Knob type motor protector

Abstract

The utility model discloses a knob type motor protector, including the contact mechanism and operating mechanism of setting in the casing, operating mechanism includes setting the mechanism support in the casing, and the mechanism wheel of rotation setting on the mechanism support, and the operating knob of rotation setting in the top of casing, through the multiple drive grooves of interval setting on the arc side wall of mechanism wheel, operating knob bottom is equipped with the multiple drive block of rotation connection in multiple drive grooves, and the cooperation of drive block and drive groove between operating knob and mechanism wheel, and transmission path is short, and response is fast, and the knob action can be fast accurate transmission to mechanism wheel, and the structural innovation of this operating mechanism through single knob and mechanism wheel realizes the integration of function and the simplification of transmission chain, reduces the installation spare part, and the assembly is also more convenient, reduces assembly difficulty and material cost, also lets internal layout be more compact, is favorable to product miniaturization, light weight, reduces production cost.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a knob-type motor protector. Background Technology

[0002] Motor protectors are used for infrequent starting and overload protection, as well as short-circuit protection of motors. In addition to the basic switching function for controlling the start / stop of the motor, existing motor protectors also have short-circuit protection and overload protection functions.

[0003] Existing motor protectors use an operating mechanism to drive the moving and stationary contacts in the contact mechanism to close or open, thereby starting or stopping the motor. The existing operating mechanism mainly includes a start button and a stop button located on the top of the housing, and a cam structure rotatably mounted inside the housing. The cam structure is connected to the contact mechanism via a linkage assembly. The cam structure has protrusions that respectively cooperate with the start and stop buttons. Pressing the start or stop button drives the rotating wheel to perform the closing or opening movement, thus closing or opening the moving and stationary contacts. As can be seen from the above structure, this type of motor protector requires two buttons (start / stop) to cooperate with the cam structure to achieve the opening and closing actions respectively. The overall structure is complex, with many components, making installation cumbersome and increasing costs. Utility Model Content

[0004] Therefore, the purpose of this utility model is to overcome the problems existing in the prior art, thereby providing a knob-type motor protector that simplifies the mechanism transmission chain, reduces assembly difficulty and material costs, has a simple and compact structure, and is conducive to product miniaturization and weight reduction.

[0005] To achieve the above objectives, this utility model provides a rotary motor protector, including a contact mechanism and an operating mechanism disposed in the housing. The operating mechanism is used to drive the moving contact in the contact mechanism to contact or separate from the stationary contact. The operating mechanism includes:

[0006] The mechanism support is housed within the casing;

[0007] The mechanism wheel is rotatably mounted on the mechanism support and has a closed position and a closed position. Multiple drive grooves are spaced apart on the arc-shaped sidewall of the mechanism wheel. The mechanism wheel is connected to the contact mechanism through a transmission assembly.

[0008] An operating knob is rotatably mounted on the top of the housing. At the bottom of the operating knob are multiple driving blocks rotatably connected in multiple driving slots. The multiple driving blocks are distributed circumferentially around the axis of the operating knob. When the operating knob is rotated in the forward or reverse direction, it pushes against the multiple driving slots through the multiple driving blocks to drive the mechanism wheel to move to the closed or open position.

[0009] As a preferred embodiment, the rotation axis of the operating knob intersects perpendicularly with the rotation axis of the mechanism wheel, and the multiple drive slots are respectively located on the movement paths of the multiple drive blocks.

[0010] As a preferred embodiment, the operating knob includes a chassis disposed at its bottom, and the drive block is a push rod structure that extends axially along the operating knob and is disposed on the chassis.

[0011] As a preferred embodiment, the push rod structure is a cylindrical rod or a conical rod.

[0012] As a preferred embodiment, a guide block is provided between multiple drive slots, and guide ramps connecting two adjacent drive slots are provided on both sides of the guide block.

