Sealing device of axial flow fan
By designing a retractable sealing device and transparent insulation materials in the axial flow fan, poor sealing and air resistance problems are solved, good insulation performance and natural ventilation functions are achieved, and operating costs are reduced.
Patent Information
- Application Number
- CN202421044085.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The sealing performance of the axial flow fan is poor, the insulation performance is poor in winter, and the insufficient opening angle of the blinds leads to increased energy consumption. The fan automatically closes after it stops and cannot be used as a natural vent, which increases operating costs.
A sealing device including a sealing housing, a shrink sealing device and a boundary sealing device are designed to achieve a fully open or sealed state of the barrier by retractable barrier material and a motor-driven roller shutter or folding sheet, combining transparent insulation material and barrier Wind rod to improve sealing effect.
It realizes the air volume of the axial fan when working, and has good insulation performance in winter, reducing energy consumption, and can be used as a natural vent when the fan is stopped, reducing operating costs and preventing damage to the external environment.
Smart Images
Figure CN222277032U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of axial flow fan seals, and particularly relates to a sealing device for an axial flow fan. Background Art
[0002] The main components of an axial flow fan are a motor and a fan blade. The fan blade is driven to rotate by the output end of the motor. Axial flow fans are usually used for air circulation, long-distance air supply, and cooling and heat dissipation of centralized components, such as greenhouses, livestock houses, and factories. Since the exhaust port of an axial flow fan is exposed to the outdoors, if there are no proper isolation measures, rain, dust, etc. may drift in from the vents. Especially in northern regions, sand, snow, etc. may drift in, which may cause damage to the fan or damage to interior decoration; therefore, isolation of the exhaust port is crucial.
[0003] In the prior art, such as Figure 1 and Figure 2 As shown, by setting a shutter at the exhaust port, when the axial flow fan is working, the blades of the shutter are pushed by the push rod to rotate the blades of the shutter, and the wind energy generated by the axial flow fan is transmitted through the channels between the blades.
[0004] The prior art has at least the following problems:
[0005] 1. The sealing is not good and the thermal insulation performance is poor in winter. Generally, a separate sealing cover is used for sealing, which is labor-intensive and inconvenient.
[0006] 2. Because the opening angle of the blinds cannot reach 90 degrees, wind resistance will be generated, affecting ventilation volume and increasing energy consumption.
[0007] 3. After the fan stops, the shutters will automatically close and cannot be used as natural ventilation, increasing operating costs. Utility Model Content
[0008] The utility model provides a sealing device for an axial flow fan, aiming to solve the technical problems existing in the above-mentioned prior art that the shutters have poor sealing performance and poor thermal insulation performance in winter, and are generally sealed with a separate sealing cover, which is labor-intensive and inconvenient; the shutters cannot open at an angle of 90 degrees, which will produce wind resistance, affect ventilation volume and increase energy consumption; and the shutters will automatically close after the fan stops and cannot be used as natural vents, thereby increasing operating costs.
[0009] The utility model provides a technical solution to the above technical problems as follows: a sealing device for an axial flow fan, comprising: a sealing shell, a contraction sealing device and a boundary sealing device; the sealing shell is arranged at the end of the exhaust port of the axial flow fan in contact with the external environment, the interior of the sealing shell comprises a blocking part and a sealing part, the blocking part is a hollow structure connecting the exhaust port with the external environment, the contraction sealing device is contractedly arranged on the blocking part, the sealing part is arranged on the side of the blocking part, and the boundary sealing device comprises a plurality of sealing devices, and the plurality of sealing devices are evenly arranged on the sealing part.
[0010] The beneficial effects of the utility model are as follows: the utility model arranges the shrinking sealing device at the blocking part, and when the axial flow fan is working, the shrinking sealing device is retracted to make the blocking part unobstructed, and the air volume generated by the axial flow fan can flow through the blocking part, ensuring that the air volume is unobstructed. When the exhaust port needs to be sealed, the shrinking sealing device is placed to cover the blocking part, and a boundary sealing device is arranged around the blocking part to achieve a better sealing effect, thereby preventing the external environment from damaging the axial flow fan.
[0011] On the basis of the above technical solution, the present invention can also be improved as follows.
[0012] Furthermore, the above-mentioned shrinkage sealing device includes: a shrinkage rod, a shrinkage device, a blocking device, and a counterweight rod, the shrinkage rod is fixed to the top of the blocking part, one end of the blocking device is connected to the shrinkage rod, and the other end of the blocking device is connected to the counterweight rod, the shrinkage device is connected to the shrinkage rod, and the shrinkage rod acts on the blocking device to collect and place it.
[0013] The beneficial effect of adopting the above-mentioned further scheme is as follows: the utility model provides a retractable barrier material to enable the barrier part to be in a fully open, unobstructed state or a sealed state. The barrier material is collected and prevented by the cooperation of the retracting device and the retracting rod, thereby ensuring multiple reuse of the barrier material and convenient operation. By providing a counterweight rod at the bottom of the barrier material, the barrier device can be placed more conveniently during the placement of the barrier material due to the pull of the gravity of the counterweight rod.
[0014] Furthermore, the blocking device is a rolling curtain, and the retracting device is a first retracting motor that acts on the retracting rod to collect and place the rolling curtain.
[0015] The beneficial effect of adopting the above further scheme is: the utility model sets the blocking material as a whole piece of rolling curtain. When it needs to be collected, since one end of the rolling curtain is connected to the retraction rod, the retraction rod is rotated by the first retraction motor, and the retraction rod drives the rolling curtain around the retraction rod to collect the rolling curtain under the rotation condition. After the collection is completed, the first retraction motor stops running. At this time, the blocking part is in a fully open and unobstructed state, which is suitable for the operation of the axial flow fan or the use of the blocking part as a natural vent. When the blocking part needs to be sealed, the retraction rod is rotated in the opposite direction to the collection of the rolling curtain. At this time, the rolling curtain naturally falls downward under the drive of the counterweight rod. The first retraction motor stops running when the counterweight rod reaches the sealing position. At this time, the stretched rolling curtain completely blocks the blocking part, thereby achieving the sealing of the blocking part.
[0016] Furthermore, the above-mentioned rolling shutter includes a hinge plate and a soft rolling shutter piece made of soft material.
[0017] The beneficial effects of adopting the above-mentioned further scheme are as follows: the utility model uses a hinge plate or a soft plate as a rolling curtain, firstly, to facilitate the convolution to be wrapped around the retracting rod when being collected, and secondly, when placed, the rolling curtain can form a vertical plane driven by the counterweight rod, thereby avoiding the deformation of the rolling curtain caused by long-term bending and wrapping around the retracting rod.
[0018] Furthermore, the material of the above-mentioned roller blind is a transparent heat-insulating material.
[0019] The beneficial effect of adopting the above further solution is that the utility model can achieve the effect of heat preservation and light transmission by setting the roller blind as a transparent heat-insulating material, so that it can achieve a better sealing effect.
[0020] Furthermore, the above-mentioned blocking device is a folding sheet, which includes a retraction rope and multiple independent folding sheets. The retraction rope runs through all the folding sheets, and both ends are respectively connected to the retraction device and the counterweight rod. The retraction device is a second retraction motor for collecting and placing the retraction rope.
[0021] The beneficial effect of adopting the above further scheme is: the utility model sets the blocking material as a folding sheet. When it is necessary to collect, since all the folding sheets are penetrated by a retraction rope, one end of the retraction rope is connected to the counterweight rod, and the retraction rope is rotated by the second retraction motor. The retraction rope drives the counterweight rod to move upward under the rotation condition, so that the folding sheets are stacked until the folding sheets are stacked to the position of the retraction rod, and the collection of the folding sheets is completed. After the collection is completed, the second retraction motor stops running. At this time, the blocking part is in a fully open and unobstructed state, which is suitable for the operation of the axial flow fan or the use of the blocking part as a natural vent. When the blocking part needs to be sealed, the second retraction motor is operated in the opposite direction of the collection and folding unit. At this time, the retraction rope is in a relaxed state and naturally extends downward under the drive of the counterweight rod. The stacked folding sheets also begin to extend due to the drive of the counterweight rod. After the extension is completed, the blocking part is completely covered, thereby achieving the sealing of the blocking part.
[0022] Furthermore, the material of the folded single sheet is a transparent heat-insulating material.
[0023] The beneficial effect of adopting the above further solution is that the utility model can achieve the effect of heat preservation and light transmission by setting the folded single sheet as a transparent heat-insulating material, so that it can achieve a better sealing effect.
[0024] Furthermore, the sealing device mentioned above comprises a sealing groove and a sealing strip, and the sealing strip is arranged in the sealing groove.
[0025] The beneficial effect of adopting the above further solution is that the utility model provides a sealing device around the edge of the blocking part, thereby ensuring a better sealing effect when sealing the blocking part and better preventing the external environment from damaging the axial flow fan.
[0026] Furthermore, the number of the sealing devices is two, and the two sealing devices are respectively arranged on both sides of the blocking device that are not connected to the retractable rod or the counterweight rod.
[0027] The beneficial effect of adopting the above-mentioned further scheme is: since the two ends of the blocking device of the utility model are already provided with a retractable rod and a counterweight rod, and since the retractable rod is fixed to the top of the blocking part, the counterweight rod will naturally fit downward to the bottom of the blocking part due to the weight factor, and therefore there is no need to set a sealing device on the edge of the counterweight rod where the retractable rod is set, thereby providing sealing devices on both sides of the blocking device, saving materials for setting the sealing devices.
[0028] Furthermore, the blocking portion is also provided with a plurality of wind shielding rods, and the plurality of wind shielding rods are vertically and evenly arranged on one side of the blocking device.
[0029] The beneficial effect of adopting the above further scheme is: the utility model provides a windshield rod on one side of the blocking device to prevent the blocking material from shifting due to the influence of the external environment. Therefore, the windshield rod is provided to fix the blocking material to the blocking part, thereby better sealing the blocking part.
[0030] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a structural schematic diagram of the prior art of the utility model;
[0032] Figure 2 for Figure 1 A schematic diagram of the side structure of
[0033] Figure 3 A schematic structural diagram of a sealing device for an axial flow fan provided in Example 1 of the utility model;
[0034] Figure 4 A structural schematic diagram of a sealing device for an axial flow fan provided in Example 2 of the utility model;
[0035] Figure 5 This is a structural schematic diagram of the sealing groove provided by the utility model.
[0036] Reference numerals:
[0037] 1. Venetian blinds; 2. Roller blinds; 3. Counterweight rods; 4. Wind shield rods; 5. Retractable rods; 6. Sealed shells; 7. Folding single pieces; 8. Sealed grooves. DETAILED DESCRIPTION
[0038] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0039] like Figure 1 and Figure 2 As shown, in the prior art, a shutter 1 is provided at the exhaust port as a sealing device, but the shutter 1 has poor sealing performance and poor thermal insulation performance in winter. It is labor-intensive and inconvenient to add a separate sealing cover for sealing; the shutter 1 does not open at an angle of 90 degrees, which will cause wind resistance, affect ventilation volume and increase energy consumption; and the shutter 1 will automatically close after the fan stops and cannot be used as a natural vent, thereby increasing operating costs.
[0040] The following specific embodiments are used to describe in detail the technical solution of the utility model and how the technical solution of the utility model solves the above technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following embodiments of the utility model will be described in conjunction with the accompanying drawings.
[0041] Embodiment 1: The present invention provides a possible implementation method, such as Figure 2 As shown, a structural schematic diagram of a sealing device of an axial flow fan is provided, comprising: a sealing shell 6, a contraction sealing device and a boundary sealing device; the sealing shell 6 is arranged at the end of the exhaust port of the axial flow fan in contact with the external environment, the interior of the sealing shell 6 includes a blocking part and a sealing part, the blocking part is a hollow structure connecting the exhaust port with the external environment, the contraction sealing device is contractedly arranged in the blocking part, the sealing part is arranged on the side of the blocking part, and the boundary sealing device includes a plurality of sealing devices, and the plurality of sealing devices are evenly arranged in the sealing part.
[0042] Among them, the utility model arranges the shrinking sealing device on the blocking part. When the axial flow fan is working, the shrinking sealing device is retracted to make the blocking part unobstructed, and the air volume generated by the axial flow fan can flow through the blocking part, ensuring that the air volume is unobstructed. When the exhaust port needs to be sealed, the shrinking sealing device is placed to cover the blocking part, and a boundary sealing device is arranged around the blocking part to achieve a better sealing effect. Prevent the external environment from damaging the axial flow fan.
[0043] Optionally, the shrinkage sealing device includes: a shrinkage rod 5, a shrinkage device, a blocking device, and a counterweight rod 3, the shrinkage rod 5 is fixed to the top of the blocking part, one end of the blocking device is connected to the shrinkage rod 5, and the other end of the blocking device is connected to the counterweight rod 3, the shrinkage device is connected to the shrinkage rod 5, and acts on the shrinkage rod 5 to collect and place the blocking device.
[0044] Among them, the utility model arranges a retractable barrier material to make the barrier part in a fully open and unobstructed state or a sealed state. The barrier material is collected and prevented by the cooperation of the retracting device and the retracting rod 5, thereby ensuring multiple reuse of the barrier material and convenient operation. By arranging a counterweight rod at the bottom of the barrier material, the barrier device can be placed more conveniently due to the pull of the gravity of the counterweight rod 3 during the placement of the barrier material.
[0045] Optionally, the blocking device is a rolling curtain 2, and the retracting device is a first retracting motor that acts on the retracting rod 5 to retract and place the rolling curtain 2.
[0046] Among them, the utility model sets the blocking material as a whole piece of rolling curtain 2. When it needs to be collected, since one end of the rolling curtain 2 is connected to the retracting rod 5, the retracting rod 5 is rotated by the first retracting motor, and the retracting rod 5 drives the rolling curtain 2 around the retracting rod 5 under the rotating condition to collect the rolling curtain 2. After the collection is completed, the first retracting motor stops running. At this time, the blocking part is in a fully open and unobstructed state, which is suitable for the operation of the axial flow fan or the use of the blocking part as a natural vent. When the blocking part needs to be sealed, the retracting rod 5 is rotated in the opposite direction to the collection of the rolling curtain 2. At this time, the rolling curtain 2 naturally falls downward under the drive of the counterweight rod, and the first retracting motor stops running when the counterweight rod 3 reaches the sealing position. At this time, the stretched rolling curtain 2 completely blocks the blocking part, realizing the sealing of the blocking part.
[0047] Optionally, the rolling curtain 2 includes a hinge plate and two soft rolling curtains made of soft material.
[0048] Among them, the utility model uses a hinge plate or a soft plate as the rolling curtain 2, firstly, to facilitate the convolution and surround the retraction rod 5 when collecting, and secondly, the rolling curtain 2 can form a vertical plane under the drive of the counterweight rod 3 when placed, thereby avoiding the deformation of the rolling curtain 2 caused by long-term bending and surround the retraction rod 5.
[0049] Optionally, the rolling curtain 2 is made of a transparent heat-insulating material.
[0050] Among them, the utility model can achieve the effect of heat preservation and light transmission by setting the roller blind 2 as a transparent heat-insulating material, so that it can achieve a better sealing effect.
[0051] Embodiment 2:
[0052] like Figure 3 As shown, an embodiment of the utility model provides a structural schematic diagram of a sealing device of an axial flow fan, comprising: a sealing shell 6, a contraction sealing device and a boundary sealing device; the sealing shell 6 is arranged at the end of the exhaust port of the axial flow fan in contact with the external environment, the interior of the sealing shell 6 includes a blocking part and a sealing part, the blocking part is a hollow structure connecting the exhaust port with the external environment, the contraction sealing device is contractedly arranged in the blocking part, the sealing part is arranged on the side of the blocking part, and the boundary sealing device includes a plurality of sealing devices, and the plurality of sealing devices are evenly arranged on the sealing part.
[0053] Among them, the utility model arranges the shrinking sealing device on the blocking part. When the axial flow fan is working, the shrinking sealing device is retracted to make the blocking part unobstructed, and the air volume generated by the axial flow fan can flow through the blocking part, ensuring that the air volume is unobstructed. When the exhaust port needs to be sealed, the shrinking sealing device is placed to cover the blocking part, and a boundary sealing device is arranged around the blocking part to achieve a better sealing effect. Prevent the external environment from damaging the axial flow fan.
[0054] Optionally, the shrinkage sealing device includes: a shrinkage rod 5, a shrinkage device, a blocking device, and a counterweight rod 3, the shrinkage rod 5 is fixed to the top of the blocking part, one end of the blocking device is connected to the shrinkage rod 5, and the other end of the blocking device is connected to the counterweight rod 3, the shrinkage device is connected to the shrinkage rod 5, and acts on the shrinkage rod 5 to collect and place the blocking device.
[0055] Among them, the utility model arranges a retractable barrier material to make the barrier part in a fully open and unobstructed state or a sealed state. The barrier material is collected and prevented by the cooperation of the retracting device and the retracting rod 5, thereby ensuring multiple reuse of the barrier material and convenient operation. By arranging a counterweight rod at the bottom of the barrier material, the barrier device can be placed more conveniently due to the pull of the gravity of the counterweight rod 3 during the placement of the barrier material.
[0056] Optionally, the blocking device is a folding sheet, which includes a retraction rope and multiple independent folding sheets 7. The retraction rope runs through all the folding sheets 7, and both ends are respectively connected to the retraction device and the counterweight rod. The retraction device is a second retraction motor for collecting and placing the retraction rope.
[0057] Among them, the utility model sets the blocking material as a folding sheet. When it is necessary to collect, since all the folding sheets 7 are penetrated by a retracting rope, one end of the retracting rope is connected to the counterweight rod 3, and the retracting rope is rotated by the second retracting motor. The retracting rope drives the counterweight rod 3 to move upward under the rotating condition, so that the folding sheets 7 are stacked until the folding sheets 7 are stacked to the position of the retracting rod 5, and the collection of the folding sheets 7 is completed. After the collection is completed, the second retracting motor stops running. At this time, the blocking part is in a fully open and unobstructed state, which is suitable for the operation of the axial flow fan or the blocking part is used as a natural vent. When the blocking part needs to be sealed, the second retracting motor is operated in the opposite direction of the collection and folding unit. At this time, the retracting rope is in a relaxed state and naturally extends downward under the drive of the counterweight rod 3. The stacked folding sheets 7 also begin to extend due to the drive of the counterweight rod 3. After the extension is completed, the blocking part is completely covered, and the sealing of the blocking part is achieved.
[0058] Optionally, the material of the folded single sheet 7 is a transparent heat-insulating material.
[0059] Among them, the utility model can achieve the effect of heat preservation and light transmission by setting the folded single sheet 7 as a transparent heat-insulating material, so that it can achieve a better sealing effect.
[0060] Embodiment 3:
[0061] like Figure 4 As shown, an embodiment of the utility model provides a structural schematic diagram of a sealing device of an axial flow fan, comprising: a sealing shell 6, a contraction sealing device and a boundary sealing device; the sealing shell 6 is arranged at the end of the exhaust port of the axial flow fan in contact with the external environment, the interior of the sealing shell 6 includes a blocking part and a sealing part, the blocking part is a hollow structure connecting the exhaust port with the external environment, the contraction sealing device is contractedly arranged in the blocking part, the sealing part is arranged on the side of the blocking part, and the boundary sealing device includes a plurality of sealing devices, and the plurality of sealing devices are evenly arranged on the sealing part.
[0062] Among them, the utility model arranges the shrinking sealing device on the blocking part. When the axial flow fan is working, the shrinking sealing device is retracted to make the blocking part unobstructed, and the air volume generated by the axial flow fan can flow through the blocking part, ensuring that the air volume is unobstructed. When the exhaust port needs to be sealed, the shrinking sealing device is placed to cover the blocking part, and a boundary sealing device is arranged around the blocking part to achieve a better sealing effect. Prevent the external environment from damaging the axial flow fan.
[0063] Optionally, the shrinkage sealing device includes: a shrinkage rod 5, a shrinkage device, a blocking device, and a counterweight rod 3, the shrinkage rod 5 is fixed to the top of the blocking part, one end of the blocking device is connected to the shrinkage rod 5, and the other end of the blocking device is connected to the counterweight rod 3, the shrinkage device is connected to the shrinkage rod 5, and acts on the shrinkage rod 5 to collect and place the blocking device.
[0064] Among them, the utility model arranges a retractable barrier material to make the barrier part in a fully open and unobstructed state or a sealed state. The barrier material is collected and prevented by the cooperation of the retracting device and the retracting rod 5, thereby ensuring multiple reuse of the barrier material and convenient operation. By arranging a counterweight rod at the bottom of the barrier material, the barrier device can be placed more conveniently due to the pull of the gravity of the counterweight rod 3 during the placement of the barrier material.
[0065] Optionally, the sealing device includes a sealing groove 8 and a sealing strip, and the sealing strip is arranged in the sealing groove 8.
[0066] The utility model provides a sealing device around the edge of the blocking part, thereby ensuring a better sealing effect when the blocking part is sealed, and better preventing the external environment from damaging the axial flow fan.
[0067] Optionally, the number of the sealing devices is two, and the two sealing devices are respectively arranged on both sides of the blocking device that are not connected to the retractable rod 5 or the counterweight rod 3.
[0068] Among them, in the utility model, since the two ends of the blocking device are already provided with a retractable rod 5 and a counterweight rod 3, and since the retractable rod 5 is fixed to the top of the blocking part, the counterweight rod 3 will naturally fit downward to the bottom of the blocking part due to the weight factor, and therefore, there is no need to set a sealing device on the edge of the counterweight rod 3 where the retractable rod 5 is set, thereby providing a sealing device on both sides of the blocking device, saving materials for setting the sealing device.
[0069] Optionally, the blocking portion is further provided with a plurality of wind shielding rods 4, and the plurality of wind shielding rods 4 are vertically and evenly arranged on one side of the blocking device.
[0070] The utility model provides a windshield rod 4 on one side of the blocking device to prevent the blocking material from shifting due to the influence of the external environment. Therefore, the windshield rod 4 is provided to fix the blocking material on the blocking part to better seal the blocking part.
[0071] The above description is only a preferred embodiment of the utility model and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the utility model is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the utility model (but not limited to) by each other to form a technical solution.
Claims
1. A sealing device for an axial flow fan, characterized in that: include: Sealing enclosures, shrink seals, and boundary seals; The sealing shell is arranged at the end of the exhaust port of the axial flow fan in contact with the external environment. The interior of the sealing shell includes a blocking part and a sealing part. The blocking part is a hollow structure connecting the exhaust port and the external environment. The shrinkage sealing device is shrinkage-arranged in the blocking part, and the sealing part is arranged on the side of the blocking part. The boundary sealing device includes a plurality of sealing devices, and the plurality of sealing devices are evenly arranged in the sealing part.
2. The sealing device of an axial flow fan according to claim 1, characterized in that: The shrinking sealing device includes: a shrinking rod, a shrinking device, a blocking device, and a counterweight rod. The shrinking rod is fixed to the top of the blocking part, one end of the blocking device is connected to the shrinking rod, and the other end of the blocking device is connected to the counterweight rod. The shrinking device is connected to the shrinking rod, and the shrinking rod acts on the blocking device to collect and place it.
3. The sealing device of an axial flow fan according to claim 2, characterized in that: The blocking device is a rolling curtain, and the retracting device is a first retracting motor that acts on the retracting rod to collect and place the rolling curtain.
4. The sealing device of an axial flow fan according to claim 3, characterized in that: The rolling shutter comprises a hinge plate and a soft rolling shutter sheet made of soft material.
5. The sealing device of an axial flow fan according to claim 3, characterized in that: The material of the rolling curtain is a transparent heat-insulating material.
6. The sealing device of an axial flow fan according to claim 2, characterized in that: The blocking device is a folding sheet, which includes a retraction rope and multiple independent folding sheets. The retraction rope runs through all the folding sheets, and both ends are respectively connected to the retraction device and the counterweight rod. The retraction device is a second retraction motor for collecting and placing the retraction rope.
7. The sealing device of an axial flow fan according to claim 6, characterized in that: The material of the folded single sheet is a transparent heat-insulating material.
8. The sealing device of an axial flow fan according to claim 2, characterized in that: The sealing device comprises a sealing groove and a sealing strip, wherein the sealing strip is arranged in the sealing groove.
9. The sealing device of an axial flow fan according to claim 8, characterized in that: The number of the sealing devices is two, and the two sealing devices are respectively arranged on both sides of the blocking device that are not connected to the retractable rod or the counterweight rod.
10. The sealing device of an axial flow fan according to claim 2, characterized in that: The blocking portion is further provided with a plurality of wind shielding rods, and the plurality of wind shielding rods are vertically and evenly arranged on one side of the blocking device.