CN205779394U - Combination type piezoelectric fuel injection supercharging electromagnetism jet hybrid fuel jet device - Google Patents

Abstract

The purpose of this utility model is to provide a combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device, including a gas booster part, a piezoelectric-electromagnetic control part, a double-needle valve nozzle part and an injection device housing. The utility model adopts double-needle valve nozzles to inject two fuels, fuel oil and gas, which saves space and simplifies the engine structure. It uses electromagnetic valves to control gas injection, and piezoelectric control valves to control fuel injection. Working state and working sequence, the injection device can realize multiple working modes such as only injecting fuel or gas, simultaneous injection of two fuels, sequential injection of two fuels, etc. The engine can work in pure diesel mode or fuel pilot gas mode. The supercharged piston is used to supercharge the gas, and the gas injection process can be switched between supercharged and non-supercharged modes, and the gas injection pressure can be adjusted to meet the needs of the engine for mixing oil and gas under different working conditions.

Description

Combined Piezoelectric Fuel Injection-Boost Electromagnetic Jet Mixed Fuel Injection Device

technical field

The utility model relates to a fuel injection device, in particular to a dual-fuel engine fuel injection device.

Background technique

With the continuous consumption of fossil fuels and the increasingly stringent emission regulations of internal combustion engines, the use of alternative fuels is an effective means to simultaneously solve the problems of energy shortage and environmental pollution faced by engine development. Natural gas and petroleum gas have become the main substitute fuels for internal combustion engines due to their abundant resources, low price, and clean combustion.

At present, there are two main fuel supply methods for dual-fuel engines: one is to mix the gaseous fuel with the inhaled air before it is introduced into the engine cylinder, and then directly inject a certain amount of liquid fuel near the top dead center of the combustion chamber, thereby causing Burning gas fuel, this method is likely to cause engine knocking, and in addition, when the engine is under low load, the pre-mixed gas is too thin to be conducive to combustion. Another method is to inject the gas directly into the combustion chamber, and also use the pilot amount of liquid fuel to trigger the combustion of the gas fuel. This method will not cause the engine to deflagrate prematurely, and the fuel burns in the diffusion combustion mode, and the combustion effect is good. , but it also has certain problems: First, the structure of the modern engine cylinder head is complex and there are many parts, so it is difficult to arrange two injectors. In addition, if two injectors are installed to inject dual fuel, the original The diesel engine has undergone major changes, increasing the complexity of device processing and assembly. Second, in order to improve the mixing degree of oil and gas, a supercharging device is usually used to pressurize the gas to increase the gas injection pressure. Compared with liquid fuel, if the gas is boosted by a high-pressure pump, the transmission process from the pump end to the injection device will Pipeline structure, tightness and strength requirements are high. Fourth, the injection device has high requirements for gas sealing. With the movement of the needle valve, the gas leaks upward along the gap between the needle valve coupler, and the leaked gas enters the control chamber, resulting in a decrease in the gas injection pressure and injection rate, which seriously affects the working stability of the device.

Contents of the invention

The purpose of the utility model is to provide a combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device which can be switched between two modes of boosting or non-pressurizing during the injection process, and the injection law is flexible and variable.

The purpose of this utility model is achieved in that:

The utility model combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device is characterized in that it includes a gas booster part, an injection device body, a control valve sleeve, an inner cylinder of the injection device, a needle valve base, a fuel injection part, For the gas injection part, the control valve sleeve and the inner cylinder of the injection device are installed in the injection device body from top to bottom, the needle valve base is installed under the injection device body through the nozzle sleeve, and the needle valve base includes a fuel base and a gas base;

