JP2002206488A - Jack oil supply device for large rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jack oil supply device for a large rotary machine, capable of heating a screw pump by utilizing the lubricating oil, before starting the operation of the large rotary machine. SOLUTION: In comparison with the conventional one, this jack oil supply device 1 is provided additionally with an oil circulation system 2 for forcibly flowing a part of the lubricating oil 99 to a screw pump 6, when a lubricating oil supply device 9 is operated by utilizing the discharge pressure of a main oil pump 92, when the operation of the lubricating oil supply device 9 is stopped, so that a jack oil cleaning device is eliminated. The oil circulation system 2 is provided with a solenoid valve 21 and a fixed throttle body 22, in series with each other along a flow route, and the piping for the jack oil 79 at a discharge side of the screw pump 6 is connected to the lubricating oil tank 91 through the piping for the lubricating oil 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack oil supply device using a screw pump for a large rotating machine such as a steam turbine or a generator, which uses lubricating oil before starting operation of the large rotating machine. The present invention relates to a configuration that enables heating of all screw pumps.

[0002]

2. Description of the Related Art In large-sized rotating machines such as electric and industrial turbines and generators driven by turbines, their bearings are constructed on the assumption that lubricating oil is constantly supplied. A lubricating oil supply device for supplying lubricating oil to bearings and the like is provided. Further, in such a large rotating machine, a high-pressure jack (generally exceeding 10 times the lubricating oil pressure value) for supporting a large weight of the rotating portion applied to the bearing at a low speed at the time of starting and stopping the machine. A jack oil supply device for supplying oil to the bearing is also provided.
Then, the jack oil diverges the lubricating oil supplied from the lubricating oil supply device, and pressurizes to a predetermined high pressure value by a screw pump (also referred to as a screw pump) of the jack oil supply device and supplies it as jack oil. It is common. Hereinafter, a conventional example of a jack oil supply device for a large rotating machine will be described with reference to FIGS.

FIG. 3 is a main part piping diagram showing a conventional jack oil supply device for a large rotating machine together with a lubricating oil supply device. FIG. 4 shows a variable throttle device of the lubricating oil supply device. FIG. In FIG. 3, reference numeral 9 denotes a lubricating oil supply device for supplying lubricating oil 99 to a turbine device (not shown), and reference numeral 7 denotes a conventional jack oil supply device for supplying jack oil 79 to a bearing of a large rotating machine. It is. The lubricating oil supply device 9 includes a lubricating oil tank 91 for storing the lubricating oil 99, main oil pumps 92 and 92 used for pressurizing the lubricating oil 99, coolers 93 and 93 for cooling the lubricating oil 99,
The variable throttle device 8, oil purifying devices 94 and 94 for keeping the lubricating oil 99 clean, a pipe 95 for the lubricating oil 99, and a supply pipe 96 are provided.

[0004] In the lubricating oil supply device 9, as in the case of a turbine device, even if the cooler 93 is damaged, a coolant (not shown) of the cooler 93 supplies the lubricating oil 99. The discharge pressure value of the main oil pump 92 is set higher than the lubricating oil pressure value required by the turbine device in order to prevent the oil from being mixed into the oil. The variable throttle device 8 is installed to reduce a high pressure value of the lubricating oil 99 obtained by the main oil pump 92 so that a required lubricating oil pressure value is obtained in a bearing portion of the turbine device or the like.
In this case, as shown in FIG.
It has a casing 81, a drawing body 84, a pressing body 87, a fixing nut 88, and a lid 89, and a seal body (O-ring) for sealing a lubricating oil 99 is provided at a key position.

The casing 81 has a through hole 82 (formed perpendicular to the plane of FIG. 4) through which the lubricating oil 99 flows, and extends from the outer surface of the casing 81 to the through hole 82 and is perpendicular to the through hole 82. Bottomed screw hole 8 formed
3 The throttle body 84 is a cylindrical body in which a male screw 851 that fits into the bottomed screw hole 83 is formed on the outer periphery.
5 and an operation rod portion 86 formed concentrically with the throttle portion 85 at one end of the throttle portion 85. Operation rod part 8
Reference numeral 6 denotes a cylindrical body having a diameter smaller than that of the drawing portion 85. A male screw 861 is formed on an outer peripheral portion thereof, and an operation portion 862 (a minus screwdriver in this case) is provided at an end on the side opposite to the drawing portion 85. Groove) is formed. The cover 89 has a bottomed screw hole 891 that fits with the male screw 861.

