Vibration reduction device and nuclear power plant cabinet using the same

Abstract

To provide a vibration reduction device with high vibration reduction efficiency, and a nuclear power plant cabinet using the same.SOLUTION: Provided is a vibration reduction device installed in a nuclear power plant cabinet in which electronic devices are provided, where the vibration reduction device reduces vibrations of the nuclear power plant cabinet. The vibration reduction device includes: a casing body formed on one side of the nuclear power plant cabinet and having an accommodation space formed therein; a plurality of springs which are housed within the casing body and one end of each of which is coupled to the casing body; and a mass body fastened to the other end of each of the springs. Also provided is a nuclear power plant cabinet employing the vibration reduction device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration reduction device and a cabinet for a nuclear power plant using the same, and more particularly to a vibration reduction device that is attached to structures such as general buildings, power plants, or plants to reduce the transmission of vibrations caused by earthquakes to the building or structure, and a cabinet for a nuclear power plant using the same. [Background technology]

[0002] When an earthquake occurs, vibrations are transmitted to structures such as buildings and facilities in either the vertical or horizontal direction, but horizontal vibrations cause the structures to violently shake and twist. If the magnitude of the transmitted vibrations is large, it can partially damage the structure, reducing its stability and, in severe cases, causing the structure to collapse.

[0003] In particular, large structures such as power plants and other industrial plants are subject to more severe damage from earthquakes. For this reason, various measures have been proposed to reduce the vibrations that occur in large structures.

[0004] Conventional methods for reducing vibration include improving the dynamic characteristics of structures, vibration isolation, and installing vibration reduction devices on structures. In particular, installing vibration reduction devices on structures is the most widely used method due to its durability and cost-effectiveness.

[0005] Friction dampers have been used as such vibration reduction devices. Conventional friction dampers reduce vibration caused by friction by inserting friction pads between the contact surfaces of multiple vertical members. However, such friction dampers only utilize the friction force between the surfaces of the vertical members, and therefore have the problem of not being very efficient at reducing vibration. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent No. 10-0952086 (registered on April 2, 2010) Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made to solve the above problems, and aims to provide a vibration reduction device that can reduce the transmission of vibrations caused by earthquakes, etc. to a nuclear power plant cabinet by using a mass body fastened to a plurality of springs provided in an accommodation space of a case body formed on one side of the nuclear power plant cabinet, which is a structure, and that can vary the weight of the mass body in response to frequency changes of electronic devices placed in the nuclear power plant cabinet, and a nuclear power plant cabinet using the same. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a vibration reduction device that is installed in a cabinet for a nuclear power plant that has electronic devices installed therein and reduces vibrations of the cabinet for the nuclear power plant, the vibration reduction device including: a case body formed on one side of the cabinet for the nuclear power plant and having an accommodation space formed therein; a plurality of springs accommodated inside the case body and having one ends connected to the case body; and a mass body fastened to the other ends of the springs.

[0009] The vibration reduction device according to the present invention may further include an interface plate disposed between the case body and the nuclear power plant cabinet and fastened to the nuclear power plant cabinet by a first fastening means, and a second fastening means connecting the interface plate to the case body.

[0010] In the vibration reduction device according to the present invention, the case body may be fastened to a central portion of the interface plate, and a weight reduction hole may be formed in the interface plate adjacent to the central portion.

[0011] A nut member that is fastened to the case body by a bolt fastening means may be attached to one end of the spring, and a bolt member that is fastened to the mass body may be attached to the other end of the spring.

[0012] The nut member may include a nut body and a protruding rod that protrudes from one side of the nut body and is inserted into one end of the spring. The nut body may have a fastening groove formed therein to fasten the bolt fastening means. A detachment prevention protrusion that protrudes outward from the circumferential surface of the protruding rod prevents the protruding rod from detaching from the one end of the spring.

[0013] The bolt member may include a bolt body, an insertion rod protruding from one side of the bolt body and inserted into the other end of the spring, and an attachment rod protruding from the other side of the bolt body and attached to the mass body, and a circumferential surface of the insertion rod may be provided with a protruding anti-detachment step that prevents the insertion rod from detaching from the other end of the spring, and a thread may be formed on the circumferential surface of the attachment rod.

