Rotary damper for venetian blinds

Abstract

The application discloses a rotating damper for a venetian blind, and aims to provide a rotating damper for a venetian blind with good damping effect. The rotating damper comprises a mounting box, a driving gear connected with a blind rod in the mounting box, a driven gear connected with the driving gear, a rotating screw connected with the driven gear, one end of the rotating screw being rotationally connected with the mounting box, a damping wheel connected with the other end of the rotating screw, a damping box sleeved with the damping wheel outside, the damping box being connected with the mounting box, the damping wheel being provided with swingable damping sheets, and the damping sheets being corresponding to the inner wall of the damping box. The rotating damper has the beneficial effect that the damping effect is ensured to be good, and the use effect of the venetian blind is ensured to be good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of venetian blinds, in particular to a rotating damper for a venetian blind. BACKGROUND

[0002] When the venetian blind is in the process of being lowered, the gravity of the blind cloth and the counterweight of the lower beam is used to realize the self-falling. When the blind is being lowered, the damping effect of the existing damper for the venetian blind is poor, and as the position of the lowered blind cloth descends, the speed of the lowered blind cloth is faster and faster, and when the lowest end is reached, the impact is greater, so the damage to the blind is greater, resulting in the destruction of the venetian blind.

[0003] Chinese patent authorization announcement number: CN 2729287 Y, authorization announcement date: 2005.09.28, a new structure damper, the shell and the Roman curtain upper beam are integrated into one, and the whole is connected in series on the Roman curtain rotating shaft. When the Roman curtain is automatically lowered, the Roman curtain rotating shaft also rotates, and the rotating shaft speed and the lowering speed are consistent. That is, the rotating shaft speed is controlled, and the lowering speed is controlled. The damper is connected in series on the Roman curtain rotating shaft, and when the Roman curtain rotating shaft rotates, the inner ring gear of the damper rotates. The rotation of the small gear frame in the damper is powered by the meshing of one or more transition gears and the inner ring gear, and the meshing of one or more transition gears and the small gears on the small gear frame. When the small gear frame rotates counterclockwise, the two eccentric blocks mounted on the small gear frame rotate, and they are thrown outward due to the centrifugal force. In this way, the two brake pads mounted on the eccentric blocks are attached to the inner wall of the brake sleeve to generate friction. This friction hinders the continued rotation of the rotating shaft, that is, the rotation of the rotating shaft is damped, and the lowering speed is reduced. SUMMARY

[0004] The present application is to overcome the poor damping effect of the prior art, and provides a rotating damper for a venetian blind with good damping effect.

[0005] In order to achieve the above-mentioned purpose, the following technical scheme is adopted in the present application: a rotating damper for a venetian blind, comprising a mounting box, a driving gear connected with a blind rod is connected in the mounting box, a driven gear connected with the driving gear, a rotating screw connected with the driven gear, one end of the rotating screw is rotatably connected with the mounting box, the other end of the rotating screw is connected with a damping wheel, a damping box is sleeved outside the damping wheel, the damping box is connected with the mounting box, the damping wheel is provided with a swingable damping piece, and the damping piece corresponds to the inner wall of the damping box.

[0006] The installation box is connected with a driving gear, the driving gear is connectable with the curtain rod, the driving gear and the driven gear are in meshing connection, and the driven gear is connected with a rotating screw rod, one end of the rotating screw rod is rotatably connected with the installation box, the other end of the rotating screw rod is connected with a damping wheel, the damping wheel is provided with damping pieces, the outer side of the damping wheel is sleeved with a damping box, the damping pieces are arranged in the damping box, and the damping box is fixed in the installation box. When the louver curtain is opened, the curtain rod drives the driving gear to rotate, and the driven gear drives the rotating screw rod to rotate, when the rotating screw rod rotates, the damping pieces arranged on the damping wheel are in contact with the inner wall of the damping box under the centrifugal motion, as the position of the louver curtain is lowered, the rotating speed of the curtain rod is increased, the centrifugal force generated by the damping pieces is increased, and the friction between the damping pieces and the inner wall of the damping box is increased, so that the damping effect is good, and the impact force generated when the curtain is opened is smaller, and the safety of the louver curtain is ensured.

