JPS6098841A - Vibration preventing device of vertical shaft rotary electric machine - Google Patents

Abstract

PURPOSE:To enable to operate a stable rotary electric machine by operating a hydraulic jack in response to the thermal expansion or contraction of liquid in the jack. CONSTITUTION:A plurality of hydraulic jacks 7 are disposed radially to an axial center in an annular space between a supporting bracket arm 4 and a foundation 6. When the temperature at the periphery of the jacks 7 rises so that the liquids in a bearing support 9 and a cylinder chamber 7a thermally expand with the result that a load to the foundation 6 tends to become excess, a safety valve 23 flows out the liquid to a storage tank 18, thereby preventing the pressure from becoming excess. On the contrary, when the temperature in the periphery of the jacks 7 decreases, a pressure switch 21 is closed to operate a hydraulic pump 17 by a motor 16, and liquid 19 in the tank 18 is supplied to the chamber 7a.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a barrier provided between a foundation and a bearing support that supports a guide bearing of an axle rotating electric machine such as a spindle water turbine generator or a generator motor for pumped storage power generation. Concerning improvements in shaking devices.

[Technical background of the invention and its problems]

FIG. 1 shows a schematic longitudinal cross-sectional view of a vertical rotating electrical inlet equipped with a conventional vibration isolator. An axle-rotating electric machine such as a large-capacity axle-shaft water turbine generator or a generator-motor for pumped storage power generation, which exchanges electrical energy and mechanical energy by rotating a vertical rotor (2) within a stator (1), is Since the excitation force of the water wheel or pump water wheel is large and the guide bearing span of the rotating electric machine is long, it is necessary to make the spring constant of the upper guide bearing (3) particularly high. Therefore, a vibration isolator (5) is installed at the end of the support bracket arm (4), which is the bearing support for the upper guide bearing (3).
is provided to support the space between it and the foundation (6).

In the case of early small-capacity rotating electric machines, installation protection f:
;' used an elastic body such as rubber or a leaf spring, but in large-capacity machines, the radial length of the support bracket arm (4) of the upper guide bearing (3) is long, making it difficult to operate the rotating cage. ,
Due to thermal expansion and contraction due to stopping, the strain of the elastic body of the vibration isolator changes, and the spring constant of the support system increases or decreases. If the spring constant increases too much, there is a risk of destroying the foundation (6).
If it decreases too much, the vibration of the rotating electric machine will increase and become dangerous. Therefore, the invention closest to the present invention as a vibration isolating device for compensating for this thermal expansion and contraction is shown in Fig. 1.
This is based on Publication No. 24. According to this prior art example, it can be seen that thermal expansion and contraction of the support bracket arm (4) is certainly compensated for by means of movement of liquid in the hydraulic jack (5). For example, during thermal expansion, the liquid in the base cylinder chamber (5A) on the right side in Figure 1 flows 180 degrees to the opposite side, that is, to the left bracket 0111 cylinder chamber (5a), and also to the left base side cylinder chamber. (s b ) Toru moves to the right bracket side cylinder chamber (5B) and a! Since it is a piston (5C
) can be thermally stretched with little resistance in the radial direction. However, this liquid is sealed in a closed circuit, and although the pressure is constant at the temperature at which it was initially injected, the temperature of the rotating electrical machine and its surroundings may change due to changes in the output of the rotating electrical machine or between summer and winter. When the cooling water 6 changes due to different conditions, etc., the liquid itself thermally expands or contracts, which changes the spring constant of the vibration isolator (5) and, by extension, the spring constant of the entire guide bearing support system. Moreover,
The amount of expansion and contraction cannot be ignored since the amount of liquid in the cylinder chamber is small. This is because, if the liquid in the columnar chamber is, for example, oil, the coefficient of thermal expansion of the oil is approximately 160' times that of the steel of the structure such as the support bracket arm. About 17
This is because adding a support bracket arm with a length of m would be problematic. For this reason, if the liquid itself expands thermally, the base? i
! +! If it is destroyed and contracts, the vibration suppression effect will be lost. Therefore, the prerequisite for the invention of the above publication is that the liquid itself does not undergo thermal expansion or contraction, and either the inventor has developed a liquid that does not cause thermal expansion or contraction, or a constant temperature It is not clear from the description in the above publication whether a constant temperature device is provided, but at least to the present inventor, a liquid that does not cause thermal expansion or contraction is unknown, and according to the inventor's estimates, it is extremely unlikely to provide a constant temperature device. It has become expensive and unusable.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive vibration isolating device for an axle-rotating electrical machine that can safely and reliably isolate vibrations even if the liquid itself in a hydraulic jack expands or contracts thermally.