[0013] As a preferred embodiment, a limiting structure is provided between the operating knob and the housing to limit the rotation stroke of the operating knob. The limiting structure includes a first stop block disposed on the inner bottom surface of the top of the housing, and two second stops block disposed on the bottom side of the operating knob. The first stop block is disposed on the movement path of the two second stops block.

[0014] As a preferred embodiment, the operating knob includes a knob shaft, a knob handle, and a base that are coaxially linked. The base is integrally connected to the lower end of the knob shaft. A slot hole is provided in the middle of the knob shaft, and the knob handle is provided with a corresponding snap fastener that engages with the slot hole.

[0015] As a preferred embodiment, the transmission assembly includes a lever, a jump fastener, a locking fastener, and a transmission rod connecting the jump fastener and the mechanism wheel, all rotatably mounted on the mechanism support. The mechanism support is provided with a torsion spring connecting the lever. One end of the jump fastener abuts against the release fastener to form a locking engagement, and the other end is connected to the lever.

[0016] As a preferred embodiment, the mechanism wheel has a V-shaped protrusion on the side away from the drive groove. The two ends of the transmission rod are respectively connected to the protrusion and the middle of the jump fastener by two pins. The mechanism support includes two opposing mechanism plates, and there is a space between the two mechanism plates suitable for accommodating the jump fastener, the locking fastener, and the lever. The mechanism support is provided with two arc-shaped guide holes for connecting the two pins.

[0017] As a preferred embodiment, the contact mechanism includes a contact support that is reciprocally disposed within the housing, a movable contact disposed on the contact support, a stationary contact disposed within the housing opposite to the movable contact, and a rocker arm that is oscillatingly disposed between the contact support and the lever member. A return spring is provided between the movable contact and the housing.

[0018] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0019] 1. In the rotary motor protector provided by the utility model, the operating knob drives the drive block at its bottom to rotate and connect to the drive groove of the mechanism wheel. The operating knob rotates in the forward or reverse direction, and multiple drive blocks push against multiple drive grooves to achieve power transmission. The transmission path is direct and clear, directly driving the mechanism wheel to the closing or opening position, thereby realizing the opening and closing operation of the motor protector. This operating mechanism uses a knob drive method to replace the traditional two buttons and complex protruding rod structure. The operating knob and the mechanism wheel are connected by the cooperation of the drive block and the drive groove. The transmission path is short and the response is fast. The knob action can be quickly and accurately transmitted to the mechanism wheel, improving the timeliness and reliability of the opening and closing operation of the mechanism, reducing power loss and transmission delay. The motor protector designed with this technical solution achieves functional integration and simplification of the transmission chain through the structural innovation of a single knob and mechanism wheel. It reduces the number of installation parts, makes assembly more convenient, reduces assembly difficulty and material costs, and makes the internal layout more compact, which is conducive to product miniaturization and weight reduction, and reduces production costs.

[0020] 2. In the rotary motor protector provided by the utility model, the rotation axis of the operating knob intersects perpendicularly with the rotation axis of the mechanism wheel. This allows the operating knob to be positioned on the top of the housing, while the mechanism wheel is arranged inside the housing to achieve transmission coordination with the rotation of the operating knob. This effectively utilizes the vertical dimension of the space. Since the two axes intersect perpendicularly, the horizontal rotational motion of the operating knob is directly converted into a vertical thrust on the drive groove of the mechanism wheel through the axial push rod. The contact point between the push rod and the drive groove is in the optimal mechanical transmission path, with a clear force direction and a relatively stable contact area. This allows for more effective torque transmission and reduces slippage or jamming during transmission. This vertical layout allows the entire operating mechanism to be arranged more rationally within the limited housing space, making the internal structure more compact. This is beneficial for the miniaturization design of the motor protector and improves the overall structural stability and reliability.

[0021] 3. In the rotary motor protector provided by the utility model, guide blocks are provided between multiple drive slots. When the operating knob is rotated in the forward and reverse directions, driving the drive block into the corresponding drive slot, the guide slope of the guide block can play a role in smooth transition and guiding reversal of the drive block. Through the cooperation of the drive block, guide block and drive slot, the mechanism wheel can be accurately stopped at the closing or opening position during the rotation of the mechanism wheel driven by the drive block. When the drive block moves along the guide slope to a specific position of the drive slot, the mechanism wheel can be stably placed at the target position with the help of the slope, ensuring reliable opening and closing of the contact mechanism and improving the accuracy of the opening and closing action of the motor protector. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the knob-type motor protector of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the knob-type motor protector of this utility model;

[0025] Figure 3 This is a schematic diagram of the internal structure of the knob-type motor protector of this utility model;

[0026] Figure 4 This is a schematic diagram of the operating mechanism of this utility model;

[0027] Figure 5 This is a schematic diagram of the mechanism wheel of this utility model;

[0028] Figure 6 This is a schematic diagram of the operating knob of this utility model.

[0029] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Mechanism support; 21. Arc-shaped guide hole; 3. Operating knob; 31. Drive block; 32. Knob handle; 33. Knob shaft; 34. Chassis; 35. Snap-fit ​​buckle; 36. Snap-fit ​​hole; 37. Second stop block; 4. Mechanism wheel; 41. Drive groove; 42. Guide block; 43. Protrusion; 5. Jump fastener; 6. Lever; 61. Torsion spring; 7. Transmission rod; 71. Pin; 8. Locking buckle; 91. Moving contact; 92. Stationary contact; 93. Contact support; 94. Rocker arm. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Example

[0034] The following is a detailed description of this embodiment with reference to the accompanying drawings:

[0035] This embodiment provides, as follows: Figure 1-6 The rotary motor protector shown includes a contact mechanism and an operating mechanism disposed in a housing 1. The operating mechanism is used to drive the moving contact 91 in the contact 91 mechanism to contact or separate from the stationary contact 92. The operating mechanism includes a mechanism support 2 disposed in the housing 1, a mechanism wheel 4 rotatably disposed on the mechanism support 2, and an operating knob 3 rotatably disposed on the top of the housing 1. The mechanism wheel has multiple drive grooves 41 spaced apart on its arc-shaped sidewall. The mechanism wheel 4 is connected to the contact mechanism through a transmission assembly, so that the mechanism wheel 4 rotates during operation. The control knob 3 has a closed position where the moving contact 91 contacts the stationary contact 92, and an open position where the moving contact 91 separates from the stationary contact 92. The bottom of the control knob 3 is provided with multiple driving blocks 31 rotatably connected in multiple driving slots 41. The multiple driving blocks 31 are distributed circumferentially around the axis of the control knob 3. When the control knob 3 rotates in the forward or reverse direction, the multiple driving blocks 31 push against the multiple driving slots 41 to drive the mechanism wheel 4 to move to the closed or open position, thereby realizing the opening and closing action of the control mechanism for the motor protector.

[0036] In the above embodiments, the operating knob 3 transmits power by rotating in the forward or reverse direction, using multiple drive blocks 31 to push against multiple drive slots 41. The transmission path is direct and clear, directly driving the mechanism wheel 4 to the closing or opening position, thereby realizing the opening and closing operation of the motor protector. This operating mechanism uses a knob-driven method to replace the traditional two-button and complex protruding rod structure. The operating knob 3 and the mechanism wheel 4 are connected by the cooperation of the drive blocks 31 and the drive slots 41. The transmission path is short and the response is fast. The knob action can be quickly and accurately transmitted to the mechanism wheel 4, improving the timeliness and reliability of the opening and closing operation of the mechanism, reducing power loss and transmission delay. The motor protector designed with this technical solution achieves functional integration and simplification of the transmission chain through the structural innovation of a single knob and mechanism wheel, reducing installation parts, making assembly more convenient, reducing assembly difficulty and material costs, and making the internal layout more compact, which is conducive to product miniaturization and weight reduction, and reducing production costs.

