Ventilation circulating fan for rice barn

Abstract

The invention discloses a ventilation circulating fan for a rice barn, and relates to the technical field of fans, the ventilation circulating fan comprises a main body, an airflow channel is constructed in the main body, fan blades are rotatably connected in the airflow channel, the ventilation circulating fan further comprises a plugging mechanism, and when the fan blades rotate, the plugging mechanism opens the airflow channel so that the airflow channel can communicate with the rice barn; and when the fan blades stop rotating, the blocking mechanism seals the airflow channel. According to the ventilation circulating fan for the rice barn, when the fan blades stop rotating, the air flow channel is blocked through the blocking mechanism, so that the rice barn is isolated from the outside, and outside humid air or insects are prevented from entering the rice barn as much as possible; when the fan blades rotate to enable the rice bin to conduct circulating ventilation, the air flow channel is opened through the blocking mechanism, so that the rice bin communicates with the outside through the air flow channel, and then the rotating speed of the fan blades can be increased to guide air to flow.

Description

Technical Field

[0001] The invention relates to the technical field of fans, and in particular to a ventilation circulation fan for a rice bin. Background Art

[0002] Rice is a finished product made from paddy rice after processes such as cleaning, husking, milling and finishing. It is also the main food of people in the south. Generally, during the storage process of rice, ventilation devices (such as fans) are needed to ventilate, cool and dehumidify the rice storage room to ensure the long-term preservation of the rice.

[0003] For example, the patent document with the authorization announcement number CN220211728U and the authorization announcement date December 22, 2023, and named "A Rice Ventilation System", includes a rice bin, in which ventilation parts for ventilation are provided; this patent can achieve rice ventilation, solve the problem of moldy rice during storage, effectively remove moisture from the rice, and keep the rice in the storage bin in a dry state.

[0004] In the prior art, a fan is installed in the rice bin to allow air circulation. When the fan is running, the air circulates through the fan. When the fan is stopped, the fan is in an open state, so that the rice bin is connected to the outside world through the fan, which will have a negative impact on the storage environment of the rice bin. Summary of the invention

[0005] The object of the present invention is to provide a ventilation circulation fan for a rice bin to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A ventilation circulation fan for a rice bin, comprising a main body, an air flow channel configured in the main body, a fan blade rotatably connected in the air flow channel, and further comprising:

[0008] The blocking mechanism opens the airflow channel when the fan blades rotate so that the airflow channel is connected to the rice bin; when the fan blades stop rotating, the blocking mechanism closes the airflow channel.

[0009] The above-mentioned ventilation circulation fan for rice bin, the sealing mechanism includes a fixing ring fixed on the main body, the fixing ring is formed with air vents, and the fixing ring is rotatably connected with a plurality of arc plates, and the plurality of arc plates can seal the air vents when they rotate toward the center of the fixing ring at the same time.

[0010] The above-mentioned ventilation circulation fan for rice bin, the blocking mechanism also includes a driving ring rotatably connected to the main body, a plurality of connecting rods are hinged on the driving ring, and the plurality of connecting rods are respectively hinged to a plurality of arc plates.

[0011] In the above-mentioned ventilation circulation fan for rice bin, as the rotation speed of the fan blade gradually increases, the blocking mechanism gradually opens the air flow channel, and as the rotation speed of the fan blade gradually decreases, the blocking mechanism gradually closes the air flow channel.

[0012] The above-mentioned ventilation circulation fan for rice bin is characterized in that sealing mechanisms are provided at both ends of the main body.

[0013] In the above-mentioned ventilation circulation fan for rice bin, in the flow direction of the air, the speed at which the sealing mechanism located upstream opens the airflow channel is lower than the speed at which the sealing mechanism located downstream opens the airflow channel, so that in the process of the two groups of sealing mechanisms opening the airflow channel, the air flow rate upstream of the airflow channel is higher than the air flow rate downstream.

