CN111102112A - Marine monoblock pump chamber internal pressure adjusting structure - Google Patents

Marine monoblock pump chamber internal pressure adjusting structure Download PDF

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Publication number
CN111102112A
CN111102112A CN201911407216.9A CN201911407216A CN111102112A CN 111102112 A CN111102112 A CN 111102112A CN 201911407216 A CN201911407216 A CN 201911407216A CN 111102112 A CN111102112 A CN 111102112A
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CN
China
Prior art keywords
oil
plunger
pressure
hole
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911407216.9A
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Chinese (zh)
Inventor
欧阳玲湘
罗山刚
邓飞
龙美彪
黄民备
李少鹤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanyuediankong Hengyang Industrial Technology Co ltd
Original Assignee
Nanyuediankong Hengyang Industrial Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nanyuediankong Hengyang Industrial Technology Co ltd filed Critical Nanyuediankong Hengyang Industrial Technology Co ltd
Priority to CN201911407216.9A priority Critical patent/CN111102112A/en
Publication of CN111102112A publication Critical patent/CN111102112A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention discloses an internal pressure regulating structure of a pump cavity of a marine monoblock pump, which comprises a pump body, a plunger sleeve, a plunger, an oil outlet valve component, an oil outlet valve spring, a pressure relief valve spring, an oil outlet valve, an oil quantity pull rod, a plunger spring, an upper spring seat, a tappet body component and a lower spring seat, wherein an oil pump high-pressure cavity is arranged in a plunger hole, and an oil outlet hole, an oil drainage hole, an oil return hole and an oil inlet hole are arranged in the plunger sleeve; the plunger piston is characterized in that an oil supply chute is arranged on the peripheral surface of the plunger piston, an oil return hole and an oil inlet hole on the plunger piston sleeve are respectively provided with a pressure relief chute, when the pressure relief chute on the plunger piston sleeve is contacted with the oil supply chute on the plunger piston in the process of up-and-down movement of the plunger piston, the effect of releasing high-pressure fuel oil in a high-pressure cavity of an oil pump in the plunger piston sleeve is achieved on the premise of not influencing the oil supply amount, and the size of the high-pressure fuel oil release can be adjusted by adjusting the size of the pressure relief chute.

