Integrated temperature and pressure measuring device of oil-immersed transformer

Abstract

The utility model discloses an integrated temperature and pressure measuring device of an oil-immersed transformer, which comprises a transformer box body, an outer sleeve is inserted into the top of the transformer box body, an inner measuring tube is coaxially arranged in the outer sleeve in a sliding manner, and an outer thread is arranged on the outer side of the top of the inner measuring tube; an adjusting sleeve is coaxially and rotatably arranged at the top of the outer sleeve, and the adjusting sleeve is correspondingly connected with the external thread in a threaded fit manner; the interior of the inner measuring pipe is divided into a first cavity and a second cavity through an axial partition plate, a temperature sensor and a pressure sensor are arranged in the first cavity and the second cavity respectively, and the bottom end of the first cavity and the bottom end of the second cavity are both communicated with the internal environment of the transformer box. According to the utility model, the depth position of the measuring structure extending into the transformer box body can be adjusted, so that the pressure and temperature at different depth positions in the transformer box body can be detected, and the temperature distribution condition in the transformer box body can be reflected more comprehensively and accurately.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer monitoring and relates to an integrated temperature and pressure measuring device for an oil-immersed transformer. Background Art

[0002] An oil-immersed transformer refers to a type of transformer filled with transformer oil inside the transformer box. During the operation of the oil-immersed transformer, it is necessary to monitor the temperature of the transformer oil inside the transformer box, and then determine whether the oil-immersed transformer is in a safe and stable operating state by monitoring the temperature. In the prior art, a measuring tube extending to the inside of the transformer box is usually installed on the top of the transformer box, and an optical fiber temperature probe is inserted inside the measuring tube, and the oil temperature inside the transformer box is detected by the optical fiber temperature probe. However, the problem with the above structure is that once the optical fiber temperature probe is fixed in the measuring tube, its depth position inside the transformer box is also fixed, resulting in the optical fiber temperature probe can only detect the temperature at a fixed depth position inside the transformer box. However, during the actual operation of the oil-immersed transformer, due to the different heating degrees of different components inside the transformer box, different locations of external ambient temperature influence, and different locations of transformer oil circulation and heat dissipation, the internal temperature of the oil-immersed transformer presents different distributions with different depth positions. The measurement results finally obtained by the fixed installation structure of the existing transformer optical fiber temperature probe cannot accurately and comprehensively represent the actual temperature distribution inside the transformer box, which has an adverse effect on the subsequent judgment of whether the transformer is in a safe operating state.

[0003] Therefore, in view of the above technical problems existing in the temperature detection structure with a fixed position in the existing oil-immersed transformer, the utility model discloses an integrated temperature and pressure measuring device for the oil-immersed transformer. Utility Model Content

[0004] The purpose of the utility model is to provide an integrated temperature and pressure measuring device for an oil-immersed transformer, which can adjust the depth position of the measuring structure to the inside of the transformer box, and then detect the pressure and temperature at different depths inside the transformer box, so as to more comprehensively and accurately reflect the temperature distribution inside the transformer box.

[0005] The utility model is realized by the following technical solutions:

[0006] An integrated temperature and pressure measuring device for an oil-immersed transformer comprises a transformer case, an outer sleeve is inserted on the top of the transformer case, an inner measuring tube is coaxially slidably arranged inside the outer sleeve, and an outer thread is arranged on the outer side of the top of the inner measuring tube; an adjusting sleeve is coaxially rotatably arranged on the top of the outer sleeve, and the adjusting sleeve is threadably connected with the corresponding outer thread; the interior of the inner measuring tube is divided into a first cavity and a second cavity by an axial partition, a temperature sensor and a pressure sensor are respectively arranged inside the first cavity and the second cavity, and the bottom ends of the first cavity and the second cavity are both connected to the internal environment of the transformer case.

