Air door driving structure for anti-explosion cooling fan

Abstract

The air door driving structure comprises a shell, a stator is arranged in the shell, a rotor is rotationally connected to the stator, an air door is arranged at the end of the shell in a sliding mode, a connecting sleeve is arranged on the rotor, a lead screw is rotationally connected into the connecting sleeve, and the end of the lead screw penetrates through the connecting sleeve and is arranged on the air door. A driving cavity is defined between the inner side wall of the connecting sleeve and the outer surface of the rotor, a transmission part is arranged in the driving cavity, and the rotor drives the lead screw to be close to or away from the air door in the axis direction of the shell through the transmission part. The explosion-proof fan has the effect of improving the applicability of the explosion-proof fan.

Description

Technical Field

[0001] This application relates to the field of explosion-proof fan technology, and in particular to a damper drive structure for an explosion-proof heat dissipation fan. Background Technology

[0002] In hazardous environments such as petroleum, chemical, and coal mines where flammable and explosive gases or dust exist, explosion-proof fans are crucial equipment for ensuring safe production. Their main function is to promptly exhaust hazardous gases and heat, preventing explosions and other dangerous accidents. Air dampers are an important component of explosion-proof fans. When the fan is running, the dampers are open to ensure smooth gas exchange. When the fan is not running, the dampers are closed to prevent flammable and explosive gases or dust from flowing back into the fan, avoiding contact between residual electrical sparks or high-temperature components inside the fan and hazardous media that could trigger an explosion. They also prevent external debris from entering the fan, reducing damage to the internal structure and ensuring the safety and reliability of the fan upon restart.

[0003] Currently, in existing explosion-proof fans, the drive of the fan and damper usually adopts an independent control architecture. The rotational power of the fan is provided by the cooperation of the stator and rotor, while the opening and closing of the damper is achieved by an electric push rod through a mechanical linkage mechanism.

[0004] However, the design of an independent control architecture requires additional circuit boards to achieve control. The additional circuit boards increase the operating cost of the explosion-proof fan control system. At the same time, the combination of multiple independent components results in low integration of the explosion-proof fan, which occupies a large space and is not conducive to installation and use in explosion-proof places with limited space. This reduces the applicability of the explosion-proof fan and has obvious shortcomings. Utility Model Content

[0005] To improve the applicability of explosion-proof fans, this application provides a damper drive structure for explosion-proof heat dissipation fans.

[0006] The damper drive structure for an explosion-proof cooling fan provided in this application adopts the following technical solution:

[0007] A damper drive structure for an explosion-proof cooling fan includes a housing, which is cylindrical in shape. A stator is disposed inside the housing, and a rotor for driving cooling blades to rotate is rotatably connected to the stator. A damper is slidably disposed at the end of the housing. A connecting sleeve is disposed on the rotor, and cooling blades are disposed on the outer surface of the connecting sleeve. A lead screw is rotatably connected inside the rotor, and the end of the lead screw passes through the connecting sleeve and is disposed on the surface of the damper. A driving cavity is formed between the inner sidewall of the connecting sleeve and the outer surface of the rotor. A transmission component is disposed in the driving cavity, and the rotor drives the lead screw to move closer to or away from the damper along the axial direction of the housing via the transmission component.

[0008] By adopting the above technical solution, during the operation of the fan, the rotor drives the lead screw to move towards or away from the damper through the transmission component. When the lead screw approaches the damper, it pushes the damper away from the housing, thus opening the damper; when the lead screw moves away from the damper, it drives the damper towards the housing, thus closing the damper. In this way, the opening and closing of the damper is directly driven by the rotational power of the rotor, realizing the linkage control of the rotation of the heat dissipation blades and the opening and closing of the damper. There is no need to configure an additional electric push rod and a corresponding control circuit board, which effectively reduces the operating cost of the explosion-proof fan control system, while improving the system integration of the explosion-proof fan and enhancing its applicability.

[0009] Optionally, the transmission component is a nut block, which is threaded onto the lead screw. A clamping assembly is provided inside the drive cavity, which clamps the nut block onto the outer surface of the rotor.

