Connecting structure for oil tank and iron core of transformer

Abstract

The utility model relates to the technical field of oil-immersed transformers, in particular to a transformer oil tank and iron core connecting structure 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, a piston cylinder cover is installed at the upper end of the piston cylinder, and a through hole is formed in the middle of the iron core base. A connecting rod is vertically arranged in the through hole, the lower end of the connecting rod penetrates through the piston cylinder cover and extends downwards into the piston cylinder, a horizontally-arranged piston is installed at the lower end of the connecting rod, an elastic piece is arranged between the bottom of the piston and the bottom of the piston cylinder, and a first oil hole and a second oil hole are formed in the side wall of the piston cylinder from top to bottom. The up-and-down movement range of the piston is the distance between the highest point and the lowest point of the hole diameters of the first oil hole and the second oil hole in the vertical direction. According to the device, the elastic piece is adopted for damping, and meanwhile liquid pressure is added for assisting damping, so that the damping effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-immersed transformers, in particular to a connection structure between a transformer oil tank and an iron core. Background Art

[0002] The conventional connection device between the transformer oil tank and the transformer generally adopts a connection structure: a positioning pin 11 is welded on the oil tank bottom plate 10 inside the transformer oil tank, and the transformer core base 12 has a positioning circular hole 13, and the positioning pin 11 passes through the positioning circular hole 13 and is connected with the core base 12. Figure 1 As shown. Since the structure only uses the positioning pins 11 to penetrate and connect with the core base 12, it can only provide the horizontal positioning function of the core base 12, and the core base 12 can move freely in the vertical direction. The connection structure is simple in function and has no shock-absorbing effect. When the transformer is installed, the core base is directly pressed in contact with the bottom plate of the oil tank under the pressure of the iron core gravity. 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 causing 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 introduced 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, and 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 an elastic member is arranged between the bottom of the support rod and the bottom of the round tube, and the support rod and the round tube cooperate to set a limited position structure. This device only consumes the kinetic energy of vibration during the vibration transmission process through the elastic member to play the role of buffering and shock absorption, and the method is relatively simple and the effect is not good; and there may be a situation where the stretching and contraction process of the spring and the vibration of the transformer are superimposed at a certain moment, thereby aggravating the vibration at that moment. Summary of the invention

[0004] The technical problem to be solved by the utility model is to design a connection structure between a transformer oil tank and an iron core. The device adopts an elastic member to reduce shock while adding liquid pressure to assist in reducing shock, so the shock reduction effect is better.

[0005] In order to solve the above technical problems, the connection structure between the transformer oil tank and the iron core 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, a piston cylinder cover is installed on the upper end of the piston cylinder, a through hole is opened in the middle of the iron core base, a connecting rod is vertically arranged in the through hole, the lower end of the connecting rod passes through the piston cylinder cover and extends downward into the piston cylinder, a horizontally arranged piston is installed at the lower end of the connecting rod, an elastic member is arranged between the bottom of the piston and the bottom of the piston cylinder, a first oil hole and a second oil hole are opened on the side wall of the piston cylinder from top to bottom, and the range of up and down movement of the piston is the distance from the highest point to the lowest point of the aperture of the first oil hole and the second oil hole in the vertical direction.

[0006] Preferably, when the second oil hole is completely covered by the circumference of the piston, the piston stops moving.

[0007] Preferably, the first oil hole is arranged near the piston cylinder cover, and the second oil hole is arranged near the bottom of the piston cylinder.

[0008] Preferably, a plurality of the first oil holes and the second oil holes may be provided along the circumference of the piston cylinder.

[0009] Preferably, the elastic member is a spring, the upper end of the spring is connected to the bottom of the piston, and the lower end of the spring is connected to the bottom of the piston cylinder.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] In summary, the beneficial effects of the present invention are:

[0014] (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 opening two oil holes on the outer wall of the piston sealing cylinder, the liquid pressure can play a role in the movement of the piston during the movement of the piston. During the vibration of the transformer, if a conventional single spring shock-absorbing device is used, the stretching and contraction process of the spring may overlap with the vibration of the transformer at a certain moment, thereby intensifying the vibration at that moment. The use of liquid pressure assistance can effectively reduce the impact on the transformer and the box when such a situation occurs.

[0015] (2) By separating the core base from the oil tank bottom plate and eliminating direct contact, wear on the core base and the tank bottom plate is eliminated, the transmission of vibration during transformer operation is reduced, and transformer failure damage caused by displacement is reduced.

[0016] (3) The structure has a vertical limit function. When the piston covers the second oil hole, the liquid pressure on the piston will increase with the increase of the covering area. When the piston completely covers the second oil hole, the pressure is no longer released to the outside of the cylinder body, but is borne by the transformer oil in the cylinder. Since the transformer oil is not easily compressed within the vibration fluctuation range of the transformer weight, the piston will be stopped. Therefore, the upper and lower oil holes of the cylinder body cooperate with the piston to play a limit role, limiting the further displacement of the core base in the vertical direction, reducing the failure rate of the transformer, improving the safety and stability of the transformer, and improving the economic benefits.

