Integrated auxiliary switch switching control device applicable to hydraulic disc spring operating mechanism

Abstract

The invention discloses an integrated auxiliary switch switching control device applicable to a hydraulic disc spring operating mechanism, belonging to the technical field of hydraulic disc spring operation. It includes an auxiliary switch, a bottom plate, a bracket, a connecting piece, a square shaft, a crank arm, a rocker, a connecting plate, and a rotating block. The bracket is installed on the connecting piece with a fully symmetric structure, the bottom plate is installed on the side wall of the bracket, and the auxiliary switch is installed on one side of the bottom plate. The invention designs a connecting piece with a fully symmetric structure, improves production and assembly efficiency, and reduces part costs; by designing an integrated auxiliary switch switching control device, it can meet the requirements of the auxiliary switch switching angle for the hydraulic disc spring operating mechanisms configured for the arc extinguishing chamber strokes of different circuit breakers with voltage levels of 252 to 550V, greatly improving the versatility and adaptability of the device; by matching the triggering mode of the auxiliary contact and the speed of the triggering point with the piston rod, the action accuracy of the auxiliary contact is effectively guaranteed, and the overall performance of the hydraulic disc spring operating mechanism is improved.

Description

Technical Field

[0001] The present invention relates to an integrated auxiliary switch switching control device applicable to a hydraulic disc spring operating mechanism, and belongs to the technical field of hydraulic disc spring operation technology. Background Art

[0002] The hydraulic disc spring operating mechanism is an important core component of ultra-high voltage and extra-high voltage circuit breakers. Its working performance and quality play an extremely important role in the working performance and reliability of the circuit breaker. The hydraulic disc spring operating mechanism utilizes the principle of incompressibility of liquids, uses hydraulic oil as the transmission medium, sends high-pressure oil into both sides of the working cylinder to realize the opening and closing actions of the circuit breaker, and at the same time drives the auxiliary switch switching control device by the piston rod to realize the switching of the opening and closing secondary circuits and feedback auxiliary signals to judge the state of the mechanism, with the characteristics of large output power, small time delay, fast response, good steady-state characteristics, high reliability, and simple maintenance.

[0003] At present, the auxiliary switch switching control device used in the market and the hydraulic disc spring mechanism composed of it are already mature technologies. In particular, the hydraulic disc spring mechanisms produced by domestic manufacturers and the auxiliary switch switching control devices used by them directly quote or copy the structural design form of the foreign ABB hydraulic disc spring mechanism without major design changes. The rest are auxiliary switch switching control devices used in traditional hydraulic mechanisms.

[0004] The publication number CN202067688U discloses a high-voltage circuit breaker, which protects the transmission connection mechanism between the crank arm for driving the opening and closing actions of the high-voltage circuit breaker and the rotating shaft of the auxiliary switch.

[0005] The publication number CN205723316U discloses a hydraulic spring operating mechanism, which protects the overall structure of the HMB and the structure of the corresponding auxiliary switch switching control device.

[0006] The publication number CN207925388U discloses an auxiliary switch linkage structure that can be adjusted at a small angle, which protects the auxiliary switch body and the spline connection structure connecting to the crank arm on the operating mechanism of the high-voltage circuit breaker.

[0007] The currently common structural composition form of the auxiliary switch switching control device (as shown in Figure 1 ) and the hydraulic disc spring mechanism is that the power element part of the hydraulic mechanism is connected by bolts according to a certain positional angle relationship and special-shaped connecting parts. The auxiliary switch and some transmission parts use special-shaped connecting parts (such as Figure 2For assembly support as shown in the figure, the piston rod of the hydraulic disc spring mechanism drives the rocker arm, spline shaft, crank arm, connecting plate and connecting block through the driving component to drive the auxiliary switch to switch. The command signal and the auxiliary signal are both led out by the auxiliary switch. The principle is that the piston rod of the mechanism drives the corresponding transmission components during opening and closing operations, prompting the auxiliary switch to switch between two positions, so as to achieve the functions of controlling the connection and disconnection of the secondary circuit of the opening and closing commands and feedbacking the auxiliary signal.

