KR20200025012A - Device Interrupting Shock Torque Generated From Generator by Surge of Power System - Google Patents

Abstract

The present invention relates to a power transmission device for transmitting the power of a turbine and a generator, and more specifically, to a power transmission device which has a shaft, wherein both ends of the shaft are connected to the turbine and the generator, respectively, and a notch is formed on a rotating pillar provided between the both ends.

Description

Device Interrupting Shock Torque Generated From Generator by Surge of Power System}

The present invention relates to power transmission between a shaft of a generator and a shaft of a gas turbine, and more particularly, to a safety device that is formed between each shaft to block the transmission of shock torque generated in the generator.

In general, as shown in FIG. 1, the power generation apparatus includes a turbine T for rotating chemical energy into kinetic energy while rotating about a rotation axis R and a turbine T while rotating around a rotation axis R. It is composed of a generator (G) receives the generated kinetic energy and converts it into electrical energy.

Kinetic energy is transmitted from the turbine (T) to the generator (G) while generating torque through the rotation of the shaft. The rotation speed of the shaft is maintained at 3600rpm, and the shaft needs strong rigidity to withstand the torque generated during rotation.

Further, as the output of the turbine T and the power generating capacity of the generator G become larger, the generated torque increases, and a high-performance shaft is required.

On the other hand, during operation using the turbine (T) and the generator (T), an emergency situation such as a surge (Surge) of the power system may occur. Surge in the power system is an abnormal and sudden flow of current for reasons such as lightning strikes or short circuits of the wires, which can overload the generator (G).

When a surge occurs during the operation of the generator (G), the generator (G) does not produce electricity, but serves as an electric motor that consumes electric power by the surge, thereby making an abnormal operation.

When the surge occurs as described above, the generator (G) rotates the shaft while acting as an electric motor, the torque generated at this time is less than several times to ten times more than the torque in a normal situation.

In the related art, a method of increasing the design torque of the shaft was selected to protect the shaft from damage due to the surge, and the shaft was enlarged and overdesigned accordingly.

Although damage to the shaft can be prevented from torque due to surge through the enlargement and overdesign of the shaft, there is a problem that the power transmission efficiency can be reduced through the enlargement of the shaft. There is an increase in manufacturing and transport costs, and there is a need for improvement.

In addition to the method of oversizing and overdesigning the shaft, an actuator may be considered to prevent a sudden surge, but the actuator takes a reaction time of about 50 ms, which is the time that the shaft can rotate about three times. In order to prevent the shaft from being damaged, a more immediate response is required, but it is not actually applied.

Patent Publication No. 10-2018-0073397

It is an object of the present invention to provide a power transmission device in which a specific part is damaged when a sudden torque change occurs in a power transmission process of a turbine and a generator.

In the power transmission device for transmitting the power of the turbine and the generator according to an embodiment of the present invention for achieving this object, a shaft is provided, both ends of the shaft are connected to the turbine and the generator, respectively, A notch is formed in the rotating column provided between both ends.

In addition, a guard is provided on the outside of the shaft, the guard may include a guard plate formed in a direction parallel to the central axis.

In addition, at least one auxiliary pillar may be formed in the direction of the central axis in the protective plate.

In addition, an outer bearing may be provided between the auxiliary pillar and the rotary pillar.

In addition, the notch may be formed between the auxiliary pillar.

In addition, the shaft consists of a female coupling disc and a male coupling disc, wherein the female coupling disc and the male coupling disc can be bound by one or more fasteners.

In addition, the fixture includes a fixing pin, the notch may be formed on the fixing pin.

In addition, the fixture includes a fixing plate, the fixing plate may be provided on both sides based on the notch.

In addition, a female disc inner pillar is formed on the female coupling disk, a protrusion is formed on the inner pillar of the female disk, an inner male disk is formed on the male coupling disk, and an inner male disk upper surface is formed on the inner male disk. The groove may be formed on an upper surface of the inner male disc, and the protrusion may be inserted into the groove.

In addition, an inner bearing may be provided between the protrusion and the groove.

As described above, according to the power transmission device of the present invention, as the notch is formed in the rotational column provided between the female coupling disk and the male coupling disk, when the torque change occurs more than a certain level, the corresponding notch is destroyed, thereby preventing shock transmission. can do.

In addition, as the guard is formed, debris of the notch is not exposed to the outside, thereby improving safety.

Furthermore, as the auxiliary pillar is formed, the rotating pillar may not be separated from the rotating shaft.

