Cooling fan blade angle adjustment device, mechanical equipment

Abstract

This invention discloses a blade angle adjustment device and mechanical equipment for a cooling fan. The blade angle adjustment device uses a guide plate to radially and axially limit the slider, achieving synchronous rotation of the housing, guide plate, slider, and bearing outer ring with the drive shaft, while allowing the slider to move axially relative to the housing. Furthermore, the axial movement of the slider is converted into blade angle deflection through a sliding engagement between an annular groove on the slider and the blade shaft pin. Driven by a drive component, when the slider moves axially, it drives the blade shaft pin to rotate. Without changing the speed and direction of the drive shaft, not only can the deflection angle of the blade be adjusted, but reverse deflection can also be achieved, thus realizing the self-cleaning function of the radiator. Moreover, the overall structure of the device is compact, simple, and easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of cooling fan technology, and in particular to a fan blade angle adjustment device for a cooling fan. Furthermore, it also relates to a mechanical device employing the aforementioned fan blade angle adjustment device. Background Technology

[0002] In recent years, China's construction machinery industry has experienced rapid development, and high-end agricultural machinery has also accelerated its development under policy support. As a temperature regulation device for both construction and agricultural machinery, the cooling system plays an indispensable role, ensuring that the operating temperature of the engine and hydraulic system remains within a suitable range. Currently, the development direction of cooling technology mainly focuses on controlling the cooling fan to change the airflow through the radiator, thereby automatically and controllably controlling the cooling power of the cooling system to achieve constant temperature regulation of the engine and hydraulic system. Simultaneously, current development trends also require automatic cleaning functions for the radiator, which is particularly crucial in high-end agricultural machinery. There are two main types of existing cooling fan structures: one type has a fixed blade angle and the fan is rigidly connected directly to the engine's power output shaft. Neither the blade angle nor the fan speed can be automatically adjusted, resulting in significant limitations in heat dissipation. It cannot adapt to changes in the operating environment temperature to improve the radiator's heat dissipation capacity, nor does it have a reverse function to automatically clean the radiator. The other type has a fixed blade angle but an adjustable fan speed. In this type, the drive shaft is no longer rigidly connected to the engine but is directly driven by a hydraulic motor. The fan speed can be adjusted at any time. However, its hydraulic system has low transmission efficiency, high energy loss, and requires a hydraulic pump and motor, resulting in excessively high heat dissipation costs. Summary of the Invention

[0003] This invention provides a blade angle adjustment device and mechanical equipment for a cooling fan to solve the technical problem that existing cooling fans cannot achieve automatic blade angle adjustment.

[0004] According to one aspect of the present invention, a fan blade angle adjustment device for a cooling fan is provided, comprising a housing, fan blades, a fan blade shaft, a guide plate, a slider, a bearing, a drive shaft, and a drive component. One end of the drive shaft is connected to a power source, and the other end is fixedly connected to the housing. A plurality of fan blade shaft holes are spaced apart circumferentially on the housing, and a sliding bearing is disposed in each fan blade shaft hole. The fan blade shaft is sleeved on the sliding bearing. The fan blade is fixedly connected to the upper end of the fan blade shaft. The slider is mounted on the drive shaft via a bearing. The guide plate is fixedly connected to the housing. A through groove is provided along the axial direction. A portion of the slider is located in the through groove to limit the slider radially and circumferentially, so that the slider rotates synchronously with the housing and has the freedom of axial movement relative to the housing. A fan blade shaft pin is provided at the lower end of the fan blade shaft. An annular groove is provided on the slider along the circumferential direction. The fan blade shaft pin is inserted into the annular groove. The driving member is driven to drive the slider to move axially. When the slider moves axially, it drives the fan blade shaft pin to rotate, thereby automatically adjusting the angle of the fan blade.

[0005] Furthermore, it also includes a first wedge slider and a second wedge slider that are slidably coupled together. The first wedge slider is fixedly connected to the inner ring of the bearing. The driving member is connected to the second wedge slider. By controlling the driving member, the second wedge slider is driven to move up and down, so that the second wedge slider drives the first wedge slider, the bearing, and the slider to move axially together.

[0006] Furthermore, a compression spring is provided axially between the slider and the housing, and the initial state of the compression spring is a compressed state, which is used to provide a preload force to the slider in the axial direction to the right.

[0007] Furthermore, the slider is provided with a slider pin, and the housing is provided with a housing pin hole. The slider pin is inserted into the housing pin hole to guide the slider when it moves axially.

