JPH06163284A - Transformer apparatus - Google Patents

Abstract

PURPOSE:To restrain noise radiation generated between transformer tanks of a transformer apparatus whose transformer tank is divided into a plurality of tanks on account of transportation limitation. CONSTITUTION:A part between the end portions of transformer tanks 1a, 1b is covered with soundproofing sheets 10, 11, 12 which are oscillating insulated and isolated from both of the tanks 1a, 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer device for electric power transmission and distribution used in a substation or the like, in which noise generated between transformer tanks divided into a plurality due to transportation restrictions is suppressed.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing the structure of a conventional single-phase transformer device for a substation, for example. In the figure, 1a and 1b
Each is an independent transformer tank that houses a transformer element, and is divided by the size and weight restrictions during transportation.
Reference numerals 2 and 3 are ducts through which connection leads (not shown) for connecting the two transformer tanks 1a and 1b pass, and the duct 2 is, for example, a duct for high-voltage leads of about 1.5 m in diameter and 500 KV,
The duct 3 is, for example, a low-voltage lead duct with a diameter of about 1 m and 275 KV. 4 and 5 are bushings of high and low voltage terminals of the transformer connected to the switchgear of the substation, 6 is a heat exchanger of a cooler for radiating heat generated by copper loss or iron loss to the atmosphere, and 7 is heat. A pump for circulating the cooling medium in the transformer of the exchanger 6, 8 a fan for supplying air for cooling the heat exchanger 6, and 9 a shield for exciting noise generated by the transformer element, A soundproof cover for reducing noise from the container, which is configured as an iron container that integrally surrounds the two transformer tanks 1a and 1b.

The noise of the transformer depends on the insulation class and the capacity unless soundproofing measures are taken, but the noise of the transformer body is 8%.
It is about 5 to 90 dB (A). This is as shown as the standard value in the Japan Electrical Manufacturers' Association Standard (JEM-1118). In the high-voltage, large-capacity transformer for 500 KV power transmission shown in the above-mentioned conventional example, the noise of the transformer main body is usually about 90 dB (A) unless soundproof measures are taken. In addition to the transformer main body, noise is also generated due to the fan motor exciting sound of the cooler and the wind noise of the fan, which is usually about 75 dB (A). On the other hand, the boundary noise of substations is not regulated by ordinances. For example, in the case of Tokyo, it is said that the nighttime 45 dB (A) or less must be achieved in the severest type 1 area. There are usually 6 substations in mountainous areas.
A demand of 5 dB (A) or less is made. On the other hand, conventionally, the transformer main body is housed in the soundproof cover 9 made of iron for soundproofing the main body, while the fan motor for driving the cooler fan has a low rotational speed, for example, about 400 rpm. Is used for soundproofing.

Next, the design of these soundproofing measures will be described. First of all, the actual design of the soundproof wall is decided in consideration of the increase in sound pressure due to the reflection of the sound in the soundproof wall and the sound leakage from the opening provided in the soundproof wall, but the explanation is not complicated. Therefore, these are ignored, and the structure of the basic soundproof wall is evaluated by only the sound transmission loss represented by the following formula 1. Formula 1 is described on page 71 of the Electric Joint Research Vol. 33, No. 2, "Substation Noise Countermeasures". TLo = 20 log (ωm / 2ρc) (dB) (1) TLo ・ ・ ・ Transmission loss for vertically incident wave (dB) ω ・ ・ ・ Angular velocity 2πf (HZ) m ・ ・ ・ Area density of wall (kg) / M ² ) ρ ... Air density (kg / m ³ ) c ... Sound velocity in air (m / sec) According to the above formula 1, the surface density m (kg / m ² ) of the sound barrier is The larger the thickness, the larger the transmission loss. Therefore, the thicker the material, and the higher the density, the higher the sound insulation effect. For example, when the noise of the transformer main body is 90 dB (A) and the thickness t (mm) of the iron plate soundproof wall required to set the transformer main body noise outside the soundproof wall to 57 dB (A) is calculated, The density is 7.
9 × 10 ³ kg / m ³ , air density 1.293 kg / m
³ , TLo = 90-5 with sound velocity of 340 m / sec
7 = 20 log ₁₀ (2π × 100HZ × 7.9t) /
(2 × 1.293 × 340), from which the thickness t of the steel plate soundproof wall becomes 7.9 (mm).

Next, the noise of the fan of the cooler is expressed by the following equation 2 according to the description in the above-mentioned Electric Joint Research Vol. 33, No. 2, page 87.
Becomes SPL = SPLo + 70log ₁₀ (D / Do) + 50log ₁₀ (N / No) ・ ・ ・ (2) SPL ・ ・ ・ Cooling fan noise (dB) SPLo ・ ・ Standard cooling fan noise (dB) D ・ ・ ・ Cooling fan Outer diameter (mm) Do ... Standard cooling fan outer diameter (mm) N ... Rotational speed (r.p.m) No ... Standard rotational speed (r.p.m) For example, reference Noise 75 dB at 1000 rpm rpm
When the number of revolutions of the cooling fan of (A) is reduced to 75 dB (A) or less by lowering the number of revolutions without changing the shape of the fan, it can be calculated from Equation 2 that 57 = 75−70log
_{10 (Do / Do) + 50log} 10 (N / 1000) , and the rotational speed N from this is a 437 (r.p.m) below. However, the cooling capacity of the cooler is the 33rd
According to page 21 of Vol.
Since it decreases in proportion to the 0.5th power, if the number of coolers before soundproofing is not set in order to secure the initially required cooling capacity, if three transformers are used per transformer element, the above proportion will be obtained. Calculating with a constant of 0.55, 3 units x 1 /
(437/1000) ^0.55 = 4.7 units, which means that 5 transformers are required for each transformer element. That is, the number of coolers is increased by taking soundproof measures.

When the soundproof wall and the cooler are designed as described above, and the combined noise value of each is determined, the combined noise value is expressed by the following formula 3 according to the Electric Joint Research Vol. Become. L (SPL) = ₁₀ log ₁₀ (10 ^{L1 / 10} +10 ^{L2 / 10} ) ... (3) L ₁ ... Noise of sound source 1 (dB) L ₂ ... Noise of sound source 2 (dB) ) L (SPL) / Noise of synthetic sound (dB) Substituting a numerical value into Equation 3, L (SPL) = 10 log (1
0 ^57/10 +10 ^57/10 ) = 60 dB. This is a soundproofing design for a transformer with a margin of 5 dB (A) for the substation boundary noise specification of 65 dB, which is ignored in this calculation and is reflected by the sound inside the sound barrier and the sound leaks from the opening. Has been done.

On the other hand, considering the radiation of noise from the transformer body, the noise radiation surface is, as shown in FIG. 8, for the transformer tanks 1a and 1b A to E and A ₁ to respectively.
There are 5 sides of E ₁ . Also, two transformer tanks 1a, 1
The surfaces of the ducts 2 and 3 connecting between b also serve as noise emission surfaces. As shown in FIG. 9, as compared with an integrated transformer which is not restricted by transportation restrictions and is not divided into two transformer elements, the noise is increased by the surface integrals of the inner tank surfaces D and D ₁ and the connecting ducts 2 and 3. It becomes the radiation surface. Now, assuming that the radiant energy of noise per unit surface area of the transformer tank is constant, the transformer shown in FIG. 8 has a surface integral of surfaces D, D ₁ and ducts 2 and 3 as compared with the transformer shown in FIG. Only the noise level is high. That is, assuming that the noise value generated on each surface of the transformer body shown in FIG. 8 is the value shown in Table 1 below, the noise generated by the transformer body is the sum of the noise generated on each surface. SPL = 10log
₁₀ (10 ^79/10 × 4 + 10 ^78/10 × 4 + 10 ^80/10 × 4)
= 90 dB (A).