[0008] 1) When the existing hydraulic disc spring mechanism is adapted to its auxiliary switch switching control device, the structure and adaptation ability of the auxiliary switch switching device are single. It can only be used with the power elements of the hydraulic disc spring mechanism with specific strokes and voltage levels. The later expansion universality is poor, and it cannot meet the connection and auxiliary switching angle requirements of the variable-stroke hydraulic disc spring mechanism.

[0009] 2) When the existing hydraulic disc spring mechanism is adapted to its auxiliary switch switching control device, the rotating shaft of the auxiliary switch is pushed by the externally transmitted thrust to prompt the contacts to connect and disconnect. According to the production and use situation, the auxiliary contacts have obvious bouncing and intermittency, which affects the stability of the auxiliary contact action and the acquisition of the auxiliary signal, and cannot meet the use requirements of the auxiliary contacts in the application of phase-selection closing of the circuit breaker.

[0010] In view of the above defects, it is necessary to design an integrated auxiliary switch switching control device applicable to the hydraulic disc spring operating mechanism. Summary of the Invention

[0011] In view of the technical defects mentioned in the above background art, the present invention provides an integrated auxiliary switch switching control device applicable to the hydraulic disc spring operating mechanism. The present invention conducts an integrated design on the auxiliary switch switching control device used in the hydraulic disc spring mechanism, which can meet the requirements of the power elements and connecting parts of the hydraulic disc spring mechanism for indefinite-angle assembly and the requirements of the auxiliary switch switching angle for the variable-stroke hydraulic disc spring mechanism with a voltage level of 252-550V, and can be adapted to different arc-chamber stroke requirements. At the same time, the connection and disconnection method of the auxiliary contacts is changed from push-trigger to pull-trigger, and the position of the trigger point is matched in the area where the piston rod speed of the hydraulic disc spring mechanism is relatively low, which can effectively reduce the bouncing and intermittency of the contacts and improve the accuracy and reliability of the auxiliary contact action. The present invention has strong universality and adaptability and high reliability, and can greatly improve the overall performance of the hydraulic disc spring mechanism.

[0012] The specific technical solution is as follows: An integrated auxiliary switch switching control device applicable to the hydraulic disc spring operating mechanism includes an auxiliary switch, a bottom plate, a bracket, a connecting piece, a square shaft, a crank arm, a rocker arm, a connecting plate, and a rotating block. The bracket is installed on the connecting piece with a fully symmetric structure, the bottom plate is installed on the side wall of the bracket, and the auxiliary switch is installed on one side of the bottom plate;

[0013] The connecting piece is installed on the power element of the hydraulic disc spring operating mechanism, and a slider is fixedly connected to the piston rod of the hydraulic disc spring operating mechanism;

[0014] A support block is jointly installed on the bracket and the bottom plate. A square shaft is rotatably sleeved on the support block. One end of the crank arm and one end of the rocker are respectively fixed on the square shaft. A plurality of mounting holes are formed at one end of the connecting plate. The other end of the crank arm is rotatably connected to any one of the plurality of mounting holes on the connecting plate. The other end of the rocker is constrained in the movement groove on the slider;

[0015] One end of the rotating block is fixedly connected to the rotating shaft on the auxiliary switch, and the other end of the connecting plate is rotatably connected to the rotating block;

[0016] A metal sliding piece is arranged inside the auxiliary switch. The metal sliding piece is sleeved on the rotating shaft of the auxiliary switch. Auxiliary contacts are also arranged inside the auxiliary switch. The metal sliding piece rotates with the rotating shaft to make contact or disengagement actions with the auxiliary contacts, so that the auxiliary contacts reach the on and off states.

[0017] Preferably, the other end of the crank arm is rotatably connected to the connecting plate through a pin shaft.

[0018] Preferably, the connecting piece is installed on the power element of the hydraulic disc spring operating mechanism through bolts.

[0019] Preferably, the number of the mounting holes is three, namely hole a, hole b and hole c.

[0020] Preferably, a limiting hole is arranged at one end of the rocker, and a limiting block matching the limiting hole is installed in the movement groove on the slider.

[0021] Preferably, the connecting piece with a fully symmetric structure is a hollow cylinder, and two pairs of concave holes are formed on the cylinder wall. Mounting through holes are formed at the top and bottom of the cylinder, and the mounting through holes and the two pairs of concave holes are symmetrically arranged on the cylinder.

[0022] The beneficial effects of the present invention are as follows: by designing the casting connecting piece of the hydraulic disc spring operating mechanism with a fully symmetric structure, the production and assembly efficiency are improved, and the part cost is reduced;

[0023] Through the integrated design of the auxiliary switch switching control device, the requirements for the switching angle of the auxiliary switch of the hydraulic disc spring operating mechanism matched with the arc extinguishing chamber stroke of different circuit breakers with voltage levels of 252-550V can be met, and the versatility and adaptability of the device are greatly improved;

[0024] Through the optimization design of the triggering method of the auxiliary contact and the speed matching between the triggering point and the piston rod of the hydraulic disc spring mechanism, the action accuracy of the auxiliary contact is effectively guaranteed, and the overall performance of the hydraulic disc spring operating mechanism is improved. Description of the Drawings

[0025] Figure 1 Fig. is a schematic structural diagram of an auxiliary switch switching control device in the prior art;

[0026] Figure 2 Fig. is a schematic structural diagram of a special-shaped connecting piece in the prior art;

[0027] Figure 3 Fig. is a schematic overall structural diagram of the present invention excluding the hydraulic disc spring operating mechanism;

[0028] Figure 4 Fig. is a schematic diagram of the connecting piece with a fully symmetric structure and its assembled state in the present invention;

[0029] Figure 5 Fig. is a schematic diagram of the state of the present invention in adapting the auxiliary switch switching control with variable stroke;

[0030] Figure 6 Fig. is a schematic diagram of the matching between the triggering of the auxiliary contact and the movement speed of the hydraulic disc spring mechanism in the present invention;

[0031] Figure 7 Fig. is a schematic diagram of the matching between the triggering of the auxiliary contact and the movement speed of the hydraulic disc spring mechanism in the present invention;

[0032] Figure 8 Fig. is a statistical chart of the closing time of the push-triggered auxiliary contact in the prior art (results of 150 operation tests);

[0033] Figure 9 Fig. is a statistical chart of the closing time of the pull-triggered auxiliary contact in the present invention (results of 150 operation tests);

[0034] In the figures: connecting piece 1, slider 2, piston rod 3, square shaft 4, rocker 5, crank arm 6, bracket 7, pin shaft 8, connecting plate 9, rotating block 10, auxiliary switch 11, bottom plate 12, support block 13, limit hole 14. Detailed Embodiments

[0035] In order to make it easy to understand the technical means, creative features, achieved purposes and effects of the present invention, the present invention will be further described below with reference to specific drawings and embodiments.

[0036] As Figures 5-9As shown in the figure, an integrated auxiliary switch switching control device applicable to a hydraulic disc spring operating mechanism includes an auxiliary switch 11, a bottom plate 12, a bracket 7, a connecting piece 1, a square shaft 4, a crank arm 6, a rocker 5, a connecting plate 9, and a rotating block 10. The bracket 7 is installed on the connecting piece 1 with a fully symmetric structure, the bottom plate 12 is installed on the side wall of the bracket 7, and the auxiliary switch 11 is installed on one side of the bottom plate 12;

[0037] The connecting piece 1 is installed on the power element of the hydraulic disc spring operating mechanism. A slider 2 is fixedly connected to the piston rod 3 of the hydraulic disc spring operating mechanism;

[0038] A support block 13 is jointly installed on the bracket 7 and the bottom plate 12. The square shaft 4 is rotatably sleeved on the support block 13. One end of the crank arm 6 and one end of the rocker 5 are respectively fixed on the square shaft 4. A plurality of mounting holes are provided at one end of the connecting plate 9. The other end of the crank arm 6 is rotatably connected to any one of the plurality of mounting holes on the connecting plate 9. The other end of the rocker 5 is constrained in the movement groove on the slider 2;

[0039] One end of the rotating block 10 is fixedly connected to the rotating shaft on the auxiliary switch 11, and the other end of the connecting plate 9 is rotatably connected to the rotating block 10;

[0040] Inside the auxiliary switch, there is a metal sliding piece sleeved on the rotating shaft of the auxiliary switch. Inside the auxiliary switch, there are also auxiliary contacts. The metal sliding piece rotates with the rotating shaft to make contact or disengagement actions with the auxiliary contacts, so that the auxiliary contacts reach the on and off states.

[0041] The connecting piece 1 is installed on the power element of the hydraulic disc spring operating mechanism through bolts.

[0042] It should be noted that the connecting piece 1 is assembled at an indefinite angle. The connecting piece used in the current hydraulic disc spring operating mechanism is optimized. The cast connecting piece is changed from a special-shaped structure to a fully symmetric structure, making the connecting piece 1 have higher strength and versatility. When connecting with the power element part of the hydraulic disc spring operating mechanism, there is no need to confirm the installation angle, the bolt passability is strong, the docking is simple, and it does not have any impact on the assembly position of the subsequent parts. To a certain extent, it has the function of "anti-fooling" in assembly, improves the assembly efficiency, and reduces the casting cost.

[0043] The other end of the crank arm 6 is rotatably connected to the connecting plate 9 through a pin shaft 8.

[0044] The number of mounting holes is three, namely hole a, hole b, and hole c.

[0045] It should be noted that the switching angle requirements of the hydraulic disc spring operating mechanism with different strokes for the auxiliary switch switching control device are integrated. While ensuring that the switching angles of the auxiliary switch 11 are consistent, the dimensions of the transmission components such as the rocker 5, the crank arm 6, the connecting plate 9, and the connecting block 10 are normalized through the graphical method. Finally, the dimensional requirements are integrated into the two connecting structural parts of the crank arm 6 and the connecting plate 9, and corresponding mounting holes are designed. For example, Figure 3 , when the auxiliary switching angle of stroke A is required, only the a holes on the crank arm 6 and the connecting plate 9 need to be connected for use, which can ensure the switching angle requirements of the auxiliary switch device. When the stroke of the mechanism is B or C, no parts need to be replaced. Only by adjusting the connecting holes to b or c can the usage requirements be met. This structure can ensure the universality and adaptability of the parts and the entire auxiliary switch switching control device to the greatest extent. For the switching angle requirements of the hydraulic disc spring operating mechanism with variable strokes, the same set of auxiliary switch switching control devices can be used to meet the usage and functional requirements.

[0046] A limiting hole 14 is provided at one end of the rocker 5, and a limiting block matching the limiting hole 14 is installed in the movement groove on the slider 2.

[0047] It should be noted that the contact triggering of the auxiliary switch 11 and its movement matching with the piston rod 3 on the hydraulic disc spring operating mechanism. Currently, in the closing operation of the hydraulic disc spring operating mechanism and its used auxiliary switch switching device, the on and off modes of the auxiliary contacts are push-triggered. According to the test records, when the normally open contact changes from the off state to the on state, as shown in the appendix Figure 8 According to the test statistics, if it is push-triggered, the signals of the contacts often show bouncing and intermittent phenomena. The on-time discreteness of the auxiliary contacts is relatively large, and the action time is unstable, with a fluctuation range within 2 ms. At the same time, the triggering of the auxiliary contacts fails to match well with the movement speed of the piston rod 3 on the hydraulic disc spring operating mechanism.

[0048] In this device, the triggering mode of the auxiliary contacts is changed from push to pull. The overall action of the on-time of the auxiliary contacts is relatively stable, and the fluctuation range is within 1 ms (as shown in the appendix Figure 9 ). At the same time, according to the switching angle of the auxiliary switch, the on and off positions of the auxiliary contacts are matched in the area where the speed of the piston rod 3 on the hydraulic disc spring operating mechanism is relatively low. This area is generally set at the first 0 - 15 mm stroke of the piston rod during closing startup and the first 0 - 20 mm before closing in place. This is determined by the buffering characteristics of the hydraulic disc spring operating mechanism and the front and rear time interval positions of the auxiliary contact action relative to the main contact. Through position matching, the bouncing and intermittent situations generated during the action of the auxiliary contacts can be effectively reduced, and the accuracy and reliability of the auxiliary contacts can be improved.

