Air door driving structure of ventilating fan for square cabin

Abstract

The utility model relates to the technical field of ventilating fans, in particular to an air door driving structure of a ventilating fan for a square cabin, which comprises a fan support, a shutter assembly mounted on the fan support, a connecting rod assembly connected to the shutter assembly in a linkage manner, and a lead screw transmission assembly connected to the connecting rod assembly in a linkage manner, the lead screw transmission assembly comprises a seat body, a motor and a lead screw, the motor and the lead screw are installed on the seat body, an output shaft of the motor is connected with one end of the lead screw, and a lead screw nut is screwed on the lead screw. The fan support is provided with a boss, the seat body is installed on the surface of the boss, the connecting rod assembly comprises a short rocker arm, and the lead screw nut is hinged to one end of the short rocker arm. The motor drives the lead screw to rotate, then the lead screw nut is driven to move along the axis of the lead screw, and then the connecting rod assembly is driven to drive the shutter to be opened or closed. Due to the fact that the transmission accuracy of the lead screw is high, the measurement accuracy of the device can be guaranteed, the opening size of the louver can be accurately controlled, the lead screw transmission structure is simple, and therefore fault points are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation fans, in particular to a damper driving structure of a ventilation fan for a square cabin. Background Art

[0002] The shelter has high mobility. According to different needs, the corresponding structural design is carried out inside it, and relevant equipment is installed to have specific functions. It is widely used in mobile command systems, communications, medical care, logistics support, etc. The ventilation fan on the shelter plays the role of ventilation. The ventilation fan is often equipped with a shutter structure, which can be opened and closed automatically to achieve dust and water-proof effects. The ventilation fan is the best choice for cooling and ventilation in modern shelters. The ventilation fan with environmental protection and energy-saving characteristics will become ventilation and cooling equipment and the mainstream of the market.

[0003] Screw drive is a commonly used transmission structure in the mechanical field. Screw drive has the following advantages: the transmission accuracy of the screw is relatively high, which can ensure the measurement accuracy of the device; the structure of the screw drive system is relatively simple, which reduces the failure points and can improve its reliability; the structure of the screw is relatively simple, which can greatly reduce the manufacturing cost.

[0004] In the prior art, the opening and closing control of the shutters on the ventilation fan is mainly through gear transmission. For example, the patent with the announcement number CN217269860U discloses an outdoor cabin roof-mounted ventilation fan with shielding function, which drives the first right connecting plate to adjust up and down through the rotation of the plug rod, drives the connecting piece to adjust up and down through the first right connecting plate, and drives the window leaf to change the angle through the connecting piece. Another example is the patent with the announcement number CN212899067U, which is a manual and automatic ventilation fan structure for a cabin. The motor drives the active gear rod to rotate forward and drives the driven gear rod to rotate counterclockwise and drive the swing rod. The swing rod drives the connecting rod to push the blade synchronization rod to move linearly. The blade synchronization rod drives the blade connecting piece and causes the blade to rotate.

[0005] In the above-mentioned prior art, the shutters are opened by using a bevel gear transmission structure, and no screw transmission is used. Utility Model Content

[0006] The main purpose of the utility model is to propose a damper driving structure of a ventilation fan for a cabin, which uses a lead screw drive to control the opening and closing of the shutter, aiming to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the utility model proposes a damper driving structure of a ventilation fan for a square cabin, comprising a fan bracket and a shutter assembly installed on the fan bracket, a connecting rod assembly being linked to the shutter assembly, and also comprising a screw transmission assembly, the screw transmission assembly comprising a seat body, and a motor and a screw installed on the seat body, the output shaft of the motor is connected to one end of the screw, and a screw nut is screwed on the screw; the fan bracket has a boss, the seat body is installed on the surface of the boss, the connecting rod assembly comprises a short rocker arm, and the screw nut is hinged to one end of the short rocker arm.

[0008] Preferably, the back side of the boss is provided with a groove; the boss is arranged with a plurality of vents; waist-shaped grooves are respectively provided on both sides of each vent; the connecting rod assembly includes a long rocker arm and the short rocker arm; one end of the short rocker arm is hinged to one end of the long rocker arm; the shutter assembly includes a plurality of arranged flaps, and a support rod is provided on the front side of each flap; the flap is installed in the groove at a position corresponding to the vent, and the upper parts of the two ends of the flap are connected to the two side walls of the groove through a rotating shaft; the support rod is hinged to the long rocker arm after passing through the waist-shaped groove of the boss.

