CN100365532C - Pumping type self-adjustment liquid level controller containing no movement components - Google Patents
Pumping type self-adjustment liquid level controller containing no movement components Download PDFInfo
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- CN100365532C CN100365532C CNB2005100428566A CN200510042856A CN100365532C CN 100365532 C CN100365532 C CN 100365532C CN B2005100428566 A CNB2005100428566 A CN B2005100428566A CN 200510042856 A CN200510042856 A CN 200510042856A CN 100365532 C CN100365532 C CN 100365532C
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- liquid level
- tube head
- suction tube
- level controller
- valve
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Abstract
The present invention discloses a pumping type self-adjustment liquid level controller without moving elements, which is composed of a pumping pipe head and a current limiter and utilizes the pumping characteristic of the pipe end to change the capability of the pumping pipe head to output liquid so as to achieve the aim to control liquid level of a container. One end of the pumping pipe head is arranged under the liquid level of the container, and the other end of the pumping pipe head is connected with the outlet end of the current limiter through an outlet valve. For suiting a deviation phenomenon in containing design data and actual data, the present invention is provided with the outlet valve, a bypass valve and a bypass pipe. The pumping type self-adjustment liquid level controller without the moving elements has the obvious advantages of great adjusting range, favorable adjusting performance, hermetical sealing without leakage, etc. Moreover, the present invention solves the serious problems of the increased lower end difference of a heater and reduced economy in the operation of a steam turbine generator possible of being caused when a vapor-liquid two-phase flow type self-adjustment controller for the liquid level is used for the heater of a heat-engine plant.
Description
Technical field
The invention belongs to the automatic control technology field, relate to regulator of level, particularly pumping type self-adjustment liquid level controller containing no movement components.
Background technology
In the commercial production, various containers mostly need by control and regulate, and make level stability in certain scope, satisfy the requirement of technological process, and regulator of level is a kind of product of widespread use.The regulator of level of industrial extensive employing at present has mechanical type, pneumatic type and electrodynamic type.They all are automatic adjusting and the control that realizes liquid level by the machinery of regulator of level outside, electric or pneumatic means.These regulators all act frequently because of its topworks, cause easy to wear, perishable and faults such as frequent bite, or because of faults such as electric, pneumatic element and circuit make liquid level out of control, have a strong impact on safety, the economical operation of equipment and system; Influence the quality and the quantity of technological process, product.Thereby press for more novel, more practical, the more reliable fluid level controller of invention.What middle 1990s rose is the Chinese patent stream-liquid two-phase flow liquid level automatic water level adjuster (patent No.: ZL92232825.0) that principle produces with the stream-liquid two-phase flow flow characteristics, a kind of self-regulation liquid level meter (patent No.: ZL 94246917.8), differential self-adjustment liquid level controller (patent No.: ZL 95210632.9), intellectual self-adjustment liquid level controller (ZL 97239699.3), self-adjustment liquid level controller (ZL 97242212.9) and " a kind of separated two pbase flow liquid level controller " (application number: 200410073350.7), all be the patent that adapts to this requirement.For the ease of narration, the liquid level meter that these patents are related abbreviates " stream-liquid two-phase flow type self-adjustment liquid level controller " as.
Summary of the invention
The objective of the invention is to, a kind of brand-new pumping type self-adjustment liquid level controller containing no movement components is provided, the topworks of this self-adjustment liquid level controller does not have mechanical moving component, no electric, pneumatic element, the whole device of control loop is hermetically sealed and do not have leakage, utilize the pipe end suction properties to change the ability of output liquid, reach the purpose of controlling liquid level.
To achieve these goals, the present invention takes following technical solution:
A kind of pumping type self-adjustment liquid level controller containing no movement components comprises being arranged on the suction of one in industrial container tube head, it is characterized in that be connected with restrictor in the outlet of aspirating tube head by outlet valve, restrictor is connected with liquid output pipe; Outlet at the suction tube head also is connected with a shunt valve that bypass valve is housed, and this shunt valve is connected after the restrictor, and is communicated with liquid output pipe.
Pumping type self-adjustment liquid level controller containing no movement components of the present invention be different from " stream-liquid two-phase flow type self-adjustment liquid level controller " fully on principle of work, and performance and reliability will be much higher than existing same device.Have outstanding advantages such as range of adjustment is big, adjusting function is good, hermetically sealed no leakage, and solved " stream-liquid two-phase flow type self-adjustment liquid level controller " when on the well heater of thermal power plant, using, may cause the significant problem that well heater lower end difference increases, the Turbo-generator Set performance driving economy reduces.
Description of drawings
Fig. 1 is tube end position figure;
Fig. 2 is the vapour phase flow regime map;
Fig. 3 is the liquid phase flow regime map;
Fig. 4 is the variation rule curve of pipe end pumping liquid;
Fig. 5 is pumping type self-adjustment liquid level controller containing no movement components connected system figure of the present invention;
Fig. 6 is make progress flat opening suction tube header structure and placement location figure;
Fig. 7 is that level is cutd open tubular type suction tube header structure, and wherein (b) is the left side side view of (a);
Fig. 8 is that level is cutd open tubular type suction tube head placement location figure;
Fig. 9 is the type map of restrictor, and wherein (a) is orifice plate, (b) is the convergent jet pipe, (c) is the convergent divergent nozzle, (d) is divergent nozzle;
Figure 10 is the standing heater that is used for a thermal power plant drawing-in type self-regulation liquid level meter connected system and suction tube head placement location figure when hydrophobic cooling section is arranged;
Figure 11 is the horizontal heater that is used for a thermal power plant drawing-in type self-regulation liquid level meter connected system and suction tube head placement location figure when hydrophobic cooling section is arranged;
Figure 12 is the standing heater that is used for a thermal power plant drawing-in type self-regulation liquid level meter connected system and suction tube head placement location figure when hydrophobic cooling section is arranged;
Drawing-in type self-regulation liquid level meter connected system and suction tube head placement location figure when the horizontal heater that Figure 13 is used for thermal power plant has hydrophobic cooling section.
Below in conjunction with accompanying drawing and principle of work of the present invention and specifically use embodiments of the invention the present invention is described in further detail.
Embodiment
1, structural principle
Referring to Fig. 5, pumping type self-adjustment liquid level controller containing no movement components of the present invention is made up of suction tube head 2 and 4 liang of big parts of restrictor.
The effect of suction tube head 2 is to change with liquid level 8 to change suction tube head output liquid flow.
The position that suction tube head 2 is placed in industrial container 1 such as Fig. 5, Fig. 6, Fig. 8, Figure 10, Figure 11, Figure 12, shown in Figure 13 will be placed on liquid level 8 times with flat mouthful of pipe end of suction tube head.
As shown in Figure 5, the effect of restrictor 4 is the maximal values of pipeline output liquid flow that restrict export.Restrictor 4 can be an orifice plate, also can be convergent jet pipe or convergent divergent nozzle, divergent nozzle etc., as Fig. 9 (a) and (b), (c), (d) listed four kinds.
Fig. 5 is the connected system figure of pumping type self-adjustment liquid level controller containing no movement components of the present invention, it is by the industrial container 1 (container in the industrial processes, the liquid level of this container requires control automatically, as well heater of thermal power plant etc.), suction tube head 2, restrictor 4, and outlet valve 3 and bypass valve 6 compositions.The concrete connection is described below: a suction tube head 2 is set in the industrial container 1, and 2 outlets of suction tube head are right after outlet valve 3, and outlet valve 3 backs connect restrictor 4, and restrictor 4 backs connect liquid output pipe 5.Connect a shunt valve 7 in 2 outlets of suction tube head, this shunt valve 7 is connected restrictor 4 backs and links to each other with liquid output pipe 5, adorns a bypass valve 6 on shunt valve 7.
Pumping type self-adjustment liquid level controller containing no movement components system as shown in Figure 5, its liquid level control is such realization: when system is in busy hour, the amount of liquid that liquid is discharged from output pipe reaches maximum, this moment, liquid level 8 was in the above 10mm～15mm in suction nozzle plane, industrial container 1 reaches balance into and out of liquid, and liquid level is in stable invariant state; When load descended, the fluid flow that flows into industrial container 1 reduced, and at this moment rate of discharge does not change yet, promptly advances fewly, goes out manyly, and the fluid flow turnover of industrial container 1 is uneven, causes liquid level to descend.When liquid level descended, by the characteristic of suction pipe end, suction capactity descended, and caused the output liquid flow to descend.When liquid level dropped to certain position, liquid reached new balance into and out of flow in the industrial container 1, and level stability is in new position; Otherwise when load rose, the fluid flow that flows in the industrial container 1 increased, and at this moment rate of discharge does not change yet, promptly advances manyly, goes out fewly, and fluid flow causes liquid level to rise into and out of imbalance in the industrial container 1.When liquid level rose, by the characteristic of suction pipe end, suction capactity rose, and caused the output liquid flow to increase.When liquid level rose to certain position, liquid turnover flow reached new balance in the industrial container 1, and level stability is in new position.Reach the purpose of automatic adjusting liquid level thus.For adapt to the deviation (this situation often takes place) that design parameter and actual operation parameters (pressure and flow) occur in engineering practice, outlet valve 3 and bypass valve 6 in system, have been set up, as the usefulness of adjusting positive and negative deviation.Outlet valve 3 and bypass valve 6 can be used the various types of valves with certain throttling performance, for example gate valve, variable valve, butterfly valve or the like.