[0017] (4) This structure reduces environmental pollution, reduces vibration of the oil tank body, ensures the stability of the various fixed connection structures of the transformer, avoids the loosening of the sealing bolts of the oil tank body due to long-term accumulation of vibration, effectively reduces the occurrence of transformer oil leakage, and prevents environmental pollution caused by oil leakage.

[0018] (5) The structure is highly stable, simple, and easy to install and maintain. It can effectively reduce the failure rate of the transformer, reduce the number of maintenance personnel due to transformer failure, improve the stability of transformer operation, and save the overall cost of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 It is a structural schematic diagram of a connection device between a transformer oil tank and an iron core base in the prior art;

[0021] Figure 2 This is a structural schematic diagram of a connection structure between a transformer oil tank and an iron core according to the utility model;

[0022] Figure 3 for Figure 2 A partial enlarged view of point A.

[0023] In the figure: the oil tank bottom plate 10, the positioning pin 11, the core base 12, the positioning circular hole 13, the piston cylinder 20, the piston cylinder cover 22, the piston 21, the first oil hole 23, the second oil hole 24, the spring 30, the connecting rod 40, the nut 41, and the supporting ear plate 42. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0029] See attached Figure 2 , Figure 3The utility model discloses a connection structure between a transformer oil tank and an iron core, the structure comprises an oil tank bottom plate 10 and an iron core base 12 located above the oil tank bottom plate 10, a piston cylinder 20 is fixedly mounted on the oil tank bottom plate 10, a piston cylinder cover 22 is mounted on the upper end of the piston cylinder 20, a through hole is provided in the middle of the iron core base 12, a connecting rod 40 is vertically arranged in the through hole, the lower end of the connecting rod 40 passes through the piston cylinder cover 22 and extends downward into the piston cylinder 20, a horizontally arranged piston 21 is mounted on the lower end of the connecting rod 40, an elastic member is provided between the bottom of the piston 21 and the bottom of the piston cylinder 20, a first oil hole 23 and a second oil hole 24 are provided on the side wall of the piston cylinder 20 from top to bottom, preferably, a plurality of the first oil holes 23 and the second oil holes 24 can be arranged along the circumference of the piston cylinder 20, and the range of up and down movement of the piston 21 is the distance from the highest point to the lowest point of the aperture of the first oil hole 23 and the second oil hole 24 in the vertical direction. No matter the transformer is shaken by external force or the transformer body is vibrated during operation, the elastic member can expand and contract in the vertical direction between the bottom of the piston 21 and the bottom of the piston cylinder 20 to play a shock-absorbing and buffering role. When vibration occurs, the piston 21 moves up and down in the piston cylinder 20 to release the pressure to the outside through the first oil hole 23 or the second oil hole 24 of the piston cylinder 20, thereby limiting the vertical movement of the transformer, reducing the influence of the transformer body vibration on the entire box structure and the fixed connection structure inside and outside the box, preventing the bolts from loosening, ensuring the stable operation of the transformer, reducing the risk of transformer oil leakage, and preventing environmental pollution.

[0030] Specifically, the first oil hole 23 is arranged near the piston cylinder cover 22, and the second oil hole 24 is arranged near the bottom of the piston cylinder 20. When the second oil hole 24 is completely covered by the circumference of the piston 21, the piston 21 stops moving. When the transformer vibrates during operation or is affected by external factors, the liquid pressure on the piston 21 is opposite to the vibration direction. When the piston 21 completely covers the second oil hole 24 of the piston cylinder 20, the pressure is no longer released outward through the second oil hole 24, and the liquid compression reaction force acts on the piston 21, which plays a limiting role.

[0031] 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 20. The bottom of the piston cylinder 20 is welded above the oil tank bottom plate 10, which plays a positioning role for the entire support structure, separates the spring 30 from the oil tank bottom plate 10, prevents the spring 30 from directly contacting the oil tank bottom plate 10, and prevents the spring 30 from causing wear to the oil tank bottom plate 10 due to displacement during the expansion and contraction process, thereby isolating and protecting the oil tank bottom plate 10.

[0032] As a further explanation of this embodiment, the lower end of the connecting rod 40 is threadedly connected to the piston 21, a nut 41 is provided above the core base 12, and the upper end of the connecting rod 40 extends out of the through hole on the core base 12 and is fixedly connected to the nut 41.

[0033] As a further explanation of this embodiment, the outer wall of the connecting rod 40 is provided with a support ear plate 42, and the support ear plate 42 is arranged at the bottom of the core base 12. The support ear plate 42 can support the core base 12, so that the pressure of the core base 12 acts on the connecting rod 40, and does not directly contact the oil tank bottom plate 10, thereby reducing the transmission of vibration when the transformer is running.

[0034] As a further explanation of this embodiment, the piston cylinder cover 22 is threadedly connected to the piston cylinder 20, and an opening for the connecting rod 40 to pass through is provided at the center of the piston cylinder cover 22.