Description

Marine monoblock pump chamber internal pressure adjusting structure
Technical Field
The invention relates to the technical field of marine monoblock pumps, in particular to an internal pressure adjusting structure of a pump cavity of a marine monoblock pump.
Background
With the increasing requirements for environmental protection at home and abroad, the research on the emission and control of the exhaust gas of the diesel engine becomes a hotspot and difficult problem of the current diesel engine research. The latest modified MARPOL convention VI of International maritime organization IMO puts an increasingly strict requirement on NOx emission of marine diesel engines, and from 2011 and 1 month, the IMO TIER II emission regulation is enforced in all contracting national sea areas of IMO. The NOx emission in the TIER II stage is reduced by 16-20% compared with that in the TIER I stage, a large number of TIER II models are put on the market by various large marine diesel engine manufacturers in the standard world, and the TIER III stage regulation is forced to be implemented from 1 month and 1 day in 2016, the NOx emission is required to be reduced by 80% compared with that in the TIER I stage, which puts higher requirements on manufacturers and increasingly higher requirements on the injection pressure of an oil system. Based on the background, the invention discloses a single pump which utilizes the unique structural design that a plunger is sleeved in an oil return hole to realize the adjustment of the pressure of a pump cavity and can be flexibly matched with the implementation of an engine on different discharge requirements.
Disclosure of Invention
The invention aims to solve the problems that when the traditional plunger is sleeved in an oil return hole structure, the pump cavity pressure is too high, so that the reliability and sealing failure of moving parts of an oil pump assembly are caused, and the discharge requirement of an engine cannot be met due to too low pump cavity pressure, and provides an internal pressure regulating structure of the pump cavity of a marine monoblock pump.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a marine monoblock pump cavity internal pressure adjusting structure comprises a pump body, a plunger sleeve, a plunger, an oil outlet valve component, an oil outlet valve spring, a pressure release valve spring, an oil outlet valve, an oil mass pull rod, a plunger spring, an upper spring seat, a tappet body component and a lower spring seat, wherein the plunger sleeve, the oil mass pull rod, the plunger spring, the upper spring seat, the lower spring seat and the tappet body component are installed in an inner hole of the pump body from top to bottom; the oil outlet valve component is arranged on the top surface of the pump body, an oil outlet cavity and an oil drainage cavity are arranged in the oil outlet valve component, the oil outlet cavity is communicated with the oil pump high-pressure cavity through an oil outlet hole, the oil drainage cavity is communicated with the oil pump high-pressure cavity through an oil drainage hole, an oil outlet valve and an oil outlet valve spring are arranged in the oil outlet cavity, and a pressure release valve spring are arranged in the oil drainage cavity; an oil return hole and an oil inlet hole in the plunger sleeve are also communicated with the high-pressure cavity of the oil pump; the plunger is characterized in that an oil supply chute is arranged on the peripheral surface of the plunger, a pressure relief chute is respectively arranged on an oil return hole and an oil inlet hole on the plunger sleeve, when the pressure relief chute on the plunger sleeve is contacted with the oil supply chute on the plunger in the up-and-down movement process of the plunger, the function of releasing high-pressure fuel oil in a high-pressure cavity of an oil pump in the plunger sleeve is achieved on the premise that the oil supply amount is not influenced, and the size of the high-pressure fuel oil release can be adjusted by adjusting the size of the pressure relief chute.
Due to the adoption of the technical scheme, the plunger of the invention is driven by the cam of the cam shaft and is pushed back by the plunger spring to do reciprocating motion with a certain stroke in the plunger sleeve. When the plunger moves down to an oil inlet and return hole on the plunger sleeve and is communicated with a fuel oil cavity of the monoblock pump, fuel oil is sucked through the oil hole, and the suction is finished when the plunger reaches the bottom dead center. Then the camshaft rotates to compress the plunger spring, the plunger rises, and when the oil supply end face of the plunger seals the oil hole in the plunger sleeve, the fuel oil starts to be compressed to form fuel oil with certain pressure and then the fuel oil is sprayed into the cylinder body of the engine through the oil sprayer. The invention designs a pressure relief inclined hole on each of the oil inlet and return holes at two sides of the plunger sleeve, and plays a role in releasing high-pressure fuel oil in the plunger sleeve on the premise of not influencing the oil supply amount when the pressure relief inclined hole is contacted with the oil supply inclined groove of the plunger in the process of up-and-down movement of the plunger, and the size of the high-pressure fuel oil release can be adjusted by adjusting the size of the pressure relief hole.
