GB1413981A - Foam producing apparatus - Google Patents
Foam producing apparatusInfo
- Publication number
- GB1413981A GB1413981A GB250072A GB250072A GB1413981A GB 1413981 A GB1413981 A GB 1413981A GB 250072 A GB250072 A GB 250072A GB 250072 A GB250072 A GB 250072A GB 1413981 A GB1413981 A GB 1413981A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- line
- liquid
- air
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
- G05D16/2046—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means the plurality of throttling means being arranged for the control of a single pressure from a plurality of converging pressures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/003—Control of flow ratio using interconnected flow control elements
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
1413981 Generating foam R V M STAPLE 19 Jan 1973 [19 Jan 1972] 2500/72 Heading B1C A foam producing apparatus especially for plastics insulating foam comprises a mixing chamber 14 supplied with liquid constituents (e.g. resin, and a mixture of hardener and foaming agent) through lines 13a, 13b from pressurized containers 12a, 12b, and with air through a line 11c. The containers 12a, 12b have equal volumes and the concentrations are adjusted to produce the required proportions when the liquids are mixed in equal volumes. There may be a surge reservoir 33 in the air line. Magnetic or optical level indicators 54 may activate control switch 21 to stop foam production before supply of the liquids fails. The mixing device 14 comprises a rear chamber 60 to which air and one liquid are supplied and which connects through apertured plate 61 with another chamber to which the other liquid constituent is fed. There may be a transparent foam delivery and mixing tube 15. The pressure in the chamber 60 is sensed by a pressure-sensitive switch 64 which closes contacts 64A to energize a relay 18 and stop production in the event of excessive back-pressure in the chamber. Air/liquid regulation-As the mixing device is carried up from ground-level the air pressure in line 11c is reduced to counter balance the fall in hydrostatic pressure in the liquid lines by pressure sensors 26, 27 feeding a comparator 28 which energizes relay 24 to close solenoid valve 25 when the air pressure is greater than that in the liquid line by e.g. 1 lb/sq. inch: the relay 24 is de-energized, and valve 25 opened, automatically when the pressure falls. In a modification, Fig. 2 (not shown), the comparator 28 is replaced by another (34) which gives an output on a line (35) when the air pressure lies above an upper or below a lower pre-determined pressure, and on another line (36) when it is below: the upper pre-determined level. An output on line (35) energizes a relay (37) to operate a DC motor (38) the shaft of which is coupled to the spindle of a pressure-reducing valve (41) in air line 11c, so that as the pressure in liquid line 13a falls the pressure in line 11c is reduced. When the device is lowered a signal is also produced on line (36) and energizes a relay (39) which reverses the polarity of supply to motor (38) and hence the direction of operation of the valve (41). In another modification, Fig. 5 (not shown), the air pressure is regulated by a pressure-reducing valve (52) in the air line near the mixing chamber, adjusted so that its output pressure is approximately equal to its control pressure, which is derived from line 13a or 13b through a large bore connection (56). The valve (52) may be of conventional diaphragm type with its control spring removed and replaced by the liquid pressure. Liquid/liquid proportioning-Flow rate sensors 16a, 16b feed a comparator 17 which energizes relay 18 to close solenoid valves 22a, 22b, 25 if the flow rate on either of lines 13a, 13b is more than 10% greater than in the other. Relay 18 may be reset by releasing control switch 21. In a modification, Fig. 3 (not shown). the flow rate sensors are thermistors (42, 43) arranged in adiacent areas of a bridge (44) the other areas of which are equal resistors (47), the measure of flow rate being the cooling effect of the liquid flowing over the thermistors. The bridge output is fed to a comparator (49) analogous to the comparator 17.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB250072A GB1413981A (en) | 1972-01-19 | 1972-01-19 | Foam producing apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB250072A GB1413981A (en) | 1972-01-19 | 1972-01-19 | Foam producing apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1413981A true GB1413981A (en) | 1975-11-12 |
Family
ID=9740663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB250072A Expired GB1413981A (en) | 1972-01-19 | 1972-01-19 | Foam producing apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1413981A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2418068A1 (en) * | 1978-02-25 | 1979-09-21 | Hedrich Vakuumanlagen Wilhelm | CONTROL DEVICES FOR PLANTS FOR THE PREPARATION OF CASTING MOLDING RESIN |
FR2465516A1 (en) * | 1979-09-21 | 1981-03-27 | Skm Sa | Mixing two fluids in predetermined ratio - by two volumetric pumps with alarm in case of variation of the ratio |
DE3425470A1 (en) * | 1984-07-11 | 1986-01-23 | Laboratorium Prof. Dr. Rudolf Berthold, 7547 Wildbad | METHOD AND DEVICE FOR CONTROLLING THE FOAM DENSITY |
WO2009072903A2 (en) * | 2007-12-03 | 2009-06-11 | Airfoama Developments Limited | Mixing apparatus |
CN110354704A (en) * | 2019-03-14 | 2019-10-22 | 中国石油天然气股份有限公司 | Foam generating device |
CN111841372A (en) * | 2020-07-31 | 2020-10-30 | 河南向氏药坊本草医药有限公司 | Liquid medicine serialization mixing stirring device |
-
1972
- 1972-01-19 GB GB250072A patent/GB1413981A/en not_active Expired
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2418068A1 (en) * | 1978-02-25 | 1979-09-21 | Hedrich Vakuumanlagen Wilhelm | CONTROL DEVICES FOR PLANTS FOR THE PREPARATION OF CASTING MOLDING RESIN |
FR2465516A1 (en) * | 1979-09-21 | 1981-03-27 | Skm Sa | Mixing two fluids in predetermined ratio - by two volumetric pumps with alarm in case of variation of the ratio |
DE3425470A1 (en) * | 1984-07-11 | 1986-01-23 | Laboratorium Prof. Dr. Rudolf Berthold, 7547 Wildbad | METHOD AND DEVICE FOR CONTROLLING THE FOAM DENSITY |
DE3425470C2 (en) * | 1984-07-11 | 1986-07-24 | Laboratorium Prof. Dr. Rudolf Berthold, 7547 Wildbad | Method for controlling the nature of a foam when it emerges from a foam conveyor line |
US4676926A (en) * | 1984-07-11 | 1987-06-30 | Laboratorium Prof. Dr. Rudolf Berthold | Method of regulating the quality of a foam when it exits from a foam conveyor line |
WO2009072903A2 (en) * | 2007-12-03 | 2009-06-11 | Airfoama Developments Limited | Mixing apparatus |
WO2009072903A3 (en) * | 2007-12-03 | 2009-08-20 | Airfoama Developments Ltd | Mixing apparatus |
AU2008332008B2 (en) * | 2007-12-03 | 2012-11-08 | Airfoama Developments Limited | Mixing apparatus |
CN110354704A (en) * | 2019-03-14 | 2019-10-22 | 中国石油天然气股份有限公司 | Foam generating device |
CN111841372A (en) * | 2020-07-31 | 2020-10-30 | 河南向氏药坊本草医药有限公司 | Liquid medicine serialization mixing stirring device |
CN111841372B (en) * | 2020-07-31 | 2022-09-06 | 安徽灿松工程技术有限公司 | Liquid medicine serialization mixing stirring device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |