CN100516552C - Automatic air supply device for reducing cavitation vibration and noise of jet pump - Google Patents
Automatic air supply device for reducing cavitation vibration and noise of jet pump Download PDFInfo
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- CN100516552C CN100516552C CNB2007100528188A CN200710052818A CN100516552C CN 100516552 C CN100516552 C CN 100516552C CN B2007100528188 A CNB2007100528188 A CN B2007100528188A CN 200710052818 A CN200710052818 A CN 200710052818A CN 100516552 C CN100516552 C CN 100516552C
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- plc controller
- supply device
- air supply
- jet injector
- suction tude
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Abstract
This invention discloses an automatic air device reducing vapor-corrosion vibration and noises of jet pumps including a pressure sensor, a PLC controller, a contactor, a master intake pipe, a normal-open valve and an electromagnetic valve, in which the PLC controller includes CPU and A/D and DO connected with it and a supply module.
Description
Technical field
The present invention relates to a kind of liquid-jet pump, relate in particular to a kind of automatic air supply device that can reduce Jet injector because of cavitation induced vibration and noise.
Background technique
Liquid-jet pump (abbreviation Jet injector) is fluid conveying machine and the mix reaction equipment that a kind of turbulent fluctuation diffusion of utilizing rapid jet is transmitted energy and quality.
As Fig. 1, the typical structure of conventional Jet injector is taken over (1), suction chamber (2), suction sleeve (3), nozzle (4), trunnion inlet duct (5), trunnion (6), diffusing tube (7) and outlet pipe (8) by working water and is formed; Working water adapter (1), nozzle (4) link to each other and are installed in the suction chamber (2); Suction chamber (2) is connected with suction sleeve (3), and suction chamber (2), trunnion inlet duct (5), trunnion (6), diffusing tube (7), outlet pipe (8) connect successively.
Owing to itself do not have moving element, that Jet injector has is simple in structure, easy processing, good airproof performance, be convenient to advantage such as maintenance, now has been widely used in national economy all departments.Especially under water, radiation, special occasions such as inflammable, explosive, Jet injector has special advantages, can produce huge economic and social benefit.
The cavitation problem of Jet injector is one of important topic of Jet injector research.The cavitation of Jet injector is different from other type of pump.Jet injector can not stop when cavitation took place, but under certain working pressure, along with the reduction of outlet pressure, the inhalation flow of Jet injector no longer increases, and remains on the certain value.When cavitation took place, Jet injector can produce strong noise and vibration, causes the rapid reduction of Jet injector and system effectiveness, even can have a strong impact on the safety and the economical operation of whole system.
Specifically, during Jet injector work, because the reduction meeting of local compression at first forms micro gasification in the pump near the outlet of nozzle (4) and in the jet boundary layer in the trunnion (6).Micro gasification is crumbled and fall in trunnion (6) front end to central region with the main flow direction downstream flow.When the Jet injector outlet pressure reduces (or working pressure increase), steam bubble quantity showed increased forms the basicly stable cavitation cloud (steam bubble group) of shape, along with the further reduction of outlet pressure, near expansion trunnion (6) outlet of cavitation cloud, and formation mixes vapour-liquid two-phase flow preferably.When the Jet injector cavitation takes place, this two-phase flow state that reaches capacity, thereby block liquid flowing in trunnion (6), thereby the Jet injector outlet pressure is when further descending, its inhalation flow no longer increases, but remains on the certain value.At this moment, steam bubble is crumbled and fall in a large number at the trunnion end, thereby produces violent vibration and noise.
In order to solve the cavitation problem of Jet injector, forefathers have carried out a lot of researchs.The method that solves is concluded and is mainly at present:
1. increase the depth of immersion of Jet injector;
2. increase the area ratio of Jet injector;
3. reduce the working pressure of Jet injector;
4. optimize the shape of Jet injector nozzle and trunnion inlet, improve the condition that becomes a mandarin.