[0007] The adjusting sleeve is rotated, and the threaded matching structure between the adjusting sleeve and the inner measuring tube is used to drive the inner measuring tube to move along the axis of the outer sleeve, so as to adjust the depth of the temperature sensor and the pressure sensor in the inner measuring tube into the transformer box, thereby realizing the detection of the temperature and oil pressure at different depths in the transformer box. The depth position of the current pressure sensor inside the transformer box can be calculated through the detected pressure data and oil density, and the temperature at the current depth position can be detected through the temperature sensor, thereby accurately obtaining the temperature distribution at different depths in the transformer box, so as to accurately determine whether the transformer is in normal working condition.

[0008] In order to better realize the utility model, further, a driving device is provided on one side of the top end of the outer sleeve, and the driving end of the driving device is connected to the adjusting sleeve and drives the adjusting sleeve to rotate.

[0009] In order to better realize the utility model, further, the driving device includes an electric driving part, the electric driving part includes a driving ring gear, a driving gear, and a driving motor, the driving ring gear is mounted on the top outer side of the adjusting sleeve, the driving motor is arranged on one side of the top end of the outer sleeve, and the output shaft of the driving motor is mounted with a driving gear, and the driving gear is meshingly connected with the driving ring gear.

[0010] In order to better implement the utility model, further, the driving device also includes a manual driving part, and the manual driving part includes a rotating handle arranged on the top of the adjustment sleeve.

[0011] In order to better realize the utility model, further, at least one group of axial guide bars are arranged on the inner wall of the outer sleeve, and an axial guide groove which is slidably connected with the axial guide bars is arranged on the outer wall of the inner tube.

[0012] In order to better realize the utility model, further, a protective sleeve is sleeved on the outside of the bottom end of the inner measuring tube, and a slow flow cavity is arranged inside the protective sleeve, and the slow flow cavity is connected with the bottom ends of the first cavity and the second cavity.

[0013] In order to better realize the utility model, further, a filter screen is arranged on the bottom end and the side wall of the protective cover.

[0014] In order to better realize the utility model, further, an axial sliding sealing ring is arranged between the outer wall of the inner measuring tube and the inner wall of the outer sleeve.

[0015] In order to better realize the utility model, further, a cover is provided at the top end of the inner measuring tube, and a cable hole is provided on the cover.

[0016] In order to better implement the present invention, further, the interior of the first cavity and the second cavity is filled with insulating resin.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The utility model differentially installs an outer sleeve on the transformer box body, and installs an inner measuring tube axially slidingly inside the outer sleeve. By rotating the adjusting sleeve on the top of the outer sleeve, the inner measuring tube can be driven to slide axially through the threaded matching connection structure between the adjusting sleeve and the inner measuring tube, thereby adjusting the depth of the temperature sensor and the pressure sensor in the inner measuring tube extending into the transformer box body, thereby measuring the pressure and temperature at different depths inside the transformer box body, and can more comprehensively and accurately reflect the pressure and temperature distribution conditions at different depths inside the transformer box body, thereby providing a guarantee for the safe and stable operation of the oil-immersed transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of an integrated temperature and pressure measuring device;

[0020] Figure 2 It is a schematic diagram of the external structure of the integrated temperature and pressure measuring device;

[0021] Figure 3 It is a schematic diagram of the explosion assembly of the integrated temperature and pressure measuring device;

[0022] Figure 4 This is a schematic diagram of the structure of the inner measuring tube.

[0023] Among them: 1-transformer box; 2-outer sleeve; 3-inner measuring tube; 4-adjusting sleeve; 5-axial partition; 6-temperature sensor; 7-pressure sensor; 8-driving device; 9-protective sleeve; 21-axial guide bar; 31-axial guide groove; 32-cover; 81-driving gear ring; 82-driving gear; 83-driving motor; 91-slow flow chamber; 92-filter; 100-first chamber; 200-second chamber. DETAILED DESCRIPTION

[0024] The following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the utility model explicitly states otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and so on in the present utility model should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0028] Embodiment 1:

