Fluid handling – With indicator – register – recorder – alarm or inspection means – Plural
Patent
1996-11-06
2000-05-23
Chambers, A. Michael
Fluid handling
With indicator, register, recorder, alarm or inspection means
Plural
137269, 1374875, 137554, 137557, 137884, F16K 7100, F16K 1100
Patent
active
060654945
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention related to a hydraulic function-performing unit having a main housing and at least one movable function-performing element, the position and/or movement of which in the main housing determines flow and/or pressure conditions and/or chamber volumes for hydraulic fluid, and having at least one sensor.
Hydraulic function-performing units which come into consideration include, for example, valves, especially proportional valves, in which the function-performing element is formed by the valve member, a main slide valve or a compensating slide valve. Here, the control of the movement or the position of at least one function-performing element is often effected externally, and in some cases only indirectly. The function-performing unit may, however, also be in the form of an actuating unit, for example a piston-cylinder unit. The function-performing element, the piston, is here displaced by the hydraulic fluid.
U.S. Pat. No. 4,796,661 discloses the incorporation of a pressure sensor in a proportional electro-hydraulic pressure control valve, the sensor delivering an electrical output signal which can be used to indicate the controlled pressure numerically or to effect control of the current of a magnet which in its turn is responsible for the position of the valve member in the valve housing.
Furthermore, it is known from an electronic load sensing system "E.LS.A" of the firm Barmag AG, Remscheid, to provide a valve block comprising electrically controlled proportional displacement valves with pressure sensors which detect the pressure difference between pump delivery flow and maximum active load.
It is also known from German patent application P 42 41 848, which is not a prior publication, to use a pressure sensor in a controlled proportional valve, the pressure sensor converting the maximum load pressure into an electrical voltage signal.
The installation of sensors in the function-performing unit is not always without problems. Normally, not only do additional bores have to be made, through which the hydraulic fluid is able to reach the sensors or the vicinity of the sensors, seats for the sensors also have to be provided. Not only do these seats have be constructed so that the sensor has sufficient room, the sensor must normally also be safeguarded against being forced out of the housing again under the influence of the hydraulic pressure. On the other hand, the sensors are in many cases sensitive to damage. Such damage can easily occur as the function-performing unit is being assembled, that is, as the sensor is being installed in the function-performing unit.
SUMMARY OF THE INVENTION
The invention is therefore based on the problem of simplifying the mechanical construction of a function-performing unit having a sensor.
This problem is solved in the case of a function-performing unit of the kind mentioned in the introduction in that the sensor is accommodated inside a sensor housing, the sensor housing and the main housing have adjoining interface faces, and there is provided at least one transmission channel which is led through the interface face and connects a measuring point in the main housing to the sensor.
The function-performing unit is divided by this construction into several sections. One section, which is formed essentially by the main housing and the parts it contains, serves merely for realization of the function of the function-performing unit. This section need not differ substantially from a conventional function-performing unit without sensors. The other section, which is essentially formed by the sensor housing and the parts it contains, serves to determine the required measurement values in the function-performing unit. Both parts can be manufactured separately from one another. Because the sensors are housed in the sensor housing, they are also protected therein. The sensor housing can be transported and handled as a unit without problems, without risk of the sensors contained therein being damaged during transport or during manufacture, that
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Ennemark Poul
Nielsen Finn Visgaard
Thomsen Svend Erik
Chambers A. Michael
Danfoss A/S
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