Fuel oil distributor and fuel oil distribution method

Abstract

The invention discloses a fuel oil distributor and a fuel oil distribution method. The problems that in the prior art, a fuel oil distributor cannot meet the requirement for engine graded oil supply, and leakage is likely to happen are solved. The fuel oil distributor comprises a valve body, a valve element assembly is arranged in the valve body, and a pre-fuel oil path and a main fuel oil path are formed in the valve body; the valve element assembly comprises a pre-combustion valve element assembly, a main combustion valve element assembly and an oil drainage valve element assembly, the pre-combustion valve element assembly is provided with a first channel corresponding to the main fuel oil way and the main combustion valve element assembly, and the valve body is provided with a second channel corresponding to the pre-combustion oil way and the pre-combustion valve element assembly. And the oil discharge valve core assembly corresponds to the oil discharge port of the valve body. According to the fuel oil distributor, the requirements of high opening pressure, graded opening, small flow resistance, equal multi-path pressure difference and small leakage amount are met, the service life of the distributor and an engine is prolonged, the working efficiency is improved, and environmental pollution caused by fuel oil waste and insufficient combustion is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of turboshaft engine accessories, in particular to a fuel distributor. Background Art

[0002] The fuel distributor can provide the engine with fuel flow when it is working under different working conditions. When the engine is starting or slowing down, generally only a small amount of fuel is needed. If too much fuel is provided at this time, not only will the engine burn richly, but also environmental pollution will be caused due to incomplete combustion. When the engine is accelerating and in a high thrust state, generally more fuel is needed to meet the operating requirements. The traditional fuel distributor valve structure is mainly a sliding valve matching seal. Due to the inevitable gap between the sliding valve core and the valve sleeve, fuel leakage will occur, especially under high temperature conditions. For example, a turboshaft engine fuel distributor disclosed in the Chinese patent with publication number CN204729204U. In addition, the traditional fuel distributor cannot have both high opening pressure and staged opening, and cannot meet the engine's staged fuel supply needs. Summary of the invention

[0003] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a fuel distributor and a fuel distribution method, which solve the problems in the prior art that the fuel distributor cannot meet the requirements of engine graded fuel supply and is prone to leakage.

[0004] The technical solution of the present invention is implemented as follows: a fuel distributor includes a valve body, a valve core assembly is arranged in the valve body, a pre-fuel path and a main fuel path are opened on the valve body; the valve core assembly includes a pre-combustion valve core assembly, a main combustion valve core assembly and an oil drain valve core assembly, the pre-combustion valve core assembly is opened with a first channel corresponding to the main combustion valve path and the main combustion valve core assembly, and the valve body is opened with a second channel corresponding to the pre-combustion fuel path and the pre-combustion valve core assembly; the oil drain valve core assembly corresponds to the oil drain port of the valve body.

[0005] When pre-combustion is in progress, the pre-combustion valve core assembly is opened, and the second passage connects the oil inlet of the valve body with the pre-combustion fuel path. At this time, the main combustion valve core assembly and the oil drain valve core assembly are closed.

[0006] When the main combustion is in progress, the pre-combustion valve core assembly is opened, and the second channel connects the valve body oil inlet with the pre-combustion fuel line; the main combustion valve core assembly is opened, and the first channel connects the valve body oil inlet with the main fuel line, and the oil drain valve core assembly is closed.

[0007] When draining oil, the pre-combustion valve core assembly and the main combustion valve core assembly are closed, the drain valve core assembly is opened, and the oil in the valve body flows out through the oil drain port of the valve body.

[0008] Further preferably, the valve core assembly and the oil inlet and oil outlet of the valve body are located on the same axis; the oil inlet of the valve body is connected to an oil inlet joint, and the oil outlet is connected to an oil outlet joint; a conversion joint is provided on the pre-fuel line, a main fuel line is provided with a main fuel pipe joint, and throttling orifice plates are provided at the pre-fuel line outlet and the main fuel line outlet; the second channel is a stepped hole, the small-diameter inlet end of the stepped hole faces the pre-combustion valve core assembly, and the large-diameter outlet end of the stepped hole is connected to the pre-fuel line.

