Air duct switching mechanical interlocking device of heat pump type dryer

Abstract

The invention relates to the technical field of heat pump dryer air duct switching, in particular to a heat pump type dryer air duct switching mechanical interlocking device which comprises a mounting rod used in cooperation with a drying room, a heat pump machine and a fan, multiple sets of rotating shafts rotationally connected to the mounting rod, air guide plates fixedly connected to the rotating shafts and multiple sets of chains arranged between the rotating shafts. The device comprises a drying room, a plurality of sets of motors arranged at the top of the drying room, a clamping assembly arranged on a mounting rod, a limiting assembly arranged on the mounting rod, and a compensation assembly arranged on the limiting assembly. The limiting assembly can continuously twist, limit and fix the rotating shaft of the air deflector to prevent the air deflector from shaking, and the compensation assembly can increase the contact area between the limiting assembly and airflow.

Description

Technical Field

[0001] The present invention relates to the technical field of air duct switching of heat pump dryers, and specifically to a mechanical interlock device for air duct switching of a heat pump dryer. Background Art

[0002] The working principle of a water source heat pump dryer is based on the reverse Carnot cycle. Using water source heat pump technology, by absorbing the geothermal energy of water bodies (such as groundwater, river water, etc.), combined with the work of the compressor and waste heat recovery, the heat is transferred to the drying area. Compared with traditional electric heating drying or coal drying, it has significant energy-saving effects and important environmental protection significance, and is suitable for the drying operations of agricultural products such as tea, fruits and vegetables, and various dried goods.

[0003] In the drying operation of agricultural products in a drying room using water source heat pump technology, the evaporator is used to absorb the heat in the water source, causing the refrigerant to evaporate into a low-temperature and low-pressure gas. Then, the compressor is used to compress the low-temperature and low-pressure gas into a high-temperature and high-pressure gas. Then, the heated dry air is sent into the drying room through a fan to dry the materials. When in use, the materials are first moved into the drying room, and the hot air is discharged through the fan on one side of the drying room and absorbed by the fan on the other side. After a period of time, the rotation directions of the two fans are switched to ensure uniform drying. During the drying process of agricultural products, the required air duct angles for hanging materials (such as tobacco leaves) and flat-laid materials (such as sheet-shaped fruits and vegetables) are different. Hanging materials are more suitable for vertical air ducts, allowing the air flow to pass through the vertical space between the hanging materials. Flat-laid materials are more suitable for flat-flow air ducts, and the material surface is evenly covered by horizontal air supply. Therefore, when drying different materials, the air duct needs to be switched. The existing switching method is to connect the air guide plates at the fans in the drying room with chains, and then drive the air guide plates to rotate from vertical to horizontal by a motor to complete the switching.

[0004] However, during the use process, due to the meshing clearance existing in chain drive (usually 0.5 - 1.2 mm), the air guide plates will vibrate during the high-speed drying process. And after long-term use, the chain will show a slight slack, and thus the error will gradually increase during the transmission process, resulting in the horizontal or vertical adjacent air guide plates not being on the same horizontal line after switching. The existing technical solutions will avoid these problems by means of manual regular inspection and maintenance. However, the manual inspection method requires the disassembly of the drying machinery, which is time-consuming and laborious and will seriously affect the drying efficiency.

[0005] Therefore, a mechanical interlock device for air duct switching of a heat pump dryer is proposed. Summary of the Invention

[0006] The object of the present invention is to provide a mechanical interlock device for air duct switching of a heat pump dryer, which solves the problems that due to the meshing clearance of chain drive, the air deflector will vibrate during the high-speed drying process, and the air deflectors adjacent horizontally or vertically are likely to be not on the same horizontal line after switching. By setting the clamping assembly, it can be ensured that the angle of each air deflector switching is maintained at 90 degrees, and under the high-speed operation of the fan, the limiting assembly can further limit and fix the rotating shaft of the air deflector to prevent the air deflector from vibrating.