[0008] Furthermore, the driving component is a hydraulic cylinder, and the fan blade angle adjustment device also includes a hydraulic oil source, a pressure reducing valve, a cylinder extension solenoid valve, a cylinder retraction solenoid valve, a controller, and a hydraulic oil tank. The cylinder extension solenoid valve is located on the oil line connecting the hydraulic oil source and the rodless chamber of the hydraulic cylinder, and the cylinder retraction solenoid valve is located on the oil line connecting the hydraulic oil tank and the rodless chamber of the hydraulic cylinder. The controller is electrically connected to the cylinder extension and retraction solenoid valves. When the controller controls the cylinder extension solenoid valve to be on and the cylinder retraction solenoid valve to be off, the hydraulic cylinder extends, driving the slider to move axially to the left. When the controller controls the cylinder extension solenoid valve to be off and the cylinder retraction solenoid valve to be on, if the slider moves axially to the right, it drives the hydraulic cylinder to retract. When the controller controls both the cylinder extension and retraction solenoid valves to be off, the hydraulic cylinder maintains its current position.

[0009] Furthermore, it also includes a temperature sensor for monitoring the temperature of the heat dissipation system and a displacement sensor for monitoring the displacement of the hydraulic cylinder piston. Both the displacement sensor and the temperature sensor are electrically connected to the controller, which is used to realize closed-loop control and adjustment of the temperature of the heat dissipation system based on the detection results of the displacement sensor and the temperature sensor.

[0010] Furthermore, the controller controls the deflection angle of the fan blade shaft based on the following formula:

[0011]

[0012] Wherein, θ represents the deflection angle of the fan blade shaft, r represents the radius of the arc motion trajectory of the fan blade shaft pin, α represents the angle between the contact slope of the first and second wedge sliders and the axis of the transmission shaft, and S represents the extension displacement of the hydraulic cylinder piston rod.

[0013] Furthermore, when the temperature of the cooling system is detected to be greater than or equal to the high-temperature threshold, the controller energizes the hydraulic cylinder extension solenoid valve to extend the hydraulic cylinder piston rod until the extension displacement of the piston rod increases to a preset third extension displacement. At this time, the positive deflection angle of the fan blades increases to increase the cooling airflow. When the temperature of the cooling system is detected to be less than or equal to the low-temperature threshold, the controller energizes the hydraulic cylinder retraction solenoid valve to retract the hydraulic cylinder piston rod until the extension displacement of the piston rod decreases to a preset second extension displacement. At this time, the positive deflection angle of the fan blades decreases to reduce the cooling airflow.

[0014] Furthermore, when the radiator needs to be self-cleaned, the controller controls the hydraulic cylinder retraction solenoid valve to be energized and turned on, driving the hydraulic cylinder piston rod to retract until the extension displacement of the piston rod is reduced to a preset first extension displacement amount. Then, the controller controls the hydraulic cylinder extension solenoid valve and the hydraulic cylinder retraction solenoid valve to be de-energized and turned off for a preset time. At this time, the deflection angle of the fan blades is a negative deflection angle, and the fan blades change from suction to blowing air to automatically clean the radiator.

[0015] In addition, the present invention also provides a mechanical device that employs the fan blade angle adjustment device described above.

[0016] The present invention has the following effects:

[0017] The fan blade angle adjustment device of the present invention utilizes a guide plate to radially and axially limit the slider, achieving synchronous rotation of the housing, guide plate, slider, and bearing outer ring with the drive shaft, while allowing the slider to move axially relative to the housing. Furthermore, the axial movement of the slider is converted into angular deflection of the fan blade through a sliding engagement between the annular groove on the slider and the fan blade shaft pin. Driven by the drive component, when the slider moves axially, it drives the fan blade shaft pin to rotate. Without changing the speed and direction of the drive shaft, not only can the deflection angle of the fan blade be adjusted, but reverse deflection can also be achieved, thereby realizing the self-cleaning function of the radiator. Moreover, the overall structure of the device is compact, simple, and easy to maintain.

[0018] In addition, the mechanical device of the present invention also has the above-mentioned advantages.