[0009] Further preferably, the pre-combustion valve core assembly includes a large valve core, a stepped cavity is opened in the large valve core, a main combustion valve core assembly is arranged in the small diameter cavity of the stepped cavity, a valve sleeve is arranged in the large diameter cavity of the stepped cavity, and the oil drain valve core assembly is limited in the valve sleeve and matched with the oil outlet joint; a circulation channel and an inclined first channel are opened on the large valve core, the first channel is a stepped hole, the small diameter inlet end of the stepped hole is connected with the small diameter cavity of the stepped cavity, and the large diameter outlet end of the stepped hole is connected with the circulation channel.

[0010] Further preferably, a first vulcanized rubber ring is provided on the end face of the large valve core facing the oil inlet joint, an oil drainage slot is provided axially on the outer wall of the large valve core, and the oil drainage slot is connected to the circulation channel; a first sealing member is provided between the large valve core and the valve body; and a second sealing member is provided between the valve sleeve and the large valve core.

[0011] Further preferably, the main combustion valve core assembly includes a small valve core, an inwardly concave retaining ring is provided at one end of the valve sleeve facing the small valve core, a first spring is provided between the retaining ring and the small valve core, and a third sealing member is provided between the small valve core and the large valve core.

[0012] Further preferably, an axial hole is formed at one end of the small valve core facing the oil inlet joint, a small hole is formed at the bottom of the retaining ring, and the retaining ring is fixedly and sealingly connected to the valve sleeve.

[0013] Further preferably, the oil drain valve core assembly includes an oil drain valve core, a second spring is provided between the oil drain valve core and the retaining ring, and the second spring is located in the valve sleeve; a fourth sealing member is provided between the oil drain valve core and the valve sleeve.

[0014] Further preferably, the oil drain valve core is a convex valve core, the oil drain valve core is limited in the valve sleeve by a baffle, the small diameter end of the oil drain valve core extends out of the baffle, and a third spring is provided between the baffle and the oil outlet connector, and the third spring sleeve is arranged on the oil drain valve core.

[0015] Further preferably, a second vulcanized rubber ring is provided on the end face of the oil drain valve core facing the oil outlet joint, and a three-step through hole is axially opened in the oil drain valve core, the smallest diameter hole of the three-step holes faces the oil outlet joint, and the largest diameter hole faces the retaining ring; the baffle is fixed to the end of the valve sleeve by a fastening screw.

[0016] A fuel distribution method for a fuel distributor, when the medium pressure entering the oil inlet joint reaches the pre-combustion opening pressure, the pre-combustion valve core assembly starts to move, at this time, the large valve core moves toward the oil outlet joint, and when the second channel is connected to the oil inlet of the valve body, the pre-combustion fuel path is opened; at the same time, the oil discharge valve core assembly contacts the oil outlet joint, closes the oil discharge port, and the pre-combustion fuel path starts to supply oil; when the medium pressure continues to rise to the main combustion opening pressure, the main combustion valve core assembly starts to move, at this time, the small valve core moves toward the oil outlet joint, and when the first channel is connected to the oil inlet of the valve body, the main fuel path is opened, and the main fuel path and the pre-combustion fuel path are supplied with oil at the same time; when the medium pressure drops to a certain value, the main combustion valve core assembly and the pre-combustion valve core assembly are reset in turn, and the small valve core and the large valve core move toward the oil inlet joint in turn, closing the main fuel path and the pre-combustion fuel path inlet, and stopping the oil supply; at this time, the oil discharge valve core of the oil discharge valve core assembly is separated from the oil outlet joint, the oil discharge port is opened, and the fuel in the fuel main pipe and the fuel in the valve are discharged through the oil discharge port.