[0009] Preferably, there are two screw drive assemblies, which are respectively installed on the boss surface near the two sides; there are two connecting rod assemblies, and one connecting rod assembly is corresponding to each screw drive assembly; there are two support rods on each flap, and the two support rods respectively pass through the waist-shaped grooves on both sides of the vent and are respectively hinged to the corresponding long rocker arms.

[0010] Preferably, a first sealing ring is provided in the sink corresponding to each vent position, and the first sealing ring is bonded to the bottom wall of the sink; when the flap is closed, the surface of the flap is attached to the end face of the first sealing ring.

[0011] Preferably, a second sealing ring is provided in the sink corresponding to each waist-shaped groove position, and the second sealing ring is fixedly mounted on the bottom wall of the sink by screws. When the flap is closed, the surface of the flap is in contact with the end face of the second sealing ring.

[0012] Preferably, a wire baffle is provided above the topmost vent, and the wire baffle is composed of a first plate body and a second plate body and has an L-shaped cross-section. The first plate body of the wire baffle is fixed on the surface of the boss by bolts, and the second plate body of the wire baffle is perpendicular to the surface of the boss.

[0013] Preferably, a guide plate is provided at the position of the lowest vent; the guide plate has a guide groove inside, which is connected to the lowest vent; a mounting edge is extended at the lower part of the guide plate; and the mounting edge is fixed to the surface of the boss by bolts.

[0014] Preferably, a cover is provided on the surface of the boss, and the cover covers the lead screw transmission assembly and the connecting rod assembly in their inner cavity.

[0015] Preferably, the seat body has a U-shaped groove with an open top, and a partition is arranged in the middle of the U-shaped groove; the partition divides the U-shaped groove of the seat body into a first compartment and a second compartment; the motor is arranged in the second compartment; the lead screw and the lead screw nut are arranged in the first compartment; a U-shaped opening with an open top is arranged in the top center of the partition; the output shaft of the motor passes through the U-shaped opening and is connected to the lead screw; a screw through hole is arranged in the partition for passing the screw to fix the motor.

[0016] Preferably, a support block is provided on the bottom plate of the first compartment at one end away from the partition, and a bearing mounting hole is provided on the support block. The bearing mounting hole is a countersunk hole, and the open end of the bearing mounting hole faces the partition. A bearing is provided in the bearing mounting hole, and the end of the screw away from the motor is inserted into the inner ring of the bearing.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the utility model are as follows:

[0018] (1) In the present invention, the motor drives the lead screw to rotate, and then drives the lead screw nut to move along the axis of the lead screw, and then drives the connecting rod assembly to drive the blinds to open or close. Since the transmission accuracy of the lead screw is relatively high, the measurement accuracy of the device can be ensured, and the size of the blinds can be accurately controlled. In addition, the structure of the lead screw drive is relatively simple, thereby reducing the failure points and improving its reliability; the structure of the lead screw is relatively simple, which can greatly reduce the manufacturing cost.

[0019] (2) In the present invention, two sets of screw drive assemblies are used to drive the shutters to open or close. When one set of the screw drive assemblies fails, the other set can still continue to work, thereby ensuring the stability of the entire damper drive structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is an exploded schematic diagram of the damper drive structure provided by the utility model;

[0022] Figure 2 This is a schematic diagram of the damper drive structure provided by the utility model without the cover;

[0023] Figure 3 A three-dimensional structural diagram of the damper driving structure provided by the utility model;

[0024] Figure 4 The three-dimensional structure of the fan bracket in the utility model Figure 1 ;

[0025] Figure 5 The three-dimensional structure of the fan bracket in the utility model Figure 2 ;

[0026] Figure 6 It is a three-dimensional structural diagram of the seat body in the utility model;

[0027] Figure 7 This is the front view of the seat body in the utility model;

[0028] Figure 8 It is a top view of the seat body in the utility model;

[0029] Fig. 9 for Figure 7 Cross-sectional view at AA in the middle.

[0030] Description of the accompanying drawings: 1. seat; 2. partition; 2a. U-shaped opening; 2b. screw hole; 3. first compartment; 3a. T-slot; 3b. first through hole; 3c. second through hole; 4. second compartment; 4a. second bolt hole; 5. lead screw; 6. lead screw nut; 7. motor; 8. support block; 8a. bearing mounting hole; 8b. oil filling hole; 9. connecting plate; 9a. first bolt hole; 10. fan bracket; 1 0a, boss; 10b, sink; 10c, vent; 10d, waist-shaped groove; 11, hexagonal nut column; 12, shutter assembly; 12a, flap; 12b, support rod; 13, connecting rod assembly; 13a, short rocker arm; 13b, long rocker arm; 14, rotating shaft; 15, first sealing ring; 16, second sealing ring; 17, wire baffle; 18, guide plate; 18a, guide groove; 18b, installation edge; 19, cover. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] Combination Figures 1 to 5 As shown, a damper driving structure of a ventilation fan for a cabin includes a fan bracket 10 and a shutter assembly 12 installed on the fan bracket 10, a connecting rod assembly 13 is linked to the shutter assembly 12, and also includes a screw transmission assembly, the screw transmission assembly includes a base body 1, and a motor 7 and a screw 5 installed on the base body 1, the output shaft of the motor 7 is connected to one end of the screw 5, and a screw nut 6 is screwed on the screw 5; the fan bracket 10 has a boss 10a, the base body 1 is installed on the surface of the boss 10a, the connecting rod assembly 13 includes a short rocker arm 13a, and the screw nut 6 is hinged to one end of the short rocker arm 13a. Furthermore, the back side of the boss 10a is provided with a groove 10b; the boss 10a is arranged with a plurality of vents 10c; waist-shaped grooves 10d are respectively arranged on both sides of each vent 10c; the connecting rod assembly 13 includes a long rocker arm 13b and the short rocker arm 13a; one end of the short rocker arm 13a is hinged to one end of the long rocker arm 13b; the shutter assembly 12 includes a plurality of arranged flaps 12a, and a support rod 12b is arranged on the front side of each flap 12a; the flap 12a is installed in the groove 10b at a position corresponding to the vent 10c, and the upper parts of the two ends of the flap 12a are connected to the two side walls of the groove 10b through a rotating shaft 14; the support rod 12b passes through the waist-shaped groove 10d of the boss 10a and is hinged to the long rocker arm 13b.

[0035] By adopting the above structure, its working principle is: each flap 12a can rotate around the rotating shaft 14. When the shutter needs to be opened or closed, the motor 7 drives the screw 5 to rotate, and then drives the screw nut 6 to move along the axis of the screw 5. Since the screw nut 6 is hinged to one end of the short rocker arm 13a, it can drive the long rocker arm 13b to move, and then drive the flap 12a to rotate around the rotating shaft 14 through the support rod 12b, thereby controlling the flap 12a to open or close.

[0036] Combination Figure 1 , Figure 2 As shown, in this embodiment, there are two screw drive assemblies, which are respectively installed on the surface of the boss 10a near the two sides; there are two connecting rod assemblies 13, and each screw drive assembly is provided with a corresponding connecting rod assembly 13; there are two supporting rods 12b on each flap 12a, and the two supporting rods 12b are respectively passed through the waist grooves 10d on both sides of the vent 10c and are respectively hinged to the corresponding long rocker arms 13b. By using two sets of screw drive assemblies to drive the flap 12a on the shutter to open or close, when one set of screw drive assemblies fails, the other set can still continue to work, thereby ensuring the stability of the entire damper drive structure.

[0037] Combination Figure 1 As shown, a first sealing ring 15 is provided at the position corresponding to each vent 10c in the sink 10b, and the first sealing ring 15 is bonded to the bottom wall of the sink 10b; when the flap 12a is closed, the surface of the flap 12a is attached to the end face of the first sealing ring 15. The purpose of providing the first sealing ring 15 is to play a sealing role at the vent 10c when the flap 12a is closed. Similarly, a second sealing ring 16 is provided at the position corresponding to each waist-shaped groove 10d in the sink 10b, and the second sealing ring 16 is fixedly installed on the bottom wall of the sink 10b by screws. When the flap 12a is closed, the surface of the flap 12a is attached to the end face of the second sealing ring 16. The purpose of providing the second sealing ring 16 is to play a sealing role at the waist-shaped groove 10d when the flap 12a is closed.

