CN213392462U - Dual-fuel injector and engine - Google Patents
Dual-fuel injector and engine Download PDFInfo
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- CN213392462U CN213392462U CN202022372306.3U CN202022372306U CN213392462U CN 213392462 U CN213392462 U CN 213392462U CN 202022372306 U CN202022372306 U CN 202022372306U CN 213392462 U CN213392462 U CN 213392462U
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Abstract
The utility model discloses a dual fuel sprayer and engine belongs to internal-combustion engine technical field. In the dual-fuel injector, the injector body comprises an injector upper body assembly, an injector lower body assembly and a needle valve sleeve, and the needle valve sleeve is provided with an air jet; the gas control needle valve penetrates through the needle valve sleeve, a high-pressure gas cavity is formed between the gas control needle valve and the needle valve sleeve, and the head of the gas control needle valve is provided with an oil injection port; the oil control needle valve penetrates through the air control needle valve, the tail part of the oil control needle valve extends into the lower body component of the ejector, and a fuel oil cavity is formed between the oil control needle valve and the lower body component of the ejector; the built-in oil control valve component and the external air control valve component can respectively change the pressure of control fluid in the oil control cavity and the air control cavity so as to cause the oil control needle valve and the air control needle valve to move. The engine includes the dual fuel injector described above. The utility model discloses can realize the injection mode of dual fuel (the liquid fuel that sprays earlier ignites the high-pressure gas fuel that the back sprays).
Description
Technical Field
The utility model relates to an internal-combustion engine field especially relates to a dual fuel injector and engine.
Background
Most of the existing injectors are gas fuel injectors and liquid fuel injectors. The gas fuel injector and the liquid fuel injector can only inject single kind of fuel, and cannot inject the gas fuel and the liquid fuel simultaneously or alternatively.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a dual fuel injector and engine can spray gaseous fuel and liquid fuel.
In order to realize the purpose, the following technical scheme is provided:
in a first aspect, a dual fuel injector is provided, comprising:
the ejector comprises an ejector body, a needle valve sleeve and a control device, wherein the ejector body comprises an ejector upper body assembly, an ejector lower body assembly and the needle valve sleeve which are sequentially arranged from top to bottom, and the needle valve sleeve is provided with an air jet;
the gas control needle valve penetrates through the needle valve sleeve, a high-pressure gas cavity is formed between the gas control needle valve and the needle valve sleeve, and the head of the gas control needle valve extends out of the needle valve sleeve and is provided with an oil injection port;
the oil control needle valve penetrates through the gas control needle valve, the tail part of the oil control needle valve extends into the lower body component of the ejector, and a fuel oil cavity is formed between the oil control needle valve and the gas control needle valve;
the gas control cavity is associated with the gas control needle valve;
an oil control chamber associated with the oil control needle valve;
the built-in oil control valve component is arranged in the injector lower body component in a seating and embedding way and can change the pressure of control fluid in the oil control cavity so as to cause the oil control needle valve to move to connect or disconnect the fuel oil cavity and the oil injection port;
and the external gas control valve assembly is arranged at the upper end of the injector upper body assembly and can change the pressure of control fluid in the gas control cavity so as to cause the gas control needle valve to move to connect or cut off the high-pressure gas cavity and the gas jet.
As the utility model discloses a preferred scheme of dual fuel injector, injector lower part of the body subassembly includes the injector lower part of the body and accuse oily control panel subassembly, accuse oily control panel subassembly sit inlay in it is internal under the injector, seted up on the accuse oily control panel subassembly accuse oily control chamber, the afterbody of accuse oily needle valve stretches into the injector lower part of the body and exposes in accuse oily control chamber.
As a preferred scheme of the utility model discloses a dual fuel injector, built-in accuse oil valve subassembly set up in internal under the sprayer, and lie in accuse oil control board subassembly is kept away from one side of accuse oil needle valve, control oily control board subassembly on seted up with first oil feed orifice and the first orifice of producing oil of accuse oil control chamber intercommunication, accuse oil control board subassembly with form first pressure release chamber between the lower part of the body of the sprayer, built-in accuse oil valve subassembly can cut off or open the oil-out of first orifice of producing oil, the accuse gas fluid in the accuse gas control intracavity can warp first orifice of producing oil flows in first pressure release chamber.
As a preferable aspect of the dual fuel injector of the present invention, the flow rate of the control fluid at the first oil inlet throttle is smaller than the flow rate of the control fluid at the first oil outlet throttle.
As the utility model discloses a dual fuel injector's an preferred scheme still includes accuse gas control panel subassembly, accuse gas control panel subassembly includes accuse gas oil inlet plate, accuse gas oil inlet plate set up in the injector lower part of the body subassembly with between the needle valve cover, the accuse oil needle valve passes accuse gas oil inlet plate, the cover is equipped with the support cover on the accuse oil needle valve, support the cover accuse gas oil inlet plate with form between the accuse gas needle valve accuse gas control chamber.
As a preferred scheme of the utility model discloses a dual fuel injector, control gas advance oil board on seted up with the second oil feed orifice of control gas control chamber intercommunication, control gas control panel subassembly still includes the control gas oil board that produces, the control gas oil board seat in the injector upper part of the body subassembly, control gas produce and seted up on the oil board with the second oil orifice that the control gas control chamber communicates, external accuse pneumatic valve subassembly set up in the upside of control gas oil board, external accuse pneumatic valve subassembly can cut off or open the oil-out of second oil orifice, external accuse pneumatic valve subassembly with form the second pressure release chamber between the injector upper part of the body subassembly, the control fluid in the control gas control chamber can pass through the second oil orifice flows in the second pressure release chamber.
As a preferable aspect of the dual fuel injector of the present invention, the flow rate of the control fluid at the second oil inlet throttle is smaller than the flow rate of the control fluid at the second oil outlet throttle.
As the utility model discloses a dual fuel injector's a preferred scheme still includes intercommunication runner and oil extraction runner, the intercommunication runner intercommunication first oil outlet orifice with second oil outlet orifice, oil extraction runner's a port with first oil outlet orifice or second oil outlet orifice intercommunication, another port end in the outer wall of sprayer body.
As a preferred scheme of the utility model discloses a dual fuel injector still includes the oil feed runner, the oil feed runner is configured to with the fuel oil chamber the accuse gas control chamber with the accuse oil control chamber communicates with the oil source respectively.
In a second aspect, an engine is provided that includes a dual fuel injector as described above.
The utility model has the advantages that:
in the dual-fuel injector and the engine comprising the dual-fuel injector, when the built-in oil control valve component is electrified, the pressure in the oil control cavity is reduced, the oil control valve is moved upwards, the fuel cavity is communicated with the fuel injection port, and fuel is injected to the combustion chamber of the engine; when the external gas control valve component is electrified, the pressure in the gas control cavity is reduced, the gas control valve is moved upwards, the high-pressure gas cavity is communicated with the gas jet, and the high-pressure gas is jetted to a combustion chamber of the engine. The built-in oil control valve component and the external gas control valve component are of two independent structures, so that the two valve components can be conveniently and respectively controlled to be powered on and powered off, and the injection of fuel oil and high-pressure fuel gas can be respectively controlled. The on-off interval and the time length of the built-in oil control valve component and the built-out gas control valve component are controlled, and a dual-fuel (high-pressure gas fuel injected after the liquid fuel injected first is ignited) injection mode is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a cross-sectional view of a dual fuel injector provided in an embodiment of the present invention in a first cross-section;
FIG. 2 is a schematic diagram of a portion of the structure of FIG. 1;
FIG. 3 is a cross-sectional view of a dual fuel injector provided in accordance with an embodiment of the present invention at a second cross-section;
FIG. 4 is a cross-sectional view of a dual fuel injector provided in an embodiment of the present invention at a third cross-section;
fig. 5 is a cross-sectional view of a dual fuel injector provided in an embodiment of the present invention at a fourth cross-section.
Reference numerals:
10-high pressure gas chamber; 20-a fuel cavity; 30-an oil inlet flow passage; 40-an air inlet flow channel; 50-a communicating flow channel; 60-a transition flow channel; 70-a first pressure relief cavity; 80-a second pressure relief cavity; 90-gas joints; 100-oil discharge flow channel;
1 a-a first integral locking cap; 1 b-a second body locking cap; 1 c-third body tightening cap;
2 a-air injection pressure regulating spring; 2 b-oil injection pressure regulating spring;
3 a-a first oil intake section; 3 b-a second oil intake section; 3 c-a third oil inlet section; 3 d-a fourth oil intake section; 3 e-the first branch; 3 f-second branch;
4 a-a first air intake section; 4 b-a second gas inlet section; 4 c-a third gas inlet section; 4 d-a fourth gas inlet section; 4 e-a fifth intake section;
5 a-a first spacer; 5 b-a second spacer;
6 a-a first flow channel; 6 b-a second flow channel; 6 c-a third flow channel;
1-an injector body; 2-controlling the gas needle valve; 3-oil control needle valve; 4-controlling the gas control cavity; 5-oil control cavity; 6-built-in oil control valve component; 7-external air control valve component; 8-oil control panel assembly; 9-a gas control panel assembly;
11-injector upper body assembly; 12-injector lower body assembly; 13-needle valve housing; 131-an air jet;
111-a wire-passing hole;
121-injector lower body; 122-a support sleeve; 123-a sliding sleeve;
21-an oil nozzle;
61-a first steel ball; 62-a first spring; 63-a first electromagnet; 64-a first armature; 65-a first armature rod;
71-a second steel ball; 72-a second spring; 73-a second electromagnet; 74-a second armature; 75-a second armature rod;
81-oil control and oil inlet plate; 82-oil control and oil outlet plate;
811-first oil intake orifice; 812-a first oil outlet orifice; 821-oil discharge hole;
91-controlling air and oil inlet plate; 92-gas control oil outlet plate;
911-second oil intake orifice; 921 — second outlet orifice.
Detailed Description
In order to make the technical problems, technical solutions adopted and technical effects achieved by the present invention clearer, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-5, the present embodiment provides a dual fuel injector, which includes an injector body 1, a gas control needle valve 2, an oil control needle valve 3, a gas control chamber 4, an oil control chamber 5, a built-in oil control valve assembly 6, and an external air control valve assembly 7.
The injector body 1 includes an injector upper body assembly 11, an injector lower body assembly 12, and a needle valve sleeve 13, which are sequentially arranged from top to bottom. The upper injector body assembly 11 and the lower injector body assembly 12 are connected by a first tightening cap 1 a. The injector lower body assembly 12 and the needle valve housing 13 are connected by a second body locking cap 1 b.
A first bore is formed in the needle valve housing 13. The air control needle valve 2 is embedded in the first boring hole. The gas control needle valve 2 comprises a first section and a second section which are connected up and down. The first section is matched with a needle valve sleeve 13 matching part. A high-pressure gas cavity 10 is formed between the second section and the inner wall of the corresponding first boring hole. The needle valve housing 13 is provided with an air vent 131. The gas control needle valve 2 can move up and down in the first bore to conduct or cut off the high-pressure gas chamber 10 and the gas injection port 131. The head end of the gas control needle valve 2 extends out of the needle valve sleeve 13 and is provided with an oil injection port 21.
And a second boring hole is formed in the gas control needle valve 2. The oil control needle valve 3 is seated in the second bore, and the tail of the oil control needle valve extends into the injector lower body assembly 12. The oil control needle valve 3 comprises a third section, a fourth section, a fifth section and a sixth section which are connected from bottom to top. The third section and the fourth section correspond to the gas control needle valve 2. The fifth and sixth sections correspond to injector lower body assembly 12. The third section forms a fuel chamber 20 with the inner wall of the corresponding second bore. The oil control needle valve 3 moves up and down to open or close the fuel cavity 20 and the fuel injection port 21. The fourth section is matched with the air control needle valve 2 matching part.
The injector lower body assembly 12 includes an injector lower body 121, an oil control plate assembly 8, a support sleeve 122, and a sliding sleeve 123. The injector lower body 121 is connected to the needle hub 13 through the second locking cap 1 b. A third bore is formed in the injector lower body 121, and the oil control panel assembly 8, the sliding sleeve 123 and the support sleeve 122 are sequentially disposed in the third bore from top to bottom.
The tail parts (namely the fifth section and the sixth section) of the oil control needle valve 3 extend into the third bore hole. The support sleeve 122 is sleeved on the fifth section of the oil control needle valve 3. The bottom of the support sleeve 122 is provided with a shaft shoulder, on which an air injection pressure regulating spring 2a is sleeved. Two ends of the air injection pressure regulating spring 2a are respectively abutted with the support sleeve 122 and the air control needle valve 2.
The sliding sleeve 123 is sleeved on the sixth section of the oil control needle valve 3. The oil control needle valve 3 is simultaneously connected with the matching parts of the supporting sleeve 122 and the sliding sleeve 123. One end of the fifth section of the oil control needle valve 3, which is close to the sixth section, is in a step shape, and an oil injection pressure regulating spring 2b is sleeved on the fifth section of the oil control needle valve.
The oil control plate component 8 is arranged at the tail end of the oil control needle valve 3. The built-in oil control valve component 6 is embedded in the third boring hole and is positioned on one side, away from the oil control needle valve 3, of the oil control plate component 8.
The oil control panel assembly 8 includes an oil control inlet plate 81 and an oil control outlet plate 82. The oil control inlet plate 81 is provided with the oil control cavity 5. The tail end of the control needle valve is exposed to the oil control chamber 5. Under the combined action of the oil injection pressure regulating spring 2b and the control fluid in the oil control cavity 5, the oil control needle valve 3 is stably seated in the second boring hole of the air control needle valve 2 so as to cut off the fuel oil cavity 20 and the oil injection port 21.
The oil control inlet plate 81 is further provided with a first oil inlet orifice 811 and a first oil outlet orifice 812 which are communicated with the oil control chamber 5. Control fluid flows into the oil control chamber 5 through the first oil inlet orifice 811 and flows out of the oil control chamber 5 through the first oil outlet orifice 812. The end of the first oil outlet orifice 812 remote from the oil control chamber 5 is a tapered oil outlet. The first steel ball 61 of the built-in oil control valve assembly 6 can be seated in the tapered oil outlet to cut off or open the tapered oil outlet of the first oil outlet orifice 812. The oil control and outlet plate 82 is provided with an oil discharge hole 821. A first pressure relief cavity 70 is formed between the oil control outlet plate 82 and the inner wall of the third bore. The control fluid in the oil control chamber 5 can flow from the tapered oil outlet of the first oil outlet orifice 812 into the oil drain hole 821, and then flow from the oil drain hole 821 into the first pressure relief chamber 70.
Besides the first steel ball 61, the built-in oil control valve assembly 6 further includes a first spring 62, a first electromagnet 63, a first armature 64 and a first armature rod 65. The first armature rod 65 penetrates the oil control and outlet plate 82. The first steel ball 61 is connected to the end of the first armature rod 65. Under the elastic force of the first spring 62, the first armature rod 65 moves downward, and the first steel ball 61 is seated in the oil outlet of the first oil outlet orifice 812. When the first electromagnet 63 is powered on, the first electromagnet 63 magnetically attracts the first armature 64 to move upwards, the first armature 64 drives the first armature rod 65 and the first steel ball 61 to move upwards, the first steel ball 61 is separated from the conical surface of the oil outlet of the first oil outlet throttle hole 812, and high-pressure fluid in the oil control chamber 5 flows into the first pressure relief chamber 70 through the first oil outlet throttle hole 812 and the oil drain hole 821. The pressure in the oil control chamber 5 drops, the oil control valve moves upwards, the fuel oil chamber 20 is communicated with the fuel injection port 21, and the fuel oil is injected into the combustion chamber of the engine.
Preferably, the flow rate of the first oil inlet throttle hole 811 is smaller than the flow rate of the first oil outlet throttle hole 812, so that quick pressure relief and quick fuel injection are realized.
The dual fuel injector also includes a gas control panel assembly 9. The air control panel assembly 9 includes an air control oil inlet plate 91 and an air control oil outlet plate 92. The air control oil inlet plate 91 is sandwiched between the injector lower body 121 and the needle valve sleeve 13. The gas control oil outlet plate 92 is arranged on the upper part of the ejector upper body assembly 11 and corresponds to the external gas control valve assembly 7.
A gas control cavity 4 is formed among the gas control oil outlet plate 92, the support sleeve 122, the injector lower body 121 and the oil control needle valve 3, namely, the tail part of the gas control needle valve 2 is exposed to the gas control cavity 4. The gas control needle valve 2 is stably seated in the first bore of the needle valve housing 13 under the action of the control fluid in the gas control chamber 4 and the above-mentioned gas injection pressure regulating spring 2a, so as to cut off the high-pressure gas chamber 10 and the gas injection port 131.
And a second oil inlet throttling hole 911 communicated with the air control cavity 4 is further formed in the air control oil inlet plate 91. The control gas fluid enters the control gas chamber 4 through the second oil inlet orifice 911. And a second oil outlet throttle hole 921 is arranged on the air control oil outlet plate 92. The second oil outlet orifice 921 communicates through the transition flow path 60. The transition flow path 60 includes a first flow path 6a, a second flow path 6b, and a third flow path 6c connected in this order. The first flow channel 6a is opened through the air-control oil inlet plate 91. The second flow passage 6b opens through the injector lower body 121. The third flow passage 6c opens to the injector lower body 121. One end of the third flow passage 6c, which is far away from the second flow passage 6b, is communicated with the second oil outlet orifice 921 on the gas control oil outlet plate 92. The end of the second oil outlet orifice 921 remote from the third flow passage 6c is a tapered oil outlet. The second steel ball 71 of the external air control valve assembly 7 can be seated on the conical surface of the oil outlet of the second oil outlet flow passage to cut off or open the oil outlet of the second oil outlet throttle hole 921. A second pressure relief chamber 80 is formed between the air control oil outlet plate 92 and the injector upper body assembly 11, and the control fluid in the air control chamber 4 flows into the second pressure relief chamber 80 through the second oil outlet orifice 921.
Besides the second steel ball 71, the external air control valve assembly 7 further includes a second spring 72, a second electromagnet 73, a second armature 74 and a second armature rod 75. A second steel ball 71 is connected to the end of a second armature rod 75. Under the elastic force of the second spring 72, the second armature rod 75 moves downward, and the second steel ball 71 is seated on the tapered surface of the oil outlet of the second oil outlet orifice 921. When the second electromagnet 73 is powered on, the second electromagnet 73 magnetically attracts the second armature 74 to move upwards, the second armature 74 drives the second armature rod 75 and the second steel ball 71 to move upwards, the second steel ball 71 is separated from the conical surface of the oil outlet of the second oil outlet orifice 921, and high-pressure fluid in the air control chamber 4 flows into the second pressure relief chamber 80 through the transition flow passage 60 and the second oil outlet orifice 921. The pressure in the gas control chamber 4 is reduced, the gas control valve is moved upwards, the high-pressure gas chamber 10 is communicated with the gas jet 131, and the high-pressure gas is injected into the combustion chamber of the engine.
Preferably, the flow rate of the second oil inlet throttle hole 911 is smaller than that of the second oil outlet throttle hole 921, so that quick pressure relief is realized, and high-pressure fuel gas is quickly injected.
The injection time of the high-pressure fuel gas and the fuel oil can be controlled by controlling the electrification of the first electromagnet 63 and the second electromagnet 73. In this embodiment, the built-in oil control valve assembly 6 and the external air valve assembly 7 are two independent structures, so that the two valve assemblies can be controlled to be powered on or powered off respectively, and the injection of fuel oil and high-pressure fuel gas can be controlled respectively. The on-off interval and the time length of the built-in oil control valve assembly 6 and the external air control valve assembly 7 are controlled, and the dual-fuel (high-pressure gas fuel injected after the liquid fuel injected first is ignited) injection mode can be switched.
Preferably, the built-in oil control valve assembly 6 and the external air control valve assembly 7 are coaxially arranged, so that the space of the injector body 1 can be reasonably and effectively utilized, and the overall size of the fuel injector is reduced.
Further, a first adjusting shim 5a is installed between the built-in oil control valve assembly 6 and the injector lower body 121 for compensating production and assembly tolerances of the built-in oil control valve assembly 6 and the injector lower body 121. And a second adjusting gasket 5b is arranged between the external air control valve assembly 7 and the upper injector body and is used for compensating production and assembly tolerances of the external air control valve assembly 7 and the upper injector body. The first and second spacers 5a and 5b are each preferably a plate spring.
The dual fuel injector also includes a communication flowpath 50 and an oil drain flowpath 100. The communication flow passage 50 communicates the first oil outlet orifice 812 and the second oil outlet orifice 921. The communication flow passage 50 opens in the injector upper body assembly 11. One end of the communication flow passage 50 communicates with the second pressure relief chamber 80, and the other end communicates with the second pressure relief chamber 80. One port of the oil discharge flow passage 100 communicates with the first pressure relief chamber 70, and the other port terminates at the outer wall of the injector body 1. The control fluid in the second pressure relief chamber 80 flows into the first pressure relief chamber 70 and eventually out of the dual fuel injector via the drain flowpath 100.
The dual fuel injector also includes an oil intake runner 30. The oil inlet port of the oil inlet flow passage 30 is stopped at the outer wall of the injector lower body 121, and the other end is communicated with the fuel cavity 20. The oil inlet flow passage 30 includes a first oil inlet section 3a, a second oil inlet section 3b, a third oil inlet section 3c, and a fourth oil inlet section 3d, which are sequentially communicated. The first oil intake section 3a opens on the injector lower body 121. The second oil inlet section 3b is opened on the air control oil inlet plate 91 in a penetrating manner. The third oil inlet section 3c opens through the needle valve housing 13. The fourth oil inlet section 3d is provided on the gas control needle valve 2 and communicates with the fuel chamber 20. The oil inlet flow passage 30 further includes a first branch 3e and a second branch portion. The first branch 3e is opened in the injector lower body 121 and communicates with the first oil inlet orifice 811 of the oil control inlet plate 81, i.e., the control fluid of the oil control chamber 5 is fuel oil. The second branch 3f is opened on the air control oil inlet plate 91 and is communicated with the air control cavity 4, namely, the control fluid in the air control cavity 4 is fuel oil.
The dual fuel injector also includes a gas joint 90. The gas joint 90 is provided on the injector upper body assembly 11. The gas joint 90 and the injector body 1 are provided with an inlet flow passage 40. The intake runner 40 includes a first intake section 4a, a second intake section 4b, a third intake section 4c, a fourth intake section 4d, and a fifth intake section 4e, which are communicated in this order. The first air inlet section 4a opens through the gas connection 90. The second air inlet section 4b opens into the injector upper body assembly 11. The third intake section 4c opens through the injector lower body 121. The fourth air intake section 4d is opened on the air control oil intake plate 91 in a penetrating manner. The fifth gas inlet section 4e is provided on the needle valve housing 13 and communicates with the high-pressure gas chamber 10. High-pressure fuel gas in the high-pressure fuel gas source enters the high-pressure fuel gas cavity 10 through the air inlet flow passage 40.
Further, the upper body of the ejector is further provided with a wire through hole 111 for routing a control driving wire of the built-in oil control valve assembly 6. The external air control valve assembly 7 is arranged at the upper end of the upper body of the ejector through a third body fastening cap 1 c. The control driving wire of the external air control valve assembly 7 directly extends out of the upper end of the third body fastening cap 1c, and the wiring is convenient.
The embodiment also provides an engine which comprises the dual-fuel injector and has a dual-fuel (high-pressure gas fuel injected after pilot injection of liquid fuel injected firstly) injection mode, and a user can flexibly select the combustion mode of the engine according to the fuel price.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A dual fuel injector, comprising:
the ejector comprises an ejector body (1) and a control device, wherein the ejector body (1) comprises an ejector upper body assembly (11), an ejector lower body assembly (12) and a needle valve sleeve (13) which are sequentially arranged from top to bottom, and the needle valve sleeve (13) is provided with an air jet (131);
the gas control needle valve (2) penetrates through the needle valve sleeve (13), a high-pressure gas cavity (10) is formed between the gas control needle valve (2) and the needle valve sleeve (13), and the head of the gas control needle valve (2) extends out of the needle valve sleeve (13) and is provided with an oil injection port (21);
the oil control needle valve (3) penetrates into the gas control needle valve (2), the tail part of the oil control needle valve (3) extends into the ejector lower body component (12), and a fuel oil cavity (20) is formed between the oil control needle valve (3) and the gas control needle valve (2);
a gas control cavity (4) which is associated with the gas control needle valve (2);
an oil control chamber (5) associated with the oil control needle valve (3);
a built-in oil control valve component (6) which is embedded in the injector lower body component (12) and can change the pressure of control fluid in the oil control cavity (5) to cause the oil control needle valve (3) to move so as to connect or disconnect the fuel cavity (20) and the fuel injection port (21);
the external gas control valve assembly (7) is arranged at the upper end of the ejector upper body assembly (11) and can change the pressure of control fluid in the gas control cavity (4) to cause the gas control needle valve (2) to move so as to communicate or cut off the high-pressure gas cavity (10) and the gas jet opening (131).
2. The dual fuel injector of claim 1, characterized in that the injector lower body assembly (12) comprises an injector lower body (121) and an oil control plate assembly (8), the oil control plate assembly (8) is seated in the injector lower body (121), the oil control cavity (5) is opened on the oil control plate assembly (8), and the tail of the oil control needle valve (3) extends into the injector lower body (121) and is exposed to the oil control cavity (5).
3. The dual fuel injector of claim 2, characterized in that the built-in oil control valve assembly (6) is arranged in the injector lower body (121) and is positioned at one side of the oil control plate assembly (8) far away from the oil control needle valve (3), a first oil inlet orifice (811) and a first oil outlet orifice (812) which are communicated with the oil control cavity (5) are formed on the oil control plate assembly (8), a first pressure relief cavity (70) is formed between the oil control plate assembly (8) and the injector lower body (121), the built-in oil control valve assembly (6) can cut off or open an oil outlet of the first oil outlet orifice (812), and gas control fluid in the gas control cavity (4) can flow into the first pressure relief cavity (70) through the first oil outlet orifice (812).
4. The dual fuel injector of claim 3 wherein the flow rate of control fluid at the first oil intake orifice (811) is less than the flow rate of control fluid at the first oil outlet orifice (812).
5. The dual fuel injector of claim 3, further comprising a gas control plate assembly (9), wherein the gas control plate assembly (9) comprises a gas control oil inlet plate (91), the gas control oil inlet plate (91) is disposed between the injector lower body assembly (12) and the needle valve sleeve (13), the oil control needle valve (3) penetrates through the gas control oil inlet plate (91), a support sleeve (122) is sleeved on the oil control needle valve (3), and the gas control cavity (4) is formed among the support sleeve (122), the gas control oil inlet plate (91) and the gas control needle valve (2).
6. The dual-fuel injector of claim 5, characterized in that the gas control oil inlet plate (91) is provided with a second oil inlet orifice (911) communicated with the gas control cavity (4), the gas control plate assembly (9) further comprises a gas control oil outlet plate (92), the gas control oil outlet plate (92) is seated in the injector upper body assembly (11), the gas control oil outlet plate (92) is provided with a second oil outlet orifice (921) communicated with the gas control cavity (4), the external gas control valve assembly (7) is arranged on the upper side of the gas control oil outlet plate (92), the external gas control valve assembly (7) can cut off or open an oil outlet of the second oil outlet orifice (921), and a second pressure relief cavity (80) is formed between the external gas control valve assembly (7) and the injector upper body assembly (11), and the control fluid in the air control cavity (4) can flow into the second pressure relief cavity (80) through the second oil outlet throttling hole (921).
7. The dual fuel injector of claim 6 wherein the flow rate of control fluid at the second oil intake orifice (911) is less than the flow rate of control fluid at the second oil exit orifice (921).
8. The dual fuel injector of claim 6, further comprising a communication flow passage (50) and a drain flow passage (100), the communication flow passage (50) communicating the first oil outlet orifice (812) and the second oil outlet orifice (921), one port of the drain flow passage (100) communicating with the first oil outlet orifice (812) or the second oil outlet orifice (921), and the other port terminating at an outer wall of the injector body (1).
9. The dual fuel injector of any of the claims 1-8, further comprising an oil inlet flow passage (30), the oil inlet flow passage (30) being configured to communicate the fuel chamber (20), the gas control chamber (4) and the oil control chamber (5) with an oil source, respectively.
10. An engine comprising a dual fuel injector as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022372306.3U CN213392462U (en) | 2020-10-22 | 2020-10-22 | Dual-fuel injector and engine |
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| CN202022372306.3U CN213392462U (en) | 2020-10-22 | 2020-10-22 | Dual-fuel injector and engine |
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| CN213392462U true CN213392462U (en) | 2021-06-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623104A (en) * | 2021-10-08 | 2021-11-09 | 中国重汽集团重庆燃油喷射系统有限公司 | Metering valve assembly for dual fuel injector |
| CN114483397A (en) * | 2021-12-29 | 2022-05-13 | 潍柴动力股份有限公司 | Dual-fuel injection device and dual-fuel engine |
| CN114992021A (en) * | 2022-06-15 | 2022-09-02 | 一汽解放汽车有限公司 | Variable injector of injection rate and engine |
-
2020
- 2020-10-22 CN CN202022372306.3U patent/CN213392462U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623104A (en) * | 2021-10-08 | 2021-11-09 | 中国重汽集团重庆燃油喷射系统有限公司 | Metering valve assembly for dual fuel injector |
| CN114483397A (en) * | 2021-12-29 | 2022-05-13 | 潍柴动力股份有限公司 | Dual-fuel injection device and dual-fuel engine |
| CN114483397B (en) * | 2021-12-29 | 2023-03-24 | 潍柴动力股份有限公司 | Dual-fuel injection device and dual-fuel engine |
| CN114992021A (en) * | 2022-06-15 | 2022-09-02 | 一汽解放汽车有限公司 | Variable injector of injection rate and engine |
| CN114992021B (en) * | 2022-06-15 | 2023-12-29 | 一汽解放汽车有限公司 | Injector with variable oil injection rate and engine |
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