Device which comprises a rapid-coupling part connectable to...

Fluid handling – Convertible

Reexamination Certificate

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Details

C137S557000, C137S614040, C251S149600, C073S756000

Reexamination Certificate

active

06330890

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a device pertaining to a first rapid-coupling part, preferably a nipple, which is connectable to a system of pressurizable fluid. As examples of such systems can be cited various types of hydraulic systems in which power production and power supply is effected by means of pressurized hydraulic oil. The invention also relates to a rapid-coupling part for systems of this order.
1. Prior Art
In hydraulic systems of this type, it is previously known to use first nipple connections by which instrument apparatuses can be connected in order, for example, to determine the fluid pressure in the system. The use of such nipples is also applied in systems which operate at high pressure, for example at pressure of 250-350 bar. The nipples can also be arranged to withstand pressure peaks which can substantially exceed the values. In the connection the pressure-measuring apparatus in question, a second rapid-coupling part is used which can be coupled together with the first coupling part or the nipple. The second rapid-coupling part, which is normally constituted by a female coupling part, is connected to the nipple in a conventional manner. The second rapid-coupling part is further connected to the pressure-measuring apparatus by some form of line or connection.
It is also previously known two use, in connection with the hydraulic systems or equivalent, a second nipple system for quality measurement of the fluid in question. The second nipple system is in this case configured as nipples for connectability to probe-shaped units which can be inserted or stuck into the nipples in order to extract a small quantity of fluid on which the quality measurement is to be conducted. The probe-shaped unit is connected to a second apparatus, which can be constituted by an instrument apparatus or by a container to be transferred to a quality-measuring apparatus in question. The quality measurement can relate, for example, to the determination of contamination level.
2. Account of the Invention
3. Technical Problem
With this type of nipple system for pressure and quality measurements, it is important for the nipples or first rapid-coupling parts in question to be able to be realized for purposeful and effective operation. There is a need, for example, to be able to reduce the number of components and modules connected to hydraulic systems of this type. In this way, for example, the number of nipples or first rapid-coupling parts will be able to be reduced in number. The main object of the invention is to solve, inter alia, this problem.
It is also important for the nipple system in question to be able to be built up and arranged with components which are known per se and in a manner which is known per se. The invention sets out to solve this problem also.
As a follow-up problem to the above, it is important that despite the product range reduction the nipple or rapid-coupling part system should be able to operate with high repeatability and with sealing functions which prevent undue oil or fluid leakage at the nipples in question. The invention solves this problem also.
A nipple or rapid-coupling system of this order for extracting parameter values in hydraulic systems should also be able to offer time reduction in terms of measurement and sampling of the fluid in the system in question. The invention solves this problem also.
4. The Solution
What primarily can be considered to be characteristic of a device pertaining to a first rapid-coupling part according to the invention is that the first rapid-coupling part operates with a dual function in which, in a first function, the first rapid-coupling part can be coupled together with a second rapid-coupling part and in the coupling position of the parts fluid can be drained off to a first apparatus receiving the drained-off fluid and, in a second function, the first rapid-coupling part is arranged to receive a probe-shaped unit, which is insertable in the first rapid-coupling part, for draining off the fluid to a second apparatus connected to the probe-shaped unit.
In refinements of the inventive concept, the first rapid-coupling part is arranged to establish, when coupled together with the second rapid-coupling part, a first flow duct through the first rapid-coupling part to the first apparatus and the first rapid-coupling part is arranged to establish, upon the insertion of the probe-shaped unit, a second flow duct through the first rapid-coupling part to the second apparatus. The first flow duct can in this case preferably be established with a first valve body, which is longitudinally displaceable when interacting with the second rapid-coupling part and via the outer side of which the first flow duct extends. The second flow duct can preferably be established by means of a second valve body, which is longitudinally displaceable when interacting with the probe-shaped unit and which is placed inside the first valve body.
What primarily can be considered to be characteristic of a rapid-coupling part according to the invention is that it comprises first and second valve systems and that the first valve system can be actuated when the rapid-coupling part is coupled together with a further rapid-coupling part for connection by the further rapid-coupling part to a first apparatus. Further characteristics are that the second valve system can be actuated by use of a probe-shaped unit for connection by the same to a second apparatus.
The first apparatus can in this case comprise a pressure-detecting apparatus also able to detect high pressures, for example 250-350 bar. The second apparatus can comprise a fluid-quality-detecting apparatus or a container (container apparatus) by means of which drained-off fluid is fed to the fluid-quality-detecting apparatus. In a preferred embodiment, the first valve system comprises a first valve body which, when the coupling parts in question are in the coupled position, is longitudinally displaceable against the action of a first spring load and via the outer side of which a first fluid duct can be established in the actuated or longitudinally displaced position of the body. The first valve body interacts in its closing position preferably with a mechanical stop, which can have the form of a metallic seat. The valve body can in this case be sealed against an external shell part by means of a sealing element applied outside the stop or seat, viewed from the free end of the rapid-coupling part, the recess for the sealing element in question being able to be applied to the first valve body and/or the shell part.
In a preferred embodiment, the second valve system is preferably situated at least substantially inside the first valve system or the first valve body. The second valve system can thus be regarded as a pilot valve system in which a first member, preferably in the form of a spherical body or ball, is actuated or can be actuated by a second spring load against a seat and can be lifted against the action of a second spring load, at least at a minor pressure which can lie within the range 1-10 bar, by means of the probe-shaped unit. The first and second spring loads are mutually coordinated so that, when the probe-shaped unit is applied, only the second valve system is actuated, i.e., the first spring load comfortably exceeds the second spring load. The first valve body preferably comprises an internal seal, by means of which the front part of the probe-shaped unit is sealable for avoidance of oil and fluid leakage during activation of the second valve system by means of the probe-shaped unit. Alternatively or by way of supplement, the probe-shaped unit can be provided with sealing members which seal against an inner surface in the first valve body. The second valve system can further comprise a second member, which is pressed against the first: member, i.e., the ball or equivalent, by-means of the second-spring load and which can have the form of a pin, the head part of which bears against the first member and the remaining part of which extends inside a spring producing the seco

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