[0008]

[Table 1]

However, the noise generated by the transformer main body shown in FIG. 9 is shown in Table 1, side surfaces D, D ₁ , connection ducts 2, 3
No surface noise is generated, so the sum of the noise generated on each surface is
SPL = ₁₀ log ₁₀ (10 ^79/10 × 4 + 10 ^78/10 ×
2 + 10 ^80/10 × 2) = 88! It becomes dB (A), and FIG.
The value is 2 dB (A) lower than the transformer shown in. When the soundproof wall thickness t (mm) that gives 57 dB (A) outside the soundproof wall is obtained by this formula 1 using this value, TLo = 88! −
57 = 20 log ₁₀ (2π × 100HZ × 7.9t) /
(2 × 1.293 × 340), and thus the soundproof wall thickness t is 6.3 (mm). Therefore, the soundproof wall thickness 7.9 (mm) of the transformer shown in FIG. 8 obtained by the above equation 1 requires the soundproof wall to be strengthened by increasing the body noise by the difference between these two values. On the other hand, if the thickness of the soundproof wall is 7.9 (mm) as in the conventional case, the noise value outside the soundproof wall is 88-TLo = 88!
-20 log ₁₀ (2π × 100HZ × 7.9 × 7.9)
/(2×1.293×340)=55! It becomes dB (A), and the noise reduction condition on the cooler side can be relaxed.
For the noise value L ₂ allowed on the cooler side, the above equation 3 is applied,
L (SPL) = ₁₀ log ₁₀ (10 ^55/10 +10 ^{L2 / 10} )
= 60 dB (A), L2 = 58.3 dB (A)
Will be allowed. Therefore, the rotational speed N of the cooling fan can be calculated by applying the equation 2 to obtain 58.3 = 75−70.
log ₁₀ (Do / Do) +50 log ₁₀ (N / 100
0), and from this, N = 463 (r.p.m).
Since the cooling capacity of the cooler is proportional to the 0.55th power of the fan speed, in the case of the transformer shown in Fig. 8 in which the transformer body is divided, the allowable value of the speed of rotation is 437 (rpm). Therefore, (437/463) ^0.55 × 100 = 97%,
This means that the cooling capacity is sacrificed.

[0010]

The conventional transformer device is thus separated from the transport restrictions into two transformer elements,
Since this is configured to be connected by a connecting duct, the noise radiating area of the transformer main body increases, which makes the soundproof wall thicker and the fan of the attached cooler to achieve the target value of soundproofing. There was a problem that the number of rotations had to be lowered at the sacrifice of the cooling capacity.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a transformer device capable of suppressing radiation of noise generated between transformer tanks.

[0012]

[Means for Solving the Problems] Claim 1 according to the present invention
The transformer device of the above is a transformer device in which a plurality of transformer elements are housed in independent tanks, and the tanks are installed side by side in a soundproof cover. The transformer device according to claim 2 is covered with an insulating and soundproof wall, and the end portions of the opposing tank surfaces are connected and sealed with a soundproof sheet containing lead fibers, and the soundproof sheet is stored in the tank. And a vibration-damping spring for vibration isolation.

[0013]

According to the present invention, the soundproof wall and the soundproof sheet connecting between the ends of the transformer tank surfaces facing each other of the transformer device seal the both tank surfaces and suppress the emission of noise from this portion.

