EP0225604A2
Expired / Lapsed
EP
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An apparatus for feeding and metering fluid components to a high pressure mixing head
Assignee: Afros SpA
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Filing: 1986-12-03
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Granted: —
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Expires: 2006-12-03
Abstract
Abstract An apparatus for feeding and metering fluid components to a mixing head, in particular for metering and feeding reactive chemical components (A, B) to a high pressure mixing head (10). The apparatus comprises at least a first (17) and a second (18) transfer cylinder whose control unit (25, 26) is fed with hydraulic fluid under constant pressure, and whose component pumping unit (23, 24) is connected to a tank (11, 12) for the component (A, B), respectively to an inlet aperture (21a, 22a) for the component in a chamber (10a) of the mixing head (10), by means of a proportional servo-valve (21, 22) which is controlled in relation to the rate of flow of the components so as to keep both the pressures and the flow of the components to be mixed constant.
Inventors
- 👤 Carlo Fiorentini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 02:20
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/74; B29B7/76; B29B7/7615; B29B7/30; B29B7/58; B29B7/72; B29B7/728; B29B7/7626; B29B7/7631; B29B7/7636; B29B7/7642; B29B7/7663
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
An apparatus for feeding and metering fluid components to a high pressure mixing head (10) comprising at least a first (17) and a second (18) feeding assembly, each feeding assembly (17, 18) comprising a piston type pumping unit (23, 24) actuated by a piston type hydraulic control unit (25, 26), said pumping units (23, 24) being connected to a respective storage tank (11, 12) for the fluid component and, respectively, to a component inlet (21a, 22a) in a chamber (10a) of the mixing head, characterized by the fact that said control units (25, 26) of said first and second component feeding assemblies (17, 18) are connected to a hydraulic fluid source (35) having constant pressure, and by the fact that each pumping unit (23, 24) is connected to the component inlet aperture (21a, 22a) in the mixing chamber (10a), by means of a flow control servo-valve (21, 22) and means (MP, 37, 38) to control said servo-valves (21, 22) in relation to the flow rate of the respective fluid component, to keep the rate of flow and pressure at a constant value.
Claim 2
Independent Claim
182 words
An apparatus for feeding and metering fluid components to a high pressure mixing head (10) comprising at least a first (17) and a second (18) feeding assembly, each feeding assembly (17, 18) comprising a piston type pumping unit (23, 24) actuated by a piston type hydraulic control unit (25, 26), said pumping units (23, 24) being connected to a respective storage tank (11, 12) for the fluid component and, respectively, to a component inlet (21a, 22a) in a chamber (10a) of the mixing head, characterized by the fact that said control units (25, 26) of said first and second component feeding assemblies (17, 18) are connected to a hydraulic fluid source (35) having constant pressure, and by the fact that each pumping unit (23, 24) is connected to the component inlet aperture (21a, 22a) in the mixing chamber (10a), by means of a flow control servo-valve (21, 22) and means (MP, 37, 38) to control said servo-valves (21, 22) in relation to the flow rate of the respective fluid component, to keep the rate of flow and pressure at a constant value.
Claim 3
Dependent Claim
30 words
An apparatus as claimed in claim 1, characterized by the fact that said servo-valves (21, 22) controlling the flows of the components to be mixed are of the proportional type.
Claim 4
Dependent Claim
38 words
An apparatus as claimed in claim 1, characterized by the fact that said component flow control valves (21, 22) are controlled in relation to the speed of the pistons (23a, 24a) of the component pumping units (23, 24).
Claim 5
Dependent Claim
61 words
An apparatus as claimed in claim 1, characterized by the fact that the hydraulic control units (25, 26) of the component feeding and metering assemblies (17, 18) are of the double-acting type and are connected to a single hydraulic pump (35) of the constant pressure type and, respectively, to the hydraulic control fluid tank, by means of solenoid valves (31, 32).
Claim 6
Dependent Claim
90 words
An apparatus as claimed in claim 3, characterized by the fact that it comprises sensing means (37, 38) for sensing the speed of the pistons (23a, 24a) of the component feeding and metering assemblies (17, 18), and an operative connection for transmitting a flow rate signal to the data input (E1, E2) of a processing unit (MP) which compares said flow rate signals with reference signals, the signal outputs (U1, U2) of said processing unit (MP) being operatively connected with control members of the component flow control servo-valves (21, 22).
References Cited (Backward Citations)
No citation records indexed.
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