CN202878580U - Measuring and injecting device for supercritical fluid - Google Patents
Measuring and injecting device for supercritical fluid Download PDFInfo
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- CN202878580U CN202878580U CN 201220570377 CN201220570377U CN202878580U CN 202878580 U CN202878580 U CN 202878580U CN 201220570377 CN201220570377 CN 201220570377 CN 201220570377 U CN201220570377 U CN 201220570377U CN 202878580 U CN202878580 U CN 202878580U
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Abstract
The utility model discloses a measuring and injecting device for a supercritical fluid, wherein an inlet of a pressure reducing valve is connected with a compressed air source, and the outlet of the pressure reducing valve is connected with the inlets of a first low-pressure gas pressure controller and a second low-pressure gas pressure controller, and the inlets of a first solenoid valve, a second solenoid valve and a third solenoid valve via pipelines; the inlet of a first high-pressure gas pressure controller is connected with a high-pressure foaming agent source, and the outlet of a third stop valve is connected with a charging barrel of an injection moulding machine; the outlets of the first low-pressure gas pressure controller and the second low-pressure gas pressure controller are connected with pilot gas connectors of the first high-pressure gas pressure controller and a second high-pressure gas pressure controller respectively; the first solenoid valve, the second solenoid valve and the third solenoid valve are connected with a first stop valve, a second stop valve and the third stop valve respectively; the first high-pressure gas pressure controller, the first stop valve, a foaming agent measuring tank, the second stop valve, the second high-pressure gas pressure controller, a quantification valve and the third stop valve are sequentially connected by pressure pipelines, and a pressure sensor and a temperature sensor are arranged between the first stop valve and the second stop valve; and the quantification valve is rotated to a proper opening position according to the pre-calibrated relationship between a pressure difference and a flow rate.
Description
Technical field
The utility model relates to gaseous fluid metering injecting device and method for implanting, be particularly related to a kind of accurate measurement and stable injection device of supercritical fluid, be used for polymer supercritical fluid microporous foam injection moulding etc. has strict demand to supercritical fluid implantation dosage, injection pressure, injection flow etc. system.
Background technology
For adapting to plastic industry market development demand and satisfying the industrial requirement that can either reduce the plastic product cost and don't reduce its mechanical performance, phase early 1980s, the scholar of masschusetts, u.s.a Polytechnics (MIT) at first proposes and has developed the microcellular plastics material.The polymer micro expanded material abscess-size of preparation is little take thermoplastic as matrix, take supercritical fluid as physical blowing agent, cell density is high, compare with the polymeric material of not foaming, its density can reduce by 5%～95%, impact strength can increase up to 5 times, toughness improves 5 times, and rigidity increases by 3～5 times, prolongs 5 times fatigue life, dielectric constant and thermal conductivity decline to a great extent, and the simultaneously preparation of polymer micro expanded material uses safety and environmental protection gas (to be generally N
2Or CO
2), environmentally safe.Because these unique performances make the application of micropore foamed polymer material very broad, are called as " new material of 21 century ".
Supercritical fluid is the special fluid of a kind of state between gas and liquid, has double properties and the characteristics of gas liquid concurrently, and close to gas, density and solvability are close to liquid such as viscosity and diffusion coefficient.Supercritical fluid has the character of many uniquenesses simultaneously, and is little such as viscosity, and the character such as density, diffusion coefficient, solvability change very responsive with temperature and pressure.
