JPS59190501A - Controller for pressure oil device - Google Patents

Abstract

PURPOSE:To prevent damage of apparatus and protect controlling electric parts by operating an extra pressure oil pump together with the normal-use pressure oil pump simultaneously, if the oil consumption has exceeded a certain value during operation of the normal-use pressure oil pump solely. CONSTITUTION:When a normal-use pressure oil pump 2a is in service while the main machine is being operated, the oil consumption is sensed through sensing of the frequence of unloading per unit time, which can be known from actuations of a micro-switch 8a mounted on an unloader for said pump 2a, wherein the oil consumption sensed exceeding the set value shall provide judgement of excessive consumption to request continuous operation of an extra pressure oil pump 2b, and when the pump 2a is restituted to normal operation resulting in lower oil consumption than the set value, the pump 2b shall be stopped. While the pump 2a is at a standstill, a pressure switch 10 of a pressure oil tank 9 will put the pump 2b in intermittent operation, and if frequency actuation of the unloader 5a causes the oil consumption exceeding the set value, the pump 2b is changed over to continuous operation.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to control and capping devices for pressure oil equipment, and particularly relates to regular pressure oil pumps and standby pressure oil pumps for hydroelectric power plants having water turbines and pump turbines. The present invention relates to a control device suitable for an inlet valve pressure oil device or a pressure oil device for opening and closing a guide vane.

[Prior art]

In recent years, the capacity of water turbine generators has tended to increase in size due to economic reasons, and the head of the water turbine has also tended to increase, so the operating force required to open and close the large mouth valve and guide vanes has increased. is increasing.

To deal with this, attempts have been made to increase the operating force by increasing the size of the opening/closing operation cylinder and related equipment, but this leads to an increase in the installation area9, so it is not desirable. I can't say that. Furthermore, underground power plants are common in pump turbines, and although efforts are being made to reduce construction costs by reducing the amount of excavation, an increase in the installation area is contrary to this objective.

For this reason, the current situation is that we have no choice but to rely on methods of increasing the pressure of operating pressure oil and downsizing the equipment.

By the way, the most important problem with increasing pressure in hydraulic equipment is maintaining reliability, since an accident in the hydraulic system will cause the control system of the equipment to lose all functions. , it is necessary to establish a sufficient operation control method. However, the current situation is that no effective operation control method for pressure oil pumps has been established.

The prior art will be explained below with reference to FIGS. 1 to 3. 1st
The figure is a system diagram of a pressure oil system, where the parts 1a to 8a are regular machines, the parts 1b to 8b are spare machines, 1a,
1b is an electric cherry blossom for pressure oil pump, 2a and 2b are regular pressure oil pump and standby pressure oil pump respectively, 3a and 3b are safety valves, 4
a, 4 (b is a strainer, 5.a, 5b is an unloader,
6a and 6b are check valves, 7a and 7b are pilot valves, and Ba and Bb are microswitches installed in the unloaders 5a and 5b, respectively. Also, 9 is a pressure oil tank,
10 is a pressure switch provided on the pressure cutter 9, 11 is a pressure oil pipe, and 12 (d) is an oil collecting tank.

Figure 2 shows the oil pressure and oil level (oil amount) in the pressure oil tank 9 shown in Figure 1.
FIG. The pressure inside the pressure oil tank 9 is the normal upper limit pressure P. When the pressure drops from to the normal upper limit pressure P1,
The pilot valve 7a is switched, the pressure oil is drained, the unloader 5a is switched by the spring, and the oil produced from the pressure oil pump 2a passes through the check valve 6a and the pressure oil pipe 11. The pressure oil tank 9 is replenished. Therefore, the pressure in the pressure oil tank 9 increases, and the pressure in the pressure oil tank 9 reaches P. When the pressure rises to 7, the pilot valve 7 is
a is switched, pressure oil O is switched to high lot valve 7a
'<Acts on the main valve of the vertical loader 5a and switches as shown in the figure against the spring, and the pressure oil from the pressure oil pump 2a is returned to the oil collection tank 12, and the pressure oil pump 2a
becomes unload operation.