Moreover, as the outer bearings are formed in the auxiliary pillar and the rotating pillar, friction between the rotating pillar and the auxiliary pillar can be reduced.

In addition, as the notch is formed between the auxiliary pillars, the fragments of the notch may be prevented from being exposed to the outside, thereby further improving safety.

Furthermore, as the shaft consists of a female coupling disc and a male coupling disc and is bound by the fixture, the repair, maintenance and repair of the power transmission device can be simplified.

In addition, as the notch is formed on the fixing pin of the fixture, the strength at which the fixing pin is broken can be easily designed, and the site to be broken can be specified, thereby simplifying repair, maintenance and repair.

On the other hand, as the protrusions are drawn in the grooves, the central axes of the female coupling disc and the male coupling disc may not be separated from the rotation axis.

In addition, as the inner bearings are provided in the protrusions and the grooves, friction between the female coupling disc and the male coupling disc can be reduced.

1 is a view showing a connection structure of a generator and a turbine according to the prior art.
2 shows a power transmission device according to one embodiment of the invention.
3 shows a detailed configuration of a power transmission device according to an embodiment of the present invention.
4 shows a detailed configuration of a power transmission device according to an embodiment of the present invention.
5 shows a detailed configuration of a power transmission device according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated and described in detail in the detailed description. However, this is not intended to limit the invention to the specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the invention.

Throughout this specification, when referred to as "on" a member, this includes not only when one member is in contact with another member, but also when there is another member between the two members. Throughout this specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the common or dictionary meanings, but should be construed as meanings and concepts consistent with the technical spirit of the present invention. Note that the same components in the accompanying drawings are represented by the same reference numerals as possible. In addition, a detailed description of the function and configuration of the cape which may blur the gist of the present invention will be omitted. For the same reason, in the accompanying drawings, some components are exaggerated or schematically illustrated.

1 is a view showing a connection structure of a generator and a turbine according to the prior art. The generator G is connected to the turbine T, and the rotational energy in the turbine T is transmitted to the generator G through the shaft. The shaft that transmits rotational energy is designed to withstand high torque and is designed to not be destroyed even under abnormal conditions such as surge in the generator G. Thus, shafts are generally designed to withstand higher stresses than torque due to conventional rotational energy.

2 shows a power transmission device according to one embodiment of the invention.

The power transmission device D is connected to the turbine T and the generator G and is provided therebetween. The power transmission device D transmits the rotational energy generated from the turbine T to the generator G. The rotary shaft R of the turbine T, the power transmission device D, and the generator G may be the same.

The power transmission device D may transmit rotational energy from the turbine T to the generator G in a normal situation, and may prevent an abnormal situation such as a surge from being transmitted from one configuration to another. have. For example, the power transmission device D may not transmit rotational energy above a certain torque.

The above-mentioned abnormal situation is not limited to the surge, and includes a case where the rotational energy transmitted suddenly changes, such as a sudden stop of the turbine T or the generator G, and an overrotation of the turbine T.

3 shows a detailed configuration of a power transmission device according to an embodiment of the present invention. The power transmission device D consists of a shaft 100. The shaft 100 rotates about the rotation shaft R, and both ends 101 and 101 ′ of the shaft 100 are formed to be connected to the generator G and the turbine T.

At both ends 101 and 101`, the disk 102 is formed so that it may extend in the outer direction of the rotation axis R. As shown in FIG. The disk 102 transfers kinetic energy from the turbine T contacted through both ends 101, 101 ′ to the generator G. Alternatively, the kinetic energy may be transmitted from the generator G to the turbine T.

The rotating column 103 is provided between the disks 102 to rotate about the rotation axis R, and connects both disks 102. The rotating column 103 has a cylindrical shape and transmits kinetic energy through rotation.

A portion of the rotary column 103 is formed with a notch 104 that is curved in the direction of the rotation axis (R). The portion where the notch 104 is formed is not destroyed in normal operation of the generator G and the turbine T, but may be destroyed by a sudden torque change. Notch 104 may vary the degree of bending as needed.

For example, when the degree of curvature of the notch 104 is small, the shaft 100 can transmit energy without being destroyed by sudden changes in torque. However, when the degree of curvature of the notch 104 is large, the shaft 100 may be destroyed by a sudden change in torque, and transfer of energy may be impossible.

In FIG. 3, the rotary pillar 103 is illustrated as a single body, but a portion in which the notch 104 is formed may be separated and coupled to the rotary pillar 103.

As the notch 104 is formed as described above, specific parts of the shaft 100 may be destroyed, thereby reducing costs and time required for maintaining, repairing, and repairing the power transmission device D. FIG. In addition, other parts of the power transmission device D may not be destroyed due to a sudden torque change, thereby improving safety.

Guard 200 may be provided on the outside of the shaft (100). Guard 200 includes a shield plate 201 and the auxiliary pillar 202.

The protection plate 201 may be formed in the longitudinal direction of the shaft 100 so that the rotation pillar 103 is not exposed to the outside.

The protective plate 201 may improve the safety by preventing the rotating pillar 103 from being exposed to the outside. In addition, the protection plate 201 may prevent an accident that may occur due to debris that may be generated when the notch 104 is destroyed.

The auxiliary pillar 202 may be formed in the direction of the central axis R in the protective plate 201. One or more auxiliary pillars 202 may be formed on both sides of the notch 104.

As the auxiliary pillar 202 is formed, when the notch 104 is destroyed, the fragments can be prevented from being exposed to the outside, and the rotational shaft R of the shaft 100 can be prevented from being detached. Can be prevented.

An outer bearing 300 may be provided between the auxiliary pillar 202 and the rotary pillar 103. The outer bearing 300 may reduce the friction between the auxiliary pillar 202 and the rotating pillar 103, and may prevent the rotation shaft R of the shaft 100 from being separated when the notch 104 is destroyed. .

The guard 200 may not only improve the safety of the shaft 100, but also support the shaft 100. As the guard 200 supports the shaft 100, the deformation of the shaft 100 may be prevented.

Although the embodiment of the guard 200 is shown in FIG. 3 only, the guard 200 may be applied to the embodiments of FIGS. 4 and 5.

4 shows a detailed configuration of a power transmission device according to an embodiment of the present invention. The shaft 100 of the power transmission device D may be composed of a female coupling disk 110 and a male coupling disk 120. The above configuration will be described in detail with reference to FIG. 5.

The female coupling disk 110 is larger than the male coupling disk 120 so that a portion of the male coupling disk 120 may be inserted into the female coupling disk 110.

An outer bearing 300 may be provided between the female coupling disk 110 and the male coupling disk 120.

The female coupling disk 110 and the male coupling disk 120 may be bound by the fixture 400.

5 is an exploded view of a power transmission device according to an embodiment of the present invention.

The female coupling disk 110 may have a female disk 111 on the outside thereof. The arm disk 111 may be connected to the generator G or the turbine T to transmit energy.

The female disk 111 may have a female disk outer pillar 112 in the direction of the male coupling disk 120. The arm disk outer column 112 may rotate about the rotation axis R and transmit energy. In normal operation of the generator G and the turbine T, the arm disc outer column 112 is designed with sufficient strength to transfer energy.

The female disk outer pillar 112 may be connected to the inner female disk 113. The inner arm disk 113 is formed in a 'c' shape, the fastening hole 114 is formed may be coupled to the fixture 400.

The inner arm disk 113 is composed of an inner arm disk outer surface 115, an inner arm disk inner surface 116, and an inner arm disk bottom surface 117.

An inner arm disk inner pillar 118 is formed on the inner arm disk bottom surface 117. The female disk inner pillar 118 is a portion extending from the female disk outer pillar 112 to the inner side of the inner female disk 113.

The protrusion 119 is formed in the female disk inner pillar 118. The protrusion 119 is formed in the direction of the male coupling disk 120 in parallel to the rotation axis R, and a part of the protrusion 119 may be inserted into the groove 126 which will be described later.

The male coupling disk 120 may have a male disk 121 formed at an outer side thereof. The male disk 121 may be connected to the generator G or the turbine T to transmit energy.

The male disk 121 may have a male disk pillar 122 in a direction of the female coupling disk 110. The male disk pillar 122 may rotate about the rotation axis R and transmit energy. In normal operation of the generator G and the turbine T, the male disk pillar 122 is designed with sufficient strength to transfer energy.

The male disc pillar 122 may be connected to the inner male disc 123. The inner male disk 123 is formed of a disc and a fastening hole 114 may be formed to be coupled to the fixture 400.

The inner male disk 123 is composed of an inner male disk outer surface 125 and an inner male disk upper surface 126.

The inner male disk outer surface 125 abuts the inner female disk inner surface 116.

A groove portion 127 is formed in the inner male disk upper surface 126. The groove 127 may be formed with a groove formed in the direction of the male disc 121, and a portion of the protrusion 119 may be inserted therein.

An inner bearing 301 may be provided between the protrusion 119 and the groove 127. Accordingly, friction between the protrusion 119 and the groove 127 may be reduced, and the central axes of the female coupling disk 110 and the male coupling disk 120 may not be separated from the rotational axis R.