To adjust the aperture of the variable aperture device 8, the operating portion 862 is operated to adjust the insertion amount of the aperture portion 85 into the through hole 82, and when the setting of the insertion amount is completed, the fixing nut 8 is adjusted.
At 8, the restricting portion 85 is fixed to the casing 81, and a cover 89 is provided to prevent dust and the like from entering the lubricating oil 99.
Attach and complete. In FIG. 3, lubricating oil 99 set to a desired lubricating oil pressure value is supplied through pipes 95 from respective supply pipes 96 to a bearing or the like of a turbine device. The jack oil supply device 7 is a screw pump 6 for pressurizing the lubricating oil 99 branched from the pipe 95 of the lubricating oil supply device 9 to obtain the above-described high-pressure jack oil 79, and the jack oil discharged from the screw pump 6 An oil cleaning device 71 for cleaning 79 and a supply pipe 72 are provided.

[0007] In the jack oil supply device 7, in obtaining high-pressure jack oil 79 from the lubricating oil 99, high-pressure oil without pressure pulsation can be obtained only by a pump device without installing a device for suppressing pressure pulsation. , A screw pump 6 is employed. The jack oil 79 is supplied to the bearings of the turbine device from the respective supply pipes 72 during operation of the screw pump 6. When the turbine device is in a steady operation state (the turbine device is in a high-speed rotation state), the supply of the lubricating oil 99 is continued, but the operation of the screw pump 6 is stopped and the supply of the jack oil 79 is stopped. . Thus, when the turbine device is started, the supply of the lubricating oil 99 and the jack oil 79 to the turbine device by the lubricating oil supply device 9 and the jack oil supply device 7 is performed in the following procedure.

On condition that the operation of the lubricating oil supply device 9 can be started (for example, the temperature of each part including the lubricating oil 99 is equal to or higher than normal temperature), first, the operation of the lubricating oil supply device 9 is started. The lubricating oil 99 is circulated through the turbine device before the start of operation. However, the lubricating oil supply device 9 starts operating in a state where the refrigerant is not supplied to the cooler 93. In this state, the lubricating oil 99 is heated by the loss heat of the main oil pump 92 or the like, and the temperature of the lubricating oil 99 supplied to the turbine device is adjusted to a condition under which the operation of the turbine device can be started (for example, a lubricating oil temperature of 45 ° C.). Above). When the temperature of the lubricating oil 99 reaches a condition under which the operation of the turbine device can be started, the screw pump 6 of the jack oil supply device 7 is operated as a work on the turbine device immediately before the operation is started, and the jack is attached to the bearing of the turbine device. The oil 79 is supplied. Then, the temperature of each part becomes a condition under which the operation can be started, and the lubricating oil 99 and the jack oil 79 at a predetermined temperature and pressure are applied to the bearing and the like.
On the condition that is supplied, the operation of the turbine device is started.

[0009]

The jack oil supply device 7 according to the prior art described above can supply the jack oil 79 required by the turbine device. However, there is a problem described below, and it is desired to solve the problem. It is rare. The screw pump 6 used in the jack oil supply device 7 is, for example, in the case of a biaxial screw pump, a pair of (two) cylindrical cylinders having the same outer diameter and having mutually opposite screws formed on the outer peripheral surface. Have a structure in which screws are engaged with each other, and both ends of the rotor are supported by the casing and disposed in the casing. The screw pump 6 discharges high-pressure oil without pressure pulsation by operating the pair of rotors to rotate in opposite directions. And in order to get a high oil pressure value,
The mutual clearance between the screws of both rotors is set to a very small value.

[0010] The screw pump 6 starts operation when the turbine device is started (refer to the above-mentioned "Prior Art" section). At this time, the screw pump 6 which was still at room temperature is supplied with lubricating oil. Heated by oil 99 (having a temperature of 45 ° C. or higher, according to the section of the above “prior art”);
Each part causes thermal expansion. However, the rotor having a relatively small heat capacity and having a large heat receiving area from the lubricating oil 99 due to having a screw expands faster than the casing.

At this time, since the thermal expansion of the casing is slow, the center distance between the pair of rotors is not substantially different from the state before the start of operation, so that interference occurs between the screws of the rotor. Due to the interference between the screws of this rotor,
Not only is the screw pump 6 damaged, but also powdered metallic foreign matter generated by the damage mixes with the jack oil 79 and flows out of the screw pump 6, possibly damaging the bearings and the like of the turbine device. In order to cope with this, in the jack oil supply device 7 of the conventional example, the installation of the oil cleaning device 71 on the discharge side of the jack oil 79 of the screw pump 6 is indispensable.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a large rotary machine capable of heating a screw pump using lubricating oil before starting operation of the large rotary machine. To provide a jack oil supply device for a vehicle.