[Summary of the invention]

The present invention comprises a chamber shaft type rotor, a guide bearing that pivotally supports the rotor, a bearing support that supports the guide bearing, and a vibration isolator that supports the bearing support. The vibration device is installed in the annular space between the bearing support and the foundation.
A plurality of hydraulic jacks are arranged radially around the t-center, and one of the pistons or cylinders of the hydraulic jacks is in contact with the bearing support and the other is in contact with the foundation, and each cylinder chamber is connected to fluid supply and drainage piping. The liquid supply header is connected to a liquid supply header through a check valve, and the liquid supply header is connected to a liquid supply pipe that supplies liquid from a liquid storage tank with a liquid supply pump equipped with an electric motor that is connected to a power supply via an electric switch. When the liquid pressure in the liquid supply and drainage pipes between the cylinder chamber and the check valve becomes lower than a predetermined low pressure, the power switch is closed, and all the liquid supply and drainage pipes are closed. A pressure switch that opens the power switch when the liquid pressure exceeds a predetermined medium pressure, and a pressure switch that opens the power switch when the liquid pressure in the supply and drainage pipe exceeds a predetermined high pressure, causes the liquid in the supply and drainage pipe to flow out to the liquid storage tank. By providing a safety valve, it is possible to safely and reliably dampen vibrations even if the liquid in the hydraulic jack thermally expands or contracts with an inexpensive structure.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In these figures, the same reference numerals as those in FIG. 1 are given to parts, and explanations thereof will be omitted.

In the annular air jHJ between the support bracket arm (4) and the foundation (6)'! A hydraulic jack (force) is applied radially to the second core.To compensate for the lack of dimension, add an auxiliary structure (8) to the support bracket arm (4) and attach the bearing support (9). The liquid is supplied to and drained from the liquid supply/drainage device (Ll) to a predetermined pressure a through the hydraulic jack (the cylinder chamber (7a) is supplied with the JP liquid pipe θ0). In the above, the cylinder side of the hydraulic jack (7) is fixed off based on the base, and the piston (7b) is fixed to the bearing support (9), but this arrangement fd may be reversed, or the fixed position may be fixed to the bearing support (9). The fluid supply/drainage system (11) connects each of the seven cylinder chambers (7a) to the fluid supply/drainage piping α0), each of which is connected to a supply consisting of an annular pipe through a check valve □. The liquid header 0 tank is connected to the liquid storage tank (domestic) with a liquid supply pump (17) equipped with an electric Q; A liquid supply pipe 12f) for supplying the liquid σω is provided.

The supply and drainage pipe (1o) between the cylinder chamber (7a) and the check valve Q21 has a power switch that closes when the fluid pressure in the supply and drainage pipe (10) drops below a predetermined low pressure. make it work,
A pressure switch ←υ is provided in a known sequence to open the power switch (1ω) when the liquid pressure in all the liquid supply and drainage pipes (10) reaches a predetermined medium pressure or higher.

In addition, this liquid supply/drainage pipe (+1) has a ring-shaped pipe that drains the liquid in the liquid supply/drainage pipe GO+ when the liquid pressure in the liquid supply/drainage pipe 0 becomes a predetermined high pressure or higher. Liquid header (2 and U
A safety valve 3a is provided to allow the liquid to flow out through the liquid piping (c) to the storage tank ((g).Furthermore, the safety valve is equipped with a normally open drain valve (3) for convenient draining of liquid during disassembly. Install two in parallel.

Next, the effect will be explained.

The liquid is pressurized into the cylinder chamber (7a) of the hydraulic jack at a pressure within a predetermined low pressure and medium pressure range.

Here, for example, if the temperature around the hydraulic jack (7) increases and the liquid in the bearing support (9) and cylinder chamber (7a) thermally expands, the load on the foundation (6) becomes excessive. In this case, the liquid pressure in the cylinder chamber (7a) will become excessive, but if the liquid pressure applied to the safety valve (2a) exceeds a predetermined high pressure, the liquid will flow out to the liquid storage tank marked O. There can be no excessive pressure, i.e. the base (61) and the guide bearing (3
) is hopeless if it becomes excessive. Conversely, the temperature around the hydraulic jack (7) decreases, and the liquid in the bearing support (9) and cylinder '14 (7a) contracts, causing the foundation (6) to decrease.
If the supporting force from the cylinder chamber (7a) to the guide bearing (3) is about to weaken, the hydraulic pressure in the cylinder chamber (7a) will become too low, but the pressure switch (21) will not be able to maintain the predetermined low pressure at any one location. When the water gets too low, the power switch (15+ is closed, electric, = U6) is operated, and the liquid supply pump (17) is driven, and the liquid in the liquid storage tank o8) is driven. The liquid is supplied from the liquid supply header (1) to the cylinder chamber (7a) via the reverse valve (12) to increase the liquid pressure. When the medium pressure (between the predetermined high pressure that activates the safety valve and the pressure switch 0) exceeds the power switch (between the predetermined low pressure and the predetermined low pressure that works on the power switch (11+1 < 1) that makes the safety valve conductive), the pressure switch When υ opens the power switch (lω), the liquid supply pump a is stopped, i.e.
The supporting force between the foundation (6) and the guide bearing (3) cannot become too small.

