A201 is provided inside the base 130. The first oil channel A201 communicates with the piston rod assembly 120 and the rotating coupling 140.

[0074] The rotary coupling 140 is connected to the heat dissipation motor. A second oil channel A202 is provided in the rotary coupling 140 . The first oil channel A201 is communicated with the second oil channel A202 .

[0075] In this embodiment, the base 130 is connected to the motor shaft through the rotating coupling 140 located therebetween, and the first oil channel A201 and the second oil channel A202 are connected to ensure that the oil can be transmitted between the base 130 and the rotating coupling 140, and further transmitted to the piston rod assembly 120. By adjusting the telescopic range of the piston rod assembly 120, the telescopic length of the variable diameter blade 111 and the diameter variation range thereof are adjusted. When the oil flows, the piston rod 121 can be pushed to expand and contract, thereby changing the size of the blade assembly 110 and realizing the diameter change of the variable diameter blade 111.

[0076] The piston rod assembly 120 includes a piston rod 121, which is connected to the fan blade assembly 110 through a screw connection. The piston rod 121 is arranged in the base 130 and can be extended. The extension range of the piston rod 121 determines the change range of the variable diameter fan blade 111, so that the variable diameter speed regulating fan 100 can adjust the size of the variable diameter fan blade 111 as needed to control the air volume.

[0077] The base 130 provides support for the entire fan. A first oil channel A201 is provided in the base 130, which drives the piston rod 121 to extend and retract by conveying oil, thereby achieving diameter adjustment of the variable diameter blade 111.

[0078] The rotating coupling 140 is used to connect the base 130 and the heat dissipation motor, and to carry and transmit the rotational power. A second oil channel A202 is provided inside the rotating coupling 140, which is connected to the first oil channel A201 in the base 130. The function of the rotating coupling 140 is to ensure that the fan assembly 110 rotates with the heat dissipation motor, and at the same time, to adjust the extension and contraction of the piston rod 121 by delivering oil.

[0079] Exemplarily, the rotational speed of the variable-diameter adjustable fan 100 can be adjusted between "slow" and "fast". A lower rotational speed is suitable for environments that require low air volume and can reduce energy consumption; a higher rotational speed is suitable for scenarios that require high air volume and can increase the wind speed and air volume of the fan. The diameter of the variable-diameter fan blade 111 can be selected between "small" and "large". A smaller fan blade diameter is suitable for environments with low air volume and can reduce power consumption; a larger fan blade diameter is suitable for high air volume requirements and can provide greater air flow and stronger wind force.

[0080] When the system is in the low power consumption stage, the "slow-small" combined energy-saving mode can be selected. At this time, the rotational speed of the fan is slow and the fan blade diameter is small, thereby reducing the air volume and energy consumption. It is suitable for environments with high energy-saving requirements, such as the standby state or low-load operation. When the system is in the low speed and high torque state, the "slow-large" combined off-road mode can be selected. At this time, it rotates at a low speed, but the fan blade diameter is large. With the help of the large area of the fan blade, it can provide a large air flow and can be used in environments that require a large air volume but a low rotational speed, such as in a relatively complex working environment (such as under a large air flow field), to increase the stability and torque output of the system. When the system is in the high power consumption stage, the "fast-large" efficiency mode can be selected. At this time, the rotational speed of the fan is fast and the fan blade diameter is large, which can provide the maximum air volume and efficiency and is suitable for high-load work that requires a large amount of air flow, such as the requirements of the heat dissipation system under high load. For other working conditions, the "fast-small" economic mode can be selected. At this time, the rotational speed of the fan is fast, but the diameter of the fan blade is small, which can provide a fast air flow and maintain a certain economy and efficiency. It is suitable for general daily use scenarios to ensure the balance and adaptability of the fan operation. These four modes can intelligently adjust the air volume and energy efficiency according to different combinations of the rotational speed of the fan and the diameter of the fan blade, depending on different working environments or requirements.

[0081] It can be understood that the oil fluid flows through the first oil fluid channel and the second oil fluid channel to control the telescopic movement of the piston rod, thereby adjusting the size of the fan blade. The flow rate and pressure of the oil fluid can precisely control the telescopic degree of the piston rod, thereby changing the diameter of the fan blade. By adjusting the diameter of the fan blade, the fan can achieve air volume adjustment. When the piston rod assembly telescopes, it directly affects the diameter of the fan blade. A fan blade with a larger diameter can provide greater air flow and stronger wind force, increasing the air volume; while a smaller fan blade can reduce air flow and wind resistance, reducing the air volume. At the same time, as the heat dissipation motor rotates, the fan blade assembly can rotate synchronously with the heat dissipation motor. By controlling the rotational speed of the heat dissipation motor, the rotational speed of the fan blade can be adjusted. Thus, through the dual adjustment mechanism of diameter and rotational speed, a large-span air volume adjustment can be achieved.

[0082] Based on the above embodiments, as Figures 1 to 6As shown, the variable-diameter speed-adjustable fan 100 further includes a plug 160 and a fastening screw 150. The fan blade assembly 110 is screwed and connected to the threaded hole on the piston rod 121 in the piston rod assembly 120 through the end thread. The plug 160 is arranged on the base 130 for closing the third hydraulic fluid passage B201. The base 130 and the rotary coupling 140 are connected together by the fastening screw 150.

[0083] As Figure 4 shown, the left side A-A is a cross-sectional view of the corresponding A-A part on the right side. The rotary coupling 140 includes a rotary core 141, a housing 142, a sealing ring 143, a support bearing 144, and an end cover 145. Among them, the rotary core 141 can rotate freely under the drive of the heat dissipation motor, and the rotation direction is determined by the drive direction of the heat dissipation motor.

[0084] As Figures 2 to 6 shown, the base 130 is provided with a cylinder barrel 131. The number of cylinder barrels 131 is the same as the number of variable-diameter fan blades 111. The bottom of the cylinder barrel 131 is provided with a first oil port A21, and the end face of the base 130 is provided with a second oil port A22. The first oil port A21 is communicated with the second oil port A22 through the first hydraulic fluid passage A201. The first oil port A21 is communicated with the rodless cavity in the piston rod assembly 120;

[0085] The rotary coupling 140 includes a rotary core 141 and a housing 142. The rotary core 141 is provided with a third oil port A23, and the housing 142 is provided with a fourth oil port A24. The second oil port A22 is communicated with the third oil port A23, and the third oil port A23 is communicated with the fourth oil port A24 through the second hydraulic fluid passage A202.

[0086] Exemplarily, when the number of cylinder barrels 131 is 5, that is, the number of variable-diameter fan blades is 5, there are 5 corresponding first oil ports A21, which are A2101, A2102, A2103, A2104, and A2105 in sequence.

[0087] In this embodiment, each variable-diameter fan blade 111 corresponds to a cylinder barrel 131, and hydraulic fluid is synchronously transmitted through 5 first oil ports A21 (A2101 to A2105). At the same time, the first oil port A21 is communicated with the rodless cavity in the piston rod assembly 120, allowing the hydraulic fluid to flow into the rodless cavity side, pushing the piston rod assembly 120 to move outward, thereby controlling the variable-diameter fan blades 111 to extend outward synchronously.

[0088] In this embodiment, the base 130 internally is provided with a third hydraulic fluid passage B201. The side wall of the cylinder barrel 131 is provided with a fifth oil port B21, and the end face of the base 130 is provided with a sixth oil port B22. The fifth oil port B21 is communicated with the sixth oil port B22 through the third hydraulic fluid passage B201. The fifth oil port B21 is communicated with the rod cavity in the piston rod assembly 120;

[0089] The rotating coupling 140 is provided with a fourth hydraulic fluid passage B202 therein. The rotating core 141 is provided with a seventh oil port B23, and the housing 142 is provided with an eighth oil port B24. The sixth oil port B22 communicates with the seventh oil port B23, and the seventh oil port B23 communicates with the eighth oil port B24 through the fourth hydraulic fluid passage B202.

[0090] Correspondingly, the base 130 is provided with 10 fifth oil ports B21 therein, namely B2101, B2102, B2103, B2104, B2105, B2106, B2107, B2108, B2109, and B2110. Among them, starting from B2101, every two oil ports are arranged on the side wall of the same cylinder barrel 131, and an annular oil groove is provided between adjacent cylinder barrels 131 for mutual communication.

[0091] It can be understood that by providing a plurality of hydraulic fluid passages and oil ports (such as the third hydraulic fluid passage B201, the fourth hydraulic fluid passage B202, the fifth oil port B21, the sixth oil port B22, the seventh oil port B23, and the eighth oil port B24), a fan blade retraction oil circuit can be formed to realize fan blade retraction.

[0092] In this embodiment, a seal ring installation groove is further provided on the end face of the base 130, and a seal ring is provided between the base 130 and the rotating coupling 140.

[0093] As Figure 4 shown, a seal ring 143 is provided between the rotating core 141 and the housing 142 to prevent hydraulic fluid leakage.

[0094] Specifically, the number of the seal rings 143 can be three. The middle seal ring is used to isolate the oil passage to prevent oil from flowing between the second hydraulic fluid passage A202 and the fourth hydraulic fluid passage B202 on the rotating core 141, and the seal rings at both ends are used to prevent hydraulic fluid from leaking to the outside of the rotating coupling 140.

