Fuel supply assembly of diesel engine

Abstract

The invention relates to the technical field of fuel supply, and particularly discloses a fuel supply assembly of a diesel engine, which comprises an oil tank, a low-pressure oil pipe fixedly inserted at the top of the oil tank, a fuel injection pump fixedly inserted at one end of the low-pressure oil pipe away from the oil tank, and a high-pressure oil pipe fixedly inserted at the top of the fuel injection pump, an oil injector is arranged at the end, away from the oil injection pump, of the high-pressure oil pipe, the right side of the oil injection pump is fixedly connected with an oil delivery pump, the output end of the oil delivery pump is inserted into the low-pressure oil pipe, the oil injector comprises a top shell fixedly inserted into the side, away from the oil injection pump, of the high-pressure oil pipe, and the bottom of the outer side of the top shell is detachably connected with a bottom shell. When oil injection is carried out, the ejector rod drives the bottom spring seat and the needle valve to move upwards, the heat insulation piece moves upwards to enter the pressure cavity along with the ejector rod, the heat insulation piece is prevented from influencing the oil injection path, therefore, interference on oil injection is reduced, and then the influence on the oil injection effect is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of fuel supply, in particular to a fuel supply component of a diesel engine. Background Art

[0002] The fuel supply assembly consists of fuel tank, fuel pipe, fuel pump, fuel filter, fuel injector and other parts. The fuel injector is an important part of the fuel supply assembly. It atomizes the fuel into fine oil droplets according to the characteristics of the diesel engine mixture formation, and injects it into a specific part of the combustion chamber at a specific injection speed, injection time and spray cone angle, which can ensure the effective mixing of fuel and air, thereby promoting a more complete combustion process.

[0003] Among them, the axial needle injector is widely used in diesel engines, which usually only has one spray hole. Due to the reciprocating motion of the axial needle in the spray hole, it can effectively remove carbon deposits and avoid clogging of the spray hole, thereby improving the reliability and durability of the equipment. This self-cleaning function reduces the maintenance frequency and maintenance cost, and is particularly suitable for equipment operating under harsh conditions.

[0004] When the engine is running, more heat is generated in the combustion chamber. The heat in the combustion chamber may enter the injector through the spray hole, which may easily cause high temperature inside the injector, which is not conducive to maintaining the cooling of the injector and may easily cause damage to the sealing part, thus affecting the service life of the injector. Summary of the invention

[0005] The purpose of the present invention is to provide a fuel supply assembly for a diesel engine, which can insulate the nozzle. When injecting fuel, as the top rod moves upward with the bottom spring seat and the needle valve, the thermal insulation component moves upward into the interior of the pressure chamber, avoiding the thermal insulation component from affecting the injection path, thereby reducing interference with the injection, and further avoiding affecting the injection effect, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A fuel supply assembly for a diesel engine, comprising a fuel tank, a low-pressure oil pipe is fixedly plugged into the top of the fuel tank, a fuel injection pump is fixedly plugged into the end of the low-pressure oil pipe away from the fuel tank, a high-pressure oil pipe is fixedly plugged into the top of the fuel injection pump, a fuel injector is arranged at the end of the high-pressure oil pipe away from the fuel injection pump, a fuel delivery pump is fixedly connected to the right side of the fuel injection pump, the output end of the fuel delivery pump is inserted into the low-pressure oil pipe, the fuel injector comprises a top shell fixedly plugged into the side of the high-pressure oil pipe away from the fuel injection pump, a bottom shell is detachably connected to the outer bottom of the top shell, a fuel injection seat is fixedly connected to the inside of the bottom shell, a nozzle is fixedly connected to the bottom of the fuel injection seat, a pressure chamber is opened inside the fuel injection seat, two fuel inlet passages are connected to the pressure chamber, a pressure assembly is arranged above the fuel inlet passage inside the top shell, a push rod is slidably connected to the inside of the fuel injection seat, a needle valve is fixedly connected to the bottom of the push rod, and a heat insulation member is fixedly connected to the outer wall of the needle valve.