Next, considering the case where the guide bearing (3) supports the eccentricity of the rotor (2), the piston (7b) on the eccentric side
) side, the liquid in the hydraulic cylinder chamber (7a) tries to return to the liquid supply header enclosure, but
Since there is a check valve <12, it cannot be returned. Therefore, the hydraulic pressure in the cylinder chamber (7a) increases, the supporting force of the guide bearing (3) increases, and the eccentricity of the rotor (2) is suppressed. The main purpose of the safety valve C24) is to avoid destruction of base jj, F(6), usually]11! Of course, the pressure is set to such a level that the eccentric force that may occur during rotation will not cause the opening.

According to the present embodiment, the bearing support that supports the guide bearing (3) in the radial direction may Even if (9) thermally expands or contracts, the hydraulic jack (7) can adapt to this and maintain a more or less constant supporting force from the foundation (6).

Naturally, due to the eccentricity of the rotor (2), the guide bearing (3), the bearing support (9), the hydraulic jack (
If the screw (7b) in 7) is pushed in one direction, there is no check valve, so the hydraulic pressure in the cylinder chamber (7a) increases and the force transmitted to the foundation (6) increases. has a high deflection, and the load capacity of the guide bearing (3) on that side increases, so eccentricity of the rotor (2) is suppressed. That is, the function of the guide 11 + receiver (3) of the spindle rotating electrical machine is always sufficiently developed, stable operation is possible, and it can withstand severe starting and stopping.

In addition, the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. Alternatively, the reliability can be further improved by increasing the number of parallel bearings.Also, the bearing support (9) is an auxiliary O;4 structure (8).
It is also possible to remove only the support bracket arm (4). It can also be applied to lower guide bearings.

〔Effect of the invention〕

As explained above, according to the present invention, the bearing support body that supports the guide bearing in the radial direction and the liquid of the hydraulic jack have a predetermined supporting force (which can also be called rigidity) even against temperature changes. Since it is maintained within the set range, it is possible to operate the rotary type without noticing the decrease in supporting force as in the past and cause the wheel to vibrate significantly, or conversely, excessive pressure is applied to the base ωy and the base (g) There are no problems such as cracks in the concrete, extremely stable operation is possible, and an inexpensive vibration isolator for a spindle rotating electrical machine with significantly improved reliability can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view showing a spindle rotating electrical machine equipped with a conventional vibration isolator and its foundation, and Fig. 2 is a schematic vertical cross-sectional view showing a spindle rotating electrical machine equipped with an embodiment of the vibration isolator of the present invention and its foundation. FIG. 3 is a longitudinal Ifr plane and a pipe system diagram showing an enlarged view of the main part of FIG. 2, and FIG. 4 is a pipe system diagram showing the main part of another embodiment. 2... Rotor 3... Guide bearing 4... Support bracket arm 6... Foundation 7... Hydraulic jack 7a... Cylinder chamber 7b... Piston 8... Auxiliary structure 9 ... Bearing support body 10 ... Fluid supply and drainage piping
11... Liquid supply/drainage device 12... Check valve 13... Liquid supply header 14... Power supply 15... Power switch 16.
...Electric motor 17...Liquid supply pump 18...Liquid storage tank 1
9...Liquid 20...Liquid supply piping 2...Pressure switch 22...
・Drain header 24...Safety valve 25...Drain valve Representative Patent attorney Inoue -Male Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) This vibration isolator consists of a shaft type rotor, a guide bearing that pivotally supports this rotor, a bearing support that supports this guide bearing, and a vibration isolator that supports this bearing support. The device has a plurality of hydraulic jacks arranged radially with respect to the axis in an annular space between the bearing support and the foundation, and either the piston or the syring of the hydraulic jack is connected to the bearing support, and the other is connected to the bearing support. The cylinder chambers are connected to the liquid supply header through check valves, and each cylinder chamber is connected to the liquid supply header through a check valve, and the liquid supply header is equipped with a power supply equipped with an electric motor connected to the power source via a power switch. A liquid supply pipe is installed to supply liquid from a liquid storage tank using a liquid pump, and the liquid supply and drain pipe between the cylinder chamber and the check valve is equipped with a liquid supply pipe that supplies liquid from a liquid storage tank. When the power switch is closed and the reduced pressure in all the liquid supply/drainage pipes reaches the specified medium pressure or higher, the pressure switch opens the source switch and the liquid pressure in the liquid supply/drainage pipes reaches the specified high pressure or higher. R111 is characterized in that it is equipped with a safety valve that allows the liquid in the liquid supply/drainage part to flow out to the liquid storage tank.
Anti-vibration device for rotating electric machines. (2) Each safety valve is connected to a drain in parallel with a normally closed drain valve, and the liquid is drained from the drain header to an oil storage tank. Vibration isolating device for an axle rotating electric machine as described in .