[0017] The beneficial effects of the present invention are as follows: the fuel distributor of the present invention is a fuel distributor with high opening pressure, low flow resistance and equal pressure difference. The small valve core of the valve core assembly is sleeved in the middle cavity of the large valve core, and a corresponding spring is arranged inside. The spring and the inlet and outlet pressure chambers are completely isolated, so the spring is not affected by the opening and closing of the valve. Different opening pressures can be set according to the fuel supply demand of the engine and the capacity of the fuel pump, thereby forming a graded opening function with the pre-combustion valve to meet the demand for graded fuel supply of the engine; in addition, in order to ensure that the oil discharge port is closed when the large valve core is opened, the stiffness of the first spring behind the small valve core is designed to be very small, and the area of ​​the pre-combustion valve subjected to hydraulic pressure before opening is small, while the area subjected to pressure after opening is large, thereby ensuring that the fuel distributor is well sealed before the pre-combustion fuel path is opened, the oil discharge port discharges oil smoothly, and the purpose of rapid full opening and rapid closing of the oil discharge port can be achieved after opening; since the back pressure chamber of the main combustion valve is isolated from the main combustion outlet, the flow resistance after the main combustion valve is opened is also very small and is not affected by the opening pressure; the above-mentioned low flow resistance structural design further improves the performance and service life of the distributor.

[0018] The pre-combustion valve core and the main combustion valve core of the fuel distributor adopt various reliable sealing structures such as vulcanized rubber sealing valves, porous channel structures plus multiple seals, and combined sealing structures, which can achieve zero fuel leakage within the operating temperature range (-55℃~120℃), avoiding the problem of engine ignition failure or nozzle oil-rich carbonization caused by leakage. By setting throttling orifices at the outlets of the pre-combustion valve and the main combustion valve, equal pressure difference control of the two routes can be achieved, improving the control accuracy.

[0019] The fuel distributor has achieved the requirements of high opening pressure, staged opening, small flow resistance, equal pressure difference in multiple paths, and small leakage, which extends the service life of the distributor and the engine, improves work efficiency, and reduces fuel waste and environmental pollution caused by incomplete combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the internal structure of the fuel distributor of the present invention; Figure 2 It is a schematic diagram of the internal structure of the valve core assembly of the present invention; Figure 3 This is a schematic diagram of the large valve core structure of the present invention; Figure 4 This is a schematic diagram of another structure of the fuel distributor in Example 2; Figure 5 This is a schematic diagram of the external structure of the fuel distributor in Example 2.

[0022] In the figure: 1, oil outlet joint, 2, main fuel pipe joint, 3, screw, 4, valve core assembly, 41, pre-combustion valve core assembly, 4101, large valve core, 4102, valve sleeve, 4103, first vulcanized rubber ring, 4104, first sealing member, 4105, second sealing member, 42, main combustion valve core assembly, 4201, small valve core, 4202, retaining ring, 4203, first spring, 4204, third sealing member, 4205, axial hole, 43, drain valve core assembly, 43 01. Oil drain valve core, 4302. Second spring, 4303. Fourth seal, 4304. Baffle, 4305. Third spring, 4306. Second vulcanized rubber ring, 4307. Fastening screw, 5. Valve body, 6. Enter the oil inlet joint, 7. Seal, 8. Conversion joint, 9. Bolt, 10 Sleeve, 11. Pre-fuel path, 12. Main fuel path, 17. First channel, 18. Second channel, 19. Circulation channel, 20. Oil drain slit, 21. Protective cap. DETAILED DESCRIPTION

[0023] 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.

[0024] Embodiment 1, as Figure 1As shown, a fuel distributor includes a valve body 5, in which a valve core assembly 4 is arranged. The valve core assembly adopts a two-stage opening structure, which can have a high opening pressure and can be opened in stages; the valve body 5 is provided with a pre-fuel path 11 and a main fuel path 12; the valve core assembly 4 cooperates with the valve body to realize the opening and closing of the pre-fuel path or the pre-fuel path and the main fuel path, and reasonably distributes the fuel. The fuel distributor divides the main fuel into two opening states, the pre-fuel path and the main fuel path, according to the different opening pressures, and after the work is completed, the remaining fuel in the fuel main pipe flows back to the fuel tank or the distributor to avoid carbon deposition in the engine nozzle; the structure of the fuel distributor can fully meet the use requirements of the engine operation.

