Water cooling device for oil-change transformer

Abstract

The utility model provides a water cooling device for an oil-change transformer, which comprises an oil-water heat exchanger provided with an oil inlet, an oil outlet, a water inlet and a water outlet, the oil outlet is connected to the oil inlet of the oil-change transformer through a pipeline, and transformer oil is cooled by external water flow; an oil inlet of the shield oil pump is connected to an oil outlet of the oil-to-oil transformer through a pipeline, an oil outlet of the shield oil pump is connected to an oil inlet of the oil-water heat exchanger through a pipeline, and the shield oil pump is used for pumping heat shield oil in the oil-to-oil transformer into the oil-water heat exchanger. The water cooling device for the oil-change transformer solves the problem that existing equipment has high requirements for environment temperature and space, and has the advantages of being low in requirement for environment space, high in adaptability, large in heat dissipation power density and high in cooling efficiency.

Description

Technical Field

[0001] The utility model relates to the field of heat dissipation, in particular to a water cooling device for an oil-transformer. Background Art

[0002] Transformers generate a lot of heat during operation. For oil-fired transformers, the internal oil temperature will continue to rise. Excessive temperature can affect the normal operation and lifespan of the transformer. Therefore, to ensure the normal operation of the oil-fired transformer, it is necessary to add some cooling devices to the outside of the transformer to remove the heat from the transformer and reduce the transformer oil temperature.

[0003] Most existing solutions involve adding fins to the transformer casing and cooling it through natural wind from the outside or adding a motor fan. This solution has low cooling efficiency.

[0004] Free air cooling refers to a method in which power transformers dissipate heat through natural convection, radiation, and conduction. This cooling method is suitable for small transformers or in environments with low ambient temperatures. Free air cooling transformers typically do not require additional cooling equipment, reducing equipment costs.

[0005] However, the natural air cooling method has low heat dissipation efficiency, high requirements for ambient temperature and location, occupies a large space, and is not suitable for scenarios with high ambient temperature and small space. The heat dissipation power density ratio is also low. Utility Model Content

[0006] The main purpose of the utility model is to provide a water cooling device for an oil-fired transformer, which overcomes the above technical problems.

[0007] In order to achieve the above purpose, the present invention proposes the following technical solutions:

[0008] A water cooling device for an oil-fired transformer, comprising:

[0009] The oil-water heat exchanger is provided with an oil inlet, an oil outlet, a water inlet and a water outlet. The oil outlet is connected to the oil inlet of the oil-transformer through a pipeline, and the external water flow is used to cool the transformer oil.

[0010] The shielded oil pump has its oil inlet connected to the oil outlet of the oil transformer through a pipeline, and its oil outlet is connected to the oil inlet of the oil-water heat exchanger through a pipeline, so as to pump the hot shielded oil in the oil transformer into the oil-water heat exchanger.

[0011] Furthermore, the water inlet of the oil-water heat exchanger is connected to an external cold water source to provide cold water for the oil-water heat exchanger.

[0012] Furthermore, the water outlet of the oil-water heat exchanger is connected to the outside world for discharging the hot water generated after heat exchange out of the oil-water heat exchanger.

[0013] Furthermore, it also includes a temperature control system to control the start and stop of the shielded oil pump.

[0014] Furthermore, a phase sequence protector is provided in the temperature control system to determine whether the wiring is correct.

[0015] Furthermore, the canned oil pump includes a canned motor and an oil pump, and the rotating shaft of the canned motor is coaxially connected to the rotating shaft of the oil pump.

[0016] Furthermore, an inlet valve is provided at the inlet of the oil-fired transformer water cooling device.

[0017] Furthermore, an outlet valve is provided at the outlet of the oil-fired transformer water cooling device.

[0018] Furthermore, a safety isolation channel is provided inside the oil-water heat exchanger to prevent liquid cross-contamination.

[0019] The utility model provides an oil-to-water transformer water cooling device, which solves the problem of existing equipment having high requirements on ambient temperature and space, and has the advantages of low requirements on ambient space, strong adaptability, relatively high heat dissipation power density and high cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 The figure is a schematic structural diagram of a water cooling device for an oil-fired transformer in one embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the installation state of the oil-fired transformer water cooling device in one embodiment of the present utility model.

[0023] Figure 3 The figure is a schematic diagram of the operation of the water cooling device for oil-fired transformer in one embodiment of the present invention.

[0024] Figure 4 This is a control logic diagram of the temperature control system in one embodiment of the present invention.

[0025] The above drawings include the following reference numerals:

[0026] 1. Oil-water heat exchanger; 2. Shielded oil pump; 3. Oil-to-water transformer; 4. Temperature control system; 5. Inlet valve; 6. Outlet valve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] 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 present application. As used herein, unless the context clearly indicates 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0030] Reference below Figures 1 to 4 , the utility model is further described:

[0031] A water cooling device for an oil-fired transformer, comprising:

[0032] The oil-water heat exchanger 1 is provided with an oil inlet, an oil outlet, a water inlet, and a water outlet. The oil outlet is connected to the oil inlet of the oil-to-water transformer 3 through a pipeline, and uses external water flow to cool the transformer oil;

[0033] The shielded oil pump 2, the oil inlet of the shielded oil pump 2 is connected to the oil outlet of the oil transformer 3 through a pipeline, and the oil outlet of the shielded oil pump 2 is connected to the oil inlet of the oil-water heat exchanger 1 through a pipeline, which is used to pump the hot shielded oil in the oil transformer 3 into the oil-water heat exchanger 1.