[0037] Further optimized settings, combined with Figure 2-4 As shown, the rotation axis of the operating knob 3 intersects perpendicularly with the rotation axis of the mechanism wheel 4. Multiple drive slots 41 are located on the movement paths of multiple drive blocks 31. The operating knob 3 includes a base 34 at its bottom. The drive blocks 31 are push rod structures extending axially along the operating knob 3 and mounted on the base 34. Multiple push rod structures are connected as one unit via the base 34. The base 34 bears the knob torque and has high overall torsional rigidity. This push rod structure is preferably a cylindrical or conical rod. The advantage of this design is that, since the rotation axis of the operating knob 3 intersects perpendicularly with the rotation axis of the mechanism wheel 4, the operating knob 3 can be positioned on the top of the housing 1, while the mechanism... The mechanism wheel 4 is arranged inside the housing 1 to achieve transmission cooperation with the operation rotation, effectively utilizing the vertical dimension of space. It reliably converts the horizontal rotation of the operation knob 3 directly into a vertical thrust on the drive groove 41 on the mechanism wheel 4 through the axial push rod. The contact point between the push rod and the drive groove 41 is in the optimal mechanical transmission path, with a clear force direction and a relatively stable contact area, which can more effectively transmit torque and reduce slippage or jamming during transmission. This vertical layout allows the entire operating mechanism to be laid out more rationally within the limited space of the housing 1, making the internal structure more compact, which is conducive to the miniaturization design of the motor protector and improves the stability and reliability of the overall structure.

[0038] like Figure 3-6As shown, by designing multiple drive slots 41 and multiple drive blocks 31, the required travel distance for the mechanism wheel 4 to move to the closed or open position can be met, ensuring the accuracy and reliability of the operating mechanism in performing the opening and closing operations. Among them, guide blocks 42 are provided between the multiple drive slots 41, and guide slopes connecting two adjacent drive slots 41 are provided on both sides of the guide blocks 42. With this structure, when the operating knob 3 is rotated in the forward and reverse directions, driving the drive block 31 into the corresponding drive slot 41, the guide slope of the guide block 42 can play a role in smooth transition and guiding the reversal of the drive block 31. Through the cooperation of the drive block 31, guide block 42 and drive slot 41, the mechanism wheel 4 can be accurately stopped at the closed or open position during the rotation of the mechanism wheel 4 driven by the drive block 31. When the drive block 31 moves along the guide slope to a specific position of the drive slot 41, the mechanism wheel can be stably positioned at the target position with the help of the slope, ensuring the reliable opening and closing of the contact mechanism and improving the accuracy of the opening and closing operation of the motor protector.

[0039] To prevent excessive rotation of the operating knob 3 during opening and closing operations, a limiting structure is provided between the operating knob 3 and the housing 1 to restrict the rotational stroke of the operating knob 3. This limiting structure includes a first stop block located on the inner bottom surface of the top of the housing 1, and two second stop blocks 37 correspondingly located on the bottom side of the operating knob. Specifically, the two second stop blocks are located on the side of the chassis, with the first stop block positioned along the movement path of the two second stop blocks 37. This limiting structure design, through the cooperation of the first and second stop blocks 37, restricts the rotational stroke of the operating knob 3, preventing excessive rotation that could cause the mechanism wheel 4 to exceed its normal operating range. This prevents the mechanism wheel 4 from colliding and interfering with other components, protecting internal components such as the contact mechanism and transmission assembly from damage, and extending the service life of the motor protector. Furthermore, the limiting structure provides operators with clear operating limits, allowing them to know exactly how much rotation of the operating knob is needed to complete the closing or opening action, improving the accuracy and consistency of operation, and ensuring that the motor protector can reliably execute opening and closing commands.

