Oil filling pipe assembly for supplying oil to fuel injector

Abstract

The invention relates to the field of fuel oil supply systems of internal combustion engines, and discloses an oil filler pipe assembly for fuel oil supply of a fuel oil injector, which comprises an oil conveying mechanism, the oil conveying mechanism comprises a filter shell, two oil inlets and an oil outlet are formed in the left end of the filter shell, and a filtering mechanism is connected in the filter shell; the filter mechanism is arranged in the filter shell and comprises a short connecting pipe, the left end of the short connecting pipe is fixedly communicated with the oil outlet, the right end of the short connecting pipe is connected with a filter unit, and the short connecting pipe and the oil outlet are jointly connected with a non-return unit; the oil filler pipe assembly for supplying oil to the fuel injector can effectively solve the technical problems that in the prior art, when an automobile with diesel oil as fuel is started in winter, due to the fact that a filter element in a filter cannot filter normally due to the fact that the viscosity of the diesel oil is increased, a bypass valve is opened every time the automobile is started at low temperature, impurities in the diesel oil are introduced into the fuel injector, and the fuel injector cannot filter normally. And the abrasion of the fuel injector is aggravated.

Description

[0001] The invention relates to the field of fuel supply systems for internal combustion engines, and in particular to an oil filling pipe assembly for supplying oil to a fuel injector. Background Art

[0002] The fuel injection pipe assembly for automobile fuel injectors is a key component in the internal combustion engine fuel supply system. It is mainly used to transfer fuel from the fuel pump to each fuel injector. The fuel injection pipe assembly for fuel injectors includes a fuel tank, a filter, a fuel distribution pipe and an oil pipe connecting the three. The fuel is stored in the fuel tank. When working, the fuel pump first pumps the oil from the oil pipe to the filter, and the oil is filtered through the filter to remove impurities. The filtered oil is then transported along the oil pipe to the fuel distribution pipe, and finally transported to the fuel injector by the fuel distribution pipe.

[0003] The filter is mainly composed of four parts: the shell, the filter element, the bypass valve and the check valve. When working, the filter element is used to absorb impurities in the oil. When the filter element is blocked and the pressure is high, the bypass valve automatically opens to allow unfiltered fuel to pass through to prevent the engine from being damaged due to complete blockage of the oil circuit. However, impurities in the unfiltered oil will also enter the fuel injector, causing wear of its internal components and thus reducing its service life.

[0004] When some diesel-fueled cars are started in winter, when the temperature is high and the viscosity of the diesel is normal, the filter element can filter the oil normally even if there are some impurities attached to it. However, if the temperature is low, the viscosity of the diesel will increase significantly and the fluidity will become worse. In this case, the resistance encountered by the diesel when passing through the filter element increases. In this case, the pressure difference on both sides of the filter element is large, which will cause the bypass valve to open every time the car is cold started. In this case, if the filter is replaced in time, the service life of the filter will be reduced. If it is not discovered in time, the probability of introducing impurities into the fuel injector will increase, aggravating its wear. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an oil filling pipe assembly for supplying fuel to a fuel injector, which can effectively solve the problem in the prior art that when a diesel-fueled car is started in winter, the filter element in the filter cannot filter normally due to the increased viscosity of the diesel, resulting in the bypass valve opening every time the car is cold-started at low temperature, introducing impurities in the diesel into the fuel sprayer, and aggravating the wear of the fuel injector.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A fuel injection pipe assembly for supplying fuel to a fuel injector, comprising:

[0008] The oil delivery mechanism includes a filter housing, and the left end of the filter housing is provided with two oil inlets and an oil outlet, the oil inlet is detachably connected to an external oil tank through a No. 1 oil delivery pipe, and the oil outlet is detachably connected to an external fuel distribution pipe through a No. 2 oil delivery pipe.

[0009] The filtering mechanism is arranged inside the filter housing, and the filtering mechanism includes a short connecting pipe, the left end of the short connecting pipe is fixedly connected to the oil outlet, the right end of the short connecting pipe is connected to a filtering unit for removing impurities in the fuel, and the short connecting pipe and the oil outlet are commonly connected to a check unit.

[0010] Wherein, the filter unit includes a central filter tube, both ends of the central filter tube are fixedly connected with mounting plates, the centers of the two mounting plates are rotatably connected with rotary seats, a bypass component is commonly connected between the two rotary seats, and an annular connecting seat is also rotatably connected to the rotary seat, the annular connecting seat is fixedly connected to the inner surface of the circumference of the filter housing through a connecting piece, and a separation component for filtering impurities in the oil is commonly connected to the two annular connecting seats.

[0011] Furthermore, the bypass assembly includes an opening and closing seat, which is a funnel-shaped cavity structure with an opening at the right end. The right-side cylindrical section of the opening and closing seat is fixedly connected to the left end of the right-side mounting plate. A piston No. 1 that cooperates with the right-side rotating seat is also slidably connected in the right-side cylindrical section of the opening and closing seat. The No. 1 piston and the opening and closing seat are fixedly connected by a No. 1 spring. A center rod passes through and is fixedly connected to the No. 1 piston. Both ends of the center rod are located in the rotating seat and are both connected to a rotating module. A plurality of slots are provided on the circumferential outer surface of the left-side cylindrical section of the opening and closing seat along the circumferential direction.

[0012] Furthermore, the rotating module includes a cylindrical groove wheel, which is fixedly connected to the rotating seat through a connecting frame, and the cylindrical groove wheel is rotatably sleeved on the center rod. The inner wall of the cylindrical groove wheel is provided with a corrugated groove, and the side wall of the center rod is fixedly connected with a contact block that matches the corrugated groove.

[0013] Furthermore, the separation component includes an arc-shaped isolating member, which is fixedly connected between two annular seats. The two straight sections of the arc-shaped isolating member are both made of elastic rubber material. A folded filter paper is arranged on the outside of the central filter tube. The two ends of the folded filter paper are abutted against the two annular seats. The folded filter paper has a plurality of wavy folds, each fold includes a convex portion and a concave portion. Both ends of the folded filter paper are connected to an expansion module, and a pushing module that cooperates with the expansion module is connected to the rotating seat.

[0014] Furthermore, the unfolding module includes a bone rod, which is fixedly connected to the recessed part of the folded filter paper. The end face of the mounting plate away from the filter element is fixedly connected to a ring track, and a plurality of sliding parts corresponding to the bone rod are slidably connected to the ring track. The sliding parts are rotatably connected to the bone rod, and a V-shaped spring piece is commonly connected between two adjacent sliding parts.

[0015] Furthermore, the pushing module includes a center gear, which is fixedly mounted on a rotating seat. Two driven gears are meshed on the center gear. The two driven gears are rotatably connected to the mounting plate, and the positions of the two driven gears correspond to the positions of the two straight line segments of the arc-shaped isolation member. A cam is fixedly connected to the driven gear, and the cam cooperates with the sliding member.

[0016] Furthermore, the check unit includes a partition, which is fixedly mounted on the short connecting pipe and fixedly connected to the circumferential inner surface of the filter housing. A plurality of oil passages are evenly penetrated through the left end face of the partition in the circumferential direction, and the oil passages are all connected to opening and closing components, two of which correspond to the oil inlets and are commonly connected to the corresponding oil inlets with a tightening component.

[0017] Furthermore, the opening and closing assembly includes a No. 2 piston, the left end of which is fixedly connected to a round rod, an annular plate is fixedly sleeved on the round rod, the annular plate and the partition are connected by a No. 2 spring, a limit seat matching the annular plate is fixedly connected to the partition, and the annular plate and the limit seat are slidably connected.

[0018] Furthermore, the tightening assembly includes an extension rod, which is fixedly connected to the left end of the round rod corresponding to the oil inlet, and a push block is fixedly connected to the left end of the extension rod. An annular sealing gasket is abutted at the connection between the No. 1 oil pipe and the oil inlet, and the inner diameter of the through hole in the annular sealing gasket gradually decreases from left to right. An annular clamping block is fixedly connected to the extension rod through a connecting frame, and the outer diameter of the annular clamping block gradually increases from left to right.

[0019] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] The folding design of the foldable filter paper of the present invention can effectively increase the actual effective area of ​​the filter paper, thereby extending its service life. At the same time, one part of the folds of the foldable filter paper is located outside the arc-shaped isolation piece to filter impurities in the fuel, while the other part of the folds are located inside the arc-shaped isolation piece in a relatively clean state. When the folds located outside the arc-shaped isolation piece cause the No. 1 piston to open due to changes in fuel concentration or excessive attachment of impurities, during the movement of the No. 1 piston, the clean folds in the arc-shaped isolation piece will be driven to move out of the arc-shaped isolation piece through the expansion and closing module and the pushing module, and at the same time, the folds with residual impurities will be driven to enter the arc-shaped isolation piece and fold, thereby achieving the effect of automatically replacing the operating part of the foldable filter paper. While extending the service life of the foldable filter paper, the frequency of movement of the No. 2 piston caused by temperature changes can also be reduced, thereby reducing the amount of fuel that directly enters the central filter tube without being filtered, thereby reducing damage to the fuel injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of an oil filling pipe assembly for supplying oil to a fuel injector according to the present invention;

[0023] Figure 2 A schematic diagram of the three-dimensional structure of a filter housing, a filter unit and a check unit in an oil filling pipe assembly for supplying oil to a fuel injector according to the present invention;

[0024] Figure 3 A three-dimensional cross-sectional view of a filter housing, a filter unit and a check unit in an oil filling pipe assembly for supplying oil to a fuel injector according to the present invention;

[0025] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A;

[0026] Figure 5 A schematic diagram of the three-dimensional structure of a separation component in an oil filling pipe assembly for supplying oil to a fuel injector according to the present invention;

[0027] Figure 6 A three-dimensional structural schematic diagram of a filter unit and a check unit in a fuel injection pipe assembly for supplying fuel to a fuel injector according to the present invention;

[0028] Figure 7 A schematic diagram of the three-dimensional structure of a bypass component in an oil filling pipe assembly for supplying oil to a fuel injector according to the present invention;

[0029] Figure 8 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0030] Fig. 9 For the present invention Figure 3 A partial enlarged view of point C in the middle.

[0031] The numbers in the figure represent: 1. filter housing; 11. oil inlet; 12. oil outlet; 2. No. 1 oil pipeline; 3. No. 2 oil pipeline; 4. short connecting pipe; 5. filter unit; 51. center filter tube; 52. mounting plate; 53. rotary seat; 54. bypass assembly; 541. opening and closing seat; 542. No. 1 piston; 543. No. 1 spring; 544. center rod; 545. rotary module; 5451. cylindrical groove wheel; 5452. corrugated groove; 5453. contact block; 55. annular connecting seat; 56. separation assembly; 561. arc-shaped spacer; 562, folded filter paper; 563, unfolding module; 5631, bone rod; 5632, sliding part; 5633, V-shaped spring; 564, pushing module; 5641, central gear; 5642, driven gear; 5643, cam; 6, check unit; 61, partition; 62, opening and closing assembly; 621, No. 2 piston; 622, round rod; 623, annular sheet; 624, No. 2 spring; 625, limit seat; 63, tightening assembly; 631, extension rod; 632, push block; 633, annular sealing gasket; 634, annular tight block. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 making creative work are within the scope of protection of the present invention.

[0033] The present invention will be further described below in conjunction with the embodiments.

[0034] Example:

[0035] See also Figure 1 - Fig. 9 , a fuel injection pipe assembly for supplying fuel to a fuel injector, comprising:

[0036] The oil delivery mechanism includes a filter housing 1, and the left end of the filter housing 1 is provided with two oil inlets 11 and an oil outlet 12, the oil inlet 11 is detachably connected to the external fuel tank through a No. 1 oil delivery pipe 2, and the oil outlet 12 is detachably connected to the external fuel distribution pipe through a No. 2 oil delivery pipe 3.

[0037] The filtering mechanism is arranged inside the filter housing 1, and the filtering mechanism includes a short connecting pipe 4, the left end of the short connecting pipe 4 is fixedly connected to the oil outlet 12, the right end of the short connecting pipe 4 is connected to a filtering unit 5 for removing impurities in the fuel, and the short connecting pipe 4 and the oil outlet 12 are commonly connected with a check unit 6.

[0038] The filter unit 5 comprises a central filter tube 51, both ends of which are fixedly connected with mounting plates 52, the centers of the two mounting plates 52 are rotatably connected with rotary seats 53, a bypass assembly 54 is commonly connected between the two rotary seats 53, the bypass assembly 54 is activated when the filter unit 5 is blocked to prevent the fuel in the fuel distribution pipe from being drained, an annular connecting seat 55 is also rotatably connected to the rotary seat 53, the annular connecting seat 55 is fixedly connected to the inner surface of the circumference of the filter housing 1 through a connecting piece, and a separation assembly 56 for filtering impurities in the oil is commonly connected to the two annular connecting seats 55.

[0039] In specific implementation, when it is necessary to deliver fuel to the fuel sprayer, the fuel in the fuel tank is pumped into the filter housing 1 along the No. 1 fuel pipe 2 and the fuel inlet 11 through an external fuel pump. The fuel entering therein is first filtered through the separation component 56 to remove impurities therein, and then enters the central filter tube 51, and finally enters the fuel distribution pipe along the central filter tube 51, the short connecting pipe 4 and the oil outlet 12.

[0040] The bypass assembly 54 includes an opening and closing seat 541, which is a funnel-shaped cavity structure with an opening at the right end. The right cylindrical section of the opening and closing seat 541 is fixedly connected to the left end of the right mounting plate 52. A No. 1 piston 542 that cooperates with the right rotating seat 53 is also slidably connected in the right cylindrical section of the opening and closing seat 541. The No. 1 piston 542 and the opening and closing seat 541 are fixedly connected by a No. 1 spring 543. A center rod 544 passes through and is fixedly connected to the No. 1 piston 542. Both ends of the center rod 544 are located in the rotating seat 53 and are both connected to a rotating module 545. The circumferential outer surface of the left cylindrical section of the opening and closing seat 541 is provided with a plurality of slots along the circumferential direction.

[0041] The rotating module 545 includes a cylindrical groove wheel 5451, which is fixedly connected to the rotating seat 53 through a connecting frame. The cylindrical groove wheel 5451 is rotatably sleeved on the center rod 544. The inner wall of the cylindrical groove wheel 5451 is provided with a corrugated groove 5452, and the side wall of the center rod 544 is fixedly connected with a contact block 5453 that matches the corrugated groove 5452.

[0042] The separation component 56 includes an arc-shaped isolation member 561, which is fixedly connected between two annular seats 55. The two straight sections of the arc-shaped isolation member 561 are both made of elastic rubber material. A folded filter paper 562 is arranged on the outside of the central filter tube 51. The two ends of the folded filter paper 562 abut against the two annular seats 55. The folded filter paper 562 has a plurality of wavy folds, each of which includes a convex portion and a concave portion. Both ends of the folded filter paper 562 are connected to an unfolding module 563, and the rotating seat 53 is connected to a pushing module 564 that cooperates with the unfolding module 563.

[0043] The unfolding module 563 includes a bone rod 5631, which is fixedly connected to the recessed part of the folded filter paper 562. The end face of the mounting plate 52 away from the filter element is fixedly connected with an annular track, and a plurality of sliding members 5632 corresponding to the bone rod 5631 are slidably connected to the annular track. The sliding members 5632 and the bone rod 5631 are rotatably connected, and a V-shaped spring piece 5633 is commonly connected between two adjacent sliding members 5632. The V-shaped spring piece 5633 is always in an elastically compressed state to ensure that the distances between the two elastic members located inside and outside the arc-shaped isolation member 561 are respectively equal, so that the folds of the folded filter paper 562 are evenly and fully unfolded within a certain limit, and the portion of the folded filter paper 562 located between the arc-shaped isolation members 561 has a smaller folding angle than the portion located outside the arc-shaped isolation member 561.

[0044] The pushing module 564 includes a center gear 5641, which is fixedly mounted on the rotating seat 53. Two driven gears 5642 are meshed on the center gear 5641. The two driven gears 5642 are rotatably connected to the mounting plate 52, and the positions of the two driven gears 5642 correspond to the positions of the two straight line segments of the arc-shaped isolation member 561. A cam 5643 is fixedly connected to the driven gear 5642, and the cam 5643 cooperates with the sliding member 5632.

[0045] The non-return unit 6 includes a partition 61, which is fixedly mounted on the short connecting pipe 4 and fixedly connected to the circumferential inner surface of the filter housing 1. A plurality of oil passages are evenly penetrated through the left end surface of the partition 61 along the circumferential direction, and each of the oil passages is connected to an opening and closing assembly 62, wherein two opening and closing assemblies 62 correspond to the oil inlet 11 and are commonly connected to a tightening assembly 63 with the corresponding oil inlet 11.

[0046] The opening and closing component 62 includes a No. 2 piston 621, the left end of which is fixedly connected to a round rod 622, and a ring plate 623 is fixedly sleeved on the round rod 622. The ring plate 623 and the partition 61 are connected through a No. 2 spring 624, and the No. 2 spring 624 is always in an elastic compression state. A limit seat 625 that cooperates with the ring plate 623 is fixedly connected to the partition 61, and the ring plate 623 and the limit seat 625 are slidingly connected.

[0047] The tightening assembly 63 includes an extension rod 631, which is fixedly connected to the left end of the round rod 622 corresponding to the oil inlet 11. The left end of the extension rod 631 is fixedly connected to a push block 632. An annular sealing gasket 633 is abutted at the connection between the No. 1 oil pipeline 2 and the oil inlet 11. The inner diameter of the through hole in the annular sealing gasket 633 gradually decreases from left to right. An annular clamping block 634 is fixedly connected to the extension rod 631 through a connecting frame, and the outer diameter of the annular clamping block 634 gradually increases from left to right.

[0048] During specific implementation, the fuel pump pumps the fuel in the fuel tank along the No. 1 oil pipe 2, the oil inlet 11 and the short connecting pipe 4 to the cavity area formed by the filter housing 1, the partition 61 and the short connecting pipe 4. With the continuous input of fuel, the hydraulic pressure in the cavity continues to increase, driving the No. 2 piston 621, the round rod 622 and the annular plate 623 to slide to the right synchronously, and a gap is generated between the No. 2 piston 621 and the oil passage. The fuel enters the cavity formed by the partition 61, the folded filter paper 562 and the filter housing 1 along the gap. Then the fuel in the cavity passes through the folded filter paper 562 into the central filter tube 51, and then enters the external fuel distributor along the short connecting pipe 4, the oil outlet 12 and the No. 2 oil pipe 3, so as to clean the fuel. In this state, the No. 1 piston 542 is always in contact with the cylindrical section on the right side of the opening and closing seat 541 under the action of the No. 1 spring 543 to close the opening and closing seat 541.

[0049] Part of the impurities filtered out above will remain on the folds of the folded filter paper 562 located on the outside of the arc-shaped isolation piece 561. The folds located inside the arc-shaped isolation piece 561 have a smaller fold angle than the fold angle outside, and the distance between the depressions and protrusions is larger than the distance between the depressions and protrusions of the folds located inside the arc-shaped isolation piece 561. Therefore, the protrusions will abut against the inner wall of the arc section of the arc-shaped isolation piece 561, and the folds of the folded filter paper 562 located inside the arc-shaped isolation piece 561 are in a relatively clean state.

[0050] The impurities remaining on the folds of the folded filter paper 562 on the outside of the arc-shaped isolation piece 561 will have a certain impact on the filtering effect of the folded filter paper 562 before accumulating to a certain amount. However, under normal temperature conditions, the folded filter paper 562 plays a normal filtering role. However, after the temperature drops to a certain level, the viscosity of some types of fuel (especially diesel) will increase significantly. During filtering, the impurities remaining on the surface of the folded filter paper 562 will increase the flow resistance of the fuel, thereby increasing the hydraulic pressure in the partition 61, the folded filter paper 562 and the filter housing 1, thereby further compressing the No. 1 spring 543, and the No. 1 piston 542 slides to the left to the conical section of the opening and closing seat 541. At this time, the fuel can directly enter the central filter tube 51 along the rotary seat 53 on the right.

[0051] When piston No. 1 542 moves to the left, it will drive the center rod 544 to move to the left synchronously, thereby driving the contact block 5453 to move to the left synchronously. The movement of the contact block 5453 to the left will drive the cylindrical groove wheel 5451 to rotate through the corrugated groove therein, thereby driving the center gear 5641 to rotate. The rotation of the center gear 5641 will drive the driven gear 5642 to rotate synchronously, and drive the cam 5643 to rotate synchronously. When the two cams 5643 rotate, they will contact the corresponding sliding members 5632. The rotation of one of the cams 5643 drives the sliding member 5632 on one side to disengage from the arc-shaped isolation member 561. In this process, the two straight sections of the arc-shaped isolation member 561 will be deformed, and the clean folds on the folded filter paper 562 can slide out of the arc-shaped isolation member 561. , the other cam 5643 rotates to drive the sliding member 5632 on the other side to slide into the arc-shaped isolation member 561, and then the folds of the folded filter paper 562 with impurities are folded and gathered into the arc-shaped isolation member 561. At the same time, since the folds of each folded filter paper 562 located in the arc-shaped isolation member 561 are relatively independent, the impurities that enter will not contaminate the clean folds of the folded filter paper 562 originally located therein. This process is repeated, and the folds of the folded filter paper 562 located in the arc-shaped isolation member 561 on the folded filter paper 562 can be automatically replaced. Since there are no impurities attached to the clean folds, the flow resistance is relatively small. Therefore, even if the fuel becomes viscous due to low temperature, it can normally pass through the folded filter paper 562 into the central filter tube 51, and the opening and closing seat 541 will not be opened subsequently.

[0052] The above-mentioned automatic pleat replacement process will also automatically occur when a certain amount of impurities accumulate on the outer pleats of the arc-shaped isolation member 561, causing the folded filter paper 562 to be unable to function normally, thereby reducing the frequency of opening of the No. 2 piston 621 and further improving the utilization rate and service life of the folded filter paper 562.

[0053] At the same time, when there are too many impurities in the above-mentioned folded filter paper 562 or the fuel becomes viscous due to low temperature, thereby increasing the resistance to fuel flow, the internal hydraulic pressure of the filter housing 1 will also increase, and the pressure at the No. 1 oil pipe 2 and the oil inlet 11 will also increase. Excessive hydraulic pressure may affect the sealing here, and thus a tightening assembly 63 is provided at the connection between the two. When the fuel enters the oil inlet 11 and pushes the No. 2 piston 621 to open, the annular clamping block 634 will be driven to move to the right through the round rod 622, the extension rod 631, the push block 632 and the connecting frame, and the annular sealing gasket 633 will be pressed against the connection between the No. 1 oil pipe 2 and the oil inlet 11, thereby enhancing the sealing of the connection.

[0054] It is worth noting that the above-mentioned fuel injector fuel supply oil filling pipe assembly has the following advantages:

[0055] Advantage 1. The folding design of the folded filter paper 562 can effectively increase the actual effective area of ​​the filter paper, thereby extending its service life. At the same time, one part of the folds of the folded filter paper 562 is located outside the arc-shaped isolation piece 561 to filter impurities in the fuel, while the other part of the folds are folded in the arc-shaped isolation piece 561 in a relatively clean state. When the folds outside the arc-shaped isolation piece 561 cause the No. 1 piston 542 to open due to changes in fuel concentration or excessive attachment of impurities, during the movement of the No. 1 piston 542, the clean folds in the arc-shaped isolation piece 561 will be driven to move out of the arc-shaped isolation piece 561 through the expansion module 563 and the pushing module 564, and at the same time, the folds with residual impurities will be driven to enter the arc-shaped isolation piece 561 and fold, thereby achieving the effect of automatically replacing the operating end of the folded filter paper 562. While extending the service life of the folded filter paper 562, it can also reduce the frequency of movement of the No. 2 piston 621 due to temperature changes, thereby reducing the amount of fuel that directly enters the central filter tube 51 without filtration, and reducing damage to the fuel injector.

[0056] Advantage 2: The folds of the folded filter paper 562 inside the arc-shaped isolating piece 561 have a smaller fold angle than the fold angle outside, and the distance between the depression and the protrusion is larger than the distance between the depression and the protrusion of the folds inside the arc-shaped isolating piece 561. Therefore, the protrusion will abut against the inner wall of the arc segment of the arc-shaped isolating piece 561. Under the action of the V-shaped spring piece 5633, the folds of the folded filter paper 562 inside the arc-shaped isolating piece 561 are fully and evenly expanded within a certain limit. The folds are relatively independent and thus relatively clean afterwards. Therefore, the impurities that enter will not contaminate the clean folds of the folded filter paper 562 originally located therein.

[0057] Advantage three: When the resistance to fuel flow increases due to excessive impurities in the folded filter paper 562 or the fuel becomes viscous due to low temperature, the internal hydraulic pressure of the filter housing 1 will also increase, and the pressure on the No. 1 oil pipe 2 and the oil inlet 11 will also increase. Therefore, a tightening assembly 63 is set at the connection between the two. When the fuel enters the oil inlet 11 and pushes the No. 2 piston 621 to open, the annular clamping block 634 will be driven to move to the right through the round rod 622, the extension rod 631, the push block 632 and the connecting frame, and the annular sealing gasket 633 will be pressed against the connection between the No. 1 oil pipe 2 and the oil inlet 11, thereby enhancing the sealing of the connection.

[0058] 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel injection pipe assembly for supplying fuel to a fuel injector, characterized in that: include: An oil delivery mechanism, the oil delivery mechanism comprising a filter housing (1), the left end of the filter housing (1) being provided with two oil inlets (11) and an oil outlet (12), the oil inlet (11) being detachably connected to an external oil tank via a No. 1 oil delivery pipe (2), and the oil outlet (12) being detachably connected to an external fuel distribution pipe via a No. 2 oil delivery pipe (3); A filter mechanism, the filter mechanism being arranged inside the filter housing (1), the filter mechanism comprising a short connecting pipe (4), the left end of the short connecting pipe (4) being fixedly connected to the oil outlet (12), the right end of the short connecting pipe (4) being connected to a filter unit (5) for removing impurities in the fuel, and the short connecting pipe (4) and the oil outlet (12) being commonly connected to a check unit (6); The filter unit (5) comprises a central filter tube (51), both ends of the central filter tube (51) are fixedly connected to mounting plates (52), the centers of the two mounting plates (52) are rotatably connected to rotary seats (53), a bypass component (54) is commonly connected between the two rotary seats (53), and an annular connecting seat (55) is also rotatably connected to the rotary seat (53), the annular connecting seat (55) is fixedly connected to the inner surface of the circumference of the filter housing (1) through a connecting piece, and a separation component (56) for filtering impurities in oil is commonly connected to the two annular connecting seats (55).

2. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 1, characterized in that: The bypass assembly (54) includes an opening and closing seat (541), which is a funnel-shaped cavity structure with an opening at the right end. The right cylindrical section of the opening and closing seat (541) is fixedly connected to the left end of the right mounting plate (52). A piston (542) that cooperates with the right rotating seat (53) is also slidably connected in the right cylindrical section of the opening and closing seat (541). The piston (542) and the opening and closing seat (541) are fixedly connected via a spring (543). A center rod (544) passes through and is fixedly connected to the piston (542). Both ends of the center rod (544) are located in the rotating seat (53) and are both connected to a rotating module (545). A plurality of notches are opened in the circumferential direction on the circumferential outer surface of the left cylindrical section of the opening and closing seat (541).

3. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 2, characterized in that: The rotating module (545) includes a cylindrical groove wheel (5451), which is fixedly connected to the rotating seat (53) through a connecting frame. The cylindrical groove wheel (5451) is rotatably sleeved on the center rod (544), and the inner wall of the cylindrical groove wheel (5451) is provided with a corrugated groove (5452). The side wall of the center rod (544) is fixedly connected with a contact block (5453) that matches the corrugated groove (5452).

4. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 1, characterized in that: The separation component (56) comprises an arc-shaped isolating member (561), the arc-shaped isolating member (561) is fixedly connected between two annular connecting seats (55), the two straight sections of the arc-shaped isolating member (561) are both made of elastic rubber material, a folded filter paper (562) is arranged outside the central filter tube (51), the two ends of the folded filter paper (562) are abutted against the two annular connecting seats (55), the folded filter paper (562) has a plurality of wavy folds, each fold comprises a convex portion and a concave portion, the two ends of the folded filter paper (562) are connected to an unfolding module (563), and the rotating seat (53) is connected to a pushing module (564) that cooperates with the unfolding module (563).

5. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 4, characterized in that: The unfolding module (563) comprises a bone rod (5631), wherein the bone rod (5631) is fixedly connected to the recessed portion of the folded filter paper (562), and an annular track is fixedly connected to the end surface of the mounting plate (52) away from the filter element, and a plurality of sliding members (5632) corresponding to the bone rod (5631) are slidably connected to the annular track, wherein the sliding members (5632) and the bone rod (5631) are rotationally connected, and a V-shaped spring sheet (5633) is commonly connected between two adjacent sliding members (5632).

6. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 5, characterized in that: The pushing module (564) includes a central gear (5641), which is fixedly mounted on a rotating seat (53). Two driven gears (5642) are meshed on the central gear (5641). The two driven gears (5642) are both rotatably connected to the mounting plate (52), and the positions of the two driven gears (5642) correspond to the positions of the two straight line segments of the arc-shaped isolation member (561). A cam (5643) is fixedly connected to the driven gear (5642), and the cam (5643) cooperates with the sliding member (5632).

7. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 1, characterized in that: The non-return unit (6) comprises a partition (61), the partition (61) being fixedly sleeved on the short connecting pipe (4), and the partition (61) being fixedly connected to the circumferential inner surface of the filter housing (1), and a plurality of oil passages being uniformly opened and penetrated along the circumferential direction on the left end surface of the partition (61), and each of the oil passages is connected to an opening and closing assembly (62), wherein two opening and closing assemblies (62) correspond to the oil inlet (11) and are connected to a tightening assembly (63) on the corresponding oil inlet (11).

8. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 7, characterized in that: The opening and closing assembly (62) includes a No. 2 piston (621), the left end of which is fixedly connected to a round rod (622), an annular plate (623) is fixedly sleeved on the round rod (622), the annular plate (623) and the partition (61) are connected via a No. 2 spring (624), a limiting seat (625) matched with the annular plate (623) is fixedly connected to the partition (61), and the annular plate (623) and the limiting seat (625) are slidably connected.

9. The fuel injection pipe assembly for supplying fuel to a fuel injector according to claim 8, characterized in that: The tightening assembly (63) comprises an extension rod (631), the extension rod (631) is fixedly connected to the left end of a round rod (622) corresponding to the oil inlet (11), the left end of the extension rod (631) is fixedly connected to a push block (632), a connection between the No. 1 oil delivery pipe (2) and the oil inlet (11) is abutted with an annular sealing gasket (633), the inner diameter of the through hole in the annular sealing gasket (633) gradually decreases from left to right, and an annular clamping block (634) is fixedly connected to the extension rod (631) via a connecting frame, and the outer diameter of the annular clamping block (634) gradually increases from left to right.

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