Internal oil type metal corrugated oil conservator with positive pressure detection limiting device

Abstract

The utility model relates to an internal oil type metal corrugated oil conservator, in particular to an internal oil type metal corrugated oil conservator with a positive pressure detection limiting device, which comprises an internal oil type metal corrugated oil conservator and a limiting device arranged in the internal oil type metal corrugated oil conservator, and the internal oil type metal corrugated oil conservator comprises a base, a conservator cover and a corrugated core body, the limiting device is installed on the two sides of the corrugated core body and comprises an upper limiting sleeve, a pressing block, a rotating shaft, a supporting sleeve, a lower limiting sleeve, a handle and a check ring, the upper limiting sleeve and the lower limiting sleeve are welded to the upper end and the lower end of the rotating shaft respectively and rotate along with the rotating shaft, the pressing block and the upper limiting sleeve are fixed together, and the supporting sleeve is located on the lower portion of the check ring in the middle of the rotating shaft and used for supporting the rotating shaft. The handle is located at the lowermost end of the rotating shaft. By rotating the handle of the limiting device, the pressing block limits expansion of the corrugated core body, positive pressure sealing detection can be carried out, the handle is rotated again after detection to enable the pressing block to be separated, normal movement of the corrugated core body is not affected, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to an internal oil type metal corrugated oil storage cabinet, in particular to an internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device. Background Art

[0002] The metal corrugated oil conservator is one of the important components of the oil-immersed transformer, which is used to compensate for the volume change caused by the temperature change of the transformer oil. In order to ensure the overall sealing of the transformer system, it is required that after the transformer is installed, 30 or 50KPa oil pressure or air pressure is applied to the oil conservator, and the pressure is maintained for 24 hours to ensure that the transformer system is leak-free. This operation is very necessary. At present, more and more transformer manufacturers, power supply bureaus and national grid systems have included this item in the project acceptance standards. However, due to its structural reasons, the traditional internal oil type metal corrugated oil conservator cannot meet the requirements of positive pressure sealing detection. Therefore, in order to meet the requirements, the internal oil type metal corrugated oil conservator on the market generally sets a gantry beam frame around the corrugated core inside the oil conservator. When the oil pressure is applied to the corrugated core of the oil conservator, the gantry beam frame can limit the expansion of the corrugated core, thereby avoiding the damage of the corrugated core due to excessive expansion, thereby meeting the requirements of positive pressure detection. However, the gantry beam frame mainly has the following two forms:

[0003] 1. The height of the gantry beam is consistent with the highest point of the corrugated core expansion. This type of gantry beam does not affect the normal expansion and movement of the corrugated core; however, the beam itself is high and the manufacturing process is complex, which greatly increases the cost of the oil storage cabinet.

[0004] 2. The height of the gantry beam is consistent with the lowest point of the corrugated core expansion operation. This type of gantry beam has a low height, simple manufacturing and processing, and low cost; but the gantry beam limits the normal operation of the corrugated core. Therefore, after the transformer completes the positive pressure seal test, the gantry beam in the oil storage cabinet needs to be removed before it can be used normally, which is complicated to operate. Utility Model Content

[0005] In view of the above problems existing in the existing internal oil type metal corrugated oil conservator, the purpose of the utility model is to provide an internal oil type metal corrugated oil conservator with a positive pressure detection limit device.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] The utility model comprises a base, a cabinet cover and a corrugated core, the cabinet cover is installed on the base, the corrugated core is located in the cabinet cover, and the bottom of the corrugated core is fixed on the base; an oil pipeline and an exhaust pipe are respectively installed on the base, the upper ends of the oil pipeline and the exhaust pipe are respectively connected with the inside of the corrugated core, and the lower ends of the oil pipeline and the exhaust pipe are both located outside the base; a limiting device is provided between the corrugated core and the cabinet cover, and the limiting device comprises a pressing block, a rotating shaft, a supporting sleeve and a retaining ring, the supporting sleeve is fixed on the inner wall of the cabinet cover, a retaining ring is provided on the rotating shaft, the rotating shaft can be relatively rotatably passed through the supporting sleeve, and the rotating shaft is supported and limited by the contact between the supporting sleeve and the retaining ring, the pressing block is installed on the upper end of the rotating shaft and rotates with the rotating shaft, and the lower end of the rotating shaft is located outside the base; when the oil storage cabinet performs positive pressure sealing detection, the pressing block rotates to the top of the corrugated core with the rotating shaft, and presses on the top of the corrugated core to limit the upward expansion of the corrugated core.

[0008] Wherein: an upper limit sleeve is fixedly connected to the upper end of the rotating shaft, the pressing block is installed on the upper limit sleeve, and the upper limit sleeve and the pressing block both rotate together with the rotating shaft.