[0014] The above-mentioned ventilation circulation fan for rice bin, in the process of the two groups of sealing mechanisms closing the airflow channel, the speed at which the sealing mechanism located upstream closes the airflow channel is lower than the speed at which the sealing mechanism located downstream closes the airflow channel, so that in the process of the two groups of sealing mechanisms closing the airflow channel, the air flow rate upstream of the airflow channel is lower than the air flow rate downstream.

[0015] The above-mentioned ventilation circulation fan for rice bin has two rotating wheels rotatably connected to the main body, the two rotating wheels are coaxially fixed, and connecting columns are fixed on the sides of the two rotating wheels away from each other. Two driving rods are hinged on the main body, and the two driving rods are constructed with through grooves, and the two connecting columns are slidably connected in the two through grooves respectively.

[0016] The above-mentioned ventilation circulation fan for rice bin, the two hinge points of the driving rods and the main body are respectively located on both sides of the rotating wheel, one end of the driving rod is hinged to the main body and the hinge point is located on one side of the rotating wheel, and the other end of the driving rod is located on the other side of the rotating wheel and is transmission connected to the driving ring on the other side.

[0017] In the above-mentioned ventilation circulation fan for rice bin, during one rotation of the rotating wheel, in the first half of the rotation, the speed at which one of the driving rods drives the corresponding driving ring to rotate is greater than the speed at which the other driving rod drives the corresponding driving ring to rotate, and in the second half of the rotation, the speed at which the other driving rod drives the corresponding driving ring to reset is less than the speed at which one driving rod drives the corresponding driving ring to reset.

[0018] In the above technical scheme, the present invention provides a ventilation circulation fan for a rice bin. When the fan blades stop rotating, the air flow channel is blocked by a sealing mechanism to isolate the rice bin from the outside world and prevent humid air or insects from entering the rice bin as much as possible; when the fan blades rotate to circulate ventilation in the rice bin, the air flow channel is opened by the sealing mechanism to connect the rice bin and the outside world through the air flow channel, so that the fan blades can increase the rotation speed to guide the air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the airflow channel structure provided by yet another embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a curved plate structure provided in yet another embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a connecting rod structure provided in yet another embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a structure for opening a vent hole provided in yet another embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a vent opening structure provided by yet another embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a driving rod structure provided by another embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the initial position structure of a rotating wheel provided by another embodiment of the present invention;

[0028] Fig. 9 A schematic diagram of the structure of another position of a rotating wheel provided by yet another embodiment of the present invention;

[0029] Fig.10 A schematic diagram of another position structure of a rotating wheel provided in yet another embodiment of the present invention;

[0030] Fig.11 A schematic diagram of another position structure of a rotating wheel provided by another embodiment of the present invention;

[0031] Fig.12 A schematic diagram of the structure of a drive motor provided in yet another embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1. Main body; 2. Air flow channel; 3. Fan blades; 4. Bracket; 5. Fixing ring; 6. Arc plate; 7. Vent hole; 8. Driving ring; 9. Connecting rod; 10. Rotating wheel; 11. Connecting column; 12. Driving rod; 13. Through slot; 14. Connecting frame; 15. Connecting part; 16. Articulated rod; 17. Connecting slot; 18. Driving motor. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Reference Figure 1-12 An embodiment of the present invention provides a ventilation circulation fan for a rice bin, comprising a main body 1, an air flow channel 2 being constructed in the main body 1, and fan blades 3 being rotatably connected in the air flow channel 2, and also comprising a blocking mechanism, when the fan blades 3 rotate, the blocking mechanism opens the air flow channel 2 to connect the air flow channel 2 and the rice bin; when the fan blades 3 stop rotating, the blocking mechanism closes the air flow channel 2.

