Mechanical life test device for operating mechanism

Abstract

The invention provides an operating mechanism mechanical life test device, the operating mechanism mechanical life test device comprises a shell, a static end assembly, a moving end assembly, a contact finger simulation assembly and an air compression counterforce simulation assembly, the contact finger simulation assembly is arranged in a sealing cavity and is configured to apply a holding force to the moving end assembly at a closing position; the moving end assembly is configured to be switched between a switching-on position and a switching-off position under the driving of the operating mechanism, at least part of the moving end assembly is located in the air compression counterforce simulation assembly, and the air compression counterforce simulation assembly is configured to apply air compression counterforce to the moving end assembly at the switching-off position. According to the operating mechanism mechanical life test device, through cooperation of the contact finger simulation assembly and the compressed air counterforce simulation assembly, the test working condition of the operating mechanism is close to the working condition of the operating mechanism on a circuit breaker, so that the operating mechanism mechanical life test does not need to use the circuit breaker, and the test cost is reduced.

Description

Technical Field

[0001] This application relates to the field of power testing technology, and in particular to a mechanical life testing device for operating mechanisms. Background Technology

[0002] Circuit breakers are critical protective devices in power systems. Their core function is to connect or disconnect circuits during normal operation and to quickly interrupt large currents to protect power grid equipment in the event of a short-circuit fault.

[0003] As the power actuator of the circuit breaker, the operating mechanism is responsible for providing the mechanical power required for opening and closing operations. To ensure the reliability of the operating mechanism, a rigorous mechanical life test must be conducted before the operating mechanism leaves the factory to verify its long-term stability and durability.

[0004] In existing technologies, the mechanical life test method for operating mechanisms requires connecting the operating mechanism to a complete circuit breaker (including the arc-extinguishing chamber) for testing. Since the arc-extinguishing chamber is prone to damage due to mechanical wear, arc erosion, or seal failure under frequent operation, the circuit breaker needs to be replaced or repaired frequently, resulting in high testing costs. Summary of the Invention

[0005] This application provides a mechanical life testing device for operating mechanisms to solve the problem of high testing costs caused by using circuit breakers to test the mechanical life of operating mechanisms.

[0006] This application provides a mechanical life testing device for an operating mechanism, comprising:

[0007] A housing having a sealed cavity inside;

[0008] A stationary end assembly, wherein the stationary end assembly is disposed within the sealed cavity;

[0009] A moving end assembly is disposed within the sealed cavity and is used to connect to the operating mechanism to be tested. The moving end assembly is configured to move within the sealed cavity under the drive of the operating mechanism to switch between a closed position connected to the stationary end assembly and an open position separated from the stationary end assembly.

[0010] A touch finger simulation component is disposed on the stationary end component and configured to apply a clamping force to the moving end component in the closed position.

[0011] A compressed air reaction force simulation component is disposed within the sealed cavity, at least a portion of the moving end component is located within the compressed air reaction force simulation component, and the compressed air reaction force simulation component is configured to apply a compressed air reaction force to the moving end component in the open position.

[0012] In one possible implementation, the stationary end assembly includes a stationary end seat and a stationary contact, the stationary end seat being disposed within the sealed cavity and the stationary contact being disposed on the stationary end seat;

[0013] The finger simulation component includes multiple fingers and multiple first elastic elements. The multiple fingers are arranged at circumferential intervals along the stationary end seat, and the multiple first elastic elements are respectively disposed between each finger and the stationary end seat.

[0014] In the closed position, the first elastic elements apply multiple radial clamping forces to the moving end assembly through the multiple contact points, and the multiple radial clamping forces form the clamping force.

[0015] In one possible implementation, each of the touch fingers has a guide slope at the end facing the moving end assembly;

[0016] As the moving end assembly moves toward the stationary end assembly, the guide ramp is used to guide the moving end assembly to radially press the finger.

[0017] In one possible implementation, the stationary end seat includes a body and a cover, the cover being fitted onto a portion of the body, an annular mounting groove being defined between the cover and the body, and a plurality of the contact fingers being slidably disposed in the mounting groove along the radial direction of the body;

[0018] One end of the first elastic element is connected to the corresponding finger, and the other end is connected to the bottom of the mounting groove.

[0019] In one possible implementation, the compressed air reaction force simulation component includes a cylinder and a pressure relief valve disposed within the cylinder.

[0020] The moving end assembly includes a rod and a moving end seat. The rod is located inside the cylinder, and the moving end seat is connected to the rod. The rod is used to connect with the operating mechanism. A pressure chamber is formed between the cylinder, the moving end seat, and the pressure relief valve.

[0021] When the valve is in the open position, the moving end seat compresses the gas in the pressure chamber. When the pressure in the pressure chamber is less than the preset pressure, the pressure relief valve is closed, and the gas in the pressure chamber applies the compressed air reaction force to the moving end seat. When the pressure in the pressure chamber is greater than or equal to the preset pressure, the pressure relief valve opens, and the gas flowing out of the pressure relief valve communicates with the sealing cavity through the inside of the rod.

[0022] In one possible implementation, the compressed air reaction force simulation component further includes a support cylinder located within the sealed cavity. One end of the support cylinder is connected to the housing, and the other end is connected to the cylinder body. The pressure relief valve is disposed between the cylinder body and the support cylinder.

[0023] A connecting cavity is formed between the pressure relief valve, the support cylinder, and the housing. When the pressure in the pressure cavity is greater than or equal to the preset pressure, the pressure relief valve connects the pressure cavity and the connecting cavity. The connecting cavity is connected to the sealing cavity through the inside of the rod.

[0024] And / or, in the closed position, the gas in the sealed cavity flows into the pressure chamber through the interior of the rod.

