Mechanical interlock mechanism for emergency starting device

Abstract

The utility model relates to low -voltage electrical apparatus technical field, a kind of mechanical interlocking mechanism of emergency starting device, comprising: assembly shell, the inside of assembly shell is equipped with assembly cavity, assembly cavity penetrates the top side wall of assembly shell;Two locking pieces, both are located in assembly cavity, and structure mirror image symmetry, the first end of locking piece is rotatably connected with the inner wall of assembly cavity, the second end of locking piece is from the top of assembly shell to the outside of assembly shell, there is gap between the second end of two locking pieces, the length of locking piece is greater than half of the length of assembly shell.The utility model in use, the locking piece of any side can form hindrance to the locking piece of other side after rotation, can avoid misoperation after starting, star starting circuit and angle starting circuit cannot be connected simultaneously, can guarantee power supply or motor not be burnt.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a mechanical interlock mechanism for an emergency start device. Background Technology

[0002] When a high-power motor starts, it generates a large current. This current causes a significant voltage drop across the entire circuit within a short period, which can not only affect the starting of the motor itself but also lead to malfunctions in other motors and appliances on the circuit. Therefore, star-delta starting is necessary to avoid such problems. The principle of star-delta starting is to first connect the star starting circuit to allow the motor to start with reduced voltage, then disconnect the star starting circuit, and finally connect the delta starting circuit to allow the motor to start smoothly. This requires that the delta starting circuit must not be connected when the star starting circuit is connected, otherwise it will cause the power supply or the motor to burn out.

[0003] In the control circuit of the fire cabinet, under normal circumstances, star-delta reduced-voltage starting is achieved by supplying power to the coil, and electrical interlocking is used to prevent the star and delta starting circuits from being activated simultaneously. However, in extreme situations such as fire, the control circuit may fail to be energized. In this case, a manual emergency starting device is needed to activate the contactor to start the motor, but the electrical interlocking will fail. If the star and delta starting circuits are accidentally activated simultaneously, it will cause great damage. Utility Model Content

[0004] The purpose of this utility model is to provide a mechanical interlocking mechanism for an emergency starting device, in which the locking member on either side can obstruct the locking member on the other side after rotation, and the star starting circuit and the corner starting circuit will not be connected at the same time.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a mechanical interlocking mechanism for an emergency start device, comprising: an assembly shell, wherein the assembly shell has an assembly cavity inside, the assembly cavity penetrating the top side wall of the assembly shell; two locking members, both disposed within the assembly cavity and having a mirror-symmetrical structure, wherein the first end of the locking member is rotatably connected to the inner wall of the assembly cavity, the second end of the locking member extends from the top of the assembly shell to the outer side of the assembly shell, a gap exists between the second ends of the two locking members, and the length of the locking member is greater than half the length of the assembly shell.

[0006] Preferably, the locking member has a ring-shaped structure, and each locking member has a concave portion in the middle and a protruding portion above the concave portion. The concave portion and the protruding portion together form an S-shaped structure.

[0007] Preferably, a first boss is fixedly provided at the first end of the locking member, and a second boss is provided on the inner wall of the assembly cavity. The first boss and the second boss are rotatably connected, and there is a gap between the locking member and the inner wall of the assembly cavity.

[0008] Preferably, the second end of the locking member is provided with a force-bearing block, and both sides of the force-bearing block are provided with a first inclined surface. The top of the force-bearing block and located between the two first inclined surfaces are provided with a second inclined surface, and the width of the force-bearing block is greater than the width of the locking member.

[0009] Preferably, a spring is provided between the locking member and the inner wall of the assembly cavity, a protrusion is provided at the bottom of the locking member, a groove is provided on the bottom inner wall of the assembly cavity, a first end of the spring is fixedly connected to the protrusion, and a second end of the spring extends into the groove and is fixedly connected to the inner wall of the groove.

[0010] Preferably, a stop is provided at the top of the assembly shell on the side away from each of the two locking members, a first connecting part is provided on the inner wall of the assembly cavity between the two recesses, and two second connecting parts are provided at the bottom of the outer wall of the assembly shell.

[0011] The beneficial effects of using this utility model are:

[0012] In use, the locking element on either side can obstruct the locking element on the other side after rotation, preventing accidental operation after startup. The star-start circuit and the delta-start circuit will not be activated simultaneously, ensuring that the power supply or motor is not burned out. When the locking element rotates, it can compress the spring, allowing the spring to store elastic potential energy. When the spring extends, it can use its elastic characteristics to drive the locking element to reset. Attached Figure Description

[0013] Figure 1 This is the front view of the present invention;

[0014] Figure 2 This is a front view of the assembly shell in this utility model;

[0015] Figure 3 This is an isometric view of the locking component in this utility model;

[0016] Figure 4 This is an isometric view of the present invention after it has been installed inside the switch base;

[0017] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0018] Figure 6 This is an isometric view of the present invention when the corner start circuit is turned on;

[0019] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0020] Figure 8 This is a front view of the present invention when the corner start circuit is turned on;

[0021] Figure 9 An isometric view of this utility model when the star-start circuit is turned on;

[0022] Figure 10 This is the front view of the present invention when the star-start circuit is turned on.

[0023] The reference numerals in the figures include:

[0024] 1-Assembly housing, 11-Assembly cavity, 12-Groove, 13-Stop, 14-First connecting part, 15-Second connecting part, 2-Locking element, 21-Concave part, 22-Protrusion, 23-Force-bearing block, 231-First inclined surface, 232-Second inclined surface, 24-Protruding post, 3-First boss, 4-Second boss, 5-Spring, 6-Switch base, 61-Third boss, 7-Angle contactor contact system, 71-First protrusion, 8-Star contactor contact system, 81-Second protrusion. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this technical solution clearer, the following detailed description, in conjunction with specific embodiments, further illustrates this technical solution. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this technical solution.

[0026] Please see Figure 1-10 This utility model provides a technical solution: a mechanical interlock mechanism for an emergency start device, comprising an assembly shell 1 and two locking members 2. The assembly shell 1 has an assembly cavity 11 inside, and both locking members 2 are disposed within the assembly cavity 11, with a mirror-symmetrical structure. The first end of each locking member 2 is rotatably connected to the inner wall of the assembly cavity 11, and the second end of each locking member 2 extends from the top of the assembly shell 1 to the outside of the assembly shell 1. When either locking member 2 rotates around its first end toward the interior of the assembly cavity 11, the second end of the locking member 2 moves to a position below the second end of the other locking member 2, thereby hindering the rotation of the other locking member 2.

[0027] Please see Figure 1-3 , Figure 8 and Figure 10Each locking member 2 has a recessed portion 21 in the middle, and a protrusion 22 above the recessed portion 21. The recessed portion 21 and the protrusion 22 together form an S-shaped structure. When any one locking member 2 rotates into the assembly cavity 11, the protrusion 22 on the rotated locking member 2 enters the inner side of the recessed portion 21 of the other locking member 2, thereby hindering the rotation of the other locking member 2.

[0028] Please see Figure 1-3 The locking member 2 has a first boss 3 fixedly provided at its first end, and a second boss 4 is provided on the inner wall of the assembly cavity 11. A cylindrical pin passes through the first boss 3 and the second boss 4 to install the locking member 2 inside the assembly cavity 11, allowing the locking member 2 to rotate freely. The cooperation of the first boss 3 and the second boss 4 creates a gap between the locking member 2 and the inner wall of the assembly cavity 11, reducing the contact area between the locking member 2 and the inner wall of the assembly cavity 11, thereby reducing frictional resistance.

[0029] Please see Figure 1-10 The second end of the locking member 2 is provided with a force-receiving block 23, on which a first inclined surface 231 and a second inclined surface 232 are provided. The output ends of the angle contactor contact system 7 and the star contactor contact system 8 can both contact the force-receiving block 23 and apply a pushing force to the force-receiving block 23, causing the locking member 2 to rotate. During the rotation of the locking member 2, the output end of the angle contactor contact system 7 or the star contactor contact system 8 can first slide along the first inclined surface 231, and then slide onto the second inclined surface 232.

[0030] Please see Figure 1-3 , Figure 8 and Figure 10 The assembly cavity 11 has a groove 12 on its bottom inner wall, and the locking member 2 has a protrusion 24 on its bottom. A spring 5 is located between the groove 12 and the protrusion 24. One end of the spring 5 is placed in the groove 12, and the other end is sleeved on the protrusion 24. The locking member 2 is supported by the preload of the spring 5. When either locking member 2 rotates around its first end toward the interior of the assembly cavity 11, the protrusion 24 moves downward and compresses the spring 5, allowing the spring 5 to store elastic potential energy. When the output end of the angle contactor contact system 7 or the star contactor contact system 8 no longer applies a pushing force to the force block 23, the spring 5 can release its elastic potential energy and extend, causing the locking member 2 to rotate in the opposite direction and reset. A stop 13 is provided on the top of the assembly housing 1, on the side of the two locking members 2 that is far apart from each other. The stop 13 can limit the rotation angle of the locking member 2. When the locking member 2 rotates in the opposite direction, the stop 13 can block the locking member 2, allowing the locking member 2 to stop in a non-working state.

[0031] Example 1

[0032] Please see Figure 1-5The present invention is placed on the third protrusion 61 on the switch base 6, and can be fixed together with the third protrusion 61 by the first connecting part 14 and the second connecting part 15 on the assembly shell 1. In this embodiment, the first connecting part 14 is a hollow cylinder, and the second connecting part 15 is a protruding plate. By using screws passing through the round holes in the hollow cylinder and the protruding plate, the assembly shell 1 can be firmly fastened to the third protrusion 61.

[0033] Please see Figure 1-7 The output end of the angle contactor contact system 7 is provided with a first protrusion 71, and the output end of the star contactor contact system 8 is provided with a second protrusion 81. The bottom of both the first protrusion 71 and the second protrusion 81 has a smooth arc surface. When the assembly housing 1 is installed together with the third protrusion 61, the first protrusion 71 and the second protrusion 81 are tangent to the first inclined surface 231 on the two force-bearing blocks 23, and at this time, both the star and angle contactors are in the open state.

[0034] Please see Figure 1-8 When the angle contactor contact system 7 is closed, the smooth arc at the bottom of the first protrusion 71 on the output end of the angle contactor contact system 7 is tangent to the first inclined surface 231 on the force block 23. As the first protrusion 71 moves downwards, it slides down along the first inclined surface 231 and, through the force block 23, drives the locking member 2 to rotate inwards, simultaneously compressing the compression spring 5. When the first protrusion 71 slides onto the second inclined surface 232 and becomes tangent to it, the locking member 2 stops rotating. If the first protrusion 71 continues to move downwards, the spring 5 provides a counterforce, and the second inclined surface 232 remains tangent to the first protrusion 71.

[0035] Please see Figure 1-8 At this time, the protrusion 22 on the locking member 2 corresponding to the lower part of the angle contactor contact system 7 enters the inner side of the recess 21 on the locking member 2 corresponding to the lower part of the star contactor contact system 8, and the locking member 2 corresponding to the lower part of the star contactor contact system 8 cannot rotate. If the star contactor contact system 8 is pressed at this time, the force block 23 on the locking member 2 corresponding to the lower part of the star contactor contact system 8 can prevent the second protrusion 81 from moving downward. Therefore, the star contactor contact system 8 cannot be pressed to the closed position, and the star starting circuit will not be connected. Therefore, when the angle contactor contact system 7 is closed, the star contactor contact system 8 cannot be closed. In case of control circuit failure or manual emergency start, it can avoid misoperation after start-up, and the star starting circuit and the angle starting circuit will not be connected at the same time, which can ensure that the power supply or motor is not burned out.

[0036] Please see Figure 1-10When the coil is energized and the star contactor contact system 8 closes, the smooth arc at the bottom of the second protrusion 81 on the star contactor contact system 8 is tangent to the first inclined surface 231 on the force-bearing block 23. As the second protrusion 81 moves downwards, the locking member 2 rotates inwards, simultaneously compressing the spring 5. When the second protrusion 81 slides onto and is tangent to the second inclined surface 232, the locking member 2 stops rotating. If the second protrusion 81 continues to move downwards, the spring 5 provides a counterforce, and the second inclined surface 232 remains tangent to the second protrusion 81.

[0037] Please see Figure 1-10 At this time, the protrusion 22 on the locking member 2 corresponding to the bottom of the star contactor contact system 8 enters the inner side of the recess 21 on the locking member 2 corresponding to the bottom of the angle contactor contact system 7, and the locking member 2 corresponding to the bottom of the angle contactor contact system 7 cannot rotate. If the angle contactor contact system 7 is energized at this time, and the electrical interlock of the switch fails, the angle contactor contact system 7 will try to move downward. The force block 23 on the locking member 2 corresponding to the bottom of the angle contactor contact system 7 can prevent the first protrusion 71 from moving downward. Therefore, the angle contactor contact system 7 cannot reach the closed position, and the angle starting circuit will not be connected. So when the star contactor contact system 8 is closed, the angle contactor contact system 7 cannot be closed.

[0038] Please see Figure 1-10 When the star start is complete, the coil of the star contactor contact system 8 is de-energized. The star contactor contact system 8 will open due to the force of the return spring, meaning it will move upwards. Until the second protrusion 81 on the output terminal of the star contactor contact system 8 is no longer tangent to the second inclined surface 232 on the force block 23, the locking member 2 is reset under the action of the spring 5. At this point, the angle contactor coil can be energized to complete the reduced-voltage starting of the motor.

[0039] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the ideas of this technical content. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this patent.

Claims

1. A mechanical interlock mechanism for an emergency start-up device, characterized in that, include: An assembly shell, wherein the interior of the assembly shell is provided with an assembly cavity, the assembly cavity penetrating the top sidewall of the assembly shell; Two locking components are provided inside the assembly cavity and have a mirror-symmetrical structure. The first end of the locking component is rotatably connected to the inner wall of the assembly cavity, and the second end of the locking component extends from the top of the assembly shell to the outside of the assembly shell. There is a gap between the second ends of the two locking components, and the length of the locking component is greater than half the length of the assembly shell.

2. The mechanical interlock mechanism of the emergency start device according to claim 1, characterized in that, The locking element has a ring-shaped structure, with a concave portion in the middle and a protruding portion above the concave portion. The concave portion and the protruding portion together form an S-shaped structure.

3. The mechanical interlock mechanism of the emergency start device according to claim 2, characterized in that, The first end of the locking member is fixedly provided with a first boss, and the inner wall of the assembly cavity is provided with a second boss. The first boss and the second boss are rotatably connected, and there is a gap between the locking member and the inner wall of the assembly cavity.

4. The mechanical interlock mechanism of the emergency start device according to claim 2, characterized in that, The second end of the locking member is provided with a force-bearing block, and both sides of the force-bearing block are provided with a first inclined surface. The top of the force-bearing block and located between the two first inclined surfaces are provided with a second inclined surface. The width of the force-bearing block is greater than the width of the locking member.

5. The mechanical interlock mechanism of the emergency start device according to claim 2, characterized in that, A spring is provided between the locking member and the inner wall of the assembly cavity. A protrusion is provided at the bottom of the locking member. A groove is provided on the bottom inner wall of the assembly cavity. The first end of the spring is fixedly connected to the protrusion, and the second end of the spring extends into the groove and is fixedly connected to the inner wall of the groove.

6. The mechanical interlock mechanism of the emergency start device according to claim 5, characterized in that, The top of the assembly housing is provided with a stop portion on the side of the two locking members that are far apart from each other. The inner wall of the assembly cavity is provided with a first connecting portion between the two recesses. The bottom of the outer wall of the assembly housing is provided with two second connecting portions.

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