[0038] Combination Figure 1 , Figure 2 As shown, a wire baffle plate 17 is provided above the topmost vent 10c, and the wire baffle plate 17 is composed of a first plate body and a second plate body and has an L-shaped cross-section. The first plate body of the wire baffle plate 17 is fixedly mounted on the surface of the boss 10a by bolts, and the second plate body of the wire baffle plate 17 is perpendicular to the surface of the boss 10a. The wire baffle plate 17 is provided to play the role of blocking the wire, so that the cables of the motor 7 can be prevented from falling to the vent 10c and affecting the ventilation effect.

[0039] Combination Figure 1 , Figure 2 As shown, a guide plate 18 is provided at the position of the bottom vent 10c; the guide plate 18 has a guide groove 18a inside, and the guide groove 18a is connected to the bottom vent 10c; a mounting edge 18b is extended at the bottom of the guide plate 18; the mounting edge 18b is fixedly mounted on the surface of the boss 10a by bolts. The guide plate 18 can be provided to guide the wind flowing through the bottom vent 10c upward.

[0040] Combination Figure 1 , Figure 3 As shown, a cover 19 is provided on the surface of the boss 10a, and the cover 19 covers the lead screw transmission assembly and the connecting rod assembly 13 in its inner cavity. By providing the cover 19, dust and impurities can be prevented from entering the lead screw 5 and affecting the transmission accuracy.

[0041] Combination Figures 6 to 9 As shown, the seat body 1 has a U-shaped groove with an open top, and a partition 2 is arranged in the middle of the U-shaped groove; the partition 2 divides the U-shaped groove of the seat body 1 into a first compartment 3 and a second compartment 4; the motor 7 is arranged in the second compartment 4; the lead screw 5 and the lead screw nut 6 are arranged in the first compartment 3; a U-shaped opening 2a with an open top is arranged at the top center of the partition 2; the output shaft of the motor 7 passes through the U-shaped opening 2a and is connected to the lead screw 5; a screw through hole 2b is arranged in the partition 2 for fixing the motor 7 through the screw. The seat body 1 provides installation space for the lead screw 5, the lead screw nut 6 and the motor 7, so that the ventilation fan for the square cabin adopts a lead screw drive to control the opening and closing of the shutter.

[0042] Furthermore, a support block 8 is provided on the bottom plate of the first compartment 3 at one end away from the partition 2, and a bearing mounting hole 8a is provided on the support block 8. The bearing mounting hole 8a is a countersunk hole, and the open end of the bearing mounting hole 8a faces the partition 2. A bearing is provided in the bearing mounting hole 8a, and the end of the screw 5 away from the motor 7 is inserted in the inner ring of the bearing, which supports the screw 5 and prevents the screw 5 from forming a cantilever structure, which is beneficial to ensure that the axis of the screw 5 coincides with the axis of the motor 7, thereby ensuring the stability of the transmission.

[0043] Combination Figure 7 , Figure 8 As shown, an oil injection hole 8b is provided on the outer surface of the support block 8 away from the partition plate 2, and the oil injection hole 8b is connected to the bearing mounting hole 8a; the oil injection hole 8b is coaxially arranged with the bearing mounting hole 8a. The oil injection hole 8b is used to inject lubricating butter to lubricate the bearing in the bearing mounting hole 8a.

[0044] Combination Figure 6 , Figure 8As shown, a connecting plate 9 is formed on the bottom plate of the first compartment 3 and extends away from the end surface of the partition 2, and a first bolt through hole 9a is provided on the connecting plate 9; and a second bolt through hole 4a is provided on the bottom plate of the second compartment 4. When the motor mounting seat is installed on the boss 10a of the fan bracket 10, two bolts are respectively passed through the first bolt through hole 9a and the second bolt through hole 4a to fix the entire motor mounting seat on the boss 10a of the fan bracket 10. Specifically, the bolt passes through the first bolt through hole 9a and the second bolt through hole 4a from the back of the boss of the fan bracket 10 and then connects with the hexagonal nut column 11. When the cover 19 covers the screw transmission assembly and the connecting rod assembly 13 in its inner cavity, the cover 19 is connected to the hexagonal nut column 11 by screws passing through the cover 19, thereby fixing the cover 19.

