Variable oil pressure oil immersed transformer

Abstract

The variable oil pressure oil immersed transformer comprises a transformer body, a motor, an impeller pump, a variable oil pressure assembly and a connecting pipe, radiating fin pipes are arranged on the periphery of the transformer body, the impeller pump is arranged on the top end face in the transformer body, and an oil suction opening of the impeller pump is immersed in oil liquid of the transformer body. An oil outlet of the impeller pump is communicated with an oil port in the top of the heat dissipation fin tube through the connecting pipe, an oil port in the bottom of the heat dissipation fin tube is communicated with an inner cavity of the transformer, and the variable oil pressure assembly is arranged in the middle of the connecting pipe and used for controlling oil entering the heat dissipation fin tube; the impeller pump is driven by the motor to suck hot oil at the top of the transformer, and then the hot oil is pumped into the heat dissipation fin tubes through the connecting tubes for heat dissipation, so that heat in the transformer is quickly conducted out for heat dissipation; when the oil temperature is low, the variable oil pressure assembly enables oil liquid to circulate in the transformer, and when the oil temperature is high, the variable oil pressure assembly enables the oil liquid to circulate in the heat dissipation fin pipes outside the transformer.

Description

Technical Field

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

[0002] An oil-immersed transformer uses oil as the main insulation means of the transformer and relies on oil as the cooling medium. When the oil-immersed transformer is working, the temperature of the transformer oil inside will increase accordingly. Currently, most transformers use a passive heat dissipation method, and the heat is mainly dissipated through the heat dissipation fin tubes on the outer wall of the transformer. The internal oil is in a static state. The oil temperature at the position of the heat dissipation fin tubes is relatively low, and the oil temperature at the position of the coil is relatively high, making it impossible for the transformer to quickly conduct the internal heat out. Moreover, when the transformer is operating at full load, the temperature of the transformer oil is also easily too high. Therefore, in order to solve the above problems, a variable oil pressure oil-immersed transformer is designed. Content of the Utility Model

[0003] Aiming at the deficiencies of the existing transformers, the purpose of the utility model is to provide a variable oil pressure oil-immersed transformer, which has the advantages of transformer oil circulation, oil pressure following temperature changes, etc.

[0004] To achieve the above purpose, a technical solution adopted by the utility model is: a variable oil pressure oil-immersed transformer, including a transformer, a motor, an impeller pump, a variable oil pressure component and a connecting pipe. The transformer is surrounded by heat dissipation fin tubes. An impeller pump is arranged on the top end surface inside the transformer. The oil suction port of the impeller pump is immersed in the transformer oil. The oil outlet of the impeller pump is communicated with the top oil port of the heat dissipation fin tubes through the connecting pipe. The bottom oil port of the heat dissipation fin tubes is communicated with the internal cavity of the transformer. The variable oil pressure component is arranged in the middle of the connecting pipe, and the variable oil pressure component is used to control the oil entering the heat dissipation fin tubes.

[0005] Preferably, the variable oil pressure component includes a T-shaped housing, a T-shaped arm, a valve plate and an expansion component. The T-shaped housing has a communicating cavity. One side of the communicating cavity is communicated with the connecting pipe communicating with the oil outlet of the impeller pump, and the other side of the communicating cavity is communicated with the connecting pipe communicating with the heat dissipation fin tubes. The bottom of the T-shaped housing has an overflow pipe, and the overflow pipe is communicated with the communicating cavity. The T-shaped arm has a vertical limb and a horizontal limb. The vertical limb slides along the axial direction of the overflow pipe. A valve plate for blocking the overflow pipe is arranged at the bottom of the horizontal limb. A valve plate for blocking the connecting pipe communicating with the heat dissipation fin tubes is arranged on one side of the horizontal limb. An expansion component is arranged in the overflow pipe, and the expansion component is used to drive the T-shaped arm to move.

[0006] Further preferably, the center of the overflow pipe also has a columnar sealing cavity extending axially.