[0035] The working principle of the utility model is as follows: when installing the transformer core, the connecting rod 40 is pre-through the central opening of the piston cylinder cover 22 and is threadedly connected to the piston 21, the bottom of the piston cylinder 20 is welded to the fixed position of the oil tank bottom plate 10, a spring 30 is placed at the bottom of the piston cylinder 20 and transformer oil is injected into the piston cylinder 20, the piston 21 and the connecting rod 40 are vertically placed in the piston cylinder 20, transformer oil is injected above the piston 21 to fill the inside of the piston cylinder 20, the piston cylinder cover 22 is tightened and fixed to the top of the piston cylinder 20 to form a complete piston structure; then the core and the core base 12 are installed, the connecting rod 40 is passed through the positioning through hole, the core base 12 is pressed on the supporting ear plate 42, and the portion of the upper end of the connecting rod 40 that exceeds the core base 12 is fixed to the core base 12 using a nut 41.

[0036] Then, a first oil hole 23 and a second oil hole 24 are opened on the side wall of the piston cylinder 20. During the downward movement of the piston 21, the transformer oil in the lower part of the cylinder is discharged from the second oil hole 24 under pressure, and the upper transformer oil is attracted inward from the first oil hole 23. The reaction force generated by the liquid movement gives the piston 21 an upward force; during the upward movement of the piston 21, the transformer oil in the upper part of the cylinder is discharged from the first oil hole 23 under pressure, and the lower transformer oil is attracted inward from the second oil hole 24. The reaction force generated by the liquid movement gives the piston 21 a downward force; under the action of this force, the vertical vibration transmitted between the transformer and the box is weakened. During the vibration of the transformer, a conventional single spring shock-absorbing device may have a situation where the stretching and contraction process of the spring and the transformer vibration are superimposed at a certain moment, thereby aggravating the vibration at that moment. The use of liquid pressure assistance can effectively reduce the impact on the transformer and the box when such a situation occurs.

[0037] When the piston 21 covers the second oil hole 24, the liquid pressure on the piston 21 will increase as the covering area increases. When the piston 21 completely covers the second oil hole 24, the pressure is no longer released to the outside of the cylinder body, but is borne by the transformer oil in the cylinder. Since the transformer oil is not easily compressed within the vibration fluctuation range of the transformer weight, the piston 21 will stop. Therefore, the first oil hole 23 and the second oil hole 24 of the cylinder body cooperate with the piston 21 to play a limiting role, limiting the further displacement of the core base 12 in the vertical direction, reducing the failure rate of the transformer, and improving the safety and stability of the transformer.

[0038] 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 connection structure between a transformer oil tank and an iron core, comprising an oil tank bottom plate (10) and an iron core base (12) located above the oil tank bottom plate (10), a piston cylinder (20) being fixedly mounted on the oil tank bottom plate (10), a piston cylinder cover (22) being mounted on the upper end of the piston cylinder (20), a through hole being provided in the middle of the iron core base (12), a connecting rod (40) being vertically arranged in the through hole, a lower end of the connecting rod (40) passing through the piston cylinder cover (22) and extending downward into the piston cylinder (20), characterized in that: A horizontally arranged piston (21) is installed at the lower end of the connecting rod (40); an elastic member is arranged between the bottom of the piston (21) and the bottom of the piston cylinder (20); a first oil hole (23) and a second oil hole (24) are opened from top to bottom on the side wall of the piston cylinder (20); and the range of up and down movement of the piston (21) is the distance from the highest point to the lowest point of the aperture of the first oil hole (23) and the second oil hole (24) in the vertical direction.

2. The connection structure between the transformer oil tank and the iron core according to claim 1, characterized in that: When the second oil hole (24) is completely covered by the circumference of the piston (21), the piston (21) stops moving.

3. The connection structure between the transformer oil tank and the iron core according to claim 2, characterized in that: The first oil hole (23) is arranged near the piston cylinder cover (22), and the second oil hole (24) is arranged near the bottom of the piston cylinder (20).

4. The connection structure between the transformer oil tank and the iron core according to claim 3, characterized in that: A plurality of the first oil holes (23) and the second oil holes (24) may be arranged along the circumference of the piston cylinder (20).

5. The connection structure between the transformer oil tank and the iron core according to claim 1, characterized in that: 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 (20).

6. The connection structure between the transformer oil tank and the iron core according to claim 1, characterized in that: The lower end of the connecting rod (40) is threadedly connected to the piston (21), a nut (41) is arranged above the iron core base (12), and the upper end of the connecting rod (40) extends out of a through hole on the iron core base (12) and is fixedly connected to the nut (41).

7. The connection structure between the transformer oil tank and the iron core according to claim 1, characterized in that: The outer wall of the connecting rod (40) is sleeved with a supporting ear plate (42), and the supporting ear plate (42) is arranged at the bottom of the iron core base (12).

8. The connection structure between the transformer oil tank and the iron core according to claim 1, characterized in that: The piston cylinder cover (22) is threadedly connected to the piston cylinder (20), and an opening for the connecting rod (40) to pass through is provided at the center of the piston cylinder cover (22).

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