JP4218210B2 - Jack oil feeder for large rotating machinery - Google Patents

Description

[0001]
BACKGROUND 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, and heats the screw pump using lubricating oil before starting the operation of the large rotating machine. Concerning configuration to be enabled
[0002]
[Prior art]
Large-sized rotating machines such as power and industrial turbines and generators driven by turbines are configured on the assumption that lubricating oil is constantly supplied. A lubricating oil supply device for supplying oil is installed. In such a large rotating machine, a high-pressure jack (generally exceeding 10 times the lubricating oil pressure value) is used to support the large weight of the rotating part applied to the bearing at low speeds when starting and stopping. A jack oil supply device for supplying oil to the bearing is also provided. Then, this jack oil branches the lubricating oil supplied from the lubricating oil supply device, pressurizes it to a predetermined high pressure value with a screw pump (also called a screw pump) of the jack oil supplying device, and supplies it as jack oil. It is common. Below, the jack oil supply device for a large rotating machine of a conventional example will be described with reference to FIGS. 3 and 4 as a representative example when the large rotating machine is a turbine apparatus.
[0003]
Here, FIG. 3 is a piping system diagram of a main part showing a jack oil supply device for a large rotating machine of a conventional example together with a lubricating oil supply device, and FIG. 4 is a sectional view showing a variable throttle device of the lubricating oil supply device. It is. In FIG. 3, 9 is a lubricating oil supply device in one example for supplying lubricating oil 99 to a turbine device (not shown), and 7 is a conventional jack oil supplying 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, and a variable throttle device. 8. Oil purifiers 94, 94 for keeping the lubricating oil 99 clean, piping 95 for the lubricating oil 99, and supply piping 96 are provided.
[0004]
In the lubricating oil supply device 9, a refrigerant (such as water) (not shown) of the cooler 93 is not mixed into the lubricating oil 99 even when the cooler 93 is damaged, as is generally done in a turbine device. For this purpose, the discharge pressure value of the main oil pump 92 is set higher than the lubricating oil pressure value required by the turbine device. The variable throttle device 8 is installed to step down the 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 at the bearing portion of the turbine device. As shown in FIG. 4, the variable throttle device 8 in this case has a casing 81, a throttle body 84, a presser body 87, a fixing nut 88, and a lid body 89, and the lubricating oil 99 is sealed at important points. A seal body (O-ring) is provided.
[0005]
The casing 81 is formed with a through hole 82 through which the lubricating oil 99 flows (formed in a state orthogonal to the paper surface of FIG. 4), from the outer surface of the casing 81 to the through hole 82, and orthogonal to the through hole 82. The bottomed screw hole 83 is provided. The throttle body 84 is a throttle section 85 that is a cylindrical body having a male thread 851 that fits into the bottomed screw hole 83 formed on the outer peripheral portion, and an operating rod that is formed concentrically with the throttle section 85 at one end of the throttle section 85. Part 86. The operating rod portion 86 is a cylindrical body having a diameter smaller than that of the throttle portion 85, a male screw 861 is formed on the outer peripheral portion thereof, and an operating portion 862 (in this case, A slot for turning a minus screw) is formed. The lid 89 has a bottomed screw hole 891 that fits into the male screw 861.
[0006]
The adjustment of the diaphragm in the variable throttle device 8 is performed by operating the operating portion 862 to adjust the amount of insertion of the throttle portion 85 into the through-hole 82, and when the setting of the insertion amount is completed, the throttle portion 85 is fixed to the casing 81 with the fixing nut 88. In addition, the lid 89 is attached to complete the intrusion of dust and the like into the lubricating oil 99, and the process is completed. In FIG. 3, the lubricating oil 99 set to a desired lubricating oil pressure value is supplied from the respective supply pipes 96 to the bearings of the turbine apparatus through the pipes 95. The jack oil supply device 7 pressurizes 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, when the high pressure jack oil 79 is obtained from the lubricating oil 99, the high pressure oil without pressure pulsation can be obtained only by the pump device without installing a device for suppressing the pressure pulsation. 6 is adopted. The jack oil 79 is supplied from the supply pipes 72 to the bearings of the turbine device when the screw pump 6 is operated. 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 lubricant oil 99 and the jack oil 79 are supplied to the turbine device by the lubricant oil supply device 9 and the jack oil supply device 7 according to the following procedure.
[0008]
(1) First, the operation of the lubricating oil supply device 9 is started on the 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 normal temperature or higher). Lubricating oil 99 is circulated through the turbine device before the start of operation. However, the lubricating oil supply device 9 starts operation without supplying the refrigerant to the cooler 93. (2) In this state, the lubricating oil 99 is heated by the heat loss of the main oil pump 92, and the temperature of the lubricating oil 99 supplied to the turbine apparatus is a condition that allows the turbine apparatus to start operation (for example, the lubricating oil temperature Is raised to 45 ° C. or higher). (3) When the temperature of the lubricating oil 99 reaches a condition where the operation of the turbine device can be started, the screw pump 6 of the jack oil supply device 7 is operated as an operation on the turbine device immediately before the operation start, and the turbine device Jack oil 79 is supplied to the bearing. (4) Thus, the operation of the turbine apparatus is performed under the condition that the temperatures of the respective parts become the conditions under which the operation can be started and the lubricating oil 99 and the jack oil 79 having a predetermined temperature and pressure are supplied to the bearings and the like. Is started.
[0009]
[Problems to be solved by the invention]
The above-described jack oil supply device 7 according to the prior art can supply the jack oil 79 required by the turbine device. However, there is a problem described below, and the solution is desired. For example, in the case of a biaxial screw pump, the screw pump 6 used in the jack oil supply device 7 is a pair (two pieces) of cylinders having the same outer diameter with screws in opposite directions formed on the outer peripheral surface portion. The rotors are in a state in which screws are engaged with each other, and both ends thereof are supported by the casing and are disposed in the casing. The screw pump 6 is operated so that the pair of rotors rotate in the reverse direction to discharge high pressure oil without pressure pulsation. Thus, in order to obtain a high hydraulic pressure value, the mutual clearance between the screws of both rotors is set to a very narrow value.
[0010]
The screw pump 6 starts operation when the turbine device is started up (see (3) in the section of “Prior Art”), but the screw pump 6 that is still in the room temperature state is supplied with the lubrication. The oil 99 is heated by oil 99 (having a temperature of 45 ° C. or higher according to the item (2) in the section “Prior Art”), and each part thereof undergoes thermal expansion. However, a rotor having a relatively small heat capacity and having a screw and having a large heat receiving area from the lubricating oil 99 thermally expands faster than the casing.
[0011]
At this time, because the thermal expansion of the casing is slow, the distance between the centers of the pair of rotors is almost the same as that before the start of operation, and interference occurs between the screws of the rotor. The interference between the screws of the rotor not only causes damage to the screw pump 6, but also causes powdered metal foreign matter generated by the damage to flow into the jack oil 79 and flow out of the screw pump 6, and the bearings of the turbine device, etc. May cause damage. In order to cope with this, in the jack oil supply device 7 of the conventional example, it is essential to install the oil cleaning device 71 on the discharge side of the jack oil 79 of the screw pump 6.
[0012]
The present invention has been made in view of the above-described problems of the prior art, and an object of the invention is to provide a jack for a large rotating machine that enables heating of a screw pump using lubricating oil before the operation of the large rotating machine is started. It is to provide an oil supply device.
[0013]
[Means for Solving the Problems]
In the present invention, the aforementioned object is
1) In a jack oil supply device for a large rotating machine, the lubricating oil supplied from the lubricating oil supply device is branched and supplied to a bearing of the large rotating machine as a high-pressure jack oil via a screw pump.
