CN218216989U

CN218216989U - Electric device and related roller shutter system

Info

Publication number: CN218216989U
Application number: CN202222174415.3U
Authority: CN
Inventors: 武中华; 黄涛
Original assignee: Hangzhou Endless Window Energy Saving Technology Co ltd
Current assignee: Hangzhou Endless Window Energy Saving Technology Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2023-01-03
Anticipated expiration: 2032-08-17

Abstract

The utility model provides an electric device, which comprises a driving motor, a driven rotating part, a press switch, a press part, a press shaft and an internal resistance applying component, wherein the driven rotating part is arranged in a motor shell, the driven rotating part is connected with an output shaft of the driving motor and rotates in the same speed and the same direction with the output shaft, and the driven rotating part and the motor shell are arranged separately; the push switch is fixedly arranged in the motor shell and rotates in the same direction as the motor shell when the motor shell rotates; the motor shell is rotationally connected to the pressing shaft; the pressing piece is arranged on the pressing shaft and is used for pressing the pressing switch when the motor shell rotates reversely; and an internal resistance applying unit which applies internal resistance to the driven rotor when the driven rotor is rotated, and when the driven rotor is subjected to the external resistance, the resultant force slows down the rotational speed of the driven rotor or reverses the rotational direction of the driven rotor. And an associated roller shade system. When the driven rotating part is blocked, the motor can be controlled to rotate reversely.

Description

Electric device and related roller shutter system

Technical Field

The utility model belongs to the electrical equipment field especially relates to a by motor drive rotation, and receive the relatively slow device of rotational speed of driven article.

Background

The background information provided in this section relating to the present invention may not all be prior art, and there may be content that does not constitute prior art.

The electric device, a general power component, is a motor, and the driven rotating member connected with the electric device is driven by the motor to rotate.

Sometimes, as a need, when the driven rotating member encounters external resistance, it may be necessary to control the motor to rotate in reverse.

To this end, a switch is usually provided which remains normally open when the driven rotating member does not encounter resistance and which is pressed to be in a closed state when the driven rotating member encounters resistance, the change in state of the switch triggering an electrical signal which is used to control the motor to change the current direction of rotation, i.e. to rotate in the opposite direction.

When the switch is pressed, the switch can be changed to a position close to the pressing piece for pressing the switch, so that the switch is changed from a normally open state to a closed state.

The switch is normally disposed in the same housing as the motor and is not rotated by the rotation of the driven rotatable member, but is in a stationary state. Only when the driven rotation member encounters an external resistance, in this case, since the rotation speed of the driven rotation member is less than the rotation speed of the output of the motor, it may even occur that the rotation direction of the driven rotation member is opposite to the rotation direction of the output of the motor, so that the output of the motor is subjected to a reverse torque from the driven rotation member, and the mounting case mounting the motor and the switch is positionally changed, thereby moving the switch in the direction of the pressing member for pressing the switch.

However, in use, since the driven rotation member is subjected to an uncertain magnitude of external resistance, if the external resistance is sufficiently large, a reverse torque can be generated sufficiently large to cause a positional change of the mounting case in which the motor and the switch are mounted. If the external resistance is not large enough, the reverse torque may not be generated enough to change the position of the mounting housing to which the motor and the switch are mounted, so that the direction of rotation of the output of the motor is not changed as set after the driven rotating member is blocked, and the electric device is in an abnormal state.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to solve at least part of the above problems.

An object of the utility model is to provide an electric actuator, include:

a drive motor;

the driving motor is arranged in the motor shell, and an output shaft of the driving motor extends out of the motor shell;

the driven rotating part is connected to the output shaft of the driving motor, is separated from the motor shell, and is driven by the output shaft of the driving motor to rotate in the same speed and direction with the output shaft;

the push switch is fixedly arranged in the motor shell and rotates in the same direction as the motor shell when the motor shell rotates;

a pressing shaft connected to the motor housing, wherein, in the process of rotating the driving motor and the driven and rotated member at the same speed and the same direction, if the driven and rotated member is subjected to external resistance to slow down the rotating speed or reverse the rotating direction, the rotating speed of the output shaft of the driving motor and the rotating speed of the driven and rotated member have a speed difference to generate a torque, and the torque enables the motor housing provided with the driving motor to rotate relative to the pressing shaft along the direction opposite to the rotating direction of the output shaft of the driving motor;

the pressing piece is arranged on the pressing shaft, when the motor shell rotates reversely, the pressing switch rotates along with the motor shell in the same direction until the pressing piece abuts against the pressing piece and stops rotating, at the moment, the pressing switch is in a state of being pressed by the pressing piece, and the pressing switch in the pressing state triggers the driving motor which runs to run reversely; and

an internal resistance applying assembly connected to the driven rotating member, wherein when the driven rotating member rotates in the same speed and direction as the output shaft of the driving motor, the internal resistance applying assembly continuously applies an internal resistance opposite to the rotating direction of the driven rotating member to the driven rotating member, and when the external resistance is applied to the driven rotating member, the internal resistance applying assembly is also applied to the driven rotating member so as to slow down the rotating speed or reverse the rotating direction of the driven rotating member;

wherein the internal resistance applying assembly comprises:

the rotating ring is of an annular structure, is detachably connected with the driven rotating part, and rotates in the same direction as the driven rotating part when the driven rotating part rotates; and

the friction fit piece is sleeved with the rotating ring, and when the rotating ring rotates, at least one part on the inner side surface of the rotating ring rubs with at least one part on the outer surface of the friction fit piece along the rotating direction of the rotating ring so as to generate a first internal resistance opposite to the rotating direction of the rotating ring.

