JP2011222816A - Stationary induction electric appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction electric appliance which has a high vibration insulating performance and a noise reduction performance by reduced man-hours.SOLUTION: A stationary induction electric appliance includes: tank reinforcing members 4 which form protruding ridges laterally arranged in a manner where each ridge is oriented in the vertical direction by being fixed on external side surfaces 3 of a tank housing a stationary induction electric appliance body 1; tank reinforcing ribs 7 joining the tank reinforcing members 4 to each other; and sound insulating panels 5 welded to cover spaces formed by the tank reinforcing members 4 and the tank reinforcing ribs 7. The sound insulating panel 5 includes: two or more sound insulating plates 5a and 5b opposed to each other; and frame-like reinforcing ribs 5c which are arranged so as to form a closed space 9 between the sound insulating plates and whose adjacent sides are attached to each other in a manner tilted from the right angle such that the opposite sides are not parallel.

Description

  The present invention relates to a static induction appliance, and more particularly to a static induction appliance having vibration isolation performance and noise reduction performance.

  In recent years, noise regulations have become stricter from the viewpoint of environmental protection, and it is strongly desired to reduce the noise of static induction appliances such as transformers. The noise of the static induction machine is generated because the vibration of the main body of the static induction machine propagates to the tank and the side surface of the tank vibrates to emit sound to the surroundings.

  As a means for preventing such diffusion of radiated sound, a method in which a static induction appliance is housed in a soundproof building made of iron plate or the like can be considered. In such a method, there is a problem that the installation area increases, and therefore, a measure of directly installing a sound insulation board around the tank is widely implemented. This sound insulation board reduces the sound radiated from the side surface of the tank by a reduction effect when sound passes through the sound insulation board, that is, transmission loss. In this soundproofing measure, consideration is given to the structure so that the sound insulation plate itself vibrates due to vibrations on the side surface of the tank and no noise is generated (for example, see Patent Document 1).

Hereinafter, the soundproofing measures described in Patent Document 1 will be specifically described with reference to FIGS.
As shown in FIG. 16, the stationary induction main body 1 is accommodated in the tank 2. The tank 2, four upper reinforcing beams of the upper and respectively cross-sectional U-shaped in a horizontal direction in the lower portion of the side surface 16 ₁ and a lower reinforcement beam 16 ₂ are joined by welding.

Attaching an upper support point 17 on the upper end surface of the upper reinforcement beam 16 _1, while attaching the lower support point 18 to the tank outer surface 3 part which is located below the lower reinforcement beam 16 _2, these upper support point 17 and the lower support Between the points 18, a sound insulating plate 5 a is attached so as to cover the tank outer surface 3. The sound insulating plate 5a is constituted by a sound insulating plate main body (sound insulating panel) 22, elastic elements 23 and 24, and sealing materials 25 and 26.

  As shown in FIG. 17, the sound insulating plate main body 22 itself is composed of one rectangular flat plate 19, a frame-shaped reinforcing rib 20 attached to the periphery of the flat plate 19, and a cross-shaped reinforcing rib 21. The flat plate 19, the reinforcing rib 20, and the reinforcing rib 21 are joined by welding.

  The elastic element 23 is disposed between the sound insulation plate main body 22 and the upper support point 17, and the elastic element 24 is disposed between the sound insulation plate main body 22 and the lower support point 18. The sealing materials 25 and 26 have flexibility, and seal the gap generated between the sound insulating plate main body 22 and the tank outer surface 3 by arranging the elastic elements 23 and 24.

  In the prior art in which the above soundproofing measures are taken, the sound insulating plate 5a has the effect of attenuating the sound radiated from the tank outer surface 3 by transmission loss. At the same time, the reinforcement ribs 20 and 21 increase the bending rigidity of the sound insulation board body 22 to reduce the generation of noise from the sound insulation board 5a itself, thereby preventing bending vibration of the sound insulation board body 22 and elastic elements 23 and 24. And the vibration system composed of the sound insulation board main body 22 are brought close to an ideal one degree of freedom system. Therefore, the vibration insulation effect by the elastic elements 23 and 24 is improved, and the vibration of the sound insulation board main body 22 is suppressed, so that the noise radiated from the sound insulation board main body 22 can be reduced.

  Further, since the elastic elements 23 and 24 are provided, a gap is generated between the sound insulating plate main body 22 and the tank outer surface 3. However, the flexible sealing materials 25 and 26 prevent the sound radiated from the tank outer surface 3 from leaking outside through the gap from the space inside the sound insulating plate 5a.

  In addition, it is also possible to make the sound-insulating board main body 22 with a damping steel plate, and to heighten the damping effect of a sound-insulating plate. It is well known that the damping steel plate is integrally formed by sandwiching a polymer viscoelastic material between a plurality of steel plates, and has a high damping capacity against vibration.

  In addition, as shown in FIG. 18, a structure in which three sound insulating plates 5a are attached to the tank outer surface 3 has been proposed. By using a plurality of divided sound insulating plates 5a in this way, one sound insulating plate 5a can be made small, and manufacturing and transportation can be facilitated.

  Furthermore, as shown in FIG. 19, there has also been proposed a structure in which a sound absorbing material 14 made of glass wool or the like is attached to the inner wall of the sound insulation board main body 22. By using the sound absorbing material 14 in this way, sound reflection can be reduced, and the noise level in the space inside the sound insulating plate 5a can be reduced. The noise leaking through the sealing materials 25 and 26 is further reduced.

JP-A-10-149920

However, the static induction appliance using a sound insulating plate as a soundproofing measure as described above has the following problems.
That is, in the prior art shown in FIG. 16, the reinforcing ribs 20 and 21 constitute a vibration isolating support by the sound insulating plate body 22 with increased bending rigidity and the elastic elements 23 and 24, and vibration isolation from the tank outer surface 3 is achieved. It is carried out. This is equivalent to a vibration system that elastically supports a continuum. However, as in the case of a general one-degree-of-freedom system, the lower the natural frequency calculated from the mass and spring constant, the better the vibration insulation performance against the input. It has the nature of Therefore, in order to advance the vibration suppression, it is desirable to make the elastic supports 23 and 24 flexible and to set the natural frequency of the sound insulating plate 5a low.

  However, at the same time, the natural frequency of the sound insulating plate 5a is brought close to the dominant frequency region of the earthquake, and by setting the natural frequency low, the response of the sound insulating plate main body 22 to the earthquake input increases, which is excessive. May cause vibration. Thus, if vibration suppression is advanced, the seismic performance of the sound insulation board 5a will fall.

  In the prior art shown in FIG. 18, when the number of sound insulating plates 5a is increased, components such as the upper support point 17, the lower support point 18, the elastic elements 23 and 24, and the sealing materials 25 and 26 provided on the tank outer surface 3 are provided. Will also increase. And when a flange, piping, etc. are arrange | positioned at the tank outer surface 3, it may be impossible to arrange | position the upper support point 17 and the lower support point 18 in an optimal position, or the member of a complicated shape may be needed.

  Further, when the positions of the sound insulation board main body 22, the upper support point 17, and the lower support point 18 are shifted from each other due to assembly errors, both the positions and intervals of the gaps differ for each sound insulation board 5a. It is not easy to attach the sealing materials 25 and 26 to the gap. As described above, when the number of the sound insulating plates 5a is increased, the number of manufacturing steps increases.

In prior art as described above, the upper support point 17 to the upper reinforcement beam 16 ₁ and the surface of the tank outer surface 3, mounted across the lower support point 18 to the tank full length, the elastic elements 23, 24 on their support point surface Since the sound insulation board main body 22 is attached via this, there are disadvantages that the number of parts is large and the number of attachment steps is increased.

  That is, it is difficult to freely specify the mounting range of the sound insulating plate 5a according to the noise specifications. Further, since the sound insulation plate main body 22 is attached via the elastic elements 23 and 24, it is difficult to attach the heavy load support member to the surface of the sound insulation plate main body 22, and the structure of the support member for attaching these heavy load support members becomes complicated. . Furthermore, when structures such as pockets, oil piping, manholes, etc. must be installed near the sound insulation plate mounting position, there is a problem that the equipment body cannot be made compact, such as not being able to provide a notch in the sound insulation plate 5a. .

  Accordingly, the present invention has been proposed to solve the above-mentioned problems of the prior art, and the object of the present invention is to provide a static induction with high vibration insulation performance and noise reduction performance with a small number of manufacturing steps. To provide electrical appliances.