In the polymer micro foaming process, the accurate measurement of supercritical fluid physical blowing agent implantation dosage and the stable control of injection process with and with the reliable fused of polymer melt be the key technology of microporous foam, the supercritical fluid aerating powder implantation dosage what, inject stability and fused degree direct influence to cell size and the cell density of polymer foaming goods, and then determine the final mass of plastic product.U.S. Trexel, Inc. discloses a kind of " blowing agent introduction system and method " (publication number: patented technology 1732073) by name on February 8th, 2006 in Chinese patent literature, this technology mainly contain " entrance that can be connected with the blowing agent source be connected the accumulator of the outlet that is connected with the blowing agent mouth of extruding machine; the pressure-regulating device between blowing agent source and accumulator entrance; measure the pressure of the macromolecular material in the extruding machine and the device for pressure measurement constructing and arrange " and can receive control system with the output pressure signal, can be during the fusion cycle of mold cycle the blowing agent of one or more dosage be introduced macromolecular material in the extruding machine.Because before introducing, blowing agent is limited in the accumulator of fixed volume, therefore can realize introducing by the pressure of gas in control accumulator volume and the cylinder blowing agent dosage accurate stable of macromolecular material in the extruding machine.But this patented technology does not provide clearly definition to structure and the pressure controlled method of the pressure regulating system under it, has apparent uncertainty in application facet.The Beijing Zhongtuo Machinery Co., Ltd discloses a kind of " metering system for supercritical fluid foaming agent " (publication number: patented technology 101830049A) by name on September 15th, 2010 in Chinese patent literature, this technology " adopts the mode of constant volume measurement; by fixing blowing agent tank volume; temperature; the initial pressure of supercritical fluid is injected in control in the barrel; guarantee that each fusion cycle is a stationary value to barrel injection blowing agent dosage ", but this technology is not controlled the blowing agent injection process, can not realize the stable and uniform of blowing agent injection process, the disposable metering of supercritical fluid aerating powder that only is suitable for the little frothing injection spare of small size is carried, and has sizable limitation in application.
The utility model content
The utility model is according to above-mentioned the deficiencies in the prior art part, the mode of a kind of constant temperature constant volume measurement, the injection of constant voltage current stabilization is proposed, by the volume of fixing supercritical fluid aerating powder measuring tank, the fixing temperature of blowing agent measuring tank, the pressure of control blowing agent measuring tank changes, control simultaneously pressure from foaming agent fluid to injecting machine material tube and the flow rate of injecting, guarantee in each fusion cycle to inject to barrel constant and injection process stable of blowing agent dosage, thus the stability of assurance foam process.
To achieve these goals, the utility model adopts following technical scheme.
Supercritical fluid metering injecting device described in the utility model comprises pressure-reducing valve, the first low-pressure gas pressure controller, the first magnetic valve, the second magnetic valve, the second low-pressure gas pressure controller, the 3rd magnetic valve, the first high-pressure gas pressure controller (the high-pressure gas pressure controller can be the gas control pressure regulator valve), the first stop valve (the first stop valve can be pneumatic stopping valve), pressure sensor, the blowing agent measuring tank, temperature sensor, the second stop valve (the second stop valve can be pneumatic stopping valve), the second high-pressure gas pressure controller (the high-pressure gas pressure controller can be the gas control pressure regulator valve), the 3rd stop valve (the 3rd stop valve can be the pneumatic high-voltage needle-valve), data are processed and control system.
Wherein, the import of pressure-reducing valve is connected with compressed air source, and the outlet of pressure-reducing valve is connected with the import of the first low-pressure gas pressure controller, the import of the first magnetic valve, the import of the second magnetic valve, the import of the second low-pressure gas pressure controller, the import of the 3rd magnetic valve by pipeline; The import of the first high-pressure gas pressure controller is connected with high-pressure foam agent source, and the outlet of the 3rd stop valve is connected with the barrel of injection machine; The outlet of the first low-pressure gas pressure controller, the second low-pressure gas pressure controller is connected with the pilot gas interface of the first high-pressure gas pressure controller, the second high-pressure gas pressure controller respectively; The first magnetic valve is connected with the first stop valve, and the second magnetic valve is connected with the second stop valve, and the 3rd magnetic valve is connected with the 3rd stop valve; The first high-pressure gas pressure controller, the first stop valve, blowing agent measuring tank, the second stop valve, the second high-pressure gas pressure controller, the 3rd stop valve connect with pressure pipeline in order, and pressure sensor, temperature sensor are arranged between the first stop valve and the second stop valve; Data are processed and to be connected with pressure sensor, temperature sensor, control system for shot machine by communication wire or cable with control system and to receive signal, by communication wire or cable with the first low-pressure gas pressure controller, the first magnetic valve, the second magnetic valve, the second low-pressure gas pressure controller, the 3rd magnetic valve is connected and export control signal.