Wherein 1. method can increase engineering cost greatly; 2. and 3. method then can make Jet injector depart from optimum operating condition work, reduces its performance and efficient; What 4. method was improved is limited in scope.In a word, said method can improve the cavitation performance of Jet injector to a certain extent, but does not tackle the problem at its root.
Summary of the invention
Purpose of the present invention just is to overcome the above-mentioned shortcoming and defect that prior art exists, a kind of automatic air supply device that reduces Jet injector cavitation vibration and noise is provided, and this device is that the method by automatic tonifying Qi forms air cushion and reduces vibration and the noise that Jet injector brings out because of cavitation.
The object of the present invention is achieved like this:
As Fig. 2, the present invention is on the basis of as shown in Figure 1 conventional Jet injector, be provided with automatic air supply device, this device comprises pressure transducer (9), PLC controller (10), contactor (11), main suction tude (12), normally open valve (13), solenoid valve (14);
Main suction tude (12) is arranged on the middle part of Jet injector trunnion (6), and main suction tude (12) is provided with normally open valve (13) and whether solenoid valve (14) controls air inlet; Solenoid valve (14) is connected with the 220V power supply, and its action is then controlled by PLC controller (10); The input end of PLC controller (10) is connected by the signaling line pressure transducer (or vibration transducer) (9) terminal with being installed in trunnion (6); The output terminal of PLC controller (10) is connected with contactor (11) in being installed in the 220V circuit by signaling line.
Working principle of the present invention is:
During proper functioning, the normally open valve door (13) on the main suction tude (12) is opened.Be installed in the size (or size of this place's ocsillator strenght of vibration transducer perception) of terminal this place's negative pressure of pressure transducer (9) perception of trunnion (6), and corresponding signal is imported PLC controller (10).
When cavitation took place, inner particularly its end of trunnion (6) was bigger negative pressure, and Jet injector produces very big vibration and noise simultaneously.In case the negative pressure of pressure transducer (9) installation site reaches setting value, the PLC controller (10) that then connects pressure transducer (9) input signal is by computing, send signal, connect coupled contactor (11), after contactor (11) action, the 220V power connection that is connected with solenoid valve (14), solenoid valve this moment (14) is opened, ambient air automatically is inhaled in the trunnion (6) by main suction tude (12) under suction function, move with the main flow direction downstream, at the peripheral one deck air cushion that forms of the terminal cavitation bubble of trunnion (6), the impact that this air cushion can reduce cavitation bubble greatly when crumbling and fall, thus reduce the noise and the vibration of Jet injector.
The present invention and conventional Jet injector difference are that the middle part of trunnion (6) is provided with main suction tude (12), and main suction tude (12) is provided with normally open valve door (13) and solenoid valve (14) is controlled the air that sucks trunnion (6) inside.Solenoid valve (14) is connected with the 220V power supply, and its action is then controlled by PLC controller (10).
The pressure transducer (9) of trunnion distal portion installing is imported PLC controller (10) with measured value, and PLC controller (10) compares input signal values and predefined value and determines whether triggering contactor (11).
During the Jet injector proper functioning, the measured value of pressure transducer (9) is less than predefined value, and PLC controller (10) does not send signal, and contactor (11) is failure to actuate, and solenoid valve (14) cuts out, and cut-out is drawn into trunnion (6) gas inside by suction tude (12) and flows.
In case Jet injector generation cavitation, produce violent vibration and noise, the very big negative pressure of the terminal generation of trunnion, then the measured value of sensor (9) is greater than predefined value, PLC controller (10) is through computing, send signal triggering contactor (11), the 220V power connection that is connected with solenoid valve (14), solenoid valve (14) is opened, ambient air sucks trunnion (6) inside automatically by main sucking pipe (12) under the effect of negative pressure, form air cushion, just can significantly reduce the vibration and the noise of Jet injector, thereby improve the cavitation performance of Jet injector.The measured value size of sensor this moment (9) revert to normal value, and through PLC controller (10) computing, do not send signal to contactor (11) this moment, and solenoid valve (14) continues to open, and gas continues to suck.
