阅读说明：本技术 用于液浸式变压器的多功能油位计 (Multifunctional oil level indicator for liquid immersed transformer ) 是由 徐健 张孝银 徐霄 于 2020-12-18 设计创作，主要内容包括：本发明属于液浸式变压器技术领域,具体涉及一种用于液浸式变压器的多功能油位计,包括连杆以及安装在管体上端部的压力释放阀；所述管体远离压力释放阀的一端与变压器箱盖相连接,所述连杆置于管体内,连杆的下端伸入变压器内与油浮相连接,连杆的上端与浮标指示器相连接,管体上设有用于查看浮标指示器的观察窗；还包括上压盖、环形油杯、透明筒体和下压盖,所述环形油杯为中部中空的横截面为U型的环形结构,环形油杯的外环端面上设有朝外凸起的定位安装环,定位安装环置于上压盖和透明筒体之间,定位安装环上设有若干径向贯穿的空气流通孔。本发明将呼吸、油位指示、压力释放等功能集中到油位计上,实现了一套装置完成多项功能。(The invention belongs to the technical field of liquid immersed transformers, and particularly relates to a multifunctional oil level gauge for a liquid immersed transformer, which comprises a connecting rod and a pressure release valve arranged at the upper end part of a pipe body; one end of the pipe body, which is far away from the pressure release valve, is connected with a transformer tank cover, the connecting rod is arranged in the pipe body, the lower end of the connecting rod extends into the transformer and is connected with the oil float, the upper end of the connecting rod is connected with the float indicator, and the pipe body is provided with an observation window for checking the float indicator; the oil cup is of a U-shaped annular structure with a hollow cross section in the middle, a positioning mounting ring protruding outwards is arranged on the outer ring end face of the annular oil cup, the positioning mounting ring is arranged between the upper gland and the transparent barrel, and a plurality of radially-penetrating air circulation holes are formed in the positioning mounting ring. The invention integrates the functions of respiration, oil level indication, pressure release and the like on the oil level gauge, thereby realizing that one set of device can complete multiple functions.)

1. A multi-functional oil level gaugember for liquid-immersed transformer, characterized in that: comprises a connecting rod (12) and a pressure release valve (1) arranged at the upper end part of a pipe body (11); one end, far away from the pressure release valve (1), of the pipe body (11) is connected with a transformer tank cover (10), the connecting rod (12) is arranged in the pipe body (11), the lower end of the connecting rod (12) extends into the transformer and is connected with an oil float (13), the upper end of the connecting rod (12) is connected with the buoy indicator (2), and an observation window (11-1) used for viewing the buoy indicator (2) is arranged on the pipe body (11);

the oil pump is characterized by further comprising an upper gland (3), an annular oil cup (4), a transparent cylinder body (6) and a lower gland (8), wherein the annular oil cup (4) is of an annular structure with a hollow middle part and a U-shaped cross section, a positioning installation ring (4-1) protruding outwards is arranged on the outer ring end face of the annular oil cup (4), the positioning installation ring (4-1) is arranged between the upper gland (3) and the transparent cylinder body (6), and a plurality of radially-penetrating air circulation holes (4-2) are formed in the positioning installation ring (4-1); one end, far away from the annular oil cup (4), of the transparent cylinder body (6) is supported on a lower gland (8), the upper gland (3) and the lower gland (8) are sleeved on the pipe body (11), a positioning bulge (11-2) is arranged on the outer side of the pipe body (11), and the bottom of the lower gland (8) is in contact with the positioning bulge (11-2); the transformer oil (5) is filled in the annular oil cup (4), the transparent cylinder (6) below the annular oil cup (4) is filled with the color-changing silica gel (7), the tube body (11) is also provided with a radial through hole (11-3), and the radial through hole (11-3) leads to the inner space of the transparent cylinder (6) below the color-changing silica gel (7); an annular groove (3-1) with an L-shaped section is arranged below the upper gland (3), the positioning mounting ring (4-1) is clamped in the annular groove (3-1), the side walls of two sides of the annular groove (3-1) are not contacted with the positioning mounting ring (4-1), and the oil level of the transformer oil (5) is higher than the inner side groove port of the annular groove (3-1); the observation window (11-1) is positioned above the upper gland (3).