Described data are processed with control system and are comprised the PLC controller, controller receives the feedback signal of pressure, temperature, injection machine, control the output pressure of the first low-pressure gas pressure controller, the second low-pressure gas pressure controller according to the data relationship of in advance design, control the logical switching of closing and then control the first stop valve, the second stop valve and the 3rd stop valve of the first magnetic valve, the second magnetic valve, the 3rd magnetic valve, realize that each plastifies the stable of the constant and injection pressure of cycle period blowing agent implantation dosage, flow rate.
Described high-pressure gas pressure controller (gas control pressure regulator valve) is the capital equipment of this system held pressure stability, the gas control pressure regulator valve utilizes low-pressure gas control gases at high pressure, realization can preferably be adopted Tescom 44 serial pneumatics load reduction valve to the pressure-reduced and-regulated of supercritical fluid; The pressure control range of the first low-pressure gas pressure controller is preferably 0.1～0.8MPa, can preferably adopt the Tescom ER3000 electronic pressure controller of U.S. Emerson company.Described gas control pressure regulator valve and the first low-pressure gas pressure controller are used, and realize the constant of output pressure.
During with interior goods, the pressure pipeline volume between described connection the first stop valve, the second stop valve and the volume sum of blowing agent measuring tank are preferably 10～250cm to the injection moulding quality at 1000g
3
The pressure control range of described the first high-pressure gas pressure controller is preferably 4～35MPa, and the pressure control range of the second high-pressure gas pressure controller is preferably 4～25MPa.
The utility model can also comprise proportional valve, and proportional valve is arranged between the second high-pressure gas pressure controller and the 3rd stop valve, and proportional valve rotates to suitable aperture position by demarcating in advance good pressure differential and flow rate relation.
Described supercritical fluid aerating powder includes but not limited to N
2Deng gas.
The utility model also provides a kind of supercritical fluid metering method for implanting, comprises the steps:
Step (1), before described device is started working, data were processed with control system according to the raw material of micro polymer foaming product, volume and blowing agent inject time, the flow when calculating the quality that generates the needed blowing agent of little foamed products or volume and blowing agent and injecting.The parameter of regulating injection machine is controlled at a certain value between 8～25MPa with reciprocating screw rod plasticizing apparatus barrel plasticizing melt pressure, compare according to this force value and the pressure differential of demarcating in advance good proportional valve and flow curve, calculate the inlet pressure that generates proportional valve.Set the inlet pressure of the second high-pressure gas pressure controller than the high 1～2MPa of outlet pressure, this force value is the blowing agent measuring tank and finishes the pressure that should arrive after the injection, as the rear metering pressure value of blowing agent measuring tank.According to the quality or the volume that calculate the needed blowing agent of little foamed products that generates, connect pressure pipeline volume between the first gas control shutoff valve, the second gas control shutoff valve and the volume of blowing agent measuring tank, the temperature signal that receives, and rear metering pressure value, data are processed and control system is calculated the pressure differential that the blowing agent measuring tank produces when generating the blowing agent that injects required dosage, obtain the front metering pressure value of blowing agent measuring tank.
Step (2), described device is started working, the first high-pressure gas pressure controller connects the high-pressure foam Jiyuan, the first stop valve is opened, the second stop valve is closed, data are processed the pilot gas pressure of controlling the first high-pressure gas pressure controller with control system by the first low-pressure gas pressure controller, the output pressure that makes the first high-pressure gas pressure controller is the front metering pressure value of blowing agent measuring tank, inflate for the blowing agent measuring tank, close the first stop valve when the blowing agent measuring tank reaches front metering pressure value.
Step (3), after the data processing receives the plasticizing commencing signal of injection machine with control system, postpone 0.5 second to 2 seconds time, open simultaneously the second stop valve and the 3rd stop valve, and to make the output pressure of the second high-pressure gas pressure controller by the pilot gas pressure that the second low-pressure gas pressure controller is controlled the second high-pressure gas pressure controller be the inlet pressure of the proportional valve that calculates, begins to carry out gas injection.
Step (4), data are processed the pressure that receives from pressure sensor with control system and are changed, when the pressure decreased of blowing agent measuring tank arrives rear metering pressure, close simultaneously the second stop valve and the 3rd stop valve is finished gas injection, and open the first stop valve, again the blowing agent measuring tank is inflated, waited for next fusion cycle.
The beneficial effects of the utility model: compared with prior art, the supercritical fluid metering injecting device that the utility model provides comprises that constant volume constant temperature metering and constant voltage current stabilization inject two funtion parts, has realized the stablizing of constant and injection process of supercritical fluid aerating powder implantation dosage.
Description of drawings
Fig. 1 is the structural representation of the utility model supercritical fluid metering injecting device.
Among the figure, 1, pressure-reducing valve; 2, low pressure gauge; 3, the first electronic pressure controller; 4, the first magnetic valve; 5, the second magnetic valve; 6, the second electronic pressure controller; 7, the 3rd magnetic valve; 8, the first gas control pressure regulator valve; 9, the first pneumatic stopping valve; 10, pressure sensor; 11, blowing agent measuring tank; 12, temperature sensor; 13, the second pneumatic stopping valve; 14, the second gas control pressure regulator valve; 15, proportional valve; 16, pneumatic high-voltage needle-valve; 17, data are processed and control system; I, compressed air source; II, high-pressure foam agent source; III, barrel; IV, control system for shot machine.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
The supercritical fluid metering injecting device of present embodiment comprises pressure-reducing valve 1, low pressure gauge 2, the first electronic pressure controller 3, the first magnetic valve 4, the second magnetic valve 5, the second electronic pressure controller 6, the 3rd magnetic valve 7, the first gas control pressure regulator valve 8, the first pneumatic stopping valve 9, pressure sensor 10, blowing agent measuring tank 11, temperature sensor 12, the second pneumatic stopping valve 13, the second gas control pressure regulator valve 14, proportional valve 15, pneumatic high-voltage needle-valve 16, data processing and control system 17.
Wherein, the import of pressure-reducing valve 1 is connected with the compressed air source I, and the outlet of pressure-reducing valve 1 is connected with the import of the first electronic pressure controller 3, the import of the first magnetic valve 4, the import of the second magnetic valve 5, the import of the second electronic pressure controller 6, the import of the 3rd magnetic valve 7 by pipeline and low pressure gauge 2; The import of the first gas control pressure regulator valve 8 is connected with high-pressure foam agent source II, and the outlet of pneumatic high-voltage needle-valve 16 is connected with the barrel III of injection machine; The outlet of the first electronic pressure controller 3, the second electronic pressure controller 6 is connected with the pilot gas interface of the first gas control pressure regulator valve 8, the second gas control pressure regulator valve 14 respectively; The first magnetic valve 4 is connected with the first pneumatic stopping valve 9, and the second magnetic valve 5 is connected with the second pneumatic stopping valve 13, and the 3rd magnetic valve 7 is connected with pneumatic high-voltage needle-valve 16; The first gas control pressure regulator valve 8, the first pneumatic stopping valve 9, blowing agent measuring tank 11, the second pneumatic stopping valve 13, the second gas control pressure regulator valve 14, proportional valve 15, pneumatic high-voltage needle-valve 16 connect with pressure pipeline in order, pressure sensor 10 is arranged between the first pneumatic stopping valve 9 and the blowing agent measuring tank 11, and temperature sensor 12 is arranged between blowing agent measuring tank 11 and the second pneumatic stopping valve 13; Proportional valve 15 rotates to suitable aperture position by demarcating in advance good pressure differential and flow rate relation; Data are processed and to be connected with pressure sensor 10, temperature sensor 12, control system for shot machine IV by communication wire or cable with control system 17 and to receive signal, are connected with the first electronic pressure controller 3, the first magnetic valve 4, the second magnetic valve 5, the second electronic pressure controller 6, the 3rd magnetic valve 7 and export control signal by communication wire or cable.