[0010] By adopting the above technical solution, when the rotor rotates, the clamping assembly presses the nut block against the outer surface of the rotor. When the rotor rotates, the friction force drives the nut block to rotate. The rotation of the nut block drives the lead screw to move towards the damper. The lead screw pushes the damper away from the housing, thereby opening the damper. The clamping assembly ensures that the nut block and the rotor always maintain good contact and synchronous rotation, reducing the possibility of transmission failure due to loosening or slippage, thereby improving the stability of the lead screw movement.

[0011] Optionally, the clamping assembly includes two centrifugal blades, which are disposed opposite each other on both sides of the driving cavity. Each centrifugal blade is provided with a clamping surface, which is inclined from bottom to top along the direction close to the axis of the housing. The nut block is provided with a pressure ring surface, and the clamping surface abuts against the pressure ring surface. A tension spring is provided in the driving cavity, with its two ends respectively disposed on the two centrifugal blades. The elastic force of the tension spring drives the two centrifugal blades to move toward the direction close to the axis of the housing.

[0012] By adopting the above technical solution, when the fan starts at a low rotor speed, the elastic force of the tension spring is greater than the centrifugal force on the centrifugal plate. Through the cooperation of the inclined pressing surface and the pressure ring surface, the centrifugal plate generates a downward pressing force on the nut block, thereby ensuring the stable fit between the nut block and the rotor.

[0013] When the damper is opened to its maximum extent, the rotor speed is increased so that the centrifugal force is greater than the elastic force of the tension spring. The centrifugal force drives the two centrifugal blades to move away from the axis of the housing. At this time, the pressing surface is separated from the pressing ring surface, the pressing force of the centrifugal blades on the nut block disappears, the nut block and the rotor separate, and the rotor only drives the heat dissipation blades to rotate, while the damper remains in the maximum open state.

[0014] When the rotor stops, the centrifugal force on the centrifugal blades disappears, and the tension spring pulls the two centrifugal blades closer to each other. At this time, the clamping surface of the centrifugal blades presses the nut block against the rotor again, controlling the rotor to reverse. The rotor drives the nut block to reverse, and the nut block drives the screw to move away from the damper. The screw drives the damper closer to the housing and finally closes it. With the clamping assembly, the connection state between the nut block and the rotor can be automatically adjusted based on the rotor speed. Moreover, it is controlled by a purely mechanical structure, without the need for a complex electronic control system, thus reducing the risk of failure.

[0015] Optionally, two tension springs are provided, with the two tension springs respectively located on both sides of the centrifugal plate.

[0016] By adopting the above technical solution, compared with a single tension spring, the setting of two tension springs can provide a more balanced and stable tension, effectively reducing the possibility of the centrifugal blade tilting or shifting due to uneven force on one side. Thus, when the clamping assembly is in action, the clamping surface and the pressure ring surface are tightly fitted, ensuring the transmission stability of the nut block and the rotor.

[0017] Optionally, the connecting sleeve has a guide groove on its inner sidewall facing the driving cavity. The guide groove is perpendicular to the axial direction of the housing, and both centrifugal blades are slidably connected inside the guide groove.

[0018] By adopting the above technical solution, the guide groove provides a precise guiding path for the movement of the two centrifugal vanes, thereby reducing the possibility of misalignment during the movement of the two centrifugal vanes. This ensures that when the rotor speed decreases, the pressing surface on the two centrifugal vanes can re-fit tightly with the pressure ring surface, thereby further improving the transmission stability between the nut block and the rotor.

[0019] Optionally, the rotor is provided with a receiving part, which is conical, and the end of the nut block away from the pressure ring surface is provided with a contact ring surface, which is inclined from top to bottom along the direction close to the axis of the housing.

[0020] By adopting the above technical solution, when the clamping assembly clamps the nut block, the receiving part and the contact ring surface increase the friction between the nut block and the rotor, thereby ensuring a stable transmission connection between the rotor and the nut block; when the clamping assembly does not clamp the nut block, the tapered receiving part and the inclined contact ring surface form a guiding structure, guiding the nut block to maintain radial positioning on the rotor surface, ensuring that the nut block separates smoothly along the rotor radially.