[0014] The mass may include a first mass including a first mass body having a through hole formed therethrough for the spring, and a second mass including a second mass body coupled to the spring passing through the first mass and having a different weight from the first mass.

[0015] The first mass and the second mass may have different lengths, a first fastening end may be provided on one surface of the first mass that is in close contact with the second mass, a second fastening end may be provided on one surface of the second mass that is in close contact with the first mass, and a first fastening hole and a second fastening hole through which a bolt passes may be formed in the first fastening end and the second fastening end, respectively.

[0016] The present invention also provides a cabinet for a nuclear power plant, including a cabinet body in which electronic devices are installed, and a vibration reduction device attached to one side of the cabinet body to reduce vibrations transmitted to the cabinet body.

[0017] In the cabinet for a nuclear power plant according to the present invention, the vibration reduction device may include a case body having an accommodation space formed therein and attached to one side of the cabinet body, a plurality of springs accommodated inside the case body and having one ends connected to the case body, and a mass body fastened to the other ends of the springs.

[0018] The vibration reduction device may further include an interface plate disposed between the case body and the cabinet body and fastened to the cabinet body by a first fastening means, and a second fastening means connecting the interface plate to the case body.

[0019] The case body may be fastened to a central portion of the interface plate, and a weight reduction hole may be formed in the interface plate adjacent to the central portion.

[0020] A nut member that is fastened to the case body by a bolt fastening means may be attached to one end of the spring, and a bolt member that is fastened to the mass body may be attached to the other end of the spring.

[0021] The nut member may include a nut body and a protruding rod that protrudes from one side of the nut body and is inserted into one end of the spring. The nut body may have a fastening groove formed therein to fasten the bolt fastening means. A detachment prevention protrusion that protrudes outward from the circumferential surface of the protruding rod prevents the protruding rod from detaching from the one end of the spring.

[0022] The bolt member may include a bolt body, an insertion rod protruding from one side of the bolt body and inserted into the other end of the spring, and an attachment rod protruding from the other side of the bolt body and attached to the mass body, and a circumferential surface of the insertion rod may be provided with a protruding anti-detachment step that prevents the insertion rod from detaching from the other end of the spring, and a thread may be formed on the circumferential surface of the attachment rod.

[0023] The mass may include a first mass including a first mass body having a through hole formed therethrough for the spring, and a second mass including a second mass body coupled to the spring passing through the first mass and having a different weight from the first mass.

[0024] The first mass and the second mass may have different lengths, a first fastening end may be provided on one surface of the first mass that is in close contact with the second mass, a second fastening end may be provided on one surface of the second mass that is in close contact with the first mass, and a first fastening hole and a second fastening hole through which a bolt passes may be formed in the first fastening end and the second fastening end, respectively. [Effects of the Invention]

[0025] The vibration reduction device and the cabinet for a nuclear power plant using the same according to the present invention can accommodate a variety of displacements by changing the number of springs to which one end is attached and the weight of the mass body attached to the spring after being housed in the case body, and by providing the mass body on only one side of the spring, a larger displacement can be ensured.

[0026] Furthermore, by making the weight of the mass body variable, it is possible to smoothly respond to frequency changes in the electronic devices placed in the nuclear power plant cabinet in which the vibration reduction device is installed, while reducing the vibration transmitted to the nuclear power plant cabinet. [Brief explanation of the drawings]

[0027] [Figure 1]1 is a diagram schematically illustrating a vibration reduction device according to an embodiment of the present invention. [Figure 2] 2 is a diagram showing a state in which the vibration reduction device of FIG. 1 is fastened to an interface plate attached to a cabinet for a nuclear power plant. FIG. [Figure 3] 3 is a diagram showing a state in which a plurality of springs, each having a mass body fastened thereto, are fastened to the case body shown in FIG. 2.