  In order to achieve the above object, the invention of a static induction electric appliance according to claim 1 includes a tank for housing a static induction electric appliance body, and a plurality of the induction induction electric body in a vertical direction or a lateral direction on the outer side surface of the tank. A tank reinforcing member fixed so as to form a ridge of the book, a tank reinforcing rib for joining the tank reinforcing members, and a space formed by covering the space formed by the tank reinforcing member and the tank reinforcing rib. A sound insulation panel attached to the sound insulation panel, wherein the sound insulation panels are arranged so as to form a closed space between the two or more sound insulation plates facing each other and the sound insulation plates. And a frame-shaped reinforcing rib that is attached with an angle between the sides to be inclined by 4 degrees or more so that the opposite sides are not parallel to each other.

  According to the present invention, a plurality of tank reinforcing members facing in the vertical direction are juxtaposed in the horizontal direction with respect to the outer surface of the tank, or a plurality of tank reinforcing members facing in the horizontal direction are juxtaposed in the vertical direction. Since the sound insulation panel is attached to the opening of the concave space by direct welding, a sufficient vibration reduction effect can be obtained, and the foundation for the sound insulation panel is not required, making installation easy, reducing the man-hours and costs of production. Can be reduced.

  In addition, the sound insulation panel can freely change the mounting range according to the vibration and noise specifications, and an optimal structure and a low-cost stationary induction device according to the noise specifications can be obtained.

The perspective side view which shows Embodiment 1 of the static induction machine which concerns on this invention. The front view which looked at FIG. 1 in the arrow II direction. The top view which looked at FIG. 2 in the arrow III direction. 1 is a front view of a sound insulation panel employed in Embodiment 1. FIG. FIG. 5 is a transparent side view of the sound insulation panel shown in FIG. 4. The see-through | perspective side view of the sound insulation panel of Embodiment 2 of the static induction machine which concerns on this invention. The see-through | perspective side view of the sound insulation panel of Embodiment 3 of the static induction machine which concerns on this invention. The see-through | perspective side view of the sound-insulation panel of Embodiment 4 of the static induction machine which concerns on this invention. The see-through | perspective side view of the sound insulation panel of Embodiment 5 of the static induction machine which concerns on this invention. FIG. 10 is a plan view of a static induction electric device according to a fifth embodiment. FIG. 10 is a side view of a static induction electric device according to a fifth embodiment. The front view of the sound insulation panel employ | adopted in Embodiment 6 of the static induction machine which concerns on this invention. FIG. 13 is a transparent side view of the sound insulation panel shown in FIG. 12. The see-through | perspective side view of the sound-insulation panel employ | adopted in Embodiment 7 of the static induction machine which concerns on this invention. The perspective side view of the sound insulation panel employ | adopted in Embodiment 8 of the static induction machine which concerns on this invention. The side view which shows an example of the conventional static induction machine. The front view which shows an example of the sound-insulation board main body used for FIG. The front view which shows another example of the conventional static induction machine. The perspective side view which shows another example of the conventional static induction machine.

Hereinafter, embodiments of a static induction apparatus according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected to the same part through each figure, and the overlapping description is abbreviate | omitted suitably.

[Embodiment 1]
Hereinafter, the static induction device according to the first embodiment will be described with reference to FIGS. 1 to 5.
1 is a perspective side view of a static induction electric device according to this embodiment, FIG. 2 is a front view in the direction of arrow II in FIG. 1, FIG. 3 is a plan view in the direction of arrow III in FIG. It is the front view and side view of the sound insulation panel to employ | adopt.

(Constitution)
1 and 2, a static induction electric appliance according to Embodiment 1 includes a tank 2 formed of a stationary induction electric appliance main body 1 composed of an iron core and a winding in a horizontally long rectangular parallelepiped together with an insulating medium such as insulating oil or insulating gas. It is sealed on the inside and installed on the foundation 6.

