External oil horizontal type metal corrugated oil conservator with flow speed buffering device

Abstract

The utility model relates to a metal corrugated oil conservator for an oil-immersed transformer, in particular to an external oil horizontal type metal corrugated oil conservator with a flow speed buffer device, which comprises an oil conservator shell and a corrugated core body arranged in the oil conservator shell, the flow speed buffer device is arranged on the oil conservator shell, and an oil inlet and an air vent are arranged on two sides of the shell. The oil inlet is connected with the oil conservator shell, the air vent is communicated with the outside atmosphere through the filter screen, the piston disc is located in the shell, the shape of the piston disc is consistent with the section of the shell, the sealing ring is installed on the contact face, one end of the spring is connected with the piston disc, and the other end of the spring is fixed to the inner wall of the shell. The external oil horizontal type metal corrugated oil conservator is simple in structure, can buffer instant impact oil flow formed by operation clamping stagnation of the corrugated core body of the oil conservator on the premise that the sealing performance of the external oil horizontal type metal corrugated oil conservator is guaranteed, and avoids shutdown of the transformer caused by false alarm of a gas relay of the transformer.

Description

Technical Field

[0001] The utility model relates to a metal corrugated oil storage cabinet for an oil-immersed transformer, in particular to an external oil horizontal metal corrugated oil storage cabinet with a flow rate buffer device. Background Art

[0002] The external oil horizontal metal corrugated oil conservator is a component used in conjunction with oil-immersed transformers. The corrugated core inside it expands and contracts to compensate for the volume change caused by the temperature change of the transformer oil, and ensures that the transformer oil is always isolated from the atmosphere to prevent oxidation. The outer shell of the external oil horizontal metal corrugated oil conservator is a horizontal cylinder, and the corrugated core inside it is also a cylinder, and the pulleys arranged around it ensure sliding, stretching and shrinking inside the outer shell of the oil conservator. In the actual processing and use process, the outer shell of the oil conservator is deformed due to processing errors or bumps, or the pulleys arranged around the corrugated core are worn due to long-term operation. The above situations will cause the corrugated core to become stuck during operation. If the corrugated core is stuck, its expansion and contraction will not be stable and slow, but will show irregular sudden movements. This movement will form an instantaneous impact force, causing the pressure inside the oil conservator to suddenly increase, quickly squeezing or sucking the transformer oil, and instantly increasing the oil flow rate in the pipeline. This phenomenon will cause the gas relay that monitors the oil flow rate of the transformer to trip, causing the transformer to stop operating and affecting the overall operation of the transformer. Utility Model Content

[0003] The utility model aims to provide a horizontal metal corrugated oil storage cabinet for external oil with a flow rate buffer device, so as to overcome the above-mentioned defects of the traditional horizontal metal corrugated oil storage cabinet for external oil.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] The utility model comprises an oil storage tank shell and a corrugated core body installed in the oil storage tank shell, wherein the expansion and contraction direction of the corrugated core body is a horizontal direction; a flow rate buffer device is installed on the oil storage tank shell, wherein the flow rate buffer device comprises a filter screen, an outer shell, a spring and a piston disc, and an oil inlet and an air vent are respectively provided on two sides of the outer shell, wherein the oil inlet is connected to the oil storage tank shell and communicates with the interior of the oil storage tank shell, wherein the air vent is connected to the outside atmosphere, and a filter screen is provided at the air vent; the spring and the piston disc are both located in the outer shell and between the oil inlet and the air vent, wherein the piston disc can be relatively movably sealed and abutted against the inner wall of the outer shell, wherein one end of the spring is connected to the piston disc, and the other end of the spring is connected to the inner wall of the outer shell.

[0006] Wherein: the expansion and contraction direction of the spring and the moving direction of the piston disc are the same as the expansion and contraction direction of the corrugated core.

[0007] The elastic force of the spring is greater than the working pressure of the external oil horizontal metal corrugated oil storage cabinet during normal operation.

[0008] The cross sections of the shell and the piston disc in the vertical direction are both circular.

[0009] At least one annular sealing groove is formed on the side of the piston disc, and a sealing ring is accommodated in each of the annular sealing grooves. The piston disc is sealed with the inner wall of the housing through the sealing ring.

[0010] The advantages and positive effects of the utility model are:

[0011] 1. The utility model has a simple structure, and the flow rate buffer device can buffer the instantaneous impact oil flow caused by the stagnation of the corrugated core of the oil storage cabinet, thereby avoiding the transformer being shut down due to a false alarm of the gas relay of the transformer.

[0012] 2. The utility model will not destroy the overall sealing of the external oil horizontal metal corrugated oil storage cabinet, will not cause the transformer oil to leak out during buffering, can reset itself after buffering, can be reused without additional power, and will not affect the normal operation of the oil storage cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 for Figure 1 A schematic diagram of the structure of a medium flow rate buffer device;

[0015] Among them: 1 is a flow rate buffer device, 101 is a vent, 102 is a filter screen, 103 is a device housing, 104 is a spring, 105 is a piston disc, 106 is a sealing ring, 107 is an oil inlet, 2 is an oil storage cabinet shell, and 3 is a corrugated core. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 1 As shown, the utility model includes an oil conservator shell 2 and a corrugated core 3 installed in the oil conservator shell 2. The oil conservator shell 2 and the corrugated core 3 are both horizontally placed cylinders, that is, the axial directions of the oil conservator shell 2 and the corrugated core 3 are both horizontal, and the axial center lines are collinear, and the expansion and contraction direction of the corrugated core 3 is horizontal.