[0007] Preferably, the inside of the oil injection seat and the top shell are both provided with oil inlet passages, and the top outer wall of the ejector rod is slidably connected to the top shell.

[0008] Preferably, the pressure assembly includes a bottom spring seat fixedly connected to the top of the top rod, and the pressure assembly also includes a top spring seat slidably connected to the inside of the top end of the top shell, and a first spring is fixedly connected between the bottom spring seat and the top spring seat.

[0009] Preferably, the thermal insulation member is high-temperature resistant thermal insulation cotton, the interior of the needle valve is hollow, and a blocking component is arranged below the top rod. The blocking component includes empty grooves opened on both sides of the needle valve, and corrugated sheets are fixedly connected to the interior of the empty grooves. The blocking component also includes a folding plate fixedly connected to the bottom of the thermal insulation member, and there are multiple folding plates. A rotating frame is arranged on the side where the multiple folding plates are close to each other, and a lifting rod is fixedly connected to the top of the rotating frame.

[0010] Preferably, a power assembly is arranged above the lifting rod, and the power assembly includes a first chamber opened inside the bottom spring seat, a first piston is arranged inside the first chamber, a small rod is fixedly connected to the top of the first piston, and a fixed block is fixedly connected to the inside of the top shell above the small rod. The power assembly also includes a second chamber opened at the top end of the lifting rod, a second piston is arranged inside the second chamber, the bottom of the second piston is fixedly connected to the lifting rod, and a medium channel is arranged between the second chamber and the first chamber.

[0011] Preferably, the second chamber and the left side of the bottom of the first chamber are both fixedly connected with ventilation pipes.

[0012] Preferably, the diameter of the first chamber is greater than the diameter of the second chamber.

[0013] Preferably, a bent frame is fixedly connected to the inner wall of the needle valve and above the corrugated sheet, the rotating frame is rotatably connected to a round rod near the gathering plate, the outer wall of the round rod is fixedly connected to the gathering plate, a torsion spring is fixedly connected between the round rod and the rotating frame, and the bottom of the bent frame is rotatably connected to a first rotating shaft.

[0014] Preferably, a pressure sensor is fixedly installed inside the top shell near the oil inlet channel, the top of the top spring seat is inclined, and a compensation component is arranged on the top of the top shell, and the compensation component includes a cylinder fixedly connected to both sides of the top shell, a third piston is arranged inside the cylinder, a moving rod is fixedly connected to the side of the third piston close to the top spring seat, a side of the moving rod away from the third piston passes through the cylinder and is fixedly connected to an extrusion frame, and a side of the cylinder away from the extrusion frame is fixedly plugged with an entry pipe.

[0015] Preferably, the bottom of the extrusion frame is arranged to be inclined, and a second rotating shaft is rotatably connected to the inclined portion of the bottom of the extrusion frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the cooperation of the fuel injector, the pressure assembly and the heat insulation, when no fuel is sprayed, the heat insulation is inside the nozzle, which can play a role in heat insulation at the nozzle. When fuel is sprayed, as the ejector moves upward with the bottom spring seat and the needle valve, the heat insulation moves upward into the pressure chamber, avoiding the heat insulation from affecting the fuel injection path, thereby reducing interference with fuel injection and avoiding affecting the fuel injection effect;

[0018] 2. Through the cooperation of the anti-blocking assembly and the power assembly, the lifting rod can be moved upward during oil injection, thereby causing the rotating frame to move upward, and then causing the retracting plate to move upward, thereby causing the heat insulation to move upward, which can speed up the upward movement of the heat insulation, so that the heat insulation can move upward into the pressure chamber more quickly during oil injection, further reducing the situation where the heat insulation affects the oil injection path, thereby further reducing the interference of the heat insulation on the oil injection, and thus avoiding affecting the oil injection effect;

[0019] 3. Since the diameter of the first chamber is larger than that of the second chamber, and the lifting rod moves faster than the ejector rod, the heat insulating member can move upward into the pressure chamber more quickly, thereby further reducing the interference of the heat insulating member on the oil injection, thereby avoiding affecting the oil injection effect;