[0029] An integrated temperature and pressure measuring device for an oil-immersed transformer according to this embodiment is as follows: Figure 1-Figure 3 As shown, it includes a transformer box 1, an outer sleeve 2 is inserted on the top of the transformer box 1, an inner tube 3 is coaxially slidably arranged inside the outer sleeve 2, and an external thread is arranged on the top outer side of the inner tube 3; an adjustment sleeve 4 is coaxially rotatably arranged on the top of the outer sleeve 2, and the adjustment sleeve 4 is threadedly connected with the corresponding external thread; the interior of the inner tube 3 is divided into a first cavity 100 and a second cavity 200 by an axial partition plate 5, and a temperature sensor 6 and a pressure sensor 7 are respectively arranged inside the first cavity 100 and the second cavity 200, and the bottom ends of the first cavity 100 and the second cavity 200 are both connected to the internal environment of the transformer box 1.

[0030] The top of the transformer box 1 is provided with a mounting hole, and an outer sleeve 2 is inserted into the mounting hole. A connecting flange is provided on the outer side of the top of the outer sleeve 2. The connecting flange contacts the top of the transformer box 1 and is connected by connecting screws to realize the installation and fixation of the outer sleeve 2 on the top of the transformer box 1. An inner measuring tube 3 is axially slidably provided inside the outer sleeve 2. The top of the inner measuring tube 3 extends upward to the top of the transformer box 1, and the bottom of the inner measuring tube 3 extends downward to the inside of the transformer box 1. An axial partition 5 is provided inside the inner measuring tube 3. The axial partition 5 divides the inside of the inner measuring tube 3 into a first cavity 100 and a second cavity 200 that are independent of each other. A temperature sensor 6 and a pressure sensor 7 are respectively installed at the same height position in the first cavity 100 and the second cavity 200. The pressure sensor 7 detects the pressure at the current depth position inside the transformer box 1, and sends the pressure data to the external controller through an external cable. The external controller can calculate the depth position of the pressure sensor 7 and the temperature sensor 6 inside the transformer box 1 according to the received pressure data and the density of the oil. The temperature sensor 6 detects the temperature at the current depth inside the transformer box 1 .

[0031] When it is necessary to detect the temperature at different depths inside the transformer box 1, for example, it is necessary to detect the temperature near the bottom of the inner side of the transformer box 1. The adjusting sleeve 4 can be rotated, and the inner hole of the adjusting sleeve 4 is connected with the corresponding outer thread on the outer side of the top of the inner measuring tube 3 through the inner thread. When the adjusting sleeve 4 is rotated, the inner measuring tube 3 can be driven to move along the axial direction of the outer sleeve 1, thereby adjusting the depth of one end of the inner measuring tube 3 extending to the inside of the transformer box 1.

[0032] Embodiment 2:

[0033] An integrated temperature and pressure measuring device for an oil-immersed transformer is improved on the basis of Example 1, such as Figure 1-Figure 3 As shown, a driving device 8 is provided on one side of the top end of the outer sleeve 2, and a driving end of the driving device 8 is connected to the adjusting sleeve 4 and drives the adjusting sleeve 4 to rotate.

[0034] Further, such as Figure 2 and Figure 3 As shown, the driving device 8 includes an electric driving part, which includes a driving ring gear 81, a driving gear 82, and a driving motor 83. The driving ring gear 81 is sleeved on the top outer side of the adjustment sleeve 4, and the driving motor 83 is arranged on one side of the top of the outer sleeve 2. The driving gear 82 is sleeved on the output shaft of the driving motor 83, and the driving gear 82 is meshed and connected with the driving ring gear 81.

[0035] The driving motor 83 is installed on the top of the transformer box 1 through the motor mounting bracket. The driving motor 83 drives the driving gear 82 to rotate, and then drives the adjustment sleeve 4 to rotate through the meshing structure between the driving gear 82 and the driving gear ring 81, and finally realizes the adjustment of the measuring depth of the inner measuring tube 3.