As shown in FIGS. 2 and 3, a plurality of ridges are formed on a wide pair of tank outer surfaces 3 of the four outer surfaces 3 (hereinafter referred to as tank outer surfaces 3) of the tank 2. A plurality of (4 ₁ , 4 ₂ , 4 ₃ and 4 ₄ ) side-by-side juxtaposed tank reinforcing members 4 having a square or U-shaped cross section so that they are formed in the vertical direction, The tank reinforcing members 4 ₁ , 4 ₂ , 4 ₃ and 4 ₄ are fixed to the tank outer surface 3 by welding. As a result, the tank outer surface ₃ is alternately formed with ridges by the tank reinforcing members 4 ₁ , 4 ₂ , 4 ₃ and 4 ₄ and concave space portions 8 ₁ , 8 ₂ and 8 ₃ in the lateral direction. It becomes like this.

Further, two plates substantially parallel to the base 6 so that the tank reinforcing members 4 ₁ , 4 ₂ , 4 ₃ and 4 ₄ are joined to each other and the concave space portion 8 ₁ is divided into three in the vertical direction. Install the Jo tank reinforcing ribs _{7 11} and _{7 12} by welding or the like, similarly to the mounting in the concave space portion ₈₂ to the welding two tanks reinforcing ribs _{7 21} and _{7 22,} the concave space portion _{8 3} attaching the two tanks reinforcing ribs _{7 31} and _{7 32} by welding or the like.

In this case, the welded portions are portions where the three sides of the tank reinforcing rib 7 are in contact with each other in the concave space portion 8, that is, both side surfaces of the tank reinforcing member 4 and the tank outer surface 3 surrounded by the side surfaces. 2 shows a state in which two tank reinforcing ribs 7 are attached per concave space 8, but the number of tank reinforcing ribs 7 is not limited to two, but three or more (7 ₃ ... 7 _n ) is also acceptable.

In this way, the tanks are formed in the vertical concave spaces 8 ₁ , 8 ₂ , 8 ₃ formed between the tank reinforcing members 4 ₁ , 4 ₂ , 4 ₃ and 4 ₄ forming the “longitudinal ridges”. After the reinforcing rib 7 is attached, the opening of the concave space 8 is covered with a sound insulating panel 5 having an appropriate thickness, and the periphery of the sound insulating panel 5 is covered with tank reinforcing members 4 ₁ , 4 ₂ , 4 ₃ and 4 _4. The tank reinforcing ribs 7 ₁ and 7 ₂ are attached by direct welding.

As shown in FIGS. 4 and 5, the sound insulation panel 5 has a pair of sound insulation plates 5a and 5b facing each other, and four or more sides sandwiched between the sound insulation plates 5a and 5b to form a closed space 9. Frame-shaped reinforcing ribs 5c ₁ , 5c ₂ , 5c ₃ and 5c ₄ and a cross-shaped reinforcing rib 5d arranged inside the frame-shaped reinforcing rib 5c.

  The pair of sound insulating plates 5a and 5b, the frame-shaped reinforcing rib 5c, and the cross-shaped reinforcing rib 5d are all made of iron plates, and the respective contact portions are fixed by welding. Since the pair of sound insulating plates 5a and 5b are welded by the cross-shaped reinforcing ribs 5d, vibration can be suppressed. Since the sound insulation panel 5 is usually manufactured in the atmosphere, air is contained in the closed space 9.

  As shown in FIG. 3, the sound insulation panel 5 manufactured in this way is attached so that the frame-shaped reinforcing rib 5 c and the sound insulation plate 5 a are submerged in the concave space 8 while leaving only the sound insulation plate 5 b. For this reason, the vertical and horizontal dimensions of the sound insulating plate 5a are selected to be smaller than the sound insulating plate 5b by an amount equivalent to the welding allowance (W).

Meanwhile, the sound insulation plate 5a and sound insulating plate frame-like reinforcing ribs 5c sandwiched 5b are band-shaped reinforcing ribs _5c 1 of the four _sides, 5c 2, 5c ₃ and opposite sides of the 5c ₄ (5c ₁ and _5c 3, 5c ₂ and 5c ₄ ) are assembled so that the attachment angle between adjacent sides (the angle between adjacent sides) is tilted by 4 degrees or more so that they are in a non-parallel state. In the example of FIG. 4, the mounting angle θ ₁ between the reinforcing ribs 5c ₁ and 5c ₂ and the mounting angle θ ₄ between the reinforcing ribs 5c ₁ and 5c ₄ are both smaller than 90 ° by 4 degrees or more, and vice versa. reinforcing ribs 5c mounting angle theta ₂ between ₂ and 5c _3, the mounting angle theta ₃ between the reinforcing ribs 5c ₃ and 5c ₄ is is made larger than 4 degrees than both 90 ° to. For this reason, the reinforcing ribs 5c ₁ and 5c ₃ and the reinforcing ribs 5c ₂ and 5c ₄ are in a non-parallel state.
In FIG. 4, the frame-shaped reinforcing rib 5 c is composed of four reinforcing ribs, but may be composed of five or more reinforcing ribs.