The booster part includes a booster solenoid valve, a booster piston, a booster piston sleeve, and an intake valve. The booster piston sleeve is installed above the injection device body. The booster solenoid valve includes a booster solenoid valve seat, a booster solenoid , booster armature, booster solenoid valve rod, the servo oil inlet port and servo oil drain port are set in the booster solenoid valve seat, one end of the booster solenoid valve rod is fixed on the booster armature through the booster stop ring, and the other One end runs through the seat of the booster solenoid valve and is pressed against the baffle under the action of the pretightening force of the booster solenoid valve spring on it. The position of the booster armature forms a booster armature cavity, and the position of the booster solenoid valve spring A booster solenoid valve spring chamber is formed, and an annular oil band is set on the booster solenoid valve rod, and the annular oil band realizes the connection or disconnection of the servo oil inlet port and the booster armature chamber and the servo oil discharge through the movement of the booster solenoid valve rod. The connection or disconnection between the oil port and the spring cavity of the booster solenoid valve; the booster piston is installed in the booster piston sleeve, and the booster piston sleeve is installed under the booster solenoid valve seat, and the upper end of the booster piston is connected with the booster piston sleeve and A servo oil cavity is formed between the booster electromagnetic valve seats, a booster chamber is formed between the lower end of the booster piston and the booster piston sleeve, and a booster piston spring is set on the booster piston; the intake valve is a one-way valve installed on In the booster piston sleeve, a gas inlet is arranged on the booster piston sleeve, the gas inlet is connected to the intake valve, and the outlet of the intake valve is connected to the booster chamber;

The fuel part includes a piezoelectric element, a changeover piston, a changeover piston spring seat, a control valve rod, a control valve seat, and a fuel needle valve. The bottom is installed in the inner cylinder of the injection device, the changing piston is located in the spring seat of the changing piston, the control valve stem under the changing piston is installed in the control valve seat, the upper end of the changing piston is stuck on the elastic gasket, and the elastic gasket is located in the piezoelectric Below the component, the change piston spring seat is covered with a change piston spring. The upper end of the change piston spring is stuck on the change piston spring seat, and its lower end is pressed against the control valve seat. The control valve oil chamber is formed between the control valve seat and the injection device body. , the fuel needle valve control chamber is formed between the fuel base and the injection device body, the fuel needle valve is installed in the fuel base, an oil tank is formed between the fuel needle valve and the fuel base, the control valve oil chamber and the fuel needle valve control chamber pass through the left oil The oil passage communicates with the right oil passage, the valve stem low-pressure oil ring is set on the control valve stem, the second low-pressure oil drain port and the high-pressure fuel inlet are arranged on the injection device body, the valve stem low-pressure oil ring is connected with the second low-pressure oil drain port, The control valve spring is sleeved on the bottom end of the control valve stem, the lower end of the control valve spring is supported on the injection device body, the fuel needle valve spring is sleeved on the upper end of the fuel needle valve, and the upper end of the fuel needle valve spring is supported on the injection device body , the oil tank is connected to the high-pressure fuel inlet through the fuel oil passage, and the fuel oil passage is connected to the fuel needle valve control chamber;

The gas injection part includes a control gas solenoid valve, a gas needle valve limit rod and a gas needle valve. The control gas solenoid valve includes a solenoid valve body, an electromagnet, an armature, an upper sealing base of the valve stem, a lower sealing base of the valve stem, Solenoid valve spring, solenoid valve stem, solenoid valve body are installed in the control valve sleeve, solenoid valve body, valve stem upper seal seat, valve stem lower seal seat and gas needle valve limit rod are arranged from top to bottom, solenoid valve body The electromagnetic valve cavity is formed between the upper sealing base of the valve stem and the upper sealing base of the valve stem and the lower sealing base of the valve stem. The electromagnet is installed in the electromagnetic valve cavity, and the armature is located under the electromagnet. One end of the solenoid valve is stuck on the armature through the stop ring, and the other end passes through the upper sealing base of the valve stem under the armature, and cooperates with the lower sealing base of the valve stem. The cone surface and the lower sealing cone surface matched with the lower sealing base of the valve stem, the part where the valve stem of the solenoid valve matches the upper sealing base of the valve stem forms a low-pressure oil ring belt, and the part where the valve stem of the solenoid valve matches the lower sealing base of the valve stem A high-pressure oil ring is formed, the first oil passage and the fourth oil passage are arranged on the upper sealing base of the valve stem, the second oil passage and the third oil passage are arranged on the lower sealing base of the valve stem, and the inner cylinder of the injection device is arranged to communicate with the high-pressure fuel inlet. The fifth oil passage in the injection device body is provided with the first low-pressure oil drain port, the first oil passage is connected to the solenoid valve chamber and the first low-pressure oil discharge port, the second oil passage is connected to the high-pressure oil ring belt and the fifth oil passage, and the gas The center oil passage is set in the needle valve limit rod, the third oil passage is connected to the groove cavity and the center oil passage, the fourth oil passage is connected to the low-pressure oil ring belt solenoid valve chamber, the gas needle valve is located under the gas needle valve limit rod, and the gas A sealing ring and a gas chamber are respectively formed between the needle valve and the gas base. The sealing ring is connected to the fifth oil passage, and the gas chamber is connected to the booster chamber in the booster piston sleeve through the inner cylinder of the injection device and the gas channel in the control valve sleeve. , the end of the gas base is provided with a gas injection hole.