[0020] 4. Through the action of the bending frame, the gathering plate is offset and rotated toward the lower end, which further plays the role of gathering the thermal insulation component, further reducing the influence of the thermal insulation component on the injection path, thereby further reducing the interference of the thermal insulation component on the injection, and then avoiding affecting the injection effect. Under the action of the first rotating shaft, the friction between the gathering plate and the bending frame is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is the overall main structural view of the present invention;

[0023] Figure 2 It is a partial structural schematic diagram of the fuel injector of the present invention;

[0024] Figure 3 A schematic diagram of the half-section structure of the fuel injector of the present invention

[0025] Figure 4 For the present invention Figure 3 A magnified view of point A;

[0026] Figure 5 It is a half-section structural schematic diagram of the mandrel of the present invention;

[0027] Figure 6 It is a half-section structural schematic diagram of the bottom spring seat of the present invention;

[0028] Figure 7 It is a schematic diagram of the partial structure of the torsion spring of the present invention;

[0029] Figure 8 It is a schematic diagram of the partial structure of the compensation component of the present invention.

[0030] Description of reference numerals:

[0031] 1. Fuel tank; 2. Low-pressure oil pipe; 3. Fuel injection pump; 4. High-pressure oil pipe; 5. Fuel injector; 51. Top shell; 52. Bottom shell; 53. Fuel injection seat; 54. Pressure chamber; 55. Oil inlet; 56. Push rod; 57. Needle valve; 58. Nozzle; 6. Compensation assembly; 61. Cylinder; 62. Third piston; 63. Moving rod; 64. Extrusion frame; 65. Second rotating shaft; 66. Inlet pipeline; 7. Pressure assembly; 71. Bottom spring seat; 72. Top spring seat; 73. The first spring; 8. the anti-blocking assembly; 81. the corrugated sheet; 82. the gathering plate; 83. the rotating frame; 84. the bending frame; 85. the round rod; 86. the torsion spring; 87. the first rotating shaft; 9. the power assembly; 91. the first chamber; 92. the first piston; 93. the small rod; 94. the fixing block; 95. the second chamber; 96. the second piston; 97. the medium channel; 98. the ventilation pipe; 10. the oil pump; 11. the heat insulating component; 12. the lifting rod; 13. the pressure sensor. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 5The present invention provides a technical solution: a fuel supply assembly for a diesel engine, comprising a fuel tank 1, a low-pressure fuel pipe 2 is fixedly connected to the top of the fuel tank 1, a fuel injection pump 3 is fixedly connected to the end of the low-pressure fuel pipe 2 away from the fuel tank 1, a high-pressure fuel pipe 4 is fixedly connected to the top of the fuel injection pump 3, a fuel injector 5 is arranged at the end of the high-pressure fuel pipe 4 away from the fuel injection pump 3, a fuel delivery pump 10 is fixedly connected to the right side of the fuel injection pump 3, an output end of the fuel delivery pump 10 is inserted into the interior of the low-pressure fuel pipe 2, a fuel filter can be installed at the low-pressure fuel pipe 2 to filter out impurities in diesel, and the principle and installation method of the fuel filter are mature existing technologies, so they are not described in detail, the fuel injector 5 comprises a top shell 51 fixedly connected to the side of the high-pressure fuel pipe 4 away from the fuel injection pump 3, the outer bottom of the top shell 51 is detachably connected to a bottom shell 52, the interior of the bottom shell 52 is fixedly connected to a fuel injection seat 53, the bottom of the fuel injection seat 53 A nozzle 58 is fixedly connected, and the bottom of the nozzle 58 passes through the bottom shell 52. A pressure chamber 54 is opened inside the fuel injection seat 53. Oil inlet passages 55 are opened inside the fuel injection seat 53 and the top shell 51. The two oil inlet passages 55 are connected to the pressure chamber 54, and the diesel injected by the high-pressure oil pipe 4 enters the pressure chamber 54 through the oil inlet passage 55. A pressure assembly 7 is arranged above the oil inlet passage 55 inside the top shell 51. A push rod 56 is slidably connected inside the fuel injection seat 53. A needle valve 57 is fixedly connected to the bottom of the push rod 56. The outer wall of the needle valve 57 is fixedly connected to the heat insulation member 11. The top outer wall of the push rod 56 is slidably connected to the top shell 51. The pressure assembly 7 includes a bottom spring seat 71 fixedly connected to the top of the push rod 56. The pressure assembly 7 also includes a top spring seat 72 slidably connected to the top of the top shell 51. A first spring 73 is fixedly connected between the bottom spring seat 71 and the top spring seat 72.