[0025] In this embodiment, the valve core assembly 4 includes a pre-combustion valve core assembly 41, a main combustion valve core assembly 42 and an oil drain valve core assembly 43. The pre-combustion valve core assembly 41 is provided with a first channel 17 corresponding to the main fuel oil path and the main combustion valve core assembly 42, and the valve body 5 is provided with a second channel 18 corresponding to the pre-combustion fuel oil path and the pre-combustion valve core assembly 41; the oil drain valve core assembly 43 corresponds to the oil drain port of the valve body 5. The pre-combustion valve core assembly 41 controls the opening and closing of the pre-combustion fuel oil path, the main combustion valve core assembly 42 controls the opening and closing of the main fuel oil path, and the oil drain valve core assembly 43 controls the opening and closing of the oil drain port. The three cooperate and link to distribute and control the fuel to the pre-combustion nozzle and the main fuel nozzle of the engine according to the fuel pressure, and discharge the remaining fuel and oil gas in the distributor cavity when the engine is started and stopped.

[0026] Specifically: when pre-combustion is performed, the pre-combustion valve core assembly 41 is opened, and the second channel 18 connects the oil inlet of the valve body 5 with the pre-combustion fuel path. At this time, the oil entering from the oil inlet of the valve body 5 enters the pre-combustion fuel path through the second channel; the main combustion valve core assembly 42 and the oil drain valve core assembly 43 are both in a closed state, and the engine performs pre-combustion.

[0027] When the main combustion is in progress, the pre-combustion valve core assembly 41 is opened, and the second channel 18 connects the oil inlet of the valve body 5 with the pre-combustion fuel path; the main combustion valve core assembly 42 is opened, and the first channel 17 connects the oil inlet of the valve body 5 with the main fuel path, and the drain valve core assembly 43 is closed; the pre-combustion and the main fuel path work simultaneously, and the engine performs the main combustion. When the engine is stopped and the oil is to be drained, the pre-combustion valve core assembly 41 and the main combustion valve core assembly 42 are closed, and the drain valve core assembly 43 is opened, and the oil in the valve body flows out through the drain port of the valve body 5.

[0028] Embodiment 2, as Figure 4 , 5As shown, a fuel distributor, based on Example 1, the valve core assembly 4 in this embodiment is located on the same axis as the oil inlet and oil outlet of the valve body 5, which reduces flow resistance and thus reduces leakage. In this embodiment, the oil inlet of the valve body 5 is connected to an oil inlet joint 6, and the oil outlet is connected to an oil outlet joint 1; a protective cap 21 is provided on the oil inlet joint and the oil outlet joint; the oil inlet joint and the oil outlet joint are respectively connected to the valve body by screws 3, and a sealing member 7 is provided between the valve body to ensure the overall sealing. In this embodiment, a conversion joint 8 is provided on the pre-fuel line, and the conversion joint is connected to a sleeve 10 through a bolt member 9, and the sleeve 10 is connected to the corresponding pre-combustion pipe. A main fuel pipe joint 2 is provided on the main fuel line; it should be noted that one or more main fuel lines can be provided; in this embodiment, three are taken as an example, and corresponding three main fuel pipe joints are provided, and three first channels 17 are provided; one pre-fuel line is provided, one corresponding conversion joint 8 is provided, and one second channel 18 is provided. The second channel 18 is a stepped hole, which adopts two stepped holes, that is, the small-diameter inlet end of the stepped hole faces the pre-combustion valve core assembly 41, and the large-diameter outlet end of the stepped hole is connected to the pre-fuel oil path; a throttling orifice plate can be provided at the outlet of the pre-fuel oil path to cooperate with the stepped hole to adjust the outlet pressure of the pre-fuel oil path to ensure that the pressure difference of the two paths is basically equal (the difference is not greater than 0.05MPa); and the spring chambers of the pre-combustion valve core assembly and the main combustion valve core assembly are isolated from the outlet, thereby realizing equal pressure difference control of the two paths and improving control accuracy.