[0018] like Figure 1 , Figure 2As shown, a flow rate buffer device 1 is installed on the oil conservator housing 2 of this embodiment, and the flow rate buffer device 1 is installed at the bottom of one side of the oil conservator housing 2. The flow rate buffer device 1 of this embodiment includes a filter 102, a shell 103, a spring 104 and a piston disc 105. The two sides of the shell 103 are respectively provided with an oil inlet 107 and an air vent 101. The oil inlet 107 is connected to the oil conservator housing 2 and communicates with the interior of the oil conservator housing 2. The air vent 101 is connected to the outside atmosphere, and a filter 102 is provided at the air vent 101. The spring 104 and the piston disc 105 are both located in the shell 103 and between the oil inlet 107 and the air vent 101. The piston disc 105 can be relatively movably sealed against the inner wall of the shell 103. One end of the spring 104 is connected to the piston disc 105, and the other end of the spring 104 is connected to the inner wall of the shell 103.

[0019] At least one (two in this embodiment) annular sealing groove is provided on the side of the piston disc 105 (i.e., the contact surface with the inner wall of the housing 103), each of which accommodates a sealing ring 106. The piston disc 105 is sealed with the inner wall of the housing 103 via the sealing ring 106.

[0020] In this embodiment, the vertical cross-section of the housing 103 is circular, and accordingly, the vertical cross-section of the piston disc 105 is also circular; the expansion and contraction direction of the spring 104 and the moving direction of the piston disc 105 are the same as the expansion and contraction direction of the corrugated core 3, both of which are horizontal directions.

[0021] The elastic force of the spring 104 in this embodiment is greater than the working pressure of the external oil horizontal metal corrugated oil storage cabinet during normal operation. The working condition during normal operation means that the expansion and contraction of the corrugated core 3 does not appear stuck and runs smoothly.

[0022] The working principle of the utility model is:

[0023] When the external oil horizontal metal corrugated oil conservator is operating normally, since the elastic force of the spring 104 in the flow velocity buffer device 1 is greater than the working pressure inside the oil conservator, the piston disc 105 is pushed to the far right by the spring 104, and there is no transformer oil in the flow velocity buffer device 1 at this time.

[0024] When the corrugated core 3 of the external oil horizontal metal corrugated oil storage cabinet is in operation, the pulley is stuck and suddenly moves, which will cause the pressure inside the oil storage cabinet to suddenly increase. At this time, the transformer oil will push the piston plate 105 to move to the left to compress the spring 104, and enter the housing 103 of the flow rate buffer device 1 through the oil inlet 107, thereby releasing the pressure, preventing the transformer oil from being squeezed into the pipeline, and playing a buffering role on the flow rate.

[0025] When the external oil horizontal metal corrugated oil storage tank resumes normal operation, the internal pressure drops, the spring 104 pushes the piston disc 105 to return to its original state, and the entire flow rate buffer device 1 returns to its original state.

Claims

1. An external oil horizontal metal corrugated oil conservator with a flow rate buffer device, comprising an oil conservator shell (2) and a corrugated core (3) installed in the oil conservator shell (2), wherein the expansion and contraction direction of the corrugated core (3) is a horizontal direction; characterized in that: A flow rate buffer device (1) is installed on the oil storage cabinet shell (2), and the flow rate buffer device (1) comprises a filter screen (102), a shell (103), a spring (104) and a piston plate (105). An oil inlet (107) and a vent (101) are respectively provided on two sides of the shell (103). The oil inlet (107) is connected to the oil storage cabinet shell (2) and communicates with the interior of the oil storage cabinet shell (2). The vent (101) is connected to the outside atmosphere. , and a filter screen (102) is provided at the vent (101); the spring (104) and the piston disc (105) are both located in the housing (103) and between the oil inlet (107) and the vent (101); the piston disc (105) is relatively movable and sealed against the inner wall of the housing (103); one end of the spring (104) is connected to the piston disc (105), and the other end of the spring (104) is connected to the inner wall of the housing (103).

2. The external oil horizontal metal corrugated oil storage cabinet with flow rate buffer device according to claim 1 is characterized in that: The expansion and contraction direction of the spring (104) and the moving direction of the piston disc (105) are the same as the expansion and contraction direction of the corrugated core (3).

3. The external oil horizontal metal corrugated oil storage cabinet with flow rate buffer device according to claim 1 is characterized in that: The elastic force of the spring (104) is greater than the working pressure of the external oil horizontal metal corrugated oil storage cabinet during normal operation.

4. The external oil horizontal metal corrugated oil storage cabinet with flow rate buffer device according to claim 1 is characterized in that: The cross-sections of the housing (103) and the piston disc (105) in the vertical direction are both circular.

5. The external oil horizontal metal corrugated oil storage cabinet with flow rate buffer device according to claim 1 is characterized in that: At least one annular sealing groove is provided on the side of the piston disc (105), and a sealing ring (106) is accommodated in each of the annular sealing grooves. The piston disc (105) is sealed with the inner wall of the housing (103) via the sealing ring (106).

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