Three-angle reversing fan device and engine comprising same

Abstract

The invention relates to the technical field of engine cooling fans, and discloses a three-angle reversing fan device and an engine comprising the same, the three-angle reversing fan device comprises an oil feeder component, a fan blade shaft component, a fan blade seat body, a connecting disc, a first reset spring, an oil cylinder, a piston, a first sealing ring, a second sealing ring and a middle angle control component; a first sealing ring is arranged between the oil cylinder and the piston, a second sealing ring is arranged between the oil cylinder and the connecting disc, the oil cylinder, the piston and the connecting disc jointly form a sealed pressure space, a first reset spring is arranged between the oil cylinder and the piston, and the middle angle control component is installed on the piston, located on the outer ring of the first reset spring and located at the oil inlet end close to the piston. According to the three-angle reversing fan device, the middle angle control component is arranged under the condition that the axial size of an existing reversing fan body is not increased, the hydraulic pressure space can be adjusted in the three-angle reversing fan device, and the boundary size and the vehicle pressure of the three-angle reversing fan device can be better matched.

Description

Technical Field

[0001] The invention relates to the technical field of engine cooling fans, and in particular to a three-angle reversing fan device and an engine comprising the device. Background Art

[0002] The heat dissipation of the engine cooling system is mainly achieved by directly or indirectly driving the cooling fan through the engine crankshaft to remove the heat. Conventional fans can only suck or blow air, and mainly realize the heat dissipation function of the engine cooling water tank. At present, agricultural machinery and some special work vehicles are easily affected by the external environment when working. For example, when the fan is working for heat dissipation, long-term air suction will cause objects in the environment to be adsorbed on the water tank body, reducing the heat dissipation efficiency of the cooling fan to the water tank. In severe cases, it may cause the engine to overheat or even stop working, and it is also difficult to shut down and clean up; In order to solve this problem, a patent with a patent publication number of CN 219345043 U discloses a three-angle reversing fan device, including a seat body, a connecting plate and an oil cylinder body, wherein the connecting plate and the oil cylinder body are respectively arranged at two ends of the seat body, and a cavity is formed between the three. A first-order return spring and a second-order return spring are arranged in the cavity, wherein the first-order return spring is arranged in an annular groove of the piston, and the second-order return spring is sleeved on a guide sleeve, wherein the guide sleeve can slide along a guide column, and the guide column is installed at the center of the connecting plate. The device has the following problems: 1. The device needs to arrange guide columns and guide sleeves in the axial space of the body, which further increases the axial size of the reversing fan device body. The axial size of the known reversing fan device has increased compared with the traditional fan blades. If the axial size of the reversing fan device body is further increased, the three-angle reversing fan device will not be able to be adapted for use on existing vehicles. 2. The device cannot adapt to different hydraulic pressures. Some vehicles still need to use step-down or step-up equipment for conversion, which increases the cost of supporting use and has a complex structure. 3. The guide column of the device is installed at the center position of the connecting disk, and the fixing screws of the connecting disk and the seat body are installed at the maximum outer diameter position of the connecting disk. During the reversing work, the axial movement and resetting process of the guide sleeve requires a relatively large bearing capacity at the center position of the connecting disk, otherwise the center position of the connecting disk is prone to deformation or damage; the guide column and the connecting disk of this device can only be fixed by one bolt, and the contact area between the guide column and the connecting disk is small. The fixing screws of the guide column and the connecting disk are also prone to loosening during the reversing work, resulting in functional failure. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a three-angle reversing fan device and an engine cooling system including the device, in which intermediate angle control components are arranged without increasing the axial size of the existing reversing fan body, so that the reversing fan can be better matched on the size boundary.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: In the first aspect, the present invention discloses a three-angle reversing fan device, including an oil inlet component, a blade shaft component, a blade seat body, a connecting plate, a first return spring, a cylinder, a piston and an intermediate angle control component. The piston is fixedly connected to one side of the blade seat body, the connecting plate is fixedly connected to the other side of the blade seat body, the blade shaft component is evenly installed on the circumference of the blade seat body, a first sealing ring is arranged between the cylinder and the piston, a second sealing ring is arranged between the cylinder and the connecting plate, the cylinder, the piston and the connecting plate jointly form a sealed pressure space, a first return spring is arranged between the cylinder and the piston, and the intermediate angle control component is installed on the piston, located on the outer ring of the first return spring, and located close to the oil inlet end of the piston.

[0005] As a further technical solution, the piston is a two-layer annular piston body structure, an annular installation cavity is formed between the inner annular body and the outer annular body, and the intermediate angle control component and the first return spring are arranged in the annular installation cavity of the piston.

[0006] As a further technical solution, the intermediate angle control component includes a fixed block, a movable block and a second return spring. The second return spring is compressibly installed between the movable block and the piston. The movable block is limited by the fixed block, and the fixed block is fixedly connected to the piston.

[0007] As a further technical solution, the fixed block is an annular block, and the movable block is an annular block; the second return spring is a spring with a diameter larger than that of the first return spring.

[0008] As a further technical solution, the fixed block is an arc-shaped block, and the movable block is also an arc-shaped block; the second return spring is a spring with a smaller diameter than the first return spring.

[0009] Furthermore, in order to match vehicles with different input pressures, the second sealing ring is arranged between the oil cylinder and the connecting plate, and the matching position of the oil cylinder and the connecting plate where the second sealing ring is located is adjustable. By adjusting the diameter of the second sealing ring and the first sealing ring, the axial pressure after the oil pressure intensity conversion is calculated according to the diameter difference, which can match the use requirements of most vehicles in the market without the need for additional pressure-increasing or pressure-reducing equipment conversion.

[0010] Furthermore, when the input pressure is normal pressure, the second sealing ring is arranged at a matching diameter position between the oil cylinder and the connecting plate.

[0011] Furthermore, when the input pressure is relatively small, the second sealing ring is arranged at the maximum matching diameter position between the oil cylinder and the connecting plate.

[0012] Furthermore, when the input pressure is relatively large, the second sealing ring is arranged at the position of the minimum matching diameter between the oil cylinder and the connecting plate.

[0013] The working principle of the present invention is as follows: When no oil is supplied, the preload force of the first return spring acts on the piston and the oil cylinder. The oil cylinder can be positioned immobile under the limit of the connecting plate, and the fan shaft is in the first angle state.

[0014] The oil inlet component is installed on the piston, and the oil inlet part is connected with the sealed pressure space. When the oil inlet component inputs the first pressure, the cylinder overcomes the elastic force of the first return spring and moves axially toward the piston. When the cylinder contacts the movable block, the remaining force after the input first pressure overcomes the first return spring is less than the preload force of the second return spring. At this time, the movable block limits the axial movement of the cylinder, and the fan shaft reaches the middle angle state.

[0015] When the oil inlet component inputs the second pressure, the oil cylinder overcomes the elastic force of the first return spring and moves axially toward the piston. When the oil cylinder contacts the movable block, the remaining force after the second pressure input overcomes the first return spring is still greater than the preload force of the second return spring. At this time, the oil cylinder continues to compress the second return spring and the first return spring through the movable block under the action of the second pressure input. The movable block contacts the piston end face and limits the position. The fan shaft reaches the second angle state at this time. The movable block contacts the piston end face and limits the position. The closer the diameter of the contact surface is to the installation diameter of the piston and the fan blade seat body, the more conducive it is to the force on the piston, the more reliable the structure is, and the use requirements can be met within a limited wall thickness range.

[0016] One or more technical solutions provided in the embodiments of the present invention have the following main technical effects or advantages: The intermediate angle control component in the present invention is installed on the piston, located on the outer ring of the first return spring, and located near the oil inlet end of the piston, so that the intermediate angle control component is arranged without increasing the axial size of the existing reversing fan body, so that the reversing fan can be better matched on the size boundary. That is, when the boundary size conditions are not increased, the intermediate angle control component is arranged in the conventional reversing fan body, and the intermediate angle can be set to any angle between the first angle and the second angle, which can be used for the small air volume suction, exhaust or zero angle of the fan blade, so that the vehicle can achieve the functions of reducing power, reducing noise or rapid temperature rise; The three-angle reversing fan device proposed in the present invention can also adjust the diameter of the hydraulic pressure space. By adjusting the position and size of the diameters of the second sealing ring and the first sealing ring, the required axial pressure after the oil pressure conversion is calculated according to the diameter difference, which can match the usage requirements of most vehicles on the market without the need for additional boost or pressure reduction equipment for conversion.

[0017] In the present invention, the guide post and the guide sleeve are removed. Since the intermediate angle control component of the invention is used for control, the center position of the connecting disk is not easily deformed or damaged, and further, there is no problem that the fixing screws of the guide post and the connecting disk are easily loosened during the reversing operation, resulting in functional failure. In the present invention, the intermediate angle control component is located on the piston body close to the second fixing screw, and the second fixing screw between the piston and the fan blade seat body is located at the outermost diameter position of the piston. The fixed contact area between the intermediate angle control component and the piston is large, and multiple first fixing screws can be arranged on the circumference as needed, so the fixing structure is more reliable. During the reversing process, the intermediate angle control component is close to the second fixing screw between the piston and the fan blade seat body due to the force position, so this device is beneficial to improving the bearing capacity of the piston and avoiding deformation or damage of the piston due to the reversing operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0019] Figure 1 It is a schematic diagram of the structure in the first angle state of the three-angle reversing fan device embodiment 1 disclosed in the present invention; Figure 2 It is a schematic diagram of the structure of the intermediate angle state of the three-angle reversing fan device embodiment 1 disclosed in the present invention; Figure 3 It is a schematic diagram of the structure of the second angle state of the three-angle reversing fan device embodiment 1 disclosed in the present invention; Figure 4 It is a schematic diagram of the structure of the fan blade shaft component described in Example 1 of the three-angle reversing fan device disclosed in the present invention; Figure 5 It is a structural schematic diagram of Embodiment 2 of the three-angle reversing fan device disclosed in the present invention; Figure 6 It is a structural schematic diagram of Embodiment 3 of the three-angle reversing fan device disclosed in the present invention; Figure 7 It is a structural schematic diagram of Embodiment 4 of the three-angle reversing fan device disclosed in the present invention; Among them: 1. Fan blade shaft component; 2. Fan blade seat body; 3. Piston; 4. Fixed block; 5. Movable block; 6. Oil inlet component; 7. First return spring; 8. Second return spring; 9. Connecting plate; 10. Oil cylinder; 11. First sealing ring; 12. Second sealing ring; 13. Locating pin; 101. Fan blade shaft; 102. Bearing; 103. Floating block; 14. First fixing screw; 15. Second fixing screw. DETAILED DESCRIPTION

[0020] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] As introduced in the background technology, the heat dissipation of the existing engine cooling system is mainly achieved by directly or indirectly driving the cooling fan through the engine crankshaft to take away the heat. The existing conventional fans can only suck or blow air, and mainly realize the heat dissipation function of the engine cooling water tank. At present, agricultural machinery and some special work vehicles are easily affected by the external environment when working. For example, when the fan is working for heat dissipation, long-term air suction will cause objects in the environment to be adsorbed on the water tank body, reducing the heat dissipation efficiency of the cooling fan to the water tank. In severe cases, it may cause the engine to overheat or even stop working. In order to solve this problem, the present invention A three-angle reversing fan device is provided, which mainly includes an oil inlet component, a blade shaft component, a blade seat body, a connecting plate, a first reset spring, an oil cylinder, a piston, a first sealing ring, a second sealing ring and an intermediate angle control component; the piston is fixedly connected to one side of the blade seat body, the connecting plate is fixedly connected to the other side of the blade seat body, and the blade shaft component is evenly installed on the circumference of the blade seat body. A first sealing ring is arranged between the oil cylinder and the piston, a second sealing ring is arranged between the oil cylinder and the connecting plate, the oil cylinder, the piston and the connecting plate together form a sealed pressure space, and a first reset spring is arranged between the oil cylinder and the piston. The intermediate angle control component is installed on the piston, located on the outer ring of the circumference of the first reset spring, specifically close to the oil inlet end of the piston; the radial and axial maximum boundary dimensions of the piston are not increased due to the installation of the intermediate angle control component; The axial length of the reversing fan device body is not increased.

