JP2009299525A - Hydraulic pressure generating device - Google Patents

Abstract

[PROBLEMS] To prevent deterioration of hydraulic oil suction performance and cavitation generation in the main hydraulic pump by draining hydraulic oil and accumulated air from the air vent hole of the main hydraulic pump and passing it through an oil purification system without human intervention. To do.
Hydraulic oil stored in an oil tank 1 is sucked into a main hydraulic pump 4 through an inlet pipe 2 to generate hydraulic pressure, which is supplied to a hydraulic operating section 6 and finished at the hydraulic operating section 6. And an oil purification system 11 provided with a circulation hydraulic pump 8 and an oil purifying filter device 9 via a circulation hydraulic pump inlet valve 10 in the oil tank 1. in hydraulic pressure generating device 100 was provided, the main vent air of the hydraulic pump 4 is provided to the reservoir tends site hole 4 _-1 and the air vent pipe 13 between the inlet of the circulation hydraulic pump 8 of the oil purification system 11 The hydraulic oil mixed with air from the main hydraulic pump 4 is sucked out by the circulating hydraulic pump 8 to release air.
[Selection] Figure 1

Description

  The present invention relates to a hydraulic pressure generator, and more particularly to a hydraulic pressure generator provided with means for removing air mixed in hydraulic oil.

  In nuclear power generation facilities and thermal power generation facilities, the amount of steam supplied to the steam turbine and the amount of fuel supplied to the gas turbine are controlled by controlling the valve opening of the steam valves and fuel valves. Since a large torque is required when driving the valve body, an actuator such as a cylinder or a hydraulic motor (hereinafter referred to as a hydraulic operation unit) is used as the valve body drive means. Pressurized hydraulic fluid is supplied.

  By the way, when a hydraulic operation unit such as a cylinder or a hydraulic motor is operating, it is inevitable that some air is mixed in the hydraulic oil, and the mixed air flows in the hydraulic circuit as bubbles. The bubbles are generally removed by an inlet filter installed at the front stage of the main hydraulic pump (see, for example, Patent Documents 1 and 2).

FIG. 3 is a configuration diagram of the hydraulic pressure generator 100 when the invention disclosed in Patent Documents 1 and 2 is put into practical use.
The hydraulic pressure generator 100 connects a main hydraulic pump 4 together with an inlet filter 3 to an inlet pipe 2 connected to an oil tank 1, and hydraulic fluid pressurized by the main hydraulic pump 4 is supplied through an oil supply pipe 5 as indicated by a solid line arrow. The hydraulic oil is supplied to the hydraulic operating section 6 of each hydraulic system, and the hydraulic oil that has worked in each hydraulic operating section 6 is returned to the oil tank 1 via the return pipe 7.

  Further, the hydraulic pressure generator 100 is provided with an oil purification system 11 for the purpose of cleaning the hydraulic oil stored in the oil tank 1. The oil purification system 11 includes a circulation hydraulic pump 8, an oil cleaning filter device 9, and a circulation hydraulic pump inlet valve 10, so that it is not necessary to supply hydraulic oil to the hydraulic operation unit 6 when the power generation equipment is stopped. When the oil tank 1 is filled with oil, the circulating hydraulic pump inlet valve 10 is fully opened, and the hydraulic oil is circulated through the oil purification system 11 as indicated by the broken line arrow, and is contained in the hydraulic oil. Impurities are removed by the oil cleaning filter device 9. The oil purification system 11 is configured to fully close the circulation hydraulic pump inlet valve 10 so that hydraulic oil does not circulate to the oil purification system 11 during operation of the main hydraulic pump 4.

When the main hydraulic pump 4 supplies hydraulic oil to the hydraulic operating unit 6, it is inevitable that air is mixed into the hydraulic oil in the hydraulic operating unit 6 of each system, so the oil tank 1 contains bubbles. The working oil is returned via the return pipe 7. Note that L ₁ and L ₂ of the oil tank 1 are oil levels when the main hydraulic pump 4 is operated and when the operation is stopped.

When the operation of the main hydraulic pump 4 is continued in a state where air bubbles are mixed in the hydraulic oil in this way, the air vent hole 3 provided in a portion where the air mixed in the oil of the inlet filter 3 or the main hydraulic pump 4 is likely to accumulate. air separated from the oil, respectively ₁ and 4 _-1 comes accumulated gradually. In particular, the main because inlet of the hydraulic pump 4 becomes negative pressure, the inlet filter 3 air vent hole 3 than the amount of air accumulated in _-1 main hydraulic pump 4 of the air vent hole 4 _-1 accumulated it is much amount of air Many.

In the main hydraulic pump 4, the coming increase the amount of air accumulated in the air vent hole 4 _-1, not only the suction performance is lowered, there is a possibility that cavitation. Further, the hydraulic oil may be deteriorated due to oxidation when the amount of air mixed in increases.

  In order to prevent the occurrence of these malfunctions, a fine air separation mesh (for example, a wire mesh) is provided in the middle of the flow path between the discharge port of the oil return pipe 7 inside the oil tank 1 and the suction port of the inlet pipe 2. ) 12 is installed to remove bubbles of a certain size, but it is difficult to sufficiently remove the air from the hydraulic oil with this air separation net 12 alone.

Therefore, sure to allow operation elapsed hydraulic generator 100 inlet filter 3 and the main vent air mixed in the oil of the hydraulic pump 4 is provided to the reservoir tends site 3 _-1 and _4-1 of screw-in conventional Remove the plug _{3 -2} and _{4 -2,} vent _{3 -1,} so that removing the air accumulated in the _4-1.
Japanese Utility Model Publication No. 6-34703 Japanese Utility Model Publication No. 7-30388

Thus, performing the inlet filter 3 and the main hydraulic pump 4 of the air vent hole 3 _-1 and _4-1 stopper 3 _-2 closes _the, mounting or removal of the 4 _-2 sure to allow operation elapsed hydraulic generator This operation has a drawback that it is extremely troublesome for the operator.

  In view of this, the present invention eliminates the operating oil and the accumulated air from the air vent hole of the main hydraulic pump without human intervention and causes the oil to flow into the oil purification system. It is an object of the present invention to provide a hydraulic pressure generator that can prevent the above-described problem.

  In order to achieve the above object, the invention according to claim 1 is directed to sucking hydraulic oil stored in an oil tank into a main hydraulic pump via an inlet pipe, generating hydraulic pressure and supplying the hydraulic pressure to the hydraulic operating section. The oil purifier is configured to return the working oil that has finished work in the working unit to the oil tank by a return pipe, and includes a circulation hydraulic pump, an oil purifying filter device, and a circulation hydraulic pump inlet valve in the oil tank. In the hydraulic pressure generator connected to the system, the air vent hole provided in the main hydraulic pump and the circulation hydraulic pump suction port are communicated with each other by an air vent pipe so that the hydraulic oil mixed with air from the main hydraulic pump It is characterized by being sucked out by a circulation hydraulic pump.

  According to the hydraulic pressure generator of the present invention, the air and air collected from the main hydraulic pump are connected by connecting the air vent hole of the main hydraulic pump and the suction port of the circulation hydraulic pump of the oil purification system through the air vent pipe. The mixed hydraulic oil can be extracted without human intervention, and the deterioration of the hydraulic oil suction performance and the occurrence of cavitation in the main hydraulic pump can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
It should be noted that parts and elements common to the drawings are denoted by the same reference numerals, and redundant description will be omitted as appropriate.

(First embodiment)
FIG. 1 is a block diagram showing a hydraulic pressure generator according to a first embodiment of the present invention.
(Constitution)
This embodiment, as shown in FIG. 1, the air vent hole 4 _-1 provided in entrained air tends to collect sites in the hydraulic oil in the main hydraulic pump 4 by a plug 4 _-2 as shown in FIG. 3 instead, connect one end of the air vent pipe 13 that is newly prepared in the vent 4 _-1, inlet of the circulating hydraulic pump 8 in the oil purifying system 11 and the other end, i.e. the circulating hydraulic pump 8 and the inlet valve to close 10 is connected to a pipe between the main hydraulic pump 4 and the hydraulic oil from the main hydraulic pump 4 during operation of the main hydraulic pump 4 while being supplied to the hydraulic operating section 6 of each hydraulic system. by operating the circulation hydraulic pump 8 in a state that closes the hydraulic pump inlet valve 10, together with the air that remains a part of the hydraulic fluid sucked into the main hydraulic pump 4, sucking the air vent hole 4 _-1, air vent Oil purification system via pipe 13 This is characterized in that it is sent to the base 11 and is further returned from the oil purification system 11 to the oil tank 1.

Wherein the amount of the hydraulic fluid is sucked out from the air vent hole 4 _-1 of the main hydraulic pump 4 by the circulating hydraulic pump 8, oil supplies main hydraulic pump 4 through the oil supply pipe 5 to the hydraulic unit 6 of the hydraulic system The amount of oil should be set so as not to affect the amount. Furthermore, the circulation hydraulic pump 8 itself employs a screw pump or the like so that cavitation is unlikely to occur even when hydraulic fluid mixed with bubbles is sucked.
Since the hydraulic pressure generating device 100 according to the present embodiment is the same as the prior art in FIG.

(Function)
Next, the operation of the hydraulic pressure generator 100 according to the present embodiment will be described.
In the present embodiment, while the main hydraulic pump 4 is stopped, the circulating hydraulic pump 8 is operated with the circulating hydraulic pump inlet valve 10 fully opened, as in the case of the prior art. The hydraulic oil is circulated, and the oil cleaning filter device 9 removes impurities such as moisture and metal particles contained in the hydraulic oil.

  On the other hand, when starting operation of the main hydraulic pump 4, the circulation hydraulic pump inlet valve 10 is closed, and the hydraulic oil in the oil tank 1 is kept from flowing into the oil purification system 11 by the circulation hydraulic pump 8. When the main hydraulic pump 4 is operated in this state, the hydraulic oil in the oil tank 1 is sucked into the main hydraulic pump 4 through the inlet filter 3 of the inlet pipe 2 and is pressurized and passed through the oil supply pipe 5. Oil is supplied to the hydraulic operating section 6 of the system.

  When the hydraulic oil is supplied to the hydraulic operating unit 6 to work, air is mixed in as bubbles. The hydraulic oil in a state where air bubbles are mixed is returned to the oil tank 1 through the return pipe 7, flows in the oil tank 1 toward the suction port of the inlet pipe 2, and the installation site of the air separation net 12 is in the middle. To. When the air bubbles gather to some extent and become larger than the air separation mesh 12, they are trapped by the air separation network 12 and float as indicated by an arrow (Air) and escape to the atmosphere.

However, fine bubbles than the eyes of the air separation network 12, enters the inlet pipe 2 with hydraulic oil through the air separating net 12, collects in the air vent hole 3 _-1 portion thereof is captured by the inlet filter 3 but since the inlet of the main hydraulic pump 4 as described above is a negative pressure, air bubbles largely than air vent hole 3 _-1 inlet filter 3, is sucked into the main hydraulic pump 4 to the oil accumulating in the air vent hole 4 _-1 air mixed is provided tends to collect site. The air collected in the air vent hole 4 _-1 of the main hydraulic pump 4, as the chain line arrow a point by the circulation hydraulic pump 8, an oil cleaning system 11 side through the air vent pipe 13 with hydraulic oil mixed bubble And is passed through the oil cleaning filter device 9 and returned to the oil tank 1 again. The enlarged bubbles are captured by the air separating net 12 and float along the air separating net 12 as indicated by an arrow (Air) to be separated from the hydraulic oil.
By repeatedly performing such an action during the operation of the main hydraulic pump 4, the air mixed in the hydraulic oil is effectively extracted and reduced.

(effect)
As described above, according to this embodiment, the configuration between the suction port of the circulation hydraulic pump 8 of the air vent hole 4 _-1 and the oil purification system 11 of the main hydraulic pump 4 so as to communicate with the air vent pipe 13 In addition, since the circulation hydraulic pump 8 is always operated regardless of whether the main hydraulic pump 4 is operated or stopped, the air accumulated in the upper portion of the main hydraulic pump 4 and the working oil mixed with air are manually operated. The air can be extracted by sucking without intervening.

  As a result, it is possible to prevent the suction performance from deteriorating due to air remaining in the suction port of the main hydraulic pump 4 and the occurrence of cavitation. Further, the deterioration of the hydraulic oil can be suppressed by reducing the amount of air contained in the hydraulic oil.

(Second Embodiment)
FIG. 2 is a block diagram showing a second embodiment of the hydraulic pressure generator according to the present invention.
(Constitution)
In this embodiment, an inlet filter and a hydraulic pump installed between the inlet pipe 2 and the oil feeding pipe 5 are provided in parallel for two systems, and one of them is, for example, a normal system and the other is a standby system. The air vent pipes connecting between the air vent holes provided in the hydraulic pump and the spare hydraulic pump and the oil purification system are also provided for two systems, the normal system and the spare system.
Other configurations are the same as those of the first embodiment of FIG. A device belonging to the standby system is displayed separately from the regular device by adding a suffix S to the reference numeral.

  In FIG. 2, a normal system inlet filter 3, a main hydraulic pump 4, and a check valve 14 connected in series from upstream to downstream are installed between an inlet pipe 2 and an oil feed pipe 5. A standby system in which the inlet filter 3S, the main hydraulic pump 4S, and the check valve 14S are similarly connected in series is connected in parallel to the normal system configured as described above.

  The check valves 14 and 14S operate when either the normal main hydraulic pump 4 or the standby main hydraulic pump 4S is operated to supply hydraulic oil to the hydraulic operation unit 6 when the main hydraulic pump 4 is stopped. It is provided for the purpose of preventing the hydraulic fluid from flowing backward on the (4S) side.

  In addition, orifices 15 and 15S are provided in the middle of the normal air vent pipe 13 and the standby air vent pipe 13S, respectively. The orifices 15 and 15S are calibrated so that air can always be vented from both systems even when one main hydraulic pump 4 (4S) is operated and the other main hydraulic pump 4S (4) is stopped. Yes.

(Function)
Next, the operation of this embodiment will be described.
In the hydraulic pressure generating device 100 of the present embodiment, when one of the main main hydraulic pump 4 or the standby main hydraulic pump 4S (for example, the standby main hydraulic pump 4S) is stopped. The suction inlet of the standby main hydraulic pump 4S that is stopped has a positive pressure, and the suction inlet of the operating main hydraulic pump 4 during operation has a negative pressure. At this time, if the other ends of the air vent pipes 13 and 13S whose one ends are respectively connected to the air vent holes 4 _-1 and 4S _-1 are simply connected in common, the standby system has a positive pressure at the suction port because of the stoppage. Only the main hydraulic pump 4S is vented through the air vent pipe 13S, and the working oil flows back into the air vent hole of the normal main hydraulic pump 4 where the suction port has a negative pressure because it is in operation. Air cannot be vented from the hydraulic pump 4.

  Therefore, in order to cope with this, in the present embodiment, the orifices 15 and 15S are respectively installed in the air vent pipes 13 and 13S, and the diameters of the orifices 15 and 15S are set so as to be in operation and stopped. Even if there is a differential pressure between the air vent hole of the main hydraulic pump during operation and the air vent hole of the main hydraulic pump that is stopped The operating oil containing air can be sucked out from the main hydraulic pump during operation.

  As described above, the orifices 15 and 15S are respectively installed in the air vent pipe 13 and the orifices are selected so that the backflow of the hydraulic oil does not occur. As a result, a plurality of pumps are stopped or operating. However, the air can always be removed from a plurality of locations.

(effect)
As described above, according to the present embodiment, in addition to the effects provided by the first embodiment, a plurality of hydraulic pumps are installed, and an orifice having an appropriate diameter is provided in the air vent hole of each hydraulic pump. Since the air vent pipe is connected, even when a plurality of pumps are stopped or operating, it is possible to perform air venting by always sucking out hydraulic oil mixed with air from a plurality of locations.

(Third embodiment)
In the first and second embodiments described above, the air vent pipe 13 (or 13S) is provided only in the air vent hole 4 _-1 (or 4S _-1 ) provided in a portion where the air of the main hydraulic pump 4 (or 4S) easily collects air. However, the present invention is not limited to this, and the air vent pipe is also connected to the air vent hole 3 _-1 (or 3S _-1 ) provided in the portion of the inlet filter 3 where the air is likely to accumulate. You may do it.

1 is a system diagram showing a hydraulic pressure generator according to a first embodiment of the present invention. The systematic diagram which shows the hydraulic-pressure generator by the 2nd Embodiment of this invention. The system diagram of the conventional oil pressure generator.

Explanation of symbols

1 ... oil tank, 2 ... inlet pipe, 3 ... inlet filter, 3 _{-1 ...} vent, _{3-2 ...} stopper, 4 ... main hydraulic pump, _{4-1 ...} vent, 4 _{-2 ...} plug, 5 ... refueling Pipes, 6 ... hydraulic actuator, 7 ... return pipe, 8 ... circulation hydraulic pump, 9 ... oil cleaning filter device, 10 ... circulation hydraulic pump inlet valve, 11 ... oil purification system, 12 ... air separation network, 13 , 13S ... Air vent piping, 14, 14S ... Check valve, 15, 15S ... Orifice.

Claims (7)

The hydraulic oil stored in the oil tank is sucked into the main hydraulic pump through the inlet pipe, and hydraulic pressure is generated and supplied to the hydraulic operating section. The hydraulic oil that has finished work in the hydraulic operating section is returned to the oil tank through the return pipe. In the oil pressure generator configured to return, and connected to the oil tank an oil purification system including a circulation hydraulic pump, an oil cleaning filter device and a circulation hydraulic pump inlet valve,
An air vent pipe communicates between an air vent hole provided in the main hydraulic pump and the circulation hydraulic pump suction port so that hydraulic fluid mixed with air is sucked out from the main hydraulic pump by the circulation hydraulic pump. A hydraulic pressure generator characterized by that.   The oil purification system opens the circulation hydraulic pump inlet valve while the main hydraulic pump is stopped, circulates the working oil stored in the oil tank by the circulation hydraulic pump, and cleans it. 2. The hydraulic pressure generator according to claim 1, wherein during operation, the circulating hydraulic pump inlet valve is closed and the circulating hydraulic pump sucks out hydraulic fluid mixed with air from the main hydraulic pump.   3. The hydraulic pressure generation according to claim 1 or 2, wherein an air vent hole provided in an inlet filter installed in series with the main hydraulic pump communicates with the oil circulation hydraulic pump suction port by an air vent pipe. apparatus.   A plurality of pipes in which the inlet filter and the main hydraulic pump are installed in series are installed in parallel, and an orifice is inserted in the middle of the air vent pipe connected to the air vent hole of each system main hydraulic pump. The hydraulic pressure generator according to any one of claims 1 to 3.   The hydraulic pressure generator according to any one of claims 1 to 3, wherein a backflow prevention valve is installed on a discharge port side of the plurality of main hydraulic pumps.   3. The hydraulic pressure generator according to claim 1, wherein the circulating hydraulic pump is a screw pump.   The air separation network for separating the air mixed in the hydraulic oil is further provided in a flow path between the outlet of the return pipe inside the oil tank and the inlet of the inlet pipe. The hydraulic pressure generator according to any one of 1 to 6.

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