JP2002048055A - Pressure pulse lowering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the pressure pulse generated from a hydraulic pump with the simple structure without having a complicated mechanism so as to reduce the vibration and the noise. SOLUTION: In a pressure pulse lowering device for lowering the pressure pulse by working the reverse pressure pulse wave having an opposite phase in relation to the pressure pulse wave of the operating fluid discharged from a hydraulic pump to this pressure pulse wave, an output shaft of a driving source for driving the hydraulic pump for rotation is provided with a restricting hydraulic pump in series to the hydraulic pump for the synchronous rotation with an opposite phase of the pressure pulse wave in relation to the hydraulic pump so that the operating fluid having the reverse pressure pulse wave with the opposite phase in relation to the pressure pulse wave generated by the hydraulic pump is discharged by the restricting hydraulic pump. Mixing of the operating fluid discharged from the hydraulic pump and the restricting hydraulic pump is prevented by the interposition of a bulkhead between them, and the only pressure by the pressure pulse and the reverse pressure pulse are transmitted each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pulsation generated by a hydraulic pump when a hydraulic motor or the like is operated in a device using a hydraulic pump, for example, a hydraulic propulsion device or other hydraulic drive device mounted on a ship. The present invention relates to a pressure pulsation reduction device for suppressing pressure pulsation.

[0002]

2. Description of the Related Art For example, as a propulsion device used for a ship, a hydraulic pump is interlocked to an engine as a main engine.
There is a type in which a hydraulic motor is rotated and driven by hydraulic pressure of hydraulic oil generated by the hydraulic pump to obtain a propulsive force. In a device using such a hydraulic pressure, in a configuration using a hydraulic pump,
The pressure of the hydraulic oil discharged from the hydraulic pump is pulsating. The pulsation of the hydraulic pressure generated from such a hydraulic pump is one of the causes of operating noise and vibration in a hydraulic device. To reduce such pressure pulsation, various pulsation reduction devices have conventionally been proposed. Has been issued.

As this pulsation reducing device, a device for actively reducing pressure pulsation is generally used. For example, for a hydraulic oil discharged from a hydraulic pump, a phase reverse to the pressure pulsation wave of the hydraulic oil is inverted. A device for reducing the original pressure pulsation by applying a pressure pulsation wave, for example, a device disclosed in Japanese Utility Model Laid-Open No. 6-1780, and has a structure in which a pressure pulsation wave of hydraulic oil discharged from a hydraulic pump is provided. A sensor for detecting components such as the frequency and amplitude of the pressure pulsation is provided, and a pressure pulsation wave from the hydraulic pump is canceled by generating a reverse pressure pulsation wave having a phase opposite to that of the pressure pulsation wave.

[0004] In some cases, an accumulator is attached to a pipe connected to the discharge side of a hydraulic pump to reduce pressure pulsation.

[0005]

However, the above-mentioned conventional pulsation reducing device requires a device for generating a reverse pressure pulsation wave which is separate from a hydraulic device including a hydraulic pump. There is a drawback that the size of the entire apparatus cannot be avoided and the structure of the entire apparatus becomes complicated. In addition, this device is configured to include a sensor for detecting the pressure pulsation wave of the hydraulic pump. After the detection by this sensor, the calculation is performed, and the result is used to control the pulsation reduction device to control the reverse pressure pulsation wave. Therefore, if the rotational speed of the hydraulic pump constantly changes, it may not be possible to sufficiently follow the generation of the reversal pressure pulsation wave, and in such a case, the pulsation of the pressure may be reduced. There is a risk of damage to devices such as a hydraulic motor connected to the hydraulic pump.

In the latter method using an accumulator for reducing pressure pulsation, one accumulator is required for each hydraulic system, and the pressure of gas or the like sealed in the accumulator is periodically inspected. However, there is a drawback that management for maintaining the pressure is required, and the maintenance is complicated.

[0007] In order to solve the above problems, the present invention can reduce the pressure pulsation generated by the hydraulic pump with a simple structure without a complicated mechanism, and reduce vibration and noise. It is an object of the present invention to provide a pressure pulsation reducing device that can perform the above-described operation.