[0049] The connecting member 1 with a fully symmetric structure is a hollow cylinder, and two pairs of concave holes are provided on the cylinder wall. Installation through holes are provided at the top and bottom of the cylinder, and the installation through holes and the two pairs of concave holes are symmetrically arranged on the cylinder.

[0050] Working principle: When the hydraulic disc spring operating mechanism receives a closing command for closing operation, the piston rod 3 drives the slider 2 to move. The rocker 5 swings upward with the slider 2 as the pivot around the square shaft 4, driving the square shaft 4 to rotate. The square shaft 4 drives the toggle arm 6 to swing, the toggle arm 6 drives the connecting plate 9 to swing, and the connecting plate 9 drives the rotating block 10 to rotate around the axis of the auxiliary switch 11, prompting the auxiliary switch to switch angles.

[0051] When the hydraulic disc spring mechanism performs a tripping operation in the closed position, the slider 2 drives the rocker 5 to swing downward, and then the rocker 5 drives the entire transmission system such as the square shaft 4, toggle arm 6, pin shaft 8, connecting plate 9, connecting block 10, and auxiliary switch 11 to perform the auxiliary switch switching for the tripping operation.

[0052] When the mechanism has a stroke requirement, only the corresponding mounting holes (hole a or hole b or hole c) on the toggle arm 6 and the connecting plate 9 need to be connected with the pin shaft 8, and the requirement for the switching angle of the auxiliary switch of the variable-stroke hydraulic disc spring mechanism can be achieved.

[0053] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated auxiliary switch switching control device applicable to a hydraulic disc spring operating mechanism, characterized in that: It includes an auxiliary switch, a bottom plate, a bracket, a connecting piece, a square shaft, a crank arm, a rocker, a connecting plate, and a rotating block. The bracket is installed on the connecting piece with a fully symmetric structure, the bottom plate is installed on the side wall of the bracket, and the auxiliary switch is installed on one side of the bottom plate; The connecting piece is installed on the power element of the hydraulic disc spring operating mechanism, and a slider is fixedly connected to the piston rod of the hydraulic disc spring operating mechanism; A support block is jointly installed on the bracket and the bottom plate. The square shaft is rotatably sleeved on the support block. One end of the crank arm and one end of the rocker are respectively fixed on the square shaft. A plurality of mounting holes are formed at one end of the connecting plate. The other end of the crank arm is rotatably connected to any one of the plurality of mounting holes on the connecting plate, and the other end of the rocker is constrained in the movement groove on the slider; One end of the rotating block is fixedly connected to the rotating shaft on the auxiliary switch, and the other end of the connecting plate is rotatably connected to the rotating block; A metal sliding piece is provided inside the auxiliary switch. The metal sliding piece is sleeved on the rotating shaft of the auxiliary switch. An auxiliary contact is also provided inside the auxiliary switch. The metal sliding piece rotates with the rotating shaft to make contact or disengagement with the auxiliary contact, so that the auxiliary contact reaches the on and off states; A limiting hole is provided at one end of the rocker, and a limiting block matching the limiting hole is installed in the movement groove on the slider; The connecting piece with a fully symmetric structure is a hollow cylinder, and two pairs of concave holes are formed on the cylinder wall. Mounting through holes are formed at the top and bottom of the cylinder, and the mounting through holes and the two pairs of concave holes are symmetrically arranged on the cylinder.

2. The integrated auxiliary switch switching control device applicable to the hydraulic disc spring operating mechanism according to claim 1, characterized in that: The other end of the crank arm is rotatably connected to the connecting plate through a pin shaft.

3. The integrated auxiliary switch switching control device applicable to the hydraulic disc spring operating mechanism according to claim 1, characterized in that: The connecting piece is installed on the power element of the hydraulic disc spring operating mechanism through bolts.

4. The integrated auxiliary switch switching control device applicable to a hydraulic disc spring operating mechanism according to claim 1, wherein: The number of the mounting holes is three, namely hole a, hole b, and hole c.

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