(Function)
Thus, between the tank reinforcing members 4 ₁ , 4 ₂ , 4 ₃ and 4 ₄ attached to the tank outer surface 3 in order to form a plurality of ridges in the lateral direction, and tank reinforcing ribs 7 ₁ , 7 _2. · · · 7 _n and sound insulating panel 5 covering the concave space portion 8 formed in the tank outer surface 3 may be, mounted free to change the mounting number and the mounting range in accordance with the vibration and noise specifications stationary induction apparatus can do.

Moreover, since the sound insulation panel 5 is made of an iron plate, it is inexpensive, and the surface of the concave space 8 surrounded by the tank reinforcing members 4 ₁ , 4 ₂ , 4 ₃ and 4 ₄ and the tank reinforcing ribs 7 ₁ and 7 _2. Since the sound insulation panel 5 is attached by direct welding so as to cover, the attachment work is easy.

  Further, since the sound insulation panel 5 is firmly attached to the outer surface 3 of the tank by welding, a heavy load support member such as a conservator, a radiator mount, or a bushing pocket can be directly attached to the surface of the sound insulation panel 5. The structure of the member can be simplified. In addition, when it is necessary to install a structure such as a pocket or an oil pipe in the vicinity of the mounting position of the sound insulation panel 5, it is easy to make the structure by providing a notch in the sound insulation panel 5 before attaching the sound insulation panel 5. Can be installed in.

  Furthermore, since the two sound insulation plates 5a and 5b that face each other form a closed space, the sound insulation performance of the sound transmitted through the sound insulation panel 5 is enhanced. When the sound insulation panel 5 is configured through the closed space of the two sound insulation plates 5a and 5b, from one sound insulation plate (that is, a sound insulation plate of the same mass) having a thickness equal to the total thickness of the two sheets. High sound insulation effect can be obtained. This means that an intermediate layer is formed between the two sound insulation plates 5a and 5b to effectively use the impedance difference between the medium and the sound insulation panel 5 that becomes a resistance when acoustic energy is input to the sound insulation panel 5. Because you can.

Furthermore, resonance of sound in the closed space 9 is prevented by attaching the four sides of the reinforcing ribs 5c ₁ , 5c ₂ , 5c ₃ and 5c ₄ constituting the frame-shaped reinforcing rib 5c with an inclination angle of 4 degrees or more. be able to. In the case of noise generated from a static induction appliance, the problem is usually noise with a frequency of 100 Hz to 500 Hz, and its half wavelength is 340 mm to 1700 mm.

  The resonance of the sound occurs in the direction in which the integral multiple of the half wavelength of the sound in question and each dimension of the closed space 9 are approximately equal. When sound resonance occurs in the closed space 9, the sound energy attenuated by the sound insulation panel 5 is amplified again, and the sound insulation performance is lowered. Further, by installing a cross-shaped rib 5d on the surface of the sound insulation plates 5a and 5b in a closed space 9 formed between the sound insulation plates 5a and 5b facing each other, a vibration reduction effect on the surface of the sound insulation panel 5 is achieved. Both sound insulation performance can be obtained.

(effect)
As described above, according to the first embodiment, a plurality of tank reinforcing members are juxtaposed in the lateral direction and fixed to the tank outer surface 3, and the tank reinforcing members are joined together by tank reinforcing ribs. Since the sound insulation panel is attached by direct welding to the opening of the space formed by these tank side surfaces, tank reinforcement members and tank reinforcement ribs, a sufficient vibration reduction effect can be obtained and a foundation for attaching the sound insulation panel is unnecessary. Thus, the mounting work becomes easy, so that the number of manufacturing steps and the manufacturing cost can be reduced.

  Moreover, the sound insulation panel can freely change the mounting range according to the specifications of vibration and noise, and an optimal structure and low-cost stationary induction device according to the noise specifications can be obtained.

