Insulated pull rod with built-in shock absorbing oil and circuit breaker

Abstract

The utility model discloses an insulating pull rod and circuit breaker of built -in shock attenuation oil, including insulator, the embedded installation of pole seat is in the insulator, be provided with the containing cavity of one end opening in the pole seat, the containing cavity opening of pole seat is installed with guide bearing, the containing cavity of the inside of guide bearing constitutes the sealed cavity filled with oil liquid, and the piston rod is from outside to inside through guide bearing and then enters the sealed cavity, the piston rod end part in the sealed cavity is formed head portion to the circumferential extension, and the piston rod sealed cavity inside moves and is separated into two small cavities by the head portion in the piston rod axial direction, and the oil circuit of intercommunication is arranged between two small cavities, when the piston rod moves to the sealed cavity, can produce damping force by the flow of oil liquid between small cavities, and the energy of circuit breaker closing is helped to offset and absorbs, effectively reduces even avoids the emergence of vibration and rebound.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to an insulating tie rod with built-in damping oil and a circuit breaker. Background Technology

[0002] In power distribution systems, circuit breakers are a crucial component. As the actuating mechanism for opening and closing circuits, circuit breakers absorb the opening energy through a buffer device connected to the opening mechanism during opening; and they perform the closing action through an insulating rod connected to the arc-extinguishing chamber of the circuit breaker during closing.

[0003] In existing technology, the insulating tie rod of a circuit breaker typically incorporates a spring to absorb closing energy. Due to the high rigidity of the spring, it is prone to vibration and rebound, especially in fast circuit breakers where the closing kinetic energy is even greater, making vibration and rebound more likely. Utility Model Content

[0004] To address the aforementioned issues, this application provides an insulated tie rod and circuit breaker with a reasonable internal damping oil structure. The damping force generated by the flow of the oil helps to offset and absorb the closing energy of the circuit breaker, effectively reducing or even preventing vibration and rebound.

[0005] The technical solution adopted in this utility model is as follows: An insulated tie rod with built-in damping oil includes an insulator, a rod seat embedded in the insulator, a receiving cavity with one open end in the rod seat, a guide bearing installed at the opening of the receiving cavity of the rod seat, and the receiving cavity located inside the guide bearing forming a sealed cavity filled with oil. A piston rod passes through the guide bearing from the outside to the inside and then enters the sealed cavity. The end of the piston rod located in the sealed cavity extends circumferentially to form a head. The piston rod moves into the sealed cavity, and the head divides the sealed cavity into two small cavities in the axial direction of the piston rod. A communicating oil passage is provided between the two small cavities.

[0006] As a further improvement to the above technical solution: The oil passage is an oil hole opened in the head that connects the two small cavities, and / or, a gap formed between the circumferential edge of the head and the inner wall of the sealed cavity.

[0007] It also includes an elastic element, which is disposed between the piston rod and the rod seat. The elastic element applies an elastic force to the piston rod in the opposite direction to the direction in which the piston rod extends into the sealing cavity. The elastic element is located inside the sealing cavity or outside the guide bearing.

[0008] The piston rod has a stepped hole axially extending inward at its inner end. The stepped hole passes through the head and communicates with the piston rod wall, connecting the two small cavities. The larger section of the stepped hole faces the inner end of the piston rod, and a steel ball is placed inside the larger section. The diameter of the steel ball is larger than the diameter of the smaller section of the stepped hole.

[0009] The inner end of the piston rod extends outward to form a protrusion, the cross-sectional dimension of which is smaller than the diameter of the head; a spring pin is installed radially along the protrusion, the spring pin passing through the large hole section of the stepped hole, and the steel ball is confined within the large hole section by the spring pin.

[0010] It also includes a sponge, and the outer wall of the guide bearing is concave in the circumferential direction to form a receiving groove for accommodating the sponge. A through hole is opened on the side of the receiving groove, and the receiving groove communicates with a nearby small cavity through the through hole.