The utility model can also include:

1. When the control gas solenoid valve is not energized, the solenoid valve stem is pressed on the sealing base under the valve stem under the action of the solenoid valve spring, the high-pressure oil ring is closed, and the low-pressure oil ring is opened; when the control gas solenoid valve is energized, the solenoid The valve stem lifts up and presses on the sealing base on the valve stem, the low-pressure oil ring is closed, and the high-pressure oil ring is opened.

2. When the piezoelectric element is energized, the control valve stem overcomes the force of the control valve spring, and the low-pressure oil ring of the valve stem opens; when the piezoelectric element is not energized, the control valve stem is pressed on the control valve seat under the action of the control valve spring, and the valve Rod low pressure oil ring is closed.

The utility model has the advantages that: the combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device of the utility model uses double needle valve nozzles to inject two kinds of fuel, which saves space and simplifies the engine structure. and a solenoid valve to control the injection process of fuel oil and gas respectively, taking into account the control accuracy and cost of the injection device. When only the piezoelectric control valve or the solenoid valve works alone, the injection device only injects one kind of fuel, the maximum lift of the needle valve controlled by the piezoelectric element is adjustable, and the injection law of the pilot fuel is adjustable; the solenoid valve and the piezoelectric control valve When working at the same time, the two fuels are injected at the same time; when the piezoelectric control valve and the solenoid valve work sequentially, the two fuels can be injected sequentially, and the injection device can work in pure diesel mode and fuel pilot gas mode, with high reliability. high. In addition, this device uses a booster piston to realize gas boosting, and the booster control is separated from the gas injection control, which not only can realize the arbitrary switching between booster and non-pressurization modes during the injection process, but also can control the gas booster regardless of the injection starting point. At the beginning moment, the injection pattern of "shoe shape" and "slow first and then fast" can be obtained, which can meet the requirements of the engine on the pilot fuel injection quantity and gas injection pressure under different working conditions.

At the same time, the device has the following beneficial effects: the device controls the oil drain circuit to flow through the upper part of the solenoid valve body, and the heat is taken away through the oil drain cycle to reduce the temperature of the solenoid valve part, ensuring the reliability and stability of the solenoid valve. A long sealing belt and a large oil chamber are used between the booster piston and the booster piston sleeve to prevent gas leakage and improve the stability of the gas injection device; a sealing ring is designed between the gas needle valve and the needle valve seat, and the introduction part The control oil is used as the sealing oil to seal the gas, which can effectively prevent gas leakage. At the same time, the control oil in the control chamber and the sealing oil in the sealing ring adopt the same oil, and the oil pressure is equal, which can effectively ensure that the control oil and sealing oil have no static leakage .

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2a is a schematic diagram of the gas booster part, Figure 2b is a schematic diagram of a booster solenoid valve, Figure 2c is a schematic diagram of a one-way valve, Figure 2d is a schematic diagram of a booster solenoid valve stem position 1, and Figure 2e is a booster solenoid valve stem position 2 schematic diagram;

Fig. 3a is a schematic diagram of piezoelectric-electromagnetic control part, Fig. 3b is a schematic diagram of electromagnetic control part, Fig. 3c is a schematic diagram of piezoelectric control part, Fig. 3d is a schematic diagram of solenoid valve stem position 1, and Fig. 3e is a schematic diagram of solenoid valve stem position 2;

Figure 4a is a schematic view of the nozzle part, Figure 4b is a schematic view of the gas base part, and Figure 4c is a schematic view of the fuel base part.

detailed description

The utility model is described in more detail below in conjunction with accompanying drawing example:

