A cable short-time overload temperature rise protection device

Abstract

The utility model discloses a kind of cable short-time overload temperature rise protection devices, it is related to cable protection device technical field, it includes shell, the inside sliding connection of shell has cable conductor one and cable conductor two, the outside of cable conductor one is equipped with circuit breaking mechanism, the circuit breaking mechanism includes copper sheet, the bottom of copper sheet is fixedly connected with shape memory alloy spring, the bottom of shape memory alloy spring is fixedly connected with transmission rod, the outside sliding connection of transmission rod has lever, the top of lever is fixedly connected with reset component, the bottom of lever is fixedly connected with movable contact. In the utility model, shape memory alloy spring is deformed due to overload temperature rise, drives transmission rod, lever, makes movable contact and conductor separate, can quickly cut off overload circuit, protect cable, temperature restores and is automatically conducted by reset spring, improve the response speed of device to cable short-time overload temperature rise.

Description

Technical Field

[0001] This application relates to the field of cable protection device technology, and in particular to a cable short-time overload temperature rise protection device. Background Technology

[0002] With the rapid development of the power industry, cables, as the core carrier of power transmission, are widely used in urban power grids, industrial enterprises, rail transit, and many other fields. Their safe and stable operation is directly related to the reliability of power installations and even the normal order of social production and life. However, in actual operation, due to factors such as instantaneous fluctuations in power load, equipment failures, and sudden operations, cables often face short-term overload situations. Although short-term overloads are brief, they can cause the cable conductor temperature to rise sharply in a short period of time. If effective protective measures are not taken in time, it will not only accelerate the aging of the cable insulation layer and shorten the cable's service life, but in severe cases, it may even cause safety accidents such as insulation breakdown, short circuits, and fires, resulting in huge economic losses and safety hazards.

[0003] Traditional cable protection devices mostly rely on temperature monitoring, using sensors such as thermocouples and resistance temperature detectors (RTDs) to collect temperature data. However, their signal transmission and processing are relatively slow, making it difficult to achieve real-time detection in short-term overload scenarios where cable temperatures rise rapidly. Furthermore, some protection devices have complex decision-making logic, requiring multiple layers of data verification and analysis before making a protection decision, further extending the response time.

[0004] In the existing technology, some cable protection devices have obvious defects in response speed when dealing with short-term overload temperature rise problems. When a cable experiences a short-term overload, the temperature often exceeds the safety threshold in a few seconds or even less. However, the cable has already suffered irreversible damage before the protection device with insufficient response speed has completed the monitoring, analysis and decision-making process, and thus cannot play a full protective role. In order to address the above problems, a cable short-term overload temperature rise protection device is proposed. Utility Model Content

[0005] The purpose of this application is to provide a cable short-time overload temperature rise protection device, which aims to improve the problem that some protection devices have a slow response speed when the cable is overloaded.

[0006] The cable short-time overload temperature rise protection device provided in this application adopts the following technical solution:

[0007] A cable short-time overload temperature rise protection device includes a housing, inside which a cable conductor one and a cable conductor two are slidably connected, outside of the cable conductor one is a circuit breaking mechanism, and inside the housing is an opening and closing mechanism rotatably connected.

[0008] The circuit breaking mechanism includes a copper sheet, the inside of which is fixedly connected to the outside of the first cable conductor. The top of the copper sheet is fixedly connected to the inner wall of the housing. A shape memory alloy spring is fixedly connected to the bottom of the copper sheet. A transmission rod is fixedly connected to the bottom of the shape memory alloy spring. A lever is slidably connected to the outside of the transmission rod. A reset assembly is fixedly connected to the top of the lever. A moving contact is fixedly connected to the bottom of the lever. The outside of the moving contact is in contact with the first cable conductor and the second cable conductor. A guide assembly is fixedly connected to the inner wall of the housing.

[0009] Through the above technical solution: the device uses a shape memory alloy spring to sense temperature and trigger, lever transmission to achieve rapid circuit breaking, reset component for easy recovery, guide component to ensure stable operation, can effectively protect cables from short-term overload, and improve electrical safety and equipment life.

[0010] Preferably, the opening and closing mechanism includes a flip cover, the outside of which is rotatably connected to the inside of the housing, a baffle is fixedly connected to the inside of the housing, one outer side of the flip cover is in contact with the outside of the baffle, a fixing seat is fixedly connected to the outside of the flip cover, and a limit assembly is fixedly connected to the outside of the housing.

[0011] Through the above technical solution: the opening and closing mechanism includes a flip cover, the outside of which is rotatably connected to the inside of the housing, a baffle is fixedly connected inside the housing, one side of the flip cover is in contact with the outside of the baffle, a fixed seat is fixedly connected to the outside of the flip cover, and a limit component is fixedly connected to the outside of the housing, which can stably limit the rotation angle of the flip cover, improve the smoothness of opening and closing, and enhance the overall stability and service life of the mechanism.

[0012] Preferably, the guide assembly includes a fixed plate, the bottom of which is fixedly connected to the inner wall of the housing, and a slider is fixedly connected to the outside of the transmission rod, the outside of which is slidably connected to the inside of the fixed plate.

[0013] Through the above technical solution: the guide component includes a fixed plate, the bottom of which is fixedly connected to the inner wall of the housing, and a slider is fixedly connected to the outside of the transmission rod. The outside of the slider is slidably connected to the inside of the fixed plate, which can accurately guide the movement trajectory of the transmission rod, reduce shaking and friction, and improve transmission stability and component operation smoothness.

[0014] Preferably, the reset assembly includes a reset spring, the top of which is fixedly connected to the inner wall of the housing, and the bottom of which is fixedly connected to the top of the lever.

[0015] Through the above technical solution: the reset component includes a reset spring, the top of which is fixedly connected to the inner wall of the housing, and the bottom of which is fixedly connected to the top of the lever. This allows the lever to be quickly reset, ensuring timely action response, reducing jamming, and enhancing the reliability of the mechanism's cyclic operation.

[0016] Preferably, the limiting component includes a limiting seat, the outer side of which is fixedly connected to the outside of the housing, a limiting plate is slidably connected inside the limiting seat, and the outer side of the limiting plate is slidably connected to the inside of the fixed seat.

[0017] Through the above technical solution: the limiting component includes a limiting seat, the outer side of which is fixedly connected to the outside of the housing, a limiting plate is slidably connected inside the limiting seat, and the outer side of the limiting plate is slidably connected to the inside of the fixed seat, which can accurately limit the flip position, prevent excessive rotation, and enhance the structural positioning accuracy and safety of use.

[0018] Preferably, a support plate is fixedly connected to the inner wall of the housing, and the lever is rotatably connected to the inside of the support plate.

[0019] Through the above technical solution: the inner wall of the shell is fixedly connected to a support plate, and the external rotatable connection of the lever is connected to the inside of the support plate, providing a stable support point for the lever, ensuring flexible rotation without jamming, improving the force transmission efficiency, and enhancing the stability and structural strength of the mechanism.

[0020] Preferably, the housing has two cable interfaces inside, and a fixing rod is fixedly connected to the inner wall of the housing.

[0021] Through the above technical solution: the inside of the housing is provided with two cable interfaces, which can connect multiple sets of cables at the same time to meet expansion needs. The inner wall of the housing is fixedly connected with a fixing rod, which can strengthen the structural strength of the housing, reduce deformation, and improve the overall stability and cable connection reliability.

[0022] Preferably, a circular sleeve is fixedly connected to the outside of the fixing rod, and the outside of both the first cable conductor and the second cable conductor are fixedly connected to the inside of the circular sleeve.

[0023] Through the above technical solution: the fixed rod is externally fixedly connected to a circular sleeve, and the outer sides of cable conductor one and cable conductor two are both fixedly connected to the inside of the circular sleeve, which can firmly bind the conductors to prevent shaking and wear, ensure stable conductive contact, and enhance the regularity of cable layout and safety of use.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. In this utility model, the shape memory alloy spring deforms due to overload temperature rise, which drives the transmission rod and lever, causing the moving contact to separate from the conductor. This can quickly cut off the overload circuit, protect the cable, and automatically connect the circuit after the temperature recovers by means of the reset spring. It has both protection and self-recovery properties, and improves the response speed of the device to short-term overload temperature rise of the cable.

[0026] 2. In this utility model, by sliding the limiting plate inside the limiting seat, the locking of the fixed seat is released, the flip cover is flipped to open the internal space, and after maintenance, the flip cover is reversed to make the baffle block, and then the limiting plate is slid into the fixed seat to lock, which facilitates daily inspection and maintenance of the device. The limiting component stably locks the flip cover, ensuring the sealing and safety of the device, improving the convenience and reliability of device maintenance, and helping the device to operate stably for a long time. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of a cable short-time overload temperature rise protection device proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the copper sheet in a cable short-time overload temperature rise protection device proposed in this utility model;

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a schematic diagram of the structure of the limiting plate of a cable short-time overload temperature rise protection device proposed in this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Housing; 2. Cable conductor one; 3. Cable conductor two; 4. Circuit breaking mechanism; 41. Copper sheet; 42. Shape memory alloy spring; 43. Transmission rod; 44. Lever; 45. Support plate; 46. Reset assembly; 461. Reset spring; 47. Moving contact; 48. Guide assembly; 481. Fixing plate; 482. Slider; 5. Opening and closing mechanism; 51. Flip cover; 52. Baffle; 53. Fixing seat; 54. Limiting assembly; 541. Limiting seat; 542. Limiting plate; 6. Cable interface; 7. Fixing rod; 8. Circular sleeve. Detailed Implementation

[0033] The following combination Figures 1-4 This application will be described in further detail below.

[0034] Example: A cable short-time overload temperature rise protection device, referring to... Figures 1 to 3The device includes a housing 1, which serves as the basic load-bearing component of the entire device. Inside the housing 1, there are two cable conductors 2 and 3 that are slidably connected. The cable conductors 2 and 3 are the core conductive components for transmitting current in the device. The cable conductor 2 is provided with a circuit breaking mechanism 4 on its exterior. Inside the housing 1, there is an opening and closing mechanism 5 that is rotatably connected.

[0035] The circuit breaker mechanism 4 includes a copper sheet 41, which facilitates the transfer of current from the cable conductor 2 to the copper sheet 41. The inside of the copper sheet 41 is fixedly connected to the outside of the cable conductor 2, and the top of the copper sheet 41 is fixedly connected to the inner wall of the housing 1. A shape memory alloy spring 42 is fixedly connected to the bottom of the copper sheet 41. When the cable experiences a short-term overload and the temperature rises, the shape memory alloy spring 42 deforms, driving the transmission rod 43 to move. The bottom of the shape memory alloy spring 42 is fixedly connected to the transmission rod 43, which transmits the force generated by the deformation of the shape memory alloy spring 42 to the lever 44. A lever 44 is slidably connected to the outside of the transmission rod 43. The lever 44 rotates around the fulcrum under the push of the transmission rod 43, realizing the contact and separation of the moving contact 47 with the first cable conductor 2 and the second cable conductor 3, thus completing the circuit breaking operation. A reset component 46 is fixedly connected to the top of the lever 44, and a moving contact 47 is fixedly connected to the bottom of the lever 44. When the moving contact 47 contacts the first cable conductor 2 and the second cable conductor 3, the circuit is connected; when separated, the circuit is broken. The outside of the moving contact 47 is in contact with the first cable conductor 2 and the second cable conductor 3. A guide component 48 is fixedly connected to the inner wall of the housing 1.

[0036] The guide assembly 48 includes a fixed plate 481, which provides a sliding track for the slider 482 on the transmission rod 43. The bottom of the fixed plate 481 is fixedly connected to the inner wall of the housing 1. The slider 482 is fixedly connected to the outside of the transmission rod 43. The slider 482 ensures that the transmission rod 43 can only move in the vertical direction. The outside of the slider 482 is slidably connected to the inside of the fixed plate 481. The reset assembly 46 includes a reset spring 461, which mainly plays a reset role. When the temperature returns to normal, the shape memory alloy spring 42 returns to its original shape. The elastic force of the reset spring 461 can pull the lever 44 to rotate in the opposite direction, causing the moving contact 47 to re-contact the cable conductor 2 and the second cable conductor 3, so that the circuit is restored to conduction. The top of the reset spring 461 is fixedly connected to the inner wall of the housing 1, and the bottom of the reset spring 461 is fixedly connected to the top of the lever 44.