[0036] Specifically, the rice bin is used to store rice. A circulating fan is generally provided in the rice bin so that the rice bin is connected to the outside world through the fan. When the fan is running, the humid air in the rice bin can be discharged, thereby ensuring that the rice can be stored for a long time. In each embodiment of the present invention, the circulating fan is used to guide the air to be discharged from the rice bin. In order to ensure the circulation of the air in the rice bin, an air inlet can be provided at other positions in the rice bin. The above are all prior arts and will not be repeated here. In the embodiment of the present invention, a bracket 4 is fixed to the inner wall of the air flow channel 2, and the fan blades 3 are rotatably connected to the bracket 4 to form the main structure of the circulating fan. At this time, the two ends of the air flow channel 2 are respectively connected to the rice bin and the outside world, and the air circulation in the rice bin can be realized by the rotation of the fan blades 3. A motor structure is provided in the main body 1 to drive the fan blades 3 to rotate. This is a prior art, and the motor structure is not shown in the figure. The innovation point of the embodiment of the present invention is that a blocking mechanism is provided on the main body 1. The blocking mechanism can select a blocking plate structure in the prior art. The blocking plate can be slidably connected to the main body 1 to block the air flow channel 2. When the fan blades 3 stop rotating, the air flow channel 2 is blocked by the blocking mechanism to isolate the rice bin from the outside world and prevent humid air or insects from entering the rice bin as much as possible; when the rice bin needs to be ventilated, the fan blades 3 are driven to rotate by the motor structure, and the blocking mechanism is controlled to open the air flow channel 2, so that the rice bin and the outside world are connected through the air flow channel 2, so that the fan blades 3 can increase the rotation speed to guide the air flow (when the air flow channel 2 is blocked by the blocking mechanism, the air on both sides of the fan blades 3 is blocked during flow, so that the fan blades 3 can only keep rotating at a low speed).

[0037] In another embodiment provided by the present invention, as an alternative solution for the above-mentioned sealing plate to be slidably connected to the main body 1 to seal the airflow channel 2, further, the sealing mechanism includes a fixing ring 5 fixed to the main body 1, a vent 7 is formed on the fixing ring 5, and a plurality of arc plates 6 are rotatably connected to the fixing ring 5, and the plurality of arc plates 6 can seal the vent 7 when they rotate toward the center of the fixing ring 5 at the same time. Specifically, in the present embodiment, the main body 1 is constructed as a whole in a cylindrical shape, and an air flow channel 2 is formed inside the main body 1; the fixing ring 5 is constructed as a whole in an annular shape, and is fixed at the end of the main body 1 (air flow channel 2), and a vent hole 7 is formed in the middle part of the fixing ring 5, and the vent hole 7 is constructed in a circular shape, so that the air in the air flow channel 2 can flow through the vent hole 7; in the present embodiment, five arc plates 6 are provided, and the five arc plates 6 are all fitted with the fixing ring 5 and are evenly arranged along the circumference of the fixing ring 5. When the five arc plates 6 rotate toward the center of the fixing ring 5 (vent hole 7) at the same time, the five arc plates 6 fit each other to block the vent hole 7 (such as Figure 3 and Figure 4 On the contrary, when the five arc-shaped plates 6 are away from the center of the fixed ring 5 at the same time, the vent hole 7 can be opened (as shown in Figure 5 and Figure 6A plurality of motor structures may be provided on the fixing ring 5 to drive the plurality of arc-shaped plates 6 to rotate synchronously, so as to block or open the vent holes 7 based on the operation of the fan blades 3.