At this moment, if the Jet injector operating mode changes, then sensor (9) measured value also changes thereupon, in case it changes the size that size surpasses PLC controller (10) predetermined value, then PLC controller (10) sends signal to contactor (11), contactor (11) action, the 220V circuit disconnects, solenoid valve (14) cuts out because of dead electricity, and gas stops to suck, and Jet injector changes proper functioning over to.
Be installed in the normally open valve (13) on the main sucking pipe (12), can regulate the size that sucks gas flow by main sucking pipe (12).When can not normally cutting out, solenoid valve (14) can cut off main sucking pipe (12).
The present invention has following advantage and good effect:
1, only on the basis of conventional Jet injector, be provided with automatic air supply device, simple in structure, with low cost;
2, reliable operation can automatically also can be manual, and the vibration and the noise that are produced in the time of significantly reducing Jet injector generation cavitation improve the cavitation performance of Jet injector effectively.
3, owing to the price performance height, can be widely used among all kinds of liquid-jet pumps.
Description of drawings
Fig. 1 is the structural drawing of conventional Jet injector;
Fig. 2 is a structural drawing of the present invention;
Fig. 3 is PLC controller (a 10) structural drawing;
Fig. 4 is PLC controller (a 10) workflow diagram.
Wherein:
The 1-working water is taken over; 2-suction chamber 3-suction sleeve;
The 4-nozzle; 5-trunnion inlet duct; The 6-trunnion;
The 7-diffusing tube; The 8-outlet pipe; The 9-pressure transducer;
10-PLC controller (programmable controller),
(10.1-CPU central processing unit (CPU)), 10.2-A/D (analog-digital converter),
(10.3-DO switching value output module), the 10.4-power module;
The 11-contactor; 12-master's suction tude; The 13-normally open valve;
14-solenoid valve (normally closed); The 15-bypass valve; 16-bypass suction tude.
Embodiment
Further specify below in conjunction with drawings and Examples:
One, overall
As Fig. 2, the present invention is on the basis of conventional Jet injector, is provided with automatic air supply device.
Automatic air supply device comprises pressure transducer (9), PLC controller (10), contactor (11), main suction tude (12), normally open valve (13), solenoid valve (14);
* go up in main suction tude (12) and connected the bypass suction tude (16) that is provided with bypass valve (15) by three-way pipe.In case during Jet injector generation cavitation, 220V power supply dead electricity, or other fault appears, solenoid valve (14) can not normally be opened, ambient air can not be sucked by main sucking pipe (12), but manual unlocking bypass valve (15) then, ambient air can pass through bypass tube (16) equally to suck in the trunnion, thereby reduces the vibration and the noise of Jet injector.
The position of sound production of * main suction tude (12) is preferable at distance trunnion inlet about position of 1/4 to 3/4, end.Jet from the mobile similar crossing current of suction tude inhaled air trunnion flows, because the main flow flow velocity is higher, the gas of suction is very fast with the main flow direction downstream flow.If the position that suction tude is laid is too near apart from trunnion inlet end, the negative pressure that should locate when cavitation is little, and amount of air drawn is less, and can mix with main flow, and the effect of air cushion is limited; If the position that suction tude is laid is too far away apart from trunnion inlet end, inhaled air can flow into rapidly in the diffusing tube with main flow when cavitation, and the effect of the air cushion of generation is also undesirable.
Two, each parts
1, PLC controller (10)
PLC controller (10) is common programmable controller, and the listing product is arranged.