In addition, when the pressure in the pressure oil tank 9 drops to P4 due to a failure of the regular pressure oil pump 2a or an increase in the amount of pressure oil consumed, the pressure cassette inch 10 operates to activate the standby pressure oil pump electric motor 16. Drive, pressure oil pump 2b, - unloader 5
b. Pressure oil is supplied to the pressure oil tank 9 by operating the high lot valve 7b.

The pressure inside the pressure oil tank 9 is P. When reaching this point, the pressure oil pump 2b is stopped by the action of the pressure switch 10.

A flowchart of these control operations is shown in FIG. Note that the solid line arrows in FIG. 3 are for the regular machine, and the broken line arrows are for the standby machine.

During normal operation of the water turbine, the on-load time Tom of the pressure oil pump 2a is as follows: QO+Ql; the pressure in the pressure oil tank 9 is P. Oil amount QP when sPl; Discharge oil amount of pressure oil pump 2a Also, unloading time TTIN is: Here, Q, oil leakage amount per minute, control oil amount, operation 7
It is indicated by the sum of Tayu. Therefore, the pressure oil pump 2a is operated on-road only n times per hour. When the load conditions on the water turbine change continuously, the amount of oil consumed from the pressure oil tank 9 increases and Q
, becomes large. ), the unloading time of the pressure oil pump 2a is shortened.

In particular, if the intermittent operation interval of the pressure oil pump 2b of the 4M machine is short, the preliminary pressure oil pump 2b will repeatedly start and stop in a short period of time. It is undesirable to cause damage to equipment and electrical appliances.

[Purpose of the invention]

The present invention has been made in view of the above, and its purpose is to be able to temporarily control a reserve pressure oil pump, which normally operates only as a standby machine, in the same manner as a regular pressure oil pump, thereby preventing equipment damage. It is an object of the present invention to provide a control device for a pressure oil system that can prevent the above problems and protect control electrical equipment.

[Summary of the invention]

The first feature of the present invention is that there is a detection means for detecting oil consumption exceeding a set amount of oil during operation of the regular pressure oil pump, and a detection means for detecting oil consumption exceeding a set amount of oil during operation of the regular pressure oil pump. The present invention is provided with a control means for controlling the pump to operate simultaneously with the pressure oil pump.

A second feature is that when the regular pressure oil pump is stopped and the backup pressure oil pump is intermittently operated by a pressure switch provided in the pressure oil tank, the second
a second detection means for detecting oil consumption exceeding the oil amount;
The present invention further includes a second control means for controlling the pre-biased oil pump to switch from intermittent operation to continuous operation based on the output of the detection means.

[Embodiments of the invention]

The present invention will be explained in detail below using the embodiment shown in FIG. 4 and FIG.

FIG. 4 is a flowchart showing one embodiment of the control operation of the control device for the pressure oil system of the present invention. The dash-dotted line arrows indicate the flow of control according to the present invention, which is different from the conventional one.

The hydraulic system is the same as that shown in FIG. 1, and in FIG. 4, the explanation of which will be omitted here, the following functions have been added to those in FIG. 3. In other words, (1) While the main engine (water turbine or water turbine pump) is operating,
While the regular pressure oil pump is in operation, the amount of oil consumed is detected by detecting the number of unloads per unit time than the number of operations of the microswitch Ba installed on the unloader 5a for the regular pressure oil pump 2a. If the number of unloads per unit time is greater than the preset number N, it is determined that the oil consumption is excessive, and the preliminary pressure oil pump 2b is operated continuously based on the judgment output, and the regular pressure oil is When the operation of the pump 2a returns to normal and the number of unloads becomes smaller than N, the preliminary pressure oil pump 2b is stopped and the operation of only the regular pressure oil pump 2a is resumed. Reference numeral 13 in FIG. 4 is an integrator for accumulating the number of operations of the micro switch 8a, and when the accumulated value is greater than N, an output is outputted.When the accumulated value is greater than N, an output is outputted.When it is smaller, an output is outputted.

(2) While the main engine is stopped, the standby oil pump 2b is activated by the operation of the pressure switch 10 as in the conventional case, and the pressure in the pressure oil tank 9 is set to P. (See Figure 2), the pilot valve 7b is switched, and when the unloader 5b is in the unload position, the microswitch 8b is activated and the pre-pressure oil pump 2b is stopped. If oil consumption is extremely high for some reason and the number of times the pre-pressure oil pump 2b is operated per unit time is greater than the preset number N, the unloader 5
The total number of operations of the microswitch 5b installed at point b is detected by the totalizer 14, and when the cumulative value becomes greater than N per unit time, the output is When the operation is stopped, the oil consumption returns to normal, the number of operations of the micro switch 5b is N or less, and the totalizer 14 starts outputting Y', the pre-pressure oil pump 2b is turned on again. The pressure switch 10 is used to return to operation.

As described above, according to the embodiment of the present invention, the backup pressure oil pump 2b, which has been kept on standby as a secondary standby unit, is controlled to operate continuously according to the operating status of the regular pressure oil pump 2a, which is a regular unit. In addition, when the production is stopped and the regular pressure oil pump 2a is stopped, the pressure switch 10 of the backup pressure oil pump 2b can be used to operate the backup pressure oil pump 2b continuously according to the intermittent operation status. This has the advantage of being able to prevent scratches and protect electrical equipment for control.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to temporarily control the reserve pressure oil pump, which normally operates only as a pre-04 machine, in the same way as the regular pressure oil pump, and to prevent damage to companion equipment and to control electric power. This has the effect of protecting the product.

[Brief explanation of drawings]

Figure 1 is a system diagram of a pressure oil system, Figure 2 is a diagram showing the relationship between the oil pressure and oil level in the pressure oil tank in Figure 1, and Figure 3 is a diagram showing the control operation of a conventional pressure oil system. FIG. 4 is a flowchart showing one embodiment of the control operation of the control amount of the pressure oil device of the present invention.

Claims (1)

[Scope of Claims] 1. In a control device for a pressure oil system equipped with a regular pressure oil pump and a standby pressure oil pump of a hydroelectric power plant having a water wheel or a pump water wheel, a control device that is set in advance during operation of the regular pressure oil pump. It is characterized by comprising a detection means for detecting oil consumption exceeding the oil amount, and a control means for controlling the preliminary pressure oil pump to operate simultaneously with the regular pressure oil pump based on the output of the detection means. Control device for pressure oil equipment. 2. The detection means according to claim 1, wherein the detection means is an integrator that totals the number of operations within a unit time of a microswitch installed in an unloader of a commercial machine mainly including the commercial pressure oil pump. Control device for pressure oil equipment. 3. In a control device for a pressure oil system equipped with a regular pressure oil pump and a standby pressure oil pump of a hydroelectric power plant having a water wheel or a pump water wheel, when the oil volume exceeds the amount of oil installed in advance during operation of the regular pressure oil pump, a first detection means for detecting consumption; a first control means for controlling the preliminary pressure oil pump to operate simultaneously with the regular pressure oil pump based on the output of the first detection means; a second detection means for detecting oil consumption exceeding a preset second oil amount when the pre-pressure oil pump is operated intermittently by a pressure switch provided in the pressure oil tank while the pump is stopped; and a second control means for controlling the preliminary pressure oil pump to switch from intermittent continuous operation to continuous operation based on the output of the second detection means. control device. 4. Claim 3, wherein the second detection means is an integrator that totals the number of operations per unit time of a microswitch installed in an unloader of a standby machine mainly consisting of the standby oil pump. A control device for the pressure oil device described above.