[0019] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the cooling fan according to a preferred embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional structural schematic diagram of the blade angle adjustment device of the cooling fan according to a preferred embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the slider in a preferred embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the hydraulic control system of a preferred embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram illustrating the motion principle of the fan blade angle adjustment device in a preferred embodiment of the present invention for adjusting the fan blade angle.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Housing; 2. Fan blade; 3. Fan blade shaft; 4. Sliding bearing; 5. Guide plate; 6. Slider; 7. Bearing; 8. Drive shaft; 9. First wedge slider; 10. Second wedge slider; 11. Drive component; 12. Compression spring; 101. Housing pin hole; 301. Fan blade shaft pin; 601. Slider pin; 602. Annular groove; 603. Slider conductor; 604. Inner annular surface; 31. Hydraulic oil source; 32. Pressure reducing valve; 33. Cylinder extension solenoid valve; 34. Check valve; 35. Damping; 36. Displacement sensor; 37. Controller; 38. Temperature sensor; 39. Cylinder retraction solenoid valve; 40. Hydraulic oil tank; 901. Bearing mounting ring. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0029] Understandable, such as Figures 1 to 3As shown, a preferred embodiment of the present invention provides a fan blade angle adjustment device for a cooling fan, including a housing 1, a fan blade 2, a fan blade shaft 3, a guide plate 5, a slider 6, a bearing 7, a transmission shaft 8, and a drive component 11. One end of the transmission shaft 8 is connected to a power source, serving as the power source for the rotation of the cooling fan, and the other end is fixedly connected to the housing 1. Specifically, the right end of the transmission shaft 8 is connected to the power source, and the left end of the transmission shaft 8 is connected to the housing 1 by bolts. The housing 1 has multiple fan blade shaft holes spaced circumferentially, each fan blade shaft hole housing a sliding bearing 4. The fan blade shaft 3 is sleeved on the sliding bearing 4, and the fan blade 2 is fixedly connected to the upper end of the fan blade shaft 3. The fan blade 2 is bolted to the upper end of the fan blade shaft 3. The slider 6 is mounted on the drive shaft 8 via a bearing 7. Specifically, the inner wall of the right end of the slider 6 is provided with an inner ring surface 604. The outer ring of the bearing 7 is interference-fitted with the inner ring surface 604, and the inner ring of the bearing 7 is movably mounted on the drive shaft 8. The slider 6 and the bearing 7 can move axially relative to the drive shaft 8. The guide plate 5 is fixedly connected to the housing 1. A through groove is provided on the guide plate 5 along the axial direction. A portion of the slider 6 is located in the through groove to limit the slider 6 radially and circumferentially, so that the slider 6 rotates synchronously with the housing 1 and has the freedom of axial movement relative to the housing 1. Specifically, a slider conductor 603 is provided radially on the right end of the slider 6. The slider conductor 603 is embedded in the through groove on the guide plate 5. When the guide plate 5 and the housing 1 rotate together under the drive of the drive shaft 8, the guide plate 5 drives the slider 6 to rotate synchronously. The lower end of the fan blade shaft 3 is eccentrically provided with a fan blade shaft pin 301. The slider 6 has an annular groove 602 along its circumferential direction. The fan blade shaft pin 301 is inserted into the annular groove 602. When the slider 6 moves axially, it drives the fan blade shaft pin 301 to rotate, thereby driving the fan blade shaft 3 and fan blade 2 to rotate, thus adjusting the angle of the fan blade 2. The driving component 11 is driven by the slider 6 and is used to drive the slider 6 to move axially. When the slider 6 moves axially, it drives the fan blade shaft pin 301 to rotate, thereby adjusting the deflection angle of the fan blade 2. It can be understood that when the slider 6 moves axially to the left, it drives the fan blade 2 to rotate clockwise; and when the slider 6 moves axially to the right, it drives the fan blade 2 to rotate counterclockwise. This not only adjusts the deflection angle of the fan blade 2 but also achieves reverse deflection, thus realizing the self-cleaning function of the radiator. The driving component 11 can be a linear drive mechanism such as a hydraulic cylinder, an electric push rod, or a linear motor, with a hydraulic cylinder being preferred.

[0030] It is understood that the fan blade angle adjustment device of this embodiment uses the guide plate 5 to radially and axially limit the slider 6, which not only enables the outer ring of the housing 1, guide plate 5, slider 6, and bearing 7 to rotate synchronously with the transmission shaft 8, but also allows the slider 6 to move axially relative to the housing 1. Furthermore, through the sliding engagement of the annular groove 602 on the slider 6 with the fan blade shaft pin 301, the axial movement of the slider 6 is converted into the angle deflection of the fan blade 2. Driven by the drive component 11, when the slider 6 moves axially, it can drive the fan blade shaft pin 301 to rotate. Without changing the speed and direction of the transmission shaft 8, not only can the deflection angle of the fan blade 2 be adjusted, but reverse deflection can also be achieved, thereby realizing the self-cleaning function of the radiator. Moreover, the overall structure of the device is compact and simple, and easy to maintain.