[0036] Furthermore, the driving device 8 also includes a manual driving part, and the manual driving part includes a rotating handle arranged on the top of the adjusting sleeve 4. The adjusting sleeve 4 can also be driven to rotate by manually rotating the rotating handle. The rotating handle is usually used when the staff regularly inspects the oil-immersed transformer.

[0037] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0038] Embodiment 3:

[0039] An integrated temperature and pressure measuring device for an oil-immersed transformer is improved on the basis of Example 1 or 2, wherein at least one group of axial guide bars 21 are provided on the inner wall of the outer sleeve 2, and an axial guide groove 31 slidably connected to the axial guide bar 21 is provided on the outer wall of the inner measuring tube 3.

[0040] like Figure 3 and Figure 4 As shown, two groups of axial guide bars 21 are symmetrically arranged on the inner wall of the outer sleeve 2 along the left-right direction, and two groups of axial guide grooves 31 are symmetrically arranged on the outer wall of the inner measuring tube 3. The axial guide bars 21 are slidably connected with the axial guide grooves 31 to guide the axial sliding of the inner measuring tube 3 and prevent the inner measuring tube 3 from rotating synchronously with the adjusting sleeve 4.

[0041] The other parts of this embodiment are the same as those of Embodiment 1 or 2, and thus will not be described in detail.

[0042] Embodiment 4:

[0043] An integrated temperature and pressure measuring device for an oil-immersed transformer is improved on the basis of any one of Embodiments 1-3, such as Figure 1 As shown, a protective sleeve 9 is sleeved on the outside of the bottom end of the inner measuring tube 3 , and a slow flow cavity 91 is arranged inside the protective sleeve 9 , and the slow flow cavity 91 is connected to the bottom ends of the first cavity 100 and the second cavity 200 .

[0044] The protective cover 9 is made of rubber material or plastic material. By installing the protective cover 9 at the bottom end of the inner measuring tube 3, the temperature sensor 6 and the pressure sensor 7 inside the bottom end of the inner measuring tube 3 are protected. At the same time, a slow flow cavity 91 is arranged inside the protective cover 9. The top of the slow flow cavity 91 is connected to the first cavity 100 and the second cavity 200 respectively, and the bottom of the slow flow cavity 91 is connected to the inside of the transformer box 1. The oil inside the transformer box 1 first enters the slow flow cavity 91, and then enters the first cavity 100 and the second cavity 200 after being buffered by the slow flow cavity 91, so as to avoid the oil from instantly rushing into the first cavity 100 and the second cavity 200 to damage the temperature sensor 6 and the pressure sensor 7.

[0045] Further, such as Figure 3 As shown, a filter screen 92 is provided on the bottom end and the side wall of the protective cover 9 , and the filter screen 92 can filter impurities in the oil to prevent the impurities from entering the first cavity 100 and the second cavity 200 along with the oil.

[0046] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they are not described again.

[0047] Embodiment 5:

[0048] An integrated temperature and pressure measuring device for an oil-immersed transformer is improved on the basis of any one of embodiments 1-4, wherein an axial sliding sealing ring is arranged between the outer wall of the inner measuring tube 3 and the inner wall of the outer sleeve 2. By setting the sliding sealing ring, the sealing between the inner measuring tube 3 and the outer sleeve 2 can be ensured, thereby preventing external impurities from entering the transformer box 1 through the gap between the outer wall of the inner measuring tube 3 and the inner wall of the outer sleeve 2. At the same time, the axial interactive sealing ring will not hinder the axial sliding of the inner measuring tube 3.

[0049] Furthermore, a cover 32 is provided at the top of the inner tube 3, and a cable hole is provided on the cover 32. The opening at the top of the inner tube 3 is blocked by the lamp cover 32 to prevent impurities from entering the inner tube 3. At the same time, a cable hole is provided on the cover 32 for leading out the cables of the temperature transformer 6 and the pressure sensor 7. In order to ensure the sealing of the cable hole, after the cable is led out, it is necessary to fill the cable hole with resin or sealant.

[0050] The other parts of this embodiment are the same as any one of Embodiments 1-4, so they are not described again.

