KR20030085608A - Oil pressure pulsation attenuator, pressure accumulator, gas supply - Google Patents

Abstract

PURPOSE: A hydraulic pulsation damper, an accumulator, and a gas supplying device are provided to prevent the leakage of oil and to improve durability. CONSTITUTION: In a hydraulic pulsation damper, a body(20) has a space therein. An opening(24) for pulsation damping gas is formed at the top of the body. An opening(29) for hydraulic fluid is formed at the bottom of the body. A separation plate(30) is slidably installed in the body, and separates the inside of the body into a pulsation damping gas chamber(100) and a hydraulic fluid chamber(200). A bellows(23) is installed between the inner surface of the body and the separation plate, and separates the pulsation damping gas from the hydraulic fluid. An opening/closing unit is detachably installed at the opening for the pulsation damping gas. A hydraulic fluid connecting passage(27) is formed perpendicular to the opening for the hydraulic fluid.

Description

OIL PRESSURE PULSATION ATTENUATOR, PRESSURE ACCUMULATOR, GAS SUPPLY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to hydraulic pulsation dampers, accumulators, and gas refuelers, and more particularly, hydraulic pulsation dampers used to damp hydraulic pulsations in hydraulic systems such as aircrafts, accumulators for accumulating hydraulic pressures, and It relates to a gas supply unit that can supply.

1 is a configuration diagram schematically illustrating a hydraulic system generally used in an aircraft or the like.

As shown, the hydraulic drive source is a pump 1 connected to and driven by a rotational shaft and a gear of the engine. The hydraulic fluid is delivered to the actuator 5 through a power package 3 composed of various filters, relief valves, ground equipment connections and sensors, and the pilot controls the actuator 5 via the controller 4. can do.

On the other hand, the fluid in the entire area of the hydraulic system has a pulsation (pulsation) by the interaction of the stiffness of the hydraulic system, which causes vibration and noise, causing discomfort, so that the pump (1) and the power package Between (3), it is common to install a hydraulic pulsation damper for damping the pulsation as described above.

In addition, in case the hydraulic system fails to operate normally due to a failure, an accumulator 6 for storing the fluid under pressure is installed, which basically takes the same structure as the hydraulic pulsation damper, The difference is that the control valve 7 is provided at the fluid inlet so that the stored fluid can be used only when necessary.

2 to 4 show the structure of a conventional hydraulic pulsation damper, Figure 2 is a cross-sectional view showing a piston type damper, Figure 3 is a cross-sectional view showing a bladder type damper, Figure 4 is a resonator type attenuator It is a cross-sectional view.

The piston-type attenuator shown in FIG. 2 is divided into the pulsation damping gas chamber 203 and the hydraulic working fluid chamber 204 by the piston 202 inside the body 201, and the pulsation pressure of the hydraulic working fluid is pulsation damping gas. It takes a structure that is canceled by the reciprocating motion of the piston that is elastically resisted by. However, it has been pointed out that internal leakage may occur through a gap between the piston 202 and the inner wall of the body 201.

The bladder type attenuator shown in FIG. 3 is separated into a pulsation damping gas chamber 303 and a hydraulically actuated fluid chamber 304 by a diaphragm 302 of an elastic material such as rubber inside the main body 301, and is operated hydraulically. The pulse pressure of the fluid is canceled by the elastic motion of the diaphragm 302 elastically resisted by the pulsation damping gas. This is advantageous in that there is no fear of mutual mixing of the hydraulic working fluid and the pulsation damping gas, but since the diaphragm 302 has to be formed by an elastic material, it cannot be formed of a durable material such as metal. It has been pointed out as a problem in terms of durability.

The resonator type attenuator shown in FIG. 4 does not have a separate structure inside the main body 401, and takes a structure that attenuates the pulse pressure of a specific frequency by a helmholtz attenuation effect. This is advantageous in terms of taking a simple structure, but has an attenuation effect only for the pulse pressure of a specific frequency, there is a problem that does not have an effect in the frequency region of the wide bandwidth.

Therefore, there has been a great demand for the design of a hydraulic pulsation damper with a new structure that can solve all the above problems.

The present invention solves the above problems, prevents internal leakage, improves durability, has an effect on the pulsation of the wide frequency range, the hydraulic pulsation damper of the more advanced structure and the accumulator using the same And a gas replenisher.

1 is a schematic diagram showing the configuration of a general hydraulic system

2 to 4 show the structure of a conventional hydraulic pulsation damper,

2 is a sectional view showing a piston type attenuator;

3 is a cross-sectional view of the attenuator of the bladder type;

4 is a cross-sectional view of an attenuator of the resonator type;

5 to 7 illustrate an embodiment of the present invention.