2. principle of work
The principle of work of pumping type self-adjustment liquid level controller containing no movement components is to utilize the pipe end suction properties to change the ability of output liquid, reaches the purpose of controlling liquid level.
In pressure vessel, insert a flat mouthful of pipe end (see figure 1), during in order to discharged liquid, have following spontaneous phenomenon to take place.In pressure P
1＞P
2, and Δ P=P
1-P
2The various resistances of constant and pipeline are also under the invariant state, when tank fill level when pipe end Ping Kou top 10mm is above, at this moment pipe end level mouth is hermetically sealed by liquid level, liquid thereby pressure reduction suction capactity, from exporting continuous discharged liquid, and the maximum flow of discharged liquid, Δ P and pipe resistance be decided by.If liquid level descends gradually, for example from+10mm reduce to+9mm ,+8mm ,+7mm, though at this moment liquid level will be sealed by pipe end level mouth, begun to have gas to see through liquid level, be the steam bubble shape and discharge (see figure 2) from outlet with liquid.At this moment pumping liquid ability drop, the liquid delivery rate descends thereupon.This phenomenon is along with liquid level constantly reduces, and the steam bubble amount will be on the increase, and pumping liquid ability and output liquid flow will descend rapidly.When liquid level is reduced to flat mouthful of place of pipe end, promptly 0 of the Liquid level scale among Fig. 1 the time, the pumping liquid ability is extremely faint, can only carry the part drop with steam flow and discharge, as Fig. 3.If liquid level continues to drop to-5mm from 0, then steam flow carries the drop amount and progressively goes to zero, and the discharge rate of pumping liquid goes to zero thereupon.Then the discharge rate with liquid is opposite for the discharge rate of gas in the said process, progressively reaches maximum by being output as zero.Their Changing Pattern is through testing referring to the curve as Fig. 4.
Can draw important conclusions thus: liquid level drops to-15mm from+15mm, and the pipe end suction capactity reduces significantly, causes liquid output amount to change very greatly, and flow changes to zero rapidly from maximum.Liquid level change little by little just can change the liquid delivery rate significantly in other words.The natural law and the characteristic of pipe end suction that Here it is.The present invention utilizes this rule and characteristic to realize the automatic adjusting of liquid level, and liquid level change is controlled at very among a small circle, reaches the purpose of control liquid level.
3. concrete application example
Use when of the present invention for the well heater of thermal power plant:, can use suction tube header structure and placement location among Fig. 5, Fig. 6, Fig. 8 if there be not " hydrophobic cooling section " in the well heater; If in the well heater " hydrophobic cooling section " arranged, then the suction tube head directly can be contained in the hydrophobic porch of " hydrophobic cooling section " in the well heater, shown in Figure 10 (being applicable to standing heater) and Figure 11 (being applicable to horizontal heater).If on arranging, have any problem, also can adopt the mode of elbow type suction tube head (it comes down to the flat opening suction tube head that makes progress), shown in Figure 12 (being applicable to standing heater) and Figure 13 (being applicable to horizontal heater).
The liquid level adjustment process of pumping type self-adjustment liquid level controller containing no movement components of the present invention is one typical " dibit has difference to regulate ".Through evidence, its liquid level difference changes very little, is no more than 10mm～20mm from peak load to the minimum load liquid level change, and this is (seeing Fig. 4 family curve) that pipe end suction properties rule is determined.Find out also that from family curve change to 50% or 30% at load from 100%, its steam consumption is very little, is about about 2% of output liquid amount.These regulate index can satisfy the requirement of modern industry to liquid level control.Experimental results show that the principle of the invention is correct, belong to originality, range of adjustment is big, and is functional, level stability; No mechanical moving component, no electric, no pneumatic element have been realized, hermetically sealed nothing is leaked, thereby outstanding advantages such as security, good reliability, long service life are arranged, when having solved " stream-liquid two-phase flow type self-adjustment liquid level controller " simultaneously and on the well heater that " hydrophobic cooling section " arranged, having used, cause the significant problem that well heater lower end difference increases, the Turbo-generator Set performance driving economy reduces, will develop into liquid level control product of new generation.
