Buffer oil cylinder for intelligent circuit breaker

Abstract

The buffering oil cylinder comprises a buffering cylinder barrel, a convex cover and an annular cover are fixed to the upper surface of the buffering cylinder barrel, positioning grooves are formed in the inner side of the convex cover and the inner side of the annular cover to be connected with a sealing sleeve in a clamped mode, and a piston rod is slidably connected to the inner side surface of the sealing sleeve. A piston block is arranged on the lower surface of the piston rod, the piston block is fixedly connected to the lower surface of the piston rod, a first positioning groove and a second positioning groove are formed in the lower surface of the piston block, a first pressure spring is fixedly connected to the inner side surface of the first positioning groove, and a second pressure spring is fixed to the inner side surface of the second positioning groove; a cavity is formed in the piston block, an elastic extrusion sliding plate is adopted for supporting, hydraulic oil can be pressed into the cavity when compressed and can be extruded and popped out when rising and rebounding, the problem that the hydraulic oil cannot flow back cannot be caused, the buffering performance is improved, and the buffering supporting force is improved.

Description

Technical Field

[0001] The utility model relates to the field of buffer oil cylinders for circuit breakers, and more specifically to a buffer oil cylinder for intelligent circuit breakers. Background Art

[0002] Universal circuit breakers are mainly used to distribute electrical energy and protect lines and power equipment from overload, short circuit, single-phase grounding (leakage) and other faults. The operating mechanism of the universal circuit breaker mainly realizes the rapid closing and opening of the circuit breaker. For the operating mechanism, the speed of the opening and the magnitude of the rebound force will affect its performance and life. It generally includes a cylinder, a piston, a piston rod and a cylinder head. The cylinder and the cylinder head form a closed cylinder for accommodating the piston. The piston is arranged at one end of the piston rod, and the piston rod extends out of the cylinder head. A reset spring is arranged at the bottom of the cylinder, and the cylinder is also filled with buffer oil. The working process is that the piston rod is pressed downward, and the buffer oil flows from the gap between the piston and the cylinder into the upper part of the cylinder to achieve a buffering effect. After the pressure on the piston rod is removed, the reset spring pushes the piston upward, and the piston and the piston rod move upward together to achieve the reset function. The flow rate of the existing oil buffer cannot be adjusted, and the reset is not flexible. Therefore, it is necessary to change the oil buffer piston structure and improve the oil channel cross section so that the oil buffer downward pressure and reset speed can be adjusted to meet the circuit breaker performance requirements;

[0003] For example, a buffer oil cylinder for a universal circuit breaker disclosed in the prior art patent CN203702970U includes a cylinder barrel, a piston, a piston rod and a cylinder cover. The piston is arranged in a closed cavity formed by the cylinder barrel and the cylinder cover. There is a gap between the outer diameter of the piston and the inner diameter of the cylinder barrel. The piston rod extends out of the cylinder cover. A reset spring is arranged at the bottom of the cylinder barrel. The piston has a hollow inner cavity. The piston has an opening on one side facing the cylinder bottom of the cylinder barrel. The outer wall of the piston is provided with at least one concave area. The concave area of ​​the piston is provided with at least one through hole connected to the hollow inner cavity of the piston. The buffer oil cylinder for a universal circuit breaker of the utility model has a simple structure, a novel concept, and is easy to manufacture. On the basis of the existing buffer oil cylinder, the flow path of the buffer oil is improved to achieve the beneficial effects of adjustable buffer pressure and reset speed, thereby achieving better satisfaction of the circuit breaker performance requirements.

[0004] According to the above patent, when the piston block compresses the bottom spring and hydraulic oil, the hydraulic oil is diverted through the through hole for buffering during compression. However, when rising and resetting, the oil in the through hole is inconvenient to flow back and out, which affects the elastic performance and buffering performance, and the buffering support force is poor. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a buffer oil cylinder for an intelligent circuit breaker. By arranging a cavity inside the piston block and adopting an elastic extrusion slide plate for support, the hydraulic oil can be pressed into the cavity when compressed, and can also be squeezed out when rising and rebounding, which will not cause the problem of hydraulic oil not being able to flow back, and improves the buffering performance and the buffering supporting force.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] The buffer oil cylinder for an intelligent circuit breaker comprises a buffer cylinder barrel, wherein a convex cover and a ring cover are fixed to the upper surface of the buffer cylinder barrel respectively, a positioning groove is arranged inside the convex cover and the ring cover and a sealing sleeve is clamped, the inner surface of the sealing sleeve is slidably connected with a piston rod, a piston block is arranged on the lower surface of the piston rod, the piston block is fixedly connected to the lower surface of the piston rod, a first positioning groove and a second positioning groove are arranged on the lower surface of the piston block, a first compression spring is fixedly connected to the inner surface of the first positioning groove, a second compression spring is fixed to the inner surface of the second positioning groove, a convex rubber plate is filled on the inner surface of the second positioning groove, an extrusion slide plate is fixed to the lower surface of the convex rubber plate, a spherical bulging shell structure is arranged on the surface of the convex rubber plate, a cavity is arranged inside the piston block and an elastic extrusion slide plate is adopted for support, when the hydraulic oil is compressed, it can be pressed into the cavity, and when it rises and rebounds, it can also be squeezed out, so that the problem of hydraulic oil not being able to flow back is not caused, and the buffering performance is improved, and the buffering supporting force is improved.