1 to 4, the combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present utility model is mainly composed of a gas booster part 1, a piezoelectric-electromagnetic control part 2, a double needle valve nozzle part 4 and an injection device body 7 composition. The gas booster part 1 mainly includes a booster solenoid valve 8, a booster piston 9, a booster piston spring 10, a booster piston sleeve 11, an intake valve 13, a booster chamber 14, a servo oil chamber 16, and the like. Piezoelectric-electromagnetic control part 2 mainly includes control gas solenoid valve 33, gas needle valve limit rod 35, gas needle valve control chamber 38, fuel needle valve control chamber 39, injection device inner cylinder 41, and fuel oil piezoelectric control valve 44 , Control valve sleeve 45 and so on. The inner cylinder 41 of the injection device is designed with an annular oil groove 43 , an oil passage 42 , an oil passage 34 and a central air passage 46 . The high-pressure control oil flowing in from the high-pressure fuel inlet 6 flows through the annular oil groove 43 and is divided into two paths, one path flows into the oil passage 34, and then flows into the gas needle valve control chamber 38 and the high-pressure oil ring belt 58 that controls the gas solenoid valve 33; The oil passage 42 flows into the fuel needle valve control cavity 39 and the oil storage tank 89 again. The double needle valve nozzle part 4 mainly includes a gas nozzle 75, a fuel nozzle 76, a needle valve base 77, a nozzle cover 78, a sealing ring 79, etc., and the gas nozzle 75 and the fuel nozzle 76 share a needle valve base 77. The gas nozzle 75 is made up of a gas needle valve spring 80 , a gas needle valve 81 , a gas chamber 83 , a gas injection hole 84 and a sealing ring 86 . An annular step is designed on the upper end of the gas needle valve 81 , and a gas needle valve control chamber 38 is formed between the gas needle valve 81 and the injector body 7 under the annular step. The gas needle valve 81 and the gas needle valve limit rod 35 are coaxially installed, and the control oil enters the gas needle valve control chamber 38 through the central oil channel 37 on the gas needle valve limit rod 35 . A sealing ring 86 is designed between the gas needle valve 81 and the needle valve base 77 , and part of the control oil is introduced into the sealing ring 86 through the oil passage 82 on the needle valve base 77 .

Booster solenoid valve 8 is composed of solenoid valve seat 18, solenoid valve spring 19, solenoid valve stem 21, spring washer 22, baffle plate 23, armature 24, solenoid valve body 25, stop ring 26, coil 27, electromagnet 28, etc. . Wherein the solenoid valve rod 21 is designed with an annular oil band 20, and the solenoid valve seat 18 is designed with a servo oil inlet 29, a servo oil drain 17 and a gas inlet 12. When the solenoid valve 8 is not energized, the annular oil belt 20 communicates with the oil drain port 17 and the servo oil chamber 16 through the oil passage; The intake valve 13 is a one-way valve, installed on the booster piston sleeve 11, and mainly includes an intake valve seat 30, an intake valve spring 31, an intake valve stem 32, and the like.

Control gas solenoid valve 33 mainly includes solenoid valve body 47, electromagnet 48, coil 49, armature 50, valve stem upper sealing base 52, solenoid valve spring 53, solenoid valve stem 54, valve stem lower sealing base 55, stop ring 63 etc. The solenoid valve stem 54 is designed with two sealing cones, and is designed with a high-pressure oil ring 58 and a low-pressure oil ring 60. When the gas solenoid valve 33 is not energized, the solenoid valve stem 54 acts on the solenoid valve spring 53. Press down on the lower sealing base 55 of the valve stem, the high-pressure oil ring 58 is closed, and the low-pressure oil ring 60 is opened; when the control gas solenoid valve 33 is energized, the solenoid valve stem 54 lifts up and presses on the upper sealing base 52 of the valve stem, The low-pressure oil ring belt 60 is closed, and the high-pressure oil ring belt 58 is opened.

Control fuel piezoelectric control valve 44 mainly includes piezoelectric element 64, elastic gasket 65, change piston 66, change piston spring seat 67, change piston spring 68, control valve stem 69, control valve seat 70, control valve spring 71, seal Circle 74 et al. A low-pressure oil ring 73 is designed on the control valve stem 69. When the piezoelectric control valve 44 is not energized, the lower end of the control valve stem 69 is stuck on the control valve spring 71, and is pressed against the control valve seat 70 under the action of the control valve spring 71. Close the low-pressure oil ring belt 73.

The combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device of the utility model is mainly composed of a gas booster part 1, a piezoelectric-electromagnetic control part 2, a double needle valve nozzle part 4 and an injection device body 7. The injector body 7 has a first low-pressure oil drain port 3, a second low-pressure oil drain port 5, a high-pressure fuel inlet 6, etc., and a gas inlet 12 is designed on the gas booster part 1.

The gas pressurized part 1 is located above the injection device body 7, and the two are connected by threads. The gas booster part 1 mainly includes a booster solenoid valve 8, a booster piston 9, a booster piston spring 10, a booster piston sleeve 11, an intake valve 13, a booster chamber 14, a servo oil chamber 16, and the like. Wherein, booster solenoid valve 8 is made of solenoid valve seat 18, solenoid valve spring 19, solenoid valve rod 21, spring washer 22, baffle plate 23, armature 24, solenoid valve body 25, stop ring 26, coil 27, electromagnet 28 and so on. The intake valve 13 is a one-way valve, installed on the booster piston sleeve 11, and mainly includes an intake valve seat 30, an intake valve spring 31, an intake valve stem 32, and the like. The solenoid valve stem 21 of the booster solenoid valve 8 is designed with an annular oil belt 20 , and the solenoid valve seat 18 is designed with a servo oil inlet 29 , a servo oil drain 17 and a gas inlet 12 . One end of the solenoid valve stem 22 is fixed on the solenoid valve armature 24 through the stop ring 26, and can move left and right together with the armature 24. 23 on. The electromagnetic valve seat 18 can limit the lift of the electromagnetic valve rod 21, and an oil passage is designed on it, which can guide part of the servo oil to flow through the electromagnetic valve 8, cool the electromagnetic valve 8 and reduce the armature of the electromagnetic valve. 24 and the effect of the shock and vibration of valve rod 21 left and right motions. A servo oil chamber 16 is formed between the pressure surface above the big head of the booster piston 9 and the piston sleeve 11 and the solenoid valve seat 18, and a booster chamber 14 is formed between the pressure surface below the small head of the booster piston 9 and the piston sleeve 11. The return spring 32 of the intake valve 13 has a small pretightening force and low opening pressure. When the gas enters the intake valve 13, the valve stem 33 is opened under the action of the gas, and the gas enters the booster chamber 14; When the gas pressure in the pressure chamber 14 rises, the intake valve 13 is closed. The booster piston 9 and the booster piston sleeve 11 are a pair of precision couples with a small matching gap and a large contact length, which can effectively prevent the gas in the booster chamber 14 from going up and prevent the fuel oil in the servo oil chamber 16 from leaking; A large cavity 15 is formed between the big head of the pressure piston 9 and the groove of the piston sleeve 11. Even if some gas and fuel oil leak into the cavity 15, the mixing of oil and gas in the cavity can hinder its further mutual penetration. The oil film formed on the surface is in a dynamic equilibrium state during the piston movement, which can further prevent gas leakage.