[0007] Further preferably, the expansion assembly includes a piston, a spring and paraffin. The piston is axially and slidably connected in the cylindrical sealing cavity. The top surface of the piston is fixedly connected to the vertical limb of the T-shaped arm. Paraffin is provided in the cylindrical sealing cavity at the bottom end surface of the piston. The spring forces the piston to move downward.

[0008] The beneficial effects of the present utility model are as follows: 1. The hot oil at the top of the transformer is sucked by the impeller pump driven by the motor, and then pumped into the heat dissipation fin tubes through the connecting pipe for heat dissipation. During the whole pumping process, the transformer oil can circulate continuously, so as to quickly conduct the heat inside the transformer out for heat dissipation; 2. By arranging a variable oil pressure assembly in the middle of the connecting pipe, when the oil temperature is low, the variable oil pressure assembly allows the oil to circulate inside the transformer, so as to quickly balance the temperature of the transformer oil. When the oil temperature is high, the variable oil pressure assembly allows the oil to circulate in the external heat dissipation fin tubes of the transformer, so as to quickly reduce the temperature of the transformer oil. Description of the Drawings

[0009] Figure 1 is a sectional structural view of the present utility model;

[0010] Figure 2 is a sectional structural view of the variable oil pressure assembly of the present utility model in the state of low oil temperature;

[0011] Figure 3 is a sectional structural view of the variable oil pressure assembly of the present utility model in the state of high oil temperature. Detailed Embodiments

[0012] The following describes in detail the preferred embodiments of the present utility model with reference to the drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0013] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model.

[0014] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided with", "set" 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0015] Please refer to Figures 1 to 3 , the embodiments of the present utility model include:

[0016] A variable oil pressure oil-immersed transformer, including a transformer 1, a motor 2, an impeller pump 3, a variable oil pressure component 4 and a connecting pipe 9. The transformer 1 is surrounded by heat dissipation fin tubes 11. An impeller pump 3 is provided on the top end surface inside the transformer 1. The oil suction port of the impeller pump 3 is immersed in the oil of the transformer 1. The oil outlet of the impeller pump 3 is communicated with the top oil port of the heat dissipation fin tube 11 through the connecting pipe 9. The bottom oil port of the heat dissipation fin tube 11 is communicated with the internal cavity of the transformer 1. The variable oil pressure component 4 is arranged in the middle of the connecting pipe 9, and the variable oil pressure component 4 is used to control the oil flowing into the heat dissipation fin tube 11;

[0017] Preferably, the variable oil pressure component 4 includes a T-shaped housing 5, a T-shaped arm 6, a valve plate 7 and an expansion component 8. The T-shaped housing 5 has a communicating cavity 51 inside. One side of the communicating cavity 51 is communicated with the connecting pipe 9 that communicates with the oil outlet of the impeller pump 3. The other side of the communicating cavity 51 is communicated with the connecting pipe 9 that communicates with the heat dissipation fin tube 11. The bottom of the T-shaped housing 5 has an overflow pipe 52, and the overflow pipe 52 is communicated with the communicating cavity 51. The T-shaped arm 6 has a vertical limb 61 and a horizontal limb 62. The vertical limb 61 slides axially along the overflow pipe 52. A valve plate 7 for blocking the overflow pipe 52 is provided at the bottom of the horizontal limb 62. A valve plate 7 for blocking the connecting pipe 9 communicating with the heat dissipation fin tube 11 is provided on one side of the horizontal limb 62. An expansion component 8 is arranged in the overflow pipe 52, and the expansion component 8 is used to drive the T-shaped arm 6 to move;

[0018] Further preferably, the center of the overflow pipe 52 also has an axially extending cylindrical sealing cavity 53;

[0019] Further preferably, the expansion component 8 has a piston 81, a spring 82 and paraffin 83. The piston 81 is axially slidably connected in the cylindrical sealing cavity 53. The top end surface of the piston 81 is fixedly connected to the vertical limb 61 of the T-shaped arm 6. Paraffin 83 is arranged in the cylindrical sealing cavity 53 at the bottom end surface of the piston 81. The spring 82 forces the piston 81 to move downward;