[0021] Optionally, the connecting sleeve is detachably connected to the rotor via multiple connecting bolts.

[0022] By adopting the above technical solution, when problems occur with the clamping component or the internal lead screw and nut block, workers can disassemble the connecting sleeve by removing the connecting bolts, thereby inspecting, repairing or replacing the components in the drive cavity, reducing maintenance difficulty and maintenance costs.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. In this embodiment of the application, by setting a lead screw and a transmission component, when the fan is running, the rotor drives the lead screw to move towards or away from the damper through the transmission component, thereby realizing the opening and closing of the damper. In this way, the opening and closing of the damper is directly driven by the rotational power of the rotor, realizing the linkage control of the rotation of the heat dissipation blades and the opening and closing of the damper. There is no need to configure an additional electric push rod and a corresponding control circuit board, which effectively reduces the operating cost of the explosion-proof fan control system, while improving the system integration of the explosion-proof fan and improving the applicability of the explosion-proof fan;

[0025] 2. In this embodiment of the application, by setting a clamping component, the clamping component ensures that the nut block and the rotor always maintain good contact and synchronous rotation, reducing the possibility of transmission failure due to loosening or slippage, thereby improving the stability of the screw movement;

[0026] 3. This application connects two centrifugal vanes with a tension spring. With the tension spring in place, the connection state between the nut block and the rotor can be automatically adjusted based on the rotor speed. When the damper is fully open, the nut block automatically separates from the rotor to avoid over-driving. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this application.

[0028] Figure 2 This is a cross-sectional view of the lead screw in an embodiment of this application.

[0029] Figure 3 This is a cross-sectional view of the connecting sleeve in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the clamping component in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 01, housing; 02, stator; 03, rotor; 031, receiving part; 04, bearing; 1, damper; 2, connecting bolt; 3, connecting sleeve; 31, guide groove; 4, lead screw; 5, drive cavity; 6, transmission component; 61, nut block; 611, contact ring surface; 612, pressure ring surface; 7, clamping assembly; 71, centrifugal vane; 711, clamping surface; 72, tension spring. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4This application will be described in further detail.

[0033] This application discloses a damper drive structure for an explosion-proof cooling fan.

[0034] Reference Figure 1 and Figure 2 A damper drive structure for an explosion-proof cooling fan includes a housing 01, which is cylindrical. A stator 02 is fixedly installed inside the housing 01. A rotor 03 for driving the cooling blades to rotate is rotatably connected to the stator 02. A bearing 04 is installed between the stator 02 and the rotor 03. A damper 1 is slidably provided at the end of the housing 01 and moves along the axial direction of the housing 01.

[0035] Reference Figure 1 and Figure 2 A connecting sleeve 3 is detachably connected to the rotor 03 by multiple connecting bolts 2. Heat dissipation fins are installed on the outer peripheral surface of the connecting sleeve 3. In this embodiment, there are six connecting bolts 2, which are evenly arranged on the surface of the connecting sleeve 3 in the circumferential direction. A lead screw 4 is rotatably connected inside the rotor 03. The end of the lead screw 4 passes through the connecting sleeve 3 and is fixedly connected to the surface of the damper 1 near the connecting sleeve 3. The inner sidewall of the connecting sleeve 3 and the outer surface of the rotor 03 enclose a driving cavity 5. A transmission component 6 is provided inside the driving cavity 5. The rotor 03 drives the lead screw 4 to move closer to or away from the damper 1 along the axial direction of the housing 01 through the transmission component 6.

[0036] Reference Figure 2 and Figure 3 The transmission component 6 is a nut block 61, which is threaded onto the lead screw 4. The rotor 03 is provided with a receiving part 031, which is conical. The end of the nut block 61 near the receiving part 031 is provided with a contact ring surface 611, which is inclined from top to bottom along the direction close to the axis of the housing 01. The drive cavity 5 is provided with a pressing component 7, which presses the contact ring surface 611 of the nut block 61 onto the receiving part 031 of the rotor 03.