[0011] The inner end face of the guide bearing extends outward to form a convex ring section, and a groove is opened at the through hole of the convex ring section; a central hole is opened on the guide bearing for the piston rod to pass through and be fitted, and the inner diameter of the convex ring section is larger than the diameter of the central hole.

[0012] The rod seat and the guide bearing are respectively sealed and fitted together, and the guide bearing and the piston rod are respectively sealed and fitted together.

[0013] The accommodating cavity is a multi-stage hole structure with gradually increasing dimensions from the inside to the outside, including at least a first-stage hole, a second-stage hole, and a third-stage hole arranged sequentially from the innermost end to the outside. The head of the piston rod is adapted to be located at the second-stage hole, and the guide bearing is fitted into the third-stage hole. The outer diameter of the guide bearing is larger than the diameter of the second-stage hole.

[0014] A circuit breaker includes an insulating rod with built-in damping oil as described in any one of the above-mentioned methods, the insulating rod being connected to the arc-extinguishing chamber for closing and opening operations.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In this invention, when the piston rod moves into the sealed cavity, the flow of oil between the small cavities can generate a damping force, which helps to offset and absorb the closing energy of the circuit breaker, effectively reducing or even avoiding the vibration and rebound that occur when only springs are used to absorb energy. It is especially suitable for fast circuit breakers with larger closing kinetic energy. This utility model also has the following advantages: During the closing action, the piston rod moves toward the sealed cavity, and the elastic element applies an elastic force to the piston rod in the opposite direction of movement, thereby absorbing the closing energy. At the same time, the flow of oil forms a damping force to help offset and absorb the energy, effectively improving and ensuring the stability and reliability of the closing action. A steel ball is placed in the stepped hole at the end of the piston rod to form a one-way valve structure. When the piston rod is subjected to force and moves towards the sealing cavity, the steel ball in the stepped hole moves and fits against the orifice of the small section to achieve a blockage, so that the oil can only flow through the oil passage, effectively ensuring the damping force brought by the oil flow. When the piston rod moves in the opposite direction, the steel ball disengages from the orifice of the small section, allowing the stepped hole to be unobstructed. The oil can flow through both the oil passage and the stepped hole at the same time, effectively ensuring the smooth and unobstructed reverse movement of the piston rod. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the piston rod of this utility model.

[0018] Figure 3 This is a structural diagram of the guide bearing of this utility model.

[0019] Figure 4 This is a cross-sectional view of the guide bearing of this utility model.

[0020] The components include: 1. Piston rod; 2. Oil seal assembly; 3. Guide bearing; 4. Sealing ring; 5. Sponge; 6. Steel ball; 7. Spring pin; 8. Elastic element; 9. Rod seat; 10. Insulator. 11. Rod section; 12. Head; 13. Protrusion; 14. Stepped hole; 15. Pin hole; 16. Oil hole; 17. Radial hole; 31. First annular segment; 32. Circumferential groove; 33. Receiving groove; 34. Second annular segment; 35. Protruding annular segment; 36. Groove; 37. Through hole; 38. Center hole; 39. Inner annular groove; 91. First-order hole; 92. Second-order hole; 93. Third-order hole. Detailed Implementation

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 As shown, an insulating pull rod with built-in damping oil in this embodiment includes an insulator 10, a rod seat 9 embedded in the insulator 10, a receiving cavity with one end open in the rod seat 9, a guide bearing 3 installed at the opening of the receiving cavity of the rod seat 9, and the receiving cavity located inside the guide bearing 3 constitutes a sealed cavity filled with oil. The piston rod 1 passes through the guide bearing 3 from the outside to the inside and then enters the sealed cavity. The end of the piston rod 1 located in the sealed cavity extends circumferentially to form a head 12. The piston rod 1 moves into the sealed cavity and the head 12 divides the sealed cavity into two small cavities in the axial direction of the piston rod 1. A communicating oil passage is provided between the two small cavities.