[0008] Furthermore, the outer surface of the extrusion slide plate is fitted to the inner surface of the second positioning groove, and the extrusion slide plate adopts a circular plate structure.

[0009] Furthermore, the outer surface of the piston block is fitted to the inner surface of the buffer cylinder, the outer surface of the piston block is provided with a positioning ring groove, and a rubber sealing ring is installed inside the positioning ring groove.

[0010] Furthermore, the rubber sealing ring is a rubber ring, and its outer surface is tightly fitted on the inner surface of the buffer cylinder.

[0011] Furthermore, the convex cover and the ring cover are fixed to the upper surface of the buffer cylinder by bolts, and four groups of bolts are distributed and fixed on the surface of the buffer cylinder.

[0012] Furthermore, the bolt is a hexagon socket bolt, and the upper end of the bolt is embedded in the surface of the ring cover.

[0013] Furthermore, the inner surfaces of the convex cover and the ring cover are provided with a cross-shaped ring groove, and the sealing sleeve is a cross-shaped tube head structure, and its outer surface is clamped and fixed in the cross-shaped ring groove.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] By setting a cavity inside the piston block and using an elastic extrusion slide plate for support, the hydraulic oil can be pressed into the cavity when compressed, and can also be squeezed out when rising and rebounding, which will not cause the problem of hydraulic oil not being able to flow back, and will improve the buffering performance and the buffering support force.

[0016] The outer surface of the extrusion slide is fitted to the inner surface of the second positioning groove. The extrusion slide adopts a circular plate structure and can fit the sliding support. When the hydraulic oil is squeezed on the surface of the extrusion slide, the extrusion slide can rise and shrink, compressing the second compression spring. When compressed to the bottom, the pressure is too large, and the spherical bulging shell of the convex rubber plate can be supported on the upper end of the second positioning groove. When compressed, it can provide buffer support. When resetting, it is ensured that the second compression spring pops out of the extrusion slide, which is convenient for popping out the hydraulic oil to reset, and the compression support is stable.

[0017] The outer surface of the piston block is fitted to the inner surface of the buffer cylinder, and a positioning ring groove is provided on the outer surface of the piston block. A rubber sealing ring is installed inside the positioning ring groove to facilitate the installation of the sealing ring;

[0018] The rubber sealing ring adopts a rubber ring, the outer surface of which is tightly fitted on the inner surface of the buffer cylinder, and when sliding in close contact, it can be squeezed on the inner wall to seal;

[0019] The convex cover and the ring cover are fixed to the upper surface of the buffer cylinder by bolts. Four groups of bolts are distributed and fixed on the surface of the buffer cylinder. The bolts are hexagon socket bolts, and their upper ends are embedded in the surface of the ring cover, which is stable and convenient to install.

[0020] The inner surfaces of the convex cover and the ring cover are provided with a cross-shaped ring groove, and the sealing sleeve is a cross-shaped pipe head structure, and the outer surface thereof is clamped and fixed in the cross-shaped ring groove, so that the sealing sleeve is easy to install and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a top view of the entire structure of the utility model;

[0023] Figure 3 This is a view of the piston block and piston rod of the utility model;

[0024] Figure 4 This is a view of the extruded skateboard and the convex rubber plate of the utility model.

[0025] Description of the numbers in the figure:

[0026] 1 buffer cylinder, 2 convex cover, 3 ring cover, 4 sealing sleeve, 5 piston rod, 6 piston block, 7 first positioning groove, 8 second positioning groove, 9 first compression spring, 10 second compression spring, 11 convex rubber plate, 12 extrusion slide plate, 60 rubber sealing ring, 23 bolts. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example 1

[0029] See also Figure 1-4 , a buffer oil cylinder for an intelligent circuit breaker, comprising a buffer cylinder barrel 1, a convex cover 2 and a ring cover 3 are respectively fixed on the upper surface of the buffer cylinder barrel 1, a positioning groove is arranged inside the convex cover 2 and the ring cover 3, and a sealing sleeve 4 is clamped, a piston rod 5 is slidably connected to the inner surface of the sealing sleeve 4, a piston block 6 is arranged on the lower surface of the piston rod 5, the piston block 6 is fixedly connected to the lower surface of the piston rod 5, a first positioning groove 7 and a second positioning groove 8 are arranged on the lower surface of the piston block 6, a first compression spring 9 is fixedly connected to the inner surface of the first positioning groove 7, and a second compression spring 9 is fixedly connected to the inner surface of the second compression spring 9. A second compression spring 10 is fixed to the inner surface of the positioning groove 8, a convex rubber plate 11 is filled on the inner surface of the second positioning groove 8, an extrusion slide plate 12 is fixed to the lower surface of the convex rubber plate 11, and a spherical bulging shell structure is provided on the surface of the convex rubber plate 11 (by providing a cavity inside the piston block 6 and adopting an elastic extrusion slide plate 12 for support, when the hydraulic oil is compressed, it can be pressed into the cavity, and can also be squeezed out when it rises and rebounds, which will not cause the problem of hydraulic oil not being able to flow back, and improves the buffering performance and the buffering supporting force);