[0023] FIG. [Figure 4] FIG. 2 is a cross-sectional view showing the inside of FIG. [Figure 5] 5 is a diagram showing a state in which the first mass and the second mass shown in FIG. 4 are fastened together and a state in which a spring is fastened to the masses. [Figure 6] 5A and 5B show another embodiment of the mass shown in FIG. 4. [Figure 7] 5A and 5B show yet another embodiment of the mass body shown in FIG. 4. [Figure 8] FIG. 10 is an exploded perspective view of a cabinet for a nuclear power plant according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and phrases used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as having meanings and concepts that correspond to the technical ideas of the present invention, in accordance with the principle that the inventor can appropriately define the concepts of terms in order to best describe his / her invention.

[0029] 6, an electronic device E that controls various facilities in a nuclear power plant is provided inside a cabinet 10 for a nuclear power plant according to an embodiment of the present invention, and an earthquake-resistant design is applied to the cabinet 10 for a nuclear power plant to reduce vibrations caused by earthquakes, etc. The cabinet 10 for a nuclear power plant includes a cabinet body 11 in which the electronic device E is housed, and a vibration reduction device 100, and the vibration reduction device 100 is attached to one side of the cabinet body 11 to reduce vibrations transmitted to the cabinet body 11.

[0030] Referring to Figures 1 and 8, a friction damper (not shown) is applied to the lower part of the cabinet body 11 to reduce vertical vibrations transmitted to the cabinet body 11, and it is preferable that a support frame 12 is provided to support the cabinet body 11 from below.

[0031] Referring to Figures 2 and 8, a vibration reduction device 100 is provided on one side of the cabinet body 11 supported by the support frame 12, and the vibration reduction device 100 serves to reduce vibration of the cabinet body 11 in which the electronic device E is installed. The vibration reduction device 100 includes a case body 1100, a plurality of springs 1200, and a mass body 1300, and may further include an interface plate 1400.

[0032] 1 to 3 and 8, the case body 1100 is formed on one side of the cabinet body 11 of the nuclear power plant cabinet 10, and an accommodating space 1100a is formed inside the case body 1100 to accommodate the plurality of springs 1200 and the mass body 1300, and the accommodating space 1100a formed inside the case body 1100 is sealed by a cover C.

[0033] The plurality of springs 1200 housed inside the case body 1100 have one end connected to the case body 1100, and it is preferable that the number of the springs 1200 connected to the case body 1100 is adjusted according to the displacement acting on the cabinet body 11.

[0034] 2 to 5, one end of the spring 1200 is connected to the case body 1100, and the mass body 1300 is attached to the other end of the spring 1200 whose one end is connected to the case body 1100.

[0035] A nut member 1210 is attached to one end of the spring 1200 connected to the case body 1100, and a bolt member 1220 is attached to the other end of the spring 1200 to which the mass body 1300 is attached.

[0036] A through hole 1100b through which a bolt fastening means BF passes is formed on one surface of the case body 1100 to which one end of the spring 1200 is connected, and it is preferable that the through holes 1100b are formed on one surface of the case body 1100 in a number corresponding to the number of the springs 1200 accommodated in the accommodation space 1100a.

[0037] 3 and 5, the nut member 1210 attached to one end of the spring 1200 includes a nut body 1211 and a protruding rod 1212 protruding from one side of the nut body 1211, and the nut body 1211 preferably has a cylindrical shape. Although the nut body 1211 has been described as having a cylindrical shape, it is not limited thereto and may have a rectangular shape. One side of the nut body 1211 is formed with a fastening groove 1211a to which one end of the bolt fastening means BF passing through the through hole 1100b is fastened, and it is preferable that a thread groove (not shown) is formed on the inner peripheral surface of the fastening groove 1211a.

[0038] The protruding rod 1212 is formed on one side of the nut body 1211 so as to protrude outward, and the protruding rod 1212 is inserted into the inside of one end of the spring 1200. It is preferable that the protruding rod 1212 has a detachment prevention protrusion 1212a protruding outward from the circumferential surface to prevent the protruding rod 1212 from detaching from the one end of the spring 1200.

[0039] When the protruding rod 1212 having the anti-detachment protrusion 1212a formed thereon is inserted into one end of the spring 1200 while rotating, the one end of the spring 1200 is supported by the protruding rod 1212, and when the protruding rod 1212 rotates in the opposite direction to the insertion direction due to the anti-detachment protrusion 1212a and does not come off from the one end of the spring 1200, the protruding rod 1212 fixes and supports the one end of the spring 1200 without coming off from the one end of the spring 1200.

[0040] The bolt member 1220 attached to the other end of the spring 1200 includes a bolt body 1221, an insertion rod 1222 protruding from one side of the bolt body 1221 and inserted into the inside of the other end of the spring 1200, and an attachment rod 1223 protruding from the other side of the bolt body 1221 and attached to the mass body 1300.

[0041] It is preferable that a detachment prevention step 1222a protrudes outward from the peripheral surface of the insertion rod 1222 to prevent the spring 1200 from detaching from the other end thereof, and it is preferable that the mounting rod 1223 has a thread 1223a formed thereon to be screwed to the mass body 1300.

[0042] The mass body 1300, which is fastened to the other end of the spring 1200 to which the bolt member 1220 is attached, can vary its weight in response to changes in frequency of the electronic device E provided in the cabinet body 11, and the mass body 1300 includes a first mass body 1310 and a second mass body 1320.

[0043] The first mass body 1310 includes a plurality of first mass bodies having different weights, and a through hole 1310a is formed in the first mass body, through which the other end of the spring 1200, to which the bolt member 1220 is attached, passes. Since the plurality of first mass bodies included in the first mass body 1310 have different weights, the weight of the first mass body 1310 can be changed in response to a change in frequency of the electronic device E installed in the cabinet body 11.

[0044] The second mass 1320 includes a plurality of second mass bodies having different weights, and the second mass bodies are fastened to the bolt member 1220 attached to the other end of the spring 1200 that passes through the first mass body of the first mass 1310. The second mass 1320 has a weight different from that of the first mass 1310, and a fastening hole 1320a is formed in the second mass 1320 to fasten the bolt member 1220, and it is preferable that a thread groove (not shown) is formed on the circumferential surface of the fastening hole 1320a.

[0045] Since the first mass 1310 and the second mass 1320 have different weights, the first mass 1310 and the second mass 1320 preferably have different lengths.

[0046] 5 and 8, it is preferable to vary the weight of the mass 1300 in response to the expected natural frequency that is expected to be transmitted to the cabinet body 11 when vibrations due to an earthquake or the like occur. The first mass 1310 and the second mass 1320 have different weights, and by combining and coupling the first mass 1310 and the second mass 1320 having different weights, it is possible to accommodate a wide range of expected natural frequencies.

[0047] If the expected natural frequency transmitted to the cabinet body 11 is low, the weight of the mass body 1300 is high, and the higher the expected natural frequency is, the lower the weight of the mass body 1300 is.

[0048] If the expected natural frequency transmitted to the cabinet body 11 is 11 Hz, the mass 1300 preferably has a weight of 23 kg, and if the expected natural frequency is 13 Hz, the mass 1300 preferably has a weight of 16.5 kg.

[0049] Referring to FIG. 4, the first mass 1310 of the mass 1300 housed inside the case body 1100 and attached to the other end of the spring 1200 is shown to be longer and heavier than the second mass 1320, but this is not limited thereto. As shown in FIG. 8, the length of the second mass 1320 may be longer than the length of the first mass 1310, and the weight of the second mass 1320 may be greater than the weight of the first mass 1310.

[0050] 7, the mass 1300 is not limited to including the first mass 1310 and the second mass 1320, and may further include a third mass 1330. The third mass 1330 is disposed between the first mass 1310 and the second mass 1320, and preferably has a different weight and length from the first mass 1310 and the second mass 1320. The third mass 1330 preferably has a through-hole (not shown) through which the other end of the spring 1200 passes, and the spring 1200, which passes through the through-hole of the third mass 1330 and then through the third mass 1330, is fastened to the second mass 1320.

