CN102205592B - Device for continuously conveying and metering liquid carbon dioxide - Google Patents
Device for continuously conveying and metering liquid carbon dioxide Download PDFInfo
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- CN102205592B CN102205592B CN 201110115483 CN201110115483A CN102205592B CN 102205592 B CN102205592 B CN 102205592B CN 201110115483 CN201110115483 CN 201110115483 CN 201110115483 A CN201110115483 A CN 201110115483A CN 102205592 B CN102205592 B CN 102205592B
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Abstract
The invention relates to forming and auxiliary equipment of expanded plastics, in particular to a device for continuously conveying and metering liquid carbon dioxide applied to forming and processing of microporous plastics. The device mainly comprises a first plunger pump (100), a second plunger pump (200), a first stop valve (201), a first one-way valve (205), a second one-way valve (206), a second stop valve (202), a third one-way valve (207), a third stop valve (203), a fourth one-way valve (208), a fourth stop valve (204), a back pressure regulating valve (300), a fifth one-way valve (400), a first pressure sensor (500), a second pressure sensor (109), a third pressure sensor (110), a control unit (600), a liquid carbon dioxide source (700) and a coolant circulating device (800). The device for continuously conveying and metering the liquid carbon dioxide can solve the problems of energy consumption required by maintaining a carbon dioxide liquefaction state and flow fluctuation in the continuous conveying and metering process in the prior art. By adopting the device for continuously conveying and metering the liquid carbon dioxide, the conveying and the metering of a stable carbon dioxide foaming agent can be realized no matter for an extrusion foaming forming mode, an injection foaming forming mode or other foaming forming modes.
Description
Technical field
The present invention relates to a kind of foamed plastic moulding auxiliary equipment, particularly a kind of continuous transport metering mechanism that is applied to the liquid CO 2 of cellular plastic processing and forming.
Technical background
(31 ℃ is supercriticality in the time of 7.1MPa) to the temperature and pressure while postcritical of carbon dioxide.When foaming extrusion molding, in liquid CO 2 is transported to extruder barrel after, by adjusting the operating parameters of extruder, carbon dioxide very easily reaches a kind of supercriticality in machine barrel.Under supercriticality, carbon dioxide has good solubility property and diffusion in the polymer of melting, and the immixture by extruder screw forms foamable homogeneous phase solution or single phase soln simultaneously.Because Solubilities of Carbon Dioxide is large, is particularly suitable as blowing agent for the production of the extrusion foaming goods of high foamability, and substitute environmentally harmful fluorine Lyons class blowing agent, such as CFC, HCFC etc., and to the hydrocarbon blowing agent of production environment highly dangerous, such as butane, pentane etc.But in foam shaping by extrusion, how carbon dioxide being transported to continuously without flow velocity fluctuation ground in the machine barrel of extruder is to need the problem that solves.Authorize disclosed patent ZL99118908.6 " the adding method of supercritical carbon dioxide on March 5th, 2003, with by using the method to produce the method for foamed thermoplastic resin's product " in disclosed a kind of method of injecting the supercriticality carbon dioxide, in order to guarantee to stablize the flow ripple disable of transport of carbon dioxide, need to before the scheduled volume delivery pump, keep carbon dioxide in liquefaction, prevent from the scheduled volume delivery pump, producing air pocket.Further, in order to keep this liquefaction, in the temperature that between liquefied carbon dioxide steel cylinder and the scheduled volume delivery pump coolant pump is set and keeps carbon dioxide between-30 ℃-15 ℃.Adopt this solution, need on the one hand very large energy consumption to keep liquefaction, cause very high operation cost; If adopt on the other hand a scheduled volume delivery pump, can't guarantee the pressure carbon dioxide before pressure-control valve stable in the course of conveying, thereby the stream of supercritical carbon dioxide speed that also can't guarantee to be injected in the extruder is stablized ripple disable.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming of prior art, a kind of continuous transport metering mechanism of liquid CO 2 of using for foaming is provided, avoid keeping before entering pump carbon dioxide at low-temperature condition, and guaranteed the stable of output carbon dioxide flow velocity.