[0030] The outer surface of the extrusion slide 12 fits the inner surface of the second positioning groove 8. The extrusion drawing board 12 adopts a circular plate structure and can fit the sliding support. When the piston block 6 is squeezed downward, the hydraulic oil and the first compression spring 9 can be compressed. When the hydraulic oil compression pressure is large, it can be squeezed on the extrusion slide 12. The extrusion slide 12 can rise and shrink, compressing the second compression spring 10. When compressed to the bottom, the pressure is too large, and the spherical bulging shell of the convex rubber plate 11 can be supported by the elastic support at the upper end of the second positioning groove 8. It can be buffered during compression. When resetting, it is ensured that the second compression spring 10 pops out of the extrusion slide 12, which is convenient for popping out the hydraulic oil to reset, and the compression support is stable;

[0031] The outer surface of the piston block 6 is fitted to the inner surface of the buffer cylinder 1. The outer surface of the piston block 6 is provided with a positioning ring groove. A rubber sealing ring 60 is installed inside the positioning ring groove. The rubber sealing ring 60 is a rubber ring, and its outer surface is tightly fitted to the inner surface of the buffer cylinder 1. It is easy to install and can be slid and sealed.

[0032] The convex cover 2 and the ring cover 3 are fixed to the upper surface of the buffer cylinder 1 by bolts 23. The bolts 23 are fixed to the surface of the buffer cylinder 1 in four groups. The bolts 23 are hexagon socket bolts, and the upper ends of the bolts 23 are embedded in the surface of the ring cover 3, which is stable and convenient to install.

[0033] A cross-shaped ring groove is arranged on the inner surface of the convex cover 2 and the ring cover 3, and the sealing sleeve 4 is a cross-shaped pipe head structure, and its outer surface is clamped and fixed in the cross-shaped ring groove. The sealing sleeve 4 is easy to install and replace. When replacing, take out the bolt 23, remove the ring cover 3, and pull out the sealing sleeve 4 to replace it. When in use, the sealing sleeve 4 is a wear-resistant rubber sleeve, and the inner wall fits the outer surface of the piston rod 5, which can fit the piston rod 5 to squeeze and seal, thereby increasing the sealing performance during use.

[0034] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A buffer oil cylinder for an intelligent circuit breaker, comprising a buffer cylinder barrel (1), characterized in that: A convex cover (2) and a ring cover (3) are fixed to the upper surface of the buffer cylinder (1), respectively; positioning grooves are arranged on the inner sides of the convex cover (2) and the ring cover (3) and are clamped with a sealing sleeve (4); the inner surface of the sealing sleeve (4) is slidably connected with a piston rod (5); a piston block (6) is arranged on the lower surface of the piston rod (5); the piston block (6) is fixedly connected to the lower surface of the piston rod (5); a first positioning groove (7) and a second positioning groove (8) are arranged on the lower surface of the piston block (6); a first compression spring (9) is fixedly connected to the inner surface of the first positioning groove (7); a second compression spring (10) is fixedly fixed to the inner surface of the second positioning groove (8); a convex rubber plate (11) is loaded on the inner surface of the second positioning groove (8); an extrusion slide plate (12) is fixedly arranged on the lower surface of the convex rubber plate (11); and a spherical bulging shell structure is arranged on the surface of the convex rubber plate (11).

2. The buffer oil cylinder for intelligent circuit breaker according to claim 1, characterized in that: The outer surface of the extrusion slide plate (12) is fitted onto the inner surface of the second positioning groove (8), and the extrusion slide plate (12) adopts a circular plate structure.

3. The buffer oil cylinder for intelligent circuit breaker according to claim 1, characterized in that: The outer surface of the piston block (6) is fitted on the inner surface of the buffer cylinder (1), and a positioning ring groove is provided on the outer surface of the piston block (6), and a rubber sealing ring (60) is installed inside the positioning ring groove.

4. The buffer oil cylinder for intelligent circuit breaker according to claim 3 is characterized in that: The rubber sealing ring (60) is a rubber ring, the outer surface of which is tightly fitted on the inner surface of the buffer cylinder (1).

5. The buffer oil cylinder for intelligent circuit breaker according to claim 1, characterized in that: The convex cover (2) and the ring cover (3) are fixed to the upper surface of the buffer cylinder (1) by means of bolts (23), and the bolts (23) are fixed to the surface of the buffer cylinder (1) in four groups.

6. The buffer oil cylinder for intelligent circuit breaker according to claim 5, characterized in that: The bolt (23) is a hexagon socket bolt, the upper end of which is embedded in the surface of the ring cover (3).

7. The buffer oil cylinder for intelligent circuit breaker according to claim 1, characterized in that: The inner surfaces of the convex cover (2) and the ring cover (3) are provided with a cross-shaped annular groove, and the sealing sleeve (4) is a cross-shaped pipe head structure, and its outer surface is clamped and fixed in the cross-shaped annular groove.

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