Optionally, the internal resistance applying assembly further comprises:

the rotating convex part is arranged on the inner side surface of the rotating ring in a protruding mode along the radial direction of the rotating ring and arranged along the rotating direction of the rotating ring, and when the rotating ring rotates, the rotating convex part rotates along the same direction of the rotating ring;

the friction fitting comprises:

a first friction fit sub;

the second friction fit sub-piece and the first friction fit sub-piece are independent respectively and arranged at intervals, and the rotating convex part is arranged in the interval between the first friction fit sub-piece and the second friction fit sub-piece; and

the interval adjusting subassembly is arranged between the first friction fit sub-component and the second friction fit sub-component and is used for adjusting the positions of the first friction fit sub-component and the second friction fit sub-component relative to the rotating convex part positioned in the interval, and the rotating convex part generates friction with the first friction fit sub-component and/or the second friction fit sub-component during rotation so as to generate second internal resistance opposite to the rotating direction of the rotating convex part;

when the rotating ring rotates, at least one part on the inner side surface of the rotating ring rubs with at least one part on the outer surface of the first friction fit part and/or the second friction fit part along the rotating direction of the rotating ring, so that the rotating ring receives the first internal resistance opposite to the rotating direction of the driven rotating member.

Optionally, the number of the rotating convex parts is a plurality, and the rotating convex parts are arranged at intervals in sequence along the rotating direction of the rotating ring and form an annular structure.

Optionally, the rotating convex portion is bent at least once along the axial direction of the rotating ring to form a plurality of rotating bent sections, and through the interval adjusting subassembly, the first friction fit sub-component and the second friction fit sub-component are respectively in contact with at least one rotating bent section on the rotating convex portion.

Optionally, each of the rotating protrusions is obliquely disposed on the inner side surface of the rotating ring.

Optionally, the inclination directions of every two adjacent rotating convex parts relative to the inner side surface of the rotating ring are opposite to each other and are arranged in a staggered manner.

Optionally, the length of the rotating protrusion along the radial direction of the rotating ring ranges from 2 mm to 5mm.

Optionally, the rotating ring, the rotating convex part and the friction fitting piece are all made of engineering plastics;

the rotating ring and the rotating convex part are connected into a whole.

Optionally, a grease layer is provided on the rotating ring and/or the friction fit element, the kinematic viscosity range of the base oil of the grease layer being dependent on the rotational speed of the driven rotating element, the grease layer being configured to increase the magnitude of the first internal resistance exerted on the rotating ring.

Optionally, the method further includes: the rotation angle limiting part is arranged between the motor shell and the pressing shaft so as to limit the rotation angle range of the motor shell rotating around the pressing shaft when the motor shell rotates.

Optionally, the inner radius of the rotating ring is 0.5-2.5mm larger than the outer radius of the friction fitting.

Based on the above-mentioned purpose, the utility model provides a roll up curtain system, include:

an electrically powered device as described above;

the pressing shaft is fixedly arranged on the loading piece, and the driven rotating piece is rotatably arranged on the loading piece; and

one end of the rolling curtain is arranged on the driven rotating piece and is rolled on or rolled out of the driven rotating piece along with the rotation of the driven rotating piece;

wherein at least a part of the motor casing is arranged in the driven rotating part.

Optionally, if a grease layer is provided on the rotating ring and/or the friction fit, the grease layer has a kinematic viscosity of the base oil in the range of 180 to 230mm measured at 25 ℃ ² The using temperature of the grease layer is-50-250 ℃, and the rotating speed of the driven rotating piece is 0-60r/min.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view illustrating a structure in which a roll screen is wound on an electric device according to an embodiment of the present roll screen system.

Fig. 2 is a schematic view showing a structure in which a roll screen is drawn out from an electric device according to an embodiment of the present roll screen system.

Fig. 3 is a schematic view of a partially exploded structure of an electric device in an embodiment of the present roller shade system.

Fig. 4 is a schematic view of a fully exploded structure of an electric device in one embodiment of the present roller shade system.

Fig. 5 is a schematic view of a rotation angle limiting shaft as a part of a rotation angle limiting member in an electric device according to an embodiment of the present roller blind system.

Fig. 6 is a schematic structural view of a rotation angle limiting hole as another part of a rotation angle limiting member in an electric device according to an embodiment of the present roll screen system.

Fig. 7 is a partially sectioned schematic view of a motor housing and components therein of an electric device according to an embodiment of the present roller shutter system.

Fig. 8 is a front view of fig. 7.

Fig. 9 is a partially enlarged schematic view of a portion I in fig. 8.

Fig. 10A is a schematic view of a rotating ring without a rotating protrusion according to an embodiment of the present electric device.

Fig. 10B is a front view of fig. 10A.

Fig. 10C isbase:Sub>A schematic cross-sectional view of fig. 10B cut along the directionbase:Sub>A-base:Sub>A.

FIG. 10D is a schematic cross-sectional view of FIG. 10B taken along line B-B.

Fig. 11A is a schematic view of a rotating ring provided with a rotating protrusion according to an embodiment of the present electric device.

Fig. 11B is a schematic front view of fig. 11A.

FIG. 11C is a schematic cross-sectional view of FIG. 11B taken along line C-C.

FIG. 11D is a schematic cross-sectional view of FIG. 11B taken along line D-D.

Fig. 12A is a schematic view of a rotating ring provided with a rotating protrusion according to an embodiment of the present electric device.

Fig. 12B is a front view of fig. 12A.

FIG. 12C is a schematic cross-sectional view of FIG. 12B taken along direction E-E.

FIG. 12D is a schematic cross-sectional view of FIG. 12B taken along direction F-F.

The figures are for illustrative purposes only and are not intended to be drawn to scale. In the drawings, like reference numerals are used to indicate like elements. For purposes of clarity, not every component may be labeled in every drawing.

Detailed Description

The invention will be described below with reference to several examples. It is to be understood that these embodiments are described in order to enable others of ordinary skill in the art to better understand and implement the present invention, and do not represent or imply any limitations on the scope of the invention.

Before describing the embodiments of the present electric device, the related design concept for generating the present electric device will be described, which will be described in detail below.

Generally, an electric device includes a motor as a power unit for driving a driven rotation member to perform a rotational motion.

During the use of the electric device, it is sometimes required to control the motor to rotate reversely when the driven rotating member encounters external resistance. To achieve this, a switch may be provided which remains normally open when the driven rotating member encounters no resistance, and which is depressed to a closed position when the driven rotating member encounters resistance. To change the open/close state of the switch, the switch may be changed to a position close to the pressing member for pressing the switch, so as to change the switch from the normally open state to the closed state. The switch is normally disposed in the same housing as the motor and is not rotated by the rotation of the driven rotating member, but is in a stationary state. Only when the driven rotation member encounters an external resistance, in which case it may even occur that the rotation direction of the driven rotation member is opposite to the rotation direction of the output of the motor since the rotation speed of the driven rotation member is smaller than the rotation speed of the output of the motor, so that the output of the motor is subjected to a reverse torque from the driven rotation member, causing a positional change of the mounting case where the motor and the switch are mounted, thereby causing the switch to move in the direction of the pressing member for pressing the switch.

In use, because the driven rotating member is subjected to uncertain magnitude of external resistance, if the driven rotating member is subjected to sufficient external resistance, a reverse torque can be generated which is large enough to cause the position change of the mounting housing in which the motor and the switch are mounted. If the external resistance is not large enough, the reverse torque which is large enough to change the position of the mounting housing where the motor and the switch are mounted may not be generated, so that the rotation direction of the output of the motor is not changed after the driven rotating member is blocked, and the driven rotating member still continues to rotate along the original rotation direction, and the electric device obviously cannot achieve the function of reversing the output of the motor after the external resistance is met.

It is precisely because of the uncertainty of the magnitude of the external resistance to which the driven rotating member is subjected that can lead to possible failure of the electric device.

Such a failure phenomenon is of course undesirable and serious for the user of the above-mentioned electric device, which may result in loss of life, property, etc. of the user.

The present invention relates to an electric device, and more particularly to an electric device, which is capable of changing the direction of the output of the motor by changing the resistance of the driven rotating member when the external resistance is small.

The electric device can be applied to a plurality of scenes, such as a roller shutter system for opening and closing doors and windows or shielding doors and windows, and the like.

As shown in fig. 1 to 4, one embodiment of the present roll screen system includes a load member, a roll screen 100, and an electric device 200. The electric device 200 is arranged on a load member which can be arranged on a building (such as a door and a window), and the roller shutter 100 is wound on the electric device 200, and the electric device 200 is used for driving the roller shutter to be retracted.

The load-bearing member can be a frame-shaped structure or other structures, and can be specifically arranged according to the requirement.

The roller blind 100 may be made of flexible material, such as cloth, hemp, and plastic sheet, or may be made of hard metal or hard plastic, and the parts are connected by hinge.

The electric device 200 includes a driving motor 210, a motor housing 220, a push switch 230, a push shaft 240, a push member 250, a driven rotation member 260, and an internal resistance applying assembly 270.

The driving motor 210 has an output shaft 211 for connecting with the driven rotation member 260 to drive the driven rotation member 260 to rotate. In order to reduce the rotation speed of the output shaft 211 of the driving motor 210, a transmission may be provided between the output shaft 211 of the driving motor 210 and the driven rotation member 260. In addition, in order to facilitate the control of the separation and connection of the driving motor 210 and the driven rotation member 260, a clutch may be provided between the driving motor 210 and the driven rotation member 260.

The motor housing 220 has a hollow structure therein, and the shape of the motor housing 220 can be designed into various structures according to requirements, as shown in fig. 3, 4, 7 and 8, and the motor housing 220 is designed into a cylindrical structure. The cavity in the motor housing 220 is used for mounting the driving motor 210, and the output shaft 211 of the driving motor 210 extends out of one axial end of the cylindrical motor housing 220 to facilitate the engagement of the driving rotation member 260. Since the output shaft 211 of the driving motor 210 is rotatable, the driving motor 210 is fixed in the motor housing 220, that is, the position of the driving motor 210 in the motor housing 220 is relatively unchanged during operation of the driving motor, and the fixing manner may be various, such as a clamping structure (e.g., matching between a chuck and a slot), or a limiting structure (e.g., matching between a limiting head and a limiting slot). In addition to installing the driving motor 210, the circuit components required for controlling the driving motor 210 may also be installed in the motor housing for easy installation and maintenance.

The push switch 230, which is one of the components of the circuit device required for controlling the driving motor 210, has two states, i.e., an open state and a closed state. According to design requirements, when the driving motor 210 drives the driven rotation member 260 to operate normally, the push switch is required to be in an on state all the time, and when the rotating driven rotation member 260 meets external resistance, the push switch 230 is required to be in an off state, so that a command for requiring reverse rotation of the driving motor 210 is provided.

The pressing shaft 240, in the present roller blind system, has one end fixed to the load member and the other end abutting against the motor housing 220, and is engaged with the motor housing 220 to rotate around the pressing shaft 240 when the motor housing rotates. As an example of the pressing shaft 240, as shown in fig. 4, 5, and 6.

A pressing member 250, disposed on the pressing shaft 240, for example, on an end of the pressing shaft 240 close to the motor housing 220, for rotating on the motor housing 220, and when the pressing switch 230 in the motor housing 220 rotates toward the pressing member 250, the pressing member 250 collides with the pressing portion 231 of the reversed pressing switch 230, and then the normally open pressing switch is pressed by the pressing member to form a closed state. The structure and shape of the pressing piece can be set to different shapes and sizes as required, and the pressing function can be realized. Specifically, as shown in fig. 4, the bottom of the pressing member 250 is fixed to the outer end of the pressing shaft 240, and the head 251 of the pressing member 250 is transversely configured to be an arc, and is disposed along the rotation direction of the motor housing 220 during rotation, and the longitudinal direction thereof is substantially parallel to the axial direction of the pressing shaft 240 of the pressing switch 230, so that when the motor housing 220 rotates, one longitudinal side of the head of the pressing member 250 interacts with the pressing portion 231 of the pressing switch 230, so as to exert a pressing force on the pressing portion 231 of the pressing switch 230.

It should be noted that the position of the motor housing 220 and its internal components is not changed during normal operation of the electric device 200 or may be changed briefly during the start-up of the electric device 200 or during the blockage of the driven rotating member 260 described above or below, which is the same as the state in which the driven rotating member 260 is rotated during the operation of the electric device 200 until the operation of the electric device 200 is stopped, and the driven rotating member 260 is stopped accordingly.

In some cases, in order to limit the rotation range of the motor housing 220 when rotating about the pressing shaft 240, a rotation angle stopper may be provided between the motor housing 220 and the pressing shaft 240. As an embodiment of the rotation angle limiting member 280, as shown in fig. 5 and 6, the rotation angle limiting member 280 includes a rotation angle limiting seat 281, and a section of the pressing shaft 240 is configured to have a cross section that is not circular (as shown in fig. 5, it is a flat section 241), and the rotation angle limiting seat 281 is provided with an installation hole that is matched with the flat section 241, and the installation hole is provided with a rotation limiting area 242 when the rotation angle limiting seat 281 rotates relative to the flat section 241. The rotation limit area 242 limits the angle of rotation of the rotation angle limiting seat 281 in one direction and the angle of rotation in the opposite direction. So as to control the difference alpha of the two angles within 180 degrees. As shown in fig. 5, the rotation limiting region 242 here controls the difference between the two angles to be within 90 degrees. This makes the angle of rotation of the motor housing 220 as small as possible under the condition that the push switch 230 is pushed, so as to shorten the time from the start of rotation of the motor housing 220 to the push of the push switch 230, to shorten the trigger time, and to improve the sensitivity. Of course, the α value may be further smaller, such as 60 degrees, 45 degrees, or 30 degrees, as required, and is specifically set as required.

The rotation angle limiting member is provided so that, even when the driving motor 210 starts to drive the driven rotor 260 to rotate, the motor housing 220 is rotated by a reverse force applied to the driving motor 210 due to a speed difference between the output shaft 211 of the driving motor 210 and the driven rotor 260 in a stationary state, and the rotation at this time causes the pressing portion 231 of the push switch 230 to rotate in a direction away from the head portion 251 of the push switch 250, instead of rotating the pressing portion 231 of the push switch 230 in a direction toward the head portion 251 of the push switch 250. In order to minimize the influence of the rotation of the motor housing 220 on the normal operation of the driving motor 210, the rotation angle limiting member is also required, so that the motor housing 220 is at rest after rotating at most the above-mentioned angle α, so as to facilitate the normal output of the driving motor 210.

The driven rotation member 260 may be provided in different structures as required, and the driven rotation member 260 may be a single part or a combination of a plurality of parts.

In addition, the positional relationship between the motor housing 220 and the driven rotation member 260 may be provided in various ways, such as when the motor housing 220 is completely located inside the driven rotation member 260, when the motor housing 220 is partially located inside the driven rotation member 260, and when the motor housing 220 is located outside the driven rotation member 260, the positional relationship may be set as required.

As shown in fig. 3 and 4, in the present embodiment, the driven rotor 260 has a cylindrical structure as a whole, and both ends thereof are provided on the load carrier and are rotatable with respect to the load carrier. The driven rotation member 260 includes a cylindrical curtain tube 261, and both ends of the curtain tube 261 are respectively rotatably connected to a supporting head or a supporting groove having a circular cross section provided on the load-carrying member, that is, when the curtain tube 261 rotates, the end thereof rotates around the supporting head or rotates in the supporting groove.

The output shaft 211 of the driving motor 210 may be directly connected to the shade drum 261, or may be connected to the shade drum 261 through an intermediate transmission member 262. As an embodiment of the intermediate transmission member 262, as shown in fig. 1 to 4, the intermediate transmission member 262 is a cylinder structure, and is provided with a shaft hole 266 adapted to the output shaft of the driving motor 210, and is provided with a third circumferential limiting protrusion 267 at the outer side thereof, and the third circumferential limiting protrusion 267 is inserted into the first circumferential limiting groove 265 arranged at the inner side of the shade barrel 261, so that the output shaft of the driving motor 210 drives the shade barrel 261 to rotate through the intermediate transmission member 262.

In some cases, there may be a case that the size of the cross section of the supporting head does not match the size of the cross section of the curtain barrel 261, and the driven rotating member 260 further includes two transition connecting cylinders 263, the two transition connecting cylinders 263 are respectively disposed at both ends of the curtain barrel 261, one end of the transition connecting cylinder 263 is matched with one end of the curtain barrel 261, and the other end is matched with the supporting head or the supporting groove, so that the size and the shape of the cross section of the end of the transition connecting cylinder 263 matched with the curtain barrel 261 are matched with the size and the shape of the curtain barrel 261, and the size of the cross section of the other end of the transition connecting cylinder 263 matched with the supporting head or the supporting groove is matched with the size of the supporting head or the supporting groove. Since the transition connecting cylinder 263 needs to be driven by the curtain cylinder 261 to rotate together, two structures which keep the same speed and the same direction during rotation need to be arranged between the transition connecting cylinder 263 and the curtain cylinder 261, and therefore, a first circumferential limiting projection 264 which is positioned at the outer side of the transition connecting cylinder 263 and a corresponding first circumferential limiting groove 265 which is positioned at the inner side of the curtain cylinder 261 are arranged between the transition connecting cylinder 263 and the curtain cylinder 261, and other structures, such as a clamping structure, can be adopted to clamp the transition connecting cylinder 263 and the curtain cylinder 261 together. In addition, the above-mentioned function of the transition connecting cylinder 263 can also be achieved to extend the length of the curtain cylinder 261. The intermediate transmission member 262 may be directly connected to the curtain tube 261 or directly connected to the transition connection tube 263, and when the output shaft of the driving motor 210 rotates, the transition connection tube 263 and the curtain tube 261 synchronously rotate together through the intermediate transmission member 262.

An internal resistance applying component 270 connected to the driven rotation component 260, wherein when the driven rotation component 260 rotates, the internal resistance applying component 270 is also driven by the driven rotation component 260 to rotate, but when the driven rotation component 260 rotates, the internal resistance applying component 270 continuously applies a resistance force (i.e. a resistance force generated by the electric device 200 itself, referred to as internal resistance force) with a friction property to the driven rotation component 260 along a direction opposite to the rotation direction thereof. Thus, when the rotating driven rotation member 260 is subjected to the external resistance force, it is also subjected to the internal resistance force, and when the external resistance force alone is insufficient to cause the motor housing 220 to rotate reversely so that the push switch 230 is pushed by the push member 250, the reverse rotation of the motor housing 220 is achieved by the combination of the external resistance force and the internal resistance force.

As shown in fig. 4, 7, 8, 9, 10A-10D, 11A-11D, 12A-12D, as one example of the internal resistance applying assembly 270, it includes a rotating ring 271 and a friction fitting 272.

The rotating ring 271, which is of a ring structure, is detachably connected to the driven rotating member 260, and as shown in fig. 10A to 10D, the rotating ring 271 and the transition connecting cylinder 263 are inserted into each other through a second circumferential retaining protrusion 273 provided on the outer side of the rotating ring 271 and a second circumferential retaining groove 274 provided on the inner side of the transition connecting cylinder 263, and rotate in the same direction as the driven rotating member 260 rotates.

The friction fitting 272, which is always in a stationary state during the operation of the electric device 200, may be fixed to the pressing shaft 240, for example, so as to be coaxially disposed with the pressing shaft 240. Alternatively, friction fit 272 may be a single component or a combination of components. The rotating ring 271 is sleeved on the friction fitting 272, and when the rotating ring 271 rotates, at least a portion of the inner side surface of the rotating ring 271 rubs against at least a portion of the outer surface of the friction fitting 272 along the rotating direction of the rotating ring 271 (i.e. the first friction surface 2723 disposed on the outer surface of the friction fitting 272 along the rotating direction of the rotating ring 271), so as to generate a first internal resistance force (the first internal resistance force is all or at least a portion of the internal resistance force) opposite to the rotating direction of the rotating ring.

As an embodiment of friction fitting 272, as shown in fig. 4, 7, 8 and 9, it is a cylindrical structure with a circular cross section, but it may also be a circular truncated cone or conical structure, or any combination of the above structures, or only the part of friction fitting 272 that is engaged with rotating ring 271 is the above structure, and when rotating ring 271, the annular outer surface of friction fitting 272 and the annular inner side surface of rotating ring 271 are a pair of friction surfaces and interact with each other. Here, it is necessary to consider the inner diameter of the rotating ring 271 and the outer diameter of the friction fitting 272 at the section engaged with the rotating ring 271, and the difference between the inner diameter and the outer diameter cannot be too small, and if it is too small, the rotating ring 271 may be locked to the friction fitting 272 during rotation and cannot rotate, and if it is too large, the friction force generated between the rotating ring 271 and the friction fitting 272 during rotation is too small to play a role. In some cases, the ambient temperature is also taken into consideration, and if the temperature is too low, if the difference between the two is too small, the inner diameter of the rotating ring 271 becomes small and may be caught on the friction fitting 272 during its rotation. For this purpose, it is conceivable to set the inner radius of the rotary ring 271 to be 0.5 to 2.5mm greater than the outer radius of the friction fitting 272.

Since the rotating ring 271 is directly engaged with the friction fitting 272, when the electric device 200 is operated, the rotating ring 271 is also in a rotating state, that is, the rotating ring is always in friction with the engaging surface of the friction fitting 272, so that the number of times of use reaches a certain degree, the inner side surface of the rotating ring 271 and the engaging surface on the friction fitting 272 may be worn, and the engagement between the rotating ring 271 and the friction fitting 272 may be affected. Considering that this may happen, a grease layer may be applied to the inner side of the rotating ring 271 and/or the mating surface of the friction fitting 272, wherein the grease layer is provided with a material that takes into account a range of values related to "kinematic viscosity of base oil", otherwise the value is too small, which results in a relatively small first internal resistance, so that the motor housing 220 cannot be reversed when the driven rotating member 260 is subjected to an external resistance, so that the push switch 230 cannot be pushed. And the value of "kinematic base oil viscosity" ranges taking into account the rotational speed of the driven rotor 260.

In the roller blind system, it is considered that the rotation speed of the driven rotation member 260 is usually in the range of 0-60r/min, and the electric device emits a large amount of heat due to mechanical work during use to make the temperature in the body higher, and it is also considered that the roller blind system is also applied in a very low temperature environment. Base oil of the grease layer in the roller shutter systemThe kinematic viscosity ranges from 180 to 230mm measured at 25 DEG C ² And/s, the using temperature of the grease layer is-50-250 ℃, and the rotating speed of the driven rotating part is 0-60r/min. In addition, the base oil of the grease used in the grease layer can be selected according to the needs, such as silicone (silicone oil), the type of the thickening agent of the grease can be PTFE, and other thickening agents can be selected according to the needs, so that the requirements of the base oil kinematic viscosity range and the use temperature range of the grease layer can be met.

In some cases, the first internal resistance may also not rotate the motor housing 220 when the driven rotation member 260 receives the external resistance, so that the push switch 230 cannot be pushed. To this end, the internal resistance applying assembly further comprises a member capable of forming a second internal resistance, as shown in fig. 4, 7, 8, 9, 11A-11D, 12A-12D, which comprises at least one rotating protrusion 275 protruding from the inner side surface of the rotating ring 271 in the radial direction of the rotating ring 271 and arranged in the rotating direction of the rotating ring 271, wherein the rotating protrusion 275 rotates with the rotation of the rotating ring 271, and the friction fitting 272 is divided into two separate first 2721 and second 2722 friction fitting components, the rotating protrusion 275 is sandwiched between the first 2721 and second 2722 friction fitting components, and each of the two friction fitting components comprises a first 2723 and a second 2724 friction surface, the first 2723 frictionally fitting with the inner side surface of the rotating ring 271 to form the first internal resistance, and the second 2724 frictionally fitting with the side surface of the rotating protrusion 275 arranged in the radial direction of the rotating ring 271 to form the second internal resistance.