The course of work of present embodiment is:
When described device is started working, data were processed with control system 17 according to the raw material of micro polymer foaming product, volume and blowing agent inject time, the flow when calculating the quality (or volume) that generates the needed blowing agent of little foamed products and blowing agent injection.The parameter of regulating injection machine is controlled at a certain desired value between 8～25MPa with reciprocating screw rod plasticizing apparatus barrel III plasticizing melt pressure, compare according to this force value and the pressure differential of demarcating in advance good proportional valve 15 and flow curve, calculate the inlet pressure (i.e. the outlet pressure of the second gas control pressure regulator valve 14) that generates proportional valve 15.Set the inlet pressure of the second gas control pressure regulator valve 14 than the high 1～2MPa of outlet pressure, this force value is blowing agent measuring tank 11 and finishes the pressure that should arrive after the injection, as the rear metering pressure value of blowing agent measuring tank 11.According to the quality or the volume that calculate the needed blowing agent of little foamed products that generates, connect pressure pipeline volume between the first pneumatic stopping valve 9, the second pneumatic stopping valve 13 and the volume of blowing agent measuring tank 11, the temperature signal that receives, and rear metering pressure value, data are processed and control system 17 is calculated the pressure differential that blowing agent measuring tank 11 produces when generating the blowing agent that injects required dosages, obtain the front metering pressure value of blowing agent measuring tank 11, the outlet pressure that is the first gas control pressure regulator valve 8 is set.
Described device is started working, the first gas control pressure regulator valve 8 connects high-pressure foam agent source II, the first pneumatic stopping valve 9 is opened, the second pneumatic stopping valve 13 is closed, data are processed the pilot gas pressure of controlling the first gas control pressure regulator valve 8 with control system 17 by the first electronic pressure controller 3, the output pressure that makes the first gas control pressure regulator valve 8 is the front metering pressure value of blowing agent measuring tank 11, inflate for blowing agent measuring tank 11, close the first pneumatic stopping valve 9 when blowing agent measuring tank 11 reaches front metering pressure value.
After the data processing receives the plasticizing commencing signal of injection machine with control system 17, postpone 0.5 second to 2 seconds time, open simultaneously the second pneumatic stopping valve 13 and pneumatic high-voltage needle-valve 16, and to make the output pressure of the second gas control pressure regulator valve 14 by the pilot gas pressure that the second electronic pressure controller 6 is controlled the second gas control pressure regulator valve 14 be the inlet pressure of the proportional valve 15 that calculates, begins to carry out gas injection.
Data are processed the pressure that receives from pressure sensor 10 with control system 17 and are changed, when the pressure decreased of blowing agent measuring tank 11 arrives rear metering pressure, close simultaneously the second pneumatic stopping valve 13 and pneumatic high-voltage needle-valve 16 and finish gas injection, and open the first pneumatic stopping valve 9, again blowing agent measuring tank 11 is inflated, waited for next fusion cycle.
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (6)
1. supercritical fluid metering injecting device, it is characterized in that, comprise pressure-reducing valve, the first low-pressure gas pressure controller, the first magnetic valve, the second magnetic valve, the second low-pressure gas pressure controller, the 3rd magnetic valve, the first high-pressure gas pressure controller, the first stop valve, pressure sensor, blowing agent measuring tank, temperature sensor, the second stop valve, the second high-pressure gas pressure controller, proportional valve, the 3rd stop valve, data processing and control system; Wherein, the import of pressure-reducing valve is connected with compressed air source, and the outlet of pressure-reducing valve is connected with the import of the first low-pressure gas pressure controller, the import of the first magnetic valve, the import of the second magnetic valve, the import of the second low-pressure gas pressure controller, the import of the 3rd magnetic valve by pipeline; The import of the first high-pressure gas pressure controller is connected with high-pressure foam agent source, and the outlet of the 3rd stop valve is connected with the barrel of injection machine; The outlet of the first low-pressure gas pressure controller, the second low-pressure gas pressure controller is connected with the pilot gas interface of the first high-pressure gas pressure controller, the second high-pressure gas pressure controller respectively; The first magnetic valve is connected with the first stop valve, and the second magnetic valve is connected with the second stop valve, and the 3rd magnetic valve is connected with the 3rd stop valve; The first high-pressure gas pressure controller, the first stop valve, blowing agent measuring tank, the second stop valve, the second high-pressure gas pressure controller, proportional valve, the 3rd stop valve connect with pressure pipeline in order, and pressure sensor, temperature sensor are arranged between the first stop valve and the second stop valve; Proportional valve rotates to suitable aperture position by demarcating in advance good pressure differential and flow rate relation; Data are processed and to be connected with pressure sensor, temperature sensor, control system for shot machine by communication wire or cable with control system and to receive signal, by communication wire or cable with the first low-pressure gas pressure controller, the first magnetic valve, the second magnetic valve, the second low-pressure gas pressure controller, the 3rd magnetic valve is connected and export control signal.
2. supercritical fluid metering injecting device as claimed in claim 1, it is characterized in that, described data are processed with control system and are comprised the PLC controller, controller receives the feedback signal of pressure, temperature, injection machine, control the output pressure of the first low-pressure gas pressure controller, the second low-pressure gas pressure controller according to the data relationship of in advance design, control the logical switching of closing and then control the first stop valve, the second stop valve and the 3rd stop valve of the first magnetic valve, the second magnetic valve, the 3rd magnetic valve.
3. supercritical fluid metering injecting device as claimed in claim 1 is characterized in that, the pressure control range of the first low-pressure gas pressure controller is preferably 0.1～0.8MPa.
4. supercritical fluid metering injecting device as claimed in claim 1, it is characterized in that, during with interior goods, the pressure pipeline volume between described connection the first stop valve, the second stop valve and the volume sum of blowing agent measuring tank are preferably 10～250cm to the injection moulding quality at 1000g
3
5. supercritical fluid metering injecting device as claimed in claim 1 is characterized in that, the pressure control range of described the first high-pressure gas pressure controller is preferably 4～35MPa.
6. supercritical fluid metering injecting device as claimed in claim 1 is characterized in that, the pressure control range of the second high-pressure gas pressure controller is preferably 4～25MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220570377 CN202878580U (en) | 2012-11-01 | 2012-11-01 | Measuring and injecting device for supercritical fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220570377 CN202878580U (en) | 2012-11-01 | 2012-11-01 | Measuring and injecting device for supercritical fluid |
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| Publication Number | Publication Date |
|---|---|
| CN202878580U true CN202878580U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220570377 Expired - Lifetime CN202878580U (en) | 2012-11-01 | 2012-11-01 | Measuring and injecting device for supercritical fluid |
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| CN (1) | CN202878580U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886856A (en) * | 2012-11-01 | 2013-01-23 | 山东大学 | Supercritical fluid metering injection device and injection method |
| CN104275767A (en) * | 2013-07-12 | 2015-01-14 | 宁波大学 | Supercritical fluid conveying device |
| CN105690698A (en) * | 2016-04-27 | 2016-06-22 | 山东大学 | Injection mold and control system and method for controlling pressure of mold cavity |
-
2012
- 2012-11-01 CN CN 201220570377 patent/CN202878580U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886856A (en) * | 2012-11-01 | 2013-01-23 | 山东大学 | Supercritical fluid metering injection device and injection method |
| CN102886856B (en) * | 2012-11-01 | 2014-06-18 | 山东大学 | Supercritical fluid metering injection device and injection method |
| CN104275767A (en) * | 2013-07-12 | 2015-01-14 | 宁波大学 | Supercritical fluid conveying device |
| CN105690698A (en) * | 2016-04-27 | 2016-06-22 | 山东大学 | Injection mold and control system and method for controlling pressure of mold cavity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130417 Effective date of abandoning: 20140618 |
|
| RGAV | Abandon patent right to avoid regrant |