2. The multifunctional oil level indicator for liquid-immersed transformer according to claim 1, wherein: the tube body (11) is in threaded connection with the transformer box cover (10) through a base nut (9).

3. The multifunctional oil level indicator for liquid-immersed transformer according to claim 2, characterized in that: the inner ring and the outer ring of the base nut (9) are both provided with threads, and the internal thread of the base nut (9) is matched with the external thread on the pipe body (11); the external thread of the base nut (9) is matched with the internal thread on the transformer box cover (10).

4. The multifunctional oil level indicator for liquid-immersed transformer according to claim 1, wherein: the transparent cylinder (6) is made of glass.

5. The multifunctional oil level indicator for liquid-immersed transformer according to claim 1, wherein: the air circulation hole (4-2) is integrally positioned in the annular groove (3-1).

6. The multifunctional oil level indicator for liquid-immersed transformer according to claim 1, wherein: six air circulation holes (4-2) are annularly and uniformly distributed.

Technical Field

The invention belongs to the technical field of liquid immersed transformers, and particularly relates to a multifunctional oil level indicator for a liquid immersed transformer.

Background

The existing oil level gauge for the liquid-immersed transformer has a single function and only has the function of detecting the oil level, and actually the transformer needs the assistance of various additional devices in the operation process to ensure the normal operation of the transformer, for example, when the transformer operates, the temperature of a transformer winding and an iron core changes along with the change of the load size and the external environment temperature, so that the volume of transformer oil changes along with the change of the volume, and an oil tank is expanded along with the increase of the pressure in the transformer, and at this time, the heat radiating fins of the transformer need to adopt expandable corrugated fins or an oil storage cabinet and a moisture absorber need to be added. If the temperature of the transformer oil rises due to faults, load condition changes and the like in the operation of the transformer, or a large amount of gas is instantaneously generated due to reasons of partial discharge, overheating and the like, and the forward pressure in the oil tank reaches a certain limit value, the release device needs to be opened to release the pressure in the oil tank, so that the oil tank is prevented from being damaged.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the multifunctional oil level indicator for the liquid immersed transformer, and the multifunctional oil level indicator integrates the functions of respiration, oil level indication, pressure release and the like on the oil level indicator, so that one set of device can complete multiple functions.

The invention is realized by the following technical scheme: a multifunctional oil level indicator for a liquid immersed transformer comprises a connecting rod and a pressure release valve arranged at the upper end part of a pipe body; one end of the pipe body, which is far away from the pressure release valve, is connected with a transformer tank cover, the connecting rod is arranged in the pipe body, the lower end of the connecting rod extends into the transformer and is connected with the oil float, the upper end of the connecting rod is connected with the float indicator, and the pipe body is provided with an observation window for checking the float indicator;

the oil cup is of an annular structure with a hollow middle part and a U-shaped cross section, a positioning mounting ring protruding outwards is arranged on the outer ring end face of the annular oil cup and is arranged between the upper gland and the transparent cylinder, and a plurality of radially penetrating air circulation holes are formed in the positioning mounting ring; one end of the transparent cylinder body, which is far away from the annular oil cup, is supported on the lower gland, the upper gland and the lower gland are sleeved on the pipe body, a positioning bulge is arranged on the outer side of the pipe body, and the bottom of the lower gland is in contact with the positioning bulge; transformer oil is filled in the annular oil cup, the transparent cylinder body below the annular oil cup is filled with allochroic silica gel, and the pipe body is also provided with a radial through hole which leads to the inner space of the transparent cylinder body below the allochroic silica gel; an annular groove with an L-shaped section is arranged below the upper gland, the positioning mounting ring is clamped in the annular groove, the side walls of two sides of the annular groove are not contacted with the positioning mounting ring, and the oil level of the transformer oil is higher than the port of the inner side groove of the annular groove; the observation window is positioned above the upper gland.

Further, the pipe body is in threaded connection with the transformer tank cover through a base nut.