[0007] To achieve the above object, the present invention provides the following technical solutions: A mechanical interlock device for air duct switching of a heat pump dryer, including a mounting rod used in cooperation with a drying room, a heat pump machine and a fan, multiple groups of rotating shafts rotatably connected to the mounting rod, air deflectors fixedly connected to the rotating shafts, multiple groups of chains arranged between the rotating shafts, and multiple groups of motors arranged on the top of the drying room. It also includes a clamping assembly arranged on the mounting rod, a limiting assembly arranged on the mounting rod, and a compensation assembly arranged on the limiting assembly; the clamping assembly is located on both sides of the rotating shaft and cooperates with the motor to make the rotating shaft rotate 90 degrees each time; the limiting assembly is located below the rotating shaft and swings with the air flow to limit the rotating shaft; the compensation assembly is used to increase the contact area between the limiting assembly and the air flow.

[0008] Preferably, a group of chains are connected between every two groups of the rotating shafts in the vertical direction; a group of clamping assemblies are provided at each group of rotating shafts; every two groups of the rotating shafts share a group of limiting assemblies; the motor drives the rotation of the topmost rotating shaft of the mounting rod through the chain, and then the topmost rotating shaft drives the lower rotating shafts to rotate at the same angle through the chain again. The clamping assembly is set to ensure that each group of rotating shafts rotates 90 degrees each time, preventing the error of the rotating angle of the rotating shaft during the transmission process caused by the meshing clearance between the chain and the sprocket.

[0009] Preferably, a rectangular clamping rod is arranged on the rotating shaft; the rectangular clamping rod is in the shape of a cube, and the four corners are provided with arcs; the arc design at the corners can reduce the resistance between the rectangular clamping rod and the clamping assembly during rotation.

[0010] Preferably, the clamping assembly includes a sliding groove opened on the mounting rod, a clamping plate slidably connected to the sliding groove, and a spring arranged between the sliding groove and the clamping plate; the clamping plate is located on both sides of the rectangular clamping rod; when the output shaft of the motor drives the rotation of the rotating shaft through the chain, since the rectangular clamping rod is a cube, the clamping plate will position and limit the rotating shaft through the thrust of the spring, so that the rotation angle of the rotating shaft is maintained at 90 degrees each time.

[0011] Preferably, the limiting component includes a first limiting groove and a second limiting groove formed on the rotating shaft, a bolt slidably connected to the mounting rod, an abutting block fixedly connected to the bolt, a rectangular channel formed on the mounting rod, a movable notch provided at the top of the rectangular channel, a blocking rod fixedly connected to the movable notch, a swing plate rotatably connected to the rectangular channel, and two sets of convex blocks fixedly connected to the swing plate; the two sets of convex blocks are symmetrically arranged with respect to the center line of the swing plate in the vertical state; the bottom of the bolt is located in the middle position between the two sets of convex blocks; when the air flow blows from the right side to the left side of the swing plate, the air flow will blow the swing plate to deflect to the left along the connecting axis, and at this time, the convex block on the left side of the swing plate will push the bolt upward to be inserted into the first limiting groove. When the air flow blows from the left side to the right side of the swing plate, the swing plate will deflect to the right, and at this time, the convex block on the right side of the swing plate will push the bolt upward to be inserted into the first limiting groove. When the air deflector is in the vertical state, the bolt can be inserted into the second limiting groove, which can prevent the air deflector from shaking during the working process.

[0012] Preferably, the top of the bolt is arc-shaped, and the radian is the same as that of the rotating shaft, and the top corners of the bolt are rounded; when the swing plate swings slightly and pushes the bolt to move slightly upward, it will not prevent the rotation of the rotating shaft. When the swing plate swings slightly and the rotating shaft rotates at this moment, the edge of the first limiting groove or the second limiting groove will push the bolt out of the first limiting groove or the second limiting groove through the arc at the top of the bolt, so that the swing plate maintains a vertical state.