[0031] Optionally, the fan blade angle adjustment device further includes a first wedge slider 9 and a second wedge slider 10 that are slidably engaged. The first wedge slider 9 is fixedly connected to the inner ring of the bearing 7, and the driving member 11 is connected to the second wedge slider 10. By controlling the driving member 11 to drive the second wedge slider 10 to move up and down, the second wedge slider 10 drives the first wedge slider 9, the bearing 7, and the slider 6 to move axially together. It can be understood that by using the slidable engagement of the two wedge sliders, the up-and-down movement of the second wedge slider 10 is converted into the left-and-right movement of the first wedge slider 9. This allows the driving member 11 to be positioned in the vertical direction on the same side of the transmission shaft 8, without occupying the axial space of the transmission shaft 8, resulting in a more compact structural layout that better suits mechanical equipment with high compactness requirements. Of course, in other embodiments of the present invention, the driving member 11 can also be arranged in the axial direction of the transmission shaft 8 to directly drive the slider 6 and the bearing 7 to move axially. However, this would occupy axial installation space and is not conducive to structural compactness.

[0032] Preferably, on the two inclined surfaces of the first wedge slider 9 and the second wedge slider 10 that cooperate with each other, one inclined surface has a groove and the other inclined surface has a boss. The boss slides through the groove, which can guide the two wedge sliders when they slide together, thus improving the reliability of the sliding engagement. In addition, a bearing mounting ring 901 is provided at the upper left end of the first wedge slider 9. The bearing mounting ring 901 is movably mounted on the transmission shaft 8, for example, with a clearance fit. The inner ring of the bearing 7 is fixedly mounted on the outer ring surface of the bearing mounting ring 901, for example, with an interference fit.

[0033] Optionally, a compression spring 12 is axially arranged between the slider 6 and the housing 1, and the initial state of the compression spring 12 is compressed, used to provide a preload force to the slider 6 in the axial direction to the right. The left end of the compression spring 12 presses against the flange at the left end of the drive shaft 8, and the right end of the compression spring 12 presses against the slider 6. The compression spring 12 can be sleeved on the drive shaft 8, or it can be left unsleeved. When the driving member 11 drives the slider 6 to move axially to the left, it further compresses the compression spring 12. When the slider 6 needs to move axially to the right, it can be driven to move axially to the right only under the restoring force of the compression spring 12. Of course, in other embodiments of the present invention, the compression spring 12 can be omitted, and the slider 6 can be driven to move axially left and right entirely by the driving member 11.

[0034] Optionally, the slider 6 is provided with a slider pin 601, and the housing 1 is provided with a housing pin hole 101. The slider pin 601 is inserted into the housing pin hole 101 to guide the slider 6 when it moves axially, thereby enhancing the stability of the slider 6.

[0035] It is understood that, in one embodiment of the present invention, the working process of the fan blade angle adjustment device is as follows: when the drive shaft 8 rotates, the housing 1, fan blade 2, fan blade shaft 3, sliding bearing 4, guide plate 5, slider 6, outer ring of bearing 7 and compression spring 12 are all driven by the drive shaft 8 to rotate synchronously, while the inner ring of bearing 7, first wedge slider 9, second wedge slider 10 and hydraulic cylinder do not rotate with the above components. When the fan is rotating, when the hydraulic cylinder receives pressurized oil, the piston rod extends, pushing the second wedge slider 10 to move vertically upward, causing the first wedge slider 9 to move horizontally to the left. The first wedge slider 9 transmits motion to the slider 6 through the bearing 7, causing the slider 6 to move horizontally to the left relative to the housing 1. The annular groove 602 of the slider 6 pushes the fan blade shaft pin 301 to the left, causing the fan blade 2 to rotate in the positive deflection direction. When the hydraulic cylinder stops receiving pressurized oil, the preload generated by the compression spring 12 is applied to the slider 6, fixing it in its current position. At this time, the deflection angle of the fan blade 2 is also fixed in its current position. When the hydraulic cylinder returns oil... When the slide is in motion, under the preload force generated by the compression spring 12, the slider 6 moves to the right relative to the housing 1. The annular groove 602 of the slider 6 pushes the fan blade shaft pin 301 to the right, so the deflection angle of the fan blade 2 rotates in the negative deflection direction. The slider 6 transmits the rightward movement to the first wedge slider 9 through the bearing 7. The first wedge slider 9 then pushes the second wedge slider 10 to slide, causing the second wedge slider 10 to move vertically downward. The piston rod of the hydraulic cylinder moves downward accordingly. When the return oil of the hydraulic cylinder stops, the piston of the hydraulic cylinder no longer moves downward. The preload force generated by the compression spring 12 is applied to the slider 6 to fix it in the current position. At this time, the deflection angle of the fan blade 2 is also fixed in the current position.

[0036] It is understood that, preferably, the driving component 11 is a hydraulic cylinder. For example... Figure 4 As shown, the fan blade angle adjustment device also includes a hydraulic control system, specifically including a hydraulic oil source 31, a pressure reducing valve 32, a cylinder extension solenoid valve 33, a cylinder retraction solenoid valve 39, a controller 37, and a hydraulic oil tank 40. The cylinder extension solenoid valve 33 is installed in the oil line connecting the hydraulic oil source 31 and the rodless chamber of the hydraulic cylinder, and the cylinder retraction solenoid valve 39 is installed in the oil line connecting the hydraulic oil tank 40 and the rodless chamber of the hydraulic cylinder. The controller 37 is electrically connected to the cylinder extension solenoid valve 33 and the cylinder retraction solenoid valve 39. When the controller 37 controls the cylinder extension solenoid valve 33 to be open and the cylinder retraction solenoid valve 39 to be closed, the hydraulic cylinder extends and drives the slider 6 to move to the left along the axial direction. When the controller 37 controls the cylinder extension solenoid valve 33 to be closed and the cylinder retraction solenoid valve 39 to be open, if the slider 6 moves to the right along the axial direction, the hydraulic cylinder is driven to retract. When the controller 37 controls both the cylinder extension solenoid valve 33 and the cylinder retraction solenoid valve 39 to be closed, the hydraulic cylinder maintains its current position.

[0037] Optionally, the fan blade angle adjustment device further includes a pressure reducing valve 32 disposed between the hydraulic oil source 31 and the cylinder extension solenoid valve 33, for providing pressurized oil at a certain temperature to the hydraulic cylinder to increase the stability of the fan blade 2 deflection angle control. Additionally, a one-way valve 34 is disposed between the cylinder extension solenoid valve 33 and the rodless chamber of the hydraulic cylinder to prevent oil backflow and ensure the hydraulic cylinder maintains a stable position. Furthermore, a damping valve 35 is disposed between the one-way valve 34 and the rodless chamber of the hydraulic cylinder to control the oil inlet speed of the hydraulic cylinder and enhance the smoothness of the fan blade 2's movement during angle adjustment.

[0038] Optionally, the fan blade angle adjustment device further includes a temperature sensor 38 for monitoring the temperature of the cooling system and a displacement sensor 36 for monitoring the displacement of the hydraulic cylinder piston rod. Both the displacement sensor 36 and the temperature sensor 38 are electrically connected to the controller 37. The controller 37 is used to achieve closed-loop control and adjustment of the cooling system temperature based on the detection results of the displacement sensor 36 and the temperature sensor 38. It can be understood that this invention can accurately adjust the extension and retraction of the hydraulic cylinder in a closed loop by monitoring the cooling system temperature and the displacement of the hydraulic cylinder piston rod, so that the fan blade 2 matches the optimal power demand of the cooling system at the most suitable angle, improving the power system utilization rate and reducing energy consumption.

[0039] It is understood that, in one embodiment of the present invention, the hydraulic control principle of the fan blade angle adjustment device is as follows: When the hydraulic cylinder needs to extend, the controller 37 sends a command signal to the cylinder extension solenoid valve 33. After the cylinder extension solenoid valve 33 is energized, the valve core changes to the left position. At this time, the pressure oil output from the hydraulic oil source 31 passes through the pressure reducing valve 32, then through the cylinder extension solenoid valve 33, and opens the check valve 34. The pressure oil then passes through the damper 35 and enters the rodless chamber of the hydraulic cylinder, pushing the piston rod of the hydraulic cylinder to extend. When the hydraulic cylinder needs to be held in a certain position, the controller 37 does not send command signals to the cylinder extension solenoid valve 33 and the cylinder retraction solenoid valve 39. At this time, the hydraulic system's oil inlet is cut off by the cylinder extension solenoid valve 33, and the oil return is cut off by the cylinder retraction solenoid valve 39. The hydraulic oil in the rodless chamber of the hydraulic cylinder is blocked by the check valve 34 and the cylinder retraction solenoid valve 39, preventing flow. The piston rod of the hydraulic cylinder is held in its current position. When the hydraulic cylinder needs to retract, the controller 37 sends a command signal to the cylinder retraction solenoid valve 39. After the cylinder retraction solenoid valve 39 is energized, the valve core changes to the upper function. At this time, the rodless chamber of the hydraulic cylinder is connected to the hydraulic oil tank 40. The hydraulic oil in the rodless chamber of the hydraulic cylinder returns to the hydraulic oil tank 40 through the damper 35 and the cylinder retraction solenoid valve 39. Under the preload of the compression spring 12, the piston rod of the hydraulic cylinder retracts.

[0040] It can be understood that the controller 37 controls the deflection angle of the fan blade shaft 3 based on the following formula:

[0041]

[0042] Wherein, θ represents the deflection angle of the fan blade shaft 3, r represents the radius of the arc motion trajectory of the fan blade shaft pin 301, α represents the angle between the contact slope of the first wedge slider 9 and the second wedge slider 10 and the axis of the transmission shaft 8, and S represents the extension displacement of the hydraulic cylinder piston rod.

[0043] Specifically, this invention also proposes a control relationship between the deflection angle of the fan blade 2 and the displacement of the hydraulic cylinder piston rod, such as... Figure 5 As shown, O1 represents the motion reference coordinate system of the two wedge-shaped sliders, with x1 as the horizontal axis and y1 as the vertical axis; O2 represents the motion reference coordinate system of the fan blade shaft pin 301, with x2 as the horizontal axis and y2 as the vertical axis; S represents the extension displacement of the hydraulic cylinder piston rod; α represents the angle formed by the contact slope of the first wedge-shaped slider 9 and the second wedge-shaped slider 10 and the axial direction of the transmission shaft 8; ①, ②, and ③ respectively represent the zero position, positive deflection angle, and negative deflection angle of the fan blade shaft pin 301 in the motion trajectory. The deflection angle position; Δx2 represents the horizontal distance between the fan blade shaft pin 301 and the coordinate axis y2; r represents the radius of the arc motion trajectory of the fan blade shaft pin 301; θ1 represents the complementary angle of the maximum positive deflection angle of the fan blade shaft 3, that is, the maximum positive deflection angle of the fan blade shaft 3 is (90°-θ1); θ2 represents the complementary angle of the maximum negative deflection angle of the fan blade shaft 3, that is, the maximum negative deflection angle of the fan blade shaft 3 is (90°-θ2); θ represents the deflection angle of the fan blade shaft 3, θ∈[-90°+θ2, 90°-θ1].

[0044] According to the above definition, in coordinate system O1, the displacement change Δx1 of the first wedge slider 9 and the displacement change Δy1 of the second wedge slider 10 have the following relationship: tanα=Δy1 / Δx1, and Δy1=S, then Δx1=S / tanα.

[0045] In coordinate system O2, the origin O2 is the center point of the fan blade shaft 3. The fan blade shaft pin 301 moves on a circular arc trajectory with O2 as the origin and radius r. The axial displacement change of the fan blade shaft pin 301 is equal to the axial displacement change of the first wedge slider 9, i.e.: Δx2=Δx1=S / tanα. Since the trigonometric function relationship between Δx2 and r is: sinθ=Δx2 / r, the governing equation for the deflection angle θ of the fan blade shaft 3 is: Where r and α are constants, therefore, within the range of θ∈[-90°+θ2, 90°-θ1], the deflection angle θ of the fan blade shaft 3 is a function equation relating to the extension displacement S of the hydraulic cylinder piston rod. It can be understood that when S=0, θ=0, indicating that the deflection angle of the fan blade shaft 3 is zero, and this zero position is calibrated as the initial state by the electrical program when the hydraulic cylinder piston rod extends to a certain position; when S>0, θ∈(0°, 90°-θ1], indicating that the deflection angle of the fan blade shaft 3 is positive, realizing the normal heat dissipation and air intake of the fan blade 2 and the adjustment of the fan blade angle; when S<0, θ∈[-90°-θ2, 0°), indicating that the deflection angle of the fan blade shaft 3 is negative, performing negative angle adjustment on the fan blade 2 to achieve the back-blowing function of the radiator.

[0046] It is understood that the present invention, through the aforementioned proposed hydraulic control system for adjusting the blade angle, fully satisfies the closed-loop control function of automatically adjusting the blade angle of the fan blade according to the temperature of the heat dissipation system, and simply and effectively solves the difficulty of configuring and installing a blade angle sensor inside the rotating fan.

[0047] It can be understood that the automatic temperature adjustment control logic of the present invention is specifically as follows:

[0048] When the temperature T of the cooling system is detected to be greater than or equal to the high temperature threshold T2, the controller 37 controls the hydraulic cylinder extension solenoid valve 33 to be energized and conduct, and the hydraulic cylinder piston rod extends until the extension displacement S of the piston rod increases to a preset third extension displacement S3. The third extension displacement S3 represents the extension displacement of the hydraulic cylinder piston rod corresponding to the preset increase in cooling airflow in the control program. At this time, the positive deflection angle of the fan blade 2 increases to increase the cooling airflow, thereby reducing the temperature of the cooling system. When the temperature T of the cooling system is detected to be less than or equal to the low temperature threshold T1, the controller 37 controls the hydraulic cylinder retraction solenoid valve 39 to be energized and conduct, driving the hydraulic cylinder piston rod to retract until the extension displacement S of the piston rod decreases to a preset second extension displacement S2. The second extension displacement S2 represents the extension displacement of the hydraulic cylinder piston rod corresponding to the preset decrease in cooling airflow in the control program. At this time, the positive deflection angle of the fan blade 2 decreases to reduce the cooling airflow, thereby increasing the temperature of the cooling system.

[0049] When the radiator needs to be self-cleaned, for example, when the controller 37 manually executes the radiator cleaning command or periodically executes the radiator cleaning command automatically, the controller 37 controls the hydraulic cylinder retraction solenoid valve 39 to be energized and conduct, driving the hydraulic cylinder piston rod to retract until the extension displacement S of the piston rod is less than or equal to the preset first extension displacement S1. The first extension displacement S1 represents the extension displacement of the hydraulic cylinder piston rod in the radiator reverse blowing self-cleaning state in the control program. Then, the controller controls the hydraulic cylinder extension solenoid valve 33 and the hydraulic cylinder retraction solenoid valve 39 to be de-energized and maintained for a preset time t. At this time, the angle of the fan blade 2 is reversed to blow air, thereby automatically cleaning the radiator. In addition, after the self-cleaning time t is reached, the controller 37 controls the hydraulic cylinder extension solenoid valve 33 to be energized and turned on, so that the hydraulic cylinder is connected to the oil supply and the hydraulic cylinder piston rod extends until the extension displacement S of the piston rod is greater than or equal to the preset initial extension displacement S0. The initial extension displacement S0 represents the extension displacement of the hydraulic cylinder piston rod preset in the control program for the initialization of the heat dissipation system. At this point, the radiator self-cleaning program is completed.

[0050] In addition, another embodiment of the present invention provides a mechanical device, preferably employing the blade angle adjustment device described above. The mechanical device is preferably engineering machinery or agricultural machinery.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fan blade angle adjustment device for a cooling fan, characterized in that, The device includes a housing (1), fan blades (2), fan blade shafts (3), guide plates (5), sliders (6), bearings (7), transmission shafts (8), and a drive component (11). One end of the transmission shaft (8) is connected to a power source, and the other end is fixedly connected to the housing (1). The housing (1) has multiple fan blade shaft holes spaced circumferentially, and each fan blade shaft hole contains a sliding bearing (4). The fan blade shaft (3) is fitted onto the sliding bearing (4). The fan blades (2) are fixedly connected to the upper end of the fan blade shaft (3). The slider (6) is mounted on the transmission shaft (8) via bearings (7). The guide plate (5) is fixedly connected to the housing (1). The guide plate (5) has through grooves along its axial direction. A portion of the block (6) is located in the through groove to limit the slider (6) radially and circumferentially, so that the slider (6) rotates synchronously with the housing (1) and has the freedom to move axially relative to the housing (1). The lower end of the fan blade shaft (3) is provided with a fan blade shaft pin (301). The slider (6) is provided with an annular groove (602) along the circumferential direction. The fan blade shaft pin (301) is inserted into the annular groove (602). The driving member (11) is driven to connect with the slider (6) and is used to drive the slider (6) to move axially. When the slider (6) moves axially, it drives the fan blade shaft pin (301) to rotate, thereby automatically adjusting the angle of the fan blade (2). The driving component (11) is a hydraulic cylinder. The fan blade angle adjustment device also includes a hydraulic oil source (31), a pressure reducing valve (32), a cylinder extension solenoid valve (33), a cylinder retraction solenoid valve (39), a controller (37), and a hydraulic oil tank (40). The cylinder extension solenoid valve (33) is located on the oil line connecting the hydraulic oil source (31) and the rodless chamber of the hydraulic cylinder. The cylinder retraction solenoid valve (39) is located on the oil line connecting the hydraulic oil tank (40) and the rodless chamber of the hydraulic cylinder. The controller (37) is electrically connected to the cylinder extension solenoid valve (33) and the cylinder retraction solenoid valve (39). When the controller... (37) When the solenoid valve (33) for extending the cylinder is turned on and the solenoid valve (39) for retracting the cylinder is turned off, the hydraulic cylinder extends and drives the slider (6) to move to the left along the axial direction. When the controller (37) controls the solenoid valve (33) for extending the cylinder to be turned off and the solenoid valve (39) for retracting the cylinder to be turned on, if the slider (6) moves to the right along the axial direction, the hydraulic cylinder is driven to retract. When the controller (37) controls both the solenoid valve (33) for extending the cylinder and the solenoid valve (39) for retracting the cylinder to be turned off, the hydraulic cylinder maintains its current position. The controller (37) controls the deflection angle of the fan blade shaft (3) based on the following formula: ； in, The deflection angle of the fan blade shaft (3) is represented by r, the radius of the arc motion trajectory of the fan blade shaft pin (301) is represented by α, the angle between the contact slope of the first wedge slider (9) and the second wedge slider (10) and the axis of the transmission shaft (8) is represented by S, and the extension displacement of the hydraulic cylinder piston rod is represented by S.

2. The fan blade angle adjustment device of the cooling fan as described in claim 1, characterized in that, It also includes a first wedge slider (9) and a second wedge slider (10) that are slidably connected. The first wedge slider (9) is fixedly connected to the inner ring of the bearing (7). The driving member (11) is connected to the second wedge slider (10). By controlling the driving member (11) to drive the second wedge slider (10) to move up and down, the second wedge slider (10) drives the first wedge slider (9), the bearing (7), and the slider (6) to move axially together.

3. The fan blade angle adjustment device of the cooling fan as described in claim 1, characterized in that, A compression spring (12) is provided axially between the slider (6) and the housing (1), and the initial state of the compression spring (12) is a compressed state, which is used to provide a preload force to the slider (6) in the rightward direction.

4. The fan blade angle adjustment device for a cooling fan as described in claim 1, characterized in that, The slider (6) is provided with a slider pin (601), and the housing (1) is provided with a housing pin hole (101). The slider pin (601) is inserted into the housing pin hole (101) and is used to guide the slider (6) when it moves axially.

5. The fan blade angle adjustment device as described in claim 1, characterized in that, It also includes a temperature sensor (38) for monitoring the temperature of the heat dissipation system and a displacement sensor (36) for monitoring the displacement of the hydraulic cylinder piston. Both the displacement sensor (36) and the temperature sensor (38) are electrically connected to the controller (37). The controller (37) is used to realize closed-loop control and regulation of the temperature of the heat dissipation system based on the detection results of the displacement sensor (36) and the temperature sensor (38).

6. The fan blade angle adjustment device as described in claim 5, characterized in that, When the temperature of the heat dissipation system is detected to be greater than or equal to the high temperature threshold, the controller (37) controls the hydraulic cylinder extension solenoid valve (33) to be energized and conduct, and the hydraulic cylinder piston rod extends until the extension displacement of the piston rod increases to the preset third extension displacement. At this time, the positive deflection angle of the fan blade (2) increases to increase the heat dissipation air volume. When the temperature of the heat dissipation system is detected to be less than or equal to the low temperature threshold, the controller (37) controls the hydraulic cylinder retraction solenoid valve (39) to be energized and conduct, and drives the hydraulic cylinder piston rod to retract until the extension displacement of the piston rod decreases to the preset second extension displacement. At this time, the positive deflection angle of the fan blade (2) decreases to reduce the heat dissipation air volume.

7. The fan blade angle adjustment device for a cooling fan as described in claim 5, characterized in that, When the radiator needs to be self-cleaned, the controller (37) controls the hydraulic cylinder retraction solenoid valve (39) to be energized and conduct, driving the hydraulic cylinder piston rod to retract until the extension displacement of the piston rod is reduced to the preset first extension displacement amount. Then, the controller controls the hydraulic cylinder extension solenoid valve (33) and the hydraulic cylinder retraction solenoid valve (39) to be de-energized and cut off for a preset time. At this time, the deflection angle of the fan blade (2) is a negative deflection angle, and the fan blade changes from suction to blowing air to automatically clean the radiator.

8. A mechanical device, characterized in that, The fan blade angle adjustment device as described in any one of claims 1 to 7 is adopted.

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