CN2348916Y - Control circuit for pressure-change absorption separation pressure-sensor - Google Patents
Control circuit for pressure-change absorption separation pressure-sensor Download PDFInfo
- Publication number
- CN2348916Y CN2348916Y CN 97225611 CN97225611U CN2348916Y CN 2348916 Y CN2348916 Y CN 2348916Y CN 97225611 CN97225611 CN 97225611 CN 97225611 U CN97225611 U CN 97225611U CN 2348916 Y CN2348916 Y CN 2348916Y
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- pressure
- adsorption tanks
- control
- pressure sensor
- valve
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Abstract
The utility model relates to a control return circuit for a pressure-change absorption separation pressure sensor, which is easy to control and can realize the alarm for the deficiency in the pressure. Compared with the other control return circuit, the utility model has the differences that the output ends of two adsorption tanks are connected with a piping in addition, the output ends of two adsorption tanks are connected with a pressure sensor through a shuttle valve, and the input ends of the two adsorption tanks are respectively connected with one two-position three-way valve. The utility model has the principle that the utility model changes the time control into the pressure direct control. The pressure sensor is triggered by the pressure. An electric signal feedback main control circuit is changed by the pressure. Circuits control each valve to be opened and closed. When one adsorption tank carries out absorption when the pressure does not reach to trigger the pressure sensor in definite time, the pressure sensor sends out electric signals. Therefore, the over low pressure alarm is realized.
Description
The utility model relates to a kind of transformation adsorbing separation pressure sensor control loop with the physical method for separation mist.
At present, method, adsorption method, film separation method, electrolytic method that the correlation technique of oxygen separation, nitrogen has condensation and rectifying from air etc. is multiple.Transformation absorption is use always a kind of.In pressure-swing absorption process, air feed is given the molecular sieve with even hole and unified size, and these holes are the specific molecule of absorption selectively, thereby needed gas is separated from mist.For example: use air as source of the gas, can adopt zeolite molecular sieve.So zeolite molecular sieve absorption nitrogen, but adsorption of oxygen not are separable and obtain very pure oxygen by adsorption process.When needing nitrogen equally, can use carbon molecular sieve to remove to adsorb oxygen in the source of the gas, thereby isolate pure nitrogen product.In typical adsorbent equipment, need two adsorption tanks that molecular sieve is housed.Because when first adsorption tanks adsorb when saturated, it needs desorb to adsorb again, so need some product gas desorbs for it.At this moment the product gas that produces of second adsorption tanks, a part enters in the air accumulator, and another part enters first adsorption tanks and carries out desorb.First jar after the desorb can adsorb again and produce product gas, at this moment also just second adsorption tanks adsorb when saturated, separate the product gas that smokes by first adsorption tanks for it provides again, another part product gas enters air accumulator simultaneously.So circulation, air accumulator obtains coming from the continuous product gas of adsorption tanks.
The shortcoming in existing transformation absorption loop:
The control of general transformation absorption control loop is employing time control principle.In adsorption tanks size and volume is that definite value is filled under the situation of quantitative molecular sieve, and it is issued at certain pressure and produces product gas concentration and flow maximum in its adsorption process.It reaches the time and the control cycle time of level pressure power to draw control by experiment, designs sequential control circuit according to these empirical datas.With the keying order of circuit control valve and the work period of valve, thereby realize transformation is adsorbed the control in loop.Because gas has very big compressibility, transformation absorption control loop is complicated again, thus very big to flow, the pressure influence of the gas that moves in the loop, comprise the absorption, the desorption process that influences the interior molecular sieve of adsorption tanks.In addition, along with the rising of height above sea level, air pressure reduces very big relatively, and this is the most fatal weakness of controlling with the time in loop.Control with the time, the time is certain, but the definite value pressure in the adsorption tanks of control has error, the circulation in some cycles of process like this, will make pressure error long-pending more big more, thereby make whole circuit system disorder, directly influence product gas concentration and flow.
The purpose of this utility model just provides a kind of transformation adsorptive pressure sensor control loop convenient and easy, that control is stable and that can realize the insufficient pressure warning, and the utility model can also compensate automatically because of institute height above sea level raises and cause the loop internal pressure not reach the error of definite value pressure, guarantees that circuit system normally carries out.
The utility model is achieved in that the input of two adsorption tanks links to each other with a two position three-way valve respectively, the output of adsorption tanks respectively links to each other with air accumulator by a check valve, the output of two adsorption tanks links to each other with choke valve by another pipe arrangement simultaneously, and the output of two adsorption tanks also links to each other with pressure sensor by the shuttle valve on the 3rd pipe arrangement.