[0007] As preferred, the installation box is provided with a clearance hole, the inner wall of the installation box is provided with a fixing ring, the fixing ring is coaxially arranged with the clearance hole, the driving gear is provided with a connecting ring, the connecting ring is sleeved with the fixing ring, the driving gear is provided with a mounting hole connected with the curtain rod, and the mounting hole is coaxially arranged with the clearance hole. The fixing ring is arranged on the inner wall of the installation box and sleeved with the connecting ring arranged on the driving gear, so that the installation position of the driving gear is ensured, the mounting hole is arranged on the driving gear, and the mounting hole is coaxially arranged with the clearance hole arranged on the installation box, so that the curtain rod can pass through the clearance hole and be connected with the mounting hole, the connection between the curtain rod and the driving gear is realized, when the curtain is opened, the driving gear transmits the opening speed of the curtain to the damping wheel through the driven gear, the damping effect is realized, the impact force of the louver curtain is reduced when the curtain is opened, and the safety of the louver curtain is ensured.

[0008] As preferred, the driven gear comprises a main gear, a secondary gear and an installation shaft, the main gear is connected with the secondary gear in a stacking mode, the installation shaft passes through the main gear and the secondary gear in sequence and is connected with the installation box at both ends, the main gear is in meshing connection with the driving gear, and the secondary gear is in meshing connection with the rotating screw rod. The main gear is stacked on the secondary gear, the installation shaft passes through the main gear and the secondary gear in sequence and is connected with the installation box, the main gear is in meshing connection with the driving gear, and the secondary gear is in meshing connection with the rotating screw rod, so that the transition transmission effect of the driven gear is ensured, and the damping effect is good.

[0009] As preferred, the auxiliary gear top surface is provided with a mounting groove, a torsion spring one is connected in the mounting groove, a mounting block is connected below the main gear, the mounting block is sleeved with the mounting groove, a mounting clamping groove is arranged on the sidewall below the mounting block, the mounting block is sleeved with the mounting shaft sleeve, one end of the torsion spring one is connected with the inner wall of the mounting groove, and the other end of the torsion spring one is clamped with the mounting clamping groove. The auxiliary gear is provided with a mounting groove, a torsion spring one is connected in the mounting groove, a mounting block is connected below the main gear, the mounting block is sleeved with the mounting groove, a mounting clamping groove is arranged on the sidewall of the mounting block, an end of the torsion spring one is clamped with the mounting clamping groove, the torsion spring one arranged can play a certain damping effect when the driven gear realizes intermediate transition transmission effect, ensure that a certain damping deceleration effect is played when the transition transmission speed is ensured, the damping effect is good, and the use of the louver curtain piece is safe.

[0010] As preferred, the mounting box inner sidewall is provided with a mounting clamping block, the mounting clamping block is provided with a limiting clamping groove, and the rotating screw is connected with the limiting clamping groove. The opening direction of the limiting clamping groove arranged on the mounting clamping block is upward, the limiting clamping groove is a U-shaped groove, the rotating screw is conveniently clamped into the limiting clamping groove, the connecting operation is simple and convenient, and the structure is simple.

[0011] As preferred, the damping wheel is provided with a connecting sleeve pipe, the rotating screw is sleeved with the connecting sleeve pipe, a torsion spring two is arranged between the rotating screw and the connecting sleeve pipe, the connecting sleeve pipe is provided with a connecting clamping groove, one end of the torsion spring two is connected with the rotating screw, and the other end of the torsion spring two is clamped with the connecting clamping groove. The connecting sleeve pipe arranged on the damping wheel is connected with a torsion spring two, the connecting clamping groove is arranged on the connecting sleeve pipe, one end of the torsion spring two is clamped into the connecting clamping groove, the end of the rotating screw is inserted into the torsion spring two arranged in the connecting sleeve pipe, the other end of the torsion spring two is connected with the rotating screw, the certain damping effect is generated between the rotating screw and the damping wheel when the rotating screw rotates, a certain damping deceleration effect is played when the transition transmission speed is ensured, the damping effect is good, and the use of the louver curtain piece is safe.

