Mechanical direct-connection fan capable of automatically adjusting blade angle

Abstract

A mounting cavity is filled with paraffin or palm wax, a sliding block is further installed in the mounting cavity in a sliding fit mode, a rotating shaft is arranged on the sliding block in a penetrating mode in the sliding direction of the sliding block, the two ends of the rotating shaft penetrate through the front side wall and the rear side wall of the mounting cavity, and a pin shaft is arranged on the rotating shaft in a penetrating mode in the radial direction; the two ends of the pin shaft are arranged on the left side wall and the right side wall of the groove in a striding mode, a spring is further installed in the installation cavity, the front end of the spring abuts against the rear side wall of the installation cavity, and the rear end of the spring abuts against the front side wall of the sliding block. The invention has the following beneficial effects: under the low-temperature working condition of the engine, the fan blades are at a horizontal angle, and the fan and the engine are directly connected and synchronously rotate without generating air volume, so that the oil consumption of the engine under the low-temperature working condition can be reduced; under the high-temperature working condition of the engine, the fan and the engine are directly connected and synchronously rotate, the maximum air volume at the corresponding rotating speed can be generated, and the heat dissipation efficiency of the engine under the high-temperature working condition is improved.

Description

Technical Field

[0001] The present invention relates to engine heat dissipation, in particular to a mechanical direct-connected fan with automatically adjustable blade angles. Background Art

[0002] Traditional mechanical silicone oil fans sense the air temperature passing through the radiator. The metal temperature sensor is heated and deformed to automatically adjust the opening and closing of the oil inlet hole of the silicone oil cavity. When the temperature reaches a specific temperature, the viscosity characteristic of the silicone oil is utilized to make the driving disc of the fan drive the fan housing and the fan blades to rotate together, so as to synchronize the fan speed with the engine speed and increase the fan air volume. However, in actual applications, it is often found that when the air temperature passing through the radiator is not high and has not reached the specific temperature, the fan has already rotated at a low speed together with the engine, generating a certain amount of air volume to dissipate heat from the engine, causing the engine to not reach the appropriate operating water temperature quickly, and also causing a certain load consumption to the engine, increasing the engine fuel consumption. At the same time, when the air temperature passing through the radiator has reached the specific temperature, since the driving disc of the fan is not rigidly connected to the fan housing and the fan blades, it is impossible to achieve complete synchronization of the fan speed with the engine speed, and the heat dissipation requirement of the engine at this speed cannot be met. During the vehicle thermal balance test, it is often necessary to replace a fan with a larger diameter or a larger number of blades to increase the air volume to solve the problem. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a mechanical direct-connected fan with automatically adjustable blade angles.

[0004] The purpose of the present invention is realized by the following technical solutions: A mechanical direct-connected fan with automatically adjustable blade angles includes a housing, a cover plate, and fan blades. A plurality of installation cavities are opened along the radial direction on the upper edge inside the housing, and the installation cavities are arranged at intervals in the circumferential direction. The cover plate is installed on the housing so that the installation cavities are sealed cavities. Paraffin or palm wax is filled in the installation cavities. A slider that slides back and forth is installed in the installation cavity. The rear end of the fan blade is connected with a rotating shaft, and the rotating shaft sequentially passes through the front side wall of the installation cavity, the slider, and the rear side wall of the installation cavity in the radial direction. A limiting member for preventing the rotating shaft from sliding back and forth is installed at the rear end of the rotating shaft. A groove is opened on the slider, and the rotating shaft passes through the groove. A first inclined surface is opened on the left side wall of the groove, and a second inclined surface is opened on the right side wall of the groove. In the left projection plane, the first inclined surface and the second inclined surface intersect. The front end of the left side wall of the groove is provided with a first plane, the front end of the right side wall of the groove is provided with a second plane, and the first plane and the second plane are flush. The rear end of the right side wall of the groove is also provided with a third plane, and an inclined slotted groove is opened on the third plane. A pin shaft is radially penetrated through the rotating shaft, and both ends of the pin shaft straddle the left and right side walls of the groove. A spring is also installed in the installation cavity. The front end of the spring presses against the rear side wall of the installation cavity, and the rear end of the spring presses against the front side wall of the slider.

[0005] Optionally, a slot is provided on the end of the rotating shaft that passes through the rear side wall of the installation cavity, and a retaining spring is installed on the slot.

[0006] Optionally, the fan blade is detachably connected to the rotating shaft by thread, and a threaded hole threadedly connected to the rotating shaft is provided at the rear end of the fan blade.

[0007] Optionally, the shell is a disc, and the mounting cavities are evenly distributed on the same circumference.