[0034] By adopting the above technical solution, the detachable connection between the top shell 51 and the bottom shell 52 includes but is not limited to snap connection. When in use, the fuel pump 10 is started to facilitate the diesel in the fuel tank 1 to enter the interior of the low-pressure fuel pipe 2, and the impurities and moisture contained in the diesel are filtered by the fuel filter, so as to ensure that the diesel entering the injector 5 has a high purity and prevent the impurities and moisture from affecting the service life of the injector 5. Then, the diesel enters the interior of the fuel injection pump 3 through the low-pressure fuel pipe 2, enters the interior of the high-pressure fuel pipe 4 through the fuel injection pump 3, and then enters the interior of the fuel injector 5 to enter the injector. The diesel inside the device 5 enters the pressure chamber 54 through the oil inlet passage 55, until the pressure in the pressure chamber 54 reaches a level sufficient to push the push rod 56 upward, the push rod 56 moves upward with the bottom spring seat 71, and the needle valve 57 moves upward with it, so that the bottom of the needle valve 57 does not block the bottom spray hole of the nozzle 58. At this time, due to the high pressure of the diesel in the pressure chamber 54, the diesel can be sprayed out from the bottom spray hole of the nozzle 58 and enter the combustion chamber, thereby realizing the supply of fuel. It should be noted that when the push rod 56 moves upward with the bottom spring seat 71, the first spring 73 is in a compressed state.

[0035] It should be noted that the bottom of the nozzle 58 is tilted, and its position near the spray hole is equivalent to a valve seat, and the pressure chamber 54 is arranged at the injection seat 53 near the nozzle 58. When no oil is sprayed, the heat insulation member 11 is inside the nozzle 58, which can play a role in insulating the nozzle 58, thereby preventing the heat in the burner from being transferred from the spray hole to the inside of the injector 5, avoiding high temperature inside the injector 5, thereby avoiding damage to the sealing part, and thus avoiding affecting the service life of the injector 5.

[0036] When fuel injection is performed, as the top rod 56 moves upward with the bottom spring seat 71 and the needle valve 57, the heat insulation 11 moves upward accordingly into the interior of the pressure chamber 54, preventing the heat insulation 11 from affecting the fuel injection path, thereby reducing interference with the fuel injection and further avoiding affecting the fuel injection effect.

[0037] Specifically, Figures 2 to 7As shown, the heat insulating member 11 is high temperature resistant heat insulating cotton, the interior of the needle valve 57 is hollow, and the internal bottom end of the needle valve 57 is also provided with a heat insulating member 11 to further ensure the heat preservation effect, and an anti-blocking component 8 is provided below the push rod 56, and the anti-blocking component 8 includes empty grooves opened on both sides of the needle valve 57, and the interior of the empty groove is fixedly connected with a corrugated sheet 81, and the anti-blocking component 8 also includes a folding plate 82 fixedly connected to the bottom of the heat insulating member 11, and a plurality of folding plates 82 are provided, and a rotating frame 83 is provided on the side where the plurality of folding plates 82 are close to each other, and a lifting rod 12 is fixedly connected to the top of the rotating frame 83, and a power component 9 is provided above the lifting rod 12, and the power component 9 includes a first chamber 91 opened inside the bottom spring seat 71, and a first piston 92 is provided inside the first chamber 91, The outer wall of the first piston 92 fits the inner wall of the first chamber 91, and a small rod 93 is fixedly connected to the top of the first piston 92. A fixed block 94 is fixedly connected to the interior of the top shell 51 above the small rod 93. The power assembly 9 also includes a second chamber 95 opened at the top end of the lifting rod 12, and a second piston 96 is arranged inside the second chamber 95. The bottom of the second piston 96 is fixedly connected to the lifting rod 12, and the outer wall of the second piston 96 fits the inner wall of the second chamber 95. A medium channel 97 is arranged between the second chamber 95 and the first chamber 91. The medium channel 97 is divided into two sections, one of which is opened inside the bottom spring seat 71, and the other section is opened inside the top rod 56. The two sections of the medium channel 97 are connected to each other, and a liquid medium is arranged between the second piston 96 and the first piston 92.

[0038] By adopting the above technical solution, when injecting oil, as the top rod 56 moves upward with the bottom spring seat 71 and the needle valve 57, the small rod 93 moves upward accordingly. At this time, under the limiting action of the fixed block 94, the first piston 92 moves downward, thereby generating negative pressure above the first piston 92. Since the second chamber 95 is connected to the first chamber 91 through the medium channel 97, the second chamber 95 is located above the second piston 96 and generates negative pressure. Under the action of the negative pressure, the second piston 96 moves upward, thereby allowing the lifting rod 12 to move upward, thereby allowing the rotating frame 83 to move upward, thereby allowing the retracting plate 82 to move upward, thereby allowing the heat insulation member 11 to move upward, thereby accelerating the speed at which the heat insulation member 11 moves upward, so that when injecting oil, the heat insulation member 11 can move upward faster into the interior of the pressure chamber 54, further reducing the situation where the heat insulation member 11 affects the oil injection path, thereby further reducing the interference of the heat insulation member 11 on the oil injection, thereby avoiding affecting the oil injection effect.

[0039] It should be noted that the corrugated sheet 81 is made of a relatively hard metal material to prevent the corrugated sheet 81 from shifting inward when the internal pressure of the pressure chamber 54 is high and affecting the pressure of the injection oil. The corrugated design allows the folding plate 82 to move in the up and down directions, and as the rotating frame 83 moves upward, the folding plate 82 can be slightly rotated downward, which can play the role of folding the thermal insulation member 11, further reducing the influence of the thermal insulation member 11 on the injection oil path, thereby further reducing the interference of the thermal insulation member 11 on the injection oil, and thus avoiding affecting the injection oil effect.

[0040] The heat insulating member 11 is made of high temperature resistant heat insulating cotton and is covered with a high temperature resistant and soft material to prevent diesel from soaking the high temperature resistant heat insulating cotton and affecting the heat insulating effect.

[0041] When the oil injection is completed, the top rod 56 moves downward with the bottom spring seat 71 and the needle valve 57 under the elastic force of the first spring 73, and the small rod 93 moves downward accordingly. Under the elastic force of the corrugated sheet 81 itself, the lifting rod 12 can be reset, thereby resetting the first piston 92 and the second piston 96, and returning the heat insulation member 11 to the inside of the nozzle 58, thereby playing a role in heat insulation. A U-shaped elastic sheet can be installed inside the second chamber 95 to prevent the first piston 92 and the second piston 96 from being difficult to reset due to insufficient elastic force of the corrugated sheet 81 itself.

[0042] Specifically, Figure 3 , Figure 5 and Figure 6 As shown, a ventilation pipe 98 is fixedly connected to the second chamber 95 and the left side of the bottom of the first chamber 91 , and the diameter of the first chamber 91 is greater than the diameter of the second chamber 95 .

[0043] By adopting the above technical solution, the ventilation duct 98 runs through the left side of the top shell 51, ensuring that the first piston 92 and the second piston 96 can move smoothly, and the diameter of the first chamber 91 is larger than the diameter of the second chamber 95, ensuring that when the push rod 56 moves upward, the lifting rod 12 can move a greater distance, and the lifting rod 12 moves faster than the push rod 56, so that the insulation 11 can move upward into the interior of the pressure chamber 54 more quickly, thereby further reducing the interference of the insulation 11 on the injection, thereby avoiding affecting the injection effect.

