CN102444516A - Double-screw low-sulfur diesel injection pump - Google Patents
Double-screw low-sulfur diesel injection pump Download PDFInfo
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- CN102444516A CN102444516A CN2011103800128A CN201110380012A CN102444516A CN 102444516 A CN102444516 A CN 102444516A CN 2011103800128 A CN2011103800128 A CN 2011103800128A CN 201110380012 A CN201110380012 A CN 201110380012A CN 102444516 A CN102444516 A CN 102444516A
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Abstract
The invention relates to a double-screw low-sulfur diesel injection pump, comprising a pump body, a front cover and a rear cover of the pump body, a gear box, a driving screw, a driven screw and a safety valve. The double-screw low-sulfur diesel injection pump is characterized in that a left-rotating thread sleeve and a right-rotating thread sleeve of the screw are designed to be separated from a driving rod and a driven rod; and the screws adopt double outer support and high-pressure balance, and are provided with sealed leakage detecting tanks so as to be suitable for low-sulfur diesel transferring. Compared with the existing three-screw fuel injection pump, the double-screw low-sulfur diesel injection pump is more suitable for low-sulfur diesel transferring, not only can meet the requirements for poor fuel lubrication, high working pressure difference and long maintenance period, but also has the characteristics that the structure is compact and the small installation space of a fuel supplying unit can be met.
Description
[technical field]
The present invention relates to two screw pump, particularly a kind of to low-sulfur diesel-oil conveying in the marine fuel oil feed unit, two external supports that jet atomization is used, the single suction twin-screw low-sulfur diesel-oil jet pump of high pressure balance.
[background technique]
At present, in the marine fuel oil feed unit, generally adopt the jet pump of three screw pump as fuel-oil atmozation.In the past, marine main engine generally used ordinary diesel oil, because ordinary diesel oil has certain viscosity, can play lubrication preferably to the pumping element of three screw pump, selected for use three screw pump can satisfy usage requirement preferably.In recent years, along with the raising of environmental requirement, developed country has been strict with when boats and ships pull in to shore must use low-sulfur diesel-oil, to reduce the discharging of marine main engine sulfur dioxide.Because low-sulfur diesel-oil viscosity is very low, the pumping element of three screw pump there is not lubrication, this just sharply accelerates wearing and tearing of three screw pump pump element, the working life of greatly having reduced three screw pump.Though relevant three screw pump producer takes the whole bag of tricks to improve the abrasion resistance of three screw pump pumping element, but still satisfied not the requirement of boats and ships user far away to the three screw pump overhaul life.Therefore, the marine fuel oil feed unit is because of using low-sulfur diesel-oil, and causing the fuel injection three screw pump not reach expected service life is a difficult problem of being badly in need of solution.
Directly contact between its pumping element when working according to two screw pump, and pumping element do not need the lubricated characteristic of pumped medium, the present invention has designed a kind of unlubricated property of medium, twin-screw low-sulfur diesel-oil jet pump that operating pressure differential is high of being applicable to.
[summary of the invention]
The objective of the invention is in order to overcome the deficiency of existing technology; And a kind of twin-screw low-sulfur diesel-oil jet pump is provided; This twin-screw low-sulfur diesel-oil jet pump is the hydraulic axial power high pressure balance in the two external supports of master and slave screw rod, high low pressure chamber; And have seal leakage detection jar, be suitable for low-sulfur diesel-oil and carry.
The present invention be address the above problem the scheme that is adopted be the design a kind of twin-screw low-sulfur diesel-oil jet pump.It comprises the pump housing, the forward and backward lid of the pump housing, and gear-box, master and slave screw rod and safety valve is characterized in that said master and slave screw rod by driving lever, follower lever and the left-handed thread sleeve that is set with above that, right-handed thread sleeve are formed; Driving lever in the said master and slave screw rod and follower lever are the external support form; Block bearing lays respectively at the two ends of driving lever and follower lever; And between the left-handed thread sleeve and right-handed thread sleeve and block bearing of the hyperbaric chamber end of driving lever and follower lever, a mechanical seal is housed respectively; At the low pressure chamber end of driving lever and follower lever, the end of said driving lever and follower lever dress respectively has an annular balance ring, with separating between low pressure chamber and the pump housing bonnet chamber, and passes through balance tube pump housing bonnet chamber is linked to each other with hyperbaric chamber; The leakage chamber of said mechanical seal is connected with a mechanical seal leakage and detects jar.