[0051] Referring to FIG. 5, a first fastening end 1311 is provided on one surface of the first mass 1310 that is in close contact with the second mass 1320, a second fastening end 1321 is provided on one surface of the second mass 1320 that is in close contact with the first mass 1310, and a first fastening hole 1311a and a second fastening hole 1321a are formed in the first fastening end 1311 and the second fastening end 1321, respectively, through which a bolt B passes.

[0052] A nut N is fastened to the bolt B passing through the first fastening hole 1311a and the second fastening hole 1321a, so that the first mass 1310 and the second mass 1320 are connected and fixed by the bolt B and the nut N.

[0053] Referring to Figures 2 and 8, an interface plate 1400 is disposed between the case body 1100 and the cabinet body 11, and the interface plate 1400 is fastened and fixed to the cabinet body 11 by a first fastening means F1, and it is preferable to use a bolt as the first fastening means F1.

[0054] The case body 1100 is coupled to the interface plate 1400 fastened to the cabinet body 11, and the case body 1100 is fastened and fixed to the interface plate 1400 by second fastening means F2, and the second fastening means F2 uses the same bolt as the first fastening means F1.

[0055] The outer peripheral surface of the interface plate 1400 is formed with a plurality of fastening holes 1400a through which the first fastening means F1 penetrates, and the case body 1100 is formed with a plurality of fastening holes 1100c through which the second fastening means F2 penetrates, and it is preferable that the plurality of fastening holes 1100c are formed on the protruding end 1110 that protrudes outward from the case body 1100.

[0056] The case body 1100 is disposed at a central portion of the interface plate 1400 and is fastened to the interface plate 1400 by the second fastening means F2. Weight reduction holes 1410 for reducing the weight of the interface plate 1400 are formed in the interface plate 1400 adjacent to the central portion where the case body 1100 is fastened. The weight reduction holes 1410 are formed corresponding to one side and the other side of the interface plate 1400 based on the case body 1100 fastened to the central portion, and the interface plate 1400 is preferably made of aluminum material that can reduce its weight.

[0057] After being accommodated in the case body 1100, the number of springs 1200, one end of which is attached to the case body 1100, and the weight of the mass body 1300 attached to the springs 1200 can be changed to accommodate various displacements, and by providing the mass body 1300 only on one side of the spring 1200, a larger displacement can be ensured.

[0058] Furthermore, by making the weight of the mass body 1300 variable, it is possible to smoothly respond to frequency changes of the electronic device E placed in the nuclear power plant cabinet 10 in which the vibration reduction device 100 is installed, while reducing the vibration transmitted to the nuclear power plant cabinet 10.

[0059] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely examples, and those skilled in the art will recognize that various modifications and equivalent embodiments are possible. Therefore, the true technical scope of protection of the present invention is defined by the technical ideas of the appended claims. [Explanation of symbols]

[0060] 10: Nuclear power plant cabinet, 11: Cabinet body 100: Vibration reduction device, 1100: Case body 1200: Spring, 1210: Nut material 1220: Bolt member, 1300: Mass body 1310: First mass body, 1320: Second mass body 1400: Interface plate

Claims

1. 1. A vibration reduction device that is provided in a cabinet for a nuclear power plant that has electronic equipment installed therein and reduces vibration of the cabinet for the nuclear power plant, a case body formed on one side of the cabinet for nuclear power plants and having an accommodation space therein; a plurality of springs housed inside the case body and having one end connected to the case body; a mass body fastened to the other end of the spring.

2. an interface plate disposed between the case body and the nuclear power plant cabinet and fastened to the nuclear power plant cabinet by a first fastening means; The vibration reduction device according to claim 1 , further comprising a second fastening means for connecting the interface plate and the case body.

3. The case body is fastened to a central portion of the interface plate, The vibration reduction device of claim 2 , wherein a weight reduction hole is formed in the interface plate adjacent the central portion.

4. 4. The vibration reduction device according to claim 3, wherein one end of the spring is attached to a nut member that is fastened to the case body by a bolt fastening means, and the other end of the spring is attached to a bolt member that is fastened to the mass body.