[0023] Example 1 like Figure 1 , Figure 2 , Figure 3 As shown, the present embodiment discloses a three-angle reversing fan device, which mainly includes an oil inlet component 6, a blade shaft component 1, a blade seat body 2, a connecting disk 9, a first return spring 7, a cylinder 10, a piston 3, a first sealing ring 11, a second sealing ring 12 and an intermediate angle control component; the piston 3 is fixedly connected to one side of the blade seat body 2, and the connecting disk 9 is fixedly connected to the other side of the blade seat body 2; the first sealing ring 11 is arranged between the cylinder 10 and the piston 3, and the second sealing ring 12 is arranged between the cylinder 10 and the connecting disk 9, the cylinder 10, the piston 3 and the connecting disk 9 jointly form a sealed pressure space, and the first return spring 7 is arranged between the cylinder 10 and the piston 3; the intermediate angle control component is located outside the circumference of the first return spring 7, and the intermediate angle control is close to the oil inlet end side of the piston; the intermediate angle control component in the present embodiment is installed on the piston 3, located on the outer ring of the first return spring 7, and located on the oil inlet end side of the piston 3, so that the intermediate angle control component is arranged without increasing the axial dimension of the existing reversing fan body, so that the reversing fan is better matched on the size boundary. That is, when the boundary size conditions are not increased, an intermediate angle control component is arranged in the conventional reversing fan body, and the intermediate angle can be set to any angle between the first angle and the second angle, which can be used for small air volume suction, exhaust or zero angle of the fan blade, so that the vehicle can achieve power reduction, noise reduction or rapid temperature rise functions; and the hydraulic pressure space diameter can also be adjusted in this three-angle reversing fan device, by adjusting the position and size of the diameter of the second sealing ring 12 and the first sealing ring 11, and calculating the required axial pressure after the oil pressure conversion according to the diameter difference, it can match the use requirements of most vehicles in the market, and no additional boost or depressurization equipment conversion is required. If a similar technical solution is used for simple adjustments or changes, whether or not it exceeds the boundary size of the original structure, it is within the protection scope of this application.

[0024] It should be noted that; the present invention installs the intermediate angle control component on the piston 3, located on the outer ring of the first return spring 7, and close to the oil inlet end of the piston 3; the second fixing screw 15 between the piston 3 and the fan blade seat body 2 is located at the outermost diameter position of the piston 3, and the intermediate angle control component is installed on the piston 3 body close to this second fixing screw 15. The fixed contact area between the intermediate angle control component and the piston 3 is large, and multiple first fixing screws 14 can be arranged on the circumference as needed, and the fixing structure is more reliable; during the reversing process, the intermediate angle control component is close to the second fixing screw 15 between the piston 3 and the fan blade seat body 2 due to the force position, so this device is beneficial to improve the bearing capacity of the piston 3 and avoid deformation or damage of the piston 3 due to the reversing work process.

[0025] Furthermore, the piston 3 in the present embodiment has a two-layer annular piston body structure, and an annular mounting cavity is formed between the inner annular body and the outer annular body. The intermediate angle control component and the first return spring 7 are both arranged in the annular mounting cavity of the piston 3. The intermediate angle control component and the first return spring 7 do not exceed the radial and axial maximum dimensions of the piston 3, and do not increase the axial length of the reversing fan device body; and the intermediate angle control component is located on the outer ring of the first return spring 7; the first return spring 7 is inserted and fitted in the annular mounting cavity as a whole, and the first return spring 7 is always in a compressed state. In the absence of external pressure, the elastic force provided by the first return spring 7 stabilizes the position between the fan piston 3 and the fan cylinder 10, thereby ensuring the stability of the angle of the blades, and preventing changes in the angle of the blades due to changes in the fan speed.

[0026] Specifically, the intermediate angle control component in this embodiment is composed of a fixed block 4, a movable block 5 and a second return spring 8. The second return spring 8 is compressibly installed between the movable block 5 and the piston 3. The movable block 5 is limited by the fixed block 4, and the fixed block 4 and the piston 3 are fixedly connected with screws.

[0027] More specifically, the fixed block 4 in this embodiment is an annular block, and the movable block 5 is an annular block; the second return spring 8 is a large spring with a diameter greater than that of the first return spring 7, wherein the axial cross-section of the fixed block 4 is L-shaped, comprising a connecting portion and a matching portion, the connecting portion is connected to the piston 3 by a screw, and the matching portion is slidably matched with the movable block 5; the axial cross-section of the movable block 5 is an irregular polygon, the outer side surface of which is matched with the matching portion of the fixed block 4, and the inner side surface is matched with the first return spring 7 and the second return spring 8, and the second return spring 8 is compressibly installed between the movable block 5 and the piston 3; As another embodiment, the fixed block 4 in this embodiment can also be designed as a small arc block, and correspondingly, the movable block 5 can also be designed as a small arc block; the second return spring 8 is a small spring with a diameter smaller than the first return spring 7, and multiple second return springs 8 can be provided, and multiple second return springs 8 are evenly arranged along the circumferential direction of the piston 3; wherein the axial cross-section of the fixed block 4 is L-shaped, and it includes a connecting portion and a matching portion, the connecting portion is connected to the piston 3 by a screw, and the matching portion is slidably matched with the movable block 5; the axial cross-section of the movable block 5 is an irregular polygon, the outer side surface of which is matched with the matching portion of the fixed block 4, and the inner side surface is matched with the first return spring 7 and the second return spring 8, and the second return spring 8 is compressibly installed between the movable block 5 and the piston 3; like Figure 4As shown, the blade shaft component 1 in this embodiment includes a blade shaft 101, a bearing 102, a floating block 103 and a positioning pin 13. The blade shaft component 1 is evenly installed on the circumference of the blade seat 2, and the blade shaft 101 can rotate around its own axis relative to the blade seat 2. The blade shaft 101 is installed with a positioning pin 13 through an eccentric hole, and the positioning pin 13 is slidably installed on the oil cylinder 10 through the floating block 103. With the axial movement of the oil cylinder 10, within a certain displacement range, the blade shaft 101 can rotate around its own axis to achieve a change in the angle of the blade shaft 101. The blades are fixedly installed on the blade shaft 101, and the change of the blade angle is further achieved by changing the angle of the blade shaft 101.