[0013]

According to the present invention, there are provided the following objects: 1) branching lubricating oil supplied from a lubricating oil supply device;
A jack oil supply device for a large rotating machine that supplies high-pressure jack oil to a bearing of a large rotating machine via a screw pump, wherein the lubricating oil is supplied when the operation of the lubricating oil supply device is stopped and the operation of the screw pump is stopped. An oil circulating system for forcibly flowing as a circulating oil into the screw pump, and heating the screw pump with the circulating oil; or 2) in the means described in the above item 1, the oil circulating system is The circulating oil is caused to flow through a screw pump by using a discharge pressure of a main oil pump of the lubricating oil supply device, or 3) In the means described in the above item 1, the oil circulating system includes: This is achieved by allowing the circulating oil to flow through the screw pump by utilizing a difference in oil pressure of the lubricating oil generated in the lubricating oil supply device.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, the same parts as those of the conventional jack oil supply device for large-sized rotary machines and the lubrication oil supply device of one example shown in FIGS. I do. In addition, in the drawings used in the following description, only the reference numerals shown in FIGS. 3 and 4 are representative. FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a main part piping system diagram showing a jack oil supply device for a large-sized rotary machine according to an embodiment of the present invention together with a lubrication oil supply device. In FIG. 1, reference numeral 1 denotes an oil circulation system 2 for a jack oil supply device 7 according to the conventional example shown in FIG.
Oil purifier 7 for jack oil 79
1 is a jack oil supply device configured to remove the oil.

The oil circulation system 2 forcibly applies a part of the lubricating oil 99 as the circulating oil 19 using the discharge pressure of the main oil pump 92 to the screw pump 6 when the lubricating oil supply device 9 is operating. It is an oil system that allows the flow. The oil circulation system 2 includes an electromagnetic valve 21 and a fixed throttle body 22 arranged in series with each other along a flow path of the circulation oil 19 and a jack on the discharge side of the screw pump 6. Oil 79
And the lubricating oil tank 91 are connected by the piping for the circulating oil 19. Accordingly, in the jack oil supply device 1, when the solenoid valve 21 is opened, the main oil pump 92 → the cooler 93 → the variable throttle device 8 → the oil purifying device 94 → the screw pump 6 → the solenoid valve 21 → the fixed throttle body 22 → the lubrication. An oil system through which the circulating oil 19 flows through the oil tank 91 is formed.

The fixed throttle body 22 is used for setting the flow rate of the circulating oil 19 flowing through the screw pump 6 when the lubricating oil supply device 9 is operating and the screw pump 6 is stopped.
The flow rate of the circulating oil 19 is, for example, the temperature of the screw pump 6 at the start of the operation of the turbine device, and the lubricating oil 9 at that time.
The flow rate is sufficient to be able to reach a temperature close to the temperature of No. 9. When the lubricating oil supply device 9 is operating and the screw pump 6 is stopped, the solenoid valve 21 is opened by a command device (not shown) or the like so that the circulating oil 19 flows through the screw pump 6. The valve 6 is closed at the start of operation.

The jack oil supply device 1 according to an embodiment of the present invention shown in FIG. 1 has the above-described configuration.
In a state where the lubricating oil supply device 9 is operating and the screw pump 6 stops operating, the circulating oil 19 having the above flow rate flows through the screw pump 6. At this point, the lubricating oil 99 is rising to 45 ° C. or higher, according to the section of the “prior art”. Therefore, the screw pump 6 is heated by the circulating oil 19 having the same temperature as the lubricating oil 99 at this time, and the entire temperature thereof is made substantially equal to the temperature of the circulating oil 19. That is, at the time when the temperature of the lubricating oil 99 reaches a condition under which the operation of the turbine device can be started and the jack oil 79 is supplied to the bearing of the turbine device (see the section of the above-mentioned “prior art”). The temperature of the screw pump 6 is substantially equal to the temperature of the jack oil 79. This is a matter of course because both the circulating oil 19 and the jack oil 79 are based on the lubricating oil 99.

Thus, in the jack oil supply device 1 according to the present invention, no interference problem occurs between the screws of the rotor of the screw pump 6 when the supply of the jack oil 79 to the bearing of the turbine device is started. Also, no powder metal foreign matter is mixed into the jack oil 79. This is the reason why the jack oil supply device 1 does not include the oil cleaning device 71. Since the screw pump 6 does not cause interference between the screws of the rotor and the oil cleaning device 71 is not installed, the jack oil supply device 1 of the present invention is
The maintenance work becomes much easier than the conventional jack oil supply device 7. Moreover, these advantages can be obtained without providing a device dedicated to heating or the like.

In the above description, the jack oil supply device 1 opens the solenoid valve 21 in all cases where the lubricating oil supply device 9 is operating and the screw pump 6 stops operating. However, when the screw pump 6 is maintained at a temperature of, for example, 45 ° C. or more by the operation of the turbine device, the screw pump 6 is stopped when the turbine device is stopped.
When no interference occurs between the screws of the rotor even when the jack oil 79 flows through the screw oil 79, even if the lubricating oil supply device 9 is operating and the screw pump 6 is stopped,
The solenoid valve 21 may not be opened. Also,
A return pipe (not shown) provided in the lubricating oil supply device 9 for returning the lubricating oil 99 supplied to the turbine device to the lubricating oil tank 91 as at least a part of a pipe for the circulating oil 19 connected to the lubricating oil tank 91. Piping).

Next, a jack oil supply device for a large rotating machine according to a different embodiment of the present invention will be described with reference to FIG. In the following description, the same portions as those of the jack oil supply device for a large rotating machine of the present invention shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. Here, FIG. 2 is a piping diagram of a main part showing a jack oil supply device for a large-sized rotary machine and a lubricating oil supply device according to a different example of the embodiment of the present invention. In FIG. 2, reference numeral 3 denotes FIG.
The jack oil supply device 1 according to the present invention shown in FIG.
The jack oil supply device includes an oil circulation system 4 in which a connection position of a pipe through which the circulating oil 19 flows is changed and a check valve 41 is used instead of the electromagnetic valve 21.

The connection position of the variable throttle device 8 in this case is different from that in FIGS. 1 and 3, but the function thereof is completely the same. As described above, the variable throttle device 8 is allowed to be installed at the terminal end of the flow of the lubricating oil 99 because it has a structure in which the generation of foreign matter does not occur. The oil circulation system 4 of the jack oil supply device 3 applies lubrication generated in the variable throttle device 8 to the screw pump 6 when the lubricating oil supply device 9 is operating, by using a part of the lubricating oil 99 as the circulating oil 19 when the operation is stopped. Oil 9
9 is an oil system for forcibly flowing by utilizing the oil pressure difference. The oil circulation system 4 includes a fixed throttle body 22 and a check valve 41 arranged in series with each other along a flow path of the circulating oil 19 and a lubricating oil of the variable throttle device 8. A connection is made between a pipe 99 on the inflow side of the screw pump and a pipe of jack oil 79 on the discharge side of the screw pump 6.

Thus, in the jack oil supply device 3, when the screw pump 6 is stopped, the lubricating oil 99 of the variable throttle device 8 flows in → the fixed throttle body 22 → the check valve 41 → the screw pump 6 →
An oil system through which the circulating oil 19 flows is formed on the path on the outflow side of the lubricating oil 99 of the variable throttle device 8. In this oil system, the pressure source through which the circulating oil 19 flows is a hydraulic pressure difference generated by the lubricating oil 99 in the variable throttle device 8. Since the variable throttle device 8 has a stable fluid resistance value as described with reference to FIG. 4, unlike the oil purifying device 94 in which the fluid resistance value fluctuates depending on the amount of foreign matter adhered, the circulating oil 19 is used. It is suitable as a pressure source for flowing through the screw pump 6. The check valve 41 allows the circulating oil 19 to flow when the discharge pressure value is lower than the pressure force value on the inflow side of the lubricating oil 99 of the variable throttle device 8 such as when the screw pump 6 is stopped. Is in operation, and the discharge pressure value is variable.
When the pressure value is higher than the pressure value on the inflow side of 9, the flow of the circulating oil 19 is blocked by the function of the check valve 41.

Since the jack oil supply device 3 according to a different embodiment of the present invention shown in FIG. 2 has the above-described configuration, the lubricating oil supply device 9 is operating and the screw pump 6 stops operating. In this case, the circulating oil 19 flows through the screw pump 6 as in the case of the jack oil supply device 1. This can prevent interference between the screws of the rotor of the screw pump 6 when the supply of the jack oil 79 to the bearing of the turbine device is started, without providing a device dedicated to heating or the like. Of powdery metallic foreign matter can also be prevented. The advantage of the jack oil supply device 3 over the jack oil supply device 1 is that it is not necessary to return the circulating oil 19 to the lubricating oil tank 91 and that the circulating oil 1
9 is that a relatively inexpensive check valve 41 can be used in place of the electromagnetic valve 21 for switching supply / stop to the screw pump 6.

As a result, the manufacturing cost of the jack oil supply device is reduced, and a device for instructing the operation of the solenoid valve 21 is not required, so that the manufacturing cost is reduced accordingly. In the above description with reference to FIG. 2, in the jack oil supply device 3 of the present invention, the check valve 41 is used for switching between supply / stop of the circulating oil 19 to the screw pump 6, but the invention is not limited to this. However, for example, the screw pump 6 is set to an appropriate temperature (for example, 4
When the temperature is maintained at 5 ° C. or higher, the solenoid valve 21 may be provided instead of the check valve 41. And in this case,
When the lubricating oil supply device 9 is in operation and the screw pump 6 stops operating and the turbine device is to be stopped, the solenoid valve 21 is set to the same state as in the case of the jack oil supply device 1 of the present invention. It can be operated so as not to open.

[0025]

According to the jack oil supply device for a large rotating machine according to the present invention, the following effects can be obtained by adopting the structure described in the section of the means for solving the above-mentioned problems. By adopting the configuration according to the first and second aspects of the present invention, the lubricating oil supply device 9 is in operation and the operation of the screw pump 6 is stopped when the lubricating oil 99 is stopped. Partially branched circulating oil 19 flows through the screw pump 6 using the discharge pressure of the main oil pump 6, and the screw pump 6
9 (similarly for the jack oil 79). This makes it possible to eliminate the problem of the interference of the rotor of the screw pump 6 when the supply of the jack oil 79 is started, and it is not necessary to install an oil purifying device for purifying the jack oil 79 discharged from the screw pump 6. It becomes possible to. Further, by adopting the configuration according to the third mode of the means for solving the above problems, the lubricating oil supply device 9 is in operation and the circulation oil 19 is supplied to the screw pump 6 when the operation of the screw pump 6 is stopped. Of the lubricating oil 99 generated in the lubricating oil supply device 9
This can be performed by utilizing the hydraulic pressure difference. This makes it possible to simplify the configuration of the flow path of the circulating oil 19 to the screw pump 6 while holding the effect of the above item as it is.

[Brief description of the drawings]

FIG. 1 is a main part piping system diagram showing a jack oil supply device for a large rotating machine according to an embodiment of the present invention together with a lubrication oil supply device.

FIG. 2 is a main part piping system diagram showing a jack oil supply device for a large-sized rotary machine according to a different embodiment of the present invention together with a lubrication oil supply device.

FIG. 3 is a main part piping system diagram showing a conventional jack oil supply device for a large rotating machine together with a lubrication oil supply device.

FIG. 4 is a sectional view showing a variable throttle device of the lubricating oil supply device.

[Explanation of symbols]

 Reference Signs List 1 jack oil supply device 19 circulating oil 2 oil circulation system 21 solenoid valve 22 fixed throttle body 6 screw pump 79 jack oil 9 lubricating oil supply device 91 lubricating oil tank 92 main oil pump 99 lubricating oil

Claims (3)

[Claims] A lubricating oil supply device for a large-sized rotary machine for supplying lubricating oil supplied from a lubricating oil supply device to a bearing of the large-sized rotary machine as high-pressure jack oil via a screw pump. An oil circulation system for forcibly flowing the lubricating oil as circulating oil to the screw pump when the operation of the screw pump is stopped when the lubricating oil supply device is operating is provided, and the screw pump is heated by the circulating oil. A jack oil supply device for a large rotating machine. 2. The jack oil supply device for a large rotary machine according to claim 1, wherein the oil circulation system uses the discharge pressure of a main oil pump of the lubrication oil supply device to pump the circulating oil into a screw pump. A jack oil supply device for a large rotating machine, characterized in that the oil flows through the oil passage. 3. The jack oil supply device for a large rotary machine according to claim 1, wherein said oil circulation system screws said circulation oil using a difference in oil pressure of lubrication oil generated in said lubrication oil supply device. A jack oil supply device for a large rotating machine, characterized in that the oil flows through a pump.