[0038] As an alternative to the above-mentioned multiple motors driving the multiple curved plates 6 to rotate synchronously, preferably, the blocking mechanism also includes a driving ring 8 rotatably connected to the main body 1, and the driving ring 8 is hinged with multiple connecting rods 9, and the multiple connecting rods 9 are respectively hinged with the multiple curved plates 6. Specifically, the driving ring 8 is constructed as an annular structure, and its inner diameter is larger than the diameter of the vent 7; the driving ring 8 and the fixed ring 5 are both constructed with a flange structure on the opposite side, so that the driving ring 8 is rotatably connected to the side of the fixed ring 5 close to the fan blade 3, that is, the driving ring 8 is rotatably connected to the main body 1 through the fixed ring 5 (such as Figure 4 and Figure 5 ) is a schematic diagram of the flange structure of the driving ring 8 and the hinge point of the driving ring 8 and the connecting rod 9); five connecting rods 9 are hinged on the driving ring 8, and the five connecting rods 9 are evenly arranged along the circumference of the driving ring 8. The five connecting rods 9 are respectively hinged with the five arc plates 6; with such an arrangement, when the driving ring 8 rotates, the five arc plates 6 can be driven to rotate synchronously and in the same direction through the five connecting rods 9, so as to open or block the vent 7. The advantage is that one driving ring 8 can drive five arc plates 6 to rotate synchronously. Compared with the above-mentioned solution of driving multiple arc plates 6 to rotate synchronously through multiple motor structures, in this embodiment, only one motor structure is needed to drive the driving ring 8 to rotate, so as to achieve the purpose of energy saving and efficiency improvement.

[0039] In the above embodiments, a sealing mechanism is provided on the main body 1 to block the airflow channel 2. Preferably, as the rotation speed of the fan blade 3 gradually increases, the sealing mechanism gradually opens the airflow channel 2, and as the rotation speed of the fan blade 3 gradually decreases, the sealing mechanism gradually closes the airflow channel 2. Specifically, when the fan blades 3 rotate to drive the air in the airflow channel 2 to be discharged outward, the air flow rate in the airflow channel 2 varies with the rotation speed of the fan blades 3. When the rotation speed of the fan blades 3 is low, the air flow rate in the airflow channel 2 is small. At this time, the sealing mechanism opens the vent 7 to a small extent, and the cross-section of the vent 7 available for air flow is small, so the wind speed at the vent 7 is large (when the air flow rate is constant, the cross-section and the air flow rate are inversely proportional). In this way, a large air flow rate can be maintained at the vent 7 when the fan speed is low, and impurities and insects can be prevented from flowing back into the rice bin as much as possible; when the fan blades 3 are stable and rotate at high speed, the sealing mechanism opens the vent 7 to the maximum extent. At this time, the high-speed rotating fan blades 3 can maintain a large air flow rate in the airflow channel 2 and the vent 7, and can also prevent impurities and insects from flowing back into the rice bin as much as possible.

[0040] In another embodiment provided by the present invention, a blocking mechanism is provided at both ends of the main body 1. Specifically, in this embodiment, a blocking mechanism is provided at both sides of the airflow channel 2, and the two sets of blocking structures operate synchronously, and the two ends of the airflow channel 2 can be blocked respectively by the two sets of blocking mechanisms. When a sealing problem occurs in one set of blocking mechanisms, the other set of blocking mechanisms can still keep blocking the airflow channel 2, thereby further improving the sealing of the airflow channel 2.

[0041] Furthermore, in the flow direction of the air, the speed at which the blocking mechanism located upstream opens the airflow channel 2 is lower than the speed at which the blocking mechanism located downstream opens the airflow channel 2, so that in the process of the two groups of blocking mechanisms opening the airflow channel 2, the air flow rate upstream of the airflow channel 2 is higher than the air flow rate downstream. In the process of the two groups of blocking mechanisms closing the airflow channel 2, the speed at which the blocking mechanism located upstream closes the airflow channel 2 is lower than the speed at which the blocking mechanism located downstream closes the airflow channel 2, so that in the process of the two groups of blocking mechanisms closing the airflow channel 2, the air flow rate upstream of the airflow channel 2 is lower than the air flow rate downstream. Specifically, in the present embodiment, two motor structures are used to respectively drive the two drive rings 8 to rotate, thereby adjusting the degree to which the two blocking mechanisms open the vents 7; when the fan blades 3 start to rotate, one motor structure is used to drive the upstream blocking mechanism to slowly open the corresponding vents 7 (that is, to drive the corresponding drive ring 8 to rotate slowly), and at the same time, another motor structure is used to drive the downstream blocking mechanism to quickly (relative to the speed at which the other blocking mechanism opens the vents 7) open the corresponding vents 7, so that when the fan blades 3 start to rotate, the upstream vents 7 can be kept at a smaller opening degree, while the downstream vents 7 can be kept at a larger opening degree, and when the fan blades 3 rotate to drive the air in the airflow channel 2 to be discharged outward, the airflow If the air flow in the air flow channel 2 is certain, the air flow rate at the position with a larger cross-section in the air flow channel 2 is smaller, and the air flow rate at the position with a smaller cross-section in the air flow channel 2 is larger. Since the degree of opening at the upstream air vent 7 is smaller than the degree of opening at the downstream air vent 7, the air flow rate at the upstream air vent 7 is greater than the air flow rate at the downstream air vent 7; conversely, when the fan blade 3 is about to stop rotating, the two blocking mechanisms are controlled again by the two motor structures to make the degree of opening at the upstream air vent 7 greater than the degree of opening at the downstream air vent 7 (the blocking speed of the upstream blocking mechanism is smaller, and the degree of opening at the upstream air vent 7 is larger), so that the air flow rate at the upstream air vent 7 is smaller than the air flow rate at the downstream vent 7.

