CN111828203A - Gas jet valve of low-speed machine for ship - Google Patents
Gas jet valve of low-speed machine for ship Download PDFInfo
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- CN111828203A CN111828203A CN202010593785.3A CN202010593785A CN111828203A CN 111828203 A CN111828203 A CN 111828203A CN 202010593785 A CN202010593785 A CN 202010593785A CN 111828203 A CN111828203 A CN 111828203A
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
- F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
A gas jet valve of a marine low-speed engine comprises a valve cover, a valve shell, an intermediate body, a needle valve body, a connecting nut, a nozzle, a hydraulic piston, a thrust block assembly, a check valve assembly, a plunger assembly, a spring assembly and a needle valve; the valve cover, the valve casing, the intermediate body and the needle valve body are fixedly connected in sequence from top to bottom, the valve casing is provided with a gas cavity, the hydraulic piston is installed in an inner cavity of the valve casing, the check valve assembly is installed in the hydraulic piston, the needle valve body is internally provided with the needle valve body gas cavity and a control oil cavity, the needle valve is installed in the needle valve body, the nozzle is fixed at the lower part of the needle valve body through a connecting nut, and a gas channel, a hydraulic oil channel and a control oil channel are arranged in; the gas pushes the check valve assembly to be opened through the gas channel, the check valve assembly enters and is filled in the gas cavity, the hydraulic piston is pushed to move downwards through the hydraulic oil channel by hydraulic oil, the pressure of the gas in the gas cavity is increased, the gas enters the needle valve body gas cavity, the control oil enters the control oil cavity through the control oil channel, the needle valve is pushed to be opened, and the gas in the needle valve body gas cavity enters the nozzle and is sprayed outwards. The invention has the characteristics of high injection pressure, safety, reliability, easy control, good atomization effect and the like, and can be widely applied to the marine liquefied petroleum gas dual-fuel diesel engine.
Description
Technical Field
The invention relates to a part for combustion of a large marine dual-fuel diesel engine, in particular to a fuel gas jet valve of a marine low-speed engine, and belongs to the technical field of marine diesel engines.
Background
With the development of scientific technology and stricter policies of the international society on environmental protection, the emission requirements of ships are higher and higher, and then the dual-fuel diesel engine is produced. The dual-fuel diesel engine has the characteristics of low exhaust gas emission, low particulate matter emission, good economy and the like, and is one of the main development trends of future diesel engines. The existing dual-fuel diesel engine mainly comprises the following dual fuels: liquefied petroleum gas plus diesel oil, liquefied methanol plus diesel oil, natural gas plus diesel oil, and ethane plus diesel oil. The injection of these fuels into the combustion chamber for combustion is carried out via an injection valve.
The function of the gas injection valve is to inject fuel in the form of gas under a certain pressure into the combustion chamber. Due to the different physical and chemical properties of different fuels, different gas injection valves are required for dual-fuel diesel engines using different fuels. At present, no gas jet valve suitable for liquefied petroleum gas and diesel oil dual fuel exists.
Disclosure of Invention
The invention aims to fill the blank of the prior art, and provides a gas jet valve of a low-speed machine for a ship, which is used for a marine diesel engine burning liquefied petroleum gas and diesel oil double fuels, meets the requirements of the double-fuel diesel engines with various cylinder diameters and different numbers of cylinders, and achieves the effects of strong universality, convenient control, high safety, good atomization effect and the like.