[0023] In this embodiment, when the piston rod 1 moves into the sealed cavity, the flow of oil between the small cavities can generate a damping force, which helps to offset and absorb the closing energy of the circuit breaker, effectively reducing or even avoiding the vibration and rebound that occur when only springs are used to absorb energy in the existing system.

[0024] exist Figure 1 In the embodiment shown, as the piston rod 1 moves toward the interior of the sealed cavity, small cavities are formed above and below the head 12 of the piston rod 1. The upper small cavity is formed between the top end of the head 12 and the bottom end of the guide bearing 3, and the lower small cavity is formed between the bottom end of the head 12 and the inner wall of the cavity. As the piston rod 1 moves, the head 12 moves up or down, causing one of the two small cavities to increase in volume and the other to decrease in volume. The oil in the small cavity with the decreased volume flows into the small cavity with the increased volume.

[0025] In this embodiment, as the piston rod 1 moves toward the interior of the sealed cavity, the volume of the lower small cavity gradually decreases, while the volume of the upper small cavity gradually increases. The oil in the lower small cavity will flow through the oil passage to the upper small cavity, and the flow of the oil through the oil passage constitutes the damping force.

[0026] The oil passage is an oil hole 16 opened in the head 12 to connect the two small cavities, and / or the gap formed between the circumferential edge of the head 12 and the inner wall of the sealed cavity.

[0027] In one embodiment, the oil route is formed by an oil hole 16 opened on the head 12, and the oil flows through the oil hole 16 during the movement of the piston rod 1.

[0028] In actual operation, in order to increase the damping force to ensure the flow of oil through the oil hole 16, the diameter of the oil hole 16 is usually small, and one or more oil holes 16 can be set according to actual needs.

[0029] In another embodiment, the oil route is formed by the oil hole 16 opened on the head 12 and the gap between the head 12 and the inner wall of the sealed cavity; during the movement of the piston rod 1, the oil flows through the oil hole 16 and the gap.

[0030] In this embodiment, the gap between the head 12 and the inner wall of the sealed cavity can be formed by a size difference such as a clearance fit to allow the oil to flow, or a groove or other structure can be opened on the contacting wall to form the gap for the oil to flow.

[0031] It also includes an elastic element 8, which is disposed between the piston rod 1 and the rod seat 9. The elastic element 8 applies an elastic force to the piston rod 1 in the opposite direction to the direction in which the piston rod 1 extends into the sealing cavity. The elastic element 8 is located inside the sealing cavity or outside the guide bearing 3.

[0032] In this embodiment, during the closing action, the piston rod 1 moves toward the sealed cavity, and the elastic element 8 applies an elastic force to the piston rod 1 in the opposite direction of movement, thereby absorbing the closing energy. At the same time, the flow of oil forms a damping force to help offset and absorb the energy, effectively improving and ensuring the stability and reliability of the closing action.

[0033] In one embodiment, for example Figure 1 In the middle, the elastic element 8 is located between the inner end of the piston rod 1 and the bottom surface of the sealing cavity. As the piston rod 1 moves toward the sealing cavity, the elastic element 8 is compressed and absorbs energy.

[0034] In another embodiment, the elastic element 8 is disposed outside the guide bearing 3. For example, the elastic element 8 is mounted on the piston rod 1 outside the guide bearing 3, and the elastic element 8 can be press-fitted between the limiting member on the piston rod 1 and the end face of the rod seat 9.

[0035] In this embodiment, the elastic element 8 can be a spring.

[0036] The piston rod 1 has a stepped hole 14 axially extending inward at its inner end. The stepped hole 14 passes through the head 12 and communicates with the wall of the piston rod 1. The stepped hole 14 connects the two small cavities. The larger section of the stepped hole 14 faces the inner end of the piston rod 1. A steel ball 6 is placed in the larger section. The diameter of the steel ball 6 is larger than the diameter of the smaller section of the stepped hole 14.