[0014]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a perspective view showing the structure of a transformer device according to a first embodiment of the present invention. In the figure, 1a and 1b to 8 are the same as those of the conventional device, and therefore the description thereof is omitted. Two transformer tanks 1 are indicated by shaded lines 10, 11 and 12 in the figure.
3a, 1b, which are three surfaces facing each other, that is, a soundproof sheet for connecting and sealing the respective end portions of the front surface portion, the ceiling portion, and the back surface portion. It is composed of a large and heavy sheet material. FIG. 2 shows the support structure of the soundproof sheet 10 on the front part of the transformer tanks 1a and 1b. Reference numeral 13 denotes a cylindrical portion 10a provided at an end edge of the soundproof sheet 10 to insert the soundproof sheet 10 into the curtain. It is a support wire for hanging in a shape,
Both ends of the transformer tank 1a, 1
It is attached to b. Therefore, the support wire 13 maintains a sufficient tension for supporting the soundproof sheet 10 by the damping spring 14, and the propagation of vibration from the transformer tanks 1a and 1b is suppressed. The soundproof sheet 12 on the back surface is also provided in the same manner. FIG. 3 shows a support structure for the soundproof sheet 11 in the ceiling portion. As with the support structure for the front and back portions, the support wire 13 is inserted through the tubular portion 11a provided in the soundproof sheet 11, and the support wire 1
3 is stretched between the transformer tanks 1a and 1b via a damping spring 14. As shown in FIG. 4, a plurality of support wires 13 are arranged at a required pitch in consideration of the size, weight, etc. of each soundproof sheet 10, 11, 12. Further, the soundproof sheet 11 on the ceiling portion has a hanging bottom edge portion 1 that overlaps with the soundproof sheets 10 and 12 on the front and back portions.
1b is provided to prevent noise from leaking from the boundary between the ceiling and the front. FIG. 5 shows the structure of the joint portion between the soundproof sheets 10, 11, 12 and the transformer tanks 1a, 1b. That is, a sound insulating plate 15 using a damping steel plate or the like is provided on the outer side of the facing inner surfaces of the transformer tanks 1a and 1b, and the soundproof sheet 1 is attached to the magic tape 16 attached to the sound insulating plate 15.
By tightly fixing the edges of 0 and 11, noise leakage from the joint is prevented.

In the transformer configured as described above,
First, when the noise generated from the surfaces of the transformer tanks 1a and 1b sealed with the soundproof sheets 10, 11 and 12 is calculated, the noise generated from the inner side surfaces D and D ₁ and the connection ducts 2 and 3 in Table 1 is calculated. It is the sum of noise. Here, when the sum is obtained using Equation 3, SPL = ₁₀ log ₁₀ (10 ^80/10 × 2 + 10
^78/10 x 2) = 85! It becomes dB (A). On the other hand, the effect of the soundproof sheet is that when a soundproof sheet containing lead fibers and having a thickness of about 1 mm is applied, its surface density becomes about 5 kg / m ^2, and the transmission loss is calculated using Equation 1, and TLo = 20 l
og (2π × 100HZ × 5) / (2 × 1.293 × 3
40) = 11 dB (A), and the transmitted sound from the soundproof sheet portion is 85! dB (A) -11 dB (A) = 74! dB
(A). From this, when the sum of the sound generated from the surface of the transformer tank other than the soundproof sheet portion and the transmitted sound from the soundproof sheet portion is calculated, SPL = ₁₀ log ₁₀ (10 ^79/10
× 4 + 10 ^78/10 × 2 + 10 ^80/10 × 2 + 10 ^{74! / 10} ) =
The value is 88.3 dB (A), which is almost equal to the noise generated by the main body of the integrated transformer that does not consider transport restrictions, and it is clear that the sound insulation effect is sufficiently achieved. The soundproof sheets 10, 11 and 12 are composed of a plurality of wires 13 stretched between the transformer tanks 1a and 1b via a damping spring 14.
Since the end portions of the tank surface are connected and sealed by being supported by, the effect of suppressing noise emission is further enhanced.

Example 2. In the first embodiment, the soundproof sheet contains lead fibers, but a plate material such as a normal steel plate may be used. However, in this case, in order to avoid the rise of noise due to the reflection of the sound inside the sealing, as shown in FIG. 6, the one in which the sound absorbing material 18 is superposed on the inner surface of the sound insulating plate material 17 is applied. Must be self-supporting from the foundation to prevent the propagation of vibrations from the transformer tanks 1a and 1b.

Embodiment 3. Further, in each of the above-described embodiments, the transformer tank is divided into two, but the same effect can be obtained by applying it to a transformer device divided into three or more.

[0018]

As described above, according to claim 1 of the present invention, a space between the opposite ends of the tank surface is covered with a soundproof wall which is vibrationally insulated from the tank, and according to claim 2. , The ends of the opposing tank surfaces are connected and sealed with a soundproof sheet containing lead fibers, and the soundproof sheet is vibrationally insulated and isolated via a tank and a damping spring, thus strengthening and cooling the soundproof wall. It is possible to provide a transformer device capable of suppressing radiation of noise generated between transformer tanks without sacrificing the cooling capacity of the transformer.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a transformer device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a soundproof sheet supporting structure on front and rear portions of the transformer tank shown in FIG.

3 is a perspective view showing a support structure of a soundproof sheet on a ceiling portion of the transformer tank shown in FIG.

FIG. 4 is a perspective view showing a support structure for the entire soundproof sheet shown in FIG.

FIG. 5 is a perspective view showing a structure of a joint portion between the soundproof sheet and the transformer tank according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the structure of a soundproofing board material according to Embodiment 2 of the present invention.

FIG. 7 is a perspective view showing a structure of a conventional transformer device.

FIG. 8 is a perspective view showing a noise emission surface in the transformer device in which the tank is divided.

FIG. 9 is a perspective view showing the structure of an integrated transport type transformer device.

[Explanation of symbols]

 1a, 1b Transformer tank 2, 3 Duct 4, 5 Bushing section 6 Heat exchanger 7 Pump 8 Fan 9 Soundproof cover 10, 11, 12 Soundproof sheet 13 Support wire 14 Damping spring 15 Sound insulation plate 16 Magic tape 17 Sound insulation plate material 18 Sound absorbing material

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 6, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

The noise of the transformer depends on the insulation class and the capacity unless soundproofing measures are taken, but the noise of the transformer body is 8%.
It is about 5 to 90 dB (A). This is as shown as the standard value in the Japan Electrical Manufacturers' Association Standard (JEM-1118). In the high-voltage, large-capacity transformer for 500 KV power transmission shown in the above-mentioned conventional example, the noise of the transformer main body is usually about 90 dB (A) unless soundproof measures are taken. In addition to the transformer main body, noise is also generated due to the fan motor exciting sound of the cooler and the wind noise of the fan, which is usually about 75 dB (A). In contrast, the boundary noise of substations is regulated by regulations .
In the case of Tokyo, for example, it is said that the nighttime 45 dB (A) or less must be achieved in the severest type 1 area, and it is usually 65 in substations in the mountain area.
A demand of less than dB (A) is made. On the other hand, conventionally, the transformer main body is housed in the soundproof cover 9 made of iron for soundproofing the main body, while the fan motor for driving the cooler fan has a low rotational speed, for example, about 400 rpm. Is used for soundproofing.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

Next, the noise of the fan of the cooler is expressed by the following equation 2 according to the description in the above-mentioned Electric Joint Research Vol. 33, No. 2, page 87.
Becomes SPL = SPLo + 70log ₁₀ (D / Do) + 50log ₁₀ (N / No) ・ ・ ・ (2) SPL ・ ・ ・ Cooling fan noise (dB) SPLo ・ ・ Standard cooling fan noise (dB) D ・ ・ ・ Cooling fan Outer diameter (mm) Do ... Standard cooling fan outer diameter (mm) N ... Rotational speed (r.p.m) No ... Standard rotational speed (r.p.m) For example, reference Noise 75 dB at 1000 rpm rpm
For the cooling fan of (A), the rotation speed for reducing the noise to 75 dB (A) or less is obtained by reducing the rotation speed without changing the shape of the fan. From Equation 2, 57 = 75 + 70log
_{10 (Do / Do) + 50log} 10 (N / 1000) , and the rotational speed N from this is a 437 (r.p.m) below. However, the cooling capacity of the cooler is the 33rd
According to page 21 of Vol.
Since it decreases in proportion to the 0.5th power, if the number of coolers before soundproofing is not set in order to secure the initially required cooling capacity, if three transformers are used per transformer element, the above proportion will be obtained. Calculating with a constant of 0.55, 3 units x 1 /
(437/1000) ^0.55 = 4.7 units, which means that 5 transformers are required for each transformer element. That is, the number of coolers is increased by taking soundproof measures.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

However, the noise generated by the transformer main body shown in FIG. 9 includes the side surfaces D and D ₁ of Table ₁ and the connecting ducts 2 and 3.
No surface noise is generated, so the sum of the noise generated on each surface is
SPL = ₁₀ log ₁₀ (10 ^79/10 × 4 + 10 ^78/10 × 2
+10 ^80/10 × 2) = 88.1 dB (A), which is shown in FIG.
The value is 2 dB (A) lower than the transformer shown in. When the soundproof wall thickness t (mm) which is 57 dB (A) outside the soundproof wall is obtained by this formula 1 using this value, TLo = 88.1
−57 = 20 log ₁₀ (2π × 100HZ × 7.9t)
/(2×1.293×340), and the soundproof wall thickness t becomes 6.3 (mm). Therefore, the soundproof wall thickness 7.9 (mm) of the transformer shown in FIG.
It is necessary to strengthen the sound barrier by increasing the noise of the main body by the difference between these two values. On the other hand, the thickness of the soundproof wall is 7.9 (mm) as before.
Then, the noise value outside the sound barrier is 88-TLo = 8.
_{8.1 -20log 10 (2π × 100HZ ×} 7.9 ×
7.9) / (2 × 1.293 × 340) = 55.1 dB
In the case of (A), the noise reduction condition on the cooler side can be relaxed. The noise value L ₂ allowed on the cooler side is calculated by the above formula 3
And L (SPL) = ₁₀ log ₁₀ (10 ^55/10 +
10 ^{L2 / 10} ) = 60 dB (A), L2 = 58.
3 dB (A) will be allowed. Therefore, the rotational speed N of the cooling fan is calculated by applying the equation 2 to obtain 58.3.
_{= 75-70log 10 (Do / Do)} + 50log
₁₀ (N / 1000), from which N = 463 (r.
pm). Since the cooling capacity of the cooler is proportional to the 0.55th power of the fan speed, in the case of the transformer shown in FIG.
(Rppm), so (437/463) ^0.55 x 1
00 = 97%, which means that the cooling capacity is sacrificed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

In the transformer configured as described above,
First, when the noise generated from the surfaces of the transformer tanks 1a and 1b sealed with the soundproof sheets 10, 11 and 12 is calculated, the noise generated from the inner side surfaces D and D ₁ and the connection ducts 2 and 3 in Table 1 is calculated. It is the sum of noise. Here, when the sum is obtained using the equation 3, SPL = ₁₀ log ₁₀ (10 ^80/10 × 2 + 10 ^7
8/10 × 2) = 85.1 dB (A). On the other hand, the effect of the soundproof sheet is that when a soundproof sheet containing lead fibers and having a thickness of about 1 mm is applied, its surface density becomes about 5 kg / m ^2, and the transmission loss is calculated using Equation 1, and TLo = 20 l
og (2π × 100HZ × 5) / (2 × 1.293 × 3
40) = 11 dB (A), and the transmitted sound from the soundproof sheet portion is 85.1 dB (A) -11 dB (A) = 74.1.
It becomes dB (A). From this, when the sum of the sound generated from the surface of the transformer tank other than the soundproof sheet portion and the transmitted sound from the soundproof sheet portion is calculated, SPL = ₁₀ log ₁₀ (10
^{79/10 × 4 + 10 78/10 × 2} + 10 80/10 × 2 + 10 7 4. 1 /
^{1 0)} = ^88.3dB (A), and this value is almost equal to the body noise generated integral type transformer without considering transport limitations, it is clear that the sound insulating effect is sufficiently achieved. In addition, each soundproof sheet 10, 11, 12 is the transformer tank 1
Since the ends of the tank surface are connected and sealed by being supported by a plurality of wires 13 stretched between a and 1b via a damping spring 14, a further excellent noise emission suppressing effect is exhibited. .

Claims (2)

[Claims] 1. A transformer device in which a plurality of transformer elements are housed in independent tanks, and the tanks are arranged side by side in a soundproof cover. A transformer device characterized in that it is covered with a soundproof wall that is insulated and isolated. 2. A transformer device in which a plurality of transformer elements are housed in independent tanks, and the tanks are arranged side by side in a soundproof cover, and lead fibers are included between the ends of the opposing tank surfaces. A transformer device, wherein the soundproof sheet is connected and sealed by a soundproof sheet, and the soundproof sheet is vibrationally insulated and isolated from a tank via a damping spring.