Drawings
Fig. 1 is a schematic structural view of a mono-block pump for a ship according to the present invention.
Fig. 2 is a schematic view illustrating a state where an oil supply chute formed in a plunger in a marine monoblock pump according to the present invention is not in contact with a pressure relief chute formed in a plunger housing.
Fig. 3 is a schematic view illustrating a state in which an oil supply chute formed in a plunger in a unit pump for a ship of the present invention is in contact with a pressure release chute formed in a plunger housing.
Detailed Description
The invention is further illustrated with reference to the following figures and examples, without thereby restricting the invention to the described examples.
Referring to fig. 1, the pump cavity of the marine monoblock pump shown in the figure comprises a pump body 1, a plunger sleeve 2, a plunger 3, an oil outlet valve part 4, an oil outlet valve spring 5, a pressure release valve 6, a pressure release valve spring 7, an oil outlet valve 8, an oil quantity pull rod 10, a plunger spring 11, an upper spring seat 12, a tappet body part 13 and a lower spring seat 14, wherein the plunger sleeve 2, the oil quantity pull rod 10, the plunger spring 11, the upper spring seat 12, the lower spring seat 14 and the tappet body part 13 are installed in an inner hole 11a of the pump body 1 from top to bottom, the plunger 3 is installed in a plunger hole 2a in the plunger sleeve 2, and a plunger small end face 9 at the lower end of the plunger 3 is in contact with the.
An oil pump high-pressure cavity 2b is arranged in the plunger hole 2a, and an oil outlet hole 2c, an oil drain hole 2d, an oil return hole 2e and an oil inlet hole 2f are arranged in the plunger sleeve 2; the oil outlet valve component 4 is installed on the top surface of the pump body 1, an oil outlet cavity 4a and an oil drainage cavity 4b are arranged in the oil outlet valve component 4, the oil outlet cavity 4a is communicated with the oil pump high-pressure cavity 2b through an oil outlet hole 2c, the oil drainage cavity 4b is communicated with the oil pump high-pressure cavity 2b through an oil drainage hole 2d, an oil outlet valve 8 and an oil outlet valve spring 5 are arranged in the oil outlet cavity 4a, and a pressure release valve 6 and a pressure release valve spring 7 are installed in the oil drainage cavity 4 b; an oil return hole 2e and an oil inlet hole 2f in the plunger sleeve 2 are also communicated with the oil pump high-pressure cavity 2 b.
Referring to fig. 2 and 3, the present invention is characterized in that an oil supply chute 3a is provided on the outer circumferential surface of the plunger 3, and an oil return hole 2e and an oil inlet hole 2f on the plunger sleeve 2 are respectively provided with a pressure relief chute hole 2 g.
The plunger 3 moves downwards together through a tappet body part 13 connected with the plunger 3, fuel oil is sucked through an oil inlet hole 2 and an oil return hole 2e of the plunger sleeve 2 and fills an oil pump high-pressure cavity 2b, when the plunger 3 moves upwards until an oil supply end surface 3b at the top of the plunger 3 exceeds the oil inlet hole 2 and the oil return hole 2e of the plunger sleeve 2, the fuel oil in the oil pump high-pressure cavity 2b generates pressure to exceed the opening pressure of an oil outlet valve 8 in an oil outlet valve part 4, the fuel oil starts to be sprayed into an oil sprayer through an oil outlet hole 2c in the plunger sleeve 2 and the oil outlet valve 8 in an oil outlet cavity 4a in sequence, in the process of moving upwards along with the plunger 3, the volume of the oil pump high-pressure cavity 2b is compressed to be smaller and smaller, meanwhile, the fuel oil in the oil pump high-pressure cavity 2b is correspondingly compressed, when the plunger 3 moves upwards to a critical state that the oil supply chute 3a of the plunger 3 is contacted with the oil return hole 2e and an inclined hole 2g on, at this moment, a part of fuel pressure in the high-pressure cavity 2b of the oil pump can be released through the pressure relief inclined hole 2g, so that the size of the pressure relief inclined hole 2g at this moment is very small, the fuel is throttled, the fuel pressure in the high-pressure cavity is influenced at this moment, the fuel supply quantity value in the high-pressure cavity cannot be influenced, and the aperture and the inclination angle of the pressure relief hole can be adjusted to achieve the target value.