[0012] As preferred, the damping wheel end surface is provided with a connecting block, the connecting block is connected with a connecting rod, the damping box bottom is provided with a connecting hole, and the connecting rod is sleeved with the connecting hole. The connecting rod connected to the connecting block arranged on the damping wheel is sleeved with the connecting hole arranged at the bottom of the damping box, the stability of the damping wheel rotation is ensured, the damping effect is good, and the use of the louver curtain piece is safe.

[0013] As preferred, the damping wheel is provided with a limiting block, the damping sheet comprises a connecting sheet and two connecting arms which are centrally symmetrical, the connecting sheet is provided with a clamping hole which is sleeved with the connecting block, and the connecting arms are arranged in the limiting block. The damping sheet is composed of the connecting sheet and the two connecting arms arranged on the connecting sheet, the two connecting arms are centrally symmetrical, the clamping hole is arranged on the connecting sheet and is sleeved with the connecting block, so that the connecting stability of the damping sheet is ensured, the limiting block arranged on the damping wheel clamps the connecting arms, the connection of the damping sheet is ensured, the damping effect of the damping sheet is stable, and the use safety of the louver curtain sheet is ensured.

[0014] As preferred, the end of the connecting arm is connected with a connecting swing sheet, the outer end surface of the connecting swing sheet is an arc surface, and the connecting swing sheet corresponds to the inner wall of the damping box. The outer side wall of the connecting swing sheet connected with the end of the connecting arm is an arc surface, under the rotating action of the damping wheel, the connecting swing sheet arranged on the damping sheet can swing outward, so that the outer end surface of the connecting swing sheet contacts the inner wall of the damping box and generates a friction force, the damping effect is realized, with the increase of the rotating speed, the outward swing angle of the connecting swing sheet increases, the centrifugal force generated by rotation is converted into a friction force, the damping effect is good, and the use safety of the louver curtain sheet is ensured.

[0015] As preferred, the inner wall of the mounting box is provided with a fixed clamping groove, the outer wall of the damping box is connected with a fixed clamping block, and the fixed clamping block is clamped with the fixed clamping groove. The fixed clamping groove is arranged on the mounting box, the opening end of the fixed clamping groove faces upward, the fixed clamping block is arranged on the damping box and is inserted into the fixed clamping groove, so that the structure is simple and the installation is convenient.

[0016] The beneficial effects of the present application are that: the rotation of the curtain rod is transmitted to the rotation of the damping wheel through the driving gear, the driven gear and the rotating screw, the damping sheet arranged on the damping wheel generates a centrifugal force, the connecting swing sheet swings outward, the connecting swing sheet contacts the inner wall of the damping box and generates a friction force, the damping effect is realized, the friction force increases with the increase of the rotating speed, the damping effect is good, the use effect of the louver curtain is good, the torsional spring one arranged in the driven gear and the torsional spring two arranged in the connecting sleeve also have the damping deceleration effect, and the damping effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is the internal perspective view of the present application;

[0018] Fig. 2 is the front view of the present application;

[0019] Fig. 3 is the sectional view of A-A in the present application;

[0020] Fig. 4 is the sectional view of B-B in the present application;

[0021] Fig. 5 is the cross-sectional view at C-C in the present application;

[0022] Fig. 6 is the perspective view of the connection between the rotating screw and the damping wheel in the present application.

[0023] In the drawings,

[0024] 1. mounting box, 2. driving gear, 3. driven gear, 4. rotating screw, 5. damping wheel, 6. damping box, 7. damping piece, 10. let-out hole, 11. fixing ring, 12. mounting block, 13. limiting block slot, 14. fixing block slot, 20. connecting ring, 21. mounting hole, 30. main gear, 31. auxiliary gear, 32. mounting shaft, 33. mounting slot, 34. torsion spring I, 35. mounting block, 36. mounting block slot, 50. connecting sleeve, 51. torsion spring II, 52. connecting block slot, 53. connecting block, 54. connecting rod, 55. connecting hole, 56. limiting block, 60. fixing block, 70. connecting piece, 71. connecting arm, 72. clamping hole, 73. connecting swing piece. DETAILED DESCRIPTION

[0025] The application will be further described below in conjunction with the drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application or its application or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0026] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components illustrated in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0028] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0029] Example 1, as Figs. 1-6 As shown, a rotary damper for blinds includes a mounting box 1. A drive gear 2, connected to a curtain rod, is located inside the mounting box 1. The drive gear 2 is connected to a driven gear 3, and the driven gear 3 is connected to a rotating screw 4. One end of the rotating screw 4 is rotatably connected to the mounting box 1, and the other end is connected to a damping wheel 5. A damping box 6 is sleeved on the outside of the damping wheel 5. The damping box 6 is connected to the mounting box 1. The damping wheel 5 is provided with a swingable damping plate 7, which corresponds to the inner wall of the damping box 6.

[0030] The mounting box 1 is provided with a clearance hole 10. The inner wall of the mounting box 1 is provided with a fixing ring 11. The fixing ring 11 is coaxially arranged with the clearance hole 10. The drive gear 2 is provided with a connecting ring 20. The connecting ring 20 is sleeved with the fixing ring 11. The drive gear 2 is provided with a mounting hole 21 for connecting with the curtain rod. The mounting hole 21 is coaxially arranged with the clearance hole 10.

[0031] The driven gear 3 includes a main gear 30, a secondary gear 31, and a mounting shaft 32. The main gear 30 and the secondary gear 31 are stacked and connected. The mounting shaft 32 passes through the main gear 30 and the secondary gear 31 in sequence and is connected to the mounting box 1 at both ends. The main gear 30 meshes with the driving gear 2, and the secondary gear 31 meshes with the rotating screw 4.

[0032] The top surface of the sub-gear 31 is provided with a mounting groove 33, a torsion spring I 34 is connected in the mounting groove 33, a mounting block 35 is arranged below the main gear, the mounting block 35 is sleeved in the mounting groove 33, a mounting clamping groove 36 is arranged on the side wall below the mounting block 35, the mounting block 35 is sleeved with the mounting shaft 32, one end of the torsion spring I 34 is connected with the inner wall of the mounting groove 33, and the other end of the torsion spring I 34 is clamped with the mounting clamping groove 36.

[0033] The inner wall of the mounting box 1 is provided with a mounting clamping block 12, the mounting clamping block 12 is provided with a limiting clamping groove 13, and the rotating screw 4 is connected with the limiting clamping groove 13.

[0034] The damping wheel 5 is provided with a connecting sleeve 50, the rotating screw 4 is sleeved with the connecting sleeve 50, a torsion spring II 51 is arranged between the rotating screw 4 and the connecting sleeve 50, the connecting sleeve 50 is provided with a connecting clamping groove 52, one end of the torsion spring II 51 is connected with the rotating screw 4, and the other end of the torsion spring II 51 is clamped with the connecting clamping groove 52.

[0035] The end surface of the damping wheel 5 is provided with a connecting block 53, the connecting block 53 is connected with a connecting rod 54, the bottom of the damping box 6 is provided with a connecting hole 55, and the connecting rod 54 is sleeved with the connecting hole 55.

[0036] The damping wheel 5 is provided with a limiting clamping block 56, the damping piece 7 comprises a connecting piece 70 and two connecting arms 71, the connecting arms 71 are connected with the connecting piece 70 and are centrally symmetrical, the connecting piece 70 is provided with a clamping hole 72, the clamping hole 72 is sleeved with the connecting block 53, and the connecting arms 71 are arranged in the limiting clamping block 56.

[0037] The end of the connecting arm 71 is connected with a connecting swing piece 73, the outer end surface of the connecting swing piece 73 is an arc surface, and the connecting swing piece 73 corresponds to the inner wall of the damping box 6.

[0038] The inner wall of the mounting box 1 is provided with a fixed clamping groove 14, the outer wall of the damping box 6 is connected with a fixed clamping block 60, and the fixed clamping block 60 is clamped with the fixed clamping groove 14.

[0039] The use working principle of the present application is as follows: Figs. 1-6As shown, the mounting box 1 is provided with a clearance hole 10, and a fixing ring 11 is arranged on the inner wall of the mounting box 1. The end surface of the driving gear 2 in the mounting box 1 is provided with a connecting ring 20, the connecting ring 20 is rotatably sleeved with the fixing ring 11, and a mounting hole 21 is arranged on the driving gear 2. The clearance hole 10 and the mounting hole 21 are coaxially arranged, so that the curtain rod is connected by passing through the clearance hole 10 and the mounting hole 21 arranged on the driving gear 2, and the rotation speed of the curtain rod is transmitted to the driving gear 2. The driven gear 3 arranged in the mounting box 1 comprises a main gear 30, a secondary gear 31 and a mounting shaft 32. The mounting shaft 32 is fixed on the inner wall of the mounting box 1, the main gear 30 and the secondary gear 31 are connected in a stack, and the main gear 30 is arranged above the secondary gear 31. At the same time, the main gear 30 and the secondary gear 31 are sleeved with the mounting shaft 32, the main gear 30 is engaged with the driving gear 2, and the secondary gear 31 is engaged with the rotating screw 4 arranged in the mounting box 1. An installation groove 33 is arranged on the upper surface of the secondary gear 31, a torsion spring 34 is arranged in the installation groove 33, an installation block 35 is arranged below the main gear 30, the installation block 35 is arranged in the torsion spring 34 arranged in the installation groove 33, and an installation clamping groove 36 is arranged on the side wall of the installation block 35. One end of the torsion spring 34 is connected with the inner wall of the installation groove 33, and the other end is clamped with the installation clamping groove 36. When the driven gear 3 transmits the rotation speed, the main gear 30 and the secondary gear 31 can realize the speed reduction damping effect under the action of the torsion spring 34, and can improve the damping effect of the overall structure.

[0040] A mounting clamping block 12 is arranged on the inner wall of the mounting box 1, a limiting clamping groove 13 is arranged on the mounting clamping block 12, the limiting clamping groove 13 is a U-shaped groove, the opening end of the limiting clamping groove 13 faces upward, one end of the rotating screw 4 is clamped into the limiting clamping groove 13, and the rotating screw 4 can be rotatably connected with the limiting clamping groove 13. The other end of the rotating screw 4 is connected with the connecting sleeve 50 arranged on the damping wheel 5, a torsion spring 51 is arranged in the connecting sleeve 50, and a connecting clamping groove 52 is arranged on the side wall of the connecting sleeve 50. One end of the torsion spring 51 is connected with the rotating screw 4, and the other end is clamped with the connecting clamping groove 52. When the rotating screw 4 rotates, the torsion spring 51 can realize the speed reduction damping effect, and can improve the damping effect of the overall structure.

[0041] The connecting block 53 is arranged on the end surface of the damping wheel 5, and the connecting rod 54 is connected to the connecting block 53. Meanwhile, the damping box 6 is sleeved on the outer side of the damping wheel 5, the fixing clamping groove 14 is arranged on the inner wall of the installation box 1, the fixing clamping block 60 is arranged on the outer wall of the damping box 6, and the fixing clamping block 60 is inserted into the fixing clamping groove 14, so as to ensure the stable installation of the damping box and the convenient and simple installation. The connecting hole 55 is arranged on the inner bottom surface of the damping box 6, and the connecting rod 54 is rotatably sleeved with the connecting hole 55. Through the sleeving of the connecting rod 54 and the connecting hole 55, the damping wheel 5 can be stably rotated, and the damping effect is ensured to be good. The damping sheet 7 is connected by the connecting sheet 70 and two connecting arms 71, and the two connecting arms 71 are respectively arranged on the two sides of the connecting sheet 70 and are centrally symmetric. The connecting sheet 70 is provided with the clamping hole 72, the clamping hole 72 is sleeved with the connecting block 53, the limiting clamping block 56 is arranged on the end surface of the damping wheel 5, the connecting arm 71 is clamped in the limiting clamping block 56, and the connecting stability of the damping sheet 7 is ensured. The connecting swing sheet 73 is connected to the end of the connecting arm 71, and the outer end surface of the connecting swing sheet 73 is an arc surface. When the damping wheel 5 rotates, the damping sheet 7 generates centrifugal force, the connecting swing sheet 73 swings outward under the action of the centrifugal force, the outer end surface of the connecting swing sheet 73 contacts the inner wall of the damping box 6 and generates friction, and then the damping effect is realized. With the descent of the louvered curtain sheet, the speed of the damping wheel 5 increases, the centrifugal force generated increases, the friction increases, the damping effect increases, the damping effect of the present application is ensured to be good, and the use effect of the louvered curtain sheet is ensured.

[0042] The above examples are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotary damper for a venetian blind, characterized by comprising: The system includes a mounting box (1), inside which is a drive gear (2) connected to a curtain rod. The drive gear (2) is connected to a driven gear (3), and the driven gear (3) is connected to a rotating screw (4). One end of the rotating screw (4) is rotatably connected to the mounting box (1), and the other end of the rotating screw (4) is connected to a damping wheel (5). A damping box (6) is sleeved on the outside of the damping wheel (5), and the damping box (6) is connected to the mounting box (1). The damping wheel (5) is provided with a swingable damping plate (7), which corresponds to the inner wall of the damping box (6). A connecting block (53) is provided on the end face of the damping wheel (5), and the connecting block (53) is connected to a... A connecting rod (54) is provided at the bottom of the damping box (6), and the connecting rod (54) is sleeved with the connecting hole (55). A limit block (56) is provided on the damping wheel (5). The damping plate (7) includes a connecting plate (70) and two connecting arms (71). The connecting arms (71) are connected to the connecting plate (70) and are centrally symmetrical. The connecting plate (70) is provided with a snap-fit ​​hole (72), and the snap-fit ​​hole (72) is sleeved with the connecting block (53). The connecting arm (71) is placed inside the limit block (56). A connecting swing plate (73) is connected to the end of the connecting arm (71). The outer end face of the connecting swing plate (73) is an arc-shaped surface. Corresponding to the inner wall of the damping box (6), the driven gear (3) includes a main gear (30), a secondary gear (31), and a mounting shaft (32). The main gear (30) and the secondary gear (31) are stacked and connected. The mounting shaft (32) passes through the main gear (30) and the secondary gear (31) in sequence and is connected to the mounting box (1) at both ends. The main gear (30) meshes with the driving gear (2). The secondary gear (31) meshes with the rotating screw (4). The top surface of the secondary gear (31) is provided with a mounting groove (33). A torsion spring (34) is connected in the mounting groove (33). A mounting block (35) is connected below the main gear (30). The mounting block (35) and the mounting groove (33) are connected. The mounting block (35) is fitted with a mounting slot (36) on its lower side wall. The mounting block (35) is fitted with the mounting shaft (32). One end of the torsion spring (34) is connected to the inner wall of the mounting groove (33), and the other end of the torsion spring (34) is engaged with the mounting slot (36). The damping wheel (5) is fitted with a connecting sleeve (50). The rotating screw (4) is fitted with the connecting sleeve (50). A torsion spring (51) is provided between the rotating screw (4) and the connecting sleeve (50). The connecting sleeve (50) is fitted with a connecting slot (52). One end of the torsion spring (51) is connected to the rotating screw (4), and the other end of the torsion spring (51) is engaged with the connecting slot (52).

2. A rotary damper for venetian blinds according to claim 1, characterized in that The mounting box (1) is provided with a let hole (10), the inner wall of the mounting box (1) is provided with a fixed ring (11), the fixed ring (11) is coaxially arranged with the let hole (10), the driving gear (2) is provided with a connecting ring (20), the connecting ring (20) is sleeved with the fixed ring (11), the driving gear (2) is provided with a mounting hole (21) connected with the curtain rod, the mounting hole (21) is coaxially arranged with the let hole (10).

3. A rotary damper for venetian blinds according to claim 1, characterized in that The inner side wall of the mounting box (1) is provided with a mounting clamping block (12), the mounting clamping block (12) is provided with a limiting clamping groove (13), the rotating screw rod (4) is connected with the limiting clamping groove (13).

4. A rotary damper for venetian blinds according to claim 1, wherein The inner wall of the mounting box (1) is provided with a fixed clamping groove (14), the outer wall of the damping box (6) is connected with a fixed clamping block (60), and the fixed clamping block (60) is clamped with the fixed clamping groove (14).

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