[0008] Optionally, the cover plate and the shell are detachably connected via a locking screw, and the locking screw is located between two adjacent mounting cavities.

[0009] Optionally, a slot body is provided between two adjacent installation cavities, a threaded column is provided in the slot body, and a locking screw is locked with the threaded column.

[0010] Optionally, a receiving groove corresponding to the installation cavity is provided on the shell, and the protruding end of the rear end of the rotating shaft is located in the receiving groove.

[0011] 1. When the engine is working at low temperature, the fan blades of the fan of the present invention are at a horizontal angle, the fan and the engine are directly connected and rotate synchronously, but no air volume is generated, which can reduce the fuel consumption of the engine under low temperature conditions;

[0012] 2. When the fan of the present invention is under high-temperature engine conditions, the slider slides to the front end under the action of centrifugal force. At this time, the blades are at the maximum angle. The fan and the engine are directly connected and rotate synchronously, which can generate the maximum air volume at the corresponding speed and improve the heat dissipation efficiency of the engine under high-temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the structure of the fan;

[0014] Figure 2 It is a schematic diagram of the installation of the slider in the installation cavity;

[0015] Figure 3 It is a schematic diagram of the installation of the rotating shaft and the slider;

[0016] Figure 4 It is a structural schematic diagram of the slider;

[0017] In the figure, 1-housing, 2-blades, 3-cover plate, 4-installation cavity, 5-slider, 6-spring, 7-pin shaft, 8-rotating shaft, 9-first inclined plane, 10-second inclined plane, 11-oblique slot, 12-circlip, 13-first plane, 14-second plane, 15-third plane. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0020] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0021] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the invention is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] As Figure 1As shown, a fan includes a fan blade 2 and also includes an angle adjustment mechanism. In this embodiment, the angle adjustment mechanism includes a housing 1, a cover plate 3, and a driving device for driving the housing 1 to perform circular motion. The driving device is an engine. When the engine works, the fan also works. When the engine stops working, the fan also stops working. And the engine driving the fan to rotate belongs to the prior art, so its connection relationship and driving principle will not be elaborated here. When the engine works, it drives the housing 1 to rotate. In this embodiment, as Figure 2 shown, a plurality of installation cavities 4 are formed in the housing 1 in the radial direction. The installation cavities 4 are arranged at intervals in the circumferential direction. Preferably, the housing 1 is a disc, and the installation cavities 4 are evenly distributed on the same circumference. Further, there are 9 installation cavities 4. The cover plate 3 is installed on the housing 1 to make the installation cavity 4 a sealed cavity. Sealing the cavity through the cover plate 3 belongs to the prior art and will not be elaborated here. Paraffin or carnauba wax is filled in the installation cavity 4. Paraffin or carnauba wax is in a solid state below the melting point, and paraffin or carnauba wax is in a liquid state above the melting point. For the clutch assembly, when the input speed is 4300 rpm and the temperature at the front end of the fan is below 40 ± 5 °C, the output speed is not higher than 1300 rpm. At this time, the air volume of the fan does not need to be adjusted to the maximum. That is to say, the rotation angle of the fan blade 2 is the smallest, and the paraffin or carnauba wax is in a solid state. When the temperature at the front end of the fan is 60 ± 5 °C, the output speed is: 2000 ± 200 rpm. At this time, the clutch has certain requirements for the air volume. Therefore, the angle of the fan blade 2 needs to be adjusted to the maximum. At this time, the paraffin or carnauba wax is in a liquid state. When the temperature at the front end of the fan is 80 ± 5 °C, the output speed is greater than 3800 rpm. At this time, the angle of the fan blade 2 also needs to be adjusted to the maximum, and the paraffin or carnauba wax is also in a liquid state. In this embodiment, determined by ASTM D87 standard, the melting point range of paraffin is usually between 58 - 62 °C. When paraffin is used as the filler, when the temperature at the front end of the fan exceeds the melting point of paraffin, the paraffin melts. When the temperature at the front end of the fan is lower than the melting point of paraffin, the paraffin is in a solid state. And for carnauba wax, carnauba wax with a melting point of 80 ± 5 °C is selected. Preferably, carnauba wax from Brazil is selected, and its melting point is 82.5 °C. That is to say, when the temperature at the front end of the fan is higher than the temperature of carnauba wax, carnauba wax is in a liquid state. When the temperature at the front end of the fan is lower than the temperature of carnauba wax, carnauba wax is in a liquid state. In actual use, paraffin or carnauba wax can be selected according to the actual situation.