Based on the above purpose, the technical scheme provided by the invention is as follows:
a fuel gas jet valve of a marine low-speed engine is arranged on a dual-fuel diesel engine using liquefied petroleum gas, and comprises a valve cover, a valve shell, an intermediate body, a needle valve body, a connecting nut, a nozzle, a hydraulic piston, a thrust block component, a check valve component, a plunger component, a spring component and a needle valve;
the valve shell is a hollow cylindrical component, a hydraulic oil cavity is arranged at the upper part of the inner cavity, a gas cavity is arranged at the lower part of the inner cavity, a gas inlet is arranged outside the valve shell, an upper gas hole, a valve shell gas hole and a control oil hole are arranged inside the valve shell, the upper gas hole is communicated with the gas inlet, and the upper end of the valve shell gas hole is communicated with the gas cavity;
the valve cover is fixed on the upper part of the valve shell, a hydraulic oil hole is arranged in the valve cover, an opening at the top end of the hydraulic oil hole is a hydraulic oil inlet, the lower end of the hydraulic oil hole is communicated with a hydraulic oil cavity of the valve shell, and a control oil inlet communicated with a control oil hole of the valve shell is also arranged on the valve cover;
the middle body is a cylinder with a hollow inner part and is fixedly arranged below the valve shell, a middle body first gas hole and a middle body control oil hole are arranged in the middle body, the upper end of the middle body first gas hole is communicated with the valve shell gas hole of the valve shell, and the upper end of the middle body control oil hole is communicated with the control oil hole of the valve shell;
the needle valve body is of a boss-shaped hollow structure and is fixedly connected below the intermediate body, a control oil cavity, a needle valve body gas cavity, a needle valve body first gas hole and a needle valve body control oil hole are formed in the needle valve body, the upper end of the needle valve body first gas hole is communicated with the intermediate body first gas hole of the intermediate body, the lower end of the needle valve body first gas hole is communicated with the needle valve body gas cavity, the upper end of the needle valve body control oil hole is communicated with the intermediate body control oil hole of the intermediate body, and the lower end of the needle valve body control oil hole is communicated with the control oil cavity;
the nozzle is screwed and fixed at the lower part of the needle valve body through the connecting nut and is communicated with the needle valve body gas cavity, and the lower end of the nozzle is provided with a gas orifice;
the hydraulic piston is cylindrical and is arranged in the inner cavity of the valve shell and can move up and down, the head of the hydraulic piston is arranged in the hydraulic oil cavity, a piston ring is arranged in a ring groove of the head and is in sealing contact with the inner wall of the hydraulic oil cavity, the lower part of the hydraulic piston is provided with a piston gas cavity and a piston gas hole which are transversely communicated, the upper end of the piston gas hole is communicated with the piston gas cavity, and the lower end of the piston gas hole is communicated with the gas cavity of the valve shell;
the check valve assembly is arranged in a piston gas hole at the lower part of the hydraulic piston to control the unidirectional passing of gas; the upper end of the thrust block assembly is connected to the lower part of the valve casing through threads, the lower end of the thrust block assembly penetrates into the intermediate body, and the plunger assembly is installed at the lower part in the valve casing and is positioned above the thrust block assembly; the spring assembly is arranged in the middle body and is positioned below the thrust block assembly;
the needle valve is arranged in the needle valve body and can move up and down, the needle valve is positioned below the spring assembly and is pressed downwards by the spring assembly, and a sealing surface is formed by a conical surface at the lower part of the needle valve and an inner conical surface of the needle valve body;
gas enters the piston gas cavity of the hydraulic piston from the gas inlet through the upper gas hole and then pushes the check valve assembly to be opened downwards through the piston gas hole, and the gas enters and fills the gas cavity; hydraulic oil is introduced into the hydraulic oil hole through the hydraulic oil inlet, the hydraulic piston is pushed to move downwards, gas in the gas cavity is compressed to increase the pressure to a certain value, the plunger assembly is pushed to open downwards, and the gas enters the needle valve body gas cavity through the valve shell gas hole, the intermediate body first gas hole and the needle valve body first gas hole in sequence; and control oil enters the control oil cavity from the control oil inlet sequentially through the control oil hole, the intermediate control oil hole and the needle valve body control oil hole, the needle valve is pushed to be opened upwards by the control oil with the pressure higher than that of gas, and the gas in the needle valve body gas cavity enters the nozzle and is sprayed outwards from the gas spraying hole.
As a further improvement, the upper part of the valve cover is also provided with a sealing oil inlet, the interior of the valve shell is also provided with an upper sealing oil hole, a lower sealing oil hole and a sealing oil ring groove, and the interior of the intermediate body is provided with a sealing oil cavity; the upper end of the upper sealing oil hole is communicated with the sealing oil inlet, the lower sealing oil hole and the sealing oil ring groove are respectively communicated with the upper sealing oil hole, the sealing oil ring groove is arranged on the wall of the inner cavity of the valve shell and surrounds the periphery of the hydraulic piston, and the sealing oil cavity is communicated with the lower sealing oil hole;
the sealing oil enters the gas jet valve from the sealing oil inlet and then is divided into two paths: one path of the oil passes through the upper sealing oil hole and the sealing oil ring groove to reach the contact surface of the valve shell and the hydraulic piston, so that the lubricating and sealing effects are achieved; and the other path of the oil reaches the sealed oil cavity through the upper sealed oil hole and the lower sealed oil hole, and plays a role in lubricating the needle valve.
As a further improvement, a gas leakage detecting port and a gas return port are arranged outside the valve casing, a gas detecting hole and a lower gas hole are also arranged inside the valve casing, an intermediate body second gas hole is also arranged inside the intermediate body, and a leakage gas cavity and a needle valve body second gas hole are also arranged inside the needle valve body;
the upper end of the lower gas hole is connected with the gas inlet, and the lower end of the lower gas hole is communicated with the intermediate body second gas hole, the needle valve body second gas hole and the leaked gas cavity in sequence so as to recycle the gas leaked from the gap between the needle valve and the needle valve body; one end of the gas detection hole is connected with the gas leakage detection port, and the other end of the gas detection hole is opened at the lower end face of the valve shell and used for discharging leaked gas between the valve shell and the connecting face of the intermediate body; the gas return port is communicated with the gas cavity and is used for blowing out gas in the valve when the gas jet valve stops using.
As a further improvement, the outer part of the shell is also provided with a hydraulic oil release port which is communicated with the hydraulic oil cavity and used for discharging hydraulic oil leaked from the piston ring.
As a further improvement, a plurality of annular grooves are distributed on the periphery of the valve shell, valve shell wear-resisting rings and sealing rings are arranged in the annular grooves, annular grooves are arranged outside the intermediate body, intermediate wear-resisting rings are arranged in the annular grooves, sealing grooves are arranged outside the needle valve body, and sealing rings are arranged in the annular grooves; the seal ring forms a seal structure, and the valve casing wear-resisting ring and the intermediate wear-resisting ring play a role in bearing wear.
As a further improvement, the travel distance of the needle valve is determined by the distance between the needle valve and the thrust block assembly.
Compared with the prior art, the invention achieves the following effects:
1) the gas jet valve is specially used for injecting liquefied petroleum gas, and fills the blank in the field.
2) The dual-fuel diesel engine has strong universality and can meet the requirements of dual-fuel diesel engines with different cylinder diameters and various cylinder numbers.
3) The gas jet valve has high jet pressure and good atomization effect.
4) The invention adopts a plurality of sealing rings, can effectively prevent the gas leakage and the leakage of fuel gas (liquefied petroleum gas) and hydraulic oil, and ensures the operation safety.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a sectional view H-H of fig. 1.
Fig. 3 is a structural schematic view of the valve cover.
Fig. 4 is a cross-sectional view of the valve cover.
Fig. 5 is one of the structural schematic views of the valve housing.
Fig. 6 is a second schematic structural view of the valve housing.
FIG. 7 is a schematic of the structure of an intermediate.
Fig. 8 is a schematic structural view of the needle valve body.
Fig. 9 is a schematic view of the structure of the nozzle.
Fig. 10 is a schematic view of the coupling nut.
Fig. 11 is a schematic structural view of a hydraulic piston.
Fig. 12 is a cross-sectional view taken along line K-K of fig. 11.
FIG. 13 is a schematic view of the check valve assembly construction.
FIG. 14 is a schematic structural view of a thrust block assembly.
Fig. 15 is a schematic structural view of the plunger assembly.
Fig. 16 is a schematic view of the structure of the spring assembly.
FIG. 17 is a schematic view of the structure of the needle valve.
Fig. 18 is a schematic view of a valve housing wear ring construction.
Figure 19 is a schematic of the structure of the intermediate wear ring.
Fig. 20 is a schematic view of a gas passage and a hydraulic oil passage.
Fig. 21 is a cross-sectional view M-M of fig. 20.
Fig. 22 is a schematic view of the control oil passage and the seal oil passage.
Fig. 23 is a cross-sectional view N-N of fig. 22.
In the figure:
1-valve cover, 2-valve casing, 3-intermediate body, 4-needle valve body, 5-nozzle, 6-connecting nut, 7-screw plug, 8-valve cover fastening bolt, 9-fixing bolt, 10-positioning pin, 11-thrust block component, 12-hydraulic piston, 13-check valve component, 14-plunger component, 15-spring component, 16-needle valve, 17-valve casing wear-resisting ring, 18-intermediate body wear-resisting ring, 19-sealing ring, 20-piston ring;
101-hydraulic oil hole, 102-upper gas hole, 103-piston gas hole, 104-valve housing gas hole, 105-intermediate body first gas hole, 106-needle valve body first gas hole, 107-detection gas hole, 108-lower gas hole, 109-intermediate body second gas hole, 110-needle valve body second gas hole, 111-upper sealing oil hole, 112-sealing oil ring groove, 113-lower sealing oil hole, 114-control oil hole, 115-intermediate body control oil hole, 116-needle valve body control oil hole;
the hydraulic control system comprises a-a hydraulic oil inlet, B-a control oil inlet, C-a sealing oil inlet, D-a hydraulic oil discharge port, E-a gas inlet, F-a gas leakage detection port, G-a gas return port, j-an air injection port, A-a hydraulic oil cavity, B-a piston gas cavity, C-a gas cavity, D-a needle valve body gas cavity, E-a leakage gas cavity, F-a sealing oil cavity and G-a control oil cavity.
Detailed Description
The present invention is further illustrated with reference to the following figures and specific examples, which are not intended to limit the scope of the invention as claimed.
The invention provides a gas jet valve for a large low-speed dual-fuel diesel engine, which burns liquefied petroleum gas and diesel. The gas jet valve mainly comprises the following three parts: a fixed structural component, a moving component, and a seal. The fixed structural component is the base member of the present invention and forms a plurality of internal cavities with the moving component. The moving parts are arranged inside the fixed structural part and can be matched with each other to eject a certain amount of fuel gas under a certain condition. The sealing elements are arranged between the fixed structural components and between the moving component and the fixed structural components, so that relative sealing of the cavities is ensured.
The fixing structural component forms an overall frame of the gas jet valve, is a structural foundation, is internally provided with a plurality of gas channels, hydraulic oil channels, control oil channels and sealing oil channels, and please refer to fig. 1 and fig. 2 in combination, and comprises a valve cover 1, a valve casing 2, a middle body 3, a needle valve body 4, a connecting nut 6, a nozzle 5, a thrust block assembly 11, a screw plug 7, a valve cover fastening bolt 8, a fixing bolt 9 and a positioning pin 10.
Referring to fig. 1 and 2 in combination, the moving parts include a hydraulic piston 12, a check valve assembly 13, a plunger assembly 14, a spring assembly 15, and a needle valve 16. The seal comprises a piston ring 20, a thirteen-piece seal ring 19, a valve housing wear ring 17 and an intermediate wear ring 18.
Referring to fig. 2, 3 and 4, the valve cap 1 is mounted on the top of the gas injection valve, and is provided with 2 lifting holes (threaded holes), 2 bolt mounting through holes and 9 valve cap fixing bolt holes, and is also provided with a hydraulic oil hole 101 inside, the top opening of the hydraulic oil hole 101 is a hydraulic oil inlet a, the upper portion of the valve cap 1 is also provided with a control oil inlet b and a sealing oil inlet c, and the side edge is provided with two discharge holes and a process hole, the discharge holes are used for discharging hydraulic oil during disassembly, and the process hole is sealed by the plug screw 7 (see fig. 1).
The valve housing 2 is a basic component of the gas injection valve, and please refer to fig. 2, 5 and 6, the upper end surface of the valve housing 2 is provided with 9 threaded holes, and the valve cover 1 and the valve housing 2 are fastened together by nine valve cover fastening bolts 8; the lower terminal surface of valve casing 2 is equipped with 10 screw holes, and the outside is equipped with hydraulic oil discharge port d, gas entry e, gas leak hunting mouth f and gas return port g.
Referring to fig. 2, 20 and 21, the valve housing 2 is a hollow cylindrical member, the upper portion of the inner cavity is provided with a hydraulic oil chamber a, the lower portion of the inner cavity is provided with a gas chamber C, the hydraulic oil chamber a is communicated with the hydraulic oil release port d, and the gas chamber C is communicated with the gas return port g. An upper gas hole 102, a valve casing gas hole 104, a detection gas hole 107 and a lower gas hole 108 are arranged in the valve casing 2 in an intricate manner; should go up gas hole 102 intercommunication gas inlet e, valve casing gas hole 104 upper end intercommunication gas chamber C, the lower extreme opening in the lower terminal surface of valve casing 2, it connects to detect gas hole 107 one end gas leak detection mouth f, the other end opening in the lower terminal surface of valve casing 2, gas hole 108 one end is connected down gas inlet e, the other end opening in the lower terminal surface of valve casing 2.
Referring to fig. 2, 22 and 23, an upper sealing oil hole 111, a lower sealing oil hole 113 and a sealing oil ring groove 112 are further formed in the valve housing 2; this lower sealed oilhole 113 and sealed oil ring groove 112 respectively with go up sealed oilhole 111 intercommunication, the upper end opening of going up sealed oilhole 111 in the up end of valve casing 2, and then the intercommunication the sealed oil entry c of valve gap 1, the lower extreme opening of lower sealed oilhole 113 in the lower terminal surface of valve casing 2, sealed oil ring groove 112 set up in just encircle on the inner chamber wall of valve casing 2 the periphery of hydraulic piston 12. The valve housing 2 is further provided therein with a control oil hole 114, one end of the control oil hole 114 is opened to an upper end surface of the valve housing 2 and is communicated with the control oil inlet b of the valve cap 1, and the other end thereof is opened to a lower end surface of the valve housing 2.
Referring to fig. 1, 6 annular grooves are distributed on the periphery of the valve housing 2, the valve housing wear-resistant ring 17 is structurally shown in fig. 18, and is arranged in one of the annular grooves to play a role in bearing and grinding and sealing, and the rest of the annular grooves are provided with sealing rings 19 to form a sealing structure.