[0045] Combination Figures 6 to 9 As shown, the top surface of the bottom plate of the first chamber 3 is a plane, and the roughness is not greater than Ra0.8; the top surface of the bottom plate of the first chamber 3 is used for sliding cooperation with the bottom surface of the screw nut 6. The screw nut 6 is a hexagonal structure. During the movement of the screw nut 6 along the axis of the screw 5, the bottom surface of the screw nut 6 forms a sliding cooperation with the top surface of the bottom plate of the first chamber 3. Therefore, in order to ensure the smoothness of sliding, the roughness of the top surface of the bottom plate of the first chamber 3 is required to be no greater than Ra0.8. Further, a T-slot 3a is provided on the bottom plate of the first chamber 3 for sliding installation of a T-bolt (not shown in the figure); the T-slot 3a is parallel to the long direction of the seat body 1. The T-bolt passes through the T-slot 3a and is threadedly connected with the screw nut 6, and the T-head of the T-bolt slides with the T-slot 3a. Therefore, the purpose of setting the T-slot 3a is to install the T-bolt, thereby ensuring the stability of the movement of the screw nut 6. There are two T-slots 3a, which are arranged parallel to each other and spaced apart. The purpose of setting two T-slots 3a is to further ensure the stability of the movement of the lead screw nut 6. A first through hole 3b is arranged at the end of one of the T-slots 3a close to the partition 2; a second through hole 3c is arranged at the end of the other T-slot 3a away from the partition 2; the first through hole 3b and the second through hole 3c both pass through the bottom plate of the first compartment 3. The purpose of setting the first through hole 3b and the second through hole 3c is to facilitate the installation of T-bolts, that is, during assembly, the T-bolts are inserted from the first through hole 3b and the second through hole 3c and threadedly connected with the lead screw nut 6, and the T-nuts slide into the T-slot 3a from the first through hole 3b and the second through hole 3c. The reason why the first through hole 3b and the second through hole 3c are arranged at the two end positions is to prevent the two T-bolts from falling off from the T-slot 3a at the same time.

[0046] Combination Fig. 9As shown, there are two screw holes 2b, which are symmetrically distributed on both sides of the U-shaped opening 2a. The function of the screw holes 2b is to fix the motor 7, that is, the screws pass through the screw holes 2b and are connected and fixed to the front end surface of the motor 7. The purpose of the screw holes 2b being symmetrically located on both sides of the U-shaped opening 2a is to ensure that the screw pre-tightening force applied to the motor 7 when it is fixed is evenly distributed.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made under the concept of the present invention using the contents of the specification and drawings of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A damper driving structure of a ventilation fan for a shelter, comprising a fan bracket (10) and a shutter assembly (12) mounted on the fan bracket (10), wherein a connecting rod assembly (13) is linked to the shutter assembly (12), characterized in that: The fan bracket (10) also includes a screw transmission assembly, which includes a base (1), a motor (7) and a screw (5) mounted on the base (1), wherein the output shaft of the motor (7) is connected to one end of the screw (5), and a screw nut (6) is screwed onto the screw (5); the fan bracket (10) has a boss (10a), the base (1) is mounted on the surface of the boss (10a), the connecting rod assembly (13) includes a short rocker arm (13a), and the screw nut (6) is hinged to one end of the short rocker arm (13a).