[0020] Through the above settings, in the actual working process, its specific working principle is as follows:

[0021] When the transformer 1 is working, the motor 2 is started. The motor 2 drives the impeller pump 3 to suck the hot oil at the top of the transformer 1, and then pumps it into the heat dissipation fin tube 11 through the connecting pipe 9 for heat dissipation. During the whole pumping process, the oil of the transformer 1 can continuously circulate, so as to quickly conduct the heat inside the transformer 1 out for heat dissipation;

[0022] When the oil temperature of the transformer 1 is relatively low: The paraffin wax 83 in the expansion assembly 8 has not reached the melting point and is in a solid state. Due to volume expansion, the solid paraffin wax 83 will squeeze the piston 81 to drive the T-shaped arm 6 to move upward, so that the valve plate 7 on one side of the T-shaped arm 6 blocks the connecting pipe 9 communicating with the heat dissipation fin tube 11. The impeller pump 3 pumps the inhaled hot oil out from the overflow pipe 52, so as to enable the oil inside the transformer 1 to circulate rapidly to achieve the effect of equalizing the oil temperature;

[0023] When the oil temperature of the transformer 1 is relatively high: The paraffin wax 83 in the expansion assembly 8 melts and is in a liquid state. Due to volume shrinkage, the piston 81 and the T-shaped arm 6 are driven by the spring 82 to move downward, so that the valve plate 7 at the bottom of the T-shaped arm 6 blocks the overflow pipe 52, thereby pumping all the hot oil inhaled by the impeller pump 3 to the heat dissipation fin tube 11 for cooling and heat dissipation;

[0024] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A variable oil pressure oil immersed transformer, characterized in that: It includes a transformer, a motor, an impeller pump, a variable oil pressure component and a connecting pipe. The transformer is surrounded by heat dissipation fins. The top surface of the transformer is provided with an impeller pump. The oil suction port of the impeller pump is immersed in the transformer oil. The oil outlet of the impeller pump is connected with the oil port at the top of the heat dissipation fin tube through the connecting pipe. The oil port at the bottom of the heat dissipation fin tube is connected with the internal cavity of the transformer. The variable oil pressure component is arranged in the middle of the connecting pipe. The variable oil pressure component is used to control the oil entering the heat dissipation fin tube.

2. A variable oil pressure oil immersed transformer according to claim 1, characterized in that: The variable oil pressure assembly includes a T-shaped shell, a T-shaped arm, a valve plate and an expansion assembly. The T-shaped shell has a connecting cavity, one side of the connecting cavity is connected to a connecting pipe connected to the oil outlet of an impeller pump, and the other side of the connecting cavity is connected to a connecting pipe connected to a heat dissipation fin tube. The bottom of the T-shaped shell has an overflow pipe, and the overflow pipe is connected to the connecting cavity. The T-shaped arm has a vertical limb and a horizontal limb, and the vertical limb slides axially along the overflow pipe. The bottom of the horizontal limb is provided with a valve plate for blocking the overflow pipe, and one side of the horizontal limb is provided with a valve plate for blocking the connecting pipe connected to the heat dissipation fin tube. The overflow pipe is provided with an expansion assembly, and the expansion assembly is used to drive the T-shaped arm to move.

3. A variable oil pressure oil immersed transformer according to claim 2, characterized in that: The overflow pipe also has an axially extending cylindrical sealing cavity at its center.

4. A variable oil pressure oil immersed transformer according to claim 2, characterized in that: The expansion assembly comprises a piston, a spring and paraffin. The piston is axially slidably connected in a cylindrical sealing cavity. The top end surface of the piston is fixedly connected to the vertical limb of the T-shaped arm. Paraffin is arranged in the cylindrical sealing cavity of the bottom end surface of the piston. The spring forces the piston to move toward the bottom.

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