The fixture 400 may bind the female coupling disk 110 and the male coupling disk 120. Fixture 400 may be composed of a fixing pin 401, a fixing plate 402 and a fixing nut (403).

As the fixing pin 401 transmits energy through the fastening hole 114 formed in the inner female disk 113 and the inner male disk 123, the female coupling disk 110 and the male coupling disk 120 are provided. You can synchronize the rotation of.

A fixing plate 402 may be provided on the inner female disk bottom 117 and the inner male disk upper surface 126 to engage the fixing pin 401. The fixing plate 402 may be attached to the inner female disc bottom 117 and the inner male disc top 126 to prevent twisting and deformation of the fixing pin 401. Accordingly, the fixing pin 401 can effectively transfer energy, and durability can be increased by preventing deformation of the fixing pin 401.

The fixing nut 403 may be provided at an outer side of the fastening hole 114 of the inner female disk 113 and the inner male disk 123. The fixing nut 403 may be combined with the fixing pin 401 to maintain the position of the fixing pin 401.

The fixing pin 401 may be formed with a notch 104 curved in the direction of the central axis of the fixing pin 401. The portion where the notch 104 is formed is not destroyed in normal operation of the generator G and the turbine T, but may be destroyed by a sudden torque change. Notch 104 may vary the degree of bending as needed.

For example, when the degree of curvature of the notch 104 is small, the fixing pin 401 may transmit energy without being destroyed by a sudden change in torque. However, when the degree of curvature of the notch 104 is large, the fixing pin 401 is destroyed by a sudden change in torque, and energy transfer may be impossible.

Regarding the description of this invention through the preceding drawings, not all the embodiments are shown in the drawings for the convenience of description, it can be expected that the configuration only in one drawing is applicable to the embodiments in the other drawings.

100: shaft
101, 101`: end 102: disk
103: rotating cylinder 104: notch
110: female coupling disk 111: female disk
112: arm disk outer pillar 113: inner arm disk
114: fastening hole 115: inner arm disk outer surface
116: inner side of the inner disk disk 117: bottom surface of the inner arm disk
118: female disk inner pillar 119: protrusion
120: male coupling disk 121: male disk
122: male disk pillar 123: inner male disk
125: inner male disk outer surface 126: inner male disk upper surface
127: groove
200: protector
201: shield 202: auxiliary pillar
300: outer bearing 301: inner bearing
400: Fixture
401: fixing pin 402: fixing plate
403: retaining nut

Claims (10)

In the power transmission device (D) for transmitting the power of the turbine (T) and the generator (G),
A shaft 100 is provided, and both ends 101 and 101` of the shaft 100 are connected to the turbine T and the generator G, respectively, between the ends 101 and 101`. The power transmission device, characterized in that the notch 104 is formed in the rotary column 103 is provided.
The method of claim 1,
A guard 200 is provided outside the shaft 100, and the guard 200 includes a guard plate 201 formed in a direction parallel to the central axis R.
The method of claim 2,
Power transmission device, characterized in that one or more auxiliary pillars (202) formed in the direction of the central axis (R) in the protective plate (201).
The method of claim 3,
Power transmission device, characterized in that the outer bearing 300 is provided between the auxiliary pillar (202) and the rotating column (103).
The method of claim 3,
The notch (104) is a power transmission device, characterized in that formed between the auxiliary pillar (202).
The method of claim 1,
The shaft 100 is composed of a female coupling disk 110 and a male coupling disk 120, the female coupling disk 110 and the male coupling disk 120 is one or more fasteners 400 Power transmission device characterized in that the binding by.
The method of claim 6,
The fixture 400 includes a fixing pin (401), the notch 104 is a power transmission device, characterized in that formed on the fixing pin (401).
The method of claim 7, wherein
The fastener 400 includes a fixing plate 402, wherein the fixing plate 402 is provided on both sides based on the notch (104).
The method of claim 6,
A female disk inner pillar 118 is formed on the female coupling disk 110, a protrusion 119 is formed on the female disk inner pillar 118, and an inner male disk (red) is formed on the male coupling disk 120. 123 is formed, the inner male disk 123 is formed with an inner male disk upper surface 126, the inner male disk upper surface 126 is formed with a groove portion 127, the protrusion 119 is the groove portion A power transmission device characterized by being drawn in (127).
The method of claim 9,
Power transmission device, characterized in that the inner bearing (301) is provided between the protrusion (119) and the groove (127).

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