Self-locking opening range burn-in detection tool for vacuum arc-extinguishing chamber and assembly method of self-locking opening range burn-in detection tool

Abstract

The invention relates to the technical field of arc extinguish chambers, and discloses a self-locking opening range burn-in detection tool for a vacuum arc extinguish chamber and an assembling method.The self-locking opening range burn-in detection tool for the vacuum arc extinguish chamber comprises a connector, a cam, a supporting cylinder and a limiting screw, the movable conducting rod is prevented from rotating in the screwing-in process of the connector, the situation that the corrugated pipe is sprained or excessively compressed due to rotation of the movable conducting rod in the thread screwing process is avoided, and the service life of the corrugated pipe is prolonged. A sawtooth-shaped groove formed in the connector is clamped with a limiting step at the top of the cam to form a self-locking mechanism, when the connector is screwed in place, the sawtooth-shaped groove makes contact with the limiting step, at the moment, when the connector is screwed downwards, the limiting step of the cam blocks the connector, and therefore the connector cannot be screwed off continuously, the design guarantees the consistency of the opening distance, and the service life of the connector is prolonged. The excessive compression of the corrugated pipe caused by excessive screwing is avoided, and meanwhile, the accuracy of aging detection is also improved.

Description

Technical Field

[0001] The invention belongs to the technical field of arc extinguishing chambers, and in particular relates to a tooling and an assembly method for self-locking opening distance aging detection of a vacuum arc extinguishing chamber. Background Art

[0002] In the long-term use of vacuum switches, vacuum interrupters play a vital role. They not only need to carry the working current to maintain the connection of the circuit under normal operation, but also need to quickly cut off the short-circuit current in the event of a fault to protect the power system from damage. In addition, vacuum interrupters also shoulder the key task of fault isolation, that is, to provide reliable electrical isolation in the disconnected state to ensure the stable operation of the power system and the safety of personnel. Therefore, the insulation performance, mechanical strength and stable operation ability of vacuum interrupters under high voltage and high current conditions are the basis for ensuring the safe and reliable operation of the entire vacuum switch and even the entire power system.

[0003] In order to ensure that the vacuum interrupter can meet the stringent operating requirements, manufacturers will conduct a series of rigorous quality tests on the products before they leave the factory, including but not limited to high-voltage aging tests, vacuum degree measurements, and withstand voltage tests. These tests are designed to verify the insulation strength, arc extinguishing performance, and sealing performance of the interrupter under extreme conditions, thereby ensuring that each product meets the established quality standards. During these tests, a crucial step is to pull the moving and stationary contacts of the vacuum interrupter apart to a predetermined distance for accurate measurement and evaluation.

[0004] At present, the existing distance separation tooling includes three parts: a support tube, a cam and a connector. The support tube is generally supported on the movable end cover of the arc extinguishing chamber as the basic support of the entire tooling; the connector is connected to the movable conductive rod of the arc extinguishing chamber through a thread design, and by rotating the connector, the screw action of the thread is used to achieve a tight connection with the arc extinguishing chamber. Subsequently, the moving contact and the static contact are pulled apart to a certain distance through the cam.

[0005] However, the following problems often exist in the opening and closing tooling: for the arc extinguishing chamber with a small self-closing force, it is not easy to control during the process of screwing through the connecting head thread, which can easily sprain the bellows and cause excessive compression of the bellows, resulting in air leakage in the bellows or reducing the life of the bellows, affecting the life of the arc extinguishing chamber. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned problems and provide a self-locking opening distance aging detection tooling and assembly method for a vacuum interrupter, which will not over-compress the bellows during actual use, thereby increasing the service life of the bellows and further improving the quality reliability and stability of the vacuum interrupter.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: In the first aspect, the present invention provides a self-locking opening distance aging detection tool for a vacuum arc chamber, including a support tube, a cam and a limit screw are arranged on the support tube, a connecting head is arranged above the cam, the connecting head is connected to a moving conductive rod, a moving conductive rod is provided with a moving conductive rod milling flat, the limit screw is fixed to the moving conductive rod milling flat, a limiting step is arranged on the top of the cam, a serrated groove is arranged on the connecting head, and the serrated groove is engaged with the limiting step.