An oil circulation system for forcibly flowing the lubricating oil through the screw pump as circulating oil when the screw pump is stopped during operation of the lubricating oil supply device, and the screw pump is heated by the circulating oil. Or
2) In the means described in item 1, the oil circulation system is configured to flow the circulating oil through a screw pump using a discharge pressure of a main oil pump of the lubricating oil supply device, or
3) In the means described in item 1, the oil circulation system is achieved by allowing the circulating oil to flow through a screw pump by utilizing a hydraulic pressure difference of the lubricating oil generated in the lubricating oil supply device. The
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described 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 rotating machinery and the lubricating oil supply device of one example shown in FIG. 3 and FIG. To do. In the drawings used for the following description, only representative symbols are shown for the symbols given in FIGS. FIG. 1 is a main 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 lubricating oil supply device. In FIG. 1, reference numeral 1 denotes a jack oil in which the oil circulation system 2 is added to the jack oil supply apparatus 7 according to the conventional example shown in FIG. 3 and the oil cleaning device 71 for the jack oil 79 is removed. It is a supply device.
[0015]
The oil circulation system 2 forcibly passes a part of the lubricating oil 99 as the circulating oil 19 using the discharge pressure of the main oil pump 92 when the operation of the lubricating oil supply device 9 is stopped. This is an oil system to be flowed. The oil circulation system 2 includes an electromagnetic valve 21 and a fixed throttle body 22 arranged in series with each other along the flow path of the circulating oil 19 and a jack on the discharge side of the screw pump 6. The piping for the circulating oil 19 is connected between the piping for the oil 79 and the lubricating oil tank 91. Thus, in the jack oil supply device 1, when the solenoid valve 21 is opened, the main oil pump 92 → cooler 93 → variable throttle device 8 → oil cleaning device 94 → screw pump 6 → solenoid valve 21 → fixed throttle body 22 → lubrication. An oil system that allows the circulating oil 19 to flow through the path of the oil tank 91 is formed.
[0016]
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 in operation and the screw pump 6 is stopped. The circulating flow rate of the circulating oil 19 is, for example, a flow rate sufficient to make the temperature of the screw pump 6 at the start of operation of the turbine device close to the temperature of the lubricating oil 99 at that time. The solenoid valve 21 is opened by a command device (not shown) so that the circulating oil 19 flows through the screw pump 6 when the lubricating oil supply device 9 is in operation and the screw pump 6 is stopped. 6 is closed at the timing of starting operation.
[0017]
Since the jack oil supply device 1 according to an example of the embodiment of the present invention shown in FIG. 1 is configured as described above, in the state where the lubricating oil supply device 9 is operating and the screw pump 6 is not operating, A circulating oil 19 having a flow rate passes through the screw pump 6. The lubricating oil 99 at this time is rising toward 45 ° C. or higher according to the item (2) in the section “Prior Art”. Accordingly, the screw pump 6 is heated by the circulating oil 19 having a temperature equivalent to that of 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, when the temperature of the lubricating oil 99 reaches a condition where the operation of the turbine device can be started and the jack oil 79 is supplied to the bearing of the turbine device (see item (3) in the section of “Prior Art” above). In the reference), the temperature of the screw pump 6 is substantially equal to the temperature of the jack oil 79. This is natural because the circulating oil 19 and the jack oil 79 are both based on the lubricating oil 99.
[0018]
Thus, in the jack oil supply device 1 according to the present invention, there is no interference problem between the screws of the rotor of the screw pump 6 at the start of the supply of the jack oil 79 to the bearings of the turbine device. 79 is not mixed with powdery metallic foreign matter. This is 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 more than the jack oil supply device 7 of the conventional example. The maintenance work becomes much easier. In addition, these advantages can be obtained without providing a device dedicated to heating.