[0037] In this embodiment, a steel ball 6 is provided in the stepped hole 14 at the end of the piston rod 1 to form a one-way valve structure. When the piston rod 1 is subjected to force and moves towards the sealing cavity, the steel ball 6 in the stepped hole 14 moves and fits against the orifice of the small section to achieve a blockage, so that the oil can only flow through the oil passage, effectively ensuring the damping force brought about by the oil flow. When the piston rod 1 moves in the reverse direction, the steel ball 6 disengages from the orifice of the small section, making the stepped hole 14 unobstructed. The oil can flow through both the oil passage and the stepped hole 14 at the same time, effectively ensuring the smooth and unobstructed reverse movement of the piston rod 1.

[0038] exist Figure 1 and Figure 2 In the embodiment shown, the large section of the stepped hole 14 is connected to the lower small cavity, and the small section of the stepped hole 14 is connected to a radial hole 17, which penetrates the wall of the piston rod 1 and is connected to the upper small cavity. When the steel ball 6 leaves the opening of the small section, the stepped hole 14 is unobstructed, allowing the upper and lower small cavities to be connected through the stepped hole 14 so that oil can flow. When the steel ball 6 is attached to and blocks the opening of the small section, the stepped hole 14 is obstructed, so that the upper and lower small cavities are not connected at the stepped hole 14, and oil cannot flow through the stepped hole 14.

[0039] The inner end of the piston rod 1 extends outward to form a protrusion 13, the cross-sectional dimension of which is smaller than the diameter of the head 12; a spring pin 7 is installed radially along the protrusion 13, the spring pin 7 passes through the large hole section of the stepped hole 14, and the steel ball 6 is confined within the large hole section by the spring pin 7.

[0040] In this embodiment, the installation of the spring pin 7 on the protrusion 13 effectively prevents the steel ball 6 from falling out of the stepped hole 14, and does not affect the unobstructed flow of the stepped hole 14 when the steel ball 6 leaves the small hole section opening.

[0041] In this embodiment, a pin hole 15 can be opened through the radial direction of the protrusion 13, and the spring pin 7 is installed in the pin hole 15 to limit the steel ball 6.

[0042] In this embodiment, the piston rod 1 protrusion 13 can be fitted to the end of the elastic member 8 to ensure the reliability of the fitting structure between the piston rod 1 and the elastic member 8.

[0043] It also includes sponge 5, and the outer wall surface of guide bearing 3 is concave in the circumferential direction to form a receiving groove 33 for receiving sponge 5, such as Figure 3 and Figure 4 As shown, a through hole 37 is provided on the side of the receiving groove 33, and the receiving groove 33 communicates with a nearby small cavity through the through hole 37.

[0044] exist Figure 1 In the embodiment shown, the guide bearing 3 is located above the upper small cavity, and the sponge 5 in the receiving groove 33 is located above the upper small cavity. The receiving groove 33 can be connected to the upper small cavity through the through hole 37. The oil in the upper small cavity can flow into the receiving groove 33 through the through hole 37 and be absorbed by the sponge 5.

[0045] The inner end face of the guide bearing 3 extends outward to form a convex ring section 35. The convex ring section 35 has a groove 36 at the through hole 37 to ensure the communication between the through hole 37 and the small cavity.

[0046] In this embodiment, by setting the convex ring section 35 on the inner end face of the guide bearing 3, the piston rod 1 head 12 can be limited to move upward by the contact between the convex ring section 35 and the top surface of the head 12 during the movement of the piston rod 1 head 12 toward the guide bearing 3.

[0047] In actual operation, the end of the radial hole 17 on the piston rod 1 can be set to correspond with the groove 36 and the through hole 37. For example, they can be set in the same vertical plane. When the head 12 moves upward and abuts against the upper convex ring section 35, the radial hole 17 communicates with the groove 36 and the through hole 37.

[0048] The guide bearing 3 has a central hole 38 for the piston rod 1 to pass through and be fitted. The inner diameter of the convex ring section 35 is larger than the diameter of the central hole 38.