[0009] A lower limit sleeve is fixedly connected to the lower end of the rotating shaft. The lower limit sleeve is located outside the base and rotates together with the rotating shaft.

[0010] The installation height of the lower limit sleeve is flush with the bottom surface of the base, that is, the lower limit sleeve abuts against the bottom surface of the base.

[0011] A handle for facilitating the rotation of the shaft is installed at the lower end of the shaft.

[0012] The installation height of the pressing block is flush with the top surface of the corrugated core when it is in a free state.

[0013] One side of the support sleeve is a mounting plate fixedly connected to the inner wall of the cabinet cover, and the other side of the support sleeve is a hollow cylinder, and the inner diameter of the other side of the support sleeve is smaller than the outer diameter of the retaining ring.

[0014] There are one or more corrugated cores, and at least two pairs of limiting devices are symmetrically installed on both sides of each corrugated core.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. The utility model limits the expansion of the corrugated core by means of a pressing block, and compared with the traditional gantry beam structure, the utility model has a simple structure and saves materials.

[0017] 2. The utility model rotates the handle of the limit device so that the pressure block limits the expansion of the corrugated core, and the oil storage cabinet can be tested for positive pressure sealing. After the test, the handle is rotated again to disengage the pressure block without affecting the normal movement of the corrugated core. All steps are simple, and there is no need to disassemble the internal parts of the oil storage cabinet. The operation is convenient and time-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the limit device of the utility model;

[0020] Figure 3 This is a structural schematic diagram of the limiting device of the utility model in a limiting state;

[0021] Figure 4 It is a structural schematic diagram of the limit device of the utility model in a limit release state;

[0022] Among them: 1 is a base, 2 is a cabinet cover, 3 is a corrugated core, 4 is a limit device, 401 is an upper limit sleeve, 402 is a pressure block, 403 is a rotating shaft, 404 is a support sleeve, 405 is a lower limit sleeve, 406 is a handle, 407 is a retaining ring, 5 is an oil pipeline, and 6 is an exhaust pipe. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, the utility model includes an internal oil type metal corrugated oil storage cabinet and a limit device 4 installed inside the internal oil type metal corrugated oil storage cabinet. The internal oil type metal corrugated oil storage cabinet includes a base 1, a cabinet cover 2 and a corrugated core 3. The cabinet cover 2 is installed on the base 1, the corrugated core 3 is located in the cabinet cover 2, and the bottom of the corrugated core 3 is fixed on the base 1; an oil pipeline 5 and an exhaust pipe 6 are respectively installed on the base 1, and the upper ends of the oil pipeline 5 and the exhaust pipe 6 are respectively connected to the inside of the corrugated core 3, and the lower ends of the oil pipeline 5 and the exhaust pipe 6 are both located outside the base 1.

[0025] In this embodiment, a limiting device 4 is provided between the corrugated core 3 and the cabinet cover 2. Figure 2 As shown, the limiting device 4 includes a pressure block 402, a rotating shaft 403, a support sleeve 404 and a retaining ring 407. The support sleeve 404 is fixed on the inner wall of the cabinet cover 2, and a retaining ring 407 is provided on the rotating shaft 403. The rotating shaft 403 can pass through the support sleeve 404 in a relatively rotatable manner, and the rotating shaft 403 is supported and limited by the contact between the support sleeve 404 and the retaining ring 407. The pressure block 402 is installed on the upper end of the rotating shaft 403 and rotates with the rotating shaft 403. The lower end of the rotating shaft 403 is located outside the base 1.

[0026] In this embodiment, an upper limit sleeve 401 is welded to the upper end of the rotating shaft 403, and a pressing block 402 is fixed to the upper limit sleeve 401. The upper limit sleeve 401 and the pressing block 402 rotate together with the rotating shaft 403. A lower limit sleeve 405 is welded to the lower end of the rotating shaft 403. The lower limit sleeve 405 is located outside the base 1 and rotates together with the rotating shaft 403. A handle 406 is installed at the lower end of the rotating shaft 403 to facilitate the rotation of the rotating shaft 403. The handle 406 is located below the lower limit sleeve 405.

[0027] One side of the support sleeve 404 of this embodiment is a mounting plate fixedly connected to the inner wall of the cabinet cover 2, and the other side of the support sleeve 404 is a hollow cylinder, through which the rotating shaft 403 passes. The retaining ring 407 of this embodiment is located between the upper limit sleeve 401 and the lower limit sleeve 405, and is located above the support sleeve 404. The inner diameter of the hollow cylinder on the other side of the support sleeve 404 is smaller than the outer diameter of the retaining ring 407.

[0028] In this embodiment, the installation height of the upper limit sleeve 401 and the pressing block 402 is flush with the top surface of the corrugated core 3 when it is in a free state.

[0029] In this embodiment, the installation height of the lower limit sleeve 405 is flush with the bottom surface of the base 1 , that is, the lower limit sleeve 405 abuts against the bottom surface of the base 1 .

[0030] The corrugated core 3 of this embodiment may be one or more, and at least two pairs of limiting devices 4 are symmetrically installed on both sides of each corrugated core 3 .

[0031] The working principle of the utility model is:

[0032] When the oil storage cabinet is to be tested for positive pressure sealing, the handle 406 at the lower end of the rotating shaft 403 in the limit device 4 is turned to rotate the rotating shaft 403, thereby driving the upper limit sleeve 401, the pressure block 402, the retaining ring 407 and the lower limit sleeve 405 to rotate together, and the pressure block 402 rotates to press on the top of the corrugated core 3 to limit the upward expansion of the corrugated core 3, so as to meet the positive pressure sealing test requirements. Figure 3 After the test is completed, the handle 406 at the lower end of the rotating shaft 403 in the limit device 4 is rotated again, and the rotation angle is 90°, so that the pressing block 402 is separated from the top of the corrugated core 3. At this time, the corrugated core 3 can expand and contract normally, and the oil storage cabinet can operate normally. Figure 4 shown.

Claims

1. An internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device, comprising a base (1), a cabinet cover (2) and a corrugated core (3), wherein the cabinet cover (2) is mounted on the base (1), the corrugated core (3) is located inside the cabinet cover (2), and the bottom of the corrugated core (3) is fixed on the base (1); an oil delivery pipe (5) and an exhaust pipe (6) are respectively mounted on the base (1), the upper ends of the oil delivery pipe (5) and the exhaust pipe (6) are respectively connected to the inside of the corrugated core (3), and the lower ends of the oil delivery pipe (5) and the exhaust pipe (6) are both located outside the base (1); characterized in that: A limiting device (4) is provided between the corrugated core (3) and the cabinet cover (2), the limiting device (4) comprising a pressing block (402), a rotating shaft (403), a supporting sleeve (404) and a retaining ring (407), the supporting sleeve (404) being fixed on the inner wall of the cabinet cover (2), the rotating shaft (403) being provided with a retaining ring (407), the rotating shaft (403) being able to pass through the supporting sleeve (404) in a relatively rotatable manner, and being able to rotate relative to the supporting sleeve (404) and the retaining ring The contact of the rotating shaft (407) supports and limits the rotating shaft (403), the pressing block (402) is installed on the upper end of the rotating shaft (403) and rotates with the rotating shaft (403), and the lower end of the rotating shaft (403) is located outside the base (1); when the oil storage cabinet is subjected to positive pressure sealing detection, the pressing block (402) rotates to the top of the corrugated core (3) with the rotating shaft (403) and presses on the top of the corrugated core (3) to limit the upward expansion of the corrugated core (3).

2. According to claim 1, the internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device is characterized in that: An upper limit sleeve (401) is fixedly connected to the upper end of the rotating shaft (403), and the pressing block (402) is installed on the upper limit sleeve (401). Both the upper limit sleeve (401) and the pressing block (402) rotate together with the rotating shaft (403).

3. The internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device according to claim 1 is characterized in that: A lower limit sleeve (405) is fixedly connected to the lower end of the rotating shaft (403); the lower limit sleeve (405) is located outside the base (1) and rotates together with the rotating shaft (403).

4. The internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device according to claim 3 is characterized in that: The installation height of the lower limit sleeve (405) is flush with the bottom surface of the base (1), that is, the lower limit sleeve (405) abuts against the bottom surface of the base (1).

5. The internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device according to claim 1 is characterized in that: A handle (406) is installed at the lower end of the rotating shaft (403) for facilitating the rotation of the rotating shaft (403).

6. The internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device according to claim 1 is characterized in that: The installation height of the pressing block (402) is flush with the top surface of the corrugated core (3) when it is in a free state.

7. The internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device according to claim 1 is characterized in that: One side of the support sleeve (404) is a mounting plate fixedly connected to the inner wall of the cabinet cover (2), and the other side of the support sleeve (404) is a hollow cylinder, and the inner diameter of the other side of the support sleeve (404) is smaller than the outer diameter of the retaining ring (407).

8. The internal oil type metal corrugated oil storage cabinet with a positive pressure detection limit device according to claim 1 is characterized in that: There are one or more corrugated cores (3), and at least two pairs of limiting devices (4) are symmetrically installed on both sides of each corrugated core (3).

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