[0051] Embodiment 6:

[0052] An integrated temperature and pressure measuring device for an oil-immersed transformer is improved on the basis of any one of embodiments 1-5, wherein the interior of the first cavity 100 and the second cavity 200 are filled with insulating resin, and after the insulating resin is cured, it can not only ensure the insulation of the inner measuring tube 3, but also can reinforce the temperature sensor 6 and the pressure sensor 7 through the cured insulating resin.

[0053] The other parts of this embodiment are the same as any one of Embodiments 1-5, so they are not described again.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. An integrated temperature and pressure measuring device for an oil-immersed transformer, comprising a transformer box (1), characterized in that: An outer sleeve (2) is inserted at the top of the transformer box (1), an inner tube (3) is coaxially slidably arranged inside the outer sleeve (2), and an outer thread is arranged on the outer side of the top of the inner tube (3); an adjustment sleeve (4) is coaxially rotatably arranged at the top of the outer sleeve (2), and the adjustment sleeve (4) is threadably connected to the corresponding outer thread; the interior of the inner tube (3) is divided into a first cavity (100) and a second cavity (200) by an axial partition (5), and a temperature sensor (6) and a pressure sensor (7) are arranged inside the first cavity (100) and the second cavity (200), respectively; the bottom ends of the first cavity (100) and the second cavity (200) are both in communication with the internal environment of the transformer box (1).

2. The integrated temperature and pressure measuring device for an oil-immersed transformer according to claim 1, characterized in that: A driving device (8) is provided on one side of the top end of the outer sleeve (2); a driving end of the driving device (8) is connected to the adjusting sleeve (4) and drives the adjusting sleeve (4) to rotate.

3. The integrated temperature and pressure measuring device for an oil-immersed transformer according to claim 2, characterized in that: The driving device (8) comprises an electric driving unit, the electric driving unit comprising a driving ring gear (81), a driving gear (82), and a driving motor (83), the driving ring gear (81) being sleeved on the top outer side of the adjusting sleeve (4), the driving motor (83) being arranged on one side of the top end of the outer sleeve (2), the driving gear (82) being sleeved on the output shaft of the driving motor (83), and the driving gear (82) being meshingly connected with the driving ring gear (81).

4. The integrated temperature and pressure measuring device for an oil-immersed transformer according to claim 3, characterized in that: The driving device (8) further comprises a manual driving part, wherein the manual driving part comprises a rotating handle arranged on the top of the adjustment sleeve (4).

5. An integrated temperature and pressure measuring device for an oil-immersed transformer according to any one of claims 1 to 4, characterized in that: At least one group of axial guide strips (21) is provided on the inner wall of the outer sleeve (2), and an axial guide groove (31) slidably connected to the axial guide strips (21) is provided on the outer wall of the inner tube (3).

6. The integrated temperature and pressure measuring device for an oil-immersed transformer according to claim 5, characterized in that: A protective sleeve (9) is sleeved on the outside of the bottom end of the inner measuring tube (3), and a slow flow cavity (91) is provided inside the protective sleeve (9), and the slow flow cavity (91) is communicated with the bottom ends of the first cavity (100) and the second cavity (200).

7. The integrated temperature and pressure measuring device for an oil-immersed transformer according to claim 6, characterized in that: A filter screen (92) is provided at the bottom end and on the side wall of the protective sleeve (9).

8. The integrated temperature and pressure measuring device for an oil-immersed transformer according to claim 7, characterized in that: An axial sliding sealing ring is provided between the outer wall of the inner measuring tube (3) and the inner wall of the outer sleeve (2).

9. The integrated temperature and pressure measuring device for an oil-immersed transformer according to claim 8, characterized in that: A sealing cover (32) is provided at the top end of the inner measuring tube (3), and a cable hole is provided on the sealing cover (32).

10. An integrated temperature and pressure measuring device for an oil-immersed transformer according to any one of claims 1 to 4, characterized in that: The first cavity (100) and the second cavity (200) are filled with insulating resin.

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