5 is a perspective view of a hydraulic pulsation damper

6 is a cross sectional view of a hydraulic pulsation damper;

7 is a cross-sectional view showing a state where the gas supply and the hydraulic pulsation damper are combined;

** Description of the symbols for the main parts of the drawings **

20: body 23: bellows

27: hydraulic working fluid connection flow path 28: guide plate

30: separating plate 50: plug bolt

In order to achieve the object as described above, the present invention, the receiving space is formed inside, the entrance and exit of the pulsation damping gas is formed on the top, the lower and the body is formed with the entrance and exit of the hydraulic working fluid; A separation plate slidably mounted in the body in a vertical direction and separating the interior of the body into a pulsation damping gas chamber and a hydraulic working fluid chamber; A bellows installed between the inner surface of the body and the separator to isolate the pulsation damping gas and the hydraulic working fluid; Opening and closing means detachably mounted to the pulsation damping gas entrance; A hydraulically actuated fluid connection passage formed perpendicularly to the inflow and outward direction of the hydraulically actuated fluid entrance and exit; To present a hydraulic pulsation damper comprising.

Here, it is preferable to further include a hydraulic working fluid guide plate formed in a direction resisting the flow direction of the connection flow path in the connection portion of the hydraulic working fluid connection flow path and the hydraulic working fluid inlet, the through hole formed in the core.

In addition, it is preferable to further include a sliding seal mounted to the outer peripheral portion of the separation plate.

In addition, a support rod protruding from the lower surface of the separation plate; A support rod guide installed on an inner surface of the body to guide the up and down driving of the support rod; It is preferable that the separator further comprises a horizontal holding means.

The opening and closing means may include a cylindrical body part having a pulsation damping gas inlet flow path formed therein and a threaded part formed on an outer circumferential surface thereof; A stopper portion formed on an upper portion of the cylindrical body portion and having a wrench mounting portion formed on an upper surface thereof; It is preferable that it is a plug bolt containing.

On the other hand, as another means for achieving the object of the present invention, by using the hydraulic pulsation damper proposes an accumulator of the structure provided with a control valve at the hydraulic working fluid inlet.

In addition, as another means for achieving the object of the present invention, a gas inlet flow path is formed therein and includes a cylindrical body portion formed with a threaded portion on the outer peripheral surface, and a stopper portion formed on the upper surface of the cylindrical body portion and the wrench mounting portion formed on the upper surface; An apparatus for supplying gas to a gas reservoir having a plug bolt to open and close, comprising: a body sealed to the outside and having a gas flow path formed therein; A rotating rod rotatably mounted to the body, and having a wrench through hole formed at a lower end thereof, and a wrench guide path formed at a core thereof; A wrench mounted to the wrench mounting portion of the plug bolt through a wrench through hole of the rotary rod to open and close the plug bolt by vertically reciprocating driving and rotating driving; A wrench restraining plate provided in the wrench through-hole of the rotating rod to restrict the rotational drive of the wrench by forming a through-hole having the same shape as that of the cross section of the wrench; A fastening cap installed to be detachable from the body of the gas reservoir; A gas inlet formed to allow gas to flow into an internal gas flow path of the body; A pressure gauge installed in the middle of the gas inlet; Present a gas refueler comprising.

In addition, the restriction pin protruding on the side of the wrench; A constraining groove formed at a side of the rotating rod so that the constraining pin is inserted and driven up and down; It is preferable to further include a wrench restraining means provided.

In addition, the wrench restraining means preferably further comprises a restoring spring mounted to the inner guideway of the rotating rod to elastically support the wrench downward.

In addition, it is preferable to further include a rotary handle formed on the upper end of the rotating rod.

Furthermore, it is effective to further include a relief valve extending outward from the internal gas flow path of the body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 to 7 illustrate an embodiment of the present invention, FIG. 5 is a perspective view of a hydraulic pulsation damper, FIG. 6 is a cross sectional view of a hydraulic pulsation damper, and FIG. Cross section view.

As shown, the hydraulic pulsation damper according to the present invention is formed in the receiving space therein, the entrance and exit of the pulsation damping gas is formed at the upper portion, the body 20 is formed with the entrance and exit 29 of the hydraulic working fluid in the lower portion )Wow; A separation plate 30 slidably mounted in the body 20 in a vertical direction to separate the interior of the body 20 into a pulsation damping gas chamber 100 and a hydraulic working fluid chamber 200; A bellows 23 disposed between the inner surface of the body 20 and the separator plate 30 to isolate the pulsation damping gas and the hydraulic working fluid; Opening and closing means detachably mounted to the pulsation damping gas entrance and exit 24; A hydraulically actuated fluid connection passage 27 formed perpendicular to the inflow and outward direction of the hydraulically actuated fluid inlet and outlet 29; It is configured to include.

That is, the present invention divides the interior of the hydraulic pulsation damper into the pulsation damping gas chamber 100 and the hydraulic working fluid chamber 200 by the separation plate 30 of a solid material, but also can be formed by a solid material By taking a structure that completely separates the two spaces by the bellows 23, the problems of internal leakage, durability, and frequency domain of attenuable pulsation, etc., which have been pointed out in the conventional attenuator, are solved at once. It is.

The body 21 is comprised with the cylindrical body 21 and the lower end cap 22 for the ease of manufacture.

The hydraulic working fluid guide plate 28 is formed at a connection portion between the hydraulic working fluid connecting passage 27 and the hydraulic working fluid entrance and exit 29 in a direction that resists the flow direction of the connecting flow passage 27 and has a through hole formed in the core. do. This makes it possible to adjust the flow rate of the hydraulic working fluid flowing into the attenuator by adjusting the size of the guide plate and the size of the through hole in the core.

In order to reduce friction between the separator 30 and the inner wall of the body 20, a sliding seal 26 is mounted on the outer circumferential portion of the separator 30.

The separating plate 30 is a member for vertically reciprocating driving in a state in which the gas chamber 100 and the fluid chamber 200 are spatially separated by the bellows 23, and it is preferable to maintain the horizontal plate during its driving. .

Therefore, the support bar 41 protruding from the lower surface of the separating plate 30; Separation plate horizontal holding means 40 constituted by a support rod guide 42 installed on the inner surface of the body 20 to guide the vertical drive of the support rod 41 is installed.

On the other hand, the support rod guide 42 is formed with a plurality of through holes 421 so that the hydraulic working fluid can flow freely in the fluid chamber 200.

The opening and closing means mounted on the gas inlet and outlet 24 of the body 20 is constituted by a plug bolt 50.

As shown in FIG. 7, the plug bolt 50 includes a cylindrical body portion 52 having a pulsation damping gas inflow passage 51 formed therein and a threaded portion 53 formed on an outer circumferential surface thereof; A stopper portion 55 formed at an upper portion of the cylindrical body portion 52 and having a wrench mounting portion 54 formed thereon; It is configured to include.

On the other hand, the structure of the hydraulic pulsation damper according to the present invention can be applied to the accumulator as it is. The accumulator is a device that stores the fluid under pressure in case the hydraulic system fails to operate normally due to a failure. The accumulator is a control valve at the hydraulically actuated fluid inlet 29 to use the stored fluid only when necessary. (7) is provided.

In addition, as a hydraulic pulsation damper according to the present invention, a device for storing gas in a state where a predetermined pressure is applied, when the opening and closing means mounted on the entrance and exit of the gas takes the same structure as the plug bolt 50, It is preferable to replenish gas using a gas replenisher having a structure as described above.

The gas supply unit is sealed to the outside and the body 81 is formed with a gas flow path therein; A rotating rod (83) rotatably mounted to the body (81), having a wrench through hole formed at a lower end thereof, and a wrench guide path formed at a core thereof; When mounted to the wrench mounting portion 54 of the plug bolt 50, a wrench (85) mounted through the wrench through hole of the rotating rod (83) to open and close the plug bolt (50) by vertically reciprocating driving and rotating driving. )Wow; A wrench restraining plate 91 provided in the wrench through hole of the rotary bar 83 to restrict the rotational drive of the wrench 85 by forming a through hole having the same shape as that of the wrench 85 in the core portion; A fastening cap (80) installed to detachably attach the body (81) to the body (20) of the gas reservoir; A gas inlet 89 formed to allow gas to flow into an internal gas flow path of the body 81; A pressure gauge 88 installed in the middle of the gas inlet 89; It is configured to include.

That is, in order to supply gas to a gas reservoir that stores gas under a predetermined pressure such as a hydraulic pulsation damper, not only means for supplying gas into the reservoir but also means for maintaining a predetermined pressure. Since this is necessary additionally, such a configuration is taken.

Constraints pins 86 protrude from the sides of the wrenches 85, and constraining grooves 92 are formed on the sides of the rotating rods 83 so that the restraining pins 86 are inserted and driven up and down. Specifies the limit of up and down return drive.

Restoration spring 84 is mounted on the inner guideway of the rotating rod 83 to elastically support the wrench 85 downwards, and a rotary handle 82 is formed at the upper end of the rotating rod 83, and a dangerous stress due to abnormal high pressure. In order to prevent the condition, the relief valve 87 extends outward from the internal gas flow path of the body 81.

The operation of the gas replenisher according to the present invention will be described below.

Position the replenisher at the gas inlet of a gas reservoir, such as a pulsating gas damper, and attach the wrench 85 to the wrench mounting portion 54 of the plug bolt 50 and securely secure it using the fastening cap 80. .

When the rotary rod 83 is rotated in the opening direction of the plug bolt 50 by using the rotary knob 82, the shape of the through hole of the inner circumference is integrally coupled to the rotary rod 83 and the same as that of the wrench 85. By restraining the wrench restraint plate 91 so formed, the wrench 85 also rotates together, thereby rotating the plug bolt 50 in the opening direction.

The wrench 85 is constrained by the elasticity of the restoring spring 84 and gradually drives upward, and this drive continues until the restraint pin 86 of the wrench reaches the upper limit of the constraining groove 92 of the rotating rod.

The plug bolt 50 coupled to the wrench 85 by the wrench mounting portion 54 also drives upward. When the gas inlet flow passage 51 is opened by reaching the predetermined position, the gas is introduced into the reservoir through the wrench mounting portion 54. To start.

After confirming that the gas has been supplied to the inside of the reservoir through the pressure gauge 88 to have a predetermined pressure, when the rotary knob 82 is rotated in the closing direction, the reverse operation of the above occurs and the plug bolt 50 is stored again. Close the gas exit of the aircraft.

Thereafter, the fastening cap 80 may be disassembled to separate the gas reservoir and the gas supply unit.

The present invention provides a hydraulic pulsation damper of a more advanced structure, an accumulator and a gas supply device using the same, which can prevent internal leakage, improve durability, and have an effect on pulsation in a wide frequency range.

Claims (11)

A body having an accommodation space formed therein, an entrance of a pulsation damping gas formed at an upper portion thereof, and an entrance of an hydraulic working fluid formed at an lower portion thereof; A separation plate slidably mounted in the body in a vertical direction and separating the interior of the body into a pulsation damping gas chamber and a hydraulic working fluid chamber; A bellows installed between the inner surface of the body and the separator to isolate the pulsation damping gas and the hydraulic working fluid; Opening and closing means detachably mounted to the pulsation damping gas entrance; A hydraulically actuated fluid connection passage formed perpendicularly to the inflow and outward direction of the hydraulically actuated fluid entrance and exit; Hydraulic pulsation damper included. The method of claim 1, And a hydraulic working fluid guide plate formed at a connection portion between the hydraulic working fluid connecting flow passage and the hydraulic working fluid inlet port in a direction that resists the flow direction of the connecting flow passage, and having a through hole formed in the core portion. The method of claim 1, Hydraulic pulsation damper, characterized in that it further comprises a sliding seal mounted to the outer peripheral portion of the separation plate. The method of claim 1, A support rod protruding from the bottom surface of the separation plate; A support rod guide installed on an inner surface of the body to guide the up and down driving of the support rod; Hydraulic pulsation damper, characterized in that it further comprises a separating plate horizontal holding means provided. The method of claim 1, The opening and closing means A cylindrical body portion having a pulsation damping gas inlet flow passage formed therein and a threaded portion formed on an outer circumferential surface thereof; A stopper portion formed on an upper portion of the cylindrical body portion and having a wrench mounting portion formed on an upper surface thereof; Hydraulic pulsation damper, characterized in that the plug bolt containing. An accumulator using the hydraulic pulsation damper according to any one of claims 1 to 5, And a control valve at the hydraulic working fluid inlet. Gas supply path is supplied to the gas reservoir using a plug bolt including a cylindrical body portion having a gas inlet flow path formed therein and a screw portion formed on an outer circumferential surface thereof, and a plug portion formed on an upper portion of the cylindrical body portion and a wrench mounting portion formed on an upper surface thereof. As a device, A body sealed to the outside and having a gas flow path formed therein; A rotating rod rotatably mounted to the body, and having a wrench through hole formed at a lower end thereof, and a wrench guide path formed at a core thereof; A wrench mounted to the wrench mounting portion of the plug bolt through a wrench through hole of the rotary rod to open and close the plug bolt by vertically reciprocating driving and rotating driving; A wrench restraining plate provided in the wrench through-hole of the rotating rod to restrict the rotational drive of the wrench by forming a through-hole having the same shape as that of the cross section of the wrench; A fastening cap installed to be detachable from the body of the gas reservoir; A gas inlet formed to allow gas to flow into an internal gas flow path of the body; A pressure gauge installed in the middle of the gas inlet; Include gas supply. The method of claim 7, wherein A constraining pin protruding from the side of the wrench; A constraining groove formed at a side of the rotating rod so that the constraining pin is inserted and driven up and down; Gas supply device further comprises a wrench restraining means provided. The method of claim 8, The wrench restraint means And a restoring spring mounted to the inner guideway of the rotating rod to elastically support the wrench downward. The method according to any one of claims 7 to 9, Gas supply unit further comprises a rotary knob formed on the upper end of the rotating rod. The method according to any one of claims 7 to 9, And a relief valve extending outward from the internal gas flow passage of the body.