Piezoelectric-electromagnetic control part 2 mainly includes control gas solenoid valve 33, gas needle valve limit rod 35, gas needle valve control chamber 38, fuel needle valve control chamber 39, injection device inner cylinder 41, and fuel oil piezoelectric control valve 44 , Control valve sleeve 45 and so on. The control valve sleeve 45 and the injection device inner cylinder 41 are installed in the injection device body 7 , and the control gas solenoid valve 33 and the fuel oil piezoelectric control valve 44 are installed in the control valve sleeve 45 and the injection device inner cylinder 41 . The gas needle valve limit rod 35 is installed below the control gas solenoid valve 33, and a central oil passage 37 is designed on it to connect to the gas needle valve control chamber 38. Control gas solenoid valve 33 mainly includes solenoid valve body 47, electromagnet 48, coil 49, armature 50, valve stem upper sealing base 52, solenoid valve spring 53, solenoid valve stem 54, valve stem lower sealing base 55, stop ring 63 etc. A solenoid valve cavity 62 is formed between the solenoid valve body 47 and the upper sealing base 52 of the valve stem, and a groove cavity 59 is formed between the upper sealing base 52 of the valve stem and the lower sealing base 55 of the valve stem. The electromagnet 48 is installed in the solenoid valve cavity 62 of the solenoid valve body 47, the armature 50 is located below the electromagnet 48, one end of the solenoid valve stem 54 is stuck on the armature 50 through the stop ring 63, and the other end runs through the valve below the armature 50. The upper sealing base 52 of the stem is pressed on the lower sealing base 55 of the valve stem. The solenoid valve stem 54 is designed with two sealing cones, and is designed with a high-pressure oil ring 58 and a low-pressure oil ring 60. When the gas solenoid valve 33 is not energized, the solenoid valve stem 54 acts on the solenoid valve spring 53. Press down on the lower sealing base 55 of the valve stem, the high-pressure oil ring 58 is closed, and the low-pressure oil ring 60 is opened, as shown in Figure 2(d), at this time the gas needle valve control chamber 38 and the first low-pressure oil drain port 3 Connected; when the gas solenoid valve 33 is energized, the solenoid valve stem 54 lifts and presses on the sealing base 52 on the valve stem, the low-pressure oil ring belt 60 is closed, and the high-pressure oil ring belt 58 is opened, as shown in Figure 2(e), At this time, the gas needle valve control cavity 38 communicates with the high-pressure oil inlet 6 . An oil passage 51 and an oil passage 61 are designed on the sealing base 52 on the valve stem. The oil passage 61 communicates with the low-pressure oil ring 60 and the solenoid valve cavity 62 . The oil passage 51 communicates with the solenoid valve chamber 62 and the first low-pressure oil drain port 3 . An oil passage 56 and an oil passage 57 are designed on the sealing base 55 under the valve stem. The oil passage 56 communicates with the high-pressure oil ring belt 58 and the high-pressure oil inlet 6, and the oil passage 57 communicates with the groove cavity 59 and the center oil of the gas needle valve limit rod 35. Road 37. The drain oil circuit of the device flows through the solenoid valve, and the heat of the double solenoid valve is taken away by the fuel flow, which plays the role of cooling the solenoid valve, and reduces the impact and vibration of the armature of the solenoid valve moving up and down, thereby improving the work of the double solenoid valve. stability. Control fuel piezoelectric control valve 44 mainly includes piezoelectric element 64, elastic gasket 65, change piston 66, change piston spring seat 67, change piston spring 68, control valve stem 69, control valve seat 70, control valve spring 71, seal Circle 74 et al. The deformation length of the piezoelectric element 64 is highly reliable, and the gas injection rate control precision is high. Change piston spring 68 is installed outside change piston spring seat 67, and its upper end is stuck on the change piston spring seat 67, and its lower end links to each other with control valve seat 70. The change piston 66 and the control valve rod 69 below it are installed inside the change piston spring seat 67 and the control valve seat 70 , and the change piston 66 upper end is stuck on the elastic washer 65 . A control valve oil cavity 72 is formed between the control valve seat 70 and the injection device body 7, and the control valve oil cavity 72 communicates with the fuel needle valve control cavity 39 through an oil passage. A low-pressure oil ring 73 is designed on the control valve stem 69, and the low-pressure oil ring 73 communicates with the second low-pressure oil drain port 5 through an oil passage. The lower end of the control valve spring 71 is supported in the control valve oil chamber 72, and the lower end of the control valve stem 69 is stuck on the control valve spring 71, and is pressed on the control valve seat 70 under the spring preload to close the low-pressure oil ring belt 73. The inner cylinder 41 of the injection device is designed with an annular oil groove 43 , an oil passage 42 , an oil passage 34 and a central air passage 46 . The high-pressure control oil flowing in from the high-pressure fuel inlet 6 flows through the annular oil groove 43 and is divided into two paths, one path flows into the oil passage 34, and then flows into the gas needle valve control cavity 38 and the high-pressure oil sealing ring 58 controlling the gas solenoid valve 33; the other path It flows into the oil passage 42, and then flows into the fuel needle valve control cavity 39 and the oil storage tank 89. The double needle valve nozzle part 4 mainly includes a gas nozzle 75, a fuel nozzle 76, a needle valve base 77, a nozzle cover 78, a sealing ring 79, etc., and the gas nozzle 75 and the fuel nozzle 76 share a needle valve base 77. There are gas inlet passages and air inlet grooves in the middle of the needle valve base 77, and oil inlet grooves and oil inlet passages are all arranged on both sides. The middle air passage introduces high-pressure gas into the gas chamber 83 to meet the air intake requirements of the injection device, the oil passage on one side introduces high-pressure fuel into the oil tank 89 to meet the fuel inlet requirements of the injection device, and the oil passage on the other side introduces part of the fuel into the sealing ring 86 Seal gas. The gas nozzle 75 is made up of a gas needle valve spring 80 , a gas needle valve 81 , a gas chamber 83 , a gas injection hole 84 and a sealing ring 86 . An annular step is designed on the upper end of the gas needle valve 81 , and a gas needle valve control chamber 38 is formed between the gas needle valve 81 and the injector body 7 under the annular step. The gas needle valve 81 and the gas needle valve limit rod 35 are coaxially installed, and the control oil enters the gas needle valve control chamber 38 through the central oil channel 37 on the gas needle valve limit rod 35 . The gas needle valve 81 is pressed on the needle valve base 77 to close the gas injection hole 84 under the pretightening force of the gas needle valve spring 80 . Gas from the booster chamber 14 of the booster part 1 passes through the control valve sleeve 45 and the central gas channel 46 on the inner cylinder 41 of the injection device in sequence, and then enters the gas chamber 83 through the gas channel 85 on the needle valve base 77 . The fuel nozzle 76 mainly includes a fuel needle valve spring 87 , a fuel needle valve 88 , an oil tank 89 , and a fuel injection hole 90 . The fuel needle valve 88 is pressed by the fuel needle valve spring 87 on the needle valve base 77 to close the fuel injection hole 90 . The nozzle cover 78 and the injection device body 7 are threadedly connected and a sealing ring 79 is designed to prevent the high temperature and high pressure gas in the cylinder from entering the injection device double-needle valve nozzle part. The gas nozzle of the combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device of the utility model sprays gas. During the process of lifting and seating the gas needle valve, the gas is easy to leak upward with the movement of the valve stem, and the leaked gas When entering the gas needle valve control chamber 38, the gas injection characteristics will be seriously affected due to the compressibility of the gas. In order to solve this problem, the combined mixed fuel injection device of the present utility model has a sealing ring 86 between the gas needle valve 81 and the needle valve base 77, and the part of the control oil is introduced through the oil channel to seal the gas, which can effectively prevent gas leakage . In addition, the control oil in the gas needle valve control cavity 38 and the sealing oil in the sealing ring 86 are of the same oil, and the oil pressure on the top and bottom of the needle valve is equal, which can effectively ensure that there is no static leakage of the control oil and the sealing oil.

