KR20240077473A - Heavy electric machine with cooling system - Google Patents

Abstract

The present invention improves the cooling structure of heavy electrical equipment such as electric motors and transformers. According to the present invention, it includes an electric motor and a cooling device. And the electric motor is connected to a first piping line and a second piping line, and the cooling device receives air inside the electric motor through the first piping line and supplies cooled air through the second piping line. It is configured to supply inside the electric motor. At this time, the cooling device is a turbo cooler that uses an inverter and has an automatic temperature control function. According to this configuration, it can provide sufficient cooling performance even compared to existing cooling structures, while reducing installation, management, and operating costs.

Description

Heavy electric machine with cooling system}

The present invention relates to a cooling structure for heavy electric equipment, and more specifically, to a heavy electric equipment having a cooling device that improves the cooling structure of heavy electric equipment such as electric motors or transformers to reduce overall cost and energy, management and operation costs, etc. It's about.

Heavy electrical equipment refers to various equipment used in the power infrastructure that supplies electrical energy to consumers. Examples may include generators, transformers, electric motors, etc. These heavy electric devices are important devices in the operation of power generation facilities, and when they break down, they can cause serious problems such as power generation interruption.

One of the causes of failure may be the failure to properly cool the internal heat resulting from the operation of heavy electric equipment, causing the heavy electric equipment to be driven outside the normal temperature range. For example, in the case of an electric motor, heat is generated due to friction as the rotor is driven. When heat is generated in the motor, the temperature rises, causing the electric motor to not operate smoothly.

Therefore, heavy electrical equipment such as electric motors and transformers include a cooling structure to maintain an appropriate temperature for normal operation. However, the conventional cooling structure provided in heavy electric equipment requires a cooling tower and components to drive it for electric motors, and components such as cooling fans and radiators are absolutely necessary for transformers. This has the disadvantage of increasing overall costs.

The present invention was developed to solve the above problems, and provides a heavy electric equipment that can provide a sufficient cooling effect even without including components such as existing cooling towers, radiators, and cooling fans.

A heavy electric machine having a cooling device according to an embodiment of the present invention for achieving this purpose includes an electric motor and a cooling device, and the electric motor is connected to a first piping line and a second piping line. , the cooling device receives air inside the electric motor through the first piping line and supplies cooled air into the electric motor through the second piping line, and the cooling device operates the drive motor for air cooling. It uses an inverter to control the driving force, and is characterized as a turbo cooler with an automatic temperature control function so that the air inside the supplied electric motor is below a predetermined temperature.

In an embodiment, the turbo cooler provides a configuration that receives heated air inside the electric motor through a pipe, cools it, and supplies air with reduced heat back to the electric motor.

In an embodiment, the turbo cooler may include a compressor that sucks low-pressure refrigerant and compresses it into high-pressure refrigerant, a condenser, an expansion valve, and an evaporator to form a refrigeration cycle.

Fans for smooth transfer of air are installed at one end of the first pipe line and the second pipe line, respectively.

A heavy electric machine having an improved cooling device according to another embodiment of the present invention includes an electric transformer and a turbo cooler for oil circulation, wherein the transformer includes a transformer frame on which an oil outlet and an oil inlet are formed, The turbo cooler for oil circulation includes an oil circulation line connected to the oil discharge port and the oil inlet port; and a cooling module that cools the oil moving along the oil circulation line. Here, the cooling module is installed adjacent to the oil circulation line and exchanges heat with oil moving along the oil circulation line.

Sensors that detect gas and oil temperatures generated in the transformer; and an unmanned operation system that controls the operation of the transformer and the turbo cooler for oil circulation according to the sensed type and amount of gas and oil temperature, and the unmanned operation system is configured to enable remote control.

According to the present invention, the cooling method of heavy electric equipment such as electric motors and transformers has been improved by using a high-speed turbo cooler. Therefore, in the case of a conventional electric motor, the cooling tower that must be installed, the piping line that must be connected to the cooling tower, and the pump or driving device for circulating water through the piping line can be eliminated. Also, in the case of a transformer, the radiator and cooling fan for cooling it can be removed.

Therefore, according to the present invention, compared to conventional cooling facilities for heavy electric equipment as a whole, it is possible to reduce the size of heavy electric equipment while providing the same or better cooling performance, and has the effect of efficiently reducing installation costs and operating costs.

Figure 1 is a diagram showing an electric motor and an electric motor cooling structure according to the prior art.
Figure 2 is a diagram showing the configuration of an electric motor to which a cooling device is applied according to an embodiment of the heavy electric equipment of the present invention.
Figure 3 is a diagram showing a transformer and a transformer cooling structure according to the prior art.
Figure 4 is a diagram showing the configuration of a transformer to which a cooling device is applied according to an embodiment of the heavy electric equipment of the present invention.