[0095] Optionally, a support bearing 144 is provided between the rotating core 141 and the housing 142 to support the rotating core 141. The support bearing 144 is fixedly connected to the housing 142. The hydraulic fluid in the second hydraulic fluid passage A202 can provide lubrication and cooling for the support bearing 144.

[0096] It can be understood that the support bearing 144 provides necessary support for the rotating core 141, ensuring that the rotating core 141 remains stable during rotation, avoiding tilting or uneven movement, reducing the contact surface friction between the rotating core 141 and the housing 142, lowering the frictional force and wear, thereby improving the service life and operating efficiency of the fan. Additionally, the support bearing 144 enhances the load-bearing capacity between the rotating core 141 and the housing 142, capable of withstanding a relatively large load, ensuring that the fan can operate with a relatively large diameter and rotational speed, and enhancing the strength and reliability of the overall structure.

[0097] Figure 5 The right side A-A is a sectional view corresponding to the A - A part on the left side. Figure 6 The right side A-A is a sectional view corresponding to the A - A part on the left side. As Figure 5 and Figure 6 As shown, in this embodiment, the piston rod assembly 120 includes a piston rod 121, a guide sleeve 122, a piston 123, an outer sealing ring 124, and an inner sealing ring 125. Among them, one end of the piston rod 121 is connected to the piston 123 through a tight fit, and the inner and outer parts of the piston 123 are respectively provided with an inner sealing ring 125 and an outer sealing ring 124. A threaded hole for connecting with the variable-diameter fan blade 111 is reserved at the center of the other end of the piston rod 121, and its outer periphery is connected to the guide sleeve 122. The inner and outer parts of the guide sleeve 122 are respectively provided with an inner sealing ring 125 and an outer sealing ring 124. The outer periphery of the guide sleeve 122 is connected to the inner wall of the cylinder barrel 131 through a tight fit, and the stepped end face of the guide sleeve 122 is in contact with the end face of the cylinder barrel 131.

[0098] In this embodiment, the guide sleeve 122 inside the piston rod assembly 120 is connected to the piston rod 121, the guide sleeve 122 is fixedly arranged in the cylinder barrel 131 of the base 130, and the end face of the guide sleeve 122 is in contact with the end face of the cylinder barrel 131.

[0099] It can be understood that the guide sleeve 122 is fixed in the cylinder barrel 131, which can provide stable guidance for the piston rod 121, prevent the piston rod from shifting or jamming during movement, and ensure the smooth movement of the piston rod. Additionally, the contact between the end face of the guide sleeve 122 and the end face of the cylinder barrel 131 helps to share the movement pressure of the piston rod 121, reduce the frictional force between the piston rod and the cylinder barrel, reduce wear, and improve the service life of the system.

[0100] Optionally, a keyway hole for connecting with the heat dissipation motor is left on the other end face of the rotating core 141 in the rotary coupling 140. The end face of the support bearing 144 is connected to the housing 142 by a fastening screw 150 through an end cover 145. The housing 142 is also provided with fastening screw mounting holes for installing and fixing the rotary coupling 140. The rotary coupling 140 and the heat dissipation motor can be fixed on the same fixing bracket to reduce the number of fixing brackets.

[0101] It can be understood that by sharing a fixed bracket for the rotary coupling and the cooling motor, the installation complexity can be reduced.

[0102] Figure 7 The structural schematic diagram of the cooling system provided by the embodiment of the present application is as follows. As Figure 7 shown, it includes a variable-diameter speed-regulating fan as in the above embodiment, and the system further includes: a hydraulic oil tank, a cooling pump, a solenoid valve, and a cooling motor, where:

[0103] The hydraulic oil tank is used to store hydraulic oil, and the oil temperature of the hydraulic oil is the control signal source for the variable-diameter regulating fan;

[0104] The cooling pump is connected to the hydraulic oil tank and the solenoid valve. The cooling pump is used to pressurize the oil fluid to obtain pressurized oil and pump the pressurized oil to the solenoid valve. The pressurized oil is used to drive the cooling motor to rotate;

[0105] The solenoid valve is used to regulate the flow rate of the pressurized oil and convey the pressurized oil to the cooling motor;

[0106] The cooling motor is connected to the hydraulic oil tank and the solenoid valve and is used to drive the variable-diameter speed-regulating fan to rotate.

[0107] In this embodiment, for Figures 2 to 6 the shown variable-diameter regulating fan, the cooling system includes two solenoid valves, namely solenoid valve 1 and solenoid valve 2. Both solenoid valves are three-position four-way valves. For solenoid valve 1, it is used to control the diameter change of the fan blades. P1 is the pressure oil inlet, connected to the cooling pump to provide system pressure oil. T1 is the oil return port, connected to the hydraulic oil tank for the hydraulic oil to return. A1 and B1 are both actuator interfaces, respectively connected to A2 (i.e., the fourth oil port A24) and B2 (i.e., the eighth oil port B24) of the rotary coupling, respectively controlling the extension and retraction of the fan blades. 2D is the left solenoid (left coil). When energized, it pushes the spool to the left position, making B1 communicate with P1. 3D is the right solenoid (right coil). When energized, it pushes the spool to the right position, making A1 communicate with P1. When no solenoid is energized, it resets to the middle position.