Claims (10)
1. pumping type self-adjustment liquid level controller containing no movement components, comprise the suction tube head (2) that is arranged in the industrial container (1), it is characterized in that, the outlet of described suction tube head (2) is connected with restrictor (4) by outlet valve (3), and the outlet of this restrictor (4) is connected with liquid output pipe (5); The outlet of described suction tube head (2) also is connected with shunt valve (7), and bypass valve (6) is housed on this shunt valve (7), and this bypass valve (6) is connected with the liquid output pipe (5) of above-mentioned restrictor (4) outlet.
2. fluid level controller as claimed in claim 1 is characterized in that, described restrictor (4) be orifice plate or convergent jet pipe, convergent divergent nozzle, divergent nozzle one of them.
3. fluid level controller as claimed in claim 1 is characterized in that, described suction tube head (2) is shaped as downward flat opening suction tube head or the flat opening that makes progress aspirates tube head or level is cutd open tubular type suction tube head.
4. fluid level controller as claimed in claim 3 is characterized in that, described downward flat opening suction tube head has a flat mouthful pipe end and the downward pipeline section of this pipe end.
5. fluid level controller as claimed in claim 3 is characterized in that, the described flat opening suction tube head that makes progress is to have the pipeline section that a flat mouthful pipe end and this pipe end make progress.
6. fluid level controller as claimed in claim 3, it is characterized in that, described level is cutd open tubular type suction tube head and is comprised an asymmetric horizontal pipeline section of port, the port of this asymmetric horizontal pipeline section is divided into upper end oral area and lower end oral area along horizontal pipeline section center line, along the horizontal pipeline section center line segment distance of being separated by, on upper port and lower port, be respectively equipped with semicircle closure plate between upper end oral area and the lower end oral area.
7. fluid level controller as claimed in claim 1 is characterized in that, described industrial container (1) carries out heat interchange and heating working medium and is heated the unmixed heat interchanger of working medium in the condensation heat transfer mode for the well heater of thermal power plant or other.
8. fluid level controller as claimed in claim 7 is characterized in that, when the well heater of described thermal power plant had hydrophobic cooling section, the import of suction tube head (2) wherein was flat mouthful of downward pipe end of this hydrophobic cooling section water inlet place; The pipeline section that perhaps has the curved shape that a flat mouthful of pipe end and this pipe end make progress for this hydrophobic cooling section water inlet place.
9. fluid level controller as claimed in claim 3 is characterized in that, the flat mouthful pipe end of described suction tube head (2) is placed under the liquid level (8) in the industrial container (1).
10. fluid level controller as claimed in claim 1 is characterized in that, described outlet valve (3) and bypass valve (6) are gate valve or variable valve or butterfly valve or valve with other type of certain throttling performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100428566A CN100365532C (en) | 2005-06-27 | 2005-06-27 | Pumping type self-adjustment liquid level controller containing no movement components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100428566A CN100365532C (en) | 2005-06-27 | 2005-06-27 | Pumping type self-adjustment liquid level controller containing no movement components |
Publications (2)
| Publication Number | Publication Date |
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| CN1702583A CN1702583A (en) | 2005-11-30 |
| CN100365532C true CN100365532C (en) | 2008-01-30 |
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| CNB2005100428566A Expired - Fee Related CN100365532C (en) | 2005-06-27 | 2005-06-27 | Pumping type self-adjustment liquid level controller containing no movement components |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840208A (en) * | 2010-03-29 | 2010-09-22 | 中广核工程有限公司 | Method and system for interlocking main valve and pressure balance valve of heater system of nuclear power station |
| WO2013004049A1 (en) * | 2011-07-01 | 2013-01-10 | Peng Sigan | Method, apparatus, and system for optimizing exhaust backpressure of internal combustion engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2277535Y (en) * | 1994-12-04 | 1998-04-01 | 西安交通大学 | Self-control liquid-level gauge |
| CN2337595Y (en) * | 1997-12-23 | 1999-09-08 | 西安交通大学 | Self-regulating liquid level controller |
| CN1619448A (en) * | 2004-12-06 | 2005-05-25 | 西安交通大学 | Separated two pbase flow liquid level controller |
-
2005
- 2005-06-27 CN CNB2005100428566A patent/CN100365532C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2277535Y (en) * | 1994-12-04 | 1998-04-01 | 西安交通大学 | Self-control liquid-level gauge |
| CN2337595Y (en) * | 1997-12-23 | 1999-09-08 | 西安交通大学 | Self-regulating liquid level controller |
| CN1619448A (en) * | 2004-12-06 | 2005-05-25 | 西安交通大学 | Separated two pbase flow liquid level controller |
Non-Patent Citations (1)
| Title |
|---|
| 汽液两相流自调节水位控制器在300MW机组上的应用. 齐殿全，林万超，陈国慧.中国电力，第34卷第2期. 2001 * |
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Granted publication date: 20080130 Termination date: 20100627 |