[0025] In one possible implementation, the pressure relief valve includes a valve seat, a first valve plate, a second valve plate, and a second elastic element;

[0026] The valve seat is disposed inside the cylinder, and the valve seat is provided with a plurality of first vent ports; the first valve plate and the second valve plate are spaced apart on the valve seat along the axial direction of the valve seat, the first valve plate is located between the first vent port and the second valve plate, a first vent gap is formed between the first valve plate and the valve seat, a second vent gap is formed between the second valve plate and the cylinder, an intermediate vent gap is formed between the first valve plate and the second valve plate, and the second elastic element is disposed between the second valve plate and the valve seat;

[0027] When the pressure in the pressure chamber is less than the preset pressure, the first valve plate moves toward the second valve plate to put the pressure relief valve in the closed state. When the pressure in the pressure chamber is greater than or equal to the preset pressure, the second valve plate moves toward the second elastic element and compresses the second elastic element to open the pressure relief valve. The pressure chamber is connected to the sealing chamber through the interior of the rod.

[0028] In one possible implementation, the moving end seat includes a sleeve, an end plate, and a third valve plate. The end plate is connected to the end of the sleeve away from the stationary end assembly. The rod passes through the end plate and the third valve plate. The end plate is provided with a second vent for communicating with the pressure chamber and the sealing chamber. The third valve plate is movably disposed inside the sleeve along the axial direction of the sleeve.

[0029] When the pressure in the pressure chamber is less than the preset pressure, the third valve plate is used to block the second vent; when the pressure in the pressure chamber is greater than or equal to the preset pressure, the third valve plate is used to open the second vent to connect the sealing chamber and the pressure chamber.

[0030] In one possible implementation, it also includes a connecting plate, a crank arm, and a drive shaft disposed within the sealed cavity;

[0031] One end of the connecting plate is connected to the rod body, the other end of the connecting plate is hinged to one end of the crank arm, the other end of the crank arm is connected to one end of the drive shaft, and the other end of the drive shaft extends out of the housing and is connected to the operating mechanism;

[0032] The operating mechanism drives the crank arm to rotate via the transmission shaft, thereby causing the connecting plate and the rod to move axially along the housing.

[0033] In one possible implementation, the system further includes an insulating element and a conductor. The insulating element is disposed between the housing and the stationary end assembly. The conductor is disposed on the housing and is insulated from the housing. One end of the conductor is electrically connected to the stationary end assembly, and the moving end assembly is electrically connected to the housing. In the closed position, the conductor and the housing form a test circuit.

[0034] The mechanical life testing device for operating mechanisms provided in this application simulates the clamping force applied by the contact finger to the moving end assembly when the moving and stationary end assemblies are in the closed position in a real circuit breaker arc-extinguishing chamber using a contact finger simulation component, thus providing a resistance load for the closing process of the operating mechanism. It also simulates the compressed air reaction force generated by the compressed gas in the moving contact of a real compressed air arc-extinguishing chamber in the open position using a compressed air reaction force simulation component, providing a resistance load for the opening process of the operating mechanism. The cooperation between the contact finger simulation component and the compressed air reaction force simulation component makes the test conditions of the operating mechanism close to its working conditions on a circuit breaker, eliminating the need for a circuit breaker in the mechanical life test of the operating mechanism, thereby reducing test costs. It also helps ensure the reliability of the mechanical life test results of the operating mechanism. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0036] Figure 1 This is a schematic diagram of the mechanical life testing device for the operating mechanism according to an embodiment of this application;

[0037] Figure 2 for Figure 1 A schematic diagram of the internal structure of the intermediate-drive component when it is in the closed position;

[0038] Figure 3 for Figure 1 A schematic diagram of the internal structure of the intermediate-actuator component when it is in the open position;

[0039] Figure 4 for Figure 1 Schematic diagram of the structure of the middle static end component;

[0040] Figure 5 for Figure 4 The left view in the middle;

[0041] Figure 6 for Figure 5 Sectional view along direction AA in the middle;

[0042] Figure 7 for Figure 4 Partial structural schematic diagram of the central static end seat;

[0043] Figure 8 for Figure 3 Schematic diagram of the medium-pressure gas reaction force simulation component and the moving end component;

[0044] Figure 9 for Figure 3 Schematic diagram of the structure of the mid-drive component;

[0045] Figure 10 for Figure 9 A schematic diagram of the structure with an added pressure relief valve;

[0046] Figure 11 for Figure 10 Schematic diagram of the pressure relief valve;

[0047] Figure 12 for Figure 3 Schematic diagram of the internal structure of the pressure relief valve;

[0048] Figure 13 for Figure 3 A schematic diagram of the internal structure of the mid-range power unit.

[0049] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments.

[0050] Explanation of reference numerals in the attached figures

[0051] 100 - Shell; 110 - Shell body; 120 - Cover; 130 - Crank arm shell; 140 - Sealing cavity; 150 - Insulating component; 160 - Insulating sleeve;

[0052] 200 - Stationary end assembly; 210 - Stationary end seat; 211 - Main body; 2111 - Base plate; 2112 - Side plate; 212 - Cover; 2121 - Second limiting ring; 213 - Mounting groove; 215 - First limiting ring; 220 - Stationary contact;

[0053] 300-Moving end assembly; 310-Moving end seat; 311-Sleeve; 312-End plate; 3121-Second vent; 313-Third valve plate; 320-Moving contact; 330-Rod body; 331-Ventilation channel; 332-Ventilation hole; 340-Sleeve; 350-Limiting sleeve;

[0054] 400 - Finger simulation component; 410 - Finger; 411 - Guide slope; 420 - First elastic element;

[0055] 500 - Compressed air reaction force simulation component; 510 - Cylinder body; 5111 - Guide ring; 512 - Support cylinder; 5121 - First limiting protrusion; 520 - Pressure relief valve; 521 - Valve seat; 5211 - Disc body; 5212 - Pipe body; 5213 - Mounting sleeve; 5214 - First vent; 5215 - Second limiting protrusion; 522 - First valve plate; 523 - Second valve plate; 524 - Second elastic element; 530 - Pressure chamber; 540 - Connecting chamber; 550 - First venting gap; 560 - Intermediate venting gap; 570 - Second venting gap;

[0056] 600-Connecting plate;

[0057] 700-crank arm;

[0058] 800-Drive shaft;

[0059] 900-conductor;

[0060] 1000 - Pressure testing component. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0064] The terms "first," "second," "third," "fourth," etc., used in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0065] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or components is not necessarily limited to those steps or components that are explicitly listed, but may include other steps or components that are not explicitly listed or that are inherent to those processes, methods, products, or apparatuses.