Its principle is: obtain the experience force value by experiment, rule of thumb value is selected pressure sensor for use.When the absorption of first adsorption tanks reaches capacity state, pressure activated at this moment the pressure sensor of selecting for use according to definite value.The signal of telecommunication that sensor sends feeds back in the control circuit, if two position three-way valve is a solenoid directional control valve, control circuit just can directly be controlled the two position three-way valve commutation.If two position three-way valve is an air operated reversing valve, control circuit can be controlled the commutation of two position three-way valve again by the control electromagnetic priority valve with pilot valve.After two two position three-way valve commutations, the saturated back desorb of first adsorption tanks, second adsorption tanks desorb just now, and absorption now; Other second jar also provides portioned product gas to first adsorption tanks when absorption, promote the desorb of first jar.Gas pressure has triggered pressure sensor when second jar is saturated, makes two position three-way valve produce commutation action, first jar of absorption, second jar of desorb again.So circulation constantly makes product gas supply with continuously.If because certain reason makes the adsorption tanks that carry out adsorption process when certain hour does not reach definite value pressure yet, pressure sensor can send the signal of telecommunication to control circuit.Send alarm signal by control circuit, and stop the work in transformation absorption loop.
Embodiment of the present utility model as shown in drawings.
Description of drawings:
Fig. 1. be the out-of-work state of the utility model.
Fig. 2. when being the utility model initialization, all pressures stage of two adsorption tanks.
Fig. 3. be the absorption phase of adsorption tanks in the utility model (2).
Fig. 4. be the absorption phase of adsorption tanks in the utility model (9).
As shown in Figure 1, the utility model comprises two two-position three way solenoid directional control valves (1) and (10), adsorption tanks (2) and (9), check valve (3) and (7), air accumulator (8), choke valve (4), shuttle valve (5), pressure sensing (6).Under the loop quits work state, communicate on the input a of two adsorption tanks and two-position three way magnetic valve (1) and (10) exhaust outlet b.
As shown in Figure 2, during initialization, two reversal valves (1) and (10) are commutation simultaneously under circuit control, and compressed air enters in two adsorption tanks by reversal valve air inlet c, and adsorption tanks were in all and pressed the stage this moment.Pressure in shuttle valve (5) has reached the definite value pressure activated pressure sensor (6), and sensor sends the signal of telecommunication and feeds back to control circuit, and all the pressure stage finishes to this.
As shown in Figure 3, after circuit is received above-mentioned signal, just make reversal valve (10) commutation, at this moment adsorption tanks (2) are in absorption phase, and adsorption tanks (9) are in desorption phase.The gas outlet b of the input a of adsorption tanks (9) and reversal valve (10) communicates, and waste gas is discharged the loop thus.The product gas part that adsorption tanks (2) produce enters in the air accumulator (8) by check valve (3), and another part carries out blowback by choke valve (4) to adsorption tanks (10), helps its desorb.When the pressure activated in the shuttle valve (5) behind the pressure sensor (6), pressure sensor sends the signal of telecommunication and feeds back to governor circuit.
As shown in Figure 4, then control circuit control reversal valve (1) and (10) advances commutation together.Adsorption tanks (2) desorb, adsorption tanks (9) absorption, with Fig. 3 in like manner.Such two adsorption tanks are absorption, desorb alternately, and product gas can be supplied with continuously.
Claims (1)
1 one kinds of transformation adsorbing separation pressure sensor control loops, by two the adsorption tanks of molecular sieve, two check valves, an air accumulator, a choke valve, a shuttle valve, a pressure sensor, two two position three-way valves being housed forms, the output of two adsorption tanks respectively links to each other with air accumulator by a check valve, the output of two adsorption tanks respectively links to each other with choke valve by the second pipe arrangement, and it is characterized in that: the output of two adsorption tanks connects with pressure sensor by the shuttle valve on the 3rd pipe arrangement; The input of two adsorption tanks respectively connects a two position three-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97225611 CN2348916Y (en) | 1997-09-01 | 1997-09-01 | Control circuit for pressure-change absorption separation pressure-sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97225611 CN2348916Y (en) | 1997-09-01 | 1997-09-01 | Control circuit for pressure-change absorption separation pressure-sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2348916Y true CN2348916Y (en) | 1999-11-17 |
Family
ID=33939580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97225611 Expired - Fee Related CN2348916Y (en) | 1997-09-01 | 1997-09-01 | Control circuit for pressure-change absorption separation pressure-sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2348916Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102580482A (en) * | 2012-03-14 | 2012-07-18 | 杭州汉克净化设备有限公司 | Intelligent zero pressure difference switching device for non-heat adsorption compressed air dryer |
-
1997
- 1997-09-01 CN CN 97225611 patent/CN2348916Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102580482A (en) * | 2012-03-14 | 2012-07-18 | 杭州汉克净化设备有限公司 | Intelligent zero pressure difference switching device for non-heat adsorption compressed air dryer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Guo Lianhai Document name: Notification of Termination of Patent Right |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |