Control and protection mechanism for operating mechanisms of switchgears

Abstract

The application provides a kind of control and protection operating mechanism of switch electric appliance, comprising: overload cam and overload push rod, overload push rod is equipped with the cooperation block being cooperated with driving block, cooperation block has the first cooperation part and the second cooperation part being respectively arranged adjacent and away from the rotation center of overload cam, in the process of re-catch, the second cooperation part is contacted with driving block prior to the first cooperation part.Ingenious on the basis of the first cooperation part, the second cooperation part is added, in the process of re-catch, overload cam rotates clockwise, driving block is contacted with the second cooperation part first, and then the first cooperation part is contacted after driving overload push rod moves a certain distance, so as to continue to drive overload push rod to move, compared with prior art, the re-catch stroke of overload push rod is increased, and the overall length of overload push rod remains unchanged, so that the catch amount is not affected, avoiding the occurrence of slip catch, the qualified rate of re-catch / reset is greatly improved, and the characteristics of product are greatly optimized.

Description

Technical Field

[0001] This invention relates to the field of control and protection switching devices for low-voltage electrical appliances, and specifically to an operating mechanism for control and protection switching devices. Background Technology

[0002] "Control and Protective Switching Devices" (or control protectors) are a new type of product in low-voltage electrical appliances. Their product category code is "CPS," which is an abbreviation for "Control and Protective Switching Device." CPS can achieve integrated, internally coordinated control and protection functions in a single-structure product, and can replace many traditional discrete components such as circuit breakers (fuses), contactors, overload (or overcurrent, phase loss) protection relays, starters, and isolators.

[0003] The operating mechanisms of existing control and protection switchgear, such as Figure 11 and 12 As shown, it mainly includes a center cam 01, an overload cam 02, a first stop 03, an overload push rod 04, a trip unit 06, and a fault push rod 08. The tripping process of the operating mechanism is as follows: Under normal conditions, the first stop 03 engages with the overload cam 02. When the trip unit 06 detects that the voltage, current and other parameters in the circuit exceed the set value, it will issue a tripping signal. The fault push rod 08 of the trip unit 06 moves forward, driving the overload push rod 04 to overcome the spring force of the first stop and the friction during its movement, thereby causing the first stop 03 to rotate counterclockwise. As the rotation angle of the first stop 03 increases, the engagement between the first stop 03 and the overload cam 02 continuously decreases. When the engagement is 0 (also known as "over-dead point"), the overload cam 02 is moved counterclockwise by the tension of the tripping spring on the overload cam 02. During the movement of the overload cam 02, the center cam 01 is further driven to move counterclockwise. Then, through a series of tripping linkages of the operating mechanism, the main circuit is cut off. After the professionals troubleshoot the circuit fault, they need to perform a re-clamping operation by rotating the handle counterclockwise. This is to restore the central cam 01, overload cam 02, overload push rod 04, trip unit 06, and fault push rod 08 of the operating mechanism to their pre-trip energy storage positions. The re-clamping process is as follows: The handle drives the central cam 01 to rotate counterclockwise. The central cam 01 drives the overload cam 02 to rotate clockwise through the mating surface. After the overload cam 02 returns to the point where the tripping amount is 0 (passing the dead point), the first stop 03 rotates clockwise under the elastic force of the first stop spring. At the same time, the tripping amount is restored to the maximum value, and the operating mechanism returns to the energy storage state. The overload cam 02 continues to move, driving the overload push rod 04 backward through the first mating part 07 on the drive block 05 and the overload push rod 04, so that the trip unit 06 and fault push rod 08 return to the energy storage state.

[0004] In actual production, due to the influence of various interrelated dimensional errors in the machining of parts, the cumulative tolerance of the mating point between the fault push rod 08 and the overload push rod 04 of the trip unit is very large. This results in a large deviation between the required re-clamping stroke of the overload push rod 04 and the pre-design (usually manifested as a smaller re-clamping stroke of the overload push rod, which cannot fully drive the fault push rod to restore it to the energy storage state). This leads to a low batch pass rate, resulting in a large amount of rework for this verification process, and even batch scrapping. To solve the above problems, the inventors thought of increasing the length of the overload push rod 04 to increase the re-clamping stroke. However, if the overload push rod 04 is too long, it will reduce the tripping distance between the overload push rod 04 and the first stop 03, thereby reducing the amount of engagement between the first stop 03 and the overload cam 02 when the first stop 03 trips. This makes it easy for external factors such as vibration to cause slippage (i.e., the overload cam 02 and the first stop 03 trip), resulting in the main circuit not being cut off under fault conditions. Therefore, how to increase the re-clamping stroke of the overload push rod 04 without reducing the clamping amount between the overload cam 02 and the first stop 03 is a technical problem that urgently needs to be solved in this industry. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the overload push rod reduces the amount of clamping while increasing the re-clamping stroke, resulting in slippage, thereby providing an operating mechanism for controlling and protecting switching electrical appliances that does not reduce the amount of clamping while increasing the re-clamping stroke.

[0006] Therefore, the present invention provides an operating mechanism for controlling and protecting a switchgear, comprising an overload cam, a first stop, and an overload push rod. Both the overload cam and the first stop are rotatably mounted on the switch body, having a latching engagement state and a disengaged state driven by the overload push rod. The overload cam is provided with a drive block that drives the overload push rod to reset upon re-clamping. The overload push rod is slidably mounted on the switch body and has a mating block opposite to and driven by the drive block. The mating block has a first mating portion adjacent to the rotation center of the overload cam and a second mating portion away from the rotation center of the overload cam. During re-clamping, the second mating portion contacts the drive block before the first mating portion.

[0007] The contact surface between the second mating part and the driving block is a horizontal plane and flush with the top surface of the first mating part.

[0008] The width of the mating block 6 is 5±0.2mm.

[0009] The contact surface between the first mating part and the driving block is an arc surface.

[0010] The overload push rod is positioned opposite to the fault push rod of the trip unit and is formed with a buffer structure that can elastically deform along its sliding direction.

[0011] The buffer structure includes at least one opening groove formed on the overload push rod, the opening of the opening groove being arranged facing upward or downward.

[0012] There are multiple opening slots, and the opening directions of two adjacent opening slots are opposite.

[0013] The bottom surface of the overload push rod is provided with a protrusion that can slide in contact with the switch body.

[0014] The contact surface between the bump and the switch body is an arc surface.

[0015] The overload push rod is slidably connected to the switch body via a slide rail structure. The slide rail structure includes a slide groove on the switch body and a slider on the overload push rod that is adapted to and connected to the slide groove.

[0016] The slider is provided with a limiting block on the side away from the overload push rod that can abut against the bottom surface of the switch body. The slide groove includes a first section and a second section connected in sequence. The size of the first section is larger than the size of the slider and smaller than the size of the limiting block. The size of the second section is larger than the size of the limiting block.

[0017] The technical solution of this invention has the following advantages:

[0018] 1. The operating mechanism for controlling and protecting switching electrical appliances provided by this invention ingeniously adds a second mating part to the original first mating part. During the re-clamping process, the overload cam rotates clockwise, and the drive block first contacts the second mating part, driving the overload push rod to move a certain distance before contacting the first mating part again, thereby continuing to drive the overload push rod to move. Compared with the prior art where the drive block only drives the overload push rod to move through the first mating part, this increases the re-clamping stroke of the overload push rod. Since the overall length of the overload push rod remains unchanged, it does not affect the clamping amount between the overload cam and the first stop, avoiding slippage, improving product reliability, and significantly increasing the re-clamping / reset pass rate, thus greatly optimizing product characteristics.

[0019] 2. The operating mechanism for controlling and protecting switching electrical appliances provided by the present invention has a horizontal contact surface between the second mating part and the driving block, which is flush with the top surface of the first mating part. It should be noted that in the locking state, the mating block and the driving block need to maintain a certain distance. If the distance is too small, the mating block may drive the overload cam to rotate counterclockwise due to vibration and other factors, causing it to disengage from the first stop, which increases the risk of the slider. The above-mentioned structural setting of the second mating part makes the distance between the second mating part and the driving block greater than the distance between the first mating part and the driving block in the locking state, thereby improving the reliability of the product.

[0020] 3. The operating mechanism for controlling and protecting switching electrical appliances provided by the present invention has an overload push rod and a fault push rod of the trip unit arranged opposite to each other, and is formed with a buffer structure that can elastically deform along its sliding direction, thereby avoiding direct hard contact between the overload push rod and the fault push rod, making it less prone to breakage and extending its service life.

[0021] 4. The operating mechanism for controlling and protecting switching electrical appliances provided by the present invention includes a buffer structure comprising multiple open slots formed on the overload push rod, and the opening directions of two adjacent open slots are opposite, thus forming a wave line with crests and troughs, thereby increasing the amount of elastic deformation.

[0022] 5. The operating mechanism for controlling and protecting switching electrical appliances provided by the present invention has a protrusion on the bottom surface of the overload push rod that can slide in contact with the switch body, thereby reducing the contact area between the overload push rod and the switch body, reducing wear, and extending service life. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the operating mechanism for the control and protection switching device of the present invention;

[0025] Figure 2 A three-dimensional view of the operating mechanism for controlling and protecting switching electrical appliances;

[0026] Figure 3 This is an assembly diagram of the overload cam, the first stop, and the push rod.

[0027] Figure 4 for Figure 3 A schematic diagram of the exploded structure;

[0028] Figure 5A 3D view of the overload cam;

[0029] Figure 6 This is the first perspective view of the overload push rod;

[0030] Figure 7 This is a second perspective view of the overload push rod;

[0031] Figure 8 This is a top view of the overload push rod;

[0032] Figure 9 This is a side view of the overload push rod;

[0033] Figure 10 A comparison diagram of the overload push rod of the present application with the prior art;

[0034] Figure 11 This is a schematic diagram of the operating mechanism for controlling and protecting switching electrical appliances in the prior art.

[0035] Figure 12 This is a schematic diagram of the assembly of the overload cam, the first stop, and the push rod in the prior art.

[0036] Explanation of reference numerals in the attached drawings: 01, center cam; 02, overload cam; 03, first stop; 04, overload push rod; 05, drive block; 06, trip unit; 07, first mating part; 08, fault push rod;

[0037] 1. Switch body; 2. Overload cam; 3. First stop; 4. Overload push rod; 5. Drive block; 6. Mating block; 7. First mating part; 8. Second mating part; 9. Opening groove; 10. Protrusion; 11. Slide groove; 12. Slider; 13. Limit block; 14. First section; 15. Second section; 16. First latching block; 17. Second latching block. Detailed Implementation

[0038] The technical solution of the present invention 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 the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example

[0043] This embodiment provides an operating mechanism for controlling and protecting switching electrical appliances, such as... Figure 1-3 As shown, it includes an overload cam 2, a first stop 3, and an overload push rod 4.

[0044] Both the overload cam 2 and the first stop 3 are rotatably mounted on the switch body 1, having a snap-fit ​​engagement state and a tripped state under the drive of the overload push rod 4, such as... Figure 2 and 4 As shown, the overload cam 2 is equipped with a drive block 5 that drives the overload push rod 4 to reset upon re-clamping. In such a way... Figure 2 In the shown locking state, the first locking block 16 of the overload cam 2 engages with the second locking block on the first stop 3. In this embodiment, as shown in the figure, the drive block 5 has a drive surface extending radially from the center of the overload cam 2, and the drive surface is adapted to drive the overload push rod 4 to re-lock.

[0045] The overload push rod 4 is slidably mounted on the switch body 1. It has a mating block 6 that is opposite to and driven by the drive block 5, a buffer structure, and a slide rail structure.

[0046] like Figure 6-9As shown, the mating block 6 has a first mating portion 7 located near the rotation center of the overload cam 2, and a second mating portion 8 located away from the rotation center of the overload cam 2. During the re-clamping process, the second mating portion 8 contacts the driving block 5 before the first mating portion 7. The contact surface between the second mating portion 8 and the driving block 5 is a horizontal plane and flush with the top surface of the first mating portion 7, while the contact surface between the first mating portion 7 and the driving block 5 is an arc surface. Figure 10 As shown, Figure 10 The left side of the diagram shows the cooperation between the overload push rod 4 and the drive block 5 in the prior art, while the right side shows the cooperation between the overload push rod 4 and the drive block 5 in this application. Here, b1 is the initial position of the drive block 05 / 5. After rotating by an angle 'a', the drive block 05 / 5 moves to position b2. Comparing the left and right diagrams, it can be seen that in the right diagram, the drive block 5 contacts the second mating part 8 after rotating by an angle 'a', which can drive the overload push rod 4 to reset (re-lock). However, in the left diagram, the drive block 05, after rotating by the same angle 'a', does not contact the first mating part 07. That is, the re-locking stroke of the overload push rod 4 in the right diagram is a distance L longer than that in the left diagram, thus increasing its re-locking stroke while keeping the overall length of the overload push rod unchanged. In this embodiment, the width D2 of the mating block 6 is 5 ± 0.2 mm. It should be noted that in the prior art, the width D1 of the first mating part 08 is 3 mm.

[0047] A buffer structure is provided at the end of the overload push rod 4 adjacent to the fault push rod of the trip unit. The buffer structure can elastically deform along the sliding direction of the overload push rod. In this embodiment, the buffer structure includes two opening slots 9 formed on the overload push rod 4, and the opening directions of the two opening slots 9 are arranged facing upward and downward, respectively.

[0048] As a possible implementation, the number of openings 9 can be one, two, three, or more.

[0049] The bottom surface of the overload push rod 4 is provided with a protrusion 10 that can slide in contact with the switch body 1. The contact surface between the protrusion 10 and the switch body 1 is an arc surface. The overload push rod 4 is slidably connected to the switch body 1 via a slide rail structure. The slide rail structure includes a slide groove 11 on the switch body 1 and a slider 12 on the overload push rod 4 that is adapted to and connected to the slide groove 11. The slider 12 has a limiting block 13 on the side away from the overload push rod 4 that can abut against the bottom surface of the switch body 1. The slide groove 11 includes a first segment 14 and a second segment 15 connected in sequence. The size of the first segment 14 is larger than the size of the slider 12 and smaller than the size of the limiting block 13. The size of the second segment 15 is larger than the size of the limiting block 13.

[0050] The operating mechanism for controlling and protecting switching electrical appliances provided by this invention cleverly adds a second mating part 8 to the original first mating part 7. During the re-clamping process, the overload cam 2 rotates clockwise, and the drive block 5 first contacts the second mating part 8, driving the overload push rod 4 to move a certain distance before contacting the first mating part 7, thereby continuing to drive the overload push rod 4 to move. Compared with the prior art where the drive block only drives the overload push rod through the first mating part, this increases the re-clamping stroke of the overload push rod 4. Since the overall length of the overload push rod 4 remains unchanged, it does not affect the clamping amount between the overload cam 2 and the first stop 3, avoiding slippage, improving product reliability, and significantly increasing the re-clamping / reset pass rate, thus greatly optimizing product characteristics.

[0051] 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 scope of protection of this invention.

Claims

1. An operating mechanism for controlling and protecting switching electrical appliances, characterized in that, include: The overload cam (2) and the first stop (3) are rotatably mounted on the switch body (1), and have a snap-fit ​​engagement state and a tripping state under the drive of the overload push rod (4). The overload cam (2) is provided with a drive block (5) that drives the overload push rod (4) to reset when it is re-engaged. An overload push rod (4) is slidably mounted on the switch body (1). It has a mating block (6) that is opposite to and driven by the drive block (5). The mating block (6) has a first mating part (7) located near the rotation center of the overload cam (2) and a second mating part (8) located away from the rotation center of the overload cam (2). During the re-clamping process, the second mating part (8) contacts the drive block (5) before the first mating part (7).

2. The operating mechanism for controlling and protecting switching electrical appliances according to claim 1, characterized in that, The contact surface between the second mating part (8) and the driving block (5) is a horizontal plane and is flush with the top surface of the first mating part (7).

3. The operating mechanism for controlling and protecting switching electrical appliances according to claim 1, characterized in that, The width of the mating block (6) is 5±0.2mm.

4. The operating mechanism for controlling and protecting switching electrical appliances according to claim 1 or 2, characterized in that, The contact surface between the first mating part (7) and the driving block (5) is an arc surface.

5. The operating mechanism for controlling and protecting switching electrical appliances according to claim 1, characterized in that, The overload push rod (4) is positioned opposite to the fault push rod of the trip unit and is formed with a buffer structure that can elastically deform along its sliding direction.

6. The operating mechanism for controlling and protecting switching electrical appliances according to claim 5, characterized in that, The buffer structure includes at least one open slot (9) formed on the overload push rod (4), and the opening direction of the open slot (9) is set to face upward or downward.

7. The operating mechanism for controlling and protecting switching electrical appliances according to claim 6, characterized in that, There are multiple opening slots (9), and the opening directions of two adjacent opening slots (9) are opposite.

8. The operating mechanism for controlling and protecting switching electrical appliances according to claim 1, characterized in that, The bottom surface of the overload push rod (4) is provided with a protrusion (10) that can slide in contact with the switch body (1).

9. The operating mechanism for controlling and protecting switching electrical appliances according to claim 1, characterized in that, The overload push rod (4) is slidably connected to the switch body (1) via a slide rail structure. The slide rail structure includes a slide groove (11) on the switch body (1) and a slider (12) on the overload push rod (4) that is adapted to and connected to the slide groove (11).

10. The operating mechanism for controlling and protecting switching electrical appliances according to claim 9, characterized in that, The slider (12) is provided with a limiting block (13) on the side away from the overload push rod (4) that can abut against the bottom surface of the switch body (1). The slide groove (11) includes a first section (14) and a second section (15) connected in sequence. The size of the first section (14) is larger than the size of the slider (12) and smaller than the size of the limiting block (13). The size of the second section (15) is larger than the size of the limiting block (13).

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