[0066] In existing technologies, when conducting mechanical life tests on the operating mechanism of a circuit breaker, the operating mechanism must be assembled as a whole with the circuit breaker, and actual opening and closing operations are used to simulate real working conditions. However, because the arc-extinguishing chamber of the circuit breaker is prone to damage due to mechanical wear, arc erosion, and seal failure under frequent operation, the circuit breaker needs to be frequently replaced or repaired during the test, thus increasing the test cost.

[0067] Therefore, this application provides a mechanical life testing device for operating mechanisms. The mechanical life testing device for operating mechanisms provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0068] like Figure 1 , Figure 2 and Figure 3As shown. This application provides a mechanical life testing device for an operating mechanism, including a housing 100, a stationary end assembly 200, a moving end assembly 300, a finger simulation assembly 400, and a compressed air reaction force simulation assembly 500.

[0069] The housing 100 has a sealed cavity 140, and the stationary end assembly 200 is disposed within the sealed cavity 140. The moving end assembly 300 is disposed within the sealed cavity 140 and is used to connect to the operating mechanism to be tested. The moving end assembly 300 is configured to move within the sealed cavity 140 under the drive of the operating mechanism to switch between a closed position connected to the stationary end assembly 200 and an open position separated from the stationary end assembly 200.

[0070] A contact finger simulation component 400 is disposed on the stationary end component 200 and is configured to apply a clamping force to the moving end component 300 in the closed position. A compressed air reaction force simulation component 500 is disposed within the sealing cavity 140, and at least a portion of the moving end component 300 is located within the compressed air reaction force simulation component 500. The compressed air reaction force simulation component 500 is configured to apply a compressed air reaction force to the moving end component 300 in the open position.

[0071] The mechanical life testing device for the operating mechanism in this embodiment simulates the clamping force exerted by the contact finger 410 on the moving end assembly 300 when the moving end assembly 300 and the stationary end assembly 200 are in the closed position in a real circuit breaker arc-extinguishing chamber using a contact finger simulation component 400, thus providing a resistance load for the closing process of the operating mechanism. Furthermore, the compressed air reaction force simulation component 500 simulates the compressed air reaction force generated by the moving contact 320 compressing gas when the moving contact 320 is in the open position in a real compressed air arc-extinguishing chamber, thus providing a resistance load for the opening process of the operating mechanism.

[0072] By combining the touch simulation component 400 and the compressed air reaction force simulation component 500, the test conditions of the operating mechanism are made close to its working conditions on a circuit breaker. This eliminates the need for a circuit breaker in the mechanical life test of the operating mechanism, thereby reducing test costs. It also helps ensure the reliability of the mechanical life test results of the operating mechanism.

[0073] It should be noted that, in this embodiment, the closing position specifically refers to the movement process of the moving end component 300 from a position just in contact with the stationary end component 200 to a position fully connected with the stationary end component 200. The opening process of the moving end component 300 refers to the movement process of the moving end component 300 from a position fully connected with the stationary end component 200 to a position where the moving end component 300 is completely disengaged from the stationary end component 200 and returns to its initial position.

[0074] like Figure 2As shown, the housing 100 includes a housing body 110, a cover 120, and a crank arm housing 130. The housing body 110 is cylindrical with openings at both ends. The cover 120 is connected to one end of the housing body 110 to seal one opening. The crank arm housing 130 is connected to the other end of the housing body 110 to communicate with the other opening. A sealing cavity 140 is formed between the housing body 110, the cover 120, and the crank arm housing 130.

[0075] In one possible implementation, such as Figures 3 to 6 As shown. The stationary end assembly 200 includes a stationary end seat 210 and a stationary contact 220. The stationary end seat 210 is disposed within the sealing cavity 140, and the stationary contact 220 is disposed on the stationary end seat 210. The contact finger simulation assembly 400 includes a plurality of contact fingers 410 and a plurality of first elastic elements 420. The plurality of contact fingers 410 are arranged at circumferential intervals along the stationary end seat 210, and the plurality of first elastic elements 420 are respectively disposed between each contact finger 410 and the stationary end seat 210. In the closed position, the plurality of first elastic elements 420 apply a plurality of radial clamping forces to the moving end assembly 300 through the plurality of contact fingers 410, and the plurality of radial clamping forces form a clamping force.

[0076] Here, by setting multiple first elastic elements 420 and multiple first contact fingers 410, multiple radial clamping forces form a clamping force, which is completely consistent with the working principle of the contact fingers 410 in the arc-extinguishing chamber of a real circuit breaker. This allows the contact finger assembly 400 to simulate the closing load of the operating mechanism more realistically, which helps to ensure the reliability of the test results.

[0077] like Figure 4 and Figure 6 As shown, the contact finger 410 extends axially along the stationary end seat 210. The stationary end seat 210 includes a main body 211 and a cover 212. The cover 212 is fitted onto a portion of the main body 211, and an annular mounting groove 213 is defined between the cover 212 and the main body 211. The plurality of contact fingers 410 are respectively slidably disposed in the mounting groove 213 along the radial direction of the main body 211. One end of the first elastic member 420 is correspondingly connected to the contact finger 410, and the other end is correspondingly connected to the bottom of the mounting groove 213.

[0078] The arrangement of the main body 211 and the cover 212 facilitates the installation of multiple contact fingers 410 and the first elastic element 420 within the mounting groove 213. The positioning of the first elastic element 420 allows it to apply radial compressive force to the contact fingers 410 and provides good force stability.

[0079] like Figure 6As shown, the main body 211 has a base plate 2111 at one end and a cylindrical side plate 2112. The base plate 2111 is disposed at one end of the side plate 2112, and the stationary contact 220 is inserted into the base plate 2111. To form the aforementioned mounting groove 213, a first limiting ring 215 located inside the side plate 2112 is provided on the base plate 2111.

[0080] like Figure 5 , Figure 6 and Figure 7 As shown, the cover 212 is fitted over the side plate 2112. Corresponding to the first limiting ring 215, a second limiting ring 2121 that folds inward is provided at the end of the cover 212 away from the bottom plate 2111. The aforementioned mounting groove 213 is formed between the first limiting ring 215, the bottom plate 2111, the side plate 2112, and the second limiting ring 2121. The first limiting ring 215 prevents the end of the touch finger 410 facing the bottom plate 2111 from dislodging from the mounting groove 213, and the second limiting ring 2121 prevents the other end of the touch finger 410 from dislodging from the mounting groove 213. This helps ensure the stability and reliability of the touch finger assembly 400 during use.

[0081] like Figure 6 As shown, two first elastic elements 420 are spaced apart between a contact finger 410 and the bottom of the mounting groove 213. This helps to improve the stability of the radial clamping force output by the contact finger 410. Additionally, two slots are spaced apart on the side of the contact finger 410 facing the bottom of the mounting groove 213. Corresponding to the slots, inserts are provided on the inner wall of the side plate 2112, each corresponding to a slot. The inserts are inserted into their respective slots, and the first elastic element 420 is a spring, located in the slot and sleeved around the insert.

[0082] The fit between the slot, the post, and the first elastic element 420 ensures that the first elastic element 420 is always compressed and deformed along the axis of the post, effectively preventing instability and abnormal wear of the contact finger 410 and the first elastic element 420, thereby extending the service life of the contact finger assembly 400.

[0083] In one possible implementation, such as Figure 4 and Figure 6 As shown, each finger 410 has a guide slope 411 at one end facing the moving end assembly 300. When the moving end assembly 300 moves toward the stationary end assembly 200, the guide slope 411 is used to guide the moving end assembly 300 to radially press the finger 410.

[0084] Here, the distance between the guide ramp 411 and the axis of the stationary end seat 210 gradually increases in the direction away from the base plate 2111. The cooperation of multiple guide ramps 411 not only facilitates the insertion of the moving end assembly 300 into the contact finger assembly 400 to connect with the stationary contact 220, but also facilitates the contact finger assembly 400 to form a clamping force on the moving end assembly 300. Specifically, the guide ramp 411 contacts the moving end assembly 300 when it moves to the just-closed position and guides the moving end assembly 300 into the multiple contact fingers 410.

[0085] In one possible implementation, such as Figure 3 and Figure 8 As shown, the compressed air reaction force simulation component 500 includes a cylinder 510 and a pressure relief valve 520, which is disposed inside the cylinder 510. The moving end component 300 includes a rod 330 and a moving end seat 310. The rod 330 is located inside the cylinder 510, and the moving end seat 310 is connected to the rod 330. The rod 330 is used to connect with the operating mechanism.

[0086] A pressure chamber 530 is formed between the cylinder 510, the moving end seat 310, and the pressure relief valve 520. In the open position, the moving end seat 310 compresses the gas in the pressure chamber 530. When the pressure in the pressure chamber 530 is less than a preset pressure, the pressure relief valve 520 is closed. The gas in the pressure chamber 530 exerts a compressed air reaction force on the moving end seat 310. When the pressure in the pressure chamber 530 is greater than or equal to the preset pressure, the pressure relief valve 520 opens, and the gas flowing out of the pressure relief valve 520 communicates with the sealing chamber 140 through the inside of the rod 330.

[0087] The moving end assembly 300 also includes a moving contact 320 connected to the rod 330. The rod 330 has a vent 331 inside, and the moving contact 320 is hollow inside to facilitate the communication between the pressure chamber 530 and the sealing chamber 140 through the vent 331.

[0088] When the pressure in pressure chamber 530 is lower than the preset pressure, closing the pressure relief valve 520 causes the moving end seat 310 to act like a piston, compressing the gas in pressure chamber 530. This causes the gas pressure in pressure chamber 530 to rise, generating a huge reverse force on the moving end seat 310, i.e., the compressed air reaction force. The compressed air reaction force is the main load that the operating mechanism needs to overcome when opening the circuit breaker, and the pressure reaction force simulation component mainly simulates this core load.

[0089] As the moving end assembly 300 continues to move in the opening direction, when the pressure is greater than or equal to the preset pressure, the pressure relief valve 520 switches to the open state, and the gas in the pressure chamber 530 flows back to the sealing chamber 140 through the vent 331. This process simulates the pressure release mechanism in a real arc-extinguishing chamber to control the opening speed and avoid mechanical impact. This complete simulation of the dynamic process of load establishment and load release makes the test conditions largely consistent with the actual operating conditions in terms of mechanical nature.

[0090] In addition, when the circuit is closed, the gas in the sealing cavity 140 flows into the pressure cavity 530 through the inside of the rod 330.

[0091] In terms of specific structure, such as Figure 8 and Figure 13 As shown, one end of the moving contact 320 is inserted into the end of the rod 330. A sleeve 340 is fitted on the outside of the connection between the moving contact 320 and the rod 330. By providing the sleeve 340, the connection strength between the moving contact 320 and the rod 330, as well as the sealing performance of the vent 331, are improved.