[0044] Specifically, Figures 3 to 7 As shown, a bent frame 84 is fixedly connected to the inner wall of the needle valve 57 and above the corrugated sheet 81, a round rod 85 is rotatably connected to the rotating frame 83 near the gathering plate 82, an outer wall of the round rod 85 is fixedly connected to the gathering plate 82, a torsion spring 86 is fixedly connected between the round rod 85 and the rotating frame 83, and a first rotating shaft 87 is rotatably connected to the bottom of the bent frame 84.

[0045] By adopting the above technical solution, the design of the rotatable connection between the round rod 85 and the rotating frame 83 allows the folding plate 82 to rotate. When spraying oil, as the folding plate 82 moves upward with the thermal insulation 11, under the limiting action of the bent frame 84, the folding plate 82 is offset and rotated toward the lower end, further playing the role of folding the thermal insulation 11, further reducing the influence of the thermal insulation 11 on the oil injection path, thereby further reducing the interference of the thermal insulation 11 on the oil injection, and then avoiding affecting the oil injection effect. Under the action of the first rotating shaft 87, the friction between the folding plate 82 and the bent frame 84 is reduced.

[0046] It should be noted that the bent frame 84 is located above the folding plate 82 to ensure that the thermal insulation 11 is folded downward. When the oil injection stops, the folding plate 82 moves downward with the thermal insulation 11. At this time, the lifting rod 12 is reset, thereby resetting the first piston 92 and the second piston 96. Under the elastic force of the torsion spring 86, the folding plate 82 is reset to allow the thermal insulation 11 to expand.

[0047] Specifically, Figure 3 and Figure 8 As shown, a pressure sensor 13 is fixedly installed inside the top shell 51 near the oil inlet passage 55, the top of the top spring seat 72 is tilted, and a compensation component 6 is arranged on the top of the top shell 51, and the compensation component 6 includes a cylinder 61 fixedly connected to both sides of the top shell 51, and a third piston 62 is arranged inside the cylinder 61, and a moving rod 63 is fixedly connected to the side of the third piston 62 close to the top spring seat 72, and the side of the moving rod 63 away from the third piston 62 passes through the cylinder 61 and is fixedly connected to an extrusion frame 64, and the side of the cylinder 61 away from the extrusion frame 64 is fixedly plugged with an entry pipe 66, the bottom of the extrusion frame 64 is tilted, and a second rotating shaft 65 is rotatably connected to the inclined bottom of the extrusion frame 64.

[0048] By adopting the above technical solution, the second rotating shaft 65 is conducive to reducing the friction between the extrusion frame 64 and the top spring seat 72. Since the oil inlet 55 is connected to the pressure chamber 54, the pressure at the oil inlet 55 and the pressure chamber 54 are kept consistent. The pressure sensor 13 is used to detect the pressure at the oil inlet 55. It can detect the pressure in the oil inlet 55 at the moment when the push rod 56 moves, so as to judge the pressure during oil injection. When the injector 5 is used for a long time, the elastic force of the first spring 73 will be insufficient, resulting in insufficient pressure for oil injection. When it is found that the pressure for oil injection is insufficient, hydraulic oil is injected into the inlet pipe 66 through an external injection device, so that the third piston 62 moves in the cylinder 61. At this time, the moving rod 63 moves with the extrusion frame 64. Under the action of the inclined setting of the top of the top spring seat 72, it is convenient for the top spring seat 72 to move downward, thereby increasing the elastic force provided by the first spring 73 to the bottom spring seat 71, which plays an effect of compensating for the oil injection pressure, thereby ensuring the effect of oil injection at the nozzle 58.