  In addition, since the sound insulation panel is directly welded to the tank reinforcement member so as to cover the concave space formed between the tank reinforcement members, heavy objects (conservator, radiator mount, bushing pocket, etc.) are attached to the surface of the sound insulation panel. As a result, the device can be made compact.

  Furthermore, by attaching the four ribs constituting the frame-shaped reinforcing ribs at an angle of 4 degrees or more, the resonance of the sound in the closed space can be prevented, further improving the sound insulation performance and reducing the number of manufacturing steps. In addition, it is possible to provide a static induction electric device that is low in cost and has a high vibration reduction effect and high soundproofing effect.

[Embodiment 2]
Hereinafter, the static induction device according to the second embodiment will be described with reference to FIG.
FIG. 6 is a transparent side view of the sound insulation panel 5 employed in the second embodiment.
As shown in FIG. 6, the sound insulation panel 5 employed in the second embodiment is a vacuum in the closed space 9 formed between the pair of sound insulation plates 5a and 5b facing each other and the frame-shaped reinforcing rib 5c. is there. The shape of the frame-shaped reinforcing rib 5c itself is the same as that of FIG.

  Thus, by keeping the inside of the closed space 9 of the sound insulation panel 5 in a vacuum state, there is no sound propagation in the closed space 9 and transmission loss is increased, so that the soundproofing effect is further enhanced as compared with the first embodiment. I can expect.

  As described above, according to the second embodiment, by keeping the closed space 9 in a vacuum, it is possible to suppress the propagation of sound in the closed space, and to provide a static induction appliance having a higher soundproofing effect.

[Embodiment 3]
Hereinafter, the static induction device according to the third embodiment will be described with reference to FIG.
FIG. 7 is a perspective side view of the sound insulation panel 5 employed in the third embodiment.
The sound insulation panel 5 employed in the third embodiment is in a vacuum state in the closed space 9 formed between the pair of sound insulation plates 5a and 5b and the frame-shaped reinforcing ribs 5c facing each other as shown in FIG. A vacuum valve 10 is attached to the outer surface of the sound insulating plate 5b constituting the closed space 9.

  Since the sound insulation performance is lowered when the degree of vacuum in the closed space 9 of the sound insulation panel 5 is lowered after long-term operation of the stationary induction machine, in the third embodiment, the vacuum valve 10 communicating with the inside of the closed space 9 of the sound insulation panel 5 is used. A pressure gauge (not shown) is attached, and the pressure in the closed space 9 is confirmed by the pressure gauge. If the degree of vacuum is low, the vacuum valve 10 is connected to a vacuum pump and the inside of the closed space 9 is again in a good vacuum state. Can be kept in.

  As described above, according to the third embodiment, by attaching a vacuum valve to the surface of the sound insulation panel, it is possible to monitor and maintain the vacuum layer in the sound insulation plate closed space after the sound insulation panel is attached. A static induction device capable of maintaining reliability and sound insulation performance can be provided.

[Embodiment 4]
Hereinafter, the stationary induction device according to the fourth embodiment will be described with reference to FIG.
FIG. 8 is a perspective side view of the sound insulation panel 5 employed in this embodiment.
As shown in FIG. 8, the sound insulation panel 5 employed in the fourth embodiment is in a vacuum state in the closed space 9 formed between the pair of sound insulation plates 5a and 5b and the frame-shaped reinforcing ribs 5c facing each other, and A vacuum reverse support valve 11 communicating with the internal closed space 9 is attached to the outer surface of the sound insulating plate 5b constituting the closed space 9.

  Thus, by attaching the vacuum reverse support valve 11 to the surface of the sound insulation panel 5, the closed space inside the sound insulation plate can be easily kept in a vacuum, and the installation area can be reduced compared to the vacuum valve. The support structure for heavy objects (conservator, radiator mount, bushing pocket, etc.) can be simplified on the surface of the sound insulation board, and the manufacturing cost can be reduced.

  As described above, according to the fourth embodiment, it is possible to effectively use the space on the surface of the sound insulating plate by attaching the vacuum back support valve 11 to the surface of the sound insulating plate 5b, and obtain it at a lower cost than the vacuum valve. It is possible to provide a static induction electric machine that can reduce the manufacturing cost, downsize the device, and excel in soundproofing performance.