[0013] Preferably, the swing plate is located on the left side of the central axis of the rectangular channel; since the swing plate is located on the left side of the central axis of the rectangular channel, most of the two sides of the swing plate are still inside the rectangular channel when the swing plate deflects to the right.

[0014] Preferably, the compensation component includes multiple sets of air funnels fixedly connected to the left side of the swing plate, and multiple sets of through grooves formed on the swing plate; each set of through grooves is communicated with each set of air funnels; when the air flow blows from the left side to the right side of the swing plate, the air funnels can increase the contact area between the swing and the air flow. Coupled with the suction effect of the fan on the right side of the swing plate, it can ensure that the swing plate can still be blown by the air flow to deflect. After the air flow passes through the air funnels, it will also flow out along the through grooves to both sides of the swing plate. Furthermore, the air flow discharged from the through grooves at this time can wash the side walls of the rectangular channel, preventing dust on the dried material from adhering and accumulating on the side walls of the rectangular channel.

[0015] Preferably, the distance that the air funnels extend out on the swing plate gradually increases from top to bottom; furthermore, when the air flow blows from the left side to the side of the swing plate, after the swing plate deflects, the closer the air funnel is to the lower part, the larger the contact area with the air flow, and thus the thrust generated by the air flow can act on the swing plate more effectively, and the air funnels near the upper part will not block the contact between the lower air funnels and the air flow.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. After the output shaft of the motor drives the rotating shaft to rotate through a chain, since the rectangular clamping rod is a cube, the clamping plate will positionally limit the rotating shaft through the thrust of the spring, so that the rotation angle of the rotating shaft remains 90 degrees each time, thereby preventing the rotation angle of the rotating shaft from deviating due to the meshing clearance between the chain and the sprocket, resulting in the air guide plates not being in a straight line after the angle is adjusted by the motor drive.

[0017] 2. When the present invention performs drying operations on flat materials, the air guide plates are in a horizontal state. When the air flow blows from one side of the partition along the right side of the swing plate to the left side, the swing plate will deflect to the left along the connecting shaft. At this time, the convex block on the left side of the swing plate will push the bolt upward to be inserted into the first limiting groove. When the air flow reaches the other side of the drying chamber partition and blows from the left side of the swing plate to the right side of the swing plate, the swing plate will deflect to the right. At this time, the convex block on the right side of the swing plate will push the bolt upward to be inserted into the first limiting groove. When the air guide plates are in a vertical state and continue to perform drying operations on hanging materials, the bolt can also be driven to be inserted into the second limiting groove. Thus, no matter how the fan switches the rotation direction, the swing plate can push the bolt to be inserted into the first limiting groove or the second limiting groove to lock the air guide plates, preventing the air guide plates from shaking during the drying process. Moreover, due to the arc setting at the top corners of the bolt, when the swing plate makes a slight swing and the rotating shaft rotates at this moment, the edge of the first limiting groove or the second limiting groove will push the bolt out of the first limiting groove or the second limiting groove through the arc at the top of the bolt, preventing the slight shaking of the swing plate from affecting the angle switching of the air guide plates.

[0018] 3. When the air flow blows from the left side to the right side of the swing plate, the setting of the air hopper can increase the contact area between the swing and the air flow to make up for the weakening of the wind force. Coupled with the suction effect of the fan on the right side of the swing plate, it can ensure that the swing plate can still be blown by the air flow to deflect. After the air flow passes through the air hopper, it will also flow out along the through groove to both sides of the swing plate, flushing the side walls of the rectangular channel, preventing the dust on the materials to be dried from adhering and accumulating on the side walls of the rectangular channel, resulting in the swing plate being stuck by the accumulated dust and unable to reset during the swinging process. And since the extending distance of the air hopper on the swing plate gradually increases from top to bottom, when the air flow blows from the left side to the side of the swing plate and the swing plate deflects, the closer the air hopper is to the lower part, the larger the contact area with the air flow, and thus the thrust generated by the air flow can act on the swing plate more effectively. Moreover, the air hopper with a short extending distance near the upper part can avoid blocking the contact between the lower air hopper and the air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall external structure of the present invention; Figure 2 is a schematic diagram of the internal structure of the drying chamber of the present invention; Figure 3Cross-sectional view of the installation rod of the present invention; Figure 4 Schematic structural diagram of the clamping assembly of the present invention; Figure 5 Enlarged view of the air guide plate of the present invention; Figure 6 Plan view of the limiting assembly of the present invention; Figure 7 Plan view of the bolt of the present invention; Figure 8 Schematic three-dimensional structural diagram of the compensation assembly of the present invention; Figure 9 Side cross-sectional view of the compensation assembly of the present invention.