[0049] In this embodiment, the piston rod 1 includes a rod portion 11 that passes through the central hole 38 of the guide bearing 3 and extends circumferentially at the end of the rod portion 11 that passes through the guide bearing 3 to form a head 12.

[0050] In this embodiment, the pin hole 15 and the radial hole 17 are located on both sides of the head 12.

[0051] The rod seat 9 and the guide bearing 3, and the guide bearing 3 and the piston rod 1 are respectively sealed and fitted, thereby effectively ensuring the sealing of the sealing cavity.

[0052] In this embodiment, an circumferential groove 32 can be opened on the outer circumferential surface of the guide bearing 3, and a sealing ring 4 is installed in the circumferential groove 32 to form a sealing fit between the rod seat 9 and the guide bearing 3.

[0053] In this embodiment, the sealing ring 4 is located on the outside of the sealing cavity, away from the sponge 5, which effectively ensures the sealing of the oil.

[0054] In this embodiment, an inner annular groove 39 can be formed by circumferential indentation on the inner wall surface of the center hole 38 of the guide bearing 3. An oil seal assembly 2 is installed in the inner annular groove 39 to form a sealing assembly between the guide bearing 3 and the piston rod 1.

[0055] The accommodating cavity is a multi-stage hole structure with gradually increasing size from the inside to the outside, including at least a first-stage hole 91, a second-stage hole 92, and a third-stage hole 93 arranged sequentially from the innermost end to the outside. The head 12 of the piston rod 1 is adapted to be located at the second-stage hole 92, and the guide bearing 3 is fitted into the third-stage hole 93. The outer diameter of the guide bearing 3 is larger than the diameter of the second-stage hole 92.

[0056] In this embodiment, the guide bearing 3 is fitted at the third-stage hole 93, which effectively ensures the reliable fitting of the guide bearing 3 at the opening of the accommodating cavity of the rod seat 9.

[0057] In one embodiment, a fourth-order hole can be provided at the opening of the receiving cavity, and the sealing ring 4 is press-fitted at the third-order hole 93 near the fourth-order hole, which effectively realizes and ensures the installation of the guide bearing 3 and the sealing ring 4 relative to the rod seat 9, and ensures the installation reliability and stability of the sealing ring 4.

[0058] exist Figure 3 and Figure 4In the illustrated embodiment, the guide bearing 3 is provided with a first ring segment 31 and a second ring segment 34 along the axial direction. The diameter of the first ring segment 31 is larger than that of the second ring segment 34. The diameter of the first ring segment 31 is adapted to the diameter of the fourth-order hole of the rod seat 9 receiving cavity. The circumferential groove 32 for mounting the sealing ring 4 is formed at the junction of the first ring segment 31 and the second ring segment 34. After the guide bearing 3 and the sealing ring 4 are mounted in the rod seat 9, the reliable installation of the sealing ring 4 can be ensured through the first ring segment 31. The receiving groove 33 for mounting the sponge 5 is formed on the second ring segment 34.

[0059] In this embodiment, the piston rod 1 head 12 is fitted at the second-stage hole 92 and moves relative to it. The head 12 is limited in the moving direction by the first-stage hole 91 orifice step and the end face of the guide bearing 3 end convex ring section 35.

[0060] The circuit breaker in this embodiment includes an insulating rod with built-in damping oil as described above. The insulating rod is connected to the arc-extinguishing chamber for closing and opening operations.

[0061] This invention utilizes the damping force generated by the flow of oil to help counteract and absorb the closing energy of the circuit breaker, effectively reducing or even avoiding the vibration and rebound that occur when only springs are used to absorb energy. It is especially suitable for fast circuit breakers with larger closing kinetic energy.