[0040] In a preferred embodiment, the operating knob 3 includes a knob shaft 33, a knob handle 32, and a base 34, which are coaxially linked. The base 34 is integrally connected to the lower end of the knob shaft 33. A slot hole 36 is provided in the middle of the knob shaft, and the knob handle 32 is provided with a corresponding snap fastener 35 that snaps into the slot hole 36. The relative positions of the knob handle 32 and the knob shaft 33 can be precisely constrained by the engagement of the snap fastener 35 with the slot hole. This structural design mainly divides the operating knob 3 into two parts: the knob shaft 33 and the knob handle 32. They can be processed independently and then quickly assembled by the engagement of the snap fastener 35 with the slot hole. Compared with an integral knob, it does not require complex molds for one-time molding, reducing the difficulty of mold design and manufacturing costs. Moreover, the dimensional accuracy of the parts is easier to control during production, which can improve production efficiency and facilitate the replacement of damaged parts during later maintenance.

[0041] In this embodiment, combined with Figure 3-6 As shown, the transmission assembly includes a lever 6, a jump fastener 5, a locking fastener 8, and a transmission rod 7 connecting the jump fastener 5 and the mechanism wheel 4, all rotatably mounted on the mechanism support 2. A torsion spring 61 is provided on the mechanism support 2 to connect the lever. One end of the jump fastener 5 abuts against a release element to form a locking engagement, and its other end is connected to the lever 6. More preferably, the mechanism wheel 4 has a V-shaped protrusion 43 on the side away from the drive groove 41. The two ends of the transmission rod 7 are respectively connected to the protrusion 43 and the jump fastener 5 via two pins 71. In the middle, the mechanism support 2 includes two opposing mechanism plates, and there is a space between the two mechanism plates suitable for accommodating the jump fastener 5, the locking fastener 8, and the lever 6. The mechanism support 2 is provided with two arc-shaped guide holes 21 for connecting the two pins 71. The two arc-shaped guide holes 21 guide the movement of the two pins 71, thereby limiting the trajectory of the jump fastener 5 reciprocating, so as to realize the coordinated transmission of motion and force between the mechanism wheel, transmission rod, jump fastener and lever, and to realize the opening and closing action of the operating mechanism.

[0042] Further optimized settings, such as Figure 2-3As shown, the contact mechanism includes a contact support 93 reciprocatingly disposed within the housing 1, a movable contact 91 disposed on the contact support 93, a stationary contact 92 disposed within the housing 1 opposite to the movable contact 91, and a rocker arm 94 oscillatingly disposed between the contact support 93 and the lever 6. The lever 6 applies a downward force to the contact support 93 by pressing against the rocker arm 94. A return spring is disposed between the movable contact 91 and the housing 1. The return spring applies an elastic force to the contact support 93 to move the movable contact 91 closer to the stationary contact 92. The following describes the opening and closing operation of the motor protector: During the closing operation, the operating knob 3 rotates forward, driving the mechanism wheel 4 to the closing position. Through the transmission between the protrusion 43 and the transmission rod 7, the trip fastener 5 is driven to close, thereby driving the lever 6 to continuously press down on the rocker arm 94 during the closing rotation. This pushes the contact support 93 downward to separate the moving and stationary contacts, thus realizing the opening operation of the motor protector. During the opening operation, the operating knob 3 is rotated in the opposite direction. Through the transmission between the protrusion 43 and the transmission rod 7, the trip fastener 5 is driven to open, thereby driving the lever 6 to gradually release the rocker arm 94 during the opening rotation. The contact support 93 returns to its original position under the action of the return spring, causing the moving contact 91 to contact the stationary contact 92, thus realizing the closing operation of the motor protector. Additionally, when the motor protector trips due to a short circuit or overload, it immediately causes the locking element 8 and the tripping element 5 to disengage, resulting in an imbalance between the mechanism wheel, locking element, and lever element. At this point, the torsion spring 61 drives the lever element 6 to rotate, which in turn drives the mechanism wheel 4 to move rapidly to the tripping position, thus achieving the product's tripping action. In this text, forward rotation and reverse rotation refer to two rotations of a component in opposite directions, not representing its actual rotation direction.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A rotary motor protector, comprising a contact mechanism and an operating mechanism disposed in a housing (1), characterized in that, The operating mechanism includes: The mechanism support (2) is installed inside the housing (1); The mechanism wheel (4) is rotatably mounted on the mechanism support (2) and has a closed position and a closed position. Multiple drive grooves (41) are spaced apart on the arc sidewall of the mechanism wheel. The mechanism wheel (4) is connected to the contact mechanism through a transmission assembly. An operating knob (3) is rotatably mounted on the top of the housing (1). The bottom of the operating knob (3) is provided with multiple driving blocks (31) rotatably connected in multiple driving slots (41). The multiple driving blocks (31) are distributed circumferentially around the axis of the operating knob (3). When the operating knob (3) rotates in the forward or reverse direction, it pushes against the multiple driving slots (41) through the multiple driving blocks (31) to drive the mechanism wheel (4) to move to the closed position or the open position.

