JPS61270532A - Device for controlling undesirable motion - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for controlling desired movement, movement or vibration in a hydraulic or hydraulic device.

The present invention is broadly applicable to the control of vibrations and other undesirable movements, including imposed accelerations and displacements, in mechanical or hydraulic equipment, but particularly to the control of unstable vibrations in safety or control valves. It can be applied to Gun 9- to control movement or chatter.

[Background of the invention]

Irregular vibration (flutter) or chatter of the valve, caused by a number of factors ("Valve 5election Handbo
ok” R, W, Zappe, Page 1 77)
This problem was caused by the use of the government and remains an ongoing problem today. Current practice uses valves designed to reduce this problem, while others strive to reduce the likelihood of chatter by changing the characteristics of the system.

The inventor is reportedly aware of and discusses only two proposals for the anti-chatter valve 1, both of which operate on the principle that friction on the valve stem reduces the likelihood of unwanted movement of the stem. There is.

In one valve, friction is transferred to the stem by a resilient seal loaded by fluid pressure within the valve body. In others, friction is transferred to the stem by a preloaded spring loaded friction collar.

In both cases, the device has the great disadvantage of wear and tear, causing changes in resistance properties and requiring maintenance, and potential contamination of the valve stem or friction elements with foreign materials, making it difficult to use as an anti-rattle device. Make them completely unreliable.

The inventor doubted that the principle actually worked and
I am not aware of any industrial applications for the valves mentioned. A second valve is commercially available, but it too has not proven successful as an anti-rattle device.

Space below: 1 SUMMARY OF THE INVENTION It is an object of the present invention to reliably reduce undesirable movements in surf or hydraulic equipment and to avoid the defects outlined above.
The goal is to provide equipment.

The invention relates to a pair of sealed chambers containing a fluid, each chamber having an end wall and a side wall;
a chamber whose walls are flexible in one direction to permit relative movement between respective end walls of the chamber and cause a corresponding change in the enclosed volume of each chamber, and a fluid passageway between the chambers for allowing passage of fluid from the chamber to the other chamber, and for causing a change in volume within the chamber to cause movement of fluid from the chamber to the other chamber; and means for applying an imposed force or force to at least one end wall.

The imposed force or movement causes fluid VC and flow 71. from one chamber to another chamber. The pressure difference between the chambers resists the imposed force or movement.

The resistance characteristics of the device can be modified by changing the dimensions of each chamber or by changing the dimensions of the communicating channels between chambers. Alternatively, the resistance characteristics can also be modified by changing the properties of the fluid. For example, changes in fluid concentration, viscosity, and compressibility will change the acceleration, velocity, and resistance properties for displacement transmitted.

Preferably, the chamber is essentially cylindrical with side walls that are axially flexible and circumferentially substantially rigid. The side wall is basically in the circumferential direction K lji! ! l In order to be @,
Axial stretching or compression of the chambers causes a change in the enclosed volume, and the warping in turn causes an equal displacement of fluid from one chamber to that of the other.

Chamber +2) Can be in the form of a ring-wound bellows made of III W tri stainless steel or other corrosion-resistant material with the required strength properties. The characteristics of the bellows are basically the imposed force applied to the device, the maximum and minimum expected axial wall deflections, the maximum and minimum expected pressures in the chamber, the number of expected pressures and the displacement cycle. determined by the properties of the fluid.

〔Example〕

Referring initially to the damper configuration shown schematically in FIG. 1, the damper comprises a spool-like member 1 defined by an end wall 2, a central spindle 3 and an end wall 4. A common central end wall 5 is slidably disposed on the spindle 3, the opposite end walls 2 and 4 and the central end wall 5 mutually intersecting with side walls 6 and 7, respectively, to define occlusion chambers 8 and 9. It's connected.

In the embodiment shown, side walls 6 and 7 are each made of a stainless steel convoluted bellows.
ted bellows) or other suitable device that is axially flexible and substantially free of circumferential deformation. A common central end wall 5 is formed with two fluid passages 10 and 11 to allow fluid (eg mineral oil) contained in chambers 8 and 9 to flow between each chamber.

An imposed force or movement applied to the central end wall 5, as indicated by the arrow, causes movement of the vaginal wall 5 in either direction, causing fluid in chambers 8 and 9 to be moved to the other chamber, and The pressure difference created between chambers 8 and 9 resists the imposed force or movement.

2, a common end wall 12 supports an upright post 13 which pivotally supports a lever 21), and end walls 14 and 15 are pivotally attached to the lever 21. ing. The side walls 16 and 17 are the end walls 14 and 1.
5 and a common end wall 12 defining chambers 18 and 19. , a common end wall 12 for each chamber 1
8 and 19. The imposed force or movement directed by the arrow applied to the rocking lever 21 is applied to either chamber 18 or 19. The pressure difference created between chambers 14-18 and 19 will again resist the imposed force or movement.

In the damper shown in FIG. 3, end walls 22 and 23 are interconnected by a conduit 24. In the damper shown in FIG.

End walls 25 and 26 are joined by side walls 27 and 28 to form chambers 29 and 30.
is connected to. The applied force on the end wall 26 and indicated by the arrow is similar to the previous embodiment, the force applied to the chamber 29
or 30 and into other chambers.

Due to its simple structure and applicability to non-braking applications, the Dannoj shown in FIG. preferred for the purpose.

With this installed equipment, Dan i'? - the assembly is enclosed in a housing 33 to which the common end wall 5 is rigidly secured by welding or similar means; The housing 31 is attached to the top of a relief valve 32 of known construction, only a portion of which is shown in the figure, and the lower end of the spindle 3 is attached to the upper end of a valve stem 33 of the relief valve 32, for example with a split bottle as shown. It is bifurcated to allow for mounting. The end walls 2 and 4 are welded to the spindle 3;
The fluid passage in the common end wall 5 is formed by a tube with a funnel-shaped end. Annularly wound stainless steel bellows 6 and if, by welding or other conventional techniques for manufacturing bellows, end walls 2 and 4 and common end wall 5.
are connected in a sealed manner. , movement of the valve stem 33 caused by the action of the relief valve 32 causes a movement of the end walls 2 and 4 with respect to the common end wall 5, thereby transferring fluid from one of the chambers 8 or 9 to the other, thereby It will be appreciated that the movement of the valve stem 33 is damped.

In the illustrated embodiment, bellows 6 and 7 are manufactured by the Expansion Joint Manufacturers Association of America.
It is preferable to design according to the standards of factorers association to match the desired pressure and displacement. For example, in a chamber B containing 10 mB of air at 20°C, 1. Damping on the order of 107 Nm"S is required to prevent chatter in a valve with a "J" size orifice at a set pressure of OMPa and 10% blowout. Such a device has a displacement of 5 days and a pressure of 100 KPa. The walls would be designed for a combined 106 displacement cycle and pressure.

The diameter of the opening 11 in the common end wall 5 is 0.10 smaller than the diameter of the shaft.
The μs large limit must not be exceeded. The fluid passageway between each chamber is, in this example, approximately 3.5 tm internal diameter, 50 mm length tubing with a funnel-shaped end as shown. The fluid used is preferably mineral oil having a kinematic viscosity of 0.16 Ns'm. For a valve having the characteristics described above, the end walls 2 and 4 have an internal diameter of approximately 80 m;
Bellows 6 and 7 must be approximately 93.5 tg long. All materials are preferably 316 stainless steel.

Referring to Figure 5, a preferred Dannoj of the type shown in Figure 3 will be described. In this case, the outer fluid passage opens through the end walls 41 and 42 and the attachment is attached to the object. Eve 40. As in the previous embodiment, a ring-wound diaphragm 43.
44 is connected to end walls 41 and 42 and common end wall 45. For attachment, the protrusion 46 is fixed to the end wall 41, and for open attachment, the handle 47 is attached to the common end wall 45. The spacer plate 49 is installed so that the common end wall 45 is attached to the handle 47 in order to dampen the movement of the handle to which the handle 47 is attached.
7 to maintain a predetermined spacing relationship between end walls 41 and 42. A movable fluid resistance 48 is located on the ij Eve 40, thereby allowing the damping characteristics of the device to be varied.

Dunno e-, which implements the present invention, provides the following advantages.

(&) Not equipped with mechanical seals.

(b) There are no liquid leakage passages, so fluid depletion is eliminated and there is no contamination of the surroundings. Conversely, the surrounding environment will not contaminate the fluid. The device therefore operates in otherwise sensitive or harsh environments.

(C) No contact of any kind between actuating members is required.

As a result, wear and tear is minimal and maintenance is negligible.

(d) Minimal wear and tear ensures long service life and accurate maintenance of resistance properties.

(e) An external reservoir for the #L body is unnecessary.

It will be readily appreciated that the damper structure shown in FIG. 2 is preferred as a relief valve, as are other damper structures used to accomplish similar functions. Similarly,
The cha/par can also be arranged in many different configurations apart from those shown, so the invention should not be considered limited to the configurations shown.

[Brief explanation of the drawing]

Figures 1, 2 and 3 are schematic diagrams of different forms of devices for carrying out the present invention. Figure 4 shows a preferred form attached to a typical relief valve stem, and Figure 5 shows another preferred form (2.4, 14.15, 22, 23, 25, 26... End wall, 6, 7, 16, 17. 27. 28... Side wall (bellows), 3... Spindle (shaft), 10.11
．． 20, 24... Fluid passage, 5, 12... Common end wall, 8, 9.1B, 19, 29, 30... Chaff/J-
, 21... Swing lever, 31... Housing, 32
...Relief valve, 33...Stem, 40...No.9
Iso (fluid passage), 41.42... End wall, 43, 44
...Diaphragm (side wall), 45...Common end wall, 4
6... Attachment is by protrusion, 47... Attachment is by handle, 49...
・Space art. Patent application agent Reinische Almaturen-und-Massie Alfabrinok Patent application agent

Claims (1)

[Claims] 1. A pair of sealed chambers containing a fluid;
provided that each chamber has an end wall and a side wall, the side walls being capable of relative movement between each end wall of the chamber and causing a corresponding change within the enclosed volume of each chamber; a chamber that is flexible in the direction; a fluid passage between the chambers to permit passage of fluid from one chamber to another; and means for applying an imposed force or movement to at least one end wall to cause displacement of the end wall. 2. The device of claim 1, wherein the sidewall is substantially cylindrical, axially flexible and circumferentially substantially rigid. 3. The device of claim 2, wherein the side wall is a ring-wound bellows of a corrosion-resistant material of desired strength, such as stainless steel. 4. spaced apart end walls and a common end wall; an annular bellows attached to each end wall and the common end wall to define a pair of sealed chambers containing fluid;
provided that the bellows is flexible in one direction and substantially rigid in the other direction to permit relative movement between the end walls and the common end wall, from one chamber to the other. a fluid passageway in the common end wall that opens into each of the chambers, and the volume enclosed by the chambers is varied to permit passage of fluid from one chamber to the other; and means for applying a force or movement to at least one of the end walls or the common end wall to axially stretch or compress the chamber to cause an equal displacement. No device for controlling movement. 5. Both end walls are fixedly spaced apart from a central shaft or spindle, and a common end wall is disposed between the end walls and has an opening in the center through which the shaft or spindle is inserted. Apparatus according to claim 4, as passed through. 6. A common end wall defines a base, on which bellows are mounted side by side, the end walls being interconnected by a rocking lever, on which an imposed force or movement is applied. Sectional equipment. 7. The device of claim 5, wherein the common end wall is rigidly attached to a housing surrounding the device and the imposed force or movement is applied to a central shaft or spindle. 8. The device of claim 7, wherein the fluid passageway is defined by a tube having a funnel-shaped end. 9. From claim 1, in which the fluid passage is constituted by an external pipe connected to an opening in the relevant end wall of the chamber, said pipe containing a fluid resistance that serves the control imposed by the device. Apparatus according to any one of paragraphs up to paragraph 3.