[0019]
In the above description, the jack oil supply device 1 has opened the electromagnetic valve 21 in all cases where the lubricant oil supply device 9 is in operation and the screw pump 6 is not operating. However, when the screw pump 6 is maintained at a temperature of 45 ° C. or higher by the operation of the turbine device, for example, when the jack oil 79 is passed through the screw pump 6 while the screw pump 6 flows, If the interference does not occur, the solenoid valve 21 may not be opened even when the lubricating oil supply device 9 is in operation and the screw pump 6 is stopped. In addition, as at least a part of the piping for the circulating oil 19 connected to the lubricating oil tank 91, a return piping (not shown) provided in the lubricating oil supply device 9 (lubricating oil 99 supplied to the turbine device is supplied to the lubricating oil tank 91). Piping for returning) may be used.
[0020]
Next, a jack oil supply device for a large rotating machine according to a different example of the embodiment of the present invention will be described with reference to FIG. In the following description, the same parts as those of the jack oil supply device for a large rotating machine according to the present invention shown in FIG. FIG. 2 is a main piping system diagram showing a jack oil supply device for a large rotating machine according to a different example of the embodiment of the present invention together with a lubricating oil supply device. 2, reference numeral 3 denotes a jack oil supply apparatus 1 according to the present invention shown in FIG. 1, which changes the connection position of the piping through which the circulating oil 19 flows, and replaces the solenoid valve 21 with a check valve 41. It is a jack oil supply apparatus provided with the oil circulation system 4 made to use.
[0021]
In this case, the lubricating oil supply device 9 is different in the connection position of the variable throttle device 8 from the cases shown in FIGS. 1 and 3, but the function is the same, and the variable throttle device 8 will be described with reference to FIG. As described above, since the foreign matter is not generated, it is allowed to install the variable throttle device 8 at the end portion related to the flow of the lubricating oil 99. The oil circulation system 4 of the jack oil supply device 3 uses the lubricating oil 99 as a circulating oil 19 when the operation of the lubricating oil supply device 9 is stopped. This is an oil system forcibly flowing using the hydraulic pressure difference of the oil 99. The oil circulation system 4 includes a fixed throttle body 22 and a check valve 41 arranged in series with each other along the flow path of the circulating oil 19, and the lubricating oil of the variable throttle device 8. A connection between the inflow pipe 99 and the pipe of the jack oil 79 on the discharge side of the screw pump 6 is connected.
[0022]
As a result, when the screw pump 6 is stopped in the jack oil supply device 3, the lubricating oil 99 inflow side of the variable throttle device 8 → the fixed throttle body 22 → the check valve 41 → the screw pump 6 → the lubricating oil 99 of the variable throttle device 8. An oil system through which the circulating oil 19 flows is formed in the path on the outflow side. In this oil system, the pressure source for circulating the circulating oil 19 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 cleaning device 94 in which the fluid resistance value varies depending on the amount of foreign matter or the like, the circulating oil 19 is supplied. 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 screw pump 6 is stopped and 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. However, when the discharge pressure value is higher than the pressure value on the inflow side of the lubricating oil 99 of the variable throttle device 8, the circulation of the circulating oil 19 is blocked by the function of the check valve 41.
[0023]
Since the jack oil supply device 3 according to a different example of the embodiment of the present invention shown in FIG. 2 has the above-described configuration, in the state where the lubricating oil supply device 9 is operating and the screw pump 6 is not operating, As in the case of the jack oil supply device 1, the circulating oil 19 is passed through the screw pump 6. Accordingly, it is possible to prevent the occurrence of 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 dedicated heating device. It is also possible to prevent contamination of powdery foreign metal. 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 for switching the supply / stop of the circulating oil 19 to the screw pump 6. A relatively inexpensive check valve 41 can be used in place of the electromagnetic valve 21.