[0092] In one possible implementation, such as Figure 3 and Figure 8 As shown, the compressed air reaction force simulation component 500 also includes a support cylinder 512, which is located within the sealed cavity 140. One end of the support cylinder 512 is connected to the housing 100, and the other end is connected to the cylinder body 500. A pressure relief valve 520 is disposed between the cylinder body 500 and the support cylinder 512.

[0093] A connecting cavity 540 is formed between the pressure relief valve 520, the support cylinder 512, and the housing 100. When the pressure in the pressure chamber 530 is greater than or equal to the preset pressure, the pressure relief valve 520 connects the pressure chamber 530 and the connecting cavity 540, and the connecting cavity 540 is connected to the sealing cavity 140 through the inside of the rod 330.

[0094] The support cylinder 512 here not only facilitates the installation of the cylinder body 510 within the sealing cavity 140, but also, by forming a connecting cavity 540, facilitates the connection between the pressure cavity 530 and the venting channel 331 inside the rod body 330. To facilitate the connection between the venting channel 331 and the connecting cavity 540, a vent hole 332 is provided on the rod body 330. This vent hole 332 can be... Figure 9 The elongated shape shown can also be in other shapes. The number of vent holes 332 can be one or more, as long as the usage requirements are met.

[0095] In one possible implementation, such as Figure 8 and Figure 12As shown. The pressure relief valve 520 includes a valve seat 521, a first valve plate 522, a second valve plate 523, and a second elastic element 524. The valve seat 521 is disposed inside the cylinder 510, and the valve seat 521 is provided with a plurality of first vent ports 5214. The first valve plate 522 and the second valve plate 523 are disposed at intervals along the axial direction of the valve seat 521, and the first valve plate 522 is movably disposed between the first vent ports 5214 and the second valve plate 523.

[0096] When the pressure in the pressure chamber 530 is less than the preset pressure, the first valve plate 522 moves toward the second valve plate 523 to close the pressure relief valve 520. When the pressure in the pressure chamber 530 is greater than or equal to the preset pressure, the second valve plate 523 moves toward the second elastic member 524 and compresses the second elastic member 524 to open the pressure relief valve 520, and the pressure chamber 530 communicates with the sealing chamber 140 through the interior of the rod 330.

[0097] The pressure relief valve 520 in this embodiment has three operating states. These three states of the pressure relief valve 520 reproduce the complex pressure changes in the gas chamber during the opening and closing process of a real circuit breaker, providing the operating mechanism with a dynamic load that is close to the actual operating conditions.

[0098] Specifically, in the initial stage of the tripping action, the pressure in the pressure chamber 530 rises but is less than the preset pressure, and the pressure relief valve 520 is closed, which helps to ensure the establishment of compressed air reaction force. As the tripping action continues, when the pressure in the pressure chamber 530 is greater than or equal to the preset pressure, the gas drives the pressure relief valve 520 to open, thereby allowing the pressure chamber 530 to connect to the sealing chamber 140 through the vent 331, thus realizing the pressure relief of the pressure chamber 530.

[0099] When the circuit is closed, the gas in the sealing cavity 140 flows into the pressure cavity 530 through the interior of the rod 330. This creates a low-resistance intake channel from the sealing cavity 140 to the pressure cavity 530, ensuring that the pressure cavity 530 can be replenished with gas when the circuit is closed.

[0100] like Figure 10 , Figure 11 and Figure 12As shown, the valve seat 521 has a disc 5211, a tube 5212 connected to the side of the disc 5211 away from the moving end assembly 300, and a mounting sleeve 5213 covering the tube 5212. A rod 330 passes through the disc 5211 and the tube 5212. The valve seat 521 is connected to the cylinder 510 via the disc 5211, and a first vent 5214 is provided on the disc 5211. The mounting sleeve 5213 is fitted over the tube 5212 and connected to the end of the tube 5212 away from the disc 5211. A first valve plate 522 and a second valve plate 523 are spaced apart outside the tube 5212 along a direction away from the moving end seat 310, and are located between the disc 5211 and the mounting sleeve 5213.

[0101] In one possible implementation, the first vent 5214 is a plurality of vents spaced apart circumferentially and radially along the disc body 5211. A radially inwardly protruding first limiting protrusion 5121 is provided on the inner side of the cylinder 510. The first valve plate 522 moves between the disc body 5211 and the first limiting protrusion 5121. When the first valve plate 522 abuts against the disc body 5211, the first valve plate 522 partially blocks the first vent 5214. The inner peripheral wall of the first valve plate 522 is spaced apart from the tube body 5212 to form a first vent gap 550 between them.

[0102] The tube body 5212 is provided with a second limiting protrusion 5215 located on the side of the second valve plate 523 facing the first valve plate 522. Under the action of the second elastic member 524, the second valve plate 523 abuts against the second limiting protrusion 5212. At this time, the second valve plate 523 is located in the space defined by the second limiting protrusion 5215 and the mounting sleeve 5213, and the outer peripheral wall of the second valve plate 523 is spaced apart from the inner peripheral wall of the first limiting protrusion 5121 to form a second ventilation gap 570 between them.

[0103] The diameter of the outer contour of the first valve plate 522 is greater than the diameter of the outer contour of the second valve plate 523, and the diameter of the inner contour of the first valve plate 522 is greater than the diameter of the inner contour of the second valve plate 523.

[0104] In the closed position, the first valve plate 522 and the second valve plate 523 are spaced apart, forming an intermediate venting gap 560. The pressure relief valve 520 unidirectionally connects the connecting chamber 540 and the pressure chamber 530, allowing gas to flow from the connecting chamber 540 sequentially through the second venting gap 570, the intermediate venting gap 560, and the first venting gap 550 into the pressure chamber 530. Meanwhile, the vent passage 331 transports the gas in the sealing chamber 140 to the connecting chamber 540.

[0105] When the valve is in the open position, if the pressure in the pressure chamber 530 is less than the preset pressure, the first valve plate 522 moves to be stacked on the second valve plate 523 to block the intermediate venting gap 560 and the second venting gap 570. The second valve plate 523 isolates the first venting gap 550 and the connecting chamber 540, thereby closing the pressure relief valve 520.

[0106] When the pressure in the pressure chamber 530 is greater than or equal to the preset pressure, the second valve plate 523 moves toward the second elastic member 524 and compresses the second elastic member 524. The second valve plate 523 separates from the first valve plate 522, thereby opening the pressure relief valve 520 to connect the pressure chamber 530 and the connecting chamber 540. The gas in the pressure chamber 530 flows into the connecting chamber 540 and into the sealing chamber 140 through the vent 331.

[0107] In this embodiment, the coordinated action of the disc 5211, the first limiting protrusion 5121, and the second limiting protrusion 5122 limits the movement stroke of the first valve plate 522 and the second valve plate 523. This mechanical structure ensures that the pressure relief valve 520 reliably and automatically switches between three operating states: low-pressure intake, high-pressure closure, and overpressure relief.

[0108] In one possible implementation, such as Figure 9 and Figure 13 As shown, the moving end seat 310 includes a sleeve 311, an end plate 312, and a third valve plate 313. The end plate 312 is connected to the end of the sleeve 311 away from the stationary end assembly 200, and the rod 330 passes through the end plate 312 and the third valve plate 313. The end plate 312 is provided with a second vent 3121, which is used to connect the pressure chamber 530 and the sealing chamber 140. The third valve plate 313 is movably disposed inside the sleeve 311 along the axial direction of the sleeve 311.

[0109] When the pressure in the pressure chamber 530 is less than the preset pressure, the third valve plate 313 is used to block the second vent 3121. When the pressure in the pressure chamber 530 is greater than or equal to the preset pressure, the third valve plate 313 is used to open the second vent 3121 to connect the sealing chamber 140 and the pressure chamber 530.

[0110] In the initial stage of the tripping movement of the moving end assembly 300, the rod 330 begins to move, causing the moving end seat 310 to compress the pressure chamber 530. At this time, since the pressure has not yet been established, the pressure in the pressure chamber 530 is less than the preset pressure. The pressure relief valve 520 and the third valve plate 313 are both in the closed state, thereby sealing the pressure chamber 530 and allowing the pressure in the pressure chamber 530 to rise.

[0111] As the moving end assembly 300 continues to move, the pressure in the pressure chamber 530 rises to a level sufficient to move the third valve plate 313, at which point the second vent 3121 is opened. This provides a venting channel for the pressure chamber 530, allowing gas to flow back into the sealing chamber 140. This helps prevent excessive pressure in the pressure chamber 530.

[0112] Specifically, the sleeve 340 is connected to the end plate 312, and a limiting sleeve 350 is provided on the sleeve 340. The displacement stroke of the third valve plate 313 is limited between the limiting sleeve 350 and the end plate 312. The third valve plate 313 and the second vent 3121 serve as auxiliary structures of the pressure relief valve 520. The opening timing and venting capacity of the second vent 3121 make the gas flow process closer to that of a real arc-extinguishing chamber.

[0113] like Figure 3 As shown, when the rod 330 moves the moving end seat 310 towards the closed position, the pressure relief valve 520 is open, and the gas in the sealing cavity 140 flows into the pressure cavity 530 through the vent 331 and the connecting cavity 540. As the moving end assembly 300 moves, the volume of the pressure cavity 530 increases, creating a negative pressure that draws the gas from the sealing cavity 140 into the pressure cavity 530, compressing and storing the working fluid for the next opening. Therefore, the gas flow path during the closing process is: sealing cavity 140 → vent 331 → connecting cavity 540 → pressure relief valve 520 → pressure cavity 530.

[0114] like Figure 2 As shown, when the rod 330 moves the moving end seat 310 towards the open position, the moving end seat 310 compresses the air pressure in the pressure chamber 530. When the pressure in the pressure chamber 530 is less than the preset pressure, the pressure relief valve 520 is closed, and the third valve plate 313 blocks the second vent 3121. The gas in the pressure chamber 530 applies a compressed air reaction force to the moving end seat 310.

[0115] As the lever 330 continues to move towards the open position, when the pressure in the pressure chamber 530 is greater than or equal to the preset pressure, the pressure relief valve 520 is in the second open state. Simultaneously, the gas in the pressure chamber 530 drives the third valve plate 313 to move away from the second vent 3121, thereby opening the second vent 3121. At this time, the pressure chamber 530 is directly connected to the sealing chamber 140 through the second vent 3121, and the pressure chamber 530 is also connected to the sealing chamber 140 through the connecting chamber 540 and the vent 331.

[0116] At this time, the gas in pressure chamber 530 has two flow paths. The first flow path: pressure chamber 530 → pressure relief valve 520 → connecting chamber 540 → vent 331 → sealing chamber 140. The second flow path: pressure chamber 530 → second vent 3121 → sealing chamber 140.

[0117] The correspondence between the gas flow process described above and the closing and opening actions of the moving end component 300 is the same as the gas flow principle on a real circuit breaker, ensuring the reliability and effectiveness of the test.

[0118] In one possible implementation, such as Figure 2 and Figure 3 As shown. The mechanical life testing device for the operating mechanism in this embodiment of the application further includes a connecting plate 600, a crank arm 700, and a transmission shaft 800 disposed within the sealed cavity 140. One end of the connecting plate 600 is connected to the rod 330, and the other end of the connecting plate 600 is hinged to one end of the crank arm 700. The other end of the crank arm 700 is connected to one end of the transmission shaft 800, and the other end of the transmission shaft 800 extends out of the housing 100 and is connected to the operating mechanism. The operating mechanism drives the crank arm 700 to rotate via the transmission shaft 800, thereby causing the connecting plate 600 and the rod 330 to move axially along the housing 100.