When the engine is working, the control unit collects the input signal of the sensor, drives the pressure boost solenoid valve 8, controls the gas solenoid valve 33 and controls the fuel piezoelectric control valve 44 to work, thereby respectively controlling the gas pressure boost, the gas injection of the gas nozzle 75 and the injection of the fuel nozzle 76. Oil. When the solenoid valve 8 is powered off, the solenoid valve stem 21 pushes against the right side baffle plate 23 under the action of the solenoid valve spring 19. At this time, the annular oil belt 20 communicates with the oil drain port 17 and the servo oil chamber 16, as shown in the figure As shown in 2(d), the servo oil in the servo oil chamber 16 flows to the low-pressure oil drain port 17, the pressure in the servo oil chamber 16 decreases, the booster piston 9 moves upward under the action of the return spring 10, and the gas pressure in the booster chamber 14 drops, The gas that enters the intake valve 13 from the gas inlet 12 pushes the intake valve stem 32, and the supercharging device starts to intake air; when the solenoid valve 8 is energized, the electromagnet 28 attracts the armature 24, and the armature 24 drives the solenoid valve stem 21 to the left At this time, the annular oil belt 20 communicates with the servo oil inlet 29 and the servo oil chamber 16, as shown in Figure 2(e), the servo oil enters the servo oil chamber 16, and the pressure in the servo oil chamber 16 gradually increases, pushing the pressurization Piston 9 descends, and the pressure in boost chamber 14 just begins to rise, and intake valve 13 promptly closes, and boost piston 9 continues descending to gas pressurization in boost chamber 14. The gas in the pressurization chamber 14 enters the gas chamber 83 of the gas nozzle 75 through the gas channel. When the control gas solenoid valve 33 is energized, the solenoid valve stem 54 is lifted, the high-pressure oil ring 58 is opened, the low-pressure oil ring 60 is closed, and the high-pressure oil flows through the high-pressure oil ring 58, the groove cavity 59, and the gas needle valve in sequence. The central oil channel 37 of the rod 35 flows into the gas needle valve control chamber 38, the gas needle valve 81 is lifted rapidly under the action of the high-pressure oil in the gas needle valve control chamber 38, the gas injection hole 84 is opened, and the gas nozzle 75 starts to spray gas; When the solenoid valve 33 is powered off, the solenoid valve stem 54 is pressed against the sealing base 55 under the valