Fuel injection device, engine and vehicle

Abstract

The utility model belongs to the technical field of vehicles, and discloses a fuel injection device, an engine and a vehicle. The fuel injection device comprises a fuel injector and a heat insulation sleeve. The fuel injector comprises a fuel injector main body and a fuel nozzle which are connected with each other; a first lap joint face is formed at the position, at the joint of the burner body and the burner nozzle, of the burner body, or the first lap joint face is formed above the position, at the joint of the burner body and the burner nozzle, of the burner body. The spraying and burning nozzle is inserted into the heat insulation sleeve in an interference mode, the spraying end of the spraying and burning nozzle extends out of the heat insulation sleeve, and the first lap joint face is in lap joint with the heat insulation sleeve; the heat insulation sleeve is made of heat insulation materials. By adopting the fuel injection device, the overall temperature of the fuel injection nozzle can be effectively reduced so as to reduce the phenomena of carbon deposition and even blockage of the fuel injection nozzle, and the fuel injection device is simple in structure, convenient to manufacture and assemble and good in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially relates to fuel injection device, engine and vehicle. BACKGROUND

[0002] Fuel injection device is the important component of engine, plays the vital role to the normal work of engine. The engine cylinder cover is provided with mounting hole, and fuel injection device is installed in the mounting hole.

[0003] In order to cool fuel injector, usually set up heat conduction bushing between fuel injector and the inner wall of mounting hole, utilize heat conduction bushing to block high temperature mixture in combustion chamber to enter the gap between fuel injector and the inner wall of mounting hole, and utilize heat conduction bushing to conduct the heat in combustion chamber and the heat of fuel injector especially nozzle part to cylinder block, cool fuel injector, namely fuel injection device includes fuel injector and heat conduction bushing.

[0004] For diesel-gas dual fuel engine, the effect of cooling fuel injector by the above-mentioned mode is limited, and the fuel injection nozzle of fuel injector still exists the phenomenon of easy carbon deposition and even blockage after the continuous operation of engine for a period of time, which leads to the power torque reduction of engine. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of fuel injection device, engine and vehicle to solve the above-mentioned problems existing in prior art.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Fuel injection device, comprising:

[0008] Fuel injector, including connected fuel injector main body and fuel injection nozzle;

[0009] The fuel injector main body forms the first lap joint surface at the connection of the fuel injector main body and the fuel injection nozzle;Or, the fuel injector main body forms the first lap joint surface above the connection of the fuel injector main body and the fuel injection nozzle;

[0010] Heat insulation sleeve, the fuel injection nozzle is inserted in the heat insulation sleeve with interference and the injection end of the fuel injection nozzle extends from the heat insulation sleeve, and the first lap joint surface is lapped on the heat insulation sleeve;The heat insulation sleeve is made of heat insulation material.

[0011] As a preferred scheme of the fuel injection device, the heat insulation sleeve comprises a first heat insulation part and a second heat insulation part connected together, the fuel nozzle is inserted into the second heat insulation part in an interference fit, the injection end of the fuel nozzle extends out of the second heat insulation part, the first lap joint surface is lapped on the first heat insulation part, and the outer diameter of the first heat insulation part is larger than the outer diameter of the second heat insulation part.

[0012] As a preferred scheme of the fuel injection device, the heat insulation sleeve is made of a carbon fiber material, or the heat insulation sleeve is made of a hydrogel material.

[0013] As a preferred scheme of the fuel injection device, at least an end surface of the heat insulation sleeve close to the injection end of the fuel nozzle is coated with an antioxidant coating.

[0014] As a preferred scheme of the fuel injection device, the fuel injection device further comprises a heat conduction sleeve, the heat conduction sleeve is formed with a second lap joint surface, the heat insulation sleeve is inserted into the heat conduction sleeve in an interference fit, and the heat insulation sleeve and / or the fuel nozzle body is lapped on the second lap joint surface, and the injection end of the fuel nozzle extends out of the heat conduction sleeve.

[0015] As a preferred scheme of the fuel injection device, the heat conduction sleeve comprises a first heat conduction part and a second heat conduction part connected together, the inner side wall of the first heat conduction part and the inner side wall of the second heat conduction part are connected through the second lap joint surface, the fuel nozzle body is inserted into the first heat conduction part in a clearance fit, the heat insulation sleeve is inserted into the second heat conduction part in an interference fit, and the injection end of the fuel nozzle extends out of the second heat conduction part.

[0016] As a preferred scheme of the fuel injection device, the heat conduction sleeve is made of brass, or the heat conduction sleeve is made of stainless steel.

[0017] As a preferred scheme of the fuel injection device, the fuel nozzle has two injection holes, one of which is used for injecting fuel oil, and the other of which is used for injecting fuel different from the fuel oil.

[0018] An engine comprising a cylinder head, a cylinder body and a piston axially movably mounted in the cylinder body, a combustion chamber being formed between the cylinder head, the piston and the cylinder body, and the fuel injection device described above, the cylinder head is provided with a mounting hole in communication with the combustion chamber, the heat insulation sleeve is fixedly mounted in the mounting hole, and the injection end of the fuel nozzle extends into the combustion chamber.

[0019] A vehicle comprising the engine described above.

[0020] The utility model discloses the beneficial effect:

[0021] The utility model provides a fuel injection device, engine and vehicle. The fuel injection device adopts the heat insulating material to make heat insulating cover, inserts the fuel nozzle interference in the heat insulating cover, makes the heat insulating cover can effectively insulate the high temperature mixed gas in the combustion chamber and the outer peripheral wall of fuel nozzle direct contact, to avoid the heat conduction heating to fuel nozzle, and the heat insulating cover can effectively insulate the outer peripheral wall of cylinder cover and fuel nozzle direct contact, to avoid the heat conduction heating to fuel nozzle, and the heat insulating cover itself does not conduct heat, thereby can effectively reduce the overall temperature of fuel nozzle to reduce the phenomenon that the carbon deposit even blockage of fuel nozzle occurs, secondly, the temperature of fuel that the fuel nozzle is sent to the injection end of fuel nozzle is relatively low, and the fuel that is sent to the injection end of fuel nozzle can reduce the temperature of the injection end of fuel nozzle, thereby can further reduce the overall temperature of fuel nozzle to reduce the phenomenon that the carbon deposit even blockage of fuel nozzle occurs, secondly, the first lap joint surface is set to lap on the heat insulating cover, can effectively limit the relative position of fuel injector and heat insulating cover, and can avoid the gravity of fuel injector after long time work of fuel injection device influence the reliability of interference fit of fuel nozzle and heat insulating cover, secondly, the injection end of fuel nozzle is set to go out heat insulating cover and extend into the combustion chamber, can avoid the influence of heat insulating cover to the fuel injection into the combustion chamber.

[0022] Thus, the fuel injection device can effectively reduce the overall temperature of the fuel nozzle to reduce the phenomenon that the carbon deposit even blockage of the fuel nozzle occurs, has simple structure, is convenient for manufacturing and assembling, and has good reliability. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the structure schematic of the fuel injection device provided by the embodiment of the utility model Figure 1 ;

[0024] Figure 2 is the structure schematic of the fuel injection device provided by the embodiment of the utility model Figure 2 ;

[0025] Figure 3 is the structure schematic of the heat insulating cover of the fuel injection device provided by the embodiment of the utility model;

[0026] Figure 4 is the structure schematic of the heat conducting cover of the fuel injection device provided by the embodiment of the utility model.

[0027] In the drawing:

[0028] 1, fuel injector; 11, fuel nozzle; 111, first lap joint surface; 12, fuel nozzle;

[0029] 2, heat insulating cover; 21, first heat insulating part; 211, third lap joint surface; 22, second heat insulating part;

[0030] 3, heat conducting sleeve; 31, first heat conducting part; 32, second heat conducting part; 321, second lapping surface; 322, fifth lapping surface;

[0031] 4, cylinder head; 41, mounting hole; 411, first hole; 412, second hole; 413, fourth lapping surface. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description, not all the structures.

[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature in the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0036] The utility model provides fuel injection device and engine, such as Figure 1 and Figure 2As shown, the engine includes a cylinder head 4, a cylinder block, and a piston axially movably mounted in the cylinder block. A combustion chamber is formed between the cylinder head 4, the piston, and the cylinder block. The engine also includes a fuel injection device. The cylinder head 4 has a mounting hole 41 that communicates with the combustion chamber. The fuel injection device passes through the mounting hole 41 and is used to inject fuel into the combustion chamber.

[0037] The following description uses a fuel injection device capable of injecting two types of fuel as an example. The fuel injector 1 of this device has two injection channels, each with an injection orifice at its output end. For ease of description, the two injection channels are referred to as the first injection channel and the second injection channel, respectively. The injection orifice corresponding to the first injection channel is referred to as the first injection orifice, and the injection orifice corresponding to the second injection channel is referred to as the second injection orifice. The first injection channel injects a first fuel, such as diesel or gasoline, into the combustion chamber through the first injection orifice. The second injection channel injects a second fuel, which is a different fuel from the first fuel, such as natural gas or methanol, into the combustion chamber through the second injection orifice. The first fuel is primarily used to ignite the second fuel. The specific structure of the fuel injector 1 with two injection channels is prior art and will not be described further here.

[0038] It should be noted that the fuel injector 1 of this fuel injection device can also be a single fuel injector, that is, the fuel injector 1 has only one injection channel, such as an oil injector. The specific structure of the single fuel injector is prior art, so it will not be described in detail here.

[0039] like Figures 1-3 As shown, the fuel injection device includes a fuel injector 1 and a heat insulation sleeve 2. The fuel injector 1 includes a burner body 11 and a burner nozzle 12 connected together. The burner body 11 forms a first overlapping surface 111 at the connection between the burner body 11 and the burner nozzle 12, or the burner body 11 forms a first overlapping surface 111 above the connection between the burner body 11 and the burner nozzle 12. The burner nozzle 12 is interference-fitted into the heat insulation sleeve 2, and the injection end of the burner nozzle 12 extends out of the heat insulation sleeve 2, with the first overlapping surface 111 overlapping the heat insulation sleeve 2. The heat insulation sleeve 2 is made of heat-insulating material. Specifically, the heat insulation sleeve 2 is fixedly installed between the inner peripheral wall of the mounting hole 41 and the outer peripheral wall of the burner nozzle 12. The injection end of the burner nozzle 12 extends out of the heat insulation sleeve 2 and into the combustion chamber. The first injection channel and the second injection channel are both formed inside the burner body 11 and the burner nozzle 12 of the fuel injector 1.

[0040] The fuel injection device adopts the heat insulation sleeve 2 made of heat insulation material, the fuel nozzle 12 is inserted into the heat insulation sleeve 2 in interference, so that the heat insulation sleeve 2 can effectively isolate the high-temperature mixed gas in the combustion chamber from directly contacting the outer peripheral wall of the fuel nozzle 12, to avoid heat conduction and temperature rise of the fuel nozzle 12, and the heat insulation sleeve 2 can effectively isolate the cylinder cover 4 from directly contacting the outer peripheral wall of the fuel nozzle 12, to avoid heat conduction and temperature rise of the fuel nozzle 12, and the heat insulation sleeve 2 itself does not conduct heat, thereby effectively reducing the overall temperature of the fuel nozzle 12 to reduce the phenomenon of carbon deposition or even blockage of the fuel nozzle 12; secondly, the temperature of the fuel delivered to the injection end of the fuel nozzle 12 by the fuel injector body 11 is relatively low, and the fuel delivered to the injection end of the fuel nozzle 12 can reduce the temperature of the injection end of the fuel nozzle 12, thereby further reducing the overall temperature of the fuel nozzle 12 to reduce the phenomenon of carbon deposition or even blockage of the fuel nozzle 12; secondly, the first lap surface 111 is arranged to lap on the heat insulation sleeve 2, which can effectively limit the relative position of the fuel injector 1 and the heat insulation sleeve 2, and can avoid the influence of the self-gravity of the fuel injector 1 on the reliability of the interference fit between the fuel nozzle 12 and the heat insulation sleeve 2 after the fuel injection device works for a long time; secondly, the injection end of the fuel nozzle 12 penetrates through the heat insulation sleeve 2 and extends into the combustion chamber, which can avoid the influence of the heat insulation sleeve 2 on the fuel in the injection channel passing through the injection hole and being injected into the combustion chamber.

[0041] Therefore, by adopting the fuel injection device, the overall temperature of the fuel nozzle 12 can be effectively reduced to reduce the phenomenon of carbon deposition or even blockage of the fuel nozzle 12, the structure is simple, convenient to manufacture and assemble, and the reliability is good.

[0042] In some embodiments, for the fuel injector body 11 forming the first lap surface 111 at the connection between the fuel injector body 11 and the fuel nozzle 12, the fuel nozzle 12 is inserted into the heat insulation sleeve 2 in interference, and the injection end of the fuel nozzle 12 extends out of the heat insulation sleeve 2. In other embodiments, for the fuel injector body 11 forming the first lap surface 111 above the connection between the fuel injector body 11 and the fuel nozzle 12, the fuel nozzle 12 is inserted into the heat insulation sleeve 2 in interference, and the injection end of the fuel nozzle 12 extends out of the heat insulation sleeve 2, and the fuel injector body 11 is partially inserted into or inserted into the heat insulation sleeve 2 in interference.

[0043] Optionally, as Figures 1-3As shown, the heat insulation sleeve 2 comprises a first heat insulation part 21 and a second heat insulation part 22 connected with each other, the injection nozzle 12 is inserted into the second heat insulation part 22 in an interference fit, the injection end of the injection nozzle 12 extends out of the second heat insulation part 22, the first lap joint surface 111 is lapped on the first heat insulation part 21, and the outer diameter of the first heat insulation part 21 is larger than that of the second heat insulation part 22. In this way, the contact area of the heat insulation sleeve 2 and the first lap joint surface 111 can be increased, so that the effect of reducing the overall temperature of the injection nozzle 12 can be further improved. Specifically, for the case that the first lap joint surface 111 is formed on the injection nozzle body 11 at the connection between the injection nozzle body 11 and the injection nozzle 12, the injection nozzle 12 is inserted into the first heat insulation part 21 and the second heat insulation part 22 in an interference fit, and the injection end of the injection nozzle 12 extends out of the second heat insulation part 22. For the case that the first lap joint surface 111 is formed above the connection between the injection nozzle body 11 and the injection nozzle 12, the injection nozzle 12 is inserted into the second heat insulation part 22 in an interference fit, and the injection end of the injection nozzle 12 extends out of the second heat insulation part 22; the injection nozzle body 11 is partially inserted into the first heat insulation part 21 in an interference fit or clearance fit, or the injection nozzle body 11 is partially inserted into the first heat insulation part 21 and the second heat insulation part 22 in an interference fit or clearance fit. Alternatively, the heat insulation sleeve 2 is in a cylindrical shape, and the first lap joint surface 111 is lapped on the top of the heat insulation sleeve 2 along the axial direction.

[0044] Preferably, the first heat insulation part 21 and the second heat insulation part 22 of the heat insulation sleeve 2 are integrally formed. This can reduce the number of components, facilitate assembly, and effectively improve the structural strength and service life of the heat insulation sleeve 2.

[0045] Preferably, the heat insulation sleeve 2 is made of a carbon fiber material. The heat insulation sleeve 2 made of the carbon fiber material can effectively insulate the injection nozzle 12; secondly, the heat insulation sleeve 2 made of the carbon fiber material has a certain elastic deformation capacity, which facilitates the interference fit of the injection nozzle 12 into the heat insulation sleeve 2. Specifically, the carbon fiber material is silicon carbide fiber or carbon nitride fiber, etc. Alternatively, the heat insulation sleeve 2 is made of a hydrogel material. The heat insulation sleeve 2 made of the hydrogel material can also effectively insulate the injection nozzle 12 and facilitate the interference fit of the injection nozzle 12 into the heat insulation sleeve 2.

[0046] Preferably, at least the end surface of the heat insulation sleeve 2 near the injection end of the injection nozzle 12 is coated with an anti-oxidation coating. It can be understood that the end surface of the heat insulation sleeve 2 near the injection end of the injection nozzle 12 directly contacts the high-temperature mixed gas in the combustion chamber, so the anti-oxidation coating can effectively improve the reliability and service life of the heat insulation sleeve 2. The anti-oxidation coating is an anti-oxidation uranium tantalum film layer or a uranium nitride passivation layer, etc. It can be understood that the anti-oxidation coating can also be coated on the inner circumferential wall of the heat insulation sleeve 2 according to the actual working condition requirements; and / or the anti-oxidation coating can also be coated on the outer circumferential wall of the heat insulation sleeve 2; and / or among the two end surfaces connecting the inner circumferential wall of the heat insulation sleeve 2 and the outer circumferential wall of the heat insulation sleeve 2, the anti-oxidation coating can be coated on the end surface away from the injection end of the injection nozzle 12.

[0047] Specifically, for the heat shield 2 made of carbon fiber material and the end face of the heat shield 2 close to the injection end of the injection nozzle 12 coated with an antioxidant coating, the manufacturing process of the heat shield 2 is as follows: according to the size of the expected heat shield 2, the carbon fiber material is woven into a semi-finished product by using 2.5D weaving technology; then the semi-finished product is densified by high-temperature deposition of carbon atoms, so that the density of the semi-finished product is greater than or equal to the set density value; then the semi-finished product is rough machined according to the size of the expected heat shield 2, so that the single side allowance of the semi-finished product is the preset allowance; then the semi-finished product is ground and finished according to the size of the expected heat shield 2, so that the size of the semi-finished product is completely consistent with the size of the expected heat shield 2; then the semi-finished product is heated and cured at a set temperature value; then the corresponding end face of the semi-finished product is coated with an antioxidant coating to obtain the expected heat shield 2. The 2.5D weaving technology is a prior art, so it will not be described here. The specific way of densification is a prior art, so it will not be described here. The set density value is an empirical value obtained from previous experiments or a human set value, and an exemplary set density value is 1.4 g / cm3. The preset allowance is an empirical value obtained from previous experiments or a human set value, and an exemplary preset allowance is 0.1 mm. The set temperature value is an empirical value obtained from previous experiments or a human set value, and an exemplary set temperature value is 1450°C.

[0048] Optionally, as shown in Figure 2 and Figure 4 , the fuel injection device further comprises a heat conducting sleeve 3, the heat conducting sleeve 3 is formed with a second lap joint surface 321, the heat shield 2 is inserted into the heat conducting sleeve 3 with interference, the heat shield 2 and / or the injector body 11 lap the second lap joint surface 321, and the injection end of the injection nozzle 12 protrudes out of the heat conducting sleeve 3. By providing the heat conducting sleeve 3, the heat of the injection nozzle 12 and the outer periphery of the heat shield 2 can be transmitted to the cylinder head 4 through the heat conducting sleeve 3, to further improve the effect of reducing the overall temperature of the injection nozzle 12; secondly, the heat shield 2 and / or the injector body 11 lap the second lap joint surface 321, which can limit the relative position of the fuel injector 1, the heat shield 2 and the heat conducting sleeve 3.

[0049] Optionally, as shown in Figure 2 and Figure 4As shown, the heat conduction sleeve 3 comprises a first heat conduction part 31 and a second heat conduction part 32 connected together, the inner side wall of the first heat conduction part 31 and the inner side wall of the second heat conduction part 32 are connected by a second lap joint surface 321, the fuel injector body 11 is gap-inserted and fitted with the first heat conduction part 31, the heat insulation sleeve 2 is interference-inserted in the second heat conduction part 32, and the injection end of the fuel injection nozzle 12 extends out of the second heat conduction part 32. In this way, the effect of the heat conduction sleeve 3 on the overall fuel injector 1 can be improved, thereby further reducing the phenomenon of carbon deposition or even blockage of the fuel injection nozzle 12. As an alternative, the top surface of the heat conduction sleeve 3 forms the second lap joint surface 321, and the fuel injector body 11 is gap-inserted in the mounting hole 41.

[0050] Preferably, the first heat conduction part 31 and the second heat conduction part 32 of the heat conduction sleeve 3 are integrally formed. This can reduce the number of parts, facilitate assembly, and effectively improve the structural strength and service life of the heat conduction sleeve 3. As an alternative, the first heat conduction part 31 and the second heat conduction part 32 of the heat conduction sleeve 3 are connected to form a whole by welding or other methods.

[0051] Preferably, the heat conduction sleeve 3 is made of brass. Brass has good heat conductivity and corrosion resistance. As an alternative, the heat conduction sleeve 3 is made of stainless steel. Stainless steel has good heat conductivity, corrosion resistance, and high temperature resistance.

[0052] In some embodiments, as shown in Figure 1 and Figure 3 The fuel injection device comprises the fuel injector 1 and the heat insulation sleeve 2, and the heat insulation sleeve 2 is directly fixed and installed in the mounting hole 41. Specifically, the heat insulation sleeve 2 is fixedly connected to the inner peripheral wall of the mounting hole 41 by thread connection or clamping, etc.; the remaining area of the heat insulation sleeve 2 except the area connected to the inner peripheral wall of the mounting hole 41 is gap-fitted with the mounting hole 41. Taking the heat insulation sleeve 2 fixedly connected to the inner peripheral wall of the mounting hole 41 by thread connection as an example, the outer peripheral wall of the heat insulation sleeve 2 is provided with a first external thread, the inner peripheral wall of the mounting hole 41 is provided with an internal thread, and the first external thread and the internal thread are threadedly connected. To fix the heat insulation sleeve 2 to the inner peripheral wall of the mounting hole 41. Further preferably, as shown in Figure 1 and Figure 3 The heat insulation sleeve 2 comprises a first heat insulation part 21 and a second heat insulation part 22 connected together, the end surface of the first heat insulation part 21 close to the second heat insulation part 22 along the axial direction forms a third lap joint surface 211, the inner peripheral wall of the mounting hole 41 forms a fourth lap joint surface 413, and when the first external thread and the internal thread are threadedly connected, the third lap joint surface 211 is lapped with the fourth lap joint surface 413.

[0053] In some embodiments, as shown in Figure 2 and Figure 4As shown in the drawings, the fuel injection device comprises a fuel injector 1, a heat insulation sleeve 2 and a heat conduction sleeve 3, and the heat conduction sleeve 3 is fixedly installed on the inner circumferential wall of the mounting hole 41. It can be understood that the heat conduction sleeve 3 is located between the heat insulation sleeve 2 and the inner circumferential wall of the mounting hole 41. Specifically, the heat conduction sleeve 3 is fixedly connected to the inner circumferential wall of the mounting hole 41 by thread connection or clamping, etc. Taking the heat conduction sleeve 3 as an example which is fixedly connected to the inner circumferential wall of the mounting hole 41 by thread connection, the outer circumferential wall of the heat conduction sleeve 3 is provided with a second external thread, the inner circumferential wall of the mounting hole 41 is provided with an internal thread, and the second external thread and the internal thread are threadedly matched. To fix the heat conduction sleeve 3 to the inner circumferential wall of the mounting hole 41. Further preferably, as shown in the drawings, Figure 2 and Figure 4 As shown in the drawings, the heat conduction sleeve 3 comprises a first heat conduction part 31 and a second heat conduction part 32 connected together, the outer circumferential wall of the first heat conduction part 31 and the outer circumferential wall of the second heat conduction part 32 are connected by a fifth lap joint surface 322, and the inner circumferential wall of the mounting hole 41 is formed with a fourth lap joint surface 413. When the second external thread and the internal thread are threadedly matched, the fifth lap joint surface 322 is lapped on the fourth lap joint surface 413.

[0054] Specifically, as shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, the mounting hole 41 comprises a first hole 411 and a second hole 412 connected together, the connection of the first hole 411 and the second hole 412 forms a fourth lap joint surface 413, the fuel injector body 11 is located in the first hole 411, and the hole diameter of the first hole 411 is larger than that of the second hole 412.