[0119] Here, the operating force output by the operating mechanism needs to be transmitted to the rod 330 in the moving end assembly 300 through the drive shaft 800, crank arm 700 and connecting plate 600. This allows the moving end assembly 300 to move between the closed position and the open position, overcoming the clamping force of the contact finger 410 and the air pressure reaction force, respectively.

[0120] The drive shaft 800, crank arm 700, and connecting plate 600 all possess good rigidity and strength, capable of withstanding cyclic loads without elastic deformation or damage, thus ensuring that the load applied to the operating mechanism is accurately transmitted to the moving end assembly 300. The hinged design between the connecting plate 600 and the crank arm 700 facilitates ensuring that the crank arm 700 drives the connecting plate 600 and the rod 330 to move linearly along the axial direction of the housing 100.

[0121] The crank arm 700 is housed within the crank arm housing 130, and part of the connecting plate 600 is located within the cylinder 500, while the other part is located within the crank arm housing 130. It can be understood that the function of the drive shaft 800, crank arm 700, and connecting plate 600 is to transmit the force output by the operating mechanism to the moving end assembly 300. In specific implementations, the specific form of the transmission structure is not limited to the way the drive shaft 800, crank arm 700, and connecting plate 600 are coupled.

[0122] In addition, to ensure the sealing effect of the sealing cavity 140, a sealing element is provided at any opening position on the housing 100. A seal is provided between the drive shaft 800 and the housing 100. Of course, the seal here does not affect the drive shaft 800 from rotating the crank arm 700.

[0123] In one possible implementation, such as Figures 1 to 3As shown. The mechanical life test device for the operating mechanism in this embodiment of the application further includes an insulating component 150 and a conductor 900. The insulating component 150 is disposed between the housing 100 and the stationary end assembly 200, and the conductor is disposed on the housing 100 and is insulated from the housing 100. One end of the conductor is electrically connected to the stationary end assembly 200, and the moving end assembly 300 is electrically connected to the housing 100. When the circuit is closed, the conductor 900 and the housing 100 form a test circuit.

[0124] This test circuit provides a simple, direct, and objective electrical basis for determining whether the operating mechanism can reliably complete the closing process and establish good electrical contact each time. The test circuit is active when closing and disconnected when opening.

[0125] Specifically, the insulating component 150 is disposed between the stationary end seat 210 and the cover 120. The conductor 900 can be made of bolts, with one end inserted into the stationary contact 220 and the other end located outside the cover 120. The conductor and the cover 120 are insulated from each other by an insulating sleeve 160. The housing 100, the rod 330, the connecting plate 600, and the crank arm 700 are all made of metal. The housing 100 can be electrically connected to any one of the rod 330, the connecting plate 600, and the crank arm 700 via a wire, thereby realizing the electrical connection between the housing 100 and the moving contact.

[0126] In addition, such as Figure 2 As shown, the mechanical life testing device for the operating mechanism also includes a pressure detection element 1000. The pressure detection element 1000 monitors the pressure within the sealing cavity 140 in real time, correlating the pressure reading with the actual force applied to the operating mechanism. Before or during each test, observing pressure changes verifies whether the entire pneumatic system is functioning correctly and whether the seal is adequate. In practice, the pressure detection element 1000 can be a pressure sensor or a pressure gauge with pressure detection and display functions.

[0127] The mechanical life testing device for the operating mechanism of this application reproduces the core mechanical load of the arc-extinguishing chamber of a real circuit breaker on the operating mechanism through the touch finger simulation component 400 and the compressed air reaction force simulation component 500, while completely eliminating the need for the arc-extinguishing chamber itself. Furthermore, the testing device has high structural reliability and a long service life, thus helping to reduce testing costs.

[0128] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only.

[0129] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A mechanical life testing device for an operating mechanism, characterized in that, include: The housing (100) has a sealed cavity (140) inside. Stationary end assembly (200), the stationary end assembly (200) being disposed within the sealed cavity (140); Moving end assembly (300), the moving end assembly (300) is disposed in the sealed cavity (140), the moving end assembly (300) is used to connect with the operating mechanism to be tested, the moving end assembly (300) is configured to move in the sealed cavity (140) under the drive of the operating mechanism to switch between a closed position connected to the stationary end assembly (200) and a closed position separated from the stationary end assembly (200); A touch finger simulation component (400) is disposed on the stationary end component (200) and is configured to apply a clamping force to the moving end component (300) in the closed position. A compressed air reaction force simulation component (500) is disposed within the sealed cavity (140), at least a portion of the moving end component (300) is located within the compressed air reaction force simulation component (500), and the compressed air reaction force simulation component (500) is configured to apply a compressed air reaction force to the moving end component (300) in the open position.

2. The mechanical life testing device for operating mechanisms according to claim 1, characterized in that, The stationary end assembly (200) includes a stationary end seat (210) and a stationary contact (220). The stationary end seat (210) is disposed in the sealed cavity (140), and the stationary contact (220) is disposed on the stationary end seat (210). The finger simulation component (400) includes a plurality of fingers (410) and a plurality of first elastic elements (420). The plurality of fingers (410) are arranged at circumferential intervals along the stationary end seat (210), and the plurality of first elastic elements (420) are respectively disposed between each of the fingers (410) and the stationary end seat (210). In the closed position, a plurality of the first elastic elements (420) apply a plurality of radial clamping forces to the moving end assembly (300) through a plurality of the contact fingers (410), and the plurality of radial clamping forces form the clamping force.

3. The mechanical life testing device for operating mechanisms according to claim 2, characterized in that, Each of the aforementioned fingers (410) has a guide slope (411) at one end facing the moving end assembly (300); As the moving end assembly (300) moves toward the stationary end assembly (200), the guide ramp (411) is used to guide the moving end assembly (300) to radially press the finger (410).

4. The mechanical life testing device for operating mechanisms according to claim 2, characterized in that, The stationary end seat (210) includes a main body (211) and a cover (212). The cover (212) is sleeved on a portion of the main body (211). An annular mounting groove (213) is defined between the cover (212) and the main body (211). A plurality of the touch fingers (410) are respectively slidably disposed in the mounting groove (213) along the radial direction of the main body (211). One end of the first elastic element (420) is connected to the contact finger (410), and the other end is connected to the bottom of the mounting groove (213).

5. The mechanical life testing device for operating mechanisms according to any one of claims 1 to 4, characterized in that, The compressed air reaction force simulation component (500) includes a cylinder (510) and a pressure relief valve (520), the pressure relief valve (520) being disposed inside the cylinder (510); The moving end assembly (300) includes a rod (330) and a moving end seat (310). The rod (330) is located inside the cylinder (510), and the moving end seat (310) is connected to the rod (330). The rod (330) is used to connect with the operating mechanism. A pressure chamber (530) is formed between the cylinder (510), the moving end seat (310), and the pressure relief valve (520). When the circuit is open, the moving end seat (310) compresses the gas in the pressure chamber (530). When the pressure in the pressure chamber (530) is less than the preset pressure, the pressure relief valve (520) is closed, and the gas in the pressure chamber (530) applies the compressed air reaction force to the moving end seat (310). When the pressure in the pressure chamber (530) is greater than or equal to the preset pressure, the pressure relief valve (520) opens, and the gas flowing out of the pressure relief valve (520) communicates with the sealing chamber (140) through the inside of the rod (330).

6. The mechanical life testing device for operating mechanisms according to claim 5, characterized in that, The compressed air reaction force simulation component (500) also includes a support cylinder (512), which is located inside the sealing cavity (140). One end of the support cylinder (512) is connected to the housing (100), and the other end is connected to the cylinder body (500). The pressure relief valve (520) is disposed between the cylinder body (500) and the support cylinder (512). A connecting cavity (540) is formed between the pressure relief valve (520), the support cylinder (512), and the housing (100). When the pressure in the pressure chamber (530) is greater than or equal to the preset pressure, the pressure relief valve (520) connects the pressure chamber (530) and the connecting cavity (540). The connecting cavity (540) is connected to the sealing cavity (140) through the inside of the rod (330). And / or, in the closed position, the gas in the sealing cavity (140) flows into the pressure cavity (530) through the interior of the rod (330).

7. The mechanical life testing device for operating mechanisms according to claim 5, characterized in that, The pressure relief valve (520) includes a valve seat (521), a first valve plate (522), a second valve plate (523), and a second elastic element (524). The valve seat (521) is disposed inside the cylinder (510), and the valve seat (521) is provided with a plurality of first vent ports (5214); the first valve plate (522) and the second valve plate (523) are disposed on the valve seat (521) at intervals along the axial direction of the valve seat (521), the first valve plate (522) is movably disposed between the first vent port (5214) and the second valve plate (523), and the second elastic member (524) is disposed between the second valve plate (523) and the valve seat (521); When the pressure in the pressure chamber (530) is less than the preset pressure, the first valve plate (522) moves toward the second valve plate (523) to put the pressure relief valve (520) in the closed state. When the pressure in the pressure chamber (530) is greater than or equal to the preset pressure, the second valve plate (523) moves toward the second elastic member (524) and compresses the second elastic member (524) to open the pressure relief valve (520). The pressure chamber (530) is connected to the sealing chamber (140) through the interior of the rod (330).

8. The mechanical life testing device for operating mechanisms according to claim 5, characterized in that, The moving end seat (310) includes a sleeve (311), an end plate (312), and a third valve plate (313). The end plate (312) is connected to the end of the sleeve (311) away from the stationary end assembly (200). The rod (330) passes through the end plate (312) and the third valve plate (313). The end plate (312) is provided with a second vent (3121) for connecting the pressure chamber (530) and the sealing chamber (140). The third valve plate (313) is movably disposed in the sleeve (311) along the axial direction of the sleeve (311). When the pressure in the pressure chamber (530) is less than the preset pressure, the third valve plate (313) is used to block the second vent (3121); when the pressure in the pressure chamber (530) is greater than or equal to the preset pressure, the third valve plate (313) is used to open the second vent (3121) to connect the sealing chamber (140) and the pressure chamber (530).

9. The mechanical life testing device for operating mechanisms according to claim 5, characterized in that, It also includes a connecting plate (600), a crank arm (700), and a drive shaft (800) disposed in the sealed cavity (140). One end of the connecting plate (600) is connected to the rod (330), the other end of the connecting plate (600) is hinged to one end of the crank arm (700), the other end of the crank arm (700) is connected to one end of the drive shaft (800), and the other end of the drive shaft (800) extends out of the housing (100) and is connected to the operating mechanism; The operating mechanism drives the crank arm (700) to rotate via the transmission shaft (800), thereby causing the connecting plate (600) and the rod (330) to move axially along the housing (100).

10. The mechanical life testing device for operating mechanisms according to any one of claims 1 to 4, characterized in that, It also includes an insulating element (150) and a conductor (900). The insulating element (150) is disposed between the housing (100) and the stationary end assembly (200). The conductor is disposed on the housing (100) and is insulated from the housing (100). One end of the conductor is electrically connected to the stationary end assembly (200). The moving end assembly (300) is electrically connected to the housing (100). When the circuit is closed, the conductor (900) and the housing (100) form a test circuit.

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