Transformer iron core anti-vibration device

Abstract

The utility model relates to the technical field of oil-immersed transformers, in particular to a transformer iron core shockproof device which comprises an oil tank bottom plate and an iron core base located above the oil tank bottom plate, a piston cylinder is fixedly installed on the oil tank bottom plate, and a connecting rod is installed on the iron core base. The piston is movably arranged in the piston cylinder, the bottom of the piston is connected with the piston cylinder through an elastic piece, the piston comprises a clamping plug coaxially fixed to the connecting rod, a rotating plug is arranged in the middle of the clamping plug and rotationally connected with the clamping plug, a plurality of first through holes are annularly formed in the clamping plug, and a plurality of second through holes are annularly formed in the rotating plug. The rotating plug can adjust the overlap ratio of the first through hole and the second through hole through rotation. By changing the overlap ratio of the first through hole and the second through hole, the hole diameter through which hydraulic oil passes is changed, the flowing resistance of the hydraulic oil is increased, vibration can be better relieved, loads are shared, and the spring is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-immersed transformers, in particular to a transformer core shockproof device. Background Art

[0002] The traditional connection device between the transformer oil tank and the transformer mostly adopts positioning pin connection. This connection structure has simple function and no shock absorption effect. When the transformer is installed, it is pressed by the gravity of the iron core, and the iron core base is directly pressed and contacted with the bottom plate of the oil tank. The vibration generated when the transformer is running in the oil tank will be transmitted to the bottom plate of the oil tank through the positioning pins, causing the entire oil tank body to vibrate, and then cause the vibration of each fixed connection structure of the transformer. The long-term accumulation of vibration will increase the failure rate of the transformer and increase the safety hazards of the transformer operation. It will also cause the sealing bolts of the oil tank body to loosen, causing the transformer to leak oil and cause environmental pollution.

[0003] In the prior art, a connection device between a transformer oil tank and a transformer is described in the utility model patent with Chinese patent application number 202122362507.X, which includes a plurality of buffer components respectively arranged between the corners of the oil tank bottom plate and the corners of the iron core base of the transformer. The buffer component includes a round tube fixedly mounted on the oil tank bottom plate and a tubular support rod fixedly mounted on the iron core base. The lower end of the support rod extends into the round tube, and a spring is arranged between the bottom of the support rod and the bottom of the round tube. The support rod and the round tube are cooperated to form a limiting structure.

[0004] This device only consumes the kinetic energy of vibration during the vibration transmission process through the spring to play the role of buffering and shock absorption. The method is relatively simple and the effect is not good. Because the stiffness and damping characteristics of the spring are fixed, when facing a large vibration load, a single spring may be damaged due to its inability to consume the vibration load. Summary of the invention

[0005] The technical problem to be solved by the utility model is to design a transformer core shockproof device, which has a better shock-absorbing effect by adopting an elastic member to absorb shock while adding liquid pressure to assist in shock absorption.

[0006] In order to solve the above technical problems, the transformer core shockproof device of the utility model includes an oil tank bottom plate and an iron core base located above the oil tank bottom plate, a piston cylinder is fixedly installed on the oil tank bottom plate, and a connecting rod is installed on the iron core base. It is characterized in that a piston is installed at the bottom end of the connecting rod, the piston is movably arranged in the piston cylinder, the bottom of the piston is connected to the piston cylinder through an elastic member, the piston includes a clamping plug coaxially fixed with the connecting rod, a rotating plug is arranged in the middle of the clamping plug, the rotating plug is rotatably connected to the clamping plug, the clamping plug has a plurality of first through holes arranged in an annular shape, the rotating plug has a plurality of second through holes arranged in an annular shape, and the rotating plug can adjust the overlap degree of the first through holes and the second through holes by rotation.

[0007] Preferably, a guide pin is fixed to the outer circumferential wall of the rotating plug, and the guide pin is arranged in a groove, and the groove is opened on the inner wall of the piston cylinder.

[0008] Preferably, the elastic member is a spring, the upper end of the spring is fixedly connected to the bottom of the clamping plug, and the lower end of the spring is fixedly connected to the bottom of the piston cylinder.

[0009] Preferably, a piston cylinder cover is installed at the upper end of the piston cylinder, a third through hole is opened in the middle of the iron core base, and the connecting rod is slidably arranged in the third through hole.

[0010] Preferably, when the guide pin is located in the middle of the groove, the overlap between the first through hole and the second through hole is the largest, and when the guide pin is located at the end of the groove, the overlap between the first through hole and the second through hole is the smallest.

[0011] Preferably, the lower end of the connecting rod is threadedly connected to the piston, a nut is provided above the core base, and the upper end of the connecting rod extends out of the through hole on the core base and is fixedly connected to the nut.

[0012] Preferably, the outer wall of the connecting rod is sleeved with a supporting ear plate, and the supporting ear plate is arranged at the bottom of the core base.

[0013] Preferably, the piston cylinder cover is threadedly connected to the piston cylinder, and an opening for the connecting rod to pass through is provided at the center of the piston cylinder cover.

[0014] In summary, the beneficial effects of the present invention are:

[0015] ① The spring converts kinetic energy into elastic potential energy and releases it slowly during vibration transmission, which can effectively reduce the displacement caused by transformer shaking and play a great role in shock absorption and buffering; the piston structure plays an auxiliary role in shock absorption. By setting the first through hole and the second through hole, the flow of hydraulic oil can play a role in the movement of the piston. In this process, mechanical energy is converted into heat energy, consuming the energy brought by impact or vibration, and achieving a damping effect.

[0016] ② By changing the overlap between the first through hole and the second through hole, the aperture through which the hydraulic oil passes is changed, and the flow resistance of the hydraulic oil is increased, thereby increasing the damping force generated. After this setting, even if subjected to strong vibrations, the damping force on the up and down movement of the piston will become greater and greater, which can better reduce vibrations and share loads, thereby protecting the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 This is a structural schematic diagram of a transformer core shockproof device of the utility model;

[0019] Figure 2 for Figure 1 A local enlarged view of point A;

[0020] Figure 3 It is a schematic diagram of the cooperation between the piston and the piston cylinder;

[0021] Figure 4 It is a schematic diagram of the cooperation between the rotating plug and the clamping plug.

[0022] In the figure: 1-oil tank bottom plate; 2-iron core base; 10-piston cylinder; 20-connecting rod; 21-piston; 210-clamping plug; 211-rotating plug; 212-first through hole; 213-second through hole; 22-guide pin; 23-groove; 30-spring; 40-third through hole; 50-nut; 60-support ear plate. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0025] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0028] See attached Figure 1-4 The utility model discloses a transformer core anti-vibration device, which structure includes an oil tank bottom plate 1 and an iron core base 2 located above the oil tank bottom plate 1, a piston cylinder 10 is fixedly installed on the oil tank bottom plate 1 by welding, a connecting rod 20 is installed on the iron core base 2, a piston 21 is installed at the bottom end of the connecting rod 20, the piston 21 is movably arranged in the piston cylinder 10 and can move up and down along the piston cylinder 10, the bottom of the piston 21 is connected to the piston cylinder 10 through an elastic member, the piston 21 includes a clamping plug 210 coaxially fixed with the connecting rod 20, a rotating plug 211 is arranged in the middle of the clamping plug 210, the rotating plug 211 is rotatably connected to the connecting rod 20, the clamping plug 210 is annularly provided with a plurality of first through holes 212, the rotating plug 211 is annularly provided with a plurality of second through holes 213, and the rotating plug 211 can adjust the overlap degree of the first through holes 212 and the second through holes 213 by rotation.

[0029] Specifically, when the guide pin 22 is located at the middle of the groove 23, the overlap between the first through hole 212 and the second through hole 213 is the largest, and when the guide pin 22 is located at the end of the groove 23, the overlap between the first through hole 212 and the second through hole 213 is the smallest.

[0030] The piston cylinder 10 is filled with hydraulic oil.

[0031] As a further explanation of this embodiment, two guide pins 22 are fixed to the outer circumferential wall of the rotating plug 211, and the two guide pins 22 are arranged symmetrically about the central axis of the rotating plug 211. The guide pins 22 are configured in the groove 23 and slide along the groove 23, and the groove 23 is opened on the inner wall of the piston cylinder 10. The groove 23 is arranged from top to bottom, along the inner wall of the piston cylinder 10 and tilted counterclockwise.

[0032] As a further explanation of this embodiment, the elastic member is a spring 30, the upper end of the spring 30 is connected to the bottom of the piston 21, and the lower end of the spring 30 is connected to the bottom of the piston cylinder 10. The bottom of the piston cylinder 10 is welded above the fuel tank bottom plate 1, which plays a positioning role for the entire support structure, separates the spring 30 from the fuel tank bottom plate 1, prevents the spring 30 from directly contacting the fuel tank bottom plate 1, and prevents the spring 30 from causing wear to the fuel tank bottom plate 1 due to displacement during the expansion and contraction process, thereby isolating and protecting the fuel tank bottom plate 1.

[0033] As a further explanation of this embodiment, a piston cylinder cover 11 is fixedly mounted on the upper end of the piston cylinder 10 through threaded sealing, and an opening for the connecting rod 20 to pass through is provided at the center of the piston cylinder cover 11 .

[0034] As a further explanation of this embodiment, a third through hole 40 is provided in the middle of the core base 2, and the connecting rod 20 is slidably disposed in the third through hole 40. The connecting rod 20 and the third through hole 40 are slidably sealed.

[0035] As a further explanation of this embodiment, the lower end of the connecting rod 20 is threadedly connected to the piston 21. Specifically, an external thread is provided at the lower part of the connecting rod 20, and a threaded hole matching the external thread is provided at the central column of the clamping plug 210 of the piston 21. A nut 50 is provided above the core base 2, and the upper end of the connecting rod 20 extends out of the through hole on the core base 2 and is fixedly connected to the nut 50.

[0036] As a further explanation of this embodiment, the outer wall of the connecting rod 20 is provided with a support ear plate 60, and the support ear plate 60 is arranged at the bottom of the core base 2. The support ear plate 60 can support the core base 2, so that the pressure of the core base 2 acts on the connecting rod 20, and does not directly contact the oil tank bottom plate 1, thereby reducing the transmission of vibration when the transformer is running.

[0037] The working principle of the utility model is as follows: initially, the guide pin 22 is in the middle of the groove 23. When vibration occurs, the piston 21 will move up and down accordingly. First, the spring 30 converts kinetic energy into elastic potential energy and releases it slowly during the vibration transmission process, which can effectively reduce the displacement caused by the shaking of the transformer and play a great shock-absorbing and buffering role.

[0038] For example, when the core base 2 vibrates downward, the piston 21 will move downward, and the hydraulic oil in the piston cylinder 10 located at the lower part of the piston 21 will flow through the first through hole 212 annularly opened in the clamping plug 210 and the second through hole 213 annularly opened in the rotating plug 211, which will produce a large pressure loss along the way, thereby forming a pressure difference at both ends of the piston 21. The hydraulic oil needs to overcome this pressure difference to flow. In this process, mechanical energy is converted into heat energy, consuming the energy brought by impact or vibration, and achieving a damping effect.

[0039] When the piston 21 moves downward, the guide pin 22 moves along the guide surface of the groove 23, driving the rotating plug 211 to rotate, so that the overlap between the first through hole 212 and the second through hole 213 gradually decreases, that is, the diameter of the hole through which the hydraulic oil flows becomes smaller, the greater the flow resistance of the hydraulic oil, and thus the greater the damping force generated.

[0040] Similarly, when the piston 21 moves upward, the guide pin 22 also moves along the guide surface of the groove 23, driving the rotating plug 211 to rotate, so that the overlap between the first through hole 212 and the second through hole 213 gradually decreases, that is, the aperture through which the hydraulic oil flows can be made smaller, the greater the flow resistance of the hydraulic oil, and the greater the damping force generated. After such a setting, even if it is subjected to strong vibration, the damping force on the downward movement of the piston 21 will become greater and greater, which can better reduce the vibration and share the load, and protect the spring 30.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, multiple improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A transformer core anti-vibration device, comprising an oil tank bottom plate (1) and an iron core base (2) located above the oil tank bottom plate, a piston cylinder (10) being fixedly mounted on the oil tank bottom plate (1), and a connecting rod (20) being mounted on the iron core base (2), characterized in that: A piston (21) is installed at the bottom end of the connecting rod (20). The piston (21) is movably arranged in the piston cylinder (10). The bottom of the piston (21) is connected to the piston cylinder (10) through an elastic member. The piston (21) includes a clamping plug (210) coaxially fixed with the connecting rod (20). A rotating plug (211) is arranged in the middle of the clamping plug (210). The rotating plug (211) is rotatably connected to the clamping plug (210). The clamping plug (210) is provided with a plurality of first through holes (212) in an annular shape. The rotating plug (211) is provided with a plurality of second through holes (213) in an annular shape. The rotating plug (211) can adjust the overlap between the first through holes (212) and the second through holes (213) by rotating.

2. The transformer core anti-vibration device according to claim 1, characterized in that: A guide pin (22) is fixed to the outer circumferential wall of the rotating plug (211), and the guide pin (22) is arranged in a groove (23). The groove (23) is opened on the inner wall of the piston cylinder (10).

3. The transformer core vibration protection device according to claim 2, characterized in that: The elastic member is a spring (30), the upper end of the spring (30) is fixedly connected to the bottom of the clamping plug (210), and the lower end of the spring (30) is fixedly connected to the bottom of the piston cylinder (10).

4. The transformer core vibration protection device according to claim 3, characterized in that: A piston cylinder cover (11) is installed at the upper end of the piston cylinder (10), a third through hole (40) is provided in the middle of the iron core base (2), and the connecting rod (20) is slidably arranged in the third through hole (40).

5. The transformer core vibration protection device according to claim 2, characterized in that: When the guide pin (22) is located in the middle of the groove (23), the overlap between the first through hole (212) and the second through hole (213) is the largest; when the guide pin (22) is located at the end of the groove (23), the overlap between the first through hole (212) and the second through hole (213) is the smallest.

6. The transformer core vibration protection device according to claim 1, characterized in that: The lower end of the connecting rod (20) is threadedly connected to the piston (21), a nut (50) is arranged above the iron core base (2), and the upper end of the connecting rod (20) extends out of a through hole on the iron core base (2) and is fixedly connected to the nut (50).

7. The transformer core vibration protection device according to claim 1, characterized in that: The outer wall of the connecting rod (20) is sleeved with a supporting ear plate (60), and the supporting ear plate (60) is arranged at the bottom of the iron core base (2).

8. The transformer core vibration protection device according to claim 4, characterized in that: The piston cylinder cover (11) is threadedly connected to the piston cylinder (10), and an opening for the connecting rod (20) to pass through is provided at the center of the piston cylinder cover (11).

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