Furthermore, the inner ring and the outer ring of the base nut are both provided with threads, and the internal threads of the base nut are matched with the external threads on the pipe body; the external thread of the base nut is matched with the internal thread on the transformer tank cover.

Further, the transparent cylinder is made of glass.

Further, the air flow hole is located entirely within the annular groove.

Furthermore, six air circulation holes are annularly and uniformly distributed.

The connecting rod is arranged in the pipe body, the lower end of the connecting rod is connected with the oil float, the upper end of the connecting rod is connected with the buoy indicator, the oil level in the transformer can be known by transmitting the oil level in the transformer to the buoy indicator through the oil float, and observing the buoy indicator through the observation window.

The upper end of the pipe body is provided with the pressure release valve, when the temperature of transformer oil rises due to faults, load condition changes and the like in the running process of the transformer, or a large amount of gas is instantaneously generated due to reasons of partial discharge, overheating and the like, the forward pressure in the oil tank reaches a certain limit value, and the pressure release valve is opened to release the pressure in the oil tank, so that the oil tank is prevented from being damaged.

When transformer oil is cooled and sucked, external air enters through the air flow through hole of the annular oil cup, the external air is filtered through the transformer oil and the allochroic silica gel, and the external air enters the transformer through the radial through hole in the tube body after moisture in the air is filtered; the path is reversed on expiration.

The invention has the beneficial effects that: 1. the oil level gauge has the functions of breathing, oil level indication, pressure release and the like, free breathing is realized due to the temperature change of the winding under the condition that the transformer has no fault, the internal pressure of the oil tank is ensured to be equal to the external pressure, and the condition that the oil tank is damaged due to pressure unbalance is avoided;

2. the oil level indicator is directly arranged on the transformer tank cover, and is simple and reasonable in structure and convenient to install.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

FIG. 3 is a schematic view of the installation of the present invention;

in the figure, 1, a pressure release valve, 2, a buoy indicator, 3, an upper gland, 3-1, an annular groove, 4, an annular oil cup, 4-1, a positioning installation ring, 4-2, an air flow through hole, 5, transformer oil, 6, a transparent cylinder, 7, allochroic silica gel, 8, a lower gland, 9, a base nut, 10, a transformer box cover, 11, a pipe body, 11-1, an observation window, 11-2, a positioning bulge, 11-3, a radial through hole, 12, a connecting rod, 13 and an oil float.

Detailed Description

The invention is further illustrated below with reference to the figures and examples.

As shown in fig. 1 to 3, a multifunctional oil level gauge for a liquid immersion type transformer includes a connecting rod 12 and a pressure relief valve 1 installed at an upper end of a pipe body 11; one end, far away from the pressure release valve 1, of the pipe body 11 is connected with a transformer tank cover 10, the pipe body 11 is in threaded connection with the transformer tank cover 10 through a base nut 9, threads are arranged on the inner ring and the outer ring of the base nut 9, and internal threads of the base nut 9 are matched with external threads on the pipe body 11; the external thread of the base nut 9 is matched with the internal thread on the transformer tank cover 10. The connecting rod 12 is arranged in the tube body 11, the lower end of the connecting rod 12 extends into the transformer and is connected with the oil float 13, the upper end of the connecting rod 12 is connected with the float indicator 2, and the tube body 11 is provided with an observation window 11-1 for checking the float indicator 2;

the oil cup is characterized by further comprising an upper gland 3, an annular oil cup 4, a transparent cylinder 6 and a lower gland 8, wherein the annular oil cup 4 is of an annular structure with a hollow middle section and a U-shaped cross section (namely the annular oil cup 4 is formed by rotating the U-shaped structure for 360 degrees around the axis on the outer side of the U-shaped structure and parallel to the direction of the U-shaped opening, a hollow structure is formed in the middle of the rotating body and is used for air circulation, a positioning installation ring 4-1 protruding outwards is arranged on the outer ring end face of the annular oil cup 4, the positioning installation ring 4-1 is arranged between the upper gland 3 and the transparent cylinder 6, a plurality of air through holes 4-2 penetrating in the radial direction are formed in the positioning installation ring 4-1, so that external air can circulate to the inside of the annular oil cup 4 through the air through holes 4-2 and then flow to the inside of the transparent cylinder 6 from the hollow middle section of the, conversely, the gas inside the transparent cylinder 6 can be made to pass from the air flow hole 4-2 to the atmosphere; one end of the transparent cylinder 6, which is far away from the annular oil cup 4, is supported on a lower gland 8, the upper gland 3 and the lower gland 8 are sleeved on a pipe body 11, a positioning bulge 11-2 is arranged on the outer side of the pipe body 11, and the bottom of the lower gland 8 is in contact with the positioning bulge 11-2; the transformer oil 5 is filled in the annular oil cup 4, the transparent cylinder 6 below the annular oil cup 4 is filled with the allochroic silica gel 7, the allochroic silica gel 7 is arranged in the transparent cylinder 6 through a breathable wire mesh, and the transparent cylinder 6 is made of glass. As shown in fig. 3, in the air path, when transformer oil is cooled and sucked, external air enters through an air flow through hole 4-2 of an annular oil cup 4, the external air is filtered through transformer oil 5 and allochroic silica gel 7, and the external air is filtered to remove moisture in the air and then enters the interior of the transformer through a radial through hole 11-3 on a tube body 11; the path is reversed on expiration. Allochroic silica gel 7 is mostly blue or white granule, and allochroic silica gel 7 turns yellow along with water content's rising colour gradually, sees through transparent barrel 6 and can observe the colour change of allochroic silica gel 7, treats that allochroic silica gel 7 changes to change allochroic silica gel 7 after turning yellow promptly, and the moisture when avoiding influencing follow-up outside air flow to transformer inside filters.

An annular groove 3-1 with an L-shaped section is arranged below the upper gland 3, the positioning mounting ring 4-1 is clamped in the annular groove 3-1, the air through hole 4-2 is integrally positioned in the annular groove 3-1, the side walls of the two sides of the annular groove 3-1 are not contacted with the positioning mounting ring 4-1, and the oil level of the transformer oil 5 is higher than the inner side groove port of the annular groove 3-1. The side walls of the two sides of the annular groove 3-1 are not in contact with the positioning mounting ring 4-1, so that the air circulation inside and outside the air through hole 4-2 is not influenced, and the air through hole 4-2 is integrally positioned in the annular groove 3-1, so that rainwater and the like are prevented from entering the annular oil cup 4 from the air through hole 4-2. The oil level of the transformer oil 5 is higher than the port of the inner side groove of the annular groove 3-1, so that the air flowing in from the outside is filtered by the transformer oil 5 and then flows into the transparent cylinder 6 from the middle hollow structure of the annular oil cup 4, and is filtered for the second time by the allochroic silica gel 7.

The design discloses an integral type oil level gaugember with breathe, oil level are instructed, pressure release function, and the oil floats and cooperates with the buoy indicator, observes the buoy indicator through the observation window and can know the oil level condition in the transformer.

The upper end of the oil level gauge is provided with a pressure release valve, when the temperature of transformer oil rises due to faults, load condition changes and the like in the running process of a transformer, or a large amount of gas is instantaneously generated due to reasons of partial discharge, overheating and the like, the forward pressure in the oil tank reaches a certain limit value, and the pressure release valve is opened to release the pressure in the oil tank, so that the oil tank is prevented from being damaged.

The breathing function comprises an upper gland, a lower gland, an annular oil cup, a transparent cylinder, allochroic silica gel and the like, wherein a certain amount of transformer oil is filled in the annular oil cup, six air circulation holes are formed in the positioning mounting ring along the circumferential direction, and radial through holes for air circulation are also formed in the pipe body.

When the transformer has no fault, the temperature of the transformer body cannot rise or fall quickly, the flow of the breathing function can meet the breathing of internal gas, when the transformer has a fault, the gas is accumulated instantly, the breathing function cannot meet the discharge of the internal gas, and after a certain pressure is reached, the pressure release valve acts to discharge the gas quickly, so that the oil tank is prevented from being damaged.