Built-in motor overheating automatic power-off protection device
By designing a built-in automatic power-off protection device for motor overheating, the problem of easy damage to the input terminals of thermal relays is solved by using a rotating connection and locking mechanism. This achieves stable terminal connection and rapid state switching, improving the durability and ease of operation of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI XIANGXINJIA TECHNOLOGY CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-23
AI Technical Summary
The input terminals of existing thermal relays are protruding and narrow, making them susceptible to damage from impacts and scratches during installation, handling, and maintenance, and they lack sufficient strength to resist deformation.
An integrated motor overheat automatic power-off protection device was designed, which adopts a structure of multiple protrusions and input terminals, combined with a rotating connection and locking mechanism, to ensure stable connection of the terminals in use and storage, and reduce the risk of external collision.
It achieves stable conductive connection and rapid state switching of terminals, avoids terminal bending damage, and improves the durability and ease of operation of the device.
Smart Images
Figure CN224400323U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical protection equipment technology, and in particular to a built-in automatic power-off protection device for motor overheating. Background Technology
[0002] An integrated motor is a type of motor that embeds its core components, stator and rotor, directly into the main structure of the device. Without a separate casing, it eliminates the need for additional transmission devices, saving space and improving transmission efficiency. It is suitable for applications like electric vehicles and robots where compactness and efficiency are crucial. When the motor is overloaded, the current increases, leading to increased heat. A thermal relay then triggers a power-off action, cutting off the motor's power supply and preventing burnout due to continuous overload and overheating, thus providing overload and overheat protection. However, in existing technologies, the protruding input terminals of these thermal relays, being narrow and protruding from the relay body, are highly susceptible to collisions and scratches with surrounding objects during installation, handling, and maintenance. External forces act directly on the protruding structure, and the narrow shape lacks sufficient strength to resist deformation, ultimately leading to bending damage. Utility Model Content
[0003] The purpose of this invention is to address the problem that some thermal relays have protruding and narrow input terminals that are easily damaged by collisions and scratches during installation, and are prone to bending due to insufficient strength. This invention proposes a built-in automatic power-off protection device for motor overheating.
[0004] The technical solution of this utility model is as follows: a built-in motor overheat automatic power-off protection device, including a thermal relay, the thermal relay having multiple protrusions, each protrusion having a corresponding first input terminal inside, and further including: a second input terminal rotatably connected to the end of the first input terminal, each second input terminal having a connecting sleeve slidably fitted on it, and a connecting plate in the middle of the second input terminal for fixing multiple ends to the outer wall of the corresponding connecting sleeve; a first locking mechanism, disposed on the outer wall of the thermal relay, and a second locking mechanism being provided on one of the protrusions and the connecting sleeve.
[0005] Optionally, the first locking mechanism includes a card holder fixedly connected to the outer wall of the thermal relay, and the card holder has a plurality of locking slots for locking the end of the second input terminal.
[0006] Optionally, the second locking mechanism includes a support sleeve fixedly connected to one end of a connecting sleeve, the support sleeve being slidably sleeved with a second input terminal, and a retaining sleeve slidably sleeved with the second input terminal being fixedly connected to the end of the support sleeve away from the connecting sleeve. A locking sleeve block is movably connected to the support sleeve, and an inner ring retaining block that is held in place by the retaining sleeve is fixedly connected to the inner wall of the end of the locking sleeve block near the connecting sleeve. A spiral insert sleeve that is spirally sleeved with the locking sleeve block is fixedly connected to one of the protrusions.
[0007] Optionally, a rotating block is fixedly connected to one end of the first input terminal near the second input terminal, and a rotating groove is provided at one end of the second input terminal near the first input terminal for the rotating block to be inserted into. A rotating shaft that movably passes through the rotating block is also provided at one end of the second input terminal near the rotating groove.
[0008] Optionally, a pair of slots are provided at one end of the second input terminal near the rotating groove, and both ends of the rotating shaft are fixedly connected with a block that is inserted into the slot.
[0009] Optionally, the outer wall of the locking sleeve is provided with a plurality of anti-slip grooves arranged in a circumferential array.
[0010] Optionally, the card holder has a pair of arc-shaped grooves for the hand to pass through.
[0011] In summary, this application includes at least one of the following beneficial technical effects:
[0012] This invention utilizes the cooperation of a first input terminal, a second input terminal, a connecting sleeve, a connecting plate, a card holder, and a locking block. When using the built-in motor overheat automatic power-off protection device, the second input terminal can be rotated for storage, ensuring that the second input terminal is less susceptible to external impact and preventing bending damage. Simultaneously, the second input terminal rotates from the storage state to the use state at the end of the first input terminal, and the second locking mechanism locks the second input terminal in the use state, thus ensuring stable conductivity. Furthermore, the switching process between the two states is quick and easy to operate. Attached Figure Description
[0013] Figure 1 A schematic diagram of the first state structure of the built-in motor overheat automatic power-off protection device of this utility model is provided.
[0014] Figure 2 A schematic diagram of the second state structure of the built-in motor overheat automatic power-off protection device of this utility model is provided.
[0015] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0016] Figure 4 for Figure 3A cross-sectional diagram showing the disassembled structure of the connecting sleeve and the locking sleeve block;
[0017] Figure 5 for Figure 3 A cross-sectional view of the first and second input terminals.
[0018] Reference numerals: 1. Thermal relay; 11. Protrusion; 12. First input terminal; 13. Second input terminal; 14. Rotating groove; 15. Rotating shaft; 16. Locking block; 17. Locking slot; 18. Spiral sleeve; 19. Rotating block; 2. Locking seat; 21. Locking groove; 3. Connecting sleeve; 31. Support sleeve; 32. Locking sleeve; 4. Locking block; 41. Inner ring locking block; 5. Connecting plate. Detailed Implementation
[0019] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0020] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.
[0021] 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.
[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0024] 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.
[0025] Example
[0026] like Figures 1 to 5 As shown, the built-in automatic power-off protection device for motor overheating proposed in this utility model includes a thermal relay 1. The thermal relay 1 has multiple protrusions 11, each with a corresponding first input terminal 12 inside. A rotating block 19 is fixed to the end of each first input terminal 12, enabling rotatable connection between the first input terminal 12 and a second input terminal 13 via the rotating block 19; this is one of the current transmission components. The end of the first input terminal 12 is rotatably connected to the second input terminal 13. When the second input terminal 13 is in its retracted state, it is engaged in a locking groove 21. In its operational state, it is located on the same axis as the first input terminal 12 and is fixed by a second locking mechanism. A connecting sleeve 3 is slidably fitted onto each second input terminal 13. The connecting sleeve 3 is slidably fitted onto the second input terminal 13, and its outer wall is fixedly connected to the end of a connecting plate 5, sliding along the second input terminal 13 under the influence of the connecting plate 5. The middle part of the second input terminal 13 is provided with a connecting plate 5 that fixes multiple ends to the outer wall of the corresponding connecting sleeve 3. The connecting plate 5 is slidably sleeved on the second input terminal 13, and the outer wall is fixedly connected to the end of the connecting plate 5. Under the action of the connecting plate 5, it slides along the second input terminal 13.
[0027] Among them, such as Figures 1 to 2As shown, the outer wall of the thermal relay 1 is provided with a first locking mechanism. The first locking mechanism includes a retainer 2 fixedly connected to the outer wall of the thermal relay 1. The retainer 2 is fixedly connected to the outer wall of the thermal relay 1 and has locking slots 21 and arc-shaped grooves for temporarily fixing the second input terminal 13 and facilitating hand operation. The retainer 2 has a pair of arc-shaped grooves for the hand to pass through, and multiple locking slots 21 for locking the end of the second input terminal 13. The locking slots 21 are formed on the retainer 2 and lock the end of the second input terminal 13, providing a temporary fixing effect to the second input terminal 13 and preventing it from shaking.
[0028] Secondly, such as Figure 4 As shown, a second locking mechanism is provided on one of the protrusions 11 and the connecting sleeve 3. The second locking mechanism includes a support sleeve 31 fixedly connected to the end of one of the connecting sleeves 3. The support sleeve 31 is fixedly connected to the end of one of the connecting sleeves 3 and slidably sleeved with the second input terminal 13, providing a carrier for the movable connection of the locking sleeve 4. The support sleeve 31 is slidably sleeved with the second input terminal 13. The end of the support sleeve 31 away from the connecting sleeve 3 is also fixedly connected to a retaining sleeve 32 that is slidably sleeved with the second input terminal 13. The retaining sleeve 32 is fixedly connected to the end of the support sleeve 31 away from the connecting sleeve 3 and slidably sleeved with the second input terminal 13, which can lock the inner ring retaining block 41 of the locking sleeve 4, causing the connecting sleeve 3 to slide.
[0029] In addition, such as Figures 1 to 4 As shown, a locking sleeve 4 is movably connected to the support sleeve 31. The locking sleeve 4 is movably connected to the support sleeve 31 and screws into the spiral sleeve 18, thus fixing the usage state of the second input terminal 13 by cooperating with related components. The outer wall of the locking sleeve 4 has multiple anti-slip grooves arranged in a circumferential array. An inner ring retaining block 41, which is held in place by a retaining sleeve 32, is fixedly connected to the inner wall of the locking sleeve 4 near the connecting sleeve 3. This allows the locking sleeve 4 to drive the support sleeve 31 and the connecting sleeve 3 to slide. A spiral sleeve 18, which screws into the locking sleeve 4, is fixedly connected to one of the protrusions 11, thus locking the usage state of the second input terminal 13.
[0030] It is worth noting that, such as Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, a rotating block 19 is fixedly connected to one end of the first input terminal 12 near the second input terminal 13. The rotating block 19 is fixed to the end of the first input terminal 12 near the second input terminal 13 and is engaged in a rotating groove 14, cooperating with a rotating shaft 15 to achieve a rotatable connection between the first input terminal 12 and the second input terminal 13. A rotating groove 14 is provided at the end of the second input terminal 13 near the first input terminal 12 for the rotating block 19 to engage, providing a mating structure for the rotatable connection between the two. A rotating shaft 15 is also provided at the end of the second input terminal 13 near the rotating groove 14, movably passing through the rotating block 19. The rotating shaft 15 movably passes through the rotating block 19, and locking blocks 16 are fixed at both ends, rotatably connecting the first input terminal 12 and the second input terminal 13 together.
[0031] Furthermore, such as Figure 3 and Figure 5 As shown, a pair of slots 17 are also provided at one end of the second input terminal 13 near the rotating groove 14. The slots 17 are provided at one end of the second input terminal 13 near the rotating groove 14 for the locking blocks 16 to be inserted, which serves to limit the rotation of the shaft 15. Both ends of the rotating shaft 15 are fixedly connected to locking blocks 16 that are inserted into the slots 17. The locking blocks 16 are fixed at both ends of the rotating shaft 15 and embedded in the slots 17 to prevent the rotating shaft 15 from falling off the rotating block 19 and the second input terminal 13, thus ensuring the stability of the rotational connection.
[0032] In this embodiment, when using the built-in motor overheat automatic power-off protection device, the first input terminal 12 is engaged in the rotating groove 14 of the second input terminal 13 via the end rotating block 19, and then the rotating shaft 15 passes through the rotating block 19, with the locking blocks 16 at both ends embedded in the locking groove 17 to complete the rotational connection. At this time, the connecting sleeve 3 on the second input terminal 13 is kept in position synchronously by the connecting plate 5, and the locking groove 21 of the locking seat 2 can temporarily lock the end of the second input terminal 13 to prevent shaking.
[0033] When multiple second input terminals 13 are needed, simply pass them manually through the arc-shaped groove of the card holder 2, then bend a pair of connecting plates 5. This, through multiple connecting sleeves 3, causes the second input terminal 13 to return to the same axis as the first input terminal 12. Then, push the locking sleeve block 4 on one of the second input terminals 13, causing its support sleeve 31 and card sleeve 32 to slide along the second input terminal 13 until the inner ring block 41 inside the locking sleeve block 4 locks the card sleeve 32, causing the connecting sleeve 3 to slide. The connecting sleeve 3, in turn, causes the other connecting sleeve 3 to slide along the second input terminal 13 through the connecting plate 5. Finally, the locking sleeve block 4 and the spiral insert 18 are spirally engaged, so that each connecting sleeve 3 locks the corresponding locking block 16 at the end of the first input terminal 12, thus keeping the second input terminal 13 and the corresponding first input terminal 12 on the same axis.
[0034] When the motor is overloaded, the thermal relay 1 detects the abnormal current and triggers power-off. The above structure, through the rotational connection of the first input terminal 12 and the second input terminal 13 and a pair of locking mechanisms, not only ensures the stability of the conductive connection between the first input terminal 12 and the second input terminal 13, but also reduces the risk of external collision by rotating and storing the second input terminal 13.
[0035] The preferred embodiments of this utility model described above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A built-in automatic power-off protection device for motor overheating, comprising a thermal relay (1), wherein the thermal relay (1) is provided with a plurality of protrusions (11), and each protrusion (11) is provided with a corresponding first input terminal (12), characterized in that, Also includes: A second input terminal (13) is rotatably connected to the end of the first input terminal (12). A connecting sleeve (3) is slidably sleeved on each of the second input terminals (13). A connecting plate (5) is provided in the middle of the second input terminal (13) so that multiple ends are fixedly connected to the outer wall of the corresponding connecting sleeve (3). A first locking mechanism is provided on the outer wall of the thermal relay (1), and a second locking mechanism is provided on one of the protrusions (11) and the connecting sleeve (3).
2. The built-in automatic power-off protection device for motor overheating according to claim 1, characterized in that, The first locking mechanism includes a card holder (2) fixedly connected to the outer wall of the thermal relay (1), and the card holder (2) has a plurality of locking slots (21) for locking the end of the second input terminal (13).
3. The built-in automatic power-off protection device for motor overheating according to claim 1, characterized in that, The second locking mechanism includes a support sleeve (31) fixedly connected to the end of one of the connecting sleeves (3), the support sleeve (31) being slidably sleeved with the second input terminal (13), and a retainer (32) slidably sleeved with the second input terminal (13) being fixedly connected to the end of the support sleeve (31) away from the connecting sleeve (3), a locking sleeve block (4) being movably connected to the support sleeve (31), and an inner ring retainer block (41) being stuck by the retainer block (32) being fixedly connected to the inner wall of the end of the locking sleeve block (4) close to the connecting sleeve (3), and a spiral insert (18) being spirally sleeved with the locking sleeve block (4) being fixedly connected to one of the protrusions (11).
4. The built-in automatic power-off protection device for motor overheating according to claim 1, characterized in that, A rotating block (19) is fixedly connected to one end of the first input terminal (12) near the second input terminal (13). A rotating groove (14) for the rotating block (19) to be inserted is provided at one end of the second input terminal (13) near the first input terminal (12). A rotating shaft (15) that can move through the rotating block (19) is also provided at one end of the second input terminal (13) near the rotating groove (14).
5. The built-in automatic power-off protection device for motor overheating according to claim 4, characterized in that, The second input terminal (13) is provided with a pair of slots (17) at one end near the rotating groove (14), and both ends of the rotating shaft (15) are fixedly connected with a block (16) that is inserted into the slot (17).
6. The built-in automatic power-off protection device for motor overheating according to claim 3, characterized in that, The outer wall of the locking sleeve (4) is provided with multiple anti-slip grooves arranged in a circumferential array.
7. The built-in automatic power-off protection device for motor overheating according to claim 2, characterized in that, The card holder (2) has a pair of arc-shaped grooves for the hand to pass through.