[0049] Working principle: the fuel pump 10 is started, so that the diesel in the fuel tank 1 can enter the low-pressure fuel pipe 2, and the fuel filter can filter the impurities and water in the diesel. Then the diesel can enter the fuel injection pump 3 through the low-pressure fuel pipe 2, and then enter the high-pressure fuel pipe 4 through the fuel injection pump 3, and then enter the fuel injector 5. The diesel entering the fuel injector 5 enters the pressure chamber 54 through the oil inlet passage 55, until the pressure in the pressure chamber 54 reaches a level sufficient to push the push rod 56 upward. The push rod 56 moves upward with the bottom spring seat 71, and the needle valve 57 moves upward, so that the bottom of the needle valve 57 does not block the bottom spray hole of the nozzle 58. At this time, due to the high pressure of the diesel in the pressure chamber 54, the diesel can be sprayed out from the bottom spray hole of the nozzle 58 and When entering the combustion chamber, the bottom of the nozzle 58 is tilted, and its position near the spray hole is equivalent to a valve seat, and the pressure chamber 54 is arranged at the injection seat 53 near the nozzle 58. When no fuel is sprayed, the heat insulation 11 is inside the nozzle 58, which can play a role in heat insulation at the nozzle 58, thereby preventing the heat in the burner from being transferred from the spray hole to the inside of the injector 5, avoiding high temperature inside the injector 5, thereby avoiding damage to the sealing part, and thus avoiding affecting the service life of the injector 5. The push rod 56 moves upward with the bottom spring seat 71 and the needle valve 57, and the heat insulation 11 moves upward accordingly into the pressure chamber 54, avoiding the heat insulation 11 from affecting the injection path, thereby reducing interference with the injection, and thus avoiding affecting the injection effect.

[0050] As the push rod 56 moves upward with the bottom spring seat 71 and the needle valve 57, the lifting rod 12 can be moved upward, so that the rotating frame 83 moves upward, and then the retracting plate 82 moves upward, so that the heat insulation member 11 moves upward, which can speed up the upward movement of the heat insulation member 11, so that the heat insulation member 11 can move upward into the interior of the pressure chamber 54 more quickly during oil injection, further reducing the situation where the heat insulation member 11 affects the oil injection path. The diameter of the first chamber 91 is greater than the diameter of the second chamber 95, ensuring that the push rod 56 moves upward. When moving upward, the lifting rod 12 can move a greater distance, and the speed of the lifting rod 12 is faster than that of the push rod 56, so that the thermal insulation 11 can move upward faster and enter the interior of the pressure chamber 54, further reducing the interference of the thermal insulation 11 on the oil injection, thereby avoiding affecting the oil injection effect. Under the limiting action of the bent frame 84, the folding plate 82 is offset and rotated toward the lower end, further playing the role of folding the thermal insulation 11, further reducing the influence of the thermal insulation 11 on the oil injection path, thereby further reducing the interference of the thermal insulation 11 on the oil injection.

[0051] When it is found that the pressure of the injection oil is insufficient, hydraulic oil is injected into the inlet pipe 66 through an external injection and pressure device, so that the third piston 62 moves. At this time, the moving rod 63 moves with the extrusion frame 64. Under the action of the inclined setting of the top of the top spring seat 72, the top spring seat 72 is easy to move downward, thereby increasing the elastic force provided by the first spring 73 on the bottom spring seat 71, which has the effect of compensating the injection oil pressure, thereby ensuring the effect of injection oil at the nozzle 58.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel supply assembly for a diesel engine, comprising a fuel tank (1), characterized in that: A low-pressure oil pipe (2) is fixedly connected to the top of the oil tank (1); a fuel injection pump (3) is fixedly connected to the end of the low-pressure oil pipe (2) away from the oil tank (1); a high-pressure oil pipe (4) is fixedly connected to the top of the fuel injection pump (3); a fuel injector (5) is arranged at the end of the high-pressure oil pipe (4) away from the fuel injection pump (3); a fuel delivery pump (10) is fixedly connected to the right side of the fuel injection pump (3); and the output end of the fuel delivery pump (10) is inserted into the interior of the low-pressure oil pipe (2); The fuel injector (5) comprises a top shell (51) fixedly plugged into a side of a high-pressure fuel pipe (4) away from a fuel injection pump (3); the outer bottom of the top shell (51) is detachably connected to a bottom shell (52); the interior of the bottom shell (52) is fixedly connected to a fuel injection seat (53); the bottom of the fuel injection seat (53) is fixedly connected to a nozzle (58); a pressure chamber (54) is provided inside the fuel injection seat (53); the interiors of the fuel injection seat (53) and the top shell (51) are both provided with a fuel inlet passage (55); a pressure assembly (7) is provided inside the top shell (51) above the fuel inlet passage (55); The inside of the fuel injection seat (53) is slidably connected to a push rod (56), the bottom of the push rod (56) is fixedly connected to a needle valve (57), and the outer wall of the needle valve (57) is fixedly connected to a heat insulating member (11).