[0055] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, the center axis of the fuel injector 1, the center axis of the heat insulation sleeve 2 and the center axis of the heat conduction sleeve 3 are collinear.

[0056] Specifically, at least one combustion chamber is provided with at least two fuel injection devices. During engine operation, at least two fuel injection devices can be controlled to work alternately according to power demand, so as to avoid that a single fuel injection device works in a high temperature environment for a long time, thereby prolonging the service life of the fuel injection device.

[0057] Among them, the specific structure of the cylinder body 4 belongs to the prior art, which will not be repeated here.

[0058] The utility model also provides a vehicle, including above -mentioned engine. The vehicle has same technical effect with above -mentioned fuel injection device, and will not be repeated here.

[0059] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A fuel injection device, characterized in that, include: A fuel injector (1) includes a burner body (11) and a burner nozzle (12) connected to each other; The burner body (11) forms a first overlapping surface (111) at the connection between the burner body (11) and the burner nozzle (12); or, the burner body (11) forms a first overlapping surface (111) above the connection between the burner body (11) and the burner nozzle (12); The heat insulation sleeve (2) is provided with the burner nozzle (12) being inserted into the heat insulation sleeve (2) and the spraying end of the burner nozzle (12) extending out of the heat insulation sleeve (2). The first overlapping surface (111) overlaps the heat insulation sleeve (2). The heat insulation sleeve (2) is made of heat insulation material.

2. The fuel injection device according to claim 1, characterized in that, The heat insulation sleeve (2) includes a first heat insulation part (21) and a second heat insulation part (22) connected to each other. The burner nozzle (12) is interference-fitted into the second heat insulation part (22). The spraying end of the burner nozzle (12) extends out of the second heat insulation part (22). The first overlapping surface (111) overlaps the first heat insulation part (21). The outer diameter of the first heat insulation part (21) is larger than the outer diameter of the second heat insulation part (22).

3. The fuel injection device according to claim 1, characterized in that, The heat insulation sleeve (2) is made of carbon fiber material; or, the heat insulation sleeve (2) is made of hydrogel material.

4. The fuel injection device according to claim 1, characterized in that, The heat insulation sleeve (2) is coated with an antioxidant coating at least on the end face near the injection end of the burner nozzle (12).

5. The fuel injection device according to claim 1, characterized in that, The fuel injection device further includes a heat-conducting sleeve (3), which has a second overlapping surface (321). The heat-insulating sleeve (2) is interference-fitted into the heat-conducting sleeve (3). The heat-insulating sleeve (2) and / or the burner body (11) overlap the second overlapping surface (321). The injection end of the burner nozzle (12) extends out of the heat-conducting sleeve (3).

6. The fuel injection device according to claim 5, characterized in that, The heat-conducting sleeve (3) includes a first heat-conducting part (31) and a second heat-conducting part (32) connected to each other. The inner sidewall of the first heat-conducting part (31) and the inner sidewall of the second heat-conducting part (32) are connected through the second overlapping surface (321). The burner body (11) is gapped and fitted with the first heat-conducting part (31). The heat insulation sleeve (2) is interference-fitted into the second heat-conducting part (32). The injection end of the burner nozzle (12) extends out of the second heat-conducting part (32).

7. The fuel injection device according to claim 5, characterized in that, The heat-conducting sleeve (3) is made of brass; or, the heat-conducting sleeve (3) is made of stainless steel.

8. The fuel injection device according to any one of claims 1-7, characterized in that, The burner nozzle (12) has two injection holes, one of which is used to inject fuel oil and the other is used to inject a fuel different from the fuel oil.

9. An engine, comprising a cylinder head (4), a cylinder block, and a piston axially movably mounted in the cylinder block, wherein a combustion chamber is formed between the cylinder head (4), the piston, and the cylinder block, characterized in that, It also includes the fuel injection device according to any one of claims 1-8, wherein the cylinder head (4) is provided with a mounting hole (41) communicating with the combustion chamber, the heat insulation sleeve (2) is fixedly installed in the mounting hole (41), and the injection end of the burner nozzle (12) extends into the combustion chamber.

10. A vehicle, characterized in that, Includes the engine as described in claim 9.

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