Referring to fig. 1, 2 and 7, the intermediate body 3 is mounted below the valve housing 2 through a positioning pin 10 and a fixing bolt 9, and is a hollow cylinder. Referring to fig. 22 and 23, a sealing oil chamber F is formed inside the intermediate body 3 and communicates with the lower sealing oil hole 113 of the valve housing 2; the outer part of the intermediate body 3 is provided with 1 ring groove, and an intermediate body wear-resisting ring 18 is installed in the ring groove, please refer to fig. 19, which plays a role in bearing the wear during the installation and disassembly process of the gas jet valve so as to prevent the intermediate body 3 from being worn.
The intermediate body 3 is provided with an intermediate body first gas hole 105, an intermediate body second gas hole 109 and an intermediate body control oil hole 115 inside. Referring to fig. 20 and 21, one end of the intermediate body first fuel gas hole 105 and one end of the intermediate body second fuel gas hole 109 are opened on the upper end face of the intermediate body 3, and the other end thereof is opened on the lower end face of the intermediate body 3; the upper end of the intermediate body first gas hole 105 communicates with the valve housing gas hole 104 of the valve housing 2, and the upper end of the intermediate body second gas hole 109 communicates with the lower gas hole 108 of the valve housing 2. Referring to fig. 22 and 23, one end of the intermediate body control oil hole 115 opens at the upper end surface of the intermediate body 3 and communicates with the control oil hole 114 of the valve housing 2, and the other end opens at the lower end surface of the intermediate body 3. The intermediate body 3 is circumferentially provided with 10 bolt through holes.
Referring to fig. 8 and fig. 2, the needle valve body 4 is a hollow structure in the shape of a boss, 10 bolt holes are circumferentially arranged at the boss, the needle valve body 4 is positioned below the intermediate body 3 by a positioning pin 10, and is fastened with the intermediate body 3 and the valve housing 2 in sequence by 10 fixing bolts 9. Referring to fig. 21 and 22, the needle valve body 4 has a control oil chamber G at its upper part, a leakage gas chamber E at its middle part, and a needle valve body gas chamber D at its lower part, which is communicated with the nozzle 5. The outside of needle valve body 4 is equipped with a seal groove, installs sealing washer 19.
Referring to fig. 20, 21 and 23, the needle valve body 4 has a needle valve body first gas hole 106, a needle valve body second gas hole 110 and a needle valve body control oil hole 116 arranged in a staggered manner inside; the upper end of the needle valve body first gas hole 106 is opened on the upper end surface of the needle valve body 4 and is communicated with the intermediate body first gas hole 105 of the intermediate body 3, and the lower end is communicated with the needle valve body gas cavity D; the upper end of the needle valve body second fuel gas hole 110 is opened on the upper end surface of the needle valve body 4 and is communicated with the intermediate body second fuel gas hole 109 of the intermediate body 3, and the lower end is communicated with the leakage fuel gas cavity E; the upper end of the needle valve body control oil hole 116 opens at the upper end face of the needle valve body 4 and communicates with the intermediate body control oil hole 115 of the intermediate body 3, and the lower end communicates with the control oil chamber G.
Referring to fig. 9, 10 and 2, the nozzle 5 is screwed to the lower part of the needle valve body 4 through the connecting nut 6, and the lower end of the nozzle 5 is generally provided with 3 to 5 fine gas injection holes j, through which the gas is injected into the combustion chamber.
Referring to fig. 11 and 12, the hydraulic piston 12 is cylindrical, the top of the hydraulic piston is provided with a lifting thread, the periphery of the upper piston head is provided with a circular groove, the lower part of the hydraulic piston is provided with a piston gas cavity B and a piston gas hole 103 which are transversely penetrated, the upper end of the piston gas hole 103 is communicated with the piston gas cavity B, and the lower end of the piston gas hole is opened at the bottom end of the hydraulic piston 12.
The piston ring 20 is installed in a ring groove at the head of the hydraulic piston 12, and mainly plays a role in sealing and bearing abrasion.
Referring to fig. 2 and 20, the hydraulic piston 12 is mounted in the inner cavity of the valve housing 2 and can move up and down, the head of the hydraulic piston is disposed in the hydraulic oil chamber a at the upper part of the valve housing 2, and the outer side of the piston ring 20 is in sealing contact with the inner wall of the hydraulic oil chamber a; the piston gas hole 103 communicates the piston gas chamber B with a gas chamber C at the lower portion of the valve housing 2.
Referring to fig. 2 and 20, the check valve assembly 13 is installed in a piston gas hole 103 at the lower part of the hydraulic piston 12, and mainly functions to control the one-way passage of gas. Referring to fig. 13, the check valve assembly 13 is composed of a small spring, a valve stem and a valve seat.
Referring to fig. 14 and 2, the thrust block assembly 11 is connected to the lower portion of the valve housing 2 by a screw thread at its upper end, and penetrates the intermediate body 3 at its lower end, and mainly functions to support and fix the plunger assembly 14 and the spring assembly 15.
Referring to fig. 15 and 2, the plunger assembly 14 is composed of a spring and a plunger, and is installed in the lower portion of the valve housing 2 and above the thrust block assembly 11. When the plunger assembly 14 is in a free state, the plunger thereof blocks the gas passage under the support of the spring, so that the magnitude of the elastic force of the spring determines the magnitude of the pressure of the gas after being compressed.
Referring to fig. 2 and 16, the spring assembly 15 is installed in a sealed oil chamber F in the middle body 3 and located below the thrust block assembly 11, and the spring assembly 15 mainly comprises a large spring and a spring seat and applies a downward pushing force to the needle valve 16.
Referring to fig. 2 and 17, the needle valve 16 is installed inside the needle valve body 4, and is located below the spring assembly 15, the upper end of the needle valve abuts against the large spring, the conical surface of the lower portion of the needle valve body and the inner conical surface of the needle valve body 4 form a sealing surface, and the control oil chamber G, the leakage gas chamber E and the needle valve body gas chamber D are located between the needle valve body 4 and the needle valve 16; the upper part of the needle valve 16 is pressed downwards by the spring assembly 15, so that the conical surface of the lower part of the needle valve is tightly attached to the inner conical surface of the needle valve body 4. The needle valve 16 can move up and down in the needle valve body 4, and the distance between the needle valve 16 and the thrust block assembly 11 determines the stroke distance of the needle valve 16.
The main channels in the internal structure of the invention are a gas channel, a hydraulic oil channel, a control oil channel and a sealing oil channel.
Referring to fig. 20 and 21, the gas channel path is: the gas enters the gas jet valve from the gas inlet e and then is divided into two paths: one path of gas passes through the upper gas hole 102 to the piston gas cavity B of the hydraulic piston 12, then the check valve assembly 13 is pushed to be opened downwards through the piston gas hole 103, the gas enters the gas cavity C, when the hydraulic piston 12 is pushed to move downwards by hydraulic oil, along with the increase of the pressure in the gas cavity C, the check valve assembly 13 is closed upwards, meanwhile, the plunger assembly 14 is opened downwards, the gas passes through the valve casing gas hole 104 → the intermediate body first gas hole 105 → the needle valve body first gas hole 106 → the needle valve body gas cavity D from the gas cavity C, and after the needle valve 16 is opened, the gas is sprayed out through the nozzle 5 from the needle valve body gas cavity D; the other path passes through the lower gas hole 108 → the intermediate body second gas hole 109 → the needle valve body second gas hole 110 → the leakage gas chamber E, and the main function of this gas path is to receive the high-pressure gas leaked from the gap between the needle valve 16 and the needle valve body 4, so as to prevent the high-pressure gas from leaking into the control oil system. When there is gas leakage between the valve housing 2 and the connection face of the intermediate body 3, gas can pass through the detection gas hole 107 to the gas leakage detection port f. In addition, when the gas injection valve is stopped, the gas in the valve can be blown out through the gas return port g by the ventilation system.
The hydraulic oil channel path is as follows: after hydraulic oil enters the gas jet valve through a hydraulic oil inlet a, the hydraulic piston 12 is pressed down through the hydraulic oil hole 101; if there is any leakage of the hydraulic oil from the piston ring 20, the hydraulic oil flows out from the hydraulic oil release port d through the hydraulic oil chamber a.
Referring to fig. 22 and 23, the path of the seal oil passage is: the sealing oil enters the gas jet valve from the sealing oil inlet c and then is divided into two paths: one path passes through the upper sealing oil hole 111 → the sealing oil ring groove 112 to the contact surface of the valve housing 2 and the hydraulic piston 12, and plays roles of lubrication and sealing; the other path passes through the upper seal oil hole 111 → the lower seal oil hole 113 → the seal oil chamber F, and mainly plays a role of lubricating the needle valve 16.
The control oil passage path is: after the control oil enters the gas jet valve from the control oil inlet b, the control oil passes through the control oil hole 114 → the intermediate body control oil hole 115 → the needle valve body control oil hole 116 → the control oil chamber G, the pressure thereof is much greater than the pressure of the spring assembly 15 acting on the needle valve 16, so that the needle valve 16 moves upward, and then the needle valve body gas chamber D below communicates with the nozzle 5, and the gas is injected. The main function of the control oil is to open the needle valve 16 at a certain time under the action of the control system to control the injection of the fuel gas.
Referring to fig. 20, fig. 23 and fig. 21, the working principle of the present invention is as follows:
when the hydraulic piston 12 is positioned at the top dead center, gas enters the piston gas cavity B of the hydraulic piston 12 from the gas inlet e through the upper gas hole 102, then the check valve assembly 13 is pushed to be opened downwards through the piston gas hole 103, and the gas enters and fills the gas cavity C; when hydraulic oil is introduced into the hydraulic oil hole 101 through the hydraulic oil inlet a, the hydraulic piston 12 is pushed to move downwards to compress gas, so that the gas pressure in the gas cavity C is increased; when the pressure reaches a certain value, the plunger assembly 14 is pushed to open downwards, and gas enters the needle valve body gas cavity D through the valve casing gas hole 104, the intermediate body first gas hole 105 and the needle valve body first gas hole 106 in sequence; under the action of the control system, control oil passes through the control oil hole 114, the intermediate body control oil hole 115 and the needle valve body control oil hole 116 from the control oil inlet b in sequence and enters the control oil chamber G, the control oil with the pressure higher than that of gas pushes the needle valve 16 to be opened upwards, and the gas in the needle valve body gas chamber D enters the nozzle 5 and is sprayed outwards from the gas spraying hole j.
The invention has the characteristics of safe use, convenient operation, easy control, good injection effect and the like, and can be widely applied to large-scale marine liquefied petroleum gas dual-fuel diesel engines.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the contents of the present application should be considered to be within the technical scope of the present invention.
Claims (6)
1. The utility model provides a gas jet valve of marine low-speed machine, installs on the dual-fuel diesel engine that uses liquefied petroleum gas which characterized in that: the gas jet valve comprises a valve cover, a valve shell, a middle body, a needle valve body, a connecting nut, a nozzle, a hydraulic piston, a thrust block component, a check valve component, a plunger component, a spring component and a needle valve;
the valve shell is a hollow cylindrical component, a hydraulic oil cavity is arranged at the upper part of the inner cavity, a gas cavity is arranged at the lower part of the inner cavity, a gas inlet is arranged outside the valve shell, an upper gas hole, a valve shell gas hole and a control oil hole are arranged inside the valve shell, the upper gas hole is communicated with the gas inlet, and the upper end of the valve shell gas hole is communicated with the gas cavity;
the valve cover is fixed on the upper part of the valve shell, a hydraulic oil hole is arranged in the valve cover, an opening at the top end of the hydraulic oil hole is a hydraulic oil inlet, the lower end of the hydraulic oil hole is communicated with a hydraulic oil cavity of the valve shell, and a control oil inlet communicated with a control oil hole of the valve shell is also arranged on the valve cover;
the middle body is a cylinder with a hollow inner part and is fixedly arranged below the valve shell, a middle body first gas hole and a middle body control oil hole are formed in the middle body, the upper end of the middle body first gas hole is communicated with the valve shell gas hole of the valve shell, and the upper end of the middle body control oil hole is communicated with the control oil hole of the valve shell;
the needle valve body is of a boss-shaped hollow structure and is fixedly connected below the intermediate body, a control oil cavity, a needle valve body gas cavity, a needle valve body first gas hole and a needle valve body control oil hole are formed in the needle valve body, the upper end of the needle valve body first gas hole is communicated with the intermediate body first gas hole of the intermediate body, the lower end of the needle valve body first gas hole is communicated with the needle valve body gas cavity, the upper end of the needle valve body control oil hole is communicated with the intermediate body control oil hole of the intermediate body, and the lower end of the needle valve body control oil hole is communicated with the control oil;
the nozzle is screwed and fixed at the lower part of the needle valve body through the connecting nut and is communicated with the needle valve body gas cavity, and the lower end of the nozzle is provided with a gas orifice;
the hydraulic piston is cylindrical and is arranged in the inner cavity of the valve shell and can move up and down, the head of the hydraulic piston is arranged in the hydraulic oil cavity, a piston ring is arranged in a ring groove of the head and is in sealing contact with the inner wall of the hydraulic oil cavity, the lower part of the hydraulic piston is provided with a piston gas cavity and a piston gas hole which are transversely communicated, the upper end of the piston gas hole is communicated with the piston gas cavity, and the lower end of the piston gas hole is communicated with the gas cavity of the valve shell;
the check valve assembly is arranged in a piston gas hole at the lower part of the hydraulic piston to control the unidirectional passing of gas; the upper end of the thrust block component is connected to the lower part of the valve casing through threads, the lower end of the thrust block component penetrates into the intermediate body, and the plunger component is installed at the lower part in the valve casing and is positioned above the thrust block component; the spring assembly is arranged in the middle body and is positioned below the thrust block assembly;
the needle valve is arranged in the needle valve body and can move up and down, the needle valve is positioned below the spring assembly and is pressed downwards by the spring assembly, and a sealing surface is formed by a conical surface at the lower part of the needle valve and an inner conical surface of the needle valve body;
gas enters the piston gas cavity of the hydraulic piston from the gas inlet through the upper gas hole and then pushes the check valve assembly to be opened downwards through the piston gas hole, and the gas enters and fills the gas cavity; hydraulic oil is introduced into the hydraulic oil hole through the hydraulic oil inlet, the hydraulic piston is pushed to move downwards, gas in the gas cavity is compressed to increase the pressure to a certain value, the plunger assembly is pushed to open downwards, and the gas enters the needle valve body gas cavity through the valve shell gas hole, the intermediate body first gas hole and the needle valve body first gas hole in sequence; the control oil enters the control oil cavity from the control oil inlet sequentially through the control oil hole, the intermediate control oil hole and the needle valve body control oil hole, the needle valve is pushed to be opened upwards by the control oil with the pressure larger than that of gas, and the gas in the needle valve body gas cavity enters the nozzle and is sprayed outwards from the gas spraying hole.
2. The gas injection valve of a marine low-speed machine according to claim 1, characterized in that: the upper part of the valve cover is also provided with a sealing oil inlet, the inside of the valve shell is also provided with an upper sealing oil hole, a lower sealing oil hole and a sealing oil ring groove, and the inside of the intermediate body is provided with a sealing oil cavity; the upper end of the upper sealing oil hole is communicated with the sealing oil inlet, the lower sealing oil hole and the sealing oil ring groove are respectively communicated with the upper sealing oil hole, the sealing oil ring groove is arranged on the wall of the inner cavity of the valve shell and surrounds the periphery of the hydraulic piston, and the sealing oil cavity is communicated with the lower sealing oil hole;
the sealing oil enters the gas jet valve from the sealing oil inlet and then is divided into two paths: one path of the oil reaches the contact surface of the valve shell and the hydraulic piston through the upper sealing oil hole and the sealing oil ring groove, and plays roles in lubrication and sealing; and the other path of the oil reaches the sealed oil cavity through the upper sealed oil hole and the lower sealed oil hole, and plays a lubricating role in the needle valve.
3. The gas injection valve of a low-speed marine engine according to claim 1 or 2, characterized in that: the outer part of the valve shell is provided with a gas leakage detecting port and a gas return port, the inner part of the valve shell is also provided with a gas detecting hole and a lower gas hole, the inner part of the intermediate body is also provided with an intermediate body second gas hole, and the inner part of the needle valve body is also provided with a leakage gas cavity and a needle valve body second gas hole;
the upper end of the lower gas hole is connected with the gas inlet, and the lower end of the lower gas hole is communicated with the intermediate body second gas hole, the needle valve body second gas hole and the leaked gas cavity in sequence so as to recycle the gas leaked from the gap between the needle valve and the needle valve body; one end of the gas detection hole is connected with the gas leakage detection port, and the other end of the gas detection hole is opened at the lower end face of the valve shell and used for discharging leaked gas between the valve shell and the connecting face of the intermediate body; the gas return port is communicated with the gas cavity and is used for blowing out gas in the valve when the gas jet valve stops using.
4. The gas injection valve of a low-speed marine engine according to claim 1 or 2, characterized in that: and a hydraulic oil release port is also arranged outside the shell and communicated with the hydraulic oil cavity for discharging hydraulic oil leaked from the piston ring.
5. The gas injection valve of a low-speed marine engine according to claim 1 or 2, characterized in that: a plurality of annular grooves are distributed on the periphery of the valve shell, valve shell wear-resisting rings and sealing rings are arranged in the annular grooves, annular grooves are arranged outside the intermediate body, intermediate body wear-resisting rings are arranged in the annular grooves, sealing grooves are arranged outside the needle valve body, and sealing rings are arranged in the annular grooves; the seal ring forms a seal structure, and the valve casing wear-resisting ring and the intermediate wear-resisting ring play a role in bearing wear.
6. The gas injection valve of a marine low-speed machine according to claim 1, characterized in that: the stroke distance of the needle valve is determined by the distance between the needle valve and the thrust block assembly.
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| CN202010593785.3A CN111828203B (en) | 2020-06-28 | 2020-06-28 | Gas jet valve of low-speed machine for ship |
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| CN112343739A (en) * | 2020-11-26 | 2021-02-09 | 中船动力研究院有限公司 | Gas injection valve |
| CN113756994A (en) * | 2021-08-12 | 2021-12-07 | 上海中船三井造船柴油机有限公司 | Gas engine inlet regulating valve device of marine dual-fuel low-speed diesel engine |
| CN113944574A (en) * | 2021-11-02 | 2022-01-18 | 上海中船三井造船柴油机有限公司 | Gas jet valve of marine diesel engine |
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