2. The rotary motor protector according to claim 1, characterized in that: The rotation axis of the operation knob (3) is perpendicular to the rotation axis of the mechanism wheel (4), and the multiple drive slots (41) are located on the movement paths of the multiple drive blocks (31).

3. The rotary motor protector according to claim 2, characterized in that: The operating knob (3) includes a chassis (34) located at its bottom, and the drive block (31) is a push rod structure that extends along the axial direction of the operating knob (3) and is located on the chassis (34).

4. The rotary motor protector according to claim 3, characterized in that: The push rod structure is a cylindrical rod or a conical rod.

5. The rotary motor protector according to claim 1, characterized in that: A guide block (42) is provided between multiple drive slots (41), and guide slopes connecting two adjacent drive slots (41) are provided on both sides of the guide block (42).

6. The rotary motor protector according to claim 1, characterized in that: A limiting structure is provided between the operating knob (3) and the housing (1) to limit the rotation stroke of the operating knob (3). The limiting structure includes a first stop block provided on the inner bottom surface of the top of the housing (1) and two second stops blocks (37) correspondingly provided on the bottom side of the operating knob. The first stop block is located on the movement path of the two second stops blocks (37).

7. The rotary motor protector according to claim 6, characterized in that: The operating knob (3) includes a knob shaft (33), a knob handle (32), and a base (34) that are coaxially linked. The base (34) is integrally connected to the lower end of the knob shaft (33). A slot hole (36) is provided in the middle of the knob shaft. The knob handle (32) is provided with a corresponding snap fastener (35) that is snapped into the slot hole.

8. The rotary motor protector according to any one of claims 1-7, characterized in that: The transmission assembly includes a lever (6), a jump buckle (5), a locking buckle (8) rotatably mounted on the mechanism bracket (2), and a transmission rod (7) connecting the jump buckle (5) and the mechanism wheel (4). The mechanism bracket (2) is provided with a torsion spring (61) connecting the lever. One end of the jump buckle (5) abuts against the release buckle to form a locking engagement, and the other end is connected to the lever (6).

9. The rotary motor protector according to claim 8, characterized in that: The mechanism wheel (4) has a V-shaped protrusion (43) on the side away from the drive groove (41). The two ends of the transmission rod (7) are connected to the protrusion (43) and the middle of the jump fastener (5) respectively by two pins (71). The mechanism bracket (2) is provided with two arc-shaped guide holes (21) for connecting the two pins (71).

10. The rotary motor protector according to claim 1, characterized in that: The contact mechanism includes a contact support (93) that is reciprocally disposed within the housing (1), a movable contact (91) disposed on the contact support (93), a stationary contact (92) disposed within the housing (1) opposite to the movable contact (91), and a rocker arm (94) that is oscillatingly disposed between the contact support (93) and the lever (6). A return spring is provided between the movable contact (91) and the housing (1).

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