[0034] The canned oil pump 2 includes a canned motor and an oil pump, and the rotating shaft of the canned motor is coaxially connected to the rotating shaft of the oil pump.

[0035] In a preferred embodiment of the present invention, the shielded oil pump 2 has no dynamic mechanical seal, no leakage risk, and high reliability; the shielded motor and the oil pump are integrated into a whole, with internal self-cooling, no coupling, compact structure, and long trouble-free working time.

[0036] The water inlet of the oil-water heat exchanger 1 is connected to an external cold water source to provide cold water for the oil-water heat exchanger 1 , and the water outlet of the oil-water heat exchanger 1 is connected to the outside world to discharge the hot water generated after heat exchange out of the oil-water heat exchanger 1 .

[0037] In this embodiment, external water flow is used to cool the transformer oil. Water has a large specific heat capacity and high cooling efficiency, so a relatively ideal cooling effect can be achieved.

[0038] A safety isolation channel is provided inside the oil-water heat exchanger 1 to prevent liquid cross-contamination, that is, liquid cross-contamination will not occur even when the partition plate between the oil channel and the water channel fails, thereby improving the safety factor of the water cooling device and ensuring safe production.

[0039] In this embodiment, a phase sequence protector is further provided in the temperature control system 4 to determine whether the wiring is correct.

[0040] During the installation process, it is often impossible to directly determine from the outside whether the canned oil pump's rotation direction is correct. This application proposes a convenient way to determine whether the canned oil pump's electrical wiring is correct, thereby ensuring the correct rotation direction and avoiding the trouble and failure caused by incorrect wiring. By providing a phase sequence protector, the system alarm will not work when an electrical wiring error occurs. When the electrical wiring is correct, the system will clear the alarm and operate normally.

[0041] In this embodiment, a temperature control system 4 is further included to control the start and stop of the shielded oil pump 2 .

[0042] When the oil temperature exceeds a certain temperature, the water cooling device automatically starts, and when it falls below a certain temperature, the water cooling device automatically shuts down.

[0043] When the temperature control system 4 detects that the oil temperature is higher than the set value, the water cooling system will first check whether the phase sequence protector alarms. When the phase sequence protector alarms, the water cooling device stops working. When the phase sequence protector does not alarm, that is, the wiring is correct, the temperature control system 4 will send a command to start the shielded oil pump 2, and the water cooling device starts working to cool the oil in the oil-fired transformer 3.

[0044] In this embodiment, an inlet valve 5 and an outlet valve 6 are respectively provided at the inlet and outlet of the oil transformer water cooling device.

[0045] By setting the inlet valve 5 and the outlet valve 6, the opening and closing of the inlet and outlet can be controlled at any time as needed, which is convenient for maintenance and other work.

[0046] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0047] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A water cooling device for an oil-fired transformer, characterized in that: include: The oil-water heat exchanger (1) is provided with an oil inlet, an oil outlet, a water inlet, and a water outlet, wherein the oil outlet is connected to the oil inlet of the oil-transformer (3) through a pipeline, and utilizes external water flow to cool the transformer oil; A shielded oil pump (2), the oil inlet of the shielded oil pump (2) is connected to the oil outlet of the oil transformer (3) through a pipeline, and the oil outlet of the shielded oil pump (2) is connected to the oil inlet of the oil-water heat exchanger (1) through a pipeline, and is used to pump the heat shielding oil in the oil transformer (3) into the oil-water heat exchanger (1).

2. The water cooling device for oil-fired transformer according to claim 1, characterized in that: The water inlet of the oil-water heat exchanger (1) is connected to an external cold water source to provide cold water for the oil-water heat exchanger (1).

3. The water cooling device for oil-fired transformer according to claim 1, characterized in that: The water outlet of the oil-water heat exchanger (1) is connected to the outside world and is used to discharge hot water generated after heat exchange from the oil-water heat exchanger (1).

4. The water cooling device for oil-fired transformer according to claim 1, characterized in that: It also includes a temperature control system (4) for controlling the start and stop of the shielded oil pump (2).

5. The water cooling device for oil-fired transformer according to claim 4, characterized in that: The temperature control system (4) is provided with a phase sequence protector for judging whether the wiring is correct.

6. The water cooling device for oil-fired transformer according to claim 1, characterized in that: The canned oil pump (2) comprises a canned motor and an oil pump, wherein the rotating shaft of the canned motor is coaxially connected to the rotating shaft of the oil pump.

7. The water cooling device for oil-fired transformer according to claim 1, characterized in that: An inlet valve (5) is provided at the inlet of the water cooling device of the oil transformer.

8. The water cooling device for oil-fired transformer according to claim 1, characterized in that: An outlet valve (6) is provided at the outlet of the oil-transformer water cooling device.

9. The water cooling device for oil-fired transformer according to claim 1, characterized in that: A safety isolation channel is provided inside the oil-water heat exchanger (1) to prevent liquid cross-contamination.

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