[0042] The advantage of such an arrangement is that, at the beginning of the rotation of the fan blades 3, the two blocking mechanisms gradually open the two vents 7, and the speed at which the upstream blocking mechanism opens the corresponding vent 7 is relatively slow, so that the air flow rate in the upstream of the air flow channel 2 is relatively large, so that the larger air flow rate and the vent 7 with a smaller opening degree can be used to prevent impurities and insects from flowing back through the upstream vent 7 and entering the rice bin; as the rotation speed of the fan blades 3 increases, the two blocking mechanisms gradually open the corresponding vents 7 until the fan blades 3 rotate stably and at a high speed, and the two blocking mechanisms basically fully open the two vents 7. At this time, the air flow rate in the air flow channel 2 is relatively large, and impurities and insects can be prevented from flowing back into the rice bin as much as possible; because when the blocking mechanism is opened, the downstream vent 7 is opened to a greater extent and the air flow rate is relatively small, so that foreign impurities and insects may enter the air flow channel 2. For this reason, in the process from when the fan blades 3 are about to stop rotating to when they stop rotating, the two blocking mechanisms are gradually closed. vents 7, and the speed at which the downstream blocking mechanism blocks the corresponding vents 7 is faster, so that the degree of opening of the downstream vents 7 is smaller, then the air flow rate in the downstream of the air flow channel 2 is larger, so that the larger air flow rate can be used to discharge impurities and insects in the air flow channel 2 from the air flow channel 2, until the fan blades 3 stop rotating, the two blocking mechanisms completely close the two vents 7 to isolate the rice bin from the outside world; when the fan blades 3 are about to stop and still keep rotating at a high speed, the two blocking mechanisms begin to block the two vents 7 to reduce the cross-section of the vents 7 for air to pass through when the air flow is large, thereby increasing the air flow rate at the vents 7 (compared to the air flow rate when the fan blades 3 rotate at a high speed and the vents 7 are opened to the maximum), further increasing the effect of removing impurities and insects; correspondingly, after the fan blades 3 are started and keep rotating at a high speed, the two blocking mechanisms continue to open the two vents 7 to maintain a larger air flow rate at the vents 7.

[0043] As an alternative solution for the above two motor structures to drive the two blocking mechanisms to operate, preferably, the main body 1 is rotatably connected to two rotating wheels 10, the two rotating wheels 10 are coaxially fixed, and a connecting column 11 is fixed on the side of the two rotating wheels 10 that is away from each other ( Figure 8-Figure 11In the figure, the position of the connecting column 11 above the upper rotating wheel 10 is shown, and the position of the connecting column 11 below the lower rotating wheel 10 is shown by the dotted line. Two driving rods 12 are hinged on the main body 1. Both driving rods 12 are configured with through grooves 13. The two connecting columns 11 are respectively slidably connected in the two through grooves 13. The hinge points of the two driving rods 12 and the main body 1 are respectively located on both sides of the rotating wheel 10. One end of the driving rod 12 is hinged to the main body 1 and the hinge point is located on one side of the rotating wheel 10. The other end of the driving rod 12 is located on the other side of the rotating wheel 10 and is transmission-connected to the driving ring 8 on the other side. Specifically, the through groove 13 is arranged along the length direction of the driving rod 12; the connecting column 11 is fixed on the side of the corresponding rotating wheel 10 away from the other rotating wheel 10, and there is a certain gap between the two rotating wheels 10 and the gap in the middle is used for rotational connection with the main body 1, so as to avoid the two driving rods 12 from interfering with the rotating axis of the rotating wheel 10 when rotating with the rotating wheel 10; if an extension portion is constructed on the main body 1, the extension portion extends between the two rotating wheels 10 so that the two rotating wheels 10 are rotationally connected to the main body 1.

[0044] like Figure 8 As shown, the upper part is the upstream of the air flow channel 2, and the lower part is the downstream of the air flow channel 2. At this time, the two rotating wheels 10 are in the initial position, the upper connecting column 11 is located in the through groove 13 of the upper driving rod 12 (the hinge point with the main body 1 is the upper driving rod 12), and the lower connecting column 11 is located in the through groove 13 of the lower driving rod 12 (the hinge point with the main body 1 is the lower driving rod 12). At this time, the end of the upper driving rod 12 away from the main body 1 is at the rightmost end of its stroke (at this time, the connecting line between the rotating wheel 10 and the connecting column 11 is perpendicular to the length direction of the through groove 13) and is transmission-connected with the driving ring 8 in the lower driving mechanism (the moving trajectory of the end of the driving rod 12 away from the main body 1 is an arc, and the rotating trajectory of the driving ring 8 is also an arc, for this purpose, a connecting rod structure or a gear rotating structure can be set between the two for transmission connection), the end of the lower driving rod 12 away from the main body 1 is at the rightmost end of its stroke and is transmission-connected with the driving ring 8 in the upper driving mechanism, and the vents 7 in the two driving mechanisms are both in a state of being blocked by the arc plate 6; as shown in FIG. Fig. 9 As shown, as the rotating wheel 10 rotates 90 degrees counterclockwise, the two connecting columns 11 can contact the inner wall of the corresponding through groove 13 and force the corresponding driving rod 12 to rotate. At this time, the rotation angle of the upper driving rod 12 is greater than the rotation angle of the lower driving rod 12, and the upper driving rod 12 can drive the lower driving ring 8 to rotate a larger angle, so that the opening degree of the downstream vent hole 7 is greater than the opening degree of the upstream vent hole 7, and then the upstream of the air flow channel 2 has a larger air flow rate to adapt to the process when the fan blade 3 starts to rotate; Fig.10As shown, as the rotating wheel 10 continues to rotate counterclockwise by 90 degrees, at this time, the angles of the two driving rods 12 are the same, that is, the angles of the two driving rings 8 are the same, so that the two vents 7 are in the same state with a large degree of opening to adapt to the stable and high-speed rotation of the fan blades 3; Fig.11 As shown, as the rotating wheel 10 continues to rotate 90 degrees counterclockwise, the two driving rods 12 begin to reset to drive the corresponding driving rings 8 to reset, thereby blocking the corresponding air holes 7. During the process, the rotation angle of the upper driving rod 12 is greater than the rotation angle of the lower driving rod 12. The upper driving rod 12 can drive the lower driving ring 8 to rotate a larger angle, so that the degree of closure of the downstream air holes 7 is greater than the degree of closure of the upstream air holes 7, thereby making the air flow rate downstream of the air flow channel 2 greater to adapt to the process of the fan blade 3 gradually decreasing in speed; finally, the rotating wheel 10 continues to rotate 90 degrees counterclockwise to reset to the initial position. At this time, the two air holes 7 can be blocked by the two driving rods 12 and the two driving rings 8 to isolate the rice bin from the outside world when the fan blade 3 stops rotating.

[0045] With such arrangement, during the rotation of the rotating wheel 10, in the first half of the rotation (i.e., during the rotation of the rotating wheel 10 by 180 degrees from the initial position), the speed at which one of the driving rods 12 drives the corresponding driving ring 8 to rotate is greater than the speed at which the other driving rod 12 drives the corresponding driving ring 8 to rotate, and in the second half of the rotation, the speed at which the other driving rod 12 drives the corresponding driving ring 8 to reset is less than the speed at which one driving rod 12 drives the corresponding driving ring 8 to reset. The advantage is that during the rotation of the rotating wheel 10, the two vents 7 are opened and closed; when the vents 7 are opened, the upstream blocking mechanism opens the vents 7 at a slower speed, so that the upstream vents 7 have a larger air flow rate; when the vents 7 are closed, the downstream blocking mechanism closes the vents 7 at a faster speed, so that the downstream vents 7 have a larger air flow rate; and the airflow channel 2 and external impurities (or insects) are prevented from flowing back into the rice bin as much as possible.

[0046] Preferably, a connecting frame 14 is fixed on the main body 1, and the connecting frame 14 extends between the two rotating wheels 10 and is rotatably connected to the two rotating wheels 10, and the two driving rods 12 are hinged on the connecting frame 14. Specifically, the connecting frame 14 is constructed in an "n" shape as a whole, and both ends of the connecting frame 14 are fixed on the outer wall of the main body 1; two connecting parts 15 are constructed on the connecting frame 14, and the two driving rods 12 are respectively hinged on the two connecting parts 15; there is a certain space between the connecting frame 14 and the main body 1, one rotating wheel 10 and one driving rod 12 are located in the space between the connecting frame 14 and the main body 1, and the other rotating wheel 10 and the other driving rod 12 are located on the side of the connecting frame 14 away from the main body 1, so that the two rotating wheels 10 can respectively drive the two driving rods 12 to rotate when rotating, and try to avoid the rotating shafts of the rotating wheels 10 and the driving rods 12 from interfering with the operation of the device.

[0047] The driving source of the rotating wheel 10 can be set on the connecting frame 14, such as a combination of a driving motor 18 and a pulley transmission structure. Preferably, the driving motor 18 is fixed on one side of the connecting frame 14, and a pulley transmission structure is selected between the output end of the driving motor 18 and the rotating wheel 10 located on the side of the connecting frame 14 away from the main body 1, so that the two rotating wheels 10 are driven to rotate by the driving motor 18, and the driving source arranged in this way will not interfere with the rotation of the two driving rods 12; in this embodiment, the driving motor 18 operates based on the rotation speed of the fan blades 3, and a speed sensor can be set in the main body 1 to receive the signal of the speed sensor through a control panel and other structures and control the operation of the driving motor 18. This is a prior art and will not be repeated here.

[0048] As a preferred solution for the transmission connection between the driving rod 12 and the corresponding driving ring 8, a hinged rod 16 is provided between the driving rod 12 and the corresponding driving ring 8, and the two ends of the hinged rod 16 are respectively hinged to the driving rod 12 and the driving ring 8. Figure 7 and Figure 8 As shown, a connecting groove 17 is constructed on the main body 1, so that the driving ring 8 can be exposed from the main body 1, one end of the hinged rod 16 is hinged to the end of the driving rod 12, and the other end extends into the connecting groove 17 and is hinged to the driving ring 8, and the driving rod 12 and the driving ring 8 are both hinged to the hinged rod 16 by a ball joint, so that the driving rod 12 can drive the driving ring 8 to rotate on the main body 1 during rotation, so that the two driving rings 8 can be driven to rotate by the rotating wheel 10.

[0049] exist Figures 8 to 10 During the process, the end of the upper driving rod 12 away from the main body 1 first moves to the leftmost end of its stroke and then resets to the right for a (short) distance. Figure 10 to Figure 11During the process, the end of the lower driving rod 12 away from the main body 1 first moves to the leftmost end of its stroke and then resets to the right for a (relatively short) distance; it should be noted that, during the process of the above-mentioned two driving rods 12 slightly resetting, the change in the degree of opening of the vent holes 7 is small. With this arrangement, when the rotating wheel 10 is in the initial position and rotates half a circle, the two vent holes 7 can maintain the same degree of opening.

[0050] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A ventilation circulation fan for a rice bin, comprising a main body, an air flow channel is constructed in the main body, and a fan blade is rotatably connected in the air flow channel, characterized in that: Also includes: The blocking mechanism opens the airflow channel when the fan blades rotate so that the airflow channel is connected to the rice bin; when the fan blades stop rotating, the blocking mechanism closes the airflow channel.

2. A ventilation circulation fan for a rice bin according to claim 1, characterized in that: The blocking mechanism comprises a fixing ring fixed on the main body, a vent hole is formed on the fixing ring, and a plurality of arc plates are rotatably connected to the fixing ring. The plurality of arc plates can block the vent hole when they rotate toward the center of the fixing ring at the same time.

3. A ventilation circulation fan for a rice bin according to claim 2, characterized in that: The blocking mechanism also includes a driving ring rotatably connected to the main body, a plurality of connecting rods are hinged on the driving ring, and the plurality of connecting rods are respectively hinged to the plurality of arc-shaped plates.

4. A ventilation circulation fan for a rice bin according to claim 3, characterized in that: In the process of gradually increasing the rotation speed of the fan blades, the blocking mechanism gradually opens the airflow channel, and in the process of gradually decreasing the rotation speed of the fan blades, the blocking mechanism gradually closes the airflow channel.

5. A ventilation circulation fan for a rice bin according to claim 1 or 4, characterized in that: Both ends of the main body are provided with blocking mechanisms.

6. A ventilation circulation fan for a rice bin according to claim 5, characterized in that: In the flow direction of the air, the speed at which the upstream blocking mechanism opens the airflow channel is lower than the speed at which the downstream blocking mechanism opens the airflow channel, so that in the process of the two groups of blocking mechanisms opening the airflow channel, the air flow rate upstream of the airflow channel is higher than the air flow rate downstream.

7. A ventilation circulation fan for a rice bin according to claim 6, characterized in that: In the process of the two groups of sealing mechanisms closing the airflow channel, the speed at which the upstream sealing mechanism closes the airflow channel is lower than the speed at which the downstream sealing mechanism closes the airflow channel, so that in the process of the two groups of sealing mechanisms closing the airflow channel, the air flow rate upstream of the airflow channel is lower than the air flow rate downstream.

8. A ventilation circulation fan for a rice bin according to claim 7, characterized in that: Two rotating wheels are rotatably connected to the main body, and the two rotating wheels are coaxially fixed. A connecting column is fixed on the side of the two rotating wheels that are away from each other. Two driving rods are hinged on the main body, and the two driving rods are each constructed with a through groove. The two connecting columns are slidably connected in the two through grooves respectively.

9. A ventilation circulation fan for a rice bin according to claim 8, characterized in that: The hinge points of the two driving rods and the main body are respectively located on both sides of the rotating wheel. One end of the driving rod is hinged to the main body and the hinge point is located on one side of the rotating wheel. The other end of the driving rod is located on the other side of the rotating wheel and is transmission-connected to the driving ring on the other side.

10. A ventilation circulation fan for a rice bin according to claim 9, characterized in that: When the rotating wheel rotates one circle, in the first half of the circle, the speed at which one driving rod drives the corresponding driving ring to rotate is greater than the speed at which the other driving rod drives the corresponding driving ring to rotate, and in the second half of the circle, the speed at which the other driving rod drives the corresponding driving ring to reset is less than the speed at which one driving rod drives the corresponding driving ring to reset.

Images