As Fig. 3, PLC controller (10) comprises CPU (10.1) and the A/D (10.2), the DO (10.3) that are connected with CPU (10.1), also has power module (10.4);
CPU (10.1) mainly carries out computing, decision-making to the pressure signal after the digitizing, and the output of control switch amount;
A/D (10.2) mainly gathers and is converted into digital quantity with the pressure that pressure transducer (9) is surveyed;
DO (10.3) is switching value output, and whether the triggering of major control trigger (11);
Power module (10.4) is mainly PLC controller (10) required working power is provided.
Above-mentioned PLC controller (10) also can be waited to substitute as single-chip microcomputer by other control apparatus with identical function.
As Fig. 4, the workflow of PLC controller (10) is:
1. start this device, set corresponding force value p
1, p
2And solenoid valve work time-delay t
0P wherein
1Be the breakout pressure of making-up air device, p
2For making-up air device starts the out-of-work pressure in back, t
0For making-up air device start after casual labourer do the time;
2. Jet injector is started working, pressure transducer (9) is gathered trunnion (6) terminal pressure value p, and with its input PLC controller (10), PLC controller (10) is through A/D (10.2) conversion, be digital quantity with the p value transform and in some cycles, average, obtain corresponding mean value p;
3. PLC controller (10) is with p value and setting value p
1Compare, if p＜p
1Promptly the terminal negative pressure value of Shi Ce trunnion (6) has been lower than setting value, the Jet injector cavitation is very serious, then PLC controller (10) detects the output state of DO (10.3), and passes through the output of DO (10.3), triggers contactor (11) work, the 220V power connection, solenoid valve (14) is opened, and ambient air sucks trunnion automatically through main suction tude (12) and normally open valve (13), and vibration that cavitation is brought out and noise obtain very big alleviating; In case solenoid valve (14) is opened, after ambient air sucked, trunnion (6) terminal pressure value p can recover to some extent, and greater than p
1For fear of the making-up air device perseveration, by the delay time t that sets
0, the output transition that keeps DO (10.3) is opened solenoid valve (14) always in this period, and tonifying Qi work is carried out always; In case the tonifying Qi time surpasses t
0, the sampling that then turns back to pressure signal reaches on average, repeats abovementioned steps;
If 4. p＞p
1, promptly because tonifying Qi recovers trunnion (6) terminal pressure to some extent, the terminal negative pressure value of the trunnion of actual measurement (6) is higher than setting value, and the Jet injector cavitation is not serious, then carries out p and p this moment
2Size relatively;
If 5. this moment p＜p
2, trunnion (6) terminal pressure does not reach tonifying Qi and stops pressure, and the sampling that then turns back to pressure signal reaches on average, and the state of contactor (11) and solenoid valve (14) is constant, and tonifying Qi is proceeded;
If 6. owing to change of external conditions, the running parameter of Jet injector changes, then may p＞p
2, illustrate that this moment, trunnion (6) terminal pressure was recovered better, detect and make the output change of DO (10.3) this moment, contactor (11) disconnects, and solenoid valve (12) cuts out, and tonifying Qi stops;
7. because tonifying Qi stops, the p value can descend again to some extent.At this moment, detect again again and relatively p and p
1Size, program is got back to second step of beginning, and works again and again, quits work up to Jet injector.
2, main suction tude (12) and bypass suction tude (16)
Main suction tude (12) and bypass suction tude (16) are the common metal pipe, and the listing product is arranged.
3, solenoid valve (14)
Solenoid valve (14) has the listing product for conventional zero-pressure starts the normally closed solenoid valve that can work under negative pressure.
4, pressure transducer (9)
Pressure transducer (9) is the usual pressure sensor, is output as standard 4～20mA current signal or 0～5V voltage signal, and the listing product is arranged.
5, contactor (11)
Contactor (11) is common contactor, and the listing product is arranged.
6, normally open valve (13) and bypass valve (15)
Normally open valve (13) and bypass valve (15) are common valve, and the listing product is arranged.