[0020] In the figure: 1, drying room; 11, installation rod; 12, rotating shaft; 121, rectangular clamping rod; 13, air guide plate; 14, chain; 15, motor; 2, heat pump; 3, fan; 4, clamping assembly; 41, sliding groove; 42, clamping plate; 43, spring; 5, limiting assembly; 51, first limiting groove; 52, second limiting groove; 53, bolt; 54, abutting block; 55, rectangular channel; 56, movable notch; 57, blocking rod; 58, swinging plate; 59, convex block; 6, compensation assembly; 61, air scoop; 62, through groove. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 to 9 , the present invention provides a mechanical interlock device for air duct switching of a heat pump dryer, and the technical solution is as follows: As an implementation manner of the present invention, refer to Figures 1 to 3, A mechanical interlock device for air duct switching of a heat pump dryer, including a mounting rod 11 used in cooperation with a drying room 1, a heat pump unit 2, and a fan 3, multiple groups of rotating shafts 12 rotatably connected to the mounting rod 11, air guide plates 13 fixedly connected to the rotating shafts 12, multiple groups of chains 14 arranged between the rotating shafts 12, and multiple groups of motors 15 arranged on the top of the drying room 1. It also includes a clamping assembly 4 arranged on the mounting rod 11, a limiting assembly 5 arranged on the mounting rod 11, and a compensation assembly 6 arranged on the limiting assembly 5; the clamping assembly 4 is located on both sides of the rotating shaft 12 and cooperates with the motor 15 to make the rotating shaft 12 rotate 90 degrees each time; the limiting assembly 5 is located below the rotating shaft 12 and swings with the air flow to limit the rotating shaft 12; the compensation assembly 6 is used to increase the contact area between the limiting assembly 5 and the air flow; when in use, the water source heat pump unit 2 generates heat and is blown into the drying room 1 by the fan 3 to perform drying operations on the materials in the drying room 1. A partition is provided in the middle of the drying room 1 to divide the drying room 1 into two parts. During operation, the fan 3 on one side of the partition blows hot air into the drying room 1, and the fan 3 on the other side of the partition exhausts the air flow in the drying room 1 out of the drying room 1, thereby realizing the circulating flow of the air flow in the drying room 1. In order to make the drying effect of the materials uniform, the fans 3 on both sides of the partition will switch the rotation direction after working for a period of time to make the air flow in the drying room 1 flow in the opposite direction. At the same time, in order to meet the different requirements of the air ducts for hanging materials and laying materials, when drying laying materials, the motor 15 will drive the chain 14 to drive the longitudinally arranged air guide plates 13 on the mounting rod 11 to rotate to the horizontal state, so as to form a horizontal air duct between the air guide plates 13. When drying hanging materials, the motor 15 will drive the chain 14 to drive the air guide plates 13 to rotate 90 degrees, so as to form a vertical air duct between the air guide plates 13. During the rotation of the air guide plates 13, the clamping assembly 4 can make the rotating shaft 12 rotate 90 degrees each time, preventing the deviation of the rotation angle, resulting in the air guide plates 13 not being in a straight line, causing unstable air flow. And in the working state, the air flow generated by the fan 3 will push the limiting assembly 5 to lock the rotating shaft 12, preventing the deflector from shaking when the wind speed is too high. When the air flow stops, the limiting assembly 5 will automatically release the lock on the rotating shaft 12, and then the motor 15 can be started to adjust the angle of the air guide plates 13 to switch the air duct. And when the air flow blows from the left side to the right side of the limiting assembly 5, the compensation assembly 6 can increase the contact area with the air flow to ensure that the air flow can push the limiting assembly 5 to lock the rotating shaft 12. At the same time, after the air flow passes through the compensation assembly 6, it can also perform dust cleaning operations on the position where the limiting assembly 5 is located, preventing dust accumulation from causing the limiting assembly 5 to operate smoothly.

[0023] As an implementation manner of the present invention, referring to Figures 1 to 3, there is a set of chain 14 connected between every two sets of the rotating shafts 12 in the vertical direction; there is a set of clamping components 4 at each set of rotating shafts 12; every two sets of the rotating shafts 12 share a set of limiting components 5; the motor 15 drives the rotation of the topmost rotating shaft 12 of the mounting rod 11 through the chain 14, and then the topmost rotating shaft 12 drives the lower rotating shafts 12 to rotate at the same angle through the chain 14 again. The clamping component 4 is set to ensure that each set of rotating shafts 12 rotates 90 degrees each time, preventing the rotation angle of the rotating shaft 12 from deviating during the transmission process due to the meshing clearance between the chain 14 and the sprocket. Since there is a chain 14 connected between every two sets of rotating shafts 12, after the limiting component 5 limits one set of rotating shafts 12, it can play a role in limiting the rotating shafts 12 connected by the same chain 14.

[0024] As an implementation manner of the present invention, referring to Figure 3 and Figure 5 , a rectangular clamping rod 121 is provided on the rotating shaft 12; the rectangular clamping rod 121 is in a cube shape, and the four corners are provided with arcs; when the rectangular clamping rod 121 rotates, the arc design at the corners can reduce the resistance between it and the clamping component 4 during the rotation process.

[0025] As an implementation manner of the present invention, referring to Figure 3 and Figure 4 , the clamping component 4 includes a sliding groove 41 opened on the mounting rod 11, a clamping plate 42 slidably connected to the sliding groove 41, and a spring 43 provided between the sliding groove 41 and the clamping plate 42; the clamping plate 42 is located on both sides of the rectangular clamping rod 121; when the output shaft of the motor 15 drives the rotation of the rotating shaft 12 through the chain 14, since the rectangular clamping rod 121 is a cube, the clamping plate 42 will limit the position of the rotating shaft 12 through the thrust of the spring 43, so that the rotation angle of the rotating shaft 12 is maintained at 90 degrees each time, thereby preventing the rotation angle of the rotating shaft 12 from deviating due to the meshing clearance between the chain 14 and the sprocket, resulting in the air deflector 13 not being in a straight line.

[0026] As an implementation manner of the present invention, referring to Figure 3 and Figure 6The limiting assembly 5 includes a limiting groove 1 51 and a limiting groove 2 52 provided on the rotating shaft 12, a latch 53 slidably connected to the mounting rod 11, an abutment block 54 fixedly connected to the latch 53, a rectangular channel 55 provided on the mounting rod 11, a movable notch 56 provided at the top of the rectangular channel 55, a blocking rod 57 fixedly connected to the movable notch 56, a swing plate 58 rotatably connected to the rectangular channel 55, and two groups of protrusions 59 fixedly connected to the swing plate 58; the two groups of protrusions 59 are symmetrically arranged about the center line of the swing plate 58 in the vertical state; the bottom of the latch 53 is located in the middle of the two groups of protrusions 59; when the air guide plate 13 is in the horizontal state, the airflow from the swing plate 58 When the air blows from the right side to the left side, the airflow will blow the swing plate 58 to deflect to the left along the connecting axis. At this time, the protrusion 59 on the left side of the swing plate 58 will push the latch 53 to move upward and plug into the limit groove 1 51. When the airflow blows from the left side of the swing plate 58 to the right side of the swing plate 58, the swing plate 58 will deflect to the right. At this time, the protrusion 59 on the right side of the swing plate 58 will push the latch 53 to move upward and plug into the limit groove 1 51. When the air guide plate 13 is in a vertical state, the latch 53 can be plugged into the limit groove 2 52, thereby achieving that no matter how the fan 3 switches the rotation direction, the swing plate 58 can push the latch 53 to plug into the limit groove 1 51 or the limit groove 2 52, thereby preventing the air guide plate 13 from shaking during operation.

