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US 11,236,744 B2Granted
Hydraulic pump and respective multifunction valve
AssigneeFluid-O-Tech S.R.L.
InventorsFrancesco Andreis, Roberto Zuppi, Stefano Copelli
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AssigneeFluid-O-Tech S.R.L.
InventorsFrancesco Andreis, Roberto Zuppi, Stefano Copelli
Estimating the term…
A hydraulic pump is described, comprising at least one inlet duct for a fluid, at least one outlet duct for the fluid and at least one pumping unit interposed between the inlet and outlet ducts. At least one multifunction valve is interposed between the inlet duct, upstream of the pumping unit, and the outlet duct, downstream of the pumping unit, which valve is configured to divert the flow of fluid from the inlet duct to the outlet duct without the fluid flowing into the pumping unit. The multifunction valve comprises a valve body that defines an inner bypass channel in which a shutter element is axially movable, an actuator member operatively associated with the shutter element and configured to move it from a closing position to an opening position of the bypass channel, and an elastic contrast element operatively associated with the shutter element and configured to keep it in the first closing position of the bypass channel when such shutter element is not actuated by the actuator member. The actuator member consists of a bias spring manufactured with a shape memory alloy, configured to move the shutter element from the first closing position to the second opening position of the bypass channel when a predefined temperature value is reached.
A hydraulic pump (10) comprising at least one inlet duct (12) for a fluid, at least one outlet duct (14) for the fluid and at least one pumping unit (16) interposed between the inlet duct (12) and the outlet duct (14), wherein between the inlet duct (12), upstream of the pumping unit (16), and the outlet duct (14), downstream of the pumping unit (16), at least one multifunction valve (20) is interposed, which is configured to divert the flow of fluid from the inlet duct (12) to the outlet duct (14) without the fluid flowing into the pumping unit (16), the at least one multifunction valve (20), comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
By means of valves: bypassing
Characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves: using bypass channels
Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids: safety arrangements;…
Opening on surplus pressure on one side; closing on insufficient pressure on one side: spring-loaded
About 12 years 4 months of term left · ends 24 Feb 2039 (estimated)
This application claims the benefit of Italian Patent Application Ser. No. 202016000069965, filed Jul. 5, 2016, the disclosure of which is incorporated herein by reference.
The present invention relates in general to a hydraulic pump and more specifically, to a multifunction valve for a hydraulic pump.
As is known, a thermal bypass valve is a valve used in a pump or in a generic hydraulic circuit for diverting a flow of fluid when a specific temperature is reached. Thermal bypass valves are used in several applications, such as for example heating systems, cooling systems, etc. Usually, thermal bypass valves are provided with actuator devices manufactured with so called “low-melting” metal alloys, i.e. metal alloys that melt at temperatures below 150° C.
The features and advantages of a hydraulic pump and a respective multifunction valve according to the present invention will be more apparent from the following description, which is to be understood as exemplifying and not limiting, with reference to the schematic attached drawings, wherein:
FIG. 1 is a sectional view of a first example embodiment of a hydraulic pump according to the present invention;
FIG. 2 is a sectional view of a multifunction valve belonging to the hydraulic pump in FIG. 1;
It is worth noting that in the accompanying drawings and in the following description, several components of the hydraulic pump will not be mentioned and/or illustrated because they are well-known components to a person skilled in the art.
With reference in particular to FIG. 1, a hydraulic pump according to the present invention is shown, indicated globally with numeral 10. The hydraulic pump 10 comprises at least one inlet duct 12 for a fluid and at least one outlet duct 14 for such fluid. At least one pumping unit 16 is interposed between the inlet duct 12 for the fluid and the outlet duct 14 for the fluid. A filter 18 for the fluid may also be interposed between the inlet duct 12 for the fluid and the pumping unit 16.
The hydraulic pump 10 may consist of, for example, a displacement pump in which the pumping unit 16 comprises a pair of gears. Alternatively, the hydraulic pump 10 could consist of a piston displacement pump. The hydraulic pump 10 may in any case consist also of other types of pumps, not necessarily displacement pumps, such as e.g. a rotary vane pump.