Purpose of the present invention realizes by following technical proposal:
The continuous transport metering mechanism of this liquid carbon dioxide, wherein
1) the first plunger displacement pump 100 and the second plunger displacement pump 200 comprise servo drive motor 101, deceleration and bindiny mechanism 102, plunger case 103, plunger 104 and temperature control coolant jacket 105; Suction/output liquid carbon dioxide interface 106 is arranged at the top of plunger case 103;
2) parallel vertical of the first plunger displacement pump 100 and the second plunger displacement pump 200 is placed, and its suction/output liquid carbon dioxide interface 106 is opened in the top of plunger case 103;
3) outside of the plunger case 103 of the first plunger displacement pump 100 and the second plunger displacement pump 200 is coated with coolant jacket 105 by temperature control;
4) the second stop valve 202, the second check valve 206, the first stop valve 201, the first check valve 205 are connected in series with the stainless steel pressure pipeline in order, and the connecting pipe between the second check valve 206 and the first stop valve 201 is connected with the suction/output interface 106 of the first plunger displacement pump 100, form the suction/output channel of the liquid carbon dioxide of the first plunger displacement pump 100, from the second stop valve 202 porch filling liquid carbon dioxide, the carbon dioxide after the outlet of the first check valve 205 output metering; The 4th stop valve 204, the 4th check valve 208, the 3rd stop valve 203, the 3rd check valve 207 are connected in series with stainless steel pressure pipeline order in order, and the connecting pipe between the 4th check valve 208 and the 3rd stop valve 203 is connected with the suction/output interface 106 of the second plunger displacement pump 200, form the suction/output channel of the liquid carbon dioxide of the second plunger displacement pump 200, from the 4th stop valve 204 porch filling liquid carbon dioxide, the carbon dioxide after the outlet of the 3rd check valve 207 output metering; Wherein the entrance with the second stop valve 202 is connected with the stainless steel pressure pipeline with the entrance of the 4th stop valve 204, then is connected to source of liquid carbon dioxide 700; Wherein the outlet with the first check valve 205 is connected with the stainless steel pressure pipeline with the outlet of the 3rd check valve 207, then is connected to the entrance of back pressure regulating valve 300;
5) outlet of back pressure regulating valve 300 is connected to the entrance of the 5th check valve 400 with the stainless steel pressure pipeline;
6) pipeline before back pressure regulating valve 300 entrances arranges the first pressure sensor 500, on the pipeline between the suction of the first plunger displacement pump 100/output liquid carbon dioxide interface 106 to first stop valves 201, the second pressure sensor 109 is set; On the pipeline of the suction of the second plunger displacement pump 100/output liquid carbon dioxide interface 106 to the 3rd stop valves 203, the 3rd pressure sensor 110 is set;
7) coolant circulation device 800 and the first plunger displacement pump 100 be connected plunger displacement pump 200 temperature control separately and be connected with the cooling agent output interface with the cooling agent input interface 107 of coolant jacket 105 and be connected with pipeline; Used the cooling agent of input constant temperature in the coolant jacket 105 to the temperature control of the first plunger case 100 and the second plunger case 200 by coolant circulation device 800;
8) control module 600 is connected with the servo drive motor 101 of the first pressure sensor 500, the second pressure sensor 109, the 3rd pressure sensor 110, the first plunger displacement pump 100, servo drive motor 101, the first stop valve 201, the second stop valve 202, the 3rd stop valve 203, the 4th stop valve 204 usefulness electric wires or the cable of the second plunger displacement pump 200.
Described the first plunger displacement pump 100 and the second plunger displacement pump 200 all are provided with upper level sensor and the lower level sensor of the stroke of control plunger 104; Described upper level sensor is connected with control module 600 with lower level sensor, and sends the signal that plunger 104 arrives upper limit position and lower position to control module 600;
The check valve 400 that comprises in apparatus of the present invention can be installed on the foam forming machine plasticizing apparatus, as being used for introducing in the connecting hole of carbon dioxide on the machine barrel of plastic device, heated by the heat from the forming machine plasticizing apparatus when flowing through between back pressure regulating valve 300 and the check valve 400 pipeline for reducing liquid CO 2 and cause its state variation, the back pressure regulating valve 300 of the present invention's invention is installed near the check valve 400, make between back pressure regulating valve 300 and the check valve 400 piping volume below 5 milliliters, piping volume is below 1 milliliter between further preferred back pressure regulating valve 300 and the check valve 400.