[0037] Specifically, when the cable is operating normally, the shape memory alloy spring 42 maintains its initial shape, and the moving contact 47 is in contact with cable conductor 2 and cable conductor 3. Current is transmitted through cable conductor 2, copper sheet 41, moving contact 47, and cable conductor 3. If the cable experiences a short-term overload, the temperature rises, triggering the shape memory alloy spring 42 to deform, pushing the transmission rod 43. The transmission rod 43 moves along the fixed plate 481 via the slider 482, causing the lever 44 to rotate around the support plate 45, separating the moving contact 47 from cable conductor 2 and cable conductor 3, cutting off the circuit. At the same time, the return spring 461 contracts. When the overload is released and the temperature returns to normal, the shape memory alloy spring 42 returns to its original shape, and the return spring 461 pulls the lever 44 in reverse, causing the moving contact 47 to re-contact the conductors, and the circuit is completed.

[0038] Reference Figure 4 The opening and closing mechanism 5 includes a flip cover 51, which can be flipped around a rotation axis to open and close a portion of the internal space of the housing 1. The outside of the flip cover 51 is rotatably connected to the inside of the housing 1. A baffle 52 is fixedly connected inside the housing 1. The outside of the baffle 52 contacts the outside of the baffle 52 and uses its own structure to prevent the flip cover 51 from flipping excessively, so that the flip cover 51 is kept in a set closed position. The outside of the flip cover 51 contacts the outside of the baffle 52. A fixed seat 53 is fixedly connected to the outside of the flip cover 51. When the flip cover 51 is closed, a limiting plate 542 can slide into the fixed seat 53 to limit and fix the flip cover 51. A limiting component 54 is fixedly connected to the outside of the housing 1.

[0039] The limiting assembly 54 includes a limiting seat 541, which provides a sliding mounting base for the limiting plate 542. The outer side of the limiting seat 541 is fixedly connected to the outside of the housing 1. The limiting plate 542 is slidably connected inside the limiting seat 541. The limiting plate 542 can slide inside the limiting seat 541. When the flip cover 51 is closed and the fixing seat 53 corresponds to the limiting seat 541, the limiting plate 542 is slid to insert into the fixing seat 53, locking the flip cover 51 in the closed state. When it is necessary to open the flip cover 51, the limiting plate 542 is slid in the opposite direction to release the lock. The outer side of the limiting plate 542 is slidably connected to the inside of the fixing seat 53.

[0040] Specifically, when it is necessary to open the internal space of the housing 1, slide the limiting plate 542 inside the limiting seat 541 to disengage it from the fixed seat 53, thereby releasing the lock on the flip cover 51. Then, flip the flip cover 51 to open it. When closing, flip the flip cover 51 until it contacts the baffle 52, so that the fixed seat 53 corresponds to the limiting seat 541. Then slide the limiting plate 542 into the fixed seat 53 to lock the flip cover 51 in the closed state.

[0041] Reference Figure 2A support plate 45 is fixedly connected to the inner wall of the housing 1. The support plate 45 is used to provide a fulcrum for the lever 44. The lever 44 is rotatably connected to the inside of the support plate 45. Two cable interfaces 6 are provided inside the housing 1. The cable interfaces 6 are used to connect the external cable to the cable conductor 2 and cable conductor 3 inside the device. A fixing rod 7 is fixedly connected to the inner wall of the housing 1. The fixing rod 7 provides installation support for the circular sleeve 8. The circular sleeve 8 is fixedly connected to the outside of the fixing rod 7. The circular sleeve 8 is used to fix the outside of the cable conductor 2 and cable conductor 3, so that the two maintain a relatively stable position and spacing inside the housing 1. The outside of the cable conductor 2 and the outside of the cable conductor 3 are both fixedly connected to the inside of the circular sleeve 8.

[0042] Specifically, the external cable is connected to the cable conductor 2 and cable conductor 3 inside the device through two cable interfaces 6 respectively. The fixing rod 7 supports the circular sleeve 8, which fixes the external parts of the cable conductor 2 and cable conductor 3, so that the two maintain a relatively stable position and spacing inside the housing 1.

[0043] The implementation principle of this embodiment is as follows: When the cable is in normal working condition, the shape memory alloy spring 42 maintains its initial shape, and the moving contact 47 is in contact with cable conductor 2 and cable conductor 3. Current is transmitted through cable conductor 2, copper sheet 41, moving contact 47, and cable conductor 3. If the cable is briefly overloaded, the temperature rises to the trigger threshold of the shape memory alloy spring 42, and the shape memory alloy spring 42 deforms. This deformation pushes the transmission rod 43, which in turn moves along the fixed plate 481 via the slider 482. This causes lever 44 to rotate around support plate 45, causing moving contact 47 to separate from cable conductor 1 2 and cable conductor 2 3, cutting off the circuit. At the same time, return spring 461 contracts. After the overload is released and the temperature returns to normal, shape memory alloy spring 42 returns to its original shape, and return spring 461 restores its deformation and generates elastic force. The elastic force pulls lever 44 to rotate in the opposite direction, and moving contact 47 re-contacts cable conductor 1 2 and cable conductor 2 3, restoring the circuit to conduction. Fixed rod 7 and circular sleeve 8 cooperate to support cable conductor 1 2 and cable conductor 2 3.

[0044] During maintenance, the limiting plate 542 in the sliding limiting seat 541 is used to release the lock on the fixed seat 53. The flip cover 51 can be flipped to open the internal space of the housing 1. After the inspection and maintenance are completed, the operation is reversed so that the flip cover 51 is pressed against the baffle 52. Then the sliding limiting plate 542 is inserted into the fixed seat 53 to lock the flip cover 51, which facilitates the daily maintenance of the device.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cable short-time overload temperature rise protection device, comprising a housing (1), characterized in that: The housing (1) has a sliding connection between a first cable conductor (2) and a second cable conductor (3), and a circuit breaker (4) is provided on the outside of the first cable conductor (2). The housing (1) has a rotating connection between an opening and closing mechanism (5). The circuit breaking mechanism (4) includes a copper sheet (41), the inside of which is fixedly connected to the outside of the first cable conductor (2), the top of which is fixedly connected to the inner wall of the housing (1), the bottom of which is fixedly connected to a shape memory alloy spring (42), the bottom of which is fixedly connected to a transmission rod (43), the outside of which is slidably connected to a lever (44), the top of which is fixedly connected to a reset assembly (46), the bottom of which is fixedly connected to a moving contact (47), the outside of which is in contact with the first cable conductor (2) and the second cable conductor (3), and the inner wall of the housing (1) is fixedly connected to a guide assembly (48).

2. The cable short-time overload temperature rise protection device according to claim 1, characterized in that: The opening and closing mechanism (5) includes a flip cover (51), the outside of which is rotatably connected to the inside of the housing (1). A baffle (52) is fixedly connected inside the housing (1). The outside of the flip cover (51) is in contact with the outside of the baffle (52). A fixing seat (53) is fixedly connected to the outside of the flip cover (51). A limit assembly (54) is fixedly connected to the outside of the housing (1).

3. The cable short-time overload temperature rise protection device according to claim 1, characterized in that: The guide assembly (48) includes a fixed plate (481), the bottom of which is fixedly connected to the inner wall of the housing (1), and a slider (482) is fixedly connected to the outside of the transmission rod (43), the outside of which is slidably connected to the inside of the fixed plate (481).

4. The cable short-time overload temperature rise protection device according to claim 1, characterized in that: The reset assembly (46) includes a reset spring (461), the top of which is fixedly connected to the inner wall of the housing (1), and the bottom of which is fixedly connected to the top of the lever (44).

5. A cable short-time overload temperature rise protection device according to claim 2, characterized in that: The limiting component (54) includes a limiting seat (541), the outer side of which is fixedly connected to the outside of the housing (1), a limiting plate (542) is slidably connected inside the limiting seat (541), and the outer side of the limiting plate (542) is slidably connected to the inside of the fixed seat (53).

6. The cable short-time overload temperature rise protection device according to claim 1, characterized in that: The inner wall of the housing (1) is fixedly connected to a support plate (45), and the external part of the lever (44) is rotatably connected to the inside of the support plate (45).

7. A cable short-time overload temperature rise protection device according to claim 1, characterized in that: The housing (1) has two cable interfaces (6) inside, and a fixing rod (7) is fixedly connected to the inner wall of the housing (1).

8. A cable short-time overload temperature rise protection device according to claim 7, characterized in that: The fixed rod (7) is fixedly connected to the outside of a circular sleeve (8), and the outside of the first cable conductor (2) and the outside of the second cable conductor (3) are both fixedly connected to the inside of the circular sleeve (8).

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