[0028] Furthermore, the first return spring 7 and the second return spring 8 are both coil springs. The specific working principle is as follows: like Figure 1 As shown, the preload force of the first return spring 7 acts on the piston 3 and the cylinder 10. The cylinder 10 presses the connecting plate 9 under the preload force and is fixed by the end face limit of the connecting plate 9. The fan shaft 101 is in the first angle state at this time.

[0029] like Figure 2 As shown, the oil inlet component 6 is installed on the piston 3, and the oil inlet part is connected to the sealed pressure space. When the first pressure is input into the oil inlet component 6, the cylinder 10 overcomes the elastic force of the first return spring 7 and moves axially toward the piston 3. When the cylinder 10 contacts the movable block 5, the remaining force after the input first pressure overcomes the first return spring 7 is less than the preload force of the second return spring 8. At this time, the movable block 5 limits the axial movement of the cylinder 10, and the fan shaft 101 reaches the middle angle state.

[0030] like Figure 3 As shown, when the oil inlet component 6 inputs the second pressure, the cylinder 10 overcomes the elastic force of the first return spring 7 and moves axially toward the piston 3. After the cylinder 10 contacts the movable block 5, the remaining force after the input second pressure overcomes the first return spring 7 is still greater than the preload force of the second return spring 8. At this time, the cylinder 10 continues to compress the second return spring 8 and the first return spring 7 through the movable block 5 under the action of the input second pressure. The movable block 5 contacts the end face of the piston 3 and limits the position. At this time, the fan shaft 101 reaches the second angle state.

[0031] Furthermore, when the oil inlet pressure of the oil inlet component 6 is removed, the oil cylinder 10 and the movable block 5 are reset under the action of the first reset spring 7 and the second reset spring 8 respectively, and return to the first angle state.

[0032] When the vehicle matching pressure is a normal pressure value, the second sealing ring 12 is set at a matching diameter position between the oil cylinder 10 and the connecting plate 9. The diameters of the second sealing ring 12 and the first sealing ring 11 can be appropriately adjusted within the allowable range of the structure, and the required axial pressure after the oil pressure of the matching vehicle is converted is calculated based on the diameter difference.

[0033] Furthermore, the middle angle in this embodiment can be any angle between the first angle and the second angle; it can be used as a small air volume suction, exhaust or zero angle of the fan blade, so that the vehicle can achieve power reduction, noise reduction or rapid temperature increase functions. In addition, the hydraulic pressure space can be adjusted in this three-angle reversing fan device, which can adapt to vehicles with low and high hydraulic pressures without the need for additional boost or depressurization equipment conversion.

[0034] Furthermore, the fan blade shaft component 1 includes an eccentrically arranged positioning pin 13, and the positioning pin 13 can be slidably installed on the cylinder 10. With the axial movement of the cylinder 10, the fan blade shaft 101 can rotate around its own axis to further change the fan blade angle.

[0035] Example 2 This embodiment discloses a three-angle reversing fan device, such as Figure 5 As shown, the difference between this embodiment and embodiment 1 is that the position of the second sealing ring 12 is different. The second sealing ring 12 in this embodiment is arranged at the maximum matching diameter position of the cylinder 10 and the connecting plate 9. This solution is mainly suitable for adjusting the diameters of the second sealing ring 12 and the first sealing ring 11 within the allowable range of the structure when the matching pressure of the vehicle is relatively small. When the adjusted diameter cannot meet the use requirements, the second sealing ring 12 is arranged at the maximum matching diameter position of the cylinder 10 and the connecting plate 9 to meet the application of the three-angle reversing fan of the vehicle with relatively small pressure, without the need for additional boosting equipment, thereby reducing the use cost and improving product reliability.