Claims (4)
1, a kind of automatic air supply device that reduces Jet injector cavitation vibration and noise comprises the conventional liq Jet injector;
It is characterized in that being provided with automatic air supply device, this device comprises pressure transducer (9), PLC controller (10), contactor (11), main suction tude (12), normally open valve (13), solenoid valve (14);
Main suction tude (12) is placed in apart from trunnion (6) inlet about position of 1/4 to 3/4, end;
Main suction tude (12) is provided with normally open valve (13) and whether solenoid valve (14) controls air inlet; Solenoid valve (14) is connected with the 220V power supply, and its action is then controlled by PLC controller (10); The input end of PLC controller (10) is connected by the signaling line pressure transducer (9) terminal with being installed in trunnion (6); The output terminal of PLC controller (10) is connected with contactor (11) in being installed in the 220V circuit by signaling line.
2, by the described automatic air supply device of claim 1, it is characterized in that:
Go up the bypass suction tude (16) that is connected with bypass valve (15) by three-way pipe in main suction tude (12).
3, by the described automatic air supply device of claim 1, it is characterized in that the structure of PLC controller (10) is:
Comprise CPU (10.1) and the A/D (10.2), the DO (10.3) that are connected with CPU (10.1), also have power module (10.4);
CPU (10.1) mainly carries out computing, decision-making to the pressure signal after the digitizing, and the output of control switch amount;
A/D (10.2) mainly gathers and is converted into digital quantity with the pressure that pressure transducer (9) is surveyed;
DO (10.3) is switching value output, and whether the triggering of major control trigger (11);
Power module (10.4) is mainly PLC controller (10) required working power is provided.
4,, it is characterized in that PLC controller (10) can be substituted by other control apparatus with identical function by the described automatic air supply device of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100528188A CN100516552C (en) | 2007-07-24 | 2007-07-24 | Automatic air supply device for reducing cavitation vibration and noise of jet pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100528188A CN100516552C (en) | 2007-07-24 | 2007-07-24 | Automatic air supply device for reducing cavitation vibration and noise of jet pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101092979A CN101092979A (en) | 2007-12-26 |
| CN100516552C true CN100516552C (en) | 2009-07-22 |
Family
ID=38991376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100528188A Expired - Fee Related CN100516552C (en) | 2007-07-24 | 2007-07-24 | Automatic air supply device for reducing cavitation vibration and noise of jet pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100516552C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9777748B2 (en) * | 2010-04-05 | 2017-10-03 | Eaton Corporation | System and method of detecting cavitation in pumps |
| CN102797552A (en) * | 2011-07-06 | 2012-11-28 | 摩尔动力(北京)技术股份有限公司 | Jet-mixed supercharged engine |
| CN103174497B (en) * | 2012-08-15 | 2015-09-16 | 苏州派格丽减排系统有限公司 | Reducing agent ejection control device in SCR system |
| CN103244468B (en) * | 2013-04-17 | 2015-11-04 | 武汉大学 | Injection type jet flow cavitation generator and cavitation cell breaking plant |
| CN106089818B (en) * | 2016-06-16 | 2018-02-09 | 北京工业大学 | It is a kind of from dynamic auxiliary injection type steam jet ejector |
| CN106438512A (en) * | 2016-11-08 | 2017-02-22 | 四川大学 | Ring-symmetry air supplementing device and method for reducing cavitation of liquid jet pump |
| CN106762860B (en) * | 2016-12-21 | 2018-07-24 | 武汉大学 | A kind of fluid flow built-in stabilizers based on jet flow cavitation |
| CN108612678B (en) * | 2018-04-20 | 2020-01-10 | 浙江理工大学 | Cavitation-resistant air supply device suitable for different cavitation areas of centrifugal pump |
-
2007
- 2007-07-24 CN CNB2007100528188A patent/CN100516552C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101092979A (en) | 2007-12-26 |
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Granted publication date: 20090722 Termination date: 20120724 |