[0008]

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The pressure pulsation reducing device according to claim 1 of the present invention is configured such that an inversion pressure pulsation wave having a phase opposite to that of the pressure pulsation wave acts on a pressure pulsation wave of hydraulic oil discharged from a hydraulic pump. In a pressure pulsation reduction device for reducing a pressure pulsation wave, a suppression hydraulic pump driven in synchronization with the hydraulic pump is provided, and the suppression hydraulic pump has an inverted pressure pulsation wave having an opposite phase to a pressure pulsation wave generated by the hydraulic pump. It is characterized in that the hydraulic oil is discharged.

According to a second aspect of the present invention, there is provided a pressure pulsation reducing device, wherein a reverse pulsation wave having a phase opposite to that of the pressure pulsation wave acts on a pressure pulsation wave of hydraulic oil discharged from a hydraulic pump. In a pressure pulsation reducing device for reducing a pressure pulsation wave, an output shaft of a drive source for rotationally driving the hydraulic pump is provided in series with the hydraulic pump and provided on the output shaft to synchronously rotate and drive the hydraulic pump. Hydraulic oil which is provided with a suppression hydraulic pump provided so that the phase difference between the pressure pulsation wave with the pump is in the opposite phase, and the pressure pulsation wave generated by the hydraulic pump is an inverted pressure pulsation wave having the opposite phase to the pressure oil,
It is characterized by being discharged from the suppression hydraulic pump.

According to a third aspect of the present invention, there is provided a pressure pulsation reducing apparatus according to the first or second aspect, wherein the hydraulic oil discharged from the hydraulic pump and the suppression hydraulic pump are mixed with each other. Instead, only the pressure due to the pressure pulsation wave and the reverse pressure pulsation wave are transmitted to each other.

According to a fourth aspect of the present invention, there is provided a pressure pulsation reducing apparatus according to the third aspect, wherein each of the hydraulic pump and the suppression hydraulic pump has a discharge side pipe, and each discharge side pipe has It is characterized by being connected via a flexible partition wall.

According to a fifth aspect of the present invention, there is provided a pressure pulsation reducing apparatus according to the third aspect, wherein each of the hydraulic pump and the suppression hydraulic pump has a discharge side pipe, and each discharge side pipe has: It is characterized by being connected via a movable partition.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic side view of a marine propulsion device provided with a pressure pulsation reducing device according to the present invention, and FIG. 2 is an enlarged schematic view of a main part of the pressure pulsation reducing device.

The pressure pulsation reducing device of the present invention is provided in a propulsion device of a ship or the like. The propulsion device 1 includes a main engine 2 such as a diesel engine as a drive source, a hydraulic pump 3 interlocked with the main engine 2, and a hydraulic motor 5 driven by hydraulic oil discharged from the hydraulic pump 3.
And a propeller 7 connected to the hydraulic motor 5 and rotating.
It is roughly composed of In the present embodiment, hydraulic motors 5 and 6 are disposed on the starboard and port sides of the hull, respectively.
Each hydraulic motor 5, 6 is provided with a propeller 7, 8 for propulsion. Further, the pressure pulsation reduction device 10 is substantially constituted by the suppression hydraulic pump 4 and the connection pipe 9.

As shown in FIG. 1, a rotary hydraulic pump 3 is connected to an output shaft (not shown) of the main engine 2 in an interlocking manner.
The drive of the main engine 2 drives the hydraulic pump 3 to rotate, and sends hydraulic oil to the one hydraulic motor 5 at a predetermined pressure through one pressure pipe 11 connected to the discharge port.

The suppression hydraulic pump 4 constituting the pressure pulsation reduction device 10 is arranged in series with the hydraulic pump 3 on the output shaft of the main engine 2 connected to the hydraulic pump 3, that is, in a tandem arrangement. Provided.

The restraining hydraulic pump 4 is a rotary pump having the same performance as the hydraulic pump 3, and is driven to rotate synchronously with the hydraulic pump 3 by the drive of the main engine 2. The phase difference of the pulsating wave is set to be opposite to that of the pulsating wave, and the hydraulic oil is sent to the other hydraulic motor 6 at a predetermined pressure to the other pressure pipe 12 connected to the discharge port.

The hydraulic pump 3 and the restraining hydraulic pump 4
Return pipes 14 and 15 connected to the outlets of the hydraulic motors 5 and 6 are connected to the respective suction ports.
Each pump 3, 4 and each hydraulic motor 5, 6, and each pipe 1
1, 12, 14 and 15 constitute a closed hydraulic circuit.

The hydraulic pump 3 and the restraining hydraulic pump 4 are constituted by, for example, a swash plate type rotary piston pump. As shown in FIG. 2, this swash plate type rotary piston pump is provided with a drive shaft 19 which is interlocked with the main engine 2.
Swash plate 20, a plurality of pistons 21, and a plurality of cylinders 21
and a cylinder block 22 provided with a.

A through hole 23 is formed in the center of the cylinder block 22, and a spline portion 24 is formed in the middle of the through hole 23. The spline portion 24 is fitted to a spline 24 a formed in the middle of the drive shaft 19, becomes substantially integral with the drive shaft 19, and the cylinder block 22 rotates together with the drive shaft 19. In the cylinder block 22, a plurality of cylinders 21a whose axes are in the same direction substantially parallel to the axis of the through hole 23 are provided.
3 are arranged at equal intervals from each other. In the present embodiment, it is composed of nine cylinders 21a.

Further, the swash plate 20 does not rotate with the drive shaft 19, but is swingable with respect to the drive shaft 19 so as to be set at an arbitrary inclination angle. On the swash plate 20,
A plurality of pistons 21 corresponding to the cylinder 21a, in this embodiment, nine bases of the pistons 21 are rotatably and swingably connected to each other. Each piston 21
Is inserted into each cylinder 21a and slidable at a predetermined stroke. The stroke of the piston 21 can be changed by changing the inclination angle of the swash plate 20. Further, the swash plate 20 is the cylinder block 2
The position closest to 2 (the upper part in FIG. 2) is the top P of the swash plate 20 and is the top dead center of the piston 21, and the cylinder 21a side corresponding to that position is the discharge port 26 as a pump. The suction port 27 is located at the farthest position.
The discharge port 26 and the suction port 27 are respectively provided on the valve plate 25 that does not rotate with respect to the cylinder block 22 that rotates with the drive shaft 19.

In order to apply this rotary piston pump as the hydraulic pump 3 and the suppression hydraulic pump 4,
The pressure pulsation waves are arranged so that the phase difference between them is opposite.

That is, as shown in FIGS. 3A and 3B, the relative positions of the top dead centers are set to shift the position of the top P of the swash plate 20 of each pump. With respect to the top portion P of the swash plate 20 of the hydraulic pump 3 (see FIG. 3A), the cylinders 21a, 21a
The setting is performed so that the top P of the swash plate 20 of the suppression hydraulic pump 4 is located at a position shifted by θ / 2 which is a half of the angle θ between 1a (see FIG. 3B). In other words, in a state where the positions of the pistons 21 of the pumps 3 and 4 are substantially coaxial with each other and are arranged with respect to the drive shaft 19, the cylinder block 22 of the hydraulic pump 3 is
Of the cylinder block 22 is set so as to rotate with a delay of θ / 2 °.

In this embodiment, the hydraulic pump 3
In addition, the swash plate type rotary piston pump constituting the suppression hydraulic pump 4 comprises nine sets of the piston 21 and the cylinder 21a constituting each pump, but the number of combinations of the piston 21 and the cylinder 21a is as follows. However, the present invention is not limited to this.

A pressure pulsation reducing device 10 is formed in the pressure pipes 11 and 12 of the hydraulic pump 3 and the suppression hydraulic pump 4 at a halfway portion near each discharge port so as to connect the two pipes 11 and 12. A connecting pipe section 9 is provided.

As shown in FIG. 4, the connecting pipe section 9 has a larger diameter than the pipes 11 and 12 connected to the pumps 3 and 4, and is movable inside the pipe in the pipe axis direction. A piston-like partition 13 is provided, and constitutes a so-called piston-type accumulator. The partition wall 13 does not mix the hydraulic oils flowing from the two pipes 11 and 12, that is, partitions the inside of the pipe into two spaces and moves in the axial direction of the pipes, so that the pressure of both hydraulic oils, Only the pressure due to the pressure pulsation waves generated by the hydraulic pumps 3 and 4 is transmitted from one side to the other side.

As shown in FIG. 1, the output shaft of the main engine 2 is connected to the hydraulic pump 3 and the suppression hydraulic pump 4 in an interlocked manner, and a charge pump 17 is also connected to the output shaft. And, it is connected to each return pipe 14, 15 on each suction port side of the suppression hydraulic pump 4, so that replenishment of hydraulic oil is performed.

Therefore, according to the pressure pulsation reducing device 10 configured as described above, when the main engine 2 is operated to drive the hydraulic pump 3 and the suppression hydraulic pump 4, the respective pressure pulsation waves are simultaneously rotationally driven in opposite phases. Therefore, the pressure pulsation waves generated when the hydraulic oil is delivered by the driving of the pumps 3 and 4 are sent to the respective hydraulic motors 5 and 6 in opposite phases to operate the hydraulic motors 5 and 6. .

The discharge pumps 11 and 12 of the hydraulic pump 3 and the suppression hydraulic pump 4 are connected by a connecting pipe 9 having a partition wall 13, so that the hydraulic pump 3 generates the hydraulic pump 3. The pressure pulsation wave and the reverse pressure pulsation wave of the opposite phase generated from the suppression hydraulic pump 4 move the partition wall 13 with each other, whereby both pulsation waves interfere with each other and cancel each other. From this, the pulsation of the hydraulic pressure of the working oil sent to each of the hydraulic motors 5 and 6 is substantially eliminated, and the noise and vibration during the operation of the propulsion device 1 described above are reduced.

As described above, since the vibration and noise are reduced, the hydraulic motors 5, 6 and the pressure pipes 11, 1
Thus, it is possible to reduce the number of support members for absorbing vibration in the fixed portion such as the second portion.

Further, in the above-described embodiment, for example, when the hull in the propulsion operation receives transverse waves when used as a propulsion device for a ship, one of the hydraulic motors 5 and 6 on both the left and right sides is used. Even when the propeller on one side rises above the water surface and its rotational load is lightened, the flow of hydraulic oil of both hydraulic pumps 3 and 4 is independent of the hydraulic motor 6, the hydraulic oil does not flow to the lightly-loaded hydraulic motor, thereby preventing over-rotation of the hydraulic motor and preventing damage to the hydraulic motor. Become.
That is, since the amounts of oil supplied to the hydraulic motors 5 and 6 are separated from each other by the partition 13 of the connecting pipe portion 9, they do not affect each other, and are not short or excessive. The motor does not rotate abnormally.

Further, unlike the conventional pulsation reducing device, the pressure pulsation is reduced by utilizing the pressure pulsation of the hydraulic pumps 3 and 4 as the driving sources for operating the hydraulic motors 5 and 6 and the like. Therefore, even if the rotational speeds of the hydraulic pumps 3 and 4 fluctuate, the responsiveness to the fluctuations is extremely good, and no increase in pressure pulsation occurs.

Further, in the above-described embodiment, the hydraulic pump 3 and the suppressing hydraulic pump 4 are arranged in tandem on the output shaft of one main engine 2, and the hydraulic pump 3 and the suppressing hydraulic pump 4 are arranged. Since the pressure pulsation waves with the pressure pulsation wave 4 and the pressure pulsation wave with the pressure pulsation wave 4 are provided in opposite phases, the pressure pulsation is reduced with one power source, so that the structure is simple and the maintenance is easy. .

In the above-described embodiment, an example has been described in which the hydraulic pump 3 and the suppression hydraulic pump 4 are provided in series on the output shaft of one main engine 2 as a drive source. The 3 and the suppression hydraulic pump 4 may be configured to be respectively connected to drive sources having different configurations.

In the above-described embodiment, the hydraulic pumps 5 and 6 are connected to the hydraulic pump 3 and the suppression hydraulic pump 4, respectively.
Are described, the hydraulic pump 3 and the suppression hydraulic pump 4 may be configured to drive one hydraulic motor. In this case, a hydraulic motor is connected to the main hydraulic pump via a pressure pipe, and a suppression hydraulic pump having the same performance as the hydraulic pump is provided in a tandem arrangement or the like, and the discharge-side piping of the suppression hydraulic pump is A branch connection is made to the pressure pipe, and a connection pipe is connected between the connection portion and each of the discharge ports.

Further, in the above-described embodiment, the connecting pipe portion 9 constituting the pressure pulsation reducing device 10 has been described as having the partition wall 13 movable inside the piston-shaped pipe. As a flexible partition, a so-called diaphragm may be used, that is, the connecting pipe portion 9 may be configured as an accumulator having a diaphragm, and a bladder 16 as a flexible partition as shown in FIG. A bladder type accumulator may be applied.

Further, in the above-described embodiment, an example has been described in which the hydraulic pump 3 and the suppression hydraulic pump 4 are constituted by swash plate type rotary piston pumps.
The configuration 4 is not limited to this, but may be configured to use another type of hydraulic pump, for example, a gear pump or the like, and can adjust the pressure pulsation waves of the hydraulic pump and the suppression hydraulic pump to be in opposite phases. The type of the pump is not limited as long as it is a hydraulic pump.

Further, in the above-described embodiment, an example has been described in which the hydraulic pump 3 and the suppression hydraulic pump 4 are constituted by pumps having the same performance. However, the hydraulic pump 3 and the suppression hydraulic pump 4 are completely different. There is no limitation to configure and combine pumps having the same configuration. That is, pumps having different performances may be combined if the pressure pulsation waves emitted are in opposite phases and the amplitudes are substantially the same.

Further, in the above-described embodiment, the hydraulic circuit constituted by the hydraulic pump 3, the suppressing hydraulic pump 4, the two hydraulic motors 5, 6 and the connecting pipe section 9 is constituted by a so-called closed hydraulic circuit. However, as shown in FIG. 6, a switching valve 18 may be provided to form an open hydraulic circuit. Also in the case of the example constituted by the open hydraulic circuit, similarly to the example constituted by the closed hydraulic circuit, the pipes 11 and 12 to both the hydraulic motors 5 and 6 are made to have the same hydraulic resistance. , 14 and 15 are desirably determined. A throttle valve (not shown) is provided in the middle of the piping from the hydraulic pumps 3 and 4 to the hydraulic motors 5 and 6 so that the hydraulic resistances are the same. It may be configured so that it can be adjusted so that In this case, the position of the throttle valve is preferably a position closer to the hydraulic motor than the connecting pipe portion 9.

In the above-described embodiment, an example in which the present invention is applied to the propulsion device 1 for a ship has been described. However, the pressure pulsation reduction device 10 of the present invention is not limited to this, and other pulsations may occur. Can be used for the device,
An effect similar to the above can be obtained.

[0041]

As described above, the pressure pulsation reducing device according to the present invention is provided with the suppression hydraulic pump that is driven in synchronization with the hydraulic pump, and the suppression hydraulic pump is opposite to the pressure pulsation wave generated by the hydraulic pump. Since the hydraulic oil that generates the phase inversion pressure pulsation wave is discharged, the pressure pulsation wave generated from the hydraulic pump and the inversion pressure pulsation wave generated from the suppression hydraulic pump have opposite phases and thus interfere with each other and cancel each other. Therefore, the pressure pulsation generated from the hydraulic pump is reduced, and the vibration and noise due to the pressure pulsation during the operation of the hydraulic pump are reduced.

Since these vibrations and noises can be reduced, it is possible to reduce the number of members for absorbing vibrations and the like provided in hydraulic equipment such as a hydraulic pipe connected to a hydraulic pump and a hydraulic motor to which pressure is supplied. Becomes

Further, the pressure pulsation can be reduced with a simple structure by providing the hydraulic pump and the suppression hydraulic pump in series with the output shaft of the drive source so that the respective pressure pulsation waves have opposite phases. In other words, it is possible to obtain a device that does not require a conventional structure such as a sensor or a structure that actively reduces pressure pulsation, thereby making it possible to reduce the size of the entire device and to increase the complexity. No maintenance is required.

Further, since the reverse pressure pulsation wave generated by the suppressing hydraulic pump is transmitted to the hydraulic pump by the component of the pressure to reduce the pulsation, the hydraulic oil of both pumps is not mixed. For example, in the case of a device configuration using two systems of hydraulic motors, if one is configured as a hydraulic pump and the other is configured as a suppression hydraulic pump, each operating system can be controlled independently and the other suppression hydraulic pump can be controlled. Can reduce the pressure pulsation.

Further, according to the pressure pulsation reducing device of the present invention, unlike the conventional pulsation reducing device, the pressure pulsation of a hydraulic pump as a drive source for operating a hydraulic motor or the like is utilized to reduce the pressure pulsation. Since it is a device that performs the operation, even if the rotation speed of the hydraulic pump fluctuates, the response to the fluctuation is very good, and the hydraulic motor to which the pressure is supplied does not cause an increase in pressure pulsation. It does not cause runaway or breakage of hydraulic equipment such as. .

[Brief description of the drawings]

FIG. 1 is a schematic side view of a propulsion device including a pressure pulsation reducing device showing an embodiment according to the present invention.

FIG. 2 is a side sectional view showing an example of a hydraulic pump and a suppression hydraulic pump used in the embodiment.

3 (a) is a schematic diagram of a hydraulic pump as viewed in the direction of arrows AA in FIG. 2; (b) is a schematic diagram of a suppressing hydraulic pump as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is an enlarged schematic view of a main part of the pressure pulsation reducing device.

FIG. 5 is an enlarged schematic view of a main part of a pressure pulsation reduction device according to another embodiment.

FIG. 6 is a schematic side view of a propulsion device including a pressure pulsation reduction device according to another embodiment.

[Explanation of symbols]

 2. Drive source (main engine) 3. Hydraulic pump 4. Suppression hydraulic pump 10. Pressure pulsation reduction device 13. Partition wall 16. Partition wall (bladder)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Maruyama 4- 3776 Irifunecho, Niigata City, Niigata Pref. Niigata Ironworks Niigata Shipbuilding Factory (72) Inventor Seiichi Hoshino 5-1 Higashinakakanuki, Tsuchiura City, Ibaraki Prefecture Uchida F-term (reference) in Tsuchiura Works of Hydraulic Equipment Co., Ltd. CC30 CC34 CC35 CC36 CC37 DA11 DA17 DA18 DA22

Claims (5)

[Claims] 1. A pressure pulsation reduction device for reducing a pressure pulsation wave by applying a reverse pressure pulsation wave having a phase opposite to that of the pressure pulsation wave to a pressure pulsation wave of hydraulic oil discharged from a hydraulic pump. A suppression hydraulic pump that is driven in synchronization with the hydraulic pump, wherein the suppression hydraulic pump discharges hydraulic oil that is a reverse pressure pulsation wave having a phase opposite to that of a pressure pulsation wave generated by the hydraulic pump. Pressure pulsation reducing device. 2. A pressure pulsation reduction device for reducing a pressure pulsation wave by applying an inversion pressure pulsation wave having a phase opposite to that of the pressure pulsation wave to a pressure pulsation wave of hydraulic oil discharged from a hydraulic pump. An output shaft of a drive source that rotationally drives the hydraulic pump is provided on the output shaft in series with the hydraulic pump, and is rotationally driven in synchronization with the output shaft. Pressure pulsation, comprising: a suppression hydraulic pump provided so as to be in phase, wherein hydraulic oil having a reversed pressure pulsation wave having a phase opposite to that of the pressure pulsation wave generated by the hydraulic pump is discharged from the suppression hydraulic pump. Reduction device. 3. The pressure pump according to claim 1, wherein the hydraulic oil discharged from the hydraulic pump and the hydraulic pump discharged from the suppression hydraulic pump do not mix with each other, and only the pressure generated by the pressure pulsation wave and the reverse pressure pulsation wave are transmitted to each other. Claim 1 or 2
The pressure pulsation reduction device as described in the above. 4. The hydraulic pump and the suppression hydraulic pump each include a discharge side pipe, and each discharge side pipe is connected via a flexible partition. Pressure pulsation reduction device. 5. The pressure according to claim 3, wherein each of the hydraulic pump and the suppression hydraulic pump includes a discharge side pipe, and each discharge side pipe is connected via a movable partition. Pulsation reduction device.