Since the present invention can be modified in various ways and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

The terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Spatially relative terms such as below, beneath, lower, above, upper, etc. facilitate the correlation between one element or component and other elements or components as shown in the drawing. It can be used to describe. Spatially relative terms should be understood as terms that include different directions of the element during use or operation in addition to the direction shown in the drawings. For example, when an element shown in a drawing is turned over, an element described as below (below, beneath) another element may be placed above (upper) the other element. Accordingly, the illustrative term below may include both downward and upward directions. Elements can also be oriented in other directions, so spatially relative terms can be interpreted according to orientation.

As used in the present invention, expressions indicating a part such as “part” or “part” mean that the corresponding component is a device that can include a specific function, software that can include a specific function, or a device that can include a specific function. It means that it can represent a combination of and software, but it cannot be said that it is necessarily limited to the expressed functions. This is only provided to help a more general understanding of the present invention, and is provided to those with ordinary knowledge in the field to which the present invention pertains. Various modifications and variations are possible from this description.

In addition, it should be noted that all electrical signals used in the present invention are examples, and if an inverter or the like is additionally provided in the circuit of the present invention, the signs of all electrical signals to be described below may be reversed. Therefore, the scope of the present invention is not limited to the direction of the signal.

Accordingly, the spirit of the present invention should not be limited to the described embodiments, and the scope of the patent claims described below as well as all things that are equivalent or equivalent to the scope of this patent claim shall fall within the scope of the spirit of the present invention. .

The present invention changes the cooling structure of heavy electric equipment and proposes more diverse effects than the prior art. Therefore, the present invention will be examined by comparing electric motors and transformers among heavy electric equipment with the conventional cooling structure.

Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings.

Figure 1 is a diagram showing an electric motor and an electric motor cooling structure according to the prior art.

Electric motors generate frictional heat as the rotor drives, and it is necessary to cool the internal temperature of the electric motor as it rises due to frictional heat. An example of a cooling structure for an electric motor is a method using a water-cooled cooler.

As shown in FIG. 1, the water-cooled cooling method includes an electric motor 100, and a cooling tower 110, a pump 120, etc. are configured to cool the electric motor 100. In this water-cooled cooling structure, the water (cooling water) cooled in the cooling tower 110 is supplied to the electric motor 100 through a pipeline and circulated, and the water heated in the electric motor 100 is returned to the cooling tower 110 and recycled again. It is a cooling method.

However, the water-cooled cooling structure requires a cooling tower 110 to cool the water, and a piping line 130 with the electric motor 100 and a pump 120 are installed to circulate water through the piping line 130. It has to be. As such, the water-cooled cooling structure has the disadvantage of being operated in a high-cost structure that incurs equipment costs and management costs.

Figure 2 is a diagram showing the configuration of an electric motor employing a cooling device according to an embodiment of the heavy electric equipment of the present invention.

Referring to Figure 2, it includes an electric motor 200 and a turbo cooler 210 connected to the electric motor 200. The electric motor 200 is installed within the electric motor frame, and the turbo cooler 210 is connected to the electric motor 200 through piping lines 220a and 220b. Since the electric motor 200 and the turbo cooler 210 can be installed close to each other, the total length of the piping lines 220a and 220b can be made much shorter than before. It is also possible to construct one large frame and install the electric drive (200) and turbo cooler (210) together.

The electric motor 200 is a device that generates and transmits rotational force by causing the rotor to rotate through electromagnetic interaction between the stator and the rotor.

The turbo cooler 210 is configured to cool the hot air inside the electric motor 200. The turbo cooler 210 receives heated air inside the electric motor 200 through pipes 220a and 220b, cools it, and supplies air with reduced heat back to the electric motor 200. The turbo cooler 210 of this embodiment uses an inverter and has an automatic temperature control function.

Although not shown in the drawing, the turbo cooler 210 includes a compressor that sucks low-pressure refrigerant and compresses it into high-pressure refrigerant, a condenser, an expansion valve, and an evaporator to form a refrigeration cycle. In addition, one or more impellers that rotate by the driving force of the drive motor to compress the refrigerant, a diffuser, and a housing in which the impellers are accommodated may be included. And the turbo cooler 210 is installed with a turbo motor that generates rotational force, and a refrigerator fan that is connected to one side of the turbo motor and rotates by the rotational force of the turbo motor.

The piping line connecting the electric motor 200 and the turbo cooler 210 includes a first piping line 220a and a second piping line 220b. The first piping line 220a is a piping line that supplies heated air from the electric motor 200 to the turbo cooler 210, and the second piping line 220b is a piping line that supplies cooled air back to the electric motor 200. It's a line. A fan may be installed at one end of the first pipe line 220a and the second pipe line 220b to ensure smooth transfer of air.

According to the present invention configured as described above, as the electric motor 200 is driven, internal heat will be supplied to the turbo cooler 210 along the first piping line 220a. Then, the turbo cooler 210 cools it to a predetermined temperature or lower and then supplies it to the electric motor 200 again. Therefore, the inside of the electric motor 200 can always maintain a constant temperature, so the electric motor 200 can always be driven under optimal conditions.

In this way, according to the present invention, according to the cooling structure including the electric motor 200 and the turbo cooler 210, a cooling tower is not required, and a structure for circulating coolant (i.e., a pump, etc.) is not required and costs are incurred accordingly. won't do it. And the installation space can be made smaller. Compared to the cooling structure of a conventional electric motor, the structure can be simplified, thereby reducing overall manufacturing, management, and operating costs.

Figure 3 is a diagram showing a transformer and a transformer cooling structure according to the prior art.

Looking at the cooling structure as shown in FIG. 3, radiators 310 are installed on both sides of the transformer 300 and the oil of the transformer 300 to cool it. A cooling fan 320 is attached to the radiator 310. Therefore, the cooling fan 320 is driven between the radiators 310 to lower the oil temperature through natural cooling.

Looking at FIG. 3, it can be seen that the structure of the radiator 310 for oil cooling is larger than that of the transformer 300. As such, in the conventional case, large radiators 310 must be installed on both sides of the transformer 300, which causes the problem of increasing the overall size of the transformer 300. In other words, since the transformer itself is small but must include a cooling structure, the size of the transformer 300 has no choice but to become substantially larger.

Figure 4 is a diagram showing the configuration of a transformer employing a cooling device according to an embodiment of the heavy electric equipment of the present invention.

During operation, the transformer 400 generates heat due to joule loss due to resistance of the winding, hysteresis loss due to alternating magnetic flux in the iron core, and eddy current loss occurring in the iron core or case, and if heat dissipation is insufficient, the temperature rises. This causes deterioration of the insulator, so a device to cool the transformer oil is needed.

Looking at the cooling structure according to FIG. 4, it includes a transformer 400, a transformer frame 410, and a turbo cooler 500 for oil circulation.

An oil outlet 420a and an oil inlet 420b are formed in the transformer frame 410.

The turbo cooler 500 for oil circulation is connected to an oil outlet 420a and an oil inlet 420b. The oil outlet 420a and the oil inlet 420b are connected to a circulation line 510 inside the turbo cooler 500 for oil circulation. ) is connected to. And a cooling module 520 is installed on the circulation line 510 side. The cooling module 520 is configured to cool the oil moving along the circulation line 510.

According to this configuration, the transformer oil used for the purpose of insulating and cooling the transformer 400 is delivered to the oil circulation turbo cooler 500 through the oil discharge port 420a, and then the oil circulation turbo cooler 500 It flows along the circulation line 510 and is cooled by the cooling module 520. Then, the cooled transformer oil is supplied back to the transformer 400 through the oil inlet 420b.

In this way, the oil circulation turbo cooler 500 can cool the transformer oil and then supply it back to the transformer 400, thereby performing the functions of a conventional radiator and cooling fan. Therefore, according to this embodiment, the radiator and cooling fan can be removed, thereby reducing the overall size.

Meanwhile, the transformer configuration to which the cooling device of the present invention is applied may include a sensor 430 and an unmanned operation system 600.

The sensor 430 may be a gas detection sensor or an oil temperature measurement sensor. In the case of a sensor for gas detection, it is installed inside the transformer frame 410 to automatically detect various gases generated in the transformer 400, and in the case of a sensor for oil temperature measurement, it measures the oil temperature for the transformer 400. And the unmanned operation system 600 receives sensing values from the sensors 430 and controls the operation of the transformer 400 or the turbo cooler 500 for oil circulation. The unmanned driving system 600 includes wired/wireless communication means so that an administrator can control it from a remote location.

By attaching a turbo cooler for oil circulation to the transformer, the size of the transformer can be reduced to about 1/3 and the weight can be reduced.

As described above, the present invention is described with reference to the illustrated embodiments, but these are merely illustrative examples, and those of ordinary skill in the art to which the present invention pertains can make various modifications without departing from the gist and scope of the present invention. It will be apparent that variations, modifications, and equivalent other embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached claims.

100: electric motor
210: turbo cooler
220a, 220b: 1st pipe line, 2nd pipe line
400: Transformer
410: Transformer frame
420a: Oil outlet
420b: Oil inlet
430: sensor
500: Turbo cooler for oil circulation
510: circulation line
520: Cooling module
600: Unmanned driving system

Claims (2)

Heavy electrical equipment used in power infrastructure that supplies electrical energy to recipients It includes a transformer (electric transformer) and a turbo cooler for oil circulation to cool the transformer,
The transformer includes a transformer frame formed with an oil outlet and an oil inlet,
The oil circulation turbo cooler includes an oil circulation line connected to the oil discharge port and the oil inlet port; and a cooling module that cools the oil moving along the oil circulation line,
The cooling module is installed on the oil circulation line side to exchange heat with oil moving along the oil circulation line,
By applying a cooling structure in which the oil circulation turbo cooler, which functions as a radiator and cooling fan, cools the oil of the transformer,
Heavy electric equipment having a cooling device, characterized in that the radiator and cooling fan installed to cool the transformer and the oil of the transformer are removed. According to claim 1,
Sensors that detect gas and oil temperatures generated in the transformer; and
It further includes an unmanned operation system that controls the operation of the transformer and the turbo cooler for oil circulation according to the detected type and amount of gas and oil temperature,
The unmanned driving system is a heavy electrical equipment having a cooling device configured to enable remote control.