[0027] As an embodiment of the present invention, refer to Figure 7 The top of the latch 53 is arc-shaped, the curvature is consistent with the curvature of the shaft 12, and the top corner of the latch 53 is arc-shaped; when the fan 3 is not in operation, the swing plate 58 will maintain a natural vertical state. At this time, the abutment block 54 on the latch 53 will abut against the blocking rod 57. The arc setting of the top corner of the latch 53 will not prevent the shaft 12 from rotating when the swing plate 58 swings slightly and pushes the latch 53 to move slightly upward. When the swing plate 58 swings slightly and the shaft 12 rotates at this moment, the edge of the limit slot 1 51 or the limit slot 2 52 will push the latch 53 out of the limit slot 1 51 or the limit slot 2 52 through the arc at the top of the latch 53, so that the swing plate 58 remains in a vertical state.

[0028] As an embodiment of the present invention, refer to Figure 6 , Figure 8 and Figure 9, the swing plate 58 is located on the left side of the central axis of the rectangular channel 55; the compensation assembly 6 includes multiple groups of wind funnels 61 fixedly connected to the left side of the swing plate 58, and multiple groups of through slots 62 formed in the swing plate 58; each group of the through slots 62 communicates with each group of the wind funnels 61; when the air flow blows from the left side to the right side of the swing plate 58, due to the presence of the middle partition in the drying chamber 1, the air flow reaches the swing plate 58 after flowing through a long path in the drying chamber 1, so the wind speed will be reduced at this time. The setting of the wind funnels 61 can increase the contact area between the swing and the air flow. Coupled with the suction effect of the fan 3 on the right side of the swing plate 58, it can ensure that the swing plate 58 can still be blown by the air flow and deflect. After the air flow passes through the wind funnels 61, it will still flow out along the through slots 62 to both sides of the swing plate 58. Since the swing plate 58 is located on the left side of the central axis of the rectangular channel 55, when the swing plate 58 deflects to the right, both sides of the through slots 62 can still be within the rectangular channel 55. Furthermore, the air flow discharged from the through slots 62 at this time can wash the side walls of the rectangular channel 55, preventing the dust on the material to be dried from adhering and accumulating on the side walls of the rectangular channel 55, resulting in the swing plate 58 being stuck by the accumulated dust and unable to reset during the swinging process.

[0029] As an implementation manner of the present invention, referring to Figure 8 and Figure 9 , the distance that the wind funnels 61 extend out on the swing plate 58 gradually increases from top to bottom; furthermore, when the air flow blows from the left side to the side of the swing plate 58, after the swing plate 58 deflects, the closer the wind funnels 61 are to the lower part, the larger the contact area with the air flow, and thus the thrust force generated by the air flow can be more effectively applied to the swing plate 58. And since the distance that the wind funnels 61 near the upper part extend out is less than that of the wind funnels 61 below, it can avoid blocking the contact between the wind funnels 61 below and the air flow.