[0037] When the rotor 03 rotates, the clamping assembly 7 presses the nut block 61 onto the rotor 03. When the rotor 03 rotates, the friction between the contact ring surface 611 and the receiving part 031 drives the nut block 61 to rotate. The rotation of the nut block 61 drives the lead screw 4 to move towards the damper 1. When the lead screw 4 approaches the damper 1, it pushes the damper 1 away from the housing 01, thus opening the damper 1. When the lead screw 4 moves away from the damper 1, it drives the damper 1 towards the housing 01, thus closing the damper 1. In this way, the opening and closing of the damper 1 is directly driven by the rotational power of the rotor 03, realizing the linkage control of the rotation of the heat dissipation blades and the opening and closing of the damper 1. There is no need to configure an electric push rod and a corresponding control circuit board, which effectively reduces the operating cost of the explosion-proof fan control system, while improving the system integration of the explosion-proof fan and the applicability of the explosion-proof fan.

[0038] Reference Figure 2 and Figure 3 The connecting sleeve 3 has a guide groove 31 on the inner wall facing the drive cavity 5. The guide groove 31 is perpendicular to the axis of the housing 01. The pressing assembly 7 includes two centrifugal blades 71 that are slidably connected inside the guide groove 31. The two centrifugal blades 71 are arranged radially opposite to each other on the outer periphery of the lead screw 4.

[0039] Reference Figure 2 and Figure 3 Each centrifugal disc 71 is provided with a pressing surface 711. The pressing surface 711 is inclined from bottom to top along the direction close to the axis of the housing 01. The end face of the nut block 61 away from the contact ring surface 611 is provided with a pressure ring surface 612. The pressing surface 711 abuts against the pressure ring surface 612.

[0040] Reference Figure 2 and Figure 4 Two tension springs 72 are provided in the drive cavity 5. The two tension springs 72 are respectively located at opposite ends of the centrifugal disc 71. The two ends of each tension spring 72 are fixedly connected to the two centrifugal discs 71. The elastic force of the tension springs 72 drives the two centrifugal discs 71 to move along the guide groove 31 toward the direction close to the axis of the housing 01.

[0041] When the fan starts and the rotor 03 rotates at a low speed, the elastic force of the tension spring 72 is greater than the centrifugal force on the centrifugal blades 71. Through the cooperation of the inclined pressing surface 711 and the pressure ring surface 612, the centrifugal blades 71 exert a downward pressing force on the nut block 61. At this time, the centrifugal blades 71 press the nut block 61 tightly onto the receiving part 031, thus ensuring that the nut block 61 rotates with the rotor 03. When the damper 1 is opened to its maximum extent, the operating speed of the rotor 03 is increased. The centrifugal force on the centrifugal blades 71 gradually increases and eventually exceeds the elastic force of the tension spring 72. The centrifugal force drives the two centrifugal blades 71 to move along the guide groove 31 in a direction away from the axis of the housing 01. At this time, the pressing surface 71... 1. When the centrifugal blades 71 are separated from the pressure ring surface 612, the clamping force of the centrifugal blades 71 on the nut block 61 disappears, and the nut block 61 separates from the rotor 03. At this time, the rotor 03 only drives the heat dissipation blades to rotate, and the damper 1 remains in the maximum open state. When the rotor 03 stops rotating, the centrifugal force on the centrifugal blades 71 disappears, the tension spring 72 restores its elastic deformation and pulls the two centrifugal blades 71 closer to each other. At this time, the clamping surface 711 of the centrifugal blades 71 presses the nut block 61 against the receiving part 031 of the rotor 03 again. Then, the rotor 03 is controlled to reverse, and the rotor 03 drives the nut block 61 to reverse. The nut block 61 drives the screw 4 to move away from the damper 1. The screw 4 drives the damper 1 to approach the housing 01 and finally closes it.