The present invention compares with existing three screw rod fuel oil injectionpumps and is more suitable for the low-sulfur diesel-oil conveying, can satisfy the requirement that fuels lubricity is poor, operating pressure differential high, service cycle is long, has compact structure again, can satisfy the narrow and small characteristics of fuel delivery unit installing space.Particularly:
1. it is lubricated that pumping element need not pumped medium, to the viscosity wide accommodation of pumped medium.
2. do not contact between pumping element, do not have to be in contact with one another wearing and tearing the pumping element long service life.
3. adopt the high pressure balancing technique, reduce the positioning bearing specification, compact structure, volume are light and handy.
4. left and right swivel nut and the driving and driven bar separate design of revolving, axle is that rigidity is strong, and stock utilization is high, and processing technology is good, low cost of manufacture, maintenance cost is low.
5. be equipped with mechanical seal leakage and detect jar, the ability on-line monitoring is realized preventive maintenance, and is safe.
[description of drawings]
Fig. 1 is a twin-screw low-sulfur diesel-oil jet pump plan view;
Fig. 2 cuts open figure for twin-screw low-sulfur diesel-oil jet pump master.
Fig. 3 detects jar main figure that cuts open for mechanical seal leakage.
Among the figure: 1-pump housing; 2-protecgulum; 3-bonnet; 4-gear-box; 5-driving lever; 6-follower lever; 7-left-handed thread sleeve; 8-right-handed thread sleeve; 9-left-handed gear; 10-dextrorotation gear; 11-gimbal; 12-positioning bearing; 13-preceding block bearing; 14-rear trunnion holds; 15-balance tube; 16-safety valve; 17-mechanical seal leakage detects jar; 18-mechanical seal; 19-footing; 20-liquid storage tank; 21-liquid level sensor; 22-air-strainer; A-hyperbaric chamber; B-low pressure chamber.
Be described in detail with reference to accompanying drawing below in conjunction with embodiments of the invention.
[embodiment]
Twin-screw low-sulfur diesel-oil jet pump of the present invention is by the pump housing, the forward and backward lid of the pump housing, gear-box, compositions such as master and slave screw rod and safety valve.Wherein: said master and slave screw rod is by driving lever, the pumping element that follower lever and the left-handed thread sleeve that is set with above that, right-handed thread sleeve are formed.A pair of synchromesh gear (left-handed gear and dextrorotation gear) is housed on driving lever and the follower lever, and this synchromesh gear is in order to transmit driving lever, and the power on the follower lever is not in contact with one another between intermeshing spiral when guaranteeing pump work.Driving lever in the said master and slave screw rod and follower lever are the external support form, and block bearing lays respectively at the outside of driving lever and follower lever screw-casing, with the rigidity of raising rotatingshaft and the stationarity of pump operation.And between the left-handed thread sleeve and right-handed thread sleeve and block bearing of the hyperbaric chamber end of driving lever and follower lever, a mechanical seal is housed respectively.Low pressure chamber end at driving lever and follower lever; The end dress of said driving lever and follower lever respectively has an annular balance ring; With separating between low pressure chamber and the pump housing bonnet chamber, and the fluid of pump hyperbaric chamber A is caused the outside of this gimbal, the hydraulic axial power that when working with ballast pump rotatingshaft is produced through balance tube; Reduce the axial force that positioning bearing bears on the rotatingshaft, improve the working life of positioning bearing.The leakage chamber of said mechanical seal is connected with a mechanical seal leakage and detects jar, realizes the real-time detection function to the mechanical seal working state.
Described driving lever and follower lever also respectively are equipped with a positioning bearing in the block bearing outside of power intake, and principal and subordinate's bar is carried out axially locating, bear the axial force that synchromesh gear produces simultaneously.
The annulus end area of the annular balance ring that be equipped with the end of described driving lever and follower lever equates with the axial projective area of left-handed screw-casing and right hand helix cover.
Described balance tube can be built-in or external.
It can be a hydrostatic column that described mechanical seal leakage detects jar, is provided with liquid level sensor in it, and this jar is open type, or sealed mode.
Described safety valve can be straight ejector half, or type pilot.
Described block bearing can be a rolling bearing, or sliding bearing.
Described positioning bearing can be 4 ball bearings, or double-row angular contact bal bearing.