[0036] Example 3 This embodiment discloses a three-angle reversing fan device, such as Figure 6 As shown, the difference between this embodiment and embodiment 1 is that the position of the second sealing ring 12 is different. The second sealing ring 12 in this embodiment is arranged at the position of the minimum matching diameter of the cylinder 10 and the connecting plate 9. This solution is mainly suitable for adjusting the diameters of the second sealing ring 12 and the first sealing ring 11 within the allowable range of the structure when the matching pressure of the vehicle is relatively large. When the adjusted diameter cannot meet the use requirements, the second sealing ring 12 can be set at the position of the minimum matching diameter of the cylinder 10 and the connecting plate 9 to meet the application of the three-angle reversing fan of the vehicle with relatively large pressure, without the need for additional pressure reduction equipment, thereby reducing the use cost and improving product reliability.

[0037] Example 4 This embodiment discloses a three-angle reversing fan device, such as Figure 7 As shown, the difference between this embodiment and embodiment 1 is that the height of the end surface of the middle part of the piston 3 can be increased to be higher than or equal to the top surface of the movable block 5 in the second angle state. At this time, when the fan reaches the second angle state, the end surface of the middle part of the piston 3 can be used to directly limit the oil cylinder 10, without limiting it through the transition of the movable block 5. The piston 3 and the oil cylinder 10 are directly limited by the end surface, which can avoid the accumulation of tolerances of multiple parts, so that when the fan reaches the second angle state, the control of the second angle is more accurate, and the processing and manufacturing cost can be further reduced.

[0038] Example 5 This embodiment discloses an engine, the fan of the cooling system of the engine adopts the three-angle reversing fan device disclosed in any one of Embodiments 1 to 4. Since the engine is provided with the three-angle reversing fan device as described above, the rail vehicle also has all the advantages as described above.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-angle reversing fan device, comprising an oil inlet component, a blade shaft component, a blade seat body, a connecting plate, a first return spring, an oil cylinder, a piston and an intermediate angle control component, wherein the piston is fixedly connected to one side of the blade seat body, the connecting plate is fixedly connected to the other side of the blade seat body, and the blade shaft components are evenly installed on the circumference of the blade seat body, characterized in that: A first sealing ring is arranged between the oil cylinder and the piston, a second sealing ring is arranged between the oil cylinder and the connecting plate, the oil cylinder, the piston and the connecting plate together form a sealed pressure space, a first return spring is arranged between the oil cylinder and the piston, and the intermediate angle control component is installed on the piston, located on the outer ring of the first return spring, and located close to the oil inlet end of the piston.

2. A three-angle reversing fan device according to claim 1, characterized in that: The piston is a two-layer annular piston body structure, an annular installation cavity is formed between the inner annular body and the outer annular body, and the intermediate angle control component and the first return spring are arranged in the annular installation cavity of the piston.

3. A three-angle reversing fan device according to claim 1, characterized in that: The intermediate angle control component includes a fixed block, a movable block and a second return spring. The second return spring is compressibly installed between the movable block and the piston. The movable block is limited by the fixed block, and the fixed block is fixedly connected to the piston.

4. A three-angle reversing fan device as claimed in claim 3, characterized in that: The fixed block is an annular block, and the movable block is an annular block; the second return spring is a spring with a diameter larger than that of the first return spring.

5. A three-angle reversing fan device as claimed in claim 3, characterized in that: The fixed block is an arc-shaped block, and the movable block is also an arc-shaped block; the second return spring is a spring with a smaller diameter than the first return spring.

6. A three-angle reversing fan device according to claim 1, characterized in that: The matching positions of the oil cylinder where the second sealing ring is located and the connecting plate are adjustable.

7. A three-angle reversing fan device as claimed in claim 6, characterized in that: The second sealing ring is arranged at a matching diameter position between the oil cylinder and the connecting plate.

8. A three-angle reversing fan device as claimed in claim 6, characterized in that: The second sealing ring is arranged at the maximum matching diameter position between the oil cylinder and the connecting plate.

9. A three-angle reversing fan device as claimed in claim 6, characterized in that: The second sealing ring is arranged at the position of the minimum matching diameter between the oil cylinder and the connecting plate.

10. An engine, characterized in that: The reversing fan in the cooling system adopts the three-angle reversing fan device described in any one of claims 1-9.

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