[Embodiment 5]
Hereinafter, the static induction device according to the fifth embodiment will be described with reference to FIG.
FIG. 9 is a perspective side view of the sound insulation panel employed in this embodiment.
As shown in FIG. 9, the sound insulation panel 5 employed in the fifth embodiment is in a vacuum state in the closed space 9 formed between the pair of sound insulation plates 5a and the sound insulation plates 5b facing each other and the frame-shaped reinforcing rib 5c, and A vacuum pipe 12 communicating with the internal closed space 9 is attached to the outer surface of the sound insulating plate 5b constituting the closed space 9, and the sound insulating panels 5 are connected to each other in FIG. 10 and FIG. Connect as shown.

  As described above, according to the fifth embodiment, the vacuum work can be performed at once in the closed space 9 of the plurality of sound insulation panels by attaching the vacuum pipe 12 to the surface of the sound insulation board 5b. An easy static induction machine can be provided.

[Embodiment 6]
Hereinafter, the stationary induction device according to the sixth embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a front view of the sound insulation panel of the sixth embodiment, and FIG. 13 is a side view.
The sound insulation panel 5 employed in the sixth embodiment is obtained by attaching a sandwich type damping plate 13 in the closed space 9 based on the sound insulation panel 5 shown in FIG.

  That is, as shown in FIGS. 12 and 13, a sandwich-type damping plate 13 in which an inner surface of a sound insulating plate 5b on the surface side of the sound insulating panel 5 is combined with an aluminum constraining plate and an adhesive layer having properties of both rubber and clay. Is attached.

  Thus, by attaching the sandwich-type damping plate 13 combining the aluminum plate and the adhesive layer to the inner surface of the sound insulating plate 5b, a phase difference occurs in the bending of the two steel plates during vibration transmission. Thus, a shearing force is generated, and vibration energy is absorbed and changed into thermal energy, so that radiation of sound due to vibration of the sound insulation panel 5 surface can be reduced.

  As described above, according to the sixth embodiment, the vibration of the surface of the sound insulation panel 5 of the sound insulation panel 5 is reduced by attaching the sandwich type vibration control plate 13 combining the aluminum plate and the adhesive layer to the inner surface of the sound insulation plate 5b on the surface side. The effect is enhanced, the sound insulation performance of the sound insulation panel 5 is greatly improved, and the sandwich-type damping plate 13 can be obtained at a very low cost, so that it is possible to provide a static induction electric device that is low in cost and excellent in sound insulation performance.

[Embodiment 7]
Hereinafter, the stationary induction device according to the seventh embodiment will be described with reference to FIG.
FIG. 14 is a see-through side view of the sound insulation panel employed in the seventh embodiment.
As shown in FIG. 14, the sound insulation panel 5 according to the seventh embodiment has a sound absorbing material 14 filled in a closed space 9 formed between a pair of sound insulation plates 5a and 5b facing each other and a frame-shaped reinforcing rib 5c. There is an effect that the sound that enters the sound absorbing material 14 in the closed space 9 is absorbed in the sound absorbing material 14 and is not transmitted through the sound insulating plate 5b.

  As described above, according to the seventh embodiment, since the sound absorbing material 14 is filled in the closed space 9 of the sound insulation panel, the sound entering the closed space 9 is absorbed in the sound absorbing material 14. Therefore, no sound is transmitted. The sound-absorbing material 14 itself is inexpensive, easy to obtain, has a long life, and can be used in any place, so that it is possible to provide a static induction device with a high soundproofing effect by reducing the number of manufacturing steps.

[Embodiment 8]
Hereinafter, the stationary induction device according to the eighth embodiment will be described with reference to FIG.
FIG. 15 is a perspective side view of the sound insulation panel employed in this embodiment.
As shown in FIG. 15, the sound insulation panel 5 employed in the eighth embodiment is such that a liquid 15 is filled in a closed space 9 formed between a pair of sound insulation plates 5a and 5b facing each other and a frame-shaped reinforcing rib 5c. It is.

  The sound insulation panel 5 according to the eighth embodiment has a greater sound attenuation than that in which the gas (air) is enclosed in the closed space 9 as in the first embodiment. Even if there is a sound source with a large acoustic output in the liquid and it emits a high level of sound, the difference in the specific acoustic resistance between the air and the liquid is so large that the sound is almost reflected at the contact surface and into the air. Because it does not come out almost, it does not become a loud noise level that makes people in the atmosphere feel bothersome.

  As described above, according to the eighth embodiment, the liquid sealed in the closed space 9 of the sound insulation panel 5 vibrates the liquid when sound is transmitted through a substance having a considerably higher density than the gas. Therefore, a large amount of energy is required, and the attenuation of sound is larger than that in the air, and a static induction device with a higher soundproofing effect can be provided.

[Modification]
In the above description, the tank reinforcing members 4, 4 ₁ to 4 ₄ are set in the vertical direction, and the tank reinforcing ribs 7, 7 _{11 to} 7 ₃₂ are set in the horizontal direction. The reinforcing members 4, 4 ₁ to 4 ₄ may be set in the horizontal direction, and the tank reinforcing ribs 7 and 7 _{11 to} 7 ₃₂ may be set in the vertical direction.

1 ... stationary induction apparatus main body, 2 ... tanks, 3 ... tank side, _4,4 1-4 4 _... tank reinforcing member, 5 ... sound insulating panel, 5a ... sound insulating plate, 5b ... sound insulating plate, 5c ... frame-shaped reinforcing ribs, 5d: cross-shaped reinforcing rib, 6: foundation, 7, 7 _{11 to} 7 ₃₂ ... tank reinforcing rib, 8 ... concave space, 9 ... closed space, 10 ... vacuum valve, 11 ... vacuum reverse valve, 12 ... Piping for vacuum, 13 ... Sandwich type damping plate, 13 ... Sound absorbing material, 15 ... Liquid.

Claims (9)

A tank for storing the main body of the static induction device,
A tank reinforcing member fixed so that a plurality of ridges are formed in the vertical direction or lateral direction of the tank outer surface with respect to the outer surface of the tank;
Tank reinforcing ribs for joining the tank reinforcing members,
A sound insulation panel attached by welding so as to cover the space formed by the tank reinforcing member and the tank reinforcing rib;
A static induction machine having
The sound insulation panel is disposed so as to form two or more sound insulation plates facing each other and a closed space between the sound insulation plates. A stationary induction device comprising a frame-like reinforcing rib which is made non-parallel.   The sound insulation panel is provided with a cross-shaped reinforcement rib that is joined to the sound insulation plate and prevents vibration of the sound insulation plate in the closed space formed by two or more sound insulation plates and a frame-shaped reinforcement rib that are opposed to each other. The static induction machine according to claim 1, wherein   2. The stationary induction device according to claim 1, wherein the sound insulation panel makes a vacuum state in the closed space formed by two or more sound insulation plates facing each other and a frame-shaped reinforcing rib.   The sound insulation panel is characterized in that the closed space formed by two or more opposing sound insulation plates and frame-shaped reinforcing ribs is in a vacuum state, and a vacuum valve is attached to the outer surface of the sound insulation plate. 3. The static induction machine according to 3.   The sound insulation panel is characterized in that the closed space formed by two or more opposing sound insulation plates and frame-shaped reinforcing ribs is in a vacuum state, and a vacuum reverse valve is attached to the outer surface of the sound insulation plate. Item 4. The static induction machine according to item 3.   The sound insulation panel is a vacuum state in the closed space formed by two or more sound insulation plates facing each other and a frame-shaped reinforcing rib, and a vacuum pipe is attached to the outer surface of the sound insulation plate constituting the closed space, The stationary induction machine according to claim 3, wherein the closed spaces of the plurality of sound insulation panels are communicated with each other by piping.   The sandwich type damping board which combined the adhesive layer which has the property of both an aluminum restraint board and rubber | gum and clay is attached to either one of the opposing sound insulation boards which comprise the said sound insulation panel, or characterized by the above-mentioned. 2. The static induction machine according to 2.   The static induction device according to claim 1 or 2, wherein the sound insulation panel is filled with a sound absorbing material in the closed space formed by two or more sound insulation plates and frame-shaped reinforcing ribs facing each other.   The static induction device according to claim 1, wherein the sound insulation panel fills the closed space formed by two or more sound insulation plates and frame-shaped reinforcing ribs facing each other.

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