Since the second internal resistance is too large, which may cause the rotating ring 271 to still be in a stationary state when the driving motor 210 operates or cause the driven rotating member 260 to rotate at a slower speed, the present roller blind system may not work normally, and therefore, a spacing adjustment subassembly may be adopted to adjust the distance between the first frictional engagement sub-component 2721 and the second frictional engagement sub-component 2722, which may include a spacing adjustment bolt and a spacing adjustment nut disposed thereon as an example of the spacing adjustment subassembly, the spacing adjustment bolt is connected to the first frictional engagement sub-component 2721 and the second frictional engagement sub-component 2722, and the spacing adjustment nut is screwed to adjust the distance between the first frictional engagement sub-component 2721 and the second frictional engagement sub-component 2722, so as to adjust the second internal resistance to a proper magnitude. Thus, in the case where the driven rotation member 260 encounters resistance and the external resistance is small, so that the motor housing 220 cannot be rotated by the external resistance alone, the resultant force of the first internal resistance and the second internal resistance causes the motor housing 220 to rotate in the reverse direction, so that the push switch 230 is pushed to be turned from the open state to the closed state.

In some cases, in order to control the magnitude of the second internal resistance, it is necessary to control the length of the rotation protrusion 275 in the radial direction of the rotation ring 271, which is too short, does not generate a sufficient second internal resistance, and which is too long, exceeds the desired magnitude of the second internal resistance. The length can therefore be set in the range 2-5mm.

In some cases, in order to prevent the second internal resistance from being excessive, as shown in fig. 4, 7, 8, 9, 11A to 11D, and 12A to 12D, the rotating protrusion 275 is not provided in an annular structure along the rotating direction of the rotating ring 271, but is provided in a structure in which a plurality of arc-shaped rotating protrusions 275 are provided at intervals (i.e., gaps exist between adjacent rotating protrusions 275), and the plurality of arc-shaped rotating protrusions 275 are provided in an annular shape along the rotating direction of the rotating ring 271. Thus, not only is the required matching friction surface for generating the second internal resistance reduced, but also the plurality of arc-shaped rotating protrusions 275 with the same size can generate a second internal resistance with a plurality of uniform sections when matching with the first friction matching sub-component 2721 and the second friction matching sub-component 2722, so that the second internal resistance received by the rotating ring 271 during rotation is more uniform, and the rotating ring can rotate more stably, so that the rotation of the driven rotating component 260 can be correspondingly more stable, and the phenomena that the rotating speed is suddenly blocked and slowed down or even stopped and then suddenly rotates again during operation are reduced.

Considering from the perspective of facilitating the control of the second internal resistance, in some cases, as shown in fig. 7, 8, 9, 11A-11D, 12A-12D, the rotating protrusion 275 is bent at least once along the axial direction of the rotating ring to form a plurality of rotating bent segments 2751, and the second internal resistance is increased by gradually increasing the frictional contact surface of the first and second friction-

fit components

2721 and 2722 with the rotating protrusion 275 during the gradual approach of the first and second friction-

fit components

2721 and 2722 to the rotating protrusion 275 through the adjustment of the interval adjustment subassembly. That is, during the adjustment process using the spacing adjustment subassembly, the first and second friction-

fit components

2721 and 2722 may only contact at least a portion of one of the rotating bent segments 2751 on the rotating protrusion 275, and then gradually, the first and second friction-

fit components

2721 and 2722 may contact all of the one of the rotating bent segments 2751 on the rotating protrusion 275, and then, the first and second friction-

fit components

2721 and 2722 may further contact a portion or all of the other rotating bent segment 2751 on the rotating protrusion 275, so that finally, the first and second friction-

fit components

2721 and 2722 may contact all of the rotating bent segments 2751 on the rotating protrusion 275. The contact area required can be set by the interval adjusting sub-assembly according to specific requirements during installation, and basically does not need to be changed during installation.

In order to increase the contact surface of the rotary protrusion 275 with the first and second friction-

fit components

2721 and 2722 without changing the vertical height of the rotary protrusion 275 in the radial direction of the rotary ring 271. In some cases, as shown in fig. 11A, 11C, 11D, 12A, 12C, and 12D, the rotating protrusion 275 is obliquely disposed on the inner side of the rotating ring 271 (i.e., is inclined in the axial direction of the rotating ring 271), and the oblique disposition also facilitates the gradual control of the size of the contact surface of the rotating protrusion 275 with the first and second friction-

fit components

2721 and 2722 by a spacing adjustment subassembly.

In some cases, the inclined arrangement of the rotating protrusion 275 may be inclined only in one of the forward or backward axial direction of the rotating ring 271, and this arrangement may cause the rotating ring 271 to shift in the axial direction during rotation when the electric device 200 is operated, which may result in unstable rotation of the rotating ring 271. As an example of the arrangement of the rotating protrusions 275 in the rotating ring 271, as shown in fig. 12A to 12D, every two adjacent rotating protrusions 275 on the inner surface of the rotating ring 271 are arranged in a staggered manner with respect to the inclination direction of the inner surface of the rotating ring 271 being opposite to each other (i.e., one rotating protrusion 275 is inclined in the forward direction in the axial direction of the rotating ring 271, and the other adjacent rotating protrusion 275 is inclined in the backward direction in the axial direction of the rotating ring 271).

Since the rotation protrusion 275 is also rotated during operation, abrasion may occur over time, which may affect the use effect. For this reason, in some cases, the side surfaces of the rotary protrusion 275 located on the front and rear sides in the axial direction of the rotary ring 271 and the side surfaces of the first frictional engagement piece 2721 and the second frictional engagement piece 2722 engaged with the rotary protrusion 275 may be coated with the above-mentioned grease layer, so that the first frictional engagement piece 2721, the second frictional engagement piece 2722, and the rotary protrusion 275 may be protected in the case where a sufficiently large second internal resistance is obtained.

The rotating protrusion 275 and the rotating ring 271 may be made of engineering plastics from the viewpoint of mechanical strength and manufacturing convenience, and thus, an injection molding process may be used to form the rotating protrusion 275 and the rotating ring 271 as an integrated structure.

In the claims, the word "comprising" does not exclude other elements or steps; the word "a" or "an" does not exclude a plurality. Use of ordinal terms such as "first," "second," etc., in the claims to modify a claim element does not by itself connote any priority, order, or temporal order of execution of one claim element over another, but are used merely for the purpose of distinguishing one claim element from another. Although certain features may be described in different dependent claims, this does not imply that these features cannot be used in combination. Various aspects of the present invention may be used alone, in combination, or in a variety of arrangements not specifically discussed in the embodiments described in the foregoing and is therefore not limited in its application to the details and arrangement of components set forth in the foregoing description or illustrated in the drawings. For example, aspects described in one embodiment may be combined in any manner with aspects described in other embodiments. The steps, functions or features recited in a plurality of modules or units may be performed or satisfied by one module or one unit. The steps of the methods disclosed herein are not limited to being performed in any particular order, as some or all of the steps may be performed in other orders. Any reference signs in the claims shall not be construed as limiting the scope of the claims.

While the invention has been described by way of illustration and example, such description and illustration are to be considered illustrative or exemplary and not restrictive. Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. An electrically powered device, characterized in that the electrically powered device comprises:

a drive motor;

the driven rotating part is connected to the output shaft of the driving motor, is separated from the motor shell, and rotates in the same speed and direction with the output shaft after being driven by the output shaft of the driving motor;

wherein the internal resistance applying assembly comprises:

2. The motorized apparatus of claim 1, wherein the internal resistance applying assembly further comprises:

at least one rotating convex part which is arranged on the inner side surface of the rotating ring in a convex way along the radial direction of the rotating ring and is arranged along the rotating direction of the rotating ring, and when the rotating ring rotates, the rotating convex part rotates along with the rotating ring in the same direction;

the friction fitting comprises:

a first friction fit sub;

3. The motorized apparatus of claim 2, wherein:

the number of the rotary convex parts is a plurality of, and the rotary convex parts are arranged at intervals in sequence along the rotating direction of the rotary ring and form an annular structure.

4. The motorized apparatus of any one of claims 2 to 3, wherein:

the rotating convex part is bent at least once along the axial direction of the rotating ring to form a plurality of rotating bent sections, and the first friction fit sub-component and the second friction fit sub-component are respectively contacted with at least one rotating bent section on the rotating convex part through the interval adjusting sub-component.

5. The motorized apparatus of any one of claims 2 to 3, wherein:

each rotating convex part is obliquely arranged on the inner side surface of the rotating ring.

6. The motorized apparatus of claim 5, wherein:

every two adjacent rotating convex parts are opposite to each other in the inclination direction relative to the inner side surface of the rotating ring and are arranged in a staggered manner.

7. The motorized apparatus of any one of claims 2 to 3, wherein:

the length range of the rotary convex part along the radial direction of the rotary ring is 2-5mm.

8. The motorized apparatus of any one of claims 2 to 3, wherein:

the rotating ring, the rotating convex part and the friction fitting piece are all made of engineering plastics;

the rotating ring and the rotating convex part are connected into a whole.

9. The motorized apparatus of any one of claims 1 to 3, wherein:

the rotating ring and/or the friction fitting part are/is provided with a grease layer, the kinematic viscosity range of the base oil of the grease layer depends on the rotating speed of the driven rotating part, and the grease layer is used for increasing the first internal resistance applied to the rotating ring.

10. The motorized apparatus of any one of claims 1 to 3, further comprising:

the rotation angle limiting part is arranged between the motor shell and the pressing shaft so as to limit the rotation angle range of the motor shell rotating around the pressing shaft when the motor shell rotates.

11. The motorized apparatus of any one of claims 1 to 3, wherein:

the inner radius of the rotating ring is 0.5-2.5mm larger than the outer radius of the friction fitting.

12. A roller shade system, characterized in that the roller shade system comprises:

an electrically powered device as claimed in any one of claims 1 to 11;

wherein at least a portion of the motor housing is disposed within the driven rotating member.

13. The roller shade system of claim 12, wherein:

if a grease layer is provided on the rotating ring and/or the friction fitting, the kinematic viscosity of the base oil of the grease layer is in the range of 180 to 230mm measured at 25 DEG C ² And/s, the using temperature of the grease layer is-50-250 ℃, and the rotating speed of the driven rotating part is 0-60r/min.