Claims (2)

1. A marine monoblock pump cavity internal pressure adjusting structure comprises a pump body, a plunger sleeve, a plunger, an oil outlet valve component, an oil outlet valve spring, a pressure release valve spring, an oil outlet valve, an oil mass pull rod, a plunger spring, an upper spring seat, a tappet body component and a lower spring seat, wherein the plunger sleeve, the oil mass pull rod, the plunger spring, the upper spring seat, the lower spring seat and the tappet body component are installed in an inner hole of the pump body from top to bottom; the oil outlet valve component is arranged on the top surface of the pump body, an oil outlet cavity and an oil drainage cavity are arranged in the oil outlet valve component, the oil outlet cavity is communicated with the oil pump high-pressure cavity through an oil outlet hole, the oil drainage cavity is communicated with the oil pump high-pressure cavity through an oil drainage hole, an oil outlet valve and an oil outlet valve spring are arranged in the oil outlet cavity, and a pressure release valve spring are arranged in the oil drainage cavity; an oil return hole and an oil inlet hole in the plunger sleeve are also communicated with the high-pressure cavity of the oil pump; the plunger is characterized in that an oil supply chute is arranged on the peripheral surface of the plunger, and an oil return hole and an oil inlet hole on the plunger sleeve are respectively provided with a pressure relief chute hole.
2. The internal pressure regulating structure of a pump chamber of a marine monoblock pump according to claim 1, wherein during the up-and-down movement of the plunger, when the inclined pressure relief hole of the plunger sleeve contacts the inclined oil supply groove of the plunger, the internal pressure regulating structure plays a role in discharging high-pressure fuel oil in the high-pressure chamber of the oil pump in the plunger sleeve without affecting the oil supply amount, and the size of the high-pressure fuel oil discharge can be regulated by regulating the size of the inclined pressure relief hole.
CN201911407216.9A 2019-12-31 2019-12-31 Marine monoblock pump chamber internal pressure adjusting structure Pending CN111102112A (en)

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Application Number Priority Date Filing Date Title
CN201911407216.9A CN111102112A (en) 2019-12-31 2019-12-31 Marine monoblock pump chamber internal pressure adjusting structure

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Application Number Priority Date Filing Date Title
CN201911407216.9A CN111102112A (en) 2019-12-31 2019-12-31 Marine monoblock pump chamber internal pressure adjusting structure

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Publication Number Publication Date
CN111102112A true CN111102112A (en) 2020-05-05

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CN201911407216.9A Pending CN111102112A (en) 2019-12-31 2019-12-31 Marine monoblock pump chamber internal pressure adjusting structure

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2440949Y (en) * 2000-09-08 2001-08-01 无锡威孚集团有限公司 Oil jetting pump
WO2010127613A1 (en) * 2009-05-04 2010-11-11 Hong Xuanmin In-line fuel pump plunger for diesel engine
WO2017028537A1 (en) * 2015-08-14 2017-02-23 江苏科技大学 Fuel injector for marine diesel engine
CN107905930A (en) * 2017-12-25 2018-04-13 南岳电控（衡阳）工业技术股份有限公司 A kind of heavy monoblock pump peculiar to vessel with anti-outer dripping structure
WO2018149333A1 (en) * 2017-02-20 2018-08-23 山东大学 Valve lift control device of hydraulic fully variable valve mechanism and internal combustion engine
CN211500854U (en) * 2019-12-31 2020-09-15 南岳电控（衡阳）工业技术股份有限公司 Marine monoblock pump chamber internal pressure adjusting structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2440949Y (en) * 2000-09-08 2001-08-01 无锡威孚集团有限公司 Oil jetting pump
WO2010127613A1 (en) * 2009-05-04 2010-11-11 Hong Xuanmin In-line fuel pump plunger for diesel engine
WO2017028537A1 (en) * 2015-08-14 2017-02-23 江苏科技大学 Fuel injector for marine diesel engine
WO2018149333A1 (en) * 2017-02-20 2018-08-23 山东大学 Valve lift control device of hydraulic fully variable valve mechanism and internal combustion engine
CN107905930A (en) * 2017-12-25 2018-04-13 南岳电控（衡阳）工业技术股份有限公司 A kind of heavy monoblock pump peculiar to vessel with anti-outer dripping structure
CN211500854U (en) * 2019-12-31 2020-09-15 南岳电控（衡阳）工业技术股份有限公司 Marine monoblock pump chamber internal pressure adjusting structure

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