2. The damper driving structure of the ventilation fan for a shelter as claimed in claim 1, characterized in that: The back side of the boss (10a) is provided with a sink groove (10b); the boss (10a) is provided with a plurality of vents (10c) arranged in an array; waist-shaped grooves (10d) are respectively provided on both sides of each vent (10c); The connecting rod assembly (13) comprises a long rocker arm (13b) and the short rocker arm (13a); one end of the short rocker arm (13a) is hinged to one end of the long rocker arm (13b); The shutter assembly (12) comprises a plurality of flaps (12a) arranged in an array, and a support rod (12b) is arranged on the front side of each flap (12a); the flap (12a) is installed in the sink (10b) at a position corresponding to the vent (10c), and the upper parts of both ends of the flap (12a) are connected to the two side walls of the sink (10b) through a rotating shaft (14); the support rod (12b) passes through the waist groove (10d) of the boss (10a) and is hinged to the long rocker arm (13b).

3. The damper driving structure of the ventilation fan for a shelter as claimed in claim 2, characterized in that: There are two screw transmission assemblies, which are respectively installed on the surface of the boss (10a) near the two sides; there are two connecting rod assemblies (13), and each screw transmission assembly is provided with a corresponding connecting rod assembly (13); there are two supporting rods (12b) on each flap (12a), and the two supporting rods (12b) are respectively passed through the waist grooves (10d) on both sides of the ventilation opening (10c) and are respectively hinged to the corresponding long rocker arms (13b).

4. The damper driving structure of the ventilation fan for a shelter as claimed in claim 2, characterized in that: A first sealing ring (15) is provided in the sink (10b) at a position corresponding to each vent (10c), and the first sealing ring (15) is bonded to the bottom wall of the sink (10b); when the flap (12a) is closed, the surface of the flap (12a) is attached to the end surface of the first sealing ring (15).

5. The damper driving structure of the ventilation fan for a shelter as claimed in claim 2, characterized in that: A second sealing ring (16) is provided in the sink (10b) at a position corresponding to each waist-shaped groove (10d), and the second sealing ring (16) is fixedly mounted on the bottom wall of the sink (10b) by means of screws; when the flap (12a) is closed, the surface of the flap (12a) is in contact with the end surface of the second sealing ring (16).

6. The damper driving structure of the ventilation fan for a shelter as claimed in claim 2, characterized in that: A baffle plate (17) is arranged above the topmost vent (10c), the baffle plate (17) having an L-shaped cross-section structure consisting of a first plate body and a second plate body, the first plate body of the baffle plate (17) being fixedly mounted on the surface of the boss (10a) by bolts, and the second plate body of the baffle plate (17) being perpendicular to the surface of the boss (10a).

7. The damper driving structure of the ventilation fan for a shelter as claimed in claim 2, characterized in that: A guide plate (18) is arranged at the position of the lowest ventilation opening (10c); a guide groove (18a) is provided inside the guide plate (18), and the guide groove (18a) is connected to the lowest ventilation opening (10c); a mounting edge (18b) is extended at the lower part of the guide plate (18); and the mounting edge (18b) is fixedly mounted on the surface of the boss (10a) by bolts.

8. The damper driving structure of the ventilation fan for a shelter as claimed in claim 1, characterized in that: A cover (19) is arranged on the surface of the boss (10a), and the cover (19) covers the screw transmission assembly and the connecting rod assembly (13) in its inner cavity.

9. The damper driving structure of the ventilation fan for a shelter as claimed in claim 1, characterized in that: The seat body (1) has a U-shaped groove with an open top, and a partition (2) is arranged in the middle of the U-shaped groove; the partition (2) divides the U-shaped groove of the seat body (1) into a first compartment (3) and a second compartment (4); the motor (7) is arranged in the second compartment (4); the lead screw (5) and the lead screw nut (6) are arranged in the first compartment (3); a U-shaped opening (2a) with an open top is arranged in the center of the top of the partition (2); the output shaft of the motor (7) passes through the U-shaped opening (2a) and is connected to the lead screw (5); a screw through hole (2b) is arranged in the partition (2) for passing a screw to fix the motor (7).

10. The damper driving structure of the ventilation fan for a shelter as claimed in claim 9, characterized in that: A support block (8) is arranged on the bottom plate of the first chamber (3) at one end away from the partition (2), and a bearing mounting hole (8a) is arranged on the support block (8). The bearing mounting hole (8a) is a countersunk hole, and the open end of the bearing mounting hole (8a) faces the partition (2). A bearing is arranged in the bearing mounting hole (8a), and the end of the lead screw (5) away from the motor (7) is inserted into the inner ring of the bearing.

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