[0029] like Figure 2 , 3 As shown, the pre-combustion valve core assembly 41 described in this embodiment includes a large valve core 4101, which is located in the cavity of the valve body. A stepped cavity is provided in the large valve core 4101. The stepped cavity adopts two stepped cavities, that is, a main combustion valve core assembly 42 is provided in the small diameter cavity of the stepped cavity, and the main combustion valve core assembly and the pre-combustion valve core assembly form a two-stage opening structure. A valve sleeve 4102 is provided in the large diameter cavity of the stepped cavity, and the valve sleeve can move relative to the large valve core. The oil discharge valve core assembly 43 is limited in the valve sleeve 4102 and matches the oil outlet joint 1; the oil discharge valve core assembly 43 contacts and seals with the oil outlet joint 1 to close the oil discharge port; the oil discharge valve core assembly 43 is separated from the oil outlet joint 1 to open the oil discharge port. A circulation channel 19 and an inclined first channel 17 are provided on the large valve core 4101. The circulation channel adopts an annular groove. The outlet ends of the three first channels are all connected to the circulation channel for the flow of fuel to the main fuel path. In this embodiment, the first channel 17 is a stepped hole, which is a two-step hole, that is, the small-diameter inlet end of the stepped hole is connected to the small-diameter cavity of the stepped cavity, and the large-diameter outlet end of the stepped hole is connected to the circulation channel 19. A throttling orifice plate can be provided at the outlet of the main fuel line to adjust the outlet pressure of the main fuel line to ensure that the pressure difference of the two lines is basically equal (the difference is not greater than 0.05MPa).

[0030] In this embodiment, the large valve core 4101 is provided with a first vulcanized rubber ring 4103 on its end surface facing the oil inlet connector 6; an oil drain slit 20 is provided axially on the outer wall of the large valve core 4101, and the oil drain slit 20 is connected to the circulation channel 19; when the engine is stopped, the excess oil in the valve flows to the oil drain port through the oil drain slit 20 for oil discharge. A first seal 4104 is provided between the large valve core 4101 and the valve body 5, and the first seal 4104 can adopt a seal ring plus a seal ring structure to improve the sealing performance; a second seal 4105 is provided between the valve sleeve 4102 and the large valve core 4101; similarly, the second seal can also adopt a seal ring plus a seal ring structure to improve the sealing performance.

[0031] In this embodiment, the main combustion valve core assembly 42 comprises a small valve core 4201, which is sleeved in the large valve core. The valve sleeve 4102 is provided with an inwardly concave retaining ring 4202 at one end facing the small valve core 4201, and a first spring 4203 is provided between the retaining ring 4202 and the small valve core 4201. The first spring 4203 is completely isolated from the inlet and outlet pressure chambers. A third sealing member 4204 is provided between the small valve core 4201 and the large valve core 4101, and the third sealing member can be a sealing ring, which ensures the movement of the valve core while ensuring the sealing performance. The small valve core 4201 is provided with an axial hole 4205 at one end facing the oil inlet connector 6, which is used to buffer the impact and fluctuation of the oil inlet entering the valve core. A small hole is provided at the bottom of the retaining ring 4202, and the small hole is designed to allow excess oil to flow to the oil drain port. The retaining ring 4202 is fixedly sealed and connected to the valve sleeve 4102; ensure that the first spring and the second spring are completely isolated from the inlet and outlet pressure chambers, so the first spring and the second spring are not affected by the opening and closing of the valve, and the interior of the valve is not affected by the pressure, and the opening pressure is only related to the spring force and the friction force of the valve; the size of the spring force is designed according to the opening pressure, so different opening pressures can be set according to the fuel supply demand of the engine and the capacity of the fuel pump. The opening pressure of the valve can be set very large or very small, and a very high opening pressure can be achieved, thereby forming a graded opening function with the pre-combustion valve to meet the engine's graded fuel supply needs.

