JPS6224108Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an upper shaft sealing device for hermetically sealing a vertical rotating body such as a flywheel device.

Heretofore, as a device of this type, there has been a flywheel device shown in FIG. 1 in a vertical cross-sectional view. Reference numeral 1 denotes a rotating shaft, which is directly connected to a generator motor (not shown). Reference numeral 2 denotes a flywheel that is fitted into and integrally fixed to this rotating shaft, which converts electrical energy into rotational inertia energy, stores it, and releases it when necessary to convert it into electrical energy. 3 is a sealed frame for accommodating the flywheel 2 and surrounding it in a vacuum; 4
and 5 are an upper bracket and a lower bracket that are airtightly attached to this sealed frame; 6 is a rolling bearing to which lubricating oil is supplied from an oil supply pipe 7; 8
is the end cover. 9 is a hydrostatic journal bearing,
Pressure lubricating oil is supplied from the oil supply pipe 12, and the rotating shaft 1
is supported in a floating state in the radial direction. 10 is a bearing support that supports the journal bearing 9 in a self-aligning manner;
11 is fixed to the lower bracket 5 and is a bearing support 10
The support member 13 to which the support member 13 is attached is a hydrostatic thrust bearing, to which pressure lubricating oil is supplied from an oil supply pipe 15 and received in a floating state relative to the thrust collar 16 of the rotating shaft 1. A bearing support 14 supports the thrust bearing 13 in a self-aligning manner, and is attached to the lower bracket 5. Reference numeral 17 denotes a magnetic bearing, in which an electromagnet 18 is disposed on the upper end surface of the flywheel 2 with a predetermined gap therebetween, and a concentric excitation coil 19 is installed. is supported by By energizing the excitation coil 19, the flywheel 2 is attracted and bears the thrust load, thereby minimizing losses in the rolling bearing 6 and the thrust bearing 13.

Reference numeral 21 denotes an upper sealing container which encloses the rotating shaft 1 and is airtightly attached to the upper surface of the electromagnet 18, and is partitioned into an atmosphere side chamber 22 and a vacuum side chamber 23. 24 is an upper non-contact seal ring shaft sealing device, which is constructed as follows. Partition part 21a of sealed container 21
A seal ring is provided with a predetermined gap in the radial and axial directions in an annular storage chamber 25 formed on the inner diameter side of the rotary shaft 1, and surrounds the outer circumference of the rotating shaft 1 with a predetermined small gap. 26 are stored.

This seal ring 26 is provided with an annular groove on the inner circumference, and a large number of oil introduction holes are opened in the annular groove from the outer circumference in the radial direction at equal intervals in the circumferential direction.

Sealing oil is pressurized into the storage chamber 25 from the pressure oil pipe 27, guided to the annular groove through each oil introduction hole, and discharged upward and downward through the gap with the rotating shaft 1, leaving the seal ring 26 in a floating state without contact. The shaft is sealed to prevent outside air from entering the vacuum chamber 30 on the upper side. The sealing oil that floats the seal ring 26 and flows upward through the gap is collected in the atmosphere side chamber 22 together with the lubricating oil flowing down from the rolling bearing 6, is discharged outside the sealing frame 3 through the discharge pipe 28, and is sucked under negative pressure. be discharged. In addition, the sealing oil that leaked downward through the gap,
The oil is shaken off by the oil drainer 31 of the rotating shaft 1 and collected in the vacuum side chamber 23, taken out to the outside of the sealed frame 3 through the discharge pipe 29, sucked under negative pressure, and discharged.

Next, numeral 32 denotes a lower sealed container which surrounds the rotary shaft 1 and is airtightly attached to a partition plate 33 which is airtightly attached to the lower bracket 5. 34 is a lower non-contact seal ring shaft sealing device, which is constructed as follows. A seal ring 36 is housed in an annular storage chamber 35 formed on the inner diameter side of the bottom of the sealing container 32 with a predetermined gap therebetween, and which surrounds the outer circumference of the rotating shaft 1 with a predetermined small gap. has been done.

Sealing oil is pressurized into the storage chamber 35 from the pressure oil pipe 37, and the seal ring 36 is brought into a floating state for non-contact shaft sealing, thereby preventing outside air from entering the vacuum chamber 30 on the lower side. The sealing oil that floats the seal ring 36 and flows upward through the gap is shaken off by the oil drainer 39 of the rotating shaft 1, collected in the sealing container 32, and discharged to the outside of the lower bracket 5 through the discharge pipe 38, where it is sucked under negative pressure. and discharged. In addition, the sealing oil flowing downward through the gap, along with the lubricating oil flowing out from the journal bearing 9 and the thrust bearing 13, flows through the lower oil drain pipe 40.
It is taken out of the bracket 5, sucked under negative pressure, and discharged.

41 is a vacuum suction tube connected to the sealed frame 3, and the vacuum chamber 30 is drawn by a vacuum pump (not shown).
maintain a vacuum. 42 is a cover plate attached to the inspection window of the lower bracket 5. 43 is an annular gasket, and 44 to 47 are O-rings.

In the conventional device described above, the rotating shaft 1 is rotated at high speed together with the flywheel 2. Due to the action of the magnetic bearing 17, the thrust loads on the rolling bearing 6 and the hydrostatic thrust bearing 13 are minimized, thereby minimizing bearing loss. The vacuum chamber 30 in the sealing frame 3 is sealed off from the atmosphere by the upper and lower non-contact seal ring shaft sealing devices 24 and 34, and is evacuated by a vacuum pump to eliminate windage damage to the rotating body. Although the flywheel 2 is attracted by the magnetic bearing 17 and rotates at high speed, the hydrostatic journal bearing 9 prevents it from wobbling in the radial direction, and the hydrostatic thrust bearing 13 prevents it from wobbling in the axial direction. Furthermore, when the magnetic bearing 17 loses its function due to a power outage or the like, the thrust bearing 13 bears the thrust load until the rotating body stops to prevent damage.

In the above conventional device, the upper sealing ring shaft sealing device 24 is located in the sealing frame 3, and the sealing container 2
In addition, the pressure oil pipe 27 and the discharge pipe 28 must be installed within the sealed frame 8, and the discharge pipe 28 is a large-diameter pipe.
had to be drawn out of the sealed frame 8 through inclined piping, which was troublesome work. With these,
The sealing frame 3 has become larger in the axial direction, and the volume of the vacuum chamber 30 has also increased, increasing the required capacity of the vacuum pump. Note that the upper seal ring shaft sealing device 24 is located within the sealing frame 3 below the rolling bearing 6, and therefore the rolling bearing 6 requires dedicated oil supply means and waste oil collection and discharge means.

This idea places the upper shaft sealing device outside the sealing frame and attaches it to the top of the upper bracket, making the sealing frame smaller in the axial direction, reducing the volume of the vacuum chamber, and improving the sealing of the upper shaft sealing device. Simplify piping such as oil supply pipes and discharge pipes to make work easier.
In addition, the upper bearing is located below the upper seal ring shaft sealing device, and is lubricated using the sealing oil flowing down from the shaft sealing device, and is vertically shaped, eliminating the need for a dedicated lubricating means for the bearing or a means for collecting and discharging waste oil. An object of the present invention is to provide an upper shaft sealing device for hermetically sealing a rotating body.

FIG. 2 is a longitudinal cross-sectional view of the upper half of the vertical flywheel device showing the upper shaft sealing device according to an embodiment of the invention, and is a vertical sectional view of the upper half of the vertical flywheel device.
6, 31, 41, 44, and 45 are the same as those in the conventional device. 50 is a sealed frame that houses the flywheel 2 and forms a vacuum chamber 51 inside. Reference numeral 52 designates an upper bracket that is airtightly attached to the sealing frame 50, and supports a rolling bearing 6, which serves as an upper bearing, on its inner diameter. Reference numeral 53 denotes an external enclosure that encloses the rotating shaft 1 and closes the upper bracket 52.
It is airtightly attached to the top and is partitioned into an atmospheric side chamber 54 and an intermediate chamber 55. 56 is a non-contact seal ring shaft sealing device, which is constructed as follows. A seal ring 26 is provided in an annular storage chamber 57 formed on the inner diameter side of the partition portion 53a of the sealing container 53 with a predetermined gap therebetween, and surrounds the outer circumference of the rotating shaft 1 with a predetermined small gap. is stored.

Seal oil is pressurized into the storage chamber 57 from the pressure oil pipe 58, and the seal ring 26 is brought into a floating state to form a non-contact shaft seal, thereby preventing outside air from entering the vacuum chamber 51 on the upper side. The sealing oil that floats the seal ring 26 and flows upward through the gap is collected in the atmosphere side chamber 54 and is sucked under negative pressure by the discharge pipe 59 and discharged. Further, a part of the sealing oil that has flowed downward through the gap slips through the rolling bearing 6 and flows down.
The other part of the sealing oil that has flowed downward is collected in the intermediate chamber 55 and drained into the oil drain hole 5 provided in the bracket 52.
Flows down 2a.

Reference numeral 60 denotes an internal sealed container which surrounds the rotating shaft 1 and is airtightly attached to the upper surface of the electromagnet 18, forming a vacuum side chamber 61. The sealing oil flowing down the rolling bearing 6 is shaken off by the oil drainer 31 of the rotating shaft 1 and collected in the vacuum side chamber 61. Further, the sealing oil that has flowed down through the oil drain hole 52a is also collected in the vacuum side chamber 61. The sealing oil collected in the vacuum side chamber 61 is
It is taken out of the sealed frame 50 by a discharge pipe 62,
Negative pressure is sucked and discharged. 63 and 64 are O-rings for airtight sealing.

Since the rolling bearing 6 is lubricated by the flowing seal oil, the conventional dedicated oil supply pipe 7 is not required. Also,
The upper piping inside the sealed frame 50 is a discharge pipe 62.
This makes the work easier.

Although the above embodiment shows the case where the flywheel device is surrounded by the vacuum chamber 51, other rotating bodies may be used, or in the case of a rotating machine in which the shaft is sealed with other gas, such as nitrogen, enclosed. It can also be applied to

As described above, according to this invention, since the upper shaft sealing device is located outside the sealing frame, the sealing frame can be made smaller in the axial direction, and the sealing oil piping only needs to be a discharge pipe within the sealing frame. The implementation is simple, and no special oil supply means and waste oil collection and discharge means for the upper bearing are required. Furthermore, the volume within the sealed frame is reduced, and the capacity of the vacuum pump or the enclosed gas pump can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a vertical flywheel device showing a conventional upper shaft sealing device, and Fig. 2 is an upper half of a vertical flywheel device showing an upper shaft sealing device according to an embodiment of the invention. FIG. 1...rotating shaft, 2...flywheel, 6...
Rolling bearing, 26... Seal ring, 50...
Sealing frame, 51...Vacuum chamber, 52...Upper bracket, 53...Sealing container, 56...Non-contact seal ring shaft sealing device, 57...Storage chamber, 60...
Closed container.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A seal ring attached to the outside of an upper bracket fixed to a sealing frame that houses a vertical rotating body, and provided in a storage chamber that surrounds a rotating shaft extending from and penetrating the vertical rotating body. The seal ring is housed with a gap between the radial and axial directions, and this seal ring has an annular groove on the inner circumference, and a number of radial oil introduction holes are drilled in the annular groove from the outer circumference. A gap is provided around the outer circumference of the rotary shaft, and sealing oil is press-fitted into the storage chamber and guided from the oil introduction hole to the annular groove to connect the rotary shaft and the seal ring. A non-contact seal ring shaft seal device that drains the gap upward and downward and seals it without contact. It is located below this shaft seal device, is attached to the above-mentioned upper bracket, and is lubricated by sealing oil flowing down from the shaft seal device. The upper bearing is disposed below the upper bracket and surrounds the rotation shaft, and lubricates the upper bearing and collects drained sealing oil flowing down and drained sealing oil flowing directly from the shaft sealing device. An upper shaft sealing device for airtightly sealing a vertical rotating body, characterized in that it is equipped with a sealing device for discharging water to the outside. (2) Hermetic sealing of a vertical rotating body according to claim 1 of the utility model registration claim, characterized in that the rotating body consists of a flywheel fixed to a rotating shaft, and a vacuum chamber is formed within a sealed frame. upper shaft sealing device.