[0025] In this embodiment, as Figure 2 shown, a slider 5 is also slidably fitted in the installation cavity 4. As Figure 3 and Figure 4As shown, the slider 5 includes a body, on which a groove is provided. A first inclined surface 9 is provided on the left side wall of the groove, and a second inclined surface 10 is provided on the right side wall of the groove. In the left projection plane, the first inclined surface 9 and the second inclined surface 10 intersect. The front end of the left side wall of the groove is provided with a first plane 13, and the front end of the right side wall of the groove is provided with a second plane 14. The first plane 13 and the second plane 14 are flush. The rear end of the right side wall of the groove is also provided with a third plane 15. An inclined slotted card 11 is provided on the third plane 15. A rotating shaft 8 is passed through the slider 5 along its sliding direction. Both ends of the rotating shaft 8 pass through the front and rear side walls of the installation cavity 4, and limiting members for preventing the front and rear sliding of the rotating shaft 8 are provided at the passing ends of both ends of the rotating shaft 8. A pin shaft 7 is radially passed through the rotating shaft 8, and both ends of the pin shaft 7 straddle the left and right side walls of the groove. A spring 6 is also installed in the installation cavity 4. The front end of the spring 6 abuts against the rear side wall of the installation cavity 4, and the rear end of the spring 6 abuts against the front side wall of the slider 5. In the initial state, the spring 6 applies a thrust to the slider 5, so that the slider 5 is in the rear stroke. The pin shaft 7 straddles the first plane 13 and the second plane 14. Moreover, at this time, the paraffin or palm wax is below its melting point, so the positions of the slider 5 and the pin shaft 7 are fixed, and the fan blade 2 cannot rotate. As the engine works, the fan blade 2 rotates in the circumferential direction, thus providing a small air volume. As the temperature at the front end of the fan rises, the temperature of the paraffin or palm wax also rises. When the temperature at the front end of the fan is higher than the melting point of the paraffin or palm wax, the paraffin or palm wax is in a liquid state. At this time, the centrifugal force of the slider 5 is greater than the elastic force applied by the spring 6 to the slider 5, and the slider 5 slides forward. The left end of the pin shaft 7 moves from the first plane 13 to the first inclined surface 9, and the right end of the pin shaft 7 moves from the second plane 14 to the second inclined surface 10. Since in the left projection plane, the first inclined surface 9 and the second inclined surface 10 intersect, the pin shaft 7 is deflected, thus adjusting the angle of the fan blade 2. When the right end of the pin shaft 7 moves from the second inclined surface 10 to the third plane 15, an inclined slotted card 11 is provided on the third plane 15, and the right end of the pin shaft 7 is stuck in the slotted card 11 on the third plane 15. At this time, the pin shaft 7 cannot continue to deflect, and the deflection angle of the fan blade 2 is adjusted to the maximum, realizing the output of the maximum air volume.

[0026] In this embodiment, as Figure 3As shown in the figure, a connector is provided at the rear end of the fan blade 2. The connector is detachably connected to the rotating shaft 8. A threaded hole is provided on the connector, and an external thread is provided at the front end of the rotating shaft 8. The rotating shaft 8 and the connector are threadedly connected. Further, when the rotating shaft 8 and the connector are installed, the connector contacts the outer side wall of the housing 1. At this time, the front end of the rotating shaft 8 is restricted, and the rear end of the rotating shaft 8 is restricted by a limiting member, thereby preventing the rotating shaft 8 from moving back and forth and ensuring the reliability of the operation of the fan blade 2. Further, the limiting member is a snap ring 12. A clamping groove is provided on the passing end of the rotating shaft 8 passing through the rear side wall of the installation cavity 4, and the snap ring 12 is installed on the clamping groove. In this embodiment, the housing 1 is a disc, the power output end of the driving device is connected to the middle of the housing 1, and a receiving groove corresponding to the installation cavity 4 is provided on the housing 1. The passing end of the rear end of the rotating shaft 8 is located in the receiving groove.

[0027] In this embodiment, as Figure 2 shown, the cover plate 3 and the housing 1 are detachably connected by locking screws, and the locking screws are located between two adjacent installation cavities 4. Further, in order to reduce the weight of the housing 1 and reduce energy consumption, a groove body is provided between two adjacent installation cavities 4, a threaded column is provided in the groove body, and the locking screw is locked with the threaded column.