[0032] The oil drain valve core assembly 43 in this embodiment includes an oil drain valve core 4301, a second spring 4302 is provided between the oil drain valve core 4301 and the retaining ring 4202, and the second spring 4302 is located in the valve sleeve 4102, in a relatively sealed environment, and is isolated from the inlet and outlet pressures to avoid being affected by the opening and closing of the valve. A fourth sealing member 4303 is provided between the oil drain valve core 4301 and the valve sleeve 4102; the fourth sealing member can be a sealing ring to improve the sealing between the valve sleeve and the oil drain valve core. The oil drain valve core 4301 is a convex-shaped valve core, and the large diameter portion of the oil drain valve core 4301 is limited in the valve sleeve 4102 by the baffle plate 4304, and the small diameter end of the oil drain valve core 4301 extends out of the baffle plate 4304, and a third spring 4305 is provided between the baffle plate 4304 and the oil outlet connector 1, and the third spring 4305 is sleeved on the oil drain valve core 4301; the third spring 4305 cooperates with the first and second springs to control the left and right movement of the oil drain valve core to realize the opening and closing of the oil drain port. In order to ensure that the oil outlet is closed when the pre-combustion valve (large valve core) is opened, the first spring behind the pre-combustion valve (small valve core) is designed with a very small stiffness, and the area under hydraulic pressure before the pre-combustion valve is opened is small, while the area under pressure after opening is large, thereby ensuring that the fuel distributor is well sealed before the pre-combustion fuel line is opened, and the oil outlet is drained smoothly, and can be quickly fully opened and quickly closed after opening; because the back pressure chamber of the main combustion valve is isolated from the main combustion outlet, the flow resistance after the main combustion valve is opened is also very small and is not affected by the opening pressure. The above low flow resistance structural design further improves the performance and service life of the distributor.

[0033] Preferably, the oil drain valve core 4301 in this embodiment is provided with a second vulcanized rubber ring 4306 on the end surface facing the oil outlet connector 1, and a three-step through hole is opened in the axial direction in the oil drain valve core 4301, with the smallest diameter hole of the three-step hole facing the oil outlet connector 1 and the largest diameter hole facing the retaining ring 4202, for the discharge of oil; the baffle 4304 is fixed to the end of the valve sleeve 4102 by a fastening screw 4307 to limit the oil drain valve core 4301. The pre-combustion valve and the main combustion valve of the fuel distributor are both made of vulcanized rubber sealing valves, porous channel structure + O-ring, combined sealing structure and other reliable sealing structures, which can achieve zero fuel leakage within the working temperature range (-55℃~120℃), avoiding the problem of engine ignition failure or nozzle oil-rich carbonization due to leakage.

[0034] The valve core of the fuel distributor adopts a two-stage opening structure. When starting, the fuel working fluid first pushes the large valve core to move to the specified position. At this time, the left end of the oil discharge valve core completes the sealing of the oil discharge joint and connects to the pre-fuel path through the second channel. As the pressure increases, the small valve core will move to the specified position to open the main fuel path. The main fuel path is connected to the oil inlet through the internal small valve core hole channel and the external large valve core oblique hole channel. When the main fuel path is opened, the pre-fuel path remains open.

[0035] Embodiment 3: A fuel distribution method for a fuel distributor as described in Embodiment 2, when the medium pressure entering the oil inlet joint 6 reaches the pre-combustion opening pressure, the pre-combustion valve core assembly 41 starts to move, at this time, the large valve core 4101 moves toward the oil outlet joint 1, and when the second channel 18 is connected to the oil inlet of the valve body 5, the pre-combustion fuel path is opened; at the same time, the oil discharge valve core assembly 43 contacts the oil outlet joint 1, closes the oil discharge port, and the pre-combustion fuel path starts to supply fuel. In other words, when the medium pressure of the fuel distributor is low, the two valve cores are kept in place under the action of their respective spring forces, at this time, the entire cavity is sealed by the seal to ensure that there is no leakage, after the fuel working medium pressure reaches the specified parameter, the external large valve core of the valve core assembly 4 first moves to the left to the specified position, at this time the left end oil discharge joint is sealed by the oil discharge valve core, and the pre-combustion fuel path is connected to the inlet on the oil inlet joint 1 through the second channel; a throttling orifice plate can be installed in the pre-combustion fuel pipe of the pre-combustion fuel path, and the control of the flow rate and pressure difference of the pre-combustion fuel path can be completed by adjusting the inner diameter of the throttling orifice plate.

[0036] When the medium pressure continues to rise to the main fuel opening pressure, the main fuel valve core assembly 42 starts to move. At this time, the small valve core 4201 moves toward the oil outlet joint 1. When the first channel 17 is connected to the oil inlet of the valve body 5, the main fuel path is opened, and the main fuel path and the pre-fuel path supply oil at the same time. That is to say, as the working medium pressure continues to increase, the large valve core is pushed to the left end limit position and no longer moves. The small valve core begins to move to the left to the specified position. At this time, the main fuel path is opened, completing the system's oil supply to the fuel main pipe. When the main fuel path is connected, the pre-fuel path remains open.