5. The nut member is Nut body and a protruding rod protruding from one side surface of the nut body and inserted into one end of the spring, The vibration reduction device according to claim 4 , wherein the nut body is formed with a fastening groove into which the bolt fastening means is fastened.

6. The vibration reduction device according to claim 5, wherein a detachment prevention protrusion is provided on the peripheral surface of the protruding rod so as to protrude outward to prevent the protruding rod from being detached from the one end of the spring.

7. The bolt member is The bolt body and an insertion rod protruding from one side surface of the bolt body and inserted into the other end of the spring; an attachment rod that protrudes from the other side surface of the bolt body and is attached to the mass body, A vibration reduction device as described in any one of claims 4 to 6, wherein a protruding anti-detachment step is provided on the peripheral surface of the insertion rod to prevent the insertion rod from detaching from the other end of the spring, and a screw thread is formed on the peripheral surface of the mounting rod.

8. The mass is a first mass body including a first mass body having a through hole formed therethrough for the spring; The vibration reduction device of claim 4 , further comprising: a second mass body coupled to the spring passing through the first mass, the second mass body having a different weight than the first mass.

9. The vibration reduction device according to claim 8 , wherein the first mass and the second mass have different lengths.

10. a first fastening end is provided on one surface of the first mass that is in close contact with the second mass, and a second fastening end is provided on one surface of the second mass that is in close contact with the first mass; The vibration reduction device according to claim 8 or 9, wherein the first fastening end and the second fastening end are respectively formed with a first fastening hole and a second fastening hole through which a bolt passes.

11. A cabinet body with electronic devices inside, a vibration reduction device attached to one side of the cabinet body to reduce vibrations transmitted to the cabinet body.

12. The vibration reduction device is a case body having an accommodation space formed therein and attached to one side of the cabinet body; a plurality of springs housed inside the case body and having one end connected to the case body; 12. The nuclear power plant cabinet according to claim 11, further comprising a mass fastened to the other end of the spring.

13. The vibration reduction device is an interface plate disposed between the case body and the cabinet body and fastened to the cabinet body by a first fastening means; 13. The nuclear power plant cabinet of claim 12, further comprising second fastening means connecting said interface plate and said case body.

14. The case body is fastened to a central portion of the interface plate, 14. The cabinet for a nuclear power plant according to claim 13, wherein a weight reduction hole is formed in the interface plate adjacent the central portion.

15. 15. The cabinet for a nuclear power plant according to claim 14, wherein a nut member fastened to the case body by a bolt fastening means is attached to one end of the spring, and a bolt member fastened to the mass body is attached to the other end of the spring.

16. The nut member is Nut body and a protruding rod protruding from one side surface of the nut body and inserted into one end of the spring, The nut body is formed with a fastening groove into which the bolt fastening means is fastened, The cabinet for a nuclear power plant according to claim 15, wherein a detachment prevention protrusion is provided on a peripheral surface of the protruding rod so as to protrude outward to prevent the protruding rod from detaching from the one end of the spring.

17. The bolt member is The bolt body and an insertion rod protruding from one side surface of the bolt body and inserted into the other end of the spring; an attachment rod that protrudes from the other side surface of the bolt body and is attached to the mass body, 17. The cabinet for a nuclear power plant according to claim 15 or 16, wherein a detachment prevention step protrudes from a peripheral surface of the insertion rod to prevent the insertion rod from detaching from the other end of the spring, and a screw thread is formed on a peripheral surface of the attachment rod.

18. The mass is a first mass body including a first mass body having a through hole formed therethrough for the spring; 16. The cabinet for a nuclear power plant according to claim 15, further comprising: a second mass coupled with the spring passing through the first mass, the second mass having a different weight than the first mass.

19. 20. The nuclear power plant cabinet of claim 18, wherein the first mass and the second mass have different lengths.

20. a first fastening end is provided on one surface of the first mass that is in close contact with the second mass, and a second fastening end is provided on one surface of the second mass that is in close contact with the first mass; 20. The cabinet for a nuclear power plant according to claim 18 or 19, wherein the first fastening end and the second fastening end are respectively formed with a first fastening hole and a second fastening hole through which a bolt passes.

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