The external supporting two screw pump of single suction bilateral shown in the accompanying drawing 1-3 by the pump housing 1, protecgulum 2, bonnet 3, gear-box 4, driving lever 5, follower lever 6, left-handed thread sleeve 7, right-handed thread sleeve 8, left-handed gear 9, dextrorotation gear 10, gimbal 11, positioning bearing 12, preceding block bearing 13, rear trunnion hold 14, balance tube 15, safety valve 16, mechanical seal leakage detect jars 17, mechanical seal 18 and footing 19 etc. constitute.Wherein:
The profile of the pump housing 1 is to be dolioform; Be provided with import in a symmetrical arrangement and outlet in the both sides of axis; Be provided with in the above and below and be symmetric arrangement; In order to the plane boss of safety valve and lower margin to be installed, in set inside the screw-casing mounting hole of the figure of eight is arranged, be provided with the divider wall of pump being imported and exported isolation around the outer wall in " 8 " word hole.
Gimbal 11 is a kind of circular ring-shaped members; Its annulus area equates with the screw-casing axial projective area; Be installed in the end of driving lever and follower lever low voltage side respectively, the hydraulic axial power that on screw-casing, produces when working in order to ballast pump reduces the suffered axial force of positioning bearing.
Balance tube 15 is thin-wall circular tubes, and its endoporus area should equate with formed slit, bonnet assembling back area with two gimbals, in order to pump housing hyperbaric chamber pressure is caused the back side of gimbal.
It is cylinders of closed at both ends that mechanical seal leakage detects jars 17, and the leakage chamber through steel pipe and mechanical seal links.It mainly is made up of liquid storage tank 20, liquid level sensor 21 and air-strainer 22 etc., can realize the collection and the mechanical seal leakage warning function of mechanical seal leakage liquid.
When pump work, power is by driving lever 5 input, is delivered to follower lever 6 through left-handed gear 9, dextrorotation gear 10, drives left-handed thread sleeve 7, right-handed thread sleeve 8 is done the synchromesh campaign.At this moment; Medium gets into pump housing low pressure chamber B from the inlet of the pump housing 1; Get into the figure of eight screw-casing mounting hole of the pump housing 1 then from low pressure chamber, the hyperbaric chamber A of the pump housing 1 that is transferred vertically along with relatively rotating of left-handed thread sleeve 7, right-handed thread sleeve 8 discharges the pump housing through the outlet of the pump housing 1 then.Mechanical seal 18 is isolated medium in the pump housing 1 hyperbaric chamber and driving lever 5 with follower lever 6, prevent that medium from leaking.Balance tube 15 causes that with the medium of the pump housing 1 hyperbaric chamber in the cavity of bonnet 3, high-pressure medium acts on the back side of gimbal 11 simultaneously, acts on the hydraulic axial on the screw-casing 7,8 with the medium of offsetting the pump housing 1 hyperbaric chamber.
The inlet/outlet of safety valve 16 respectively with the high and low pressure chamber UNICOM of the pump housing 1; The cracking pressure of safety valve configures when pumping factory; When delivery side of pump pressure is higher than the pressure of safety valve 16 settings; Safety valve 16 is opened, and the pressure of the pump housing 1 hyperbaric chamber is discharged to the low pressure chamber of the pump housing 1, prevents the infringement of superpressure to pump; Seal leakage detects jar 17 and is communicated with the leakage chamber of mechanical seal through steel pipe; When mechanical seal 18 is leaked because of wearing and tearing or fault; The steel pipe that leakage fluid can be connected with the sealing detection jar through the leakage chamber of mechanical seal gets into the liquid storage tank 20 that seal leakage detects jar; Medium in liquid storage tank 20 can slowly increase, and seal leakage detects in the jar 17 liquid level sensor 21 is installed, and liquid level sensor 21 has configured the permission height of liquid level in the liquid storage tank; When the liquid level in the liquid storage tank 20 accumulates to the height of liquid level sensor setting; Liquid level sensor can continue to send alarm signal, reminds maintenance, thereby realizes real-time detection, the warning function of mechanical seal leakage state.
Claims (8)
1. a twin-screw low-sulfur diesel-oil jet pump comprises the pump housing, the forward and backward lid of the pump housing, and gear-box, master and slave screw rod and safety valve is characterized in that said master and slave screw rod by driving lever, follower lever and the left-handed thread sleeve that is set with above that, right-handed thread sleeve are formed; Driving lever in the said master and slave screw rod and follower lever are the external support form; Block bearing lays respectively at the two ends of driving lever and follower lever; And between the left-handed thread sleeve and right-handed thread sleeve and block bearing of the hyperbaric chamber end of driving lever and follower lever, a mechanical seal is housed respectively; At the low pressure chamber end of driving lever and follower lever, the end of said driving lever and follower lever dress respectively has an annular balance ring, with separating between low pressure chamber and the pump housing bonnet chamber, and passes through balance tube pump housing bonnet chamber is linked to each other with hyperbaric chamber; The leakage chamber of said mechanical seal is connected with a mechanical seal leakage and detects jar.
2. twin-screw low-sulfur diesel-oil jet pump according to claim 1; It is characterized in that said driving lever and follower lever the block bearing outside at power intake; A positioning bearing also respectively is housed, principal and subordinate's bar is carried out axially locating, bear the axial force that synchromesh gear produces simultaneously.
3. twin-screw low-sulfur diesel-oil jet pump according to claim 1 and 2 is characterized in that the annulus end area of the annular balance ring that be equipped with the end of said driving lever and follower lever equates with the axial projective area of left-handed screw-casing and right hand helix cover.
4. twin-screw low-sulfur diesel-oil jet pump according to claim 1 and 2 is characterized in that said balance tube is built-in or external.
5. twin-screw low-sulfur diesel-oil jet pump according to claim 1 and 2 is characterized in that it is a hydrostatic column that said mechanical seal leakage detects jar, is provided with liquid level sensor in it, and this jar is open type, or sealed mode.
6. twin-screw low-sulfur diesel-oil jet pump according to claim 1 and 2 is characterized in that said safety valve is straight ejector half, or type pilot.
7. twin-screw low-sulfur diesel-oil jet pump according to claim 1 and 2 is characterized in that said block bearing is a rolling bearing, or sliding bearing.
8. twin-screw low-sulfur diesel-oil jet pump according to claim 1 and 2 is characterized in that said positioning bearing is 4 ball bearings, or double-row angular contact bal bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103800128A CN102444516A (en) | 2011-11-25 | 2011-11-25 | Double-screw low-sulfur diesel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103800128A CN102444516A (en) | 2011-11-25 | 2011-11-25 | Double-screw low-sulfur diesel injection pump |
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| Publication Number | Publication Date |
|---|---|
| CN102444516A true CN102444516A (en) | 2012-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103800128A Pending CN102444516A (en) | 2011-11-25 | 2011-11-25 | Double-screw low-sulfur diesel injection pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074748A (en) * | 2013-03-28 | 2014-10-01 | 上海诺科泵业有限公司 | Single-suction 2G screw pump shell |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2816411Y (en) * | 2005-04-06 | 2006-09-13 | 天津市瑞德螺杆泵制造技术有限公司 | Single-suction doubleside externally supported double screw pump |
| CN201228638Y (en) * | 2008-02-26 | 2009-04-29 | 袁道幸 | A kind of cantilever type two screw pump |
| CN201396267Y (en) * | 2009-03-30 | 2010-02-03 | 上海天敏自动化仪表有限公司 | Enhanced type pump seal leakage detecting device |
| CN201671811U (en) * | 2010-05-27 | 2010-12-15 | 黄山工业泵制造有限公司 | Medium- and low-voltage two-screw pump |
-
2011
- 2011-11-25 CN CN2011103800128A patent/CN102444516A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2816411Y (en) * | 2005-04-06 | 2006-09-13 | 天津市瑞德螺杆泵制造技术有限公司 | Single-suction doubleside externally supported double screw pump |
| CN201228638Y (en) * | 2008-02-26 | 2009-04-29 | 袁道幸 | A kind of cantilever type two screw pump |
| CN201396267Y (en) * | 2009-03-30 | 2010-02-03 | 上海天敏自动化仪表有限公司 | Enhanced type pump seal leakage detecting device |
| CN201671811U (en) * | 2010-05-27 | 2010-12-15 | 黄山工业泵制造有限公司 | Medium- and low-voltage two-screw pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074748A (en) * | 2013-03-28 | 2014-10-01 | 上海诺科泵业有限公司 | Single-suction 2G screw pump shell |
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Application publication date: 20120509 |