[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0063] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An insulating tie rod with built-in shock-absorbing oil, characterized in that: The device includes an insulator (10), a rod seat (9) is embedded in the insulator (10), a receiving cavity with one end open is provided in the rod seat (9), a guide bearing (3) is installed at the opening of the receiving cavity of the rod seat (9), the receiving cavity located inside the guide bearing (3) constitutes a sealed cavity filled with oil, the piston rod (1) passes through the guide bearing (3) from the outside to the inside and then enters the sealed cavity; the end of the piston rod (1) located in the sealed cavity extends circumferentially to form a head (12), the piston rod (1) moves into the sealed cavity and the head (12) divides the sealed cavity into two small cavities in the axial direction of the piston rod (1), and a communicating oil passage is provided between the two small cavities.

2. The insulating tie rod with built-in shock-absorbing oil as described in claim 1, characterized in that: The oil passage is an oil hole (16) opened in the head (12) to connect the two small cavities, and / or, the gap formed between the circumferential edge of the head (12) and the inner wall of the sealed cavity.

3. An insulating tie rod with built-in shock-absorbing oil as described in claim 1, characterized in that: It also includes an elastic element (8), which is disposed between the piston rod (1) and the rod seat (9). The elastic element (8) applies an elastic force to the piston rod (1) in the opposite direction to the direction in which the piston rod (1) extends into the sealing cavity. The elastic element (8) is located inside the sealing cavity or outside the guide bearing (3).

4. An insulating tie rod with built-in shock-absorbing oil as described in claim 1, characterized in that: The piston rod (1) has a stepped hole (14) axially extending inward at its inner end. The stepped hole (14) passes through the head (12) and communicates with the wall of the piston rod (1). The stepped hole (14) connects the two small cavities. The large hole section of the stepped hole (14) faces the inner end of the piston rod (1). A steel ball (6) is placed in the large hole section. The diameter of the steel ball (6) is larger than the diameter of the small hole section of the stepped hole (14).

5. An insulating tie rod with built-in shock-absorbing oil as described in claim 4, characterized in that: The inner end of the piston rod (1) extends outward to form a protrusion (13), the cross-sectional dimension of the protrusion (13) is smaller than the diameter of the head (12); a spring pin (7) is installed radially along the protrusion (13), the spring pin (7) passes through the large hole section of the stepped hole (14), and the steel ball (6) is confined within the large hole section by the spring pin (7).

6. An insulating tie rod with built-in shock-absorbing oil as described in claim 1, characterized in that: It also includes a sponge (5), and the outer wall of the guide bearing (3) is recessed in the circumferential direction to form a receiving groove (33) for receiving the sponge (5). A through hole (37) is provided on the side of the receiving groove (33), and the receiving groove (33) is connected to a nearby small cavity through the through hole (37).

7. An insulating tie rod with built-in shock-absorbing oil as described in claim 6, characterized in that: The inner end face of the guide bearing (3) extends outward to form a convex ring section (35), and the convex ring section (35) has a groove (36) at the through hole (37); the guide bearing (3) has a central hole (38) for the piston rod (1) to pass through and be fitted, and the inner diameter of the convex ring section (35) is larger than the diameter of the central hole (38).

8. An insulating tie rod with built-in shock-absorbing oil as described in claim 1, characterized in that: The rod seat (9) and the guide bearing (3) are respectively sealed and fitted together, and the guide bearing (3) and the piston rod (1) are respectively sealed and fitted together.

9. An insulating tie rod with built-in shock-absorbing oil as described in claim 1, characterized in that: The accommodating cavity is a multi-stage hole structure with gradually increasing size from the inside to the outside, including at least a first-stage hole (91), a second-stage hole (92), and a third-stage hole (93) arranged sequentially from the innermost end to the outside. The head (12) of the piston rod (1) is adapted to be located at the second-stage hole (92), and the guide bearing (3) is fitted into the third-stage hole (93). The outer diameter of the guide bearing (3) is larger than the diameter of the second-stage hole (92).

10. A circuit breaker, characterized in that: The insulating rod includes the built-in damping oil as described in any one of claims 1-9, and the insulating rod is connected to the arc-extinguishing chamber for closing and opening operations.

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