[0037] When the medium pressure drops to a certain value, for example, when the vehicle is stopped, the main combustion valve core assembly 42 and the pre-combustion valve core assembly 41 are reset in sequence, and the small valve core 4201 and the large valve core 4101 move toward the oil inlet connector 6 in sequence, closing the main fuel line and the pre-combustion line inlet, and stopping the oil supply; at this time, the oil drain valve core 4301 of the oil drain valve core assembly 43 is detached from the oil outlet connector 1, the oil drain port is opened, and the fuel in the fuel main pipe and the fuel in the valve are discharged through the oil drain port.

[0038] When used, the fuel distributor is installed in front of the engine fuel main pipe, distributes and controls the fuel to the engine pre-ignition nozzle and main fuel nozzle according to the fuel pressure, and discharges the remaining fuel and oil gas in the distributor cavity when the engine is started and stopped. The fuel distributor has achieved the requirements of high opening pressure, staged opening, small flow resistance, equal pressure difference in multiple channels, and small leakage, which extends the service life of the distributor and the engine, improves work efficiency, and reduces fuel waste and environmental pollution caused by incomplete combustion.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel distributor, comprising a valve body (5), characterized in that: A valve core assembly (4) is provided in the valve body (5), and a pre-fuel path (11) and a main fuel path (12) are provided on the valve body (5); The valve core assembly (4) comprises a pre-combustion valve core assembly (41), a main combustion valve core assembly (42) and an oil discharge valve core assembly (43); the pre-combustion valve core assembly (41) is provided with a first passage (17) corresponding to the main combustion oil path and the main combustion valve core assembly (42); the valve body (5) is provided with a second passage (18) corresponding to the pre-combustion oil path and the pre-combustion valve core assembly (41); the oil discharge valve core assembly (43) corresponds to the oil discharge port of the valve body (5); When the pre-combustion operation is performed, the pre-combustion valve core assembly (41) is opened, and the second passage (18) is connected to the oil inlet of the valve body (5) and the pre-combustion oil path. At this time, the main combustion valve core assembly (42) and the oil drain valve core assembly (43) are closed; When the main combustion operation is performed, the pre-combustion valve core assembly (41) is opened, and the second channel (18) is connected to the oil inlet of the valve body (5) and the pre-combustion fuel path; the main combustion valve core assembly (42) is opened, and the first channel (17) is connected to the oil inlet of the valve body (5) and the main fuel path, and the oil discharge valve core assembly (43) is closed; When the oil is discharged, the pre-combustion valve core assembly (41) and the main combustion valve core assembly (42) are closed, the oil discharge valve core assembly (43) is opened, and the oil in the valve body flows out through the oil discharge port of the valve body (5).

2. The fuel distributor according to claim 1, characterized in that: The oil inlet and the oil outlet of the valve core assembly (4) and the valve body (5) are located on the same axis; the oil inlet of the valve body (5) is connected to an oil inlet joint (6), and the oil outlet is connected to an oil outlet joint (1); a conversion joint (8) is provided on the pre-fuel line, and a main fuel line is provided with a main fuel pipe joint (2); a throttling orifice plate is provided at the outlet of the pre-fuel line and the outlet of the main fuel line; the second channel (18) is a stepped hole, the small-diameter inlet end of the stepped hole faces the pre-combustion valve core assembly (41), and the large-diameter outlet end of the stepped hole is connected to the pre-fuel line.

3. The fuel distributor according to claim 2, characterized in that: The pre-combustion valve core assembly (41) comprises a large valve core (4101), a stepped cavity is provided in the large valve core (4101), a main combustion valve core assembly (42) is provided in the small diameter cavity of the stepped cavity, a valve sleeve (4102) is provided in the large diameter cavity of the stepped cavity, and the oil discharge valve core assembly (43) is limited in the valve sleeve (4102) and matches the oil outlet joint (1); a circulation channel (19) and an inclined first channel (17) are provided on the large valve core (4101), the first channel (17) is a stepped hole, the small diameter inlet end of the stepped hole is connected to the small diameter cavity of the stepped cavity, and the large diameter outlet end of the stepped hole is connected to the circulation channel (19).

