CN201096083Y - Pressure medium delivery pump zero-pressure actuating apparatus - Google Patents
Pressure medium delivery pump zero-pressure actuating apparatus Download PDFInfo
- Publication number
- CN201096083Y CN201096083Y CNU2007200805364U CN200720080536U CN201096083Y CN 201096083 Y CN201096083 Y CN 201096083Y CN U2007200805364 U CNU2007200805364 U CN U2007200805364U CN 200720080536 U CN200720080536 U CN 200720080536U CN 201096083 Y CN201096083 Y CN 201096083Y
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- pressure
- pump
- controller
- zero
- control unit
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Abstract
The utility model discloses a zero-pressure starting device of a pressure medium delivery pump, which comprises a controller and a pressure release channel, wherein, the controller is provided with a pump motor control unit; the pressure release channel is arranged at a pump outlet, and the pressure release channel is provided with a pressure release valve; the controller is provided with a control unit of the pressure release valve. The pressure release valve adopts an electro-liquid control valve, and the controller adopts a timelag proportional regulator and the time period is 5 to 8 seconds. The zero-pressure starting device has the advantages that the trap pressure which exists in pipelines among a pump cavity, the reciprocating pump and a holding valve is eliminated when the reciprocating pump is standby; the pump is in a zero-backpressure state when the pump starts, and the severe overload is avoided when a motor starts; the rate of rise is reduced when pressure is supplemented, the holding valve is slowly pushed out, and the occurrence of transient liquid hammer is avoided.
Description
Technical field
The utility model relates to the starting drive of pump, relates in particular to a kind of zero-pressure starting drive of pressure medium transfer pump.
Background technique
In industrial production, often there is the pump band of some discharge pressure media to press startup, for example, the blowout prevention system that uses in oil, the gas well drilling process, oil pressure wherein must remain between 18.5MPa～21MPa, and preventer is by plunger type reciprocating pump fuel feeding, when low fuel pressure in the preventer during to 18.5MPa, reciprocating pump starts, to the oil-filled ftercompction of preventer, when pressure was raised to 21MPa, reciprocating pump stopped, so repeatedly, the preventer oil pressure is carried out dibit control.During the reciprocating pump standby, there is trap pressure in the pipeline between pump chamber and pump and the one-way valve, pump is in the high back pressure state, electric current is very big during startup, and chronic, and motor and match appliance thereof seriously transship, working life is short, even break down or burn, cause preventer to lose efficacy, gas blowout accident takes place easily.In addition, when reciprocating pump started ftercompction, because the volume between pump and the one-way valve is very little, and exists trap pressure, pressure rose very fast, and usually an one-shot will back down one-way valve, and the moment liquid hammer takes place preventer inner high voltage medium back flow, and system is caused damage.
Summary of the invention
Problem to be solved in the utility model is: 1. the trap pressure that exists in the pipeline when eliminating the reciprocating pump standby between pump chamber and pump and the one-way valve, be in zero back pressure state when making pump startup, and seriously transship when avoiding electric motor starting; 2. the rate of rise when reducing ftercompction is slowly backed down one-way valve, avoids taking place liquid hammer.
The technological scheme that the utility model addresses the above problem is:
A kind of pressure medium transfer pump zero-pressure starting drive comprises controller, and this controller has the pump motor control unit; Also comprise the pressure release passage that is arranged on pump discharge, this passage is provided with Decompression valves; Described controller has the control unit of this valve.
Described Decompression valves is an electro-hydraulic control valve.
The control unit of described Decompression valves adopts time-delay proportional controller, 5～8 seconds time cycles.
Described motor control unit adopts bang-bang circuit, and its control unit is a pressure relay, and its final controlling element is an A.C. contactor; Described pressure relay is the two-way pressure relay.
Described motor control unit also is provided with personal control.
The useful technique effect of this device:
1. the trap pressure that exists in the pipeline when having eliminated the reciprocating pump standby between pump chamber and pump and the one-way valve is in zero back pressure state when making pump startup, seriously transship when having avoided electric motor starting.
2. the rate of rise when having reduced ftercompction is slowly backed down one-way valve, can avoid taking place liquid hammer.
Description of drawings
Fig. 1 is the structured flowchart of this device and controlled system
Fig. 2 is the control principle figure of this device
Fig. 3 is control electricity, the liquid road figure of an example of this device
Embodiment
Referring to Fig. 1, Fig. 2: the preventer 1 of controlled system is provided with one-way valve 2 by pump 3 charged pressure oil between pump 3 and the preventer 1, prevents that pressure oil from refluxing.This zero-pressure start-up control device 4 is made up of controller 5, pressure detecting element 6, Decompression valves 7, wherein, Decompression valves 7 adopts electro-hydraulic control valve, is connected on the outlet of pump 3, pressure detecting element 6 is installed on the connecting tube between preventer 1 and the one-way valve 2, detects the pressure of preventer 1.Controller 5 comprises pump motor controller 8, is used for opening, stopping of control pump motor 9; Decompression valves controller 10 is used to control Decompression valves 7 and opens and closes.
The effect of Decompression valves 7 has two, and the one, when pump 3 was shut down, Decompression valves 7 all-pass was immediately directly opened, and laid down the trap pressure in the pipeline between pump chamber and pump 3 and the one-way valve 2, made pump 3 be in zero back pressure state standby, seriously transshipped when avoiding motor 9 to start.The 2nd, when pump 3 started, the Decompression valves 7 that is in opening state cut out gradually, and the oil that pumps is released, and just closed fully after 5～15 seconds time, reduced the rate of rise of pump discharge, slowly backed down one-way valve 2, avoided taking place liquid hammer.
The control gear of realizing above-mentioned functions can have multiple concrete structure, shown in Figure 3 is an example, and its pressure detecting element adopts dibit pressure relay YJ, and pressure set points is respectively 18.5MPa, 21MPa, as the on off controller of motor 9, executive component adopts A.C. contactor KM simultaneously.The keying of the solenoid controlled valve of Decompression valves 7 provides control signal corresponding by controller 10.Adopt the time-delay proportional control, output time-delay regulated signal, the aperture of control valve, the time constant of time-delay proportional control be 0～15 second adjustable, set general 5～8 seconds according to actual needs.
Its working procedure is: when low fuel pressure is to 18.5MPa in the blowout prevention system, 2～5 seconds closures of normally open contact time-delay of time relay KT1, the normally opened contact YJ1 closure of pressure relay YJ, ac contactor coil KM gets, its main contact KM1 closure, reciprocating pump 3 starts, to preventer 1 oil-filled ftercompction.At this moment, Decompression valves 7 is in opening state, and the oil of pump 3 outlets flows back to oil groove through Decompression valves 7; Decompression valves 7 cuts out in time gradually, aperture diminishes gradually, up to closing fully, pump 3 outlet oil pressure raise gradually, the normally closed interlock time-delay of time relay KT2 disconnected in 15 seconds, and the normally closed interlock time-delay of time relay KT3 disconnected in 5 seconds, like this, one-way valve 2 is slowly backed down, thereby avoids taking place liquid hammer.
When system pressure is raised to 21MPa, the normally opened contact YJ2 closure of pressure relay YJ, ac contactor coil KM power down, its main contact KM1 disconnects, and reciprocating pump 3 stops.At this moment, controller 10 output control signals, Decompression valves 7 all-pass is immediately directly opened, and lays down the trapped fuel in the pipeline between pump chamber and pump 3 and the one-way valve 2 rapidly, makes pump 3 be in zero back pressure state, prepares for starting next time.
The said process circulation is carried out, and realizes the pressure control of blowout prevention system.
In addition, also be provided with hand control switch among Fig. 3, for detecting, using when debugging.
Claims (7)
1. a pressure medium transfer pump zero-pressure starting drive comprises controller, and this controller has the pump motor control unit; It is characterized in that: also comprise the pressure release passage that is arranged on pump discharge, this passage is provided with Decompression valves; Described controller has the control unit of this valve.
2. pressure medium transfer pump zero-pressure starting drive according to claim 1, it is characterized in that: described Decompression valves is an electro-hydraulic control valve.
3. pressure medium transfer pump zero-pressure starting drive according to claim 1 is characterized in that: the control unit of described Decompression valves adopts the time-delay proportional controller.
4. pressure medium transfer pump zero-pressure starting drive according to claim 3 is characterized in that: 5～8 seconds time cycles of described time-delay proportional controller.
5. pressure medium transfer pump zero-pressure starting drive according to claim 1 is characterized in that: described pump motor control unit adopts bang-bang circuit, and its control unit is a pressure relay, and its final controlling element is an A.C. contactor.
6. pressure medium transfer pump zero-pressure starting drive according to claim 5, it is characterized in that: described pressure relay is the two-way pressure relay.
7. pressure medium transfer pump zero-pressure starting drive according to claim 5, it is characterized in that: described pump motor control unit also is provided with personal control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200805364U CN201096083Y (en) | 2007-08-03 | 2007-08-03 | Pressure medium delivery pump zero-pressure actuating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200805364U CN201096083Y (en) | 2007-08-03 | 2007-08-03 | Pressure medium delivery pump zero-pressure actuating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201096083Y true CN201096083Y (en) | 2008-08-06 |
Family
ID=39923136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200805364U Expired - Lifetime CN201096083Y (en) | 2007-08-03 | 2007-08-03 | Pressure medium delivery pump zero-pressure actuating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201096083Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493950A (en) * | 2011-12-01 | 2012-06-13 | 无锡新矿微控电子科技有限公司 | Pressure control system and method for no-load starting of emulsion pump |
| CN103727020A (en) * | 2014-01-21 | 2014-04-16 | 上海神开石油化工装备股份有限公司 | Zero-pressure starting device |
-
2007
- 2007-08-03 CN CNU2007200805364U patent/CN201096083Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493950A (en) * | 2011-12-01 | 2012-06-13 | 无锡新矿微控电子科技有限公司 | Pressure control system and method for no-load starting of emulsion pump |
| CN102493950B (en) * | 2011-12-01 | 2016-03-30 | 无锡煤矿机械股份有限公司 | A kind of control pressurer system of emulsion pump No Load Start and method |
| CN103727020A (en) * | 2014-01-21 | 2014-04-16 | 上海神开石油化工装备股份有限公司 | Zero-pressure starting device |
| CN103727020B (en) * | 2014-01-21 | 2016-06-08 | 上海神开石油化工装备股份有限公司 | A kind of zero voltage starting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080806 |
|
| CX01 | Expiry of patent term |