[0024]
As a result, the manufacturing cost of the jack oil supply device is reduced, and the device for commanding the operation of the solenoid valve 21 is not necessary, thereby reducing the manufacturing cost accordingly. In the above description with reference to FIG. 2, the jack oil supply device 3 of the present invention uses the check valve 41 for switching between supply / stop of the circulating oil 19 to the screw pump 6, but the present invention is limited to this. For example, when the screw pump 6 is maintained at an appropriate temperature (for example, 45 ° C. or more) by the operation of the turbine device, the solenoid valve 21 may be provided instead of the check valve 41. Thus, in this case, when the lubricating oil supply device 9 is in operation and the screw pump 6 has stopped operating and is about to stop the turbine device, the jack oil supply device 1 of the present invention is used. Similarly to the above, the solenoid valve 21 can be operated so as not to open.
[0025]
【The invention's effect】
In the jack oil supply device for a large rotating machine according to the present invention, the following effects can be obtained by adopting the configuration described in the section for solving the above-mentioned problems.
(1) By adopting the configuration according to the items (1) and (2) of the means for solving the above-mentioned problems, the lubricating oil supply device 9 is in operation and the lubrication is performed when the operation of the screw pump 6 is stopped. Circulating oil 19 that branches off a part of oil 99 is passed through screw pump 6 using the discharge pressure of main oil pump 6, and the temperature of lubricating oil 99 (similar to jack oil 79) is set in screw pump 6. It becomes possible to heat to almost the same value. As a result, the problem of interference with the rotor of the screw pump 6 at the start of the supply of the jack oil 79 can be solved, and installation of an oil cleaning device for cleaning the jack oil 79 discharged from the screw pump 6 is unnecessary. It becomes possible to. Also,
(2) By adopting the configuration according to the item (3) of the means for solving the problems, the screw pump 6 of the circulating oil 19 when the lubricating oil supply device 9 is in operation and the screw pump 6 is stopped. It is possible to perform the flow to the position using the hydraulic pressure difference of the lubricating oil 99 generated in the lubricating oil supply device 9. This makes it possible to simplify the configuration of the flow path of the circulating oil 19 to the screw pump 6 while maintaining the effect of the item (1) as it is.
[Brief description of the drawings]
FIG. 1 is a piping system diagram of a main part showing a jack oil supply device for a large rotating machine according to an example of an embodiment of the present invention together with a lubricating oil supply device. FIG. 2 is a diagram according to a different example of an embodiment of the present invention. Fig. 3 is a piping system diagram of a main portion showing a jack oil supply device for a large rotating machine together with a lubricating oil supply device. Fig. 3 is a diagram of a main portion showing a jack oil supply device for a large rotating machinery of a conventional example together with a lubricating oil supply device. Piping system diagram [Fig. 4] Cross-sectional view of the variable throttle device of the lubricating oil supply device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jack oil supply apparatus 19 Circulating oil 2 Oil circulation system 21 Solenoid valve 22 Fixed throttle body 6 Screw pump 79 Jack oil 9 Lubricating oil supply apparatus 91 Lubricating oil tank 92 Main oil pump 99 Lubricating oil

Claims (3)

In a jack oil supply device for a large rotating machine, the lubricating oil supplied from the lubricating oil supply device is branched and supplied to a bearing of the large rotating machine as a high-pressure jack oil via a screw pump.
An oil circulation system for forcibly flowing the lubricating oil through the screw pump as circulating oil when the screw pump is stopped during operation of the lubricating oil supply device, and the screw pump is heated by the circulating oil. A jack oil supply device for large rotating machines. 2. The jack oil supply device for a large rotating machine according to claim 1, wherein the oil circulation system causes the circulating oil to flow through a screw pump using a discharge pressure of a main oil pump of the lubricating oil supply device. A jack oil supply device for a large rotating machine, characterized in that 2. The jack oil supply device for a large rotating machine according to claim 1, wherein the oil circulation system allows the circulating oil to flow through a screw pump by utilizing a hydraulic pressure difference of the lubricating oil generated in the lubricating oil supply device. A jack oil supply device for a large-sized rotating machine, characterized in that it is configured as described above.

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