4. The fuel distributor according to claim 3, characterized in that: A first vulcanized rubber ring (4103) is provided on the end surface of the large valve core (4101) facing the oil inlet joint (6); an oil drainage slit (20) is provided on the outer wall of the large valve core (4101) along the axial direction, and the oil drainage slit (20) is connected to the circulation channel (19); a first sealing member (4104) is provided between the large valve core (4101) and the valve body (5); and a second sealing member (4105) is provided between the valve sleeve (4102) and the large valve core (4101).

5. The fuel distributor according to claim 3 or 4, characterized in that: The main combustion valve core assembly (42) comprises a small valve core (4201); an inwardly concave retaining ring (4202) is provided at one end of the valve sleeve (4102) facing the small valve core (4201); a first spring (4203) is provided between the retaining ring (4202) and the small valve core (4201); and a third sealing member (4204) is provided between the small valve core (4201) and the large valve core (4101).

6. The fuel distributor according to claim 5, characterized in that: An axial hole (4205) is formed at one end of the small valve core (4201) facing the oil inlet joint (6), a small hole is formed at the bottom of the retaining ring (4202), and the retaining ring (4202) is fixedly and sealingly connected to the valve sleeve (4102).

7. The fuel distributor according to claim 6, characterized in that: The oil drain valve core assembly (43) comprises an oil drain valve core (4301), a second spring (4302) is provided between the oil drain valve core (4301) and the retaining ring (4202), and the second spring (4302) is located in the valve sleeve (4102); and a fourth sealing member (4303) is provided between the oil drain valve core (4301) and the valve sleeve (4102).

8. The fuel distributor according to claim 7, characterized in that: The oil discharge valve core (4301) is a convex-shaped valve core. The oil discharge valve core (4301) is limited in position in the valve sleeve (4102) by a baffle plate (4304). The small-diameter end of the oil discharge valve core (4301) extends out of the baffle plate (4304). A third spring (4305) is provided between the baffle plate (4304) and the oil outlet joint (1). The third spring (4305) is sleeved on the oil discharge valve core (4301).

9. The fuel distributor according to claim 7 or 8, characterized in that: A second vulcanized rubber ring (4306) is provided on the end surface of the oil discharge valve core (4301) facing the oil outlet joint (1); a three-step through hole is axially opened in the oil discharge valve core (4301); the smallest diameter hole of the three-step holes faces the oil outlet joint (1), and the largest diameter hole faces the retaining ring (4202); and the retaining plate (4304) is fixed to the end of the valve sleeve (4102) by means of a fastening screw (4307).

10. A fuel dispensing method for a fuel dispenser according to any one of claims 1 to 9, characterized in that: When the pressure of the medium entering the oil inlet joint (6) reaches the pre-combustion opening pressure, the pre-combustion valve core assembly (41) starts to move. At this time, the large valve core (4101) moves toward the oil outlet joint (1). When the second channel (18) is connected to the oil inlet of the valve body (5), the pre-combustion fuel path is opened. At the same time, the oil discharge valve core assembly (43) contacts the oil outlet joint (1), closing the oil discharge port, and the pre-combustion fuel path starts to supply fuel. When the medium pressure continues to rise to the main fuel opening pressure, the main fuel valve core assembly (42) starts to move. At this time, the small valve core (4201) moves toward the oil outlet joint (1). When the first channel (17) is connected to the oil inlet of the valve body (5), the main fuel path is opened, and the main fuel path and the pre-fuel path are supplied with oil at the same time. When the medium pressure drops to a certain value, the main combustion valve core assembly (42) and the pre-combustion valve core assembly (41) are reset in sequence, and the small valve core (4201) and the large valve core (4101) are moved in sequence toward the oil inlet joint (6), closing the inlet of the main fuel oil path and the pre-combustion fuel oil path, and stopping the oil supply; at this time, the oil discharge valve core (4301) of the oil discharge valve core assembly (43) is separated from the oil outlet joint (1), the oil discharge port is opened, and the fuel in the fuel main pipe and the fuel in the valve are discharged through the oil discharge port.

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