[0108] For solenoid valve 2, it is used to control the rotation speed of the fan. The pressure inlet P2 is connected to the cooling pump. The oil return port T2 is connected to the hydraulic oil tank. The actuator interfaces A3 and B3 are respectively connected to the A port and B port of the cooling motor M1, respectively controlling the forward and reverse rotation of the fan. 4D is the left solenoid (left coil). When energized, it pushes the spool to the left position, making B3 communicate with P2. 5D is the right solenoid (right coil). When energized, it pushes the spool to the right position, making A3 communicate with P2. When no solenoid is energized, it resets to the middle position.

[0109] It can be understood that by the controller outputting a Pulse Width Modulation (PWM) signal, the control current change of the displacement regulating solenoid valve 1D in the cooling pump can be changed, thereby changing the pump displacement. Through the system flow rate change (Q 系统流量 =V 泵排量 *n 泵转速 ), the rotational speed (n 马达转速 =Q 系统流量 / V 马达排量 ) of the fixed-displacement cooling motor M1 can be changed, thereby adjusting the rotational speed of the fan.

[0110] As Figures 2 to 7 shown, the fourth oil port A24 and the eighth oil port B24 on the housing 142 of the rotary coupling 140 are respectively connected to A1 and B1 of the solenoid valve 1 in the external oil circuit of the heat dissipation system through oil pipelines. Through the rotary core 141 of the rotary coupling 140, the pressure oil can be transmitted to the first oil port A21 and the fifth oil port B21 on the base 130, and finally drive the piston rod 121 in the piston rod assembly 120 to move.

[0111] In this embodiment, for the process of the fan blade extending outwards, the 3D of the solenoid valve 1 is powered on, the A1 of the solenoid valve 1 is connected to the cooling pump P1, and the B1 of the solenoid valve 1 is connected back to the hydraulic oil tank. Specifically, the pressure oil is transmitted from the pump port through the A1 of the solenoid valve 1 to the fourth oil port A24 on the housing 142 of the rotary coupling 140, enters the annular oil groove in the rotary core 141, passes through the annular oil groove and enters the second oil passage A202 in the rotary core 141, and is transmitted to the third oil port A23 on the rotary core 141. Since the third oil port A23 at the end of the rotary core 141 of the rotary coupling 140 is connected to the second oil port A22 on the end face of the base 130, the oil can enter the base 130 through the third oil port A23 and the second oil port A22, and through the first oil passage A201 in the base 130, it is respectively transmitted to the first oil port A21 (A2101 - A2105) at the bottom of the cylinder 131 in the base 130, and finally enters the rodless cavity in the piston rod assembly 120. Thus, the piston rod assembly 120 is pushed to move outwards. Since the variable-diameter fan blade 111 is connected to the piston rod assembly 120 by a thread, the fan blade extends outwards and the fan blade diameter increases.

[0112] For the process of the fan blade retraction, the 2D of the solenoid valve 1 is energized. The A1 of the solenoid valve 1 is connected back to the hydraulic oil tank, and the B1 of the solenoid valve 1 is connected to the cooling pump P1. Specifically, the pressure oil is transmitted from the pump port through the B1 of the solenoid valve 1 to the eighth oil port B24 on the housing 142 of the rotary coupling 140, enters the annular oil groove in the rotary core 141, passes through the annular oil groove and enters the fourth oil passage B202 in the rotary core 141, and is transmitted to the seventh oil port B23 on the rotary core 141. Since the seventh oil port B23 at the end of the rotary core 141 of the rotary coupling 140 is connected to the sixth oil port B22 on the end face of the base 130, the oil can enter the base 130 through the seventh oil port B23 and the sixth oil port B22, and is transmitted through the third oil passage B201 in the base 130 to the fifth oil ports B21 (B2101 - B2110) on the side wall of the cylinder barrel 131 in the base 130, and finally enters the rod cavity in the piston rod assembly 120. Thus, the piston rod assembly 120 is pushed to move inward. Since the variable-diameter fan blade 111 is connected to the piston rod assembly 120 by threads, the fan blade retracts and the fan blade diameter decreases.

[0113] In some embodiments, by controlling the 5D of the solenoid valve 2 to be energized, controlling the pressure oil to enter from the B port of the cooling motor and the A port of the cooling motor to be connected back to the oil tank, the variable-diameter adjustable fan connected to the cooling motor can be reversed for dust removal.