[0030] Working principle: Referring to Figures 1 to 3 , when the output shaft of the motor 15 drives the rotating shaft 12 to rotate through the chain 14, since the rectangular clamping rod 121 is a cube, the clamping plate 42 will limit the position of the rotating shaft 12 through the thrust of the spring 43, so that the rotation angle of the rotating shaft 12 is maintained at ninety degrees each time, thereby preventing the deviation of the rotation angle of the rotating shaft 12 caused by the meshing clearance between the chain 14 and the gear disk, resulting in the air guiding plates 13 not being on a straight line; Referring to Figures 4 to 7, when drying flat materials, the air deflector 13 is in a horizontal state. At this time, when the air flow blows from one side of the partition along the right side of the swing plate 58 to the left side, the air flow will blow the swing plate 58 to deflect to the left along the connecting axis. At this time, the convex block 59 on the left side of the swing plate 58 will push the bolt 53 upward to be inserted into the first limiting groove 51. When the air flow reaches the other side of the partition of the drying chamber 1, it will blow from the left side of the swing plate 58 to the right side of the swing plate 58, and the swing plate 58 will deflect to the right. At this time, the convex block 59 on the right side of the swing plate 58 will push the bolt 53 upward to be inserted into the first limiting groove 51. When the air deflector 13 is in a vertical state and continues to dry the suspended materials, the bolt 53 can also be driven to be inserted into the second limiting groove 52. Thus, no matter how the fan 3 switches the rotation direction, the swing plate 58 can push the bolt 53 to be inserted into the first limiting groove 51 or the second limiting groove 52, preventing the air deflector 13 from shaking during the working process. When the fan 3 is in a non-working state, the swing plate 58 will maintain a natural vertical state. At this time, the abutting block 54 on the bolt 53 will abut against the blocking rod 57. The circular arc is set at the top corner of the bolt 53. When the swing plate 58 swings slightly and pushes the bolt 53 to move slightly upward, it will not prevent the rotating shaft 12 from rotating. When the swing plate 58 swings slightly and the rotating shaft 12 rotates at this moment, the edge of the first limiting groove 51 or the second limiting groove 52 will push the bolt 53 out of the first limiting groove 51 or the second limiting groove 52 through the circular arc at the top of the bolt 53, keeping the swing plate 58 in a vertical state. Thus, it can prevent the slight shaking of the swing plate 58 from affecting the angle switching of the air deflector 13; Refer to Figures 6 to 9 , when the air flow blows from the left side of the swing plate 58 to the right side, due to the existence of the middle partition in the drying chamber 1, the air flow flows through a long path in the drying chamber 1 before reaching the swing plate 58. Therefore, the wind speed will be reduced at this time. The setting of the air scoop 61 can increase the contact area between the swing and the air flow. Coupled with the suction effect of the fan 3 on the right side of the swing plate 58, it can ensure that the swing plate 58 can still be blown by the air flow to deflect. After the air flow passes through the air scoop 61, it will also flow out along the through groove 62 to both sides of the swing plate 58. Since the swing plate 58 is located on the left side of the central axis of the rectangular channel 55, both sides of the through groove 62 can still be within the rectangular channel 55 when the swing plate 58 deflects to the right. Thus, the air flow discharged from the through groove 62 at this time can scour the side wall of the rectangular channel 55, preventing the dust on the materials to be dried from adhering and accumulating on the side wall of the rectangular channel 55, resulting in the swing plate 58 being stuck by the accumulated dust and unable to reset during the swinging process; Refer to Figure 8 and Figure 9, since the distance that the air scoop 61 extends on the swing plate 58 gradually increases from top to bottom; thus, when the air flow blows from the left side of the swing plate 58 to the side, after the swing plate 58 deflects, the closer the air scoop 61 is to the lower part, the larger the contact area with the air flow, and thus the thrust force generated by the air flow can act on the swing plate 58 more effectively, and the air scoop 61 near the upper part will not block the contact between the air scoop 61 below and the air flow.

[0031] Even if we have provided specific embodiments of the present invention, it should be clear to those skilled in the art within this field that, as long as it does not violate the fundamental concept and purpose of the present invention, various changes, modifications, substitutions, and variations can be made to these embodiments. The scope of the present invention is not fixed, but is ultimately determined by the claims contained in the patent document and the equivalent technical solutions. In short, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical interlocking device for air duct switching of a heat pump dryer, comprising a mounting rod (11) used in cooperation with a drying room (1), a heat pump unit (2) and a fan (3), a plurality of rotating shafts (12) rotatably connected to the mounting rod (11), a wind guide plate (13) fixedly connected to the rotating shaft (12), a plurality of chains (14) arranged between the rotating shafts (12), and a plurality of motors (15) arranged on the top of the drying room (1), characterized in that: It further includes a clamping assembly (4) arranged on the mounting rod (11), a limiting assembly (5) arranged on the mounting rod (11), and a compensation assembly (6) arranged on the limiting assembly (5); the clamping assembly (4) is located on both sides of the rotating shaft (12) and cooperates with the motor (15) to limit the rotating shaft (12) to rotate 90 degrees each time; the limiting assembly (5) is located below the rotating shaft (12) and swings with the air flow to limit the rotating shaft (12); the compensation assembly (6) is used to increase the contact area between the limiting assembly (5) and the air flow.

2. The mechanical interlock device for air duct switching of a heat pump dryer according to claim 1, wherein: A set of chain (14) is connected between every two groups of the rotating shafts (12) in the vertical direction; a set of clamping assembly (4) is arranged at each group of the rotating shafts (12); every two adjacent groups of the rotating shafts (12) in the up-and-down direction share a set of limiting assembly (5).

3. The mechanical interlock device for air duct switching of a heat pump dryer according to claim 2, characterized in that: A rectangular clamping rod (121) is arranged on the rotating shaft (12); the rectangular clamping rod (121) is in the shape of a cube, and the four corners are rounded.

4. A mechanical interlock device for air duct switching of a heat pump dryer according to claim 3, characterized in that: The clamping assembly (4) includes a sliding groove (41) opened on the mounting rod (11), a clamping plate (42) slidably connected to the sliding groove (41), and a spring (43) arranged between the sliding groove (41) and the clamping plate (42); the clamping plate (42) is located on both sides of the rectangular clamping rod (121).

5. A mechanical interlock device for air duct switching of a heat pump dryer according to claim 4, characterized in that: The limiting assembly (5) includes a first limiting groove (51) and a second limiting groove (52) opened on the rotating shaft (12), a plug pin (53) slidably connected to the mounting rod (11), an abutting block (54) fixedly connected to the plug pin (53), a rectangular channel (55) opened on the mounting rod (11), a movable notch (56) arranged at the top of the rectangular channel (55), a blocking rod (57) fixedly connected to the movable notch (56), a swinging plate (58) rotatably connected to the rectangular channel (55), and two convex blocks (59) fixedly connected to the swinging plate (58); the two convex blocks (59) are symmetrically arranged with respect to the center line of the swinging plate (58) in the vertical state; the bottom of the plug pin (53) is located in the middle of the two convex blocks (59).

6. The mechanical interlock device for air duct switching of a heat pump dryer according to claim 5, characterized in that: The top of the plug pin (53) is arc-shaped, the arc is consistent with the arc of the rotating shaft (12), and the corners at the top of the plug pin (53) are rounded.

7. The mechanical interlock device for air duct switching of a heat pump dryer according to claim 6, characterized in that: The swinging plate (58) is located on the left side of the central axis of the rectangular channel (55).

8. A mechanical interlock device for air duct switching of a heat pump dryer according to claim 7, characterized in that: The compensation assembly (6) includes multiple air funnels (61) fixedly connected to the left side of the swinging plate (58), and multiple through slots (62) opened on the swinging plate (58); each through slot (62) communicates with each air funnel (61).

9. The mechanical interlock device for air duct switching of a heat pump dryer according to claim 8, characterized in that: The distance that the air funnel (61) extends out on the swinging plate (58) gradually increases from top to bottom.

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