[0028] The working process of the present invention is as follows: When the engine works, it drives the fan to work. The water temperature of the circulating water gradually rises, and then the water temperature entering the air-cooled area also rises, which drives the housing 1 and the fan blade 2 to perform circular motion. After the fan blade 2 works, it generates suction to suck in cold air, and the cold air will take away part of the temperature of the circulating water, thereby causing the cold air to heat up. That is to say, the temperature at the front end of the fan rises. When the temperature at the front end of the fan is higher than the melting point of paraffin or palm wax, the paraffin or palm wax is in a liquid state. At this time, it indicates that the circulating water requires a greater air volume for heat exchange. After the paraffin or palm wax is in a liquid state, the centrifugal force of the slider 5 is greater than the elastic force exerted by the spring 6 on the slider 5, and the slider 5 slides forward. The left end of the pin shaft 7 moves from the first plane 13 to the first inclined surface 9, and the right end of the pin shaft 7 moves from the second plane 14 to the second inclined surface 10. Since on the left projection plane, the first inclined surface 9 and the second inclined surface 10 intersect, the pin shaft 7 deflects, thereby adjusting the angle of the fan blade 2. When the right end of the pin shaft 7 moves from the second inclined surface 10 to the third plane 15, there is an inclined slot 11 opened on the third plane 15, and the right end portion of the pin shaft 7 is stuck in the inclined slot 11 on the third plane 15. At this time, the pin shaft 7 cannot continue to deflect, and thus the deflection angle of the fan blade 2 is adjusted to the maximum, realizing the output of the maximum air volume. When the engine stops working, the fan also stops rotating. At this time, the slider 5 is not affected by the centrifugal force. At this time, the paraffin or palm wax is still in a liquid state, and the slider 5 resets under the action of the spring 6, and the fan blade 2 also returns to the minimum deflection angle. Preferably, the minimum deflection angle of the fan blade 2 is the horizontal angle. At this time, the fan blade 2 rotates but does not generate air volume. Then, the temperature at the front end of the fan gradually approaches the outdoor temperature, and the paraffin or palm wax changes from a liquid state to a solid state, thereby playing a fixing role on the slider 5 and the pin shaft 7.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, 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 mechanical direct-connected fan with automatic blade angle adjustment, characterized in that: The invention comprises a shell, a cover plate and a fan blade, wherein a plurality of installation cavities are provided in the radial direction on the inner side of the shell, and the installation cavities are arranged at intervals in the circumferential direction, the cover plate is installed on the shell, and the installation cavity is a sealed cavity, the installation cavity is filled with paraffin or palm wax, a slider that slides forward and backward is slidably installed in the installation cavity, a rotating shaft is connected to the rear end of the fan blade, and the rotating shaft radially passes through the front side wall of the installation cavity, the slider and the rear side wall of the installation cavity in sequence, and a limiting member that prevents the rotating shaft from sliding forward and backward is installed at the rear end of the rotating shaft, a groove is provided on the slider, the rotating shaft passes through the groove, and a first An inclined surface, a second inclined surface is provided on the right side wall of the groove, and on the left side projection surface, the first inclined surface and the second inclined surface intersect, a first plane is provided at the front end of the left side wall of the groove, and a second plane is provided at the front end of the right side wall of the groove, the first plane and the second plane are flush, and a third plane is also provided at the rear end of the right side wall of the groove, and an inclined inclined groove is provided on the third plane, a pin shaft is radially penetrated on the rotating shaft, and both ends of the pin shaft are straddling the left and right side walls of the groove, and a spring is also installed in the mounting cavity, the front end of the spring presses against the rear side wall of the mounting cavity, and the rear end of the spring presses against the front side wall of the slider.

2. A mechanical direct-connected fan with automatic blade angle adjustment according to claim 1, characterized in that: A clamping groove is provided on the end of the rotating shaft passing through the rear side wall of the installation cavity, and a clamping spring is installed on the clamping groove.

3. The mechanical direct-connected fan with automatic blade angle adjustment according to claim 1, characterized in that: The fan blade is detachably connected to the rotating shaft by thread, and a threaded hole threadedly connected to the rotating shaft is provided at the rear end of the fan blade.

4. The mechanical direct-connected fan with automatic blade angle adjustment according to claim 1, characterized in that: The shell is a disc, and the mounting cavities are evenly distributed on the same circumference.

5. A mechanical direct-connected fan with automatic blade angle adjustment according to any one of claims 2 to 4, characterized in that: The cover plate is detachably connected to the shell through a locking screw, and the locking screw is located between two adjacent installation cavities.

6. A mechanical direct-connected fan with automatic blade angle adjustment according to claim 5, characterized in that: A slot body is provided between two adjacent installation cavities, a threaded column is provided in the slot body, and the locking screw is locked with the threaded column.

7. A mechanical direct-connected fan with automatic blade angle adjustment according to claim 6, characterized in that: The shell is provided with a receiving groove corresponding to the installation cavity, and the protruding end of the rear end of the rotating shaft is located in the receiving groove.

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