[0114] On the basis of the above embodiments, Figure 8 This is a schematic structural diagram of another variable-diameter speed-regulating fan provided by the embodiment of the present application. Figure 9 This is a schematic cross-sectional structure diagram of another variable-diameter speed-regulating fan provided by the embodiment of the present application. Figure 10 This is a front view of another variable-diameter speed-regulating fan provided by the embodiment of the present application. Figure 11 This is a schematic structural diagram of another rotary coupling provided by the embodiment of the present application, Figure 11 The left side A - A is a cross-sectional view corresponding to the A - A part on the right side. Figure 12 This is a schematic structural diagram of another base provided by the embodiment of the present application, Figure 12 The right side A - A is a cross-sectional view corresponding to the A - A part on the left side.

[0115] Figure 13 This is a schematic structural diagram of another piston rod assembly provided by the embodiment of the present application, Figure 13 The right side A - A is a cross-sectional view corresponding to the A - A part on the left side.

[0116] Such as Figures 8 to 13As shown, a spring 126 is also provided in the piston rod assembly 120. The two ends of the spring 126 are respectively assembled and connected to the guide sleeve 122 and the piston 123 inside the piston rod assembly 120. The spring 126 is used to balance the centrifugal force when the variable-diameter fan 100 rotates, and prevent the diameter of the variable-diameter fan blade 111 from exceeding the preset diameter threshold.

[0117] In this embodiment, only the first hydraulic fluid passage A201 and the second hydraulic fluid passage A202 are retained, and the third hydraulic fluid passage B201 and the fourth hydraulic fluid passage B202 (retraction oil circuit) are cancelled. At the same time, the plug 160 is cancelled. The piston rod 121 is retracted by the spring 126 instead of the hydraulic oil pressure. Accordingly, as Figure 11 shown, the number of the sealing rings 143 between the rotating core 141 and the housing 142 is two. The middle sealing ring is cancelled, and only the leakage of the hydraulic fluid to the outside of the rotary coupling 140 needs to be prevented.

[0118] It should be noted that, in addition to the above differences, Figures 8 to 13 the implementation manner of the embodiment shown in Figures 1 to 6 is similar to that of the embodiment shown in

[0119] and will not be elaborated here in this embodiment.

[0120] Figure 14 It is a schematic structural diagram of another heat dissipation system provided by the embodiment of the present application. As Figure 14 shown, for Figures 8 to 13 the variable-diameter adjustable fan shown, the solenoid valve 1 in this heat dissipation system is a two-position two-way valve.

[0121] For the solenoid valve 1, the on-off is controlled by a single electromagnet (3D), and the spring is reset, which is used to control the diameter of the fan blade. The pressure inlet P1 is connected to the cooling pump to provide the system pressure. The oil return port T1 is connected to the hydraulic oil tank for the return of the hydraulic oil. A1 is an actuator interface, which is connected to A2 (i.e., the third oil port A23) of the rotary coupling to control the extension of the fan blade. When the solenoid valve is in the working position, that is, when 3D is powered on, the valve core is pushed to move, so that A1 is communicated with P1. When 3D is powered off, the valve core resets.

[0122] In this embodiment, for the specific implementation process of the fan blade extension, reference can be made to the above embodiment. The implementation principle and technical effects are similar, and will not be elaborated here.

[0123] For the fan blade retraction process, the 3D of solenoid valve 1 is de-energized, the A1 port of solenoid valve 1 is connected back to the fuel tank, there is no pressure oil in the rodless cavity of the piston rod, and under the pre-tightening force of the spring, the piston rod assembly is in the retracted state, and the diameter of the fan blade is the smallest.

[0124] Figure 15 It is a schematic flowchart of the heat dissipation system control method provided by the embodiment of the present application. As Figure 15 shown, the heat dissipation system includes a variable-diameter speed-regulating fan as in the above embodiment. The method of this embodiment may include the following steps:

[0125] S101. Obtain the oil temperature of the current hydraulic oil.

[0126] In this embodiment, the real-time temperature of the hydraulic oil can be obtained through a sensor or a measuring device as the basic data for the controller to perform control.

[0127] S102. Control and adjust the displacement of the cooling pump and the energized state of the solenoid valve according to the oil temperature.

[0128] In this embodiment, by comparing the oil temperature of the hydraulic oil with a preset temperature threshold, such as 60 °C, if it is greater than the temperature threshold, it indicates that it is in a high-temperature environment and the system needs to operate in a high-temperature mode, otherwise it switches to a low-temperature mode.

[0129] Specifically, if it is in the high-temperature mode, it is necessary to adjust and increase the displacement of the cooling pump and adjust the energized state of the solenoid valve to increase the rotation speed and the diameter of the fan blade. If it is in the low-temperature mode, the fan blade can be controlled to retract to a smaller diameter and the fan can be controlled to operate at a slower speed.

[0130] S103. Control the rotation speed and rotation direction of the heat dissipation motor according to the displacement and energized state.

[0131] Among them, the displacement of the cooling pump affects the rotation speed of the heat dissipation motor, and the energized state of the solenoid valve affects the rotation direction of the heat dissipation motor.

[0132] S104. Control the operating speed and the diameter of the fan blade of the variable-diameter speed-regulating fan according to the energized state, rotation speed and rotation direction.

[0133] Among them, the operating speed of the variable-diameter speed-regulating fan is determined by the rotation speed of the heat dissipation motor, and the diameter of the fan blade is determined by the rotation direction of the heat dissipation motor and the energized state of the solenoid valve.

[0134] As an example, when the system completes self-check, the system detects the oil temperature t1 at startup. When t1 < 60°C, the controller outputs a control signal to the cooling pump, and changes the current of the displacement regulating solenoid valve to make the cooling pump work at the maximum displacement. The control signal is output to make the 5D of solenoid valve 2 get powered, the A3 of solenoid valve 2 connects to the pressure oil at the P2 port of the cooling pump, the B3 port of solenoid valve 2 connects back to the fuel tank. The pressure oil enters the B port of the heat dissipation motor from the pump port through the A3 port of solenoid valve 2. When the heat dissipation motor returns oil, it flows back to the fuel tank from the A port of the heat dissipation motor through the B3 port of solenoid valve 2. At this time, the heat dissipation motor rotates in reverse at the maximum speed to remove ash. After the ash removal is completed after time T1 (T1 < 2 min), the 5D of solenoid valve 2 is powered off, and the heat dissipation motor gradually decelerates until it stops rotating in reverse. Finally, the cooling pump is controlled to work at the minimum displacement, thereby saving energy consumption.

[0135] Among them, the ash removal duration of 2 minutes is determined according to historical working condition data. Usually, in a medium dust environment for construction machinery, within 2 minutes, the reverse airflow can remove 80% - 90% of the loose ash deposits (particle size < 50 μm).

[0136] As another example, when the system detects that the oil temperature t1 > 60°C, the controller outputs a control signal to the cooling pump, and changes the current of the displacement regulating solenoid valve to gradually increase the displacement of the cooling pump. The controller outputs a control signal to make the 4D of solenoid valve 2 get powered, the B3 port of solenoid valve 2 connects to the pressure oil at the P2 port of the cooling pump, the A3 port of solenoid valve 2 connects back to the fuel tank. The pressure oil enters the A port of the heat dissipation motor from the cooling pump port through the B3 port of solenoid valve 2. When the heat dissipation motor returns oil, it flows back to the fuel tank from the B port of the heat dissipation motor through the A3 port of solenoid valve 2. At this time, the motor rotates forward, and drives the fan to rotate forward through the rotary coupling, increasing the cooling air volume to control the continuous increase of the oil temperature. After time T2, if the oil temperature t1 > 60°C and the heat dissipation effect is not good, the controller increases the displacement of the cooling pump until it reaches the maximum displacement of the cooling pump. At this time, the fan speed gradually increases until it reaches the maximum speed allowed by the noise. If t1 < 60°C after time T2, the current fan speed is maintained, and the system periodically scans and detects the oil temperature data and reports it to the controller. Among them, time T2 is any preset duration, such as 30 min.

[0137] It can be understood that by intelligently controlling the rotation speed and the diameter of the fan blades, the heat dissipation efficiency can be adjusted according to the temperature change, further optimizing the operation of the heat dissipation system, maintaining the stability of the oil temperature, and improving the energy usage efficiency. The entire control process realizes the automatic monitoring and adjustment of the hydraulic oil temperature, ensuring that the heat dissipation system operates within an appropriate temperature range. By adjusting the working states of the cooling pump, the heat dissipation motor, and the variable-diameter speed-regulating fan, the energy usage of the system is optimized, avoiding resource waste. By maintaining an appropriate oil temperature, the damage to the system caused by overheating is reduced, and the service life of the system and its key components can be extended. The real-time adjustment of the temperature helps to maintain the stability and efficiency of the system, reducing the failures or efficiency drops caused by abnormal temperatures.

[0138] In one possible implementation manner, the specific implementation of step S104 can be:

[0139] If the rotation direction is positive and the rotation speed is the maximum rotation speed of the heat dissipation motor, control the variable-diameter speed-regulating fan to rotate forward synchronously with the heat dissipation motor at the maximum operating speed, and the maximum operating speed is less than or equal to the operating speed corresponding to the preset noise threshold;

[0140] If, after the heat dissipation motor operates for the target time, the oil temperature is greater than the preset temperature threshold, control the piston rod assembly of the variable-diameter speed-regulating fan to extend outward to the maximum length according to the energization state, so that the fan blade diameter increases to the maximum diameter.

[0141] Wherein, the noise threshold is the decibel range standard set during design. By restricting the maximum speed of the fan, the generation of excessive noise due to the fan rotating too fast can be avoided, ensuring the comfort of the working environment.

[0142] In this embodiment, before the heat dissipation motor operates at the maximum speed, for the variable-diameter speed-regulating fan shown in Figures 2 to 6 , the controller always controls the 2D of solenoid valve 1 to be energized, or, for the variable-diameter speed-regulating fan shown in Figures 8 to 13 , the controller always controls the 3D of solenoid valve 1 not to be energized, so that the fan blades are in the retracted state and the fan blade diameter is in the minimum state.

[0143] When the heat dissipation motor rotates forward and operates at the maximum rotation speed for time T2, if the system detects that the oil temperature t1 > 60 °C, it indicates that the heat dissipation system needs to be further strengthened to reduce the oil temperature. Then the controller controls the 3D of solenoid valve 1 to be energized, so that the fan blades are in the extended state and the fan blade diameter increases until the fan blade diameter increases to the maximum, thereby improving the cooling efficiency of the fan.

[0144] If t1 < 60 °C after time T2, then maintain the current energization current of the 3D of solenoid valve 1, maintain the current fan blade diameter unchanged, and the system periodically scans and detects the oil temperature data and reports it to the controller.

[0145] It can be understood that by synchronizing the rotation speeds of the fan and the cooling motor, the maximum cooling efficiency is ensured. The cooperation between the fan and the cooling motor can not only ensure the stable heat dissipation of the system, but also reduce energy waste. By limiting the maximum operating speed of the fan below the noise threshold, excessive noise is avoided, ensuring that the device does not generate excessive noise pollution during operation and improving the comfort of the working environment.

[0146] The embodiment of the present application further provides a construction machinery, including the variable-diameter speed-regulating fan as described in the first aspect above and / or various possible ones in the first aspect. The implementation principle and technical effects are similar, and will not be elaborated here in this embodiment.

[0147] Figure 16 It is a schematic structural diagram of the controller provided by the embodiment of the present application. As Figure 16 shown, the controller 30 provided in this embodiment includes: at least one processor 302 and a memory 301.

[0148] Optionally, the controller 30 further includes a communication component 303. Among them, the processor 302, the memory 301, and the communication component 303 are connected through a bus 304.

[0149] In the specific implementation process, at least one processor 302 executes the computer-executable instructions stored in the memory 301, so that at least one processor 302 executes the above method.

[0150] For the specific implementation process of the processor 302, reference can be made to the above method embodiment. The implementation principle and technical effects are similar, and will not be elaborated here in this embodiment.

[0151] In the above embodiment, it should be understood that the processor may be a central processing unit (English: Central Processing Unit, abbreviated: CPU), or other general-purpose processors, digital signal processors (English: Digital Signal Processor, abbreviated: DSP), application-specific integrated circuits (English: Application Specific Integrated Circuit, abbreviated: ASIC), etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the invention can be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.

[0152] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (Non-volatile Memory, NVM), such as at least one disk memory.

[0153] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the buses in the accompanying drawings of this application are not limited to only one bus or one type of bus.

[0154] This application also provides a computer program product, including a computer program which, when executed by a processor, implements the above method.

[0155] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above method.

[0156] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic memory, a flash memory, a magnetic disk, or an optical disk. The readable storage medium can be any available medium accessible by a general-purpose or special-purpose computer.

[0157] An exemplary readable storage medium is coupled to the processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an Application Specific Integrated Circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in a device.

[0158] The division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of devices or units can be in an electrical, mechanical, or other form.

[0159] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0160] In addition, each functional unit in various embodiments of the present invention may be integrated in a processing unit, may exist separately physically for each unit, or two or more units may be integrated in one unit.

[0161] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0162] Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above method embodiments; and the foregoing storage medium includes: various media such as ROM, RAM, magnetic disks, or optical discs that can store program codes.

[0163] Finally, it should be noted that: After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily think of other implementation schemes of the present invention. The present invention aims to cover any variations, uses, or adaptive changes of the present invention. These variations, uses, or adaptive changes follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A variable-diameter speed-adjustable fan, characterized in that, Comprising: A fan blade assembly, a piston rod assembly, a base, and a rotary coupling, wherein: The fan blade assembly is screwed and connected to a piston rod within the piston rod assembly, and the fan blade assembly includes variable-diameter fan blades; The piston rod assembly is disposed inside the base, and the piston rod assembly is telescopic; The base is fixedly connected to the rotary coupling, and a first hydraulic fluid passage is provided inside the base, and the first hydraulic fluid passage communicates the piston rod assembly and the rotary coupling; The rotary coupling is connected to a cooling motor, and a second hydraulic fluid passage is provided inside the rotary coupling, and the first hydraulic fluid passage communicates with the second hydraulic fluid passage.

2. The variable-diameter speed-adjustable fan according to claim 1, wherein, A cylinder is provided in the base, and the number of cylinders is the same as the number of variable-diameter fan blades. A first oil port is provided at the bottom of the cylinder, and a second oil port is provided on an end face of the base. The first oil port is communicated with the second oil port through the first hydraulic fluid passage, and the first oil port is communicated with a rodless cavity within the piston rod assembly; The rotary coupling includes a rotary core and a housing. A third oil port is provided on the rotary core, and a fourth oil port is provided on the housing. The second oil port is communicated with the third oil port, and the third oil port is communicated with the fourth oil port through the second hydraulic fluid passage.

3. The variable-diameter speed-adjustable fan according to claim 2, wherein, A third hydraulic fluid passage is provided inside the base. A fifth oil port is provided on a side wall of the cylinder, and a sixth oil port is provided on an end face of the base. The fifth oil port is communicated with the sixth oil port through the third hydraulic fluid passage, and the fifth oil port is communicated with a rod cavity within the piston rod assembly; A fourth hydraulic fluid passage is provided inside the rotary coupling. A seventh oil port is provided on the rotary core, and an eighth oil port is provided on the housing. The sixth oil port is communicated with the seventh oil port, and the seventh oil port is communicated with the eighth oil port through the fourth hydraulic fluid passage.

4. The variable-diameter speed-regulating fan according to claim 2, wherein A spring is provided in the piston rod assembly. Two ends of the spring are respectively connected to a guide sleeve and a piston within the piston rod assembly. The spring is used to balance the centrifugal force when the variable-diameter fan rotates, and prevent the diameter of the variable-diameter fan blades from exceeding a preset diameter threshold.

5. The variable-diameter speed-regulating fan according to any one of claims 1 to 4, characterized in that A sealing ring and a support bearing are provided between the rotary core and the housing. The sealing ring is used to prevent hydraulic fluid leakage, and the support bearing is used to support the rotary core. The support bearing is fixedly connected to the housing.

6. The variable-diameter speed-regulating fan according to any one of claims 1 to 4, characterized in that The guide sleeve within the piston rod assembly is connected to the piston rod. The guide sleeve is fixedly disposed within a cylinder in the base, and an end face of the guide sleeve fits with an end face of the cylinder.

7. A heat dissipation system, characterized in that, Including the variable-diameter speed-regulating fan according to any one of claims 1 to 6, the system further includes: a hydraulic oil tank, a cooling pump, a solenoid valve, and a cooling motor, wherein: The hydraulic oil tank is used to store hydraulic oil, and the oil temperature of the hydraulic oil is a source of control signals for the variable-diameter regulating fan; The cooling pump is connected to the hydraulic oil tank and the solenoid valve. The cooling pump is used to pressurize the hydraulic fluid to obtain pressurized oil, and pump the pressurized oil to the solenoid valve. The pressurized oil is used to drive the cooling motor to rotate; The solenoid valve is used to regulate the flow rate of the pressurized oil and convey the pressurized oil to the cooling motor; The cooling motor is connected to the hydraulic oil tank and the solenoid valve and is used to drive the variable-diameter speed-regulating fan to rotate.

8. A method for controlling a heat dissipation system, characterized in that, The cooling system includes the variable-diameter speed-regulating fan according to any one of claims 1 to 6, and the control method includes: Obtaining the oil temperature of the current hydraulic oil; Controlling and adjusting the displacement of the cooling pump and the energization state of the solenoid valve according to the oil temperature; Controlling the rotation speed and rotation direction of the cooling motor according to the displacement and the energization state; Controlling the operating speed and the blade diameter of the variable-diameter speed-regulating fan according to the energization state, the rotation speed, and the rotation direction; 9. The heat dissipation system control method according to claim 8, wherein The controlling the operating speed and the blade diameter of the variable-diameter speed-regulating fan according to the energization state, the rotation speed, and the rotation direction includes: If the rotation direction is forward and the rotation speed is the maximum rotation speed of the cooling motor, controlling the variable-diameter speed-regulating fan to rotate forward synchronously with the cooling motor at the maximum operating speed, and the maximum operating speed is less than or equal to the operating speed corresponding to a preset noise threshold; If, after the cooling motor operates for a target time, the oil temperature is greater than a preset temperature threshold, controlling the piston rod assembly of the variable-diameter speed-regulating fan to extend outwards to the maximum length according to the energization state, so that the blade diameter increases to the maximum diameter.

10. An engineering machinery, characterized in that, Includes the variable-diameter speed-regulating fan according to any one of claims 1 to 6.

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