[0042] The implementation principle of the damper drive structure for an explosion-proof cooling fan according to an embodiment of this application is as follows: When the rotor 03 rotates, the clamping assembly 7 presses the nut block 61 onto the rotor 03. When the rotor 03 rotates, the friction between the contact ring surface 611 and the receiving part 031 drives the nut block 61 to rotate. The rotation of the nut block 61 drives the lead screw 4 to move towards the damper 1. When the lead screw 4 approaches the damper 1, the lead screw 4 pushes the damper 1 away from the housing 01, realizing the opening of the damper 1. When the lead screw 4 moves away from the damper 1, the lead screw 4 drives the damper 1 towards the housing 01, realizing the closing of the damper 1. In this way, the opening and closing of the damper 1 is directly driven by the rotational power of the rotor 03, realizing the linkage control of the rotation of the cooling blades and the opening and closing of the damper 1. There is no need to configure an electric push rod and a corresponding control circuit board, which effectively reduces the operating cost of the explosion-proof fan control system, while improving the system integration of the explosion-proof fan and improving the applicability of the explosion-proof fan.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A damper drive structure for an explosion-proof cooling fan, comprising a housing (01), the housing (01) being cylindrical, a stator (02) being disposed inside the housing (01), a rotor (03) for driving the cooling blades to rotate being rotatably connected to the stator (02), and a damper (1) being slidably disposed at the end of the housing (01), characterized in that, A connecting sleeve (3) is provided on the rotor (03), and heat dissipation blades are provided on the outer surface of the connecting sleeve (3). A lead screw (4) is rotatably connected inside the rotor (03). The end of the lead screw (4) passes through the connecting sleeve (3) and is provided on the surface of the damper (1). The inner sidewall of the connecting sleeve (3) and the outer surface of the rotor (03) enclose a driving cavity (5). A transmission component (6) is provided in the driving cavity (5). The rotor (03) drives the lead screw (4) to move closer to or away from the damper (1) along the axial direction of the housing (01) through the transmission component (6).

2. The damper drive structure for an explosion-proof cooling fan according to claim 1, characterized in that, The transmission component (6) is a nut block (61), which is threaded onto the lead screw (4). A clamping assembly (7) is provided in the drive cavity (5), which clamps the nut block (61) onto the outer surface of the rotor (03).

3. The damper drive structure for an explosion-proof cooling fan according to claim 2, characterized in that, The clamping assembly (7) includes two centrifugal blades (71), which are arranged opposite each other on both sides of the drive cavity (5). Each centrifugal blade (71) is provided with a clamping surface (711), which is inclined from bottom to top along the direction close to the axis of the housing (01). The nut block (61) is provided with a pressure ring surface (612), and the clamping surface (711) abuts against the pressure ring surface (612). A tension spring (72) is provided in the drive cavity (5), and the two ends of the tension spring (72) are respectively provided on the two centrifugal blades (71). The elastic force of the tension spring (72) drives the two centrifugal blades (71) to move in the direction close to the axis of the housing (01).

4. The damper drive structure for an explosion-proof cooling fan according to claim 3, characterized in that, Two tension springs (72) are provided, and the two tension springs (72) are respectively provided on both sides of the centrifugal plate (71).

5. The damper drive structure for an explosion-proof cooling fan according to claim 3, characterized in that, The connecting sleeve (3) has a guide groove (31) on the inner wall facing the driving cavity (5). The guide groove (31) is perpendicular to the axial direction of the housing (01). Both centrifugal blades (71) are slidably connected inside the guide groove (31).

6. The damper drive structure for an explosion-proof cooling fan according to claim 3, characterized in that, The rotor (03) is provided with a receiving part (031), which is conical. The end of the nut block (61) away from the pressure ring surface (612) is provided with a contact ring surface (611), which is inclined from top to bottom along the direction close to the axis of the housing (01).

7. The damper drive structure for an explosion-proof cooling fan according to claim 1, characterized in that, The connecting sleeve (3) is detachably connected to the rotor (03) by a plurality of connecting bolts (2).

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