2. A fuel supply assembly for a diesel engine according to claim 1, characterized in that: The two oil inlet passages (55) are connected to the pressure chamber (54), and the top outer wall of the push rod (56) is slidably connected to the top shell (51).

3. A fuel supply assembly for a diesel engine according to claim 1, characterized in that: The pressure assembly (7) comprises a bottom spring seat (71) fixedly connected to the top of the top rod (56), and the pressure assembly (7) further comprises a top spring seat (72) slidably connected to the inside of the top end of the top shell (51), and a first spring (73) is fixedly connected between the bottom spring seat (71) and the top spring seat (72).

4. A fuel supply assembly for a diesel engine according to claim 3, characterized in that: The heat insulating member (11) is made of high temperature resistant heat insulating cotton. The interior of the needle valve (57) is designed to be hollow. A blocking component (8) is arranged below the push rod (56). The blocking component (8) includes empty grooves opened on both sides of the needle valve (57). A corrugated sheet (81) is fixedly connected to the interior of the empty groove. The blocking component (8) also includes a folding plate (82) fixedly connected to the bottom of the heat insulating member (11). There are multiple folding plates (82). A rotating frame (83) is arranged on the side where the multiple folding plates (82) are close to each other. The top of the rotating frame (83) is fixedly connected to a lifting rod (12).

5. A fuel supply assembly for a diesel engine according to claim 4, characterized in that: A power assembly (9) is arranged above the lifting rod (12), and the power assembly (9) includes a first chamber (91) opened inside the bottom spring seat (71), a first piston (92) is arranged inside the first chamber (91), a small rod (93) is fixedly connected to the top of the first piston (92), and a fixed block (94) is fixedly connected to the top of the small rod (93) inside the top shell (51), and the power assembly (9) also includes a second chamber (95) opened at the top end of the lifting rod (12), a second piston (96) is arranged inside the second chamber (95), and the bottom of the second piston (96) is fixedly connected to the lifting rod (12), and a medium channel (97) is arranged between the second chamber (95) and the first chamber (91).

6. A fuel supply assembly for a diesel engine according to claim 5, characterized in that: The second chamber (95) and the left side of the bottom of the first chamber (91) are both fixedly connected with a ventilation pipe (98).

7. A fuel supply assembly for a diesel engine according to claim 5, characterized in that: The diameter of the first chamber (91) is greater than the diameter of the second chamber (95).

8. A fuel supply assembly for a diesel engine according to claim 7, characterized in that: A bent frame (84) is fixedly connected to the inner wall of the needle valve (57) and above the corrugated sheet (81); a round rod (85) is rotatably connected to the rotating frame (83) near the folding plate (82); an outer wall of the round rod (85) is fixedly connected to the folding plate (82); a torsion spring (86) is fixedly connected between the round rod (85) and the rotating frame (83); and a first rotating shaft (87) is rotatably connected to the bottom of the bent frame (84).

9. A fuel supply assembly for a diesel engine according to claim 8, characterized in that: A pressure sensor (13) is fixedly installed inside the top shell (51) near the oil inlet passage (55); the top of the top spring seat (72) is inclined; a compensation component (6) is arranged on the top of the top shell (51); the compensation component (6) comprises a cylinder (61) fixedly connected to both sides of the top shell (51); a third piston (62) is arranged inside the cylinder (61); a moving rod (63) is fixedly connected to a side of the third piston (62) near the top spring seat (72); a side of the moving rod (63) away from the third piston (62) passes through the cylinder (61) and is fixedly connected to an extrusion frame (64); and a side of the cylinder (61) away from the extrusion frame (64) is fixedly plugged with an inlet pipe (66).

10. A fuel supply assembly for a diesel engine according to claim 9, characterized in that: The bottom of the extrusion frame (64) is arranged to be inclined, and a second rotating shaft (65) is rotatably connected to the inclined portion of the bottom of the extrusion frame (64).

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