[0008] A further improvement of the present invention is that the cam is made of stainless steel.

[0009] A further improvement of the present invention is that the limit screw is made of polytetrafluoroethylene.

[0010] A further improvement of the present invention is that the sawtooth groove is configured as a single-sided chamfer.

[0011] A further improvement of the present invention is that the support tube and the connecting head are both made of stainless steel.

[0012] A further improvement of the present invention is that the connector is connected to the movable conductive rod via a thread.

[0013] A further improvement of the present invention is that the support tube is arranged on the guide sleeve.

[0014] A further improvement of the present invention is that the inner diameter of the guide sleeve matches the outer diameter of the support tube.

[0015] In a second aspect, the present invention further provides a method for assembling a tool for self-locking opening distance aging detection for a vacuum interrupter, comprising the following steps: Step 1, connect the limit screw and the support tube together; Step 2, fixing the cam and the support tube together; Step 3: Place the fixed cam, support tube and limit screw on the arc extinguishing chamber, and fix the limit screw and the moving conductive rod by milling flat; Step 4: Screw the connector into the moving conductive rod until the bottom of the connector contacts the cam. At this time, the serrated groove of the connector contacts the limit step of the cam. When it is rotated further, the limit step of the cam blocks the connector, thus completing the assembly.

[0016] A further improvement of the present invention is that in step 4, when the connector is blocked by the limiting step of the cam, the connector stops rotating immediately.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a self-locking opening distance aging detection tool for a vacuum arc extinguishing chamber. The limit screw and the moving conductive rod are milled and fixed to prevent the moving conductive rod from rotating during the screwing-in process of the connecting head, thereby avoiding the sprain or excessive compression of the bellows caused by the rotation of the moving conductive rod during the screwing process of the thread, thereby extending the service life of the bellows; the serrated groove arranged on the connecting head is engaged with the limiting step on the top of the cam, forming a self-locking mechanism. When the connecting head is screwed into place, the serrated groove contacts the limiting step. At this time, when the connecting head is screwed downward again, the cam limiting step blocks the connecting head, so that it cannot be screwed down further. This design ensures the consistency of the opening distance, avoids excessive compression of the bellows caused by excessive screwing-in, and also improves the accuracy of aging detection.

[0018] Furthermore, the cam, support tube and connector are all made of stainless steel. Stainless steel has excellent corrosion resistance and can resist the erosion of various chemical substances. During the aging inspection of the vacuum arc chamber, the tooling will be exposed to various media and environments. Stainless steel can effectively prevent the tooling from being damaged due to corrosion, thereby extending the service life of the tooling. In addition, stainless steel has high strength and hardness and can withstand greater mechanical stress and pressure. During the use of the tooling, the cam needs to withstand a certain amount of pressure and friction, the support tube needs to support the weight of the entire tooling, and the connector needs to be tightly connected to the moving conductive rod and transmit force. The high strength characteristics of stainless steel can ensure that the tooling will not be deformed or damaged during these processes.

[0019] Furthermore, the serrated groove is set as a single-sided chamfer. This design makes the cooperation between the serrated groove and the limit step of the cam more stable. When the connecting head is blocked by the limit step of the cam, the contact area between the two is increased due to the presence of the chamfer, thereby improving the stability and reliability of the connection; in addition, the design of the single-sided chamfer helps the connecting head to be more smoothly inserted and matched into the limit step of the cam. This design reduces the difficulty of assembly and disassembly and improves work efficiency; during the rotation and matching process, the serrated groove with a single-sided chamfer can reduce the friction and wear between the cam limit step, thereby extending the service life of the tooling. At the same time, the presence of the chamfer can also reduce the damage caused by collision or friction.

[0020] Furthermore, the support tube is arranged on a guide sleeve, which is used to guide and position the support tube to ensure the stability and accuracy of the tooling during operation. The inner diameter of the guide sleeve matches the outer diameter of the support tube, making the tooling structure more compact and improving the overall stability and reliability.

[0021] The present invention also provides an assembly method for a self-locking opening distance aging detection tool for a vacuum arc chamber, by gradually connecting and fixing the limit screws, cams and support tubes on the arc chamber, accurate alignment between the components is ensured, and the connection process between the connector and the moving conductive rod is precisely controlled by the limit step, thereby avoiding assembly errors caused by excessive rotation and improving assembly accuracy; during the assembly process, the limit screw preliminarily fixes the moving conductive rod to prevent the moving conductive rod from rotating during the screwing-in process of the connector, thereby avoiding possible sprain of the bellows caused by the rotation of the moving conductive rod, and the serrated groove designed for the connector cooperates with the limit step on the top of the cam to ensure that the connector cannot continue to rotate after being screwed into place, thereby avoiding air leakage or reduced life due to excessive compression of the bellows. The assembly method is simple and easy to understand, easy to operate, and helps to improve assembly efficiency.

[0022] Furthermore, when the connector is blocked by the limit step of the cam, the rotation is stopped immediately. Through the cooperation between the limit step of the cam and the connector, the screw-in depth of the connector can be accurately controlled to prevent the bellows from being compressed due to excessive rotation, thereby avoiding air leakage of the bellows or reducing its service life, effectively protecting the bellows and ensuring the stability and reliability of the vacuum arc chamber. When the connector is blocked by the limit step of the cam, the rotation is stopped immediately, which not only protects the bellows and ensures the accuracy of the opening distance, but also improves the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are only schematic, used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention.

[0024] Figure 1 It is a front view of the tooling structure for self-locking opening distance aging detection for vacuum interrupter of the present invention; Figure 2 It is a side view of the three-dimensional structure of the tooling for self-locking opening distance aging detection for the vacuum interrupter of the present invention; Figure 3 It is a front view of the three-dimensional structure of the tooling for self-locking opening distance aging detection for the vacuum interrupter of the present invention; Figure 4 It is a schematic diagram of the structure of the self-locking opening distance aging detection tooling for the vacuum interrupter of the present invention after assembly.

[0025] Among them: 1. cam; 2. support tube; 3. limit screw; 4. connector; 5. moving conductive rod; 6. moving conductive rod milling; 7. guide sleeve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1 , Figure 2 and Figure 4 As shown, the embodiment of the present invention provides a self-locking opening distance aging detection tool for a vacuum interrupter, comprising a cam 1, a support tube 2, a limit screw 3, a connector 4, a moving conductive rod 5 and a moving conductive rod flattening 6; The cam 1 and the limit screw 3 are installed on the support tube 2, and the connecting head 4 is arranged above the cam 1. The connecting head 4 is connected to the moving conductive rod 5 of the arc extinguishing chamber through a thread. This connection method is both firm and convenient for disassembly; the limit screw 3 is fixed to the moving conductive rod by the milling flat 6, thereby realizing the limiting effect on the moving conductive rod. This design prevents the rotation of the moving conductive rod during the screwing-in process of the connecting head 4, thereby avoiding the twisting and excessive compression of the bellows; the top of the cam 1 is designed with a limiting step, and the connecting head 4 is provided with a serrated groove. The limiting step designed on the top of the cam 1 matches the serrated groove provided on the connecting head 4, which can ensure that the connecting head 4 is accurately limited after being screwed into place, thereby avoiding damage to the bellows caused by excessive screwing.

[0033] In the present embodiment, the cam 1, the support tube 2 and the connector 4 are all made of stainless steel. The stainless steel material has excellent corrosion resistance and can resist the erosion of various chemical substances. During the aging inspection of the vacuum arc chamber, the tooling will be exposed to various media and environments. The stainless steel material can effectively prevent the tooling from being damaged due to corrosion, thereby extending the service life of the tooling. In addition, the stainless steel material has high strength and hardness and can withstand greater mechanical stress and pressure. During the use of the tooling, the cam needs to withstand a certain amount of pressure and friction, the support tube needs to support the weight of the entire tooling, and the connector needs to be tightly connected to the moving conductive rod and transmit force. The high strength characteristics of stainless steel can ensure that the tooling will not be deformed or damaged during these processes.

[0034] In this embodiment, the limit screw 3 is made of polytetrafluoroethylene, which has an extremely low friction coefficient. This allows the limit screw 3 to reduce friction resistance and wear when it contacts the milled flat part of the moving conductive rod, thereby extending the service life of the tooling. At the same time, polytetrafluoroethylene can resist the erosion of a variety of strong acids, strong alkalis and organic solvents. During the aging inspection of the vacuum arc chamber, the polytetrafluoroethylene material can effectively prevent the limit screw 3 from being damaged by corrosion.

[0035] The serrated groove on the connecting head 4 is set to a single-sided chamfer. This design makes the cooperation between the serrated groove and the limiting step of the cam more stable. When the connecting head 4 is blocked by the limiting step of the cam 1, the contact area between the two is increased due to the presence of the chamfer, thereby improving the stability and reliability of the connection; in addition, the design of the single-sided chamfer helps the connecting head 4 to be inserted and matched into the limiting step of the cam 1 more smoothly. This design reduces the difficulty of assembly and disassembly and improves work efficiency; during the rotation and matching process, the serrated groove with a single-sided chamfer can reduce the friction and wear between the limiting step of the cam 1, thereby extending the service life of the tooling. At the same time, the presence of the chamfer can also reduce the damage caused by collision or friction.

[0036] like Figure 3 As shown, the support tube 2 is arranged on a guide sleeve 7, which is used to guide and position the support tube 2 to ensure the stability and accuracy of the tooling during operation. The inner diameter of the guide sleeve 7 matches the outer diameter of the support tube 2, making the tooling structure more compact and improving the overall stability and reliability.

[0037] The embodiment of the present invention also provides a method for assembling a tool for self-locking opening distance aging detection for a vacuum interrupter, comprising the following steps: Step 1: Select a limit screw 3 and a support tube 2 of appropriate specifications, and firmly connect the limit screw 3 to the preset position of the support tube 2 through threads to ensure that the connection is tight and there is no looseness; Step 2: Select a fixing that matches the support tube 2 and the cam 1, place the cam 1 on the support tube 2, ensure that the two are aligned, and use the fixing to fasten the cam 1 and the support tube 2 together to ensure that they are firmly fixed to avoid loosening or displacement during use; Step 3: Place the support tube 2 with the limit screw 3 connected and the cam 1 fixed on the arc extinguishing chamber as a whole, ensure that the support tube 2 is tightly fitted with the guide sleeve 7, adjust the position of the limit screw 3 to align it with the milling flat 6 of the moving conductive rod, and gently rotate the limit screw 3 to firmly fit it into the milling flat 6 of the moving conductive rod to achieve the limiting function and ensure that the connection between the limit screw 3 and the moving guide rod is stable and reliable; Step 4, select the connector 4 that matches the moving conductive rod 5, align the connector 4 with the moving conductive rod 5, and start to screw it in through the thread. During the screwing process, the coaxiality of the connector 4 and the moving conductive rod 5 must be maintained to avoid deflection or jamming. When the bottom of the connector 4 contacts the cam 1, the serrated groove of the connector 4 begins to contact the limit step of the cam 1. Continue to try to rotate the connector 4. When the connector 4 is blocked by the limit step of the cam 1, stop rotating immediately and confirm that the connector 4 is in the correct position.

[0038] Working principle: The tooling is stably mounted on the guide sleeve 7 of the arc extinguishing chamber through the support tube 2, providing a solid supporting foundation for the entire tooling. The cam 1 and the limit screw 3 are firmly mounted on the support tube 2 to ensure the stability and reliability of the tooling during operation. The limit screw 3 is fixed to the moving conductive rod by the milling flat 6, thereby realizing the limiting effect on the moving conductive rod 5 and preventing the moving conductive rod 5 from rotating during the screwing-in process of the connector 4. This design avoids the sprain and excessive compression of the bellows and ensures the safety and reliability of the tooling. The top of the cam 1 is designed with a limit step to match the serrated groove provided on the connector 4. When the connector 4 is connected to the moving conductive rod 5 through a thread and screwed into place, The serrated groove contacts and clamps with the limit step to realize the self-locking function. This design avoids damage to the bellows caused by excessive screwing of the connector 4, while ensuring a firm connection between the connector 4 and the moving conductive rod 5. The guide sleeve 7 arranged on the outside of the support tube 2 is used to guide and position the support tube 2 to ensure the stability and accuracy of the tooling during operation. This design improves the overall performance and reliability of the tooling. The present invention realizes the functions of stable support, limit anti-rotation, self-locking limit and guiding positioning of the self-locking opening distance aging detection tooling for vacuum arc chambers through reasonable structural design and material selection, thereby ensuring the safety and reliability of the tooling and improving work efficiency and detection accuracy.

[0039] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

[0040] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several simple deductions or substitutions, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. A self-locking opening distance aging detection tool for vacuum interrupter, characterized in that: The invention comprises a support tube (2), wherein a cam (1) and a limit screw (3) are arranged on the support tube (2), a connecting head (4) is arranged above the cam (1), the connecting head (4) is connected to a moving conductive rod (5), a moving conductive rod milling flat (6) is arranged on the moving conductive rod (5), the limit screw (3) is fixedly connected to the moving conductive rod milling flat (6), a limit step is arranged on the top of the cam (1), a serrated groove is arranged on the connecting head (4), and the serrated groove is engaged with the limit step.

2. A self-locking opening distance aging detection tool for vacuum interrupter according to claim 1, characterized in that: The cam (1) is made of stainless steel.

3. The self-locking opening distance aging detection tool for vacuum interrupter according to claim 1 is characterized in that: The limit screw (3) is made of polytetrafluoroethylene.

4. A self-locking opening distance aging detection tool for vacuum interrupter according to claim 1, characterized in that: The sawtooth groove is configured as a single-sided chamfer.

5. The self-locking opening distance aging detection tool for vacuum interrupter according to claim 1 is characterized in that: The support tube (2) and the connecting head (4) are both made of stainless steel.

6. A self-locking opening distance aging detection tool for vacuum interrupter according to claim 1, characterized in that: The connector (4) is connected to the movable conductive rod (5) via threads.

7. The self-locking opening distance aging detection tool for vacuum interrupter according to claim 1 is characterized in that: The support tube (2) is arranged on the guide sleeve (7).

8. The self-locking opening distance aging detection tool for vacuum interrupter according to claim 7, characterized in that: The inner diameter of the guide sleeve matches the outer diameter of the support tube (2).

9. An assembly method for a self-locking opening distance aging detection tool for a vacuum interrupter, characterized in that: The following steps are involved: Step 1: Connect the limit screw (3) and the support tube (2) together; Step 2, fixing the cam (1) and the support tube (2) together; Step 3, placing the fixed cam (1), the support tube (2) and the limit screw (3) on the arc extinguishing chamber, and fixing the limit screw (3) and the flattened movable conductive rod (6); Step 4: Screw the connector (4) into the movable conductive rod (5) until the bottom of the connector (4) contacts the cam (1). At this time, the serrated groove of the connector (4) contacts the limit step of the cam (1). When further rotated, the limit step of the cam (1) blocks the connector (4), thereby completing the assembly.

10. The method for assembling the self-locking opening distance aging detection tooling for vacuum interrupter according to claim 9, characterized in that: In step 4, when the connector (4) is blocked by the limiting step of the cam (1), the connector (4) immediately stops rotating.

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