The advantage of apparatus of the present invention be can solve in the prior art scheme existing to keeping the required energy consumption of co 2 liquefaction state, and the flowed fluctuation problem in the continuous metering course of conveying.No matter to foam shaping by extrusion, or the injection foaming moulding, or other foaming mode, all can realize the conveying and metering of stabilized chlorine carbon blowing agent.
Description of drawings:
Fig. 1 is a kind of connected mode signal of the present invention;
Fig. 2 is for being used for the structural representation of a kind of plunger displacement pump of the present invention.
The specific embodiment
Below in conjunction with the specific embodiment and accompanying drawing, structure of the present invention and operation principle are described further.But embodiments of the present invention are not limited to this.
Such as accompanying drawing 1,2 signals, the label among the figure represents respectively: 100-the first plunger displacement pumps, 200-the second plunger displacement pumps, 201-the first stop valves, 202-the second stop valves, 203-Di, three stop valves, 204-Di, four stop valves, 205-the first check valves, 206-the second check valves, 207-Di, three check valves, 208-Di, four check valves, 300-back pressure regulating valve, 400-Di, five check valves, 500-the first pressure sensors, 109-the second pressure sensors, 110-Di, three pressure sensors, 600-control module, 700-source of liquid carbon dioxide, 800-coolant circulation device, 101-servo drive motor, 102-slow down and bindiny mechanism, 103-plunger case, 104-plunger, 105-temperature control coolant jacket, 106-suction/output liquid carbon dioxide interface, 107-cooling agent input interface, 108-cooling agent output interface.
As shown in Figure 1, 2, with two identical plunger displacement pumps, i.e. the first plunger displacement pump 100 and the second plunger displacement pump 200, vertical parallel arranges, makes the suction of plunger case 103/output liquid carbon dioxide interface 106 be in the extreme higher position, top of plunger displacement pump; To be connected in series with the stainless steel pressure pipeline in order and the suction/output liquid carbon dioxide interface 106 of suction/output channel and the first plunger displacement pump 100 that forms the liquid carbon dioxide of the first plunger displacement pump 100 is connected by the second stop valve 202, the second check valve 206, the first stop valve 201, the first check valve 205; To be connected in series with stainless steel pressure pipeline order in order and the suction/output liquid carbon dioxide interface 106 of suction/output channel the second plunger displacement pump 200 that forms the liquid carbon dioxide of the second plunger displacement pump 200 connects by the 4th stop valve 204, the 4th check valve 208, the 3rd stop valve 203, the 3rd check valve 207; The entrance of the second stop valve 202 is connected with the stainless steel pressure pipeline with the entrance of the 4th stop valve 204, then is connected to source of liquid carbon dioxide 700, supply with liquid state or liquid gas mixing carbon dioxide to the first plunger displacement pump 100 and the second plunger displacement pump 200; The outlet of the first check valve 205 is connected with the stainless steel pressure pipeline with the outlet of the 3rd check valve 207, then is connected to the entrance of back pressure regulating valve 300, the liquid carbon dioxide Continuous Flow after the output metering.Servo drive motor 101, the first stop valve 201, the second stop valve 202, the 3rd stop valve 203, the 4th stop valve 204 and first plunger displacement pump 100 of the servo drive motor 101 of described control module 600 and the first pressure sensor 500, the second pressure sensor 109, the 3rd pressure sensor 110, the first plunger displacement pump 100, the second plunger displacement pump 200 are connected with lower level sensor electricity consumption line or cable with the upper level sensor of being connected in the plunger displacement pump 200.Control module 600 receives the first pressure sensor 500, the second pressure sensor 109, the pressure signal of the 3rd pressure sensor 110, upper level sensor in the first plunger displacement pump 100 and the second plunger displacement pump 200 and the triggering signal of lower level sensor, and operating personnel's parameter setting values etc., servo drive motor 101 to the first plunger displacement pump 100, the servo drive motor 101 of the second plunger displacement pump 200, the first stop valve 201, the second stop valve 202, the 3rd stop valve 203, the 4th stop valve 204 sends operational order, control opening and ending of all stop valves, and the running of servo drive motor and rotating speed, the automatic running of implement device.Described the 5th check valve 400 is connected to the carbon dioxide intake of extruder barrel or is installed in the carbon dioxide intake of extruder barrel.Coolant circulation device 800 and the first plunger displacement pump 100 be connected plunger displacement pump 200 temperature control separately and be connected with the cooling agent output interface with the cooling agent input interface 107 of coolant jacket 105 and be connected with pipeline; Used the cooling agent of input constant temperature in the coolant jacket 105 to the temperature control of the first plunger case 100 and the second plunger case 200 by coolant circulation device 800; Wherein said coolant circulation device 800 is preferably the constant temperature cooling-water machine, and the cooling water temperature of output can be a steady temperature between 20 ℃ of 5 –.Described source of liquid carbon dioxide 700 can be selected liquid CO 2 or the carbon dioxide liquid gas mixture of pressure between 20 bar-60 bar, for example, adopts the carbon dioxide air accumulator of 50 common on market bar that carbon dioxide source is provided.
The control method that device of the present invention adopts is:
When the first plunger displacement pump 100 during at even speed metering output liquid carbon dioxide, the second plunger displacement pump 200 sucks carbon dioxide from carbon dioxide source 700, and carries out precompressed.At this moment, the first stop valve 201 is opened, and the second stop valve 202 and the 3rd stop valve 203 are in cut-off state; The 4th stop valve 204 is shown in an open position when 200 suction of the second plunger displacement pump, plunger 104 in the second plunger displacement pump 200 reaches the lower position, trigger lower level sensor wherein, 204 cut-offs of the 4th stop valve, after 200 beginnings of the second plunger displacement pump or the time-delay carbon dioxide in the plunger case is pre-stressed to preset value, for example, 100 bar wait to be switched; The upper limit position that plunger 104 in the first plunger displacement pump 100 arrives wherein, trigger upper level sensor wherein, the first stop valve 201 ends immediately, and the 3rd stop valve 203 is opened simultaneously, and servo drive motor 101 rotating speed on demand of the second plunger displacement pump 200 is the output liquid carbon dioxide evenly; The second stop valve 202 is opened, make the first plunger displacement pump 100 from carbon dioxide source 700, suck carbon dioxide, when the plunger 104 in the first plunger displacement pump 100 arrives the lower position, trigger lower level sensor wherein, 202 cut-offs of the second stop valve are pre-stressed to preset value to the carbon dioxide in the plunger case after 100 beginnings of the first plunger displacement pump or the time-delay, for example, 100 bar wait to be switched; Before plunger displacement pump metering output, owing to adopt preloading method will boost to from the carbon dioxide of carbon dioxide source 700 a higher pressure, the above pressure of critical pressure (7.1MPa) for example, when the temperature of carbon dioxide is no more than critical-temperature (31 ℃), just can remain on liquid state at the carbon dioxide of plunger displacement pump.Owing to pass to the constant temp cooling water between 5-20 ℃ in the coolant jacket 105 of two identical plunger displacement pumps in apparatus of the present invention, make the temperature of the carbon dioxide in the plunger displacement pump remain on a equilibrium temperature below 31 ℃, guarantee that therefore the carbon dioxide in the plunger case is liquid; And so forth, realized incessantly at the uniform velocity output liquid carbon dioxide.In the present invention, for avoiding the fluctuation of output one-way valve 400 downstream pressures on the impact of measuring accuracy, on the liquid CO 2 pipeline, be provided with back pressure regulating valve 300.Its effect is the pressure of stablizing before back pressure regulating valve 300 entrances, keep carbon dioxide before back pressure regulating valve 300 at a stable pressure state; The permanent cooling water owing to circulate in the coolant jacket of the first plunger displacement pump 100 and the second plunger displacement pump 200 always, the temperature constant of the carbon dioxide in the plunger case of maintenance plunger displacement pump, thus the state that has guaranteed the carbon dioxide of plunger displacement pump metering output is consistent.Because the rotating speed of the servo drive motor of plunger displacement pump can maintain stable rotating speed, thereby make volume flow rate or the mass velocity of the liquid CO 2 of output keep stable, eliminate the use side pressure oscillation to the impact of output flow velocity.In some embodiments, described back pressure control valve 300 is the counterbalance valve of pneumatic control, or spring valve; In some other specific embodiment, this back pressure control valve 300 can be the current limiting element of large pressure reduction.In the present invention, be provided with in addition a check valve 400 after back pressure regulating valve 300, its function is to stop the melten gel in the extruder to enter among the pipeline of apparatus of the present invention, causes line clogging.Pipeline between back pressure control valve 300 and choke valve 400 because near the applied at elevated temperature point, liquid CO 2 therebetween can be changed by existence, for example is in supercriticality, causes compression property to change, and causes finally exporting the slightly fluctuation of flow velocity.For alleviating this potential flow velocity fluctuation, be necessary the piping volume between this back pressure control valve 300 and the choke valve 400 is limited in below the 5ml, preferably below 1 ml.
Although below with reference to accompanying drawing to having done to elaborate according to the design of the object of the invention; but those skilled in the art will recognize that; under the precondition that does not break away from the claim limited range; still can make various improvement and conversion to the present invention, and this improvement and conversion still should belong to protection scope of the present invention.
Claims (4)
1. continuous transport metering mechanism of liquid carbon dioxide, it is characterized in that, mainly comprise the first plunger displacement pump (100), the second plunger displacement pump (200), the first stop valve (201), the first check valve (205), the second check valve (206), the second stop valve (202), the 3rd check valve (207), the 3rd stop valve (203), the 4th check valve (208), the 4th stop valve (204), back pressure regulating valve (300), the 5th check valve (400), the first pressure sensor (500), the second pressure sensor (109), the 3rd pressure sensor (110), control module (600), source of liquid carbon dioxide (700), and coolant circulation device (800) composition, wherein:
1) the first plunger displacement pump (100) and the second plunger displacement pump (200) comprise servo drive motor (101), deceleration and bindiny mechanism (102), plunger case (103), plunger (104) and temperature control with coolant jacket (105), and the first plunger displacement pump (100) and the second plunger displacement pump (200) pass through respectively the suction at plunger case (103) top/output liquid carbon dioxide interface;
2) the two is parallel and place perpendicular to ground for the first plunger displacement pump (100) and the second plunger displacement pump (200), and its suction/output liquid carbon dioxide interface (106) is opened in the top of plunger case (103);
3) outside of the plunger case (103) of the first plunger displacement pump (100) and the second plunger displacement pump (200) is coated with coolant jacket (105) by temperature control;
4) with the second stop valve (202), the second check valve (206), the first stop valve (201), the first check valve (205) is connected in series with the stainless steel pressure pipeline in order, and the connecting pipe between the second check valve (206) and the first stop valve (201) is connected with the suction/output interface (106) of the first plunger displacement pump (100), form the suction/output channel of the liquid carbon dioxide of the first plunger displacement pump (100), so that from the second stop valve (202) porch filling liquid carbon dioxide, the carbon dioxide after the outlet output metering of the first check valve (205); With the 4th stop valve (204), the 4th check valve (208), the 3rd stop valve (203), the 3rd check valve (207) is connected in series with stainless steel pressure pipeline order in order, and the connecting pipe between the 4th check valve (208) and the 3rd stop valve (203) is connected with the suction/output interface (106) of the second plunger displacement pump (200), form the suction/output channel of the liquid carbon dioxide of the second plunger displacement pump (200), so that from the 4th stop valve (204) porch filling liquid carbon dioxide, the carbon dioxide after the outlet output metering of the 3rd check valve (207); Wherein the entrance with the second stop valve (202) is connected with the stainless steel pressure pipeline with the entrance of the 4th stop valve (204), then is connected to source of liquid carbon dioxide (700); Wherein the outlet with the first check valve (205) is connected with the stainless steel pressure pipeline with the outlet of the 3rd check valve (207), then is connected to the entrance of back pressure regulating valve (300);
5) outlet of back pressure regulating valve (300) is connected to the entrance of the 5th check valve (400) with the stainless steel pressure pipeline;
6) pipeline before back pressure regulating valve (300) entrance arranges the first pressure sensor (500), to the pipeline between the first stop valve (201), the second pressure sensor (109) is set at the suction of the first plunger displacement pump (100)/output liquid carbon dioxide interface (106); To the pipeline of the 3rd stop valve (203), the 3rd pressure sensor (110) is set at the suction of the second plunger displacement pump (100)/output liquid carbon dioxide interface (106);
7) coolant circulation device (800) and the first plunger displacement pump (100) be connected plunger displacement pump (200) temperature control separately and be connected 108 with the cooling agent input interface (107) of coolant jacket (105) with the cooling agent output interface) be connected with pipeline; Used the cooling agent of input constant temperature in the coolant jacket (105) to the temperature control of the first plunger case (100) and the second plunger case (200) by coolant circulation device (800);
Control module (600) is connected with electric wire or cable with servo drive motor (101), the servo drive motor (101) of the second plunger displacement pump (200), the first stop valve (201), the second stop valve (202), the 3rd stop valve (203), the 4th stop valve (204) of the first pressure sensor (500), the second pressure sensor (109), the 3rd pressure sensor (110), the first plunger displacement pump (100).
2. according to claim 1 the continuous transport metering mechanism of liquid carbon dioxide, it is characterized in that, described the first plunger displacement pump (100) and the second plunger displacement pump (200) all are provided with upper level sensor and the lower level sensor of the stroke of control plunger (104), described upper level sensor is connected with control module (600) with lower level sensor, and sends the signal that plunger (104) arrives upper limit position and lower position to control module (600).
3. according to claim 1 the continuous transport metering mechanism of liquid carbon dioxide is characterized in that piping volume is below 5 milliliters between described back pressure regulating valve (300) and the check valve (400).
4. according to claim 1 the continuous transport metering mechanism of liquid carbon dioxide is characterized in that piping volume is below 1 milliliter between described back pressure regulating valve (300) and the check valve (400).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110115483 CN102205592B (en) | 2011-05-06 | 2011-05-06 | Device for continuously conveying and metering liquid carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110115483 CN102205592B (en) | 2011-05-06 | 2011-05-06 | Device for continuously conveying and metering liquid carbon dioxide |
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| Publication Number | Publication Date |
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| CN102205592A CN102205592A (en) | 2011-10-05 |
| CN102205592B true CN102205592B (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110115483 Active CN102205592B (en) | 2011-05-06 | 2011-05-06 | Device for continuously conveying and metering liquid carbon dioxide |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2066021U (en) * | 1989-08-08 | 1990-11-21 | 国营长空机械厂 | Large flow liquid transport metering mechanism |
| MY118653A (en) * | 1998-07-16 | 2004-12-31 | Mitsui Chemicals Inc | Addition method of supercritical carbon dioxide, and production process of expanded thermoplastic resin product by making use of the addition method. |
| CN1651762A (en) * | 2004-02-06 | 2005-08-10 | 深圳市建恒工业自控系统有限公司 | Valume tube continuous metering type delivering pump device |
| CN202123615U (en) * | 2011-05-06 | 2012-01-25 | 北京中拓机械有限责任公司 | Device for continuously conveying and metering liquid carbon dioxide |
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Address after: No. 3 hospital of Beijing city Changping District 102208 Huilongguan two plectrum plate factory in Beijing Billiton Longxiang mechanical Refco Group Ltd Patentee after: Co., Ltd of mechanical group is opened up in Beijing Address before: No. 3 hospital Huilongguan two plectrum plate factory Longxiang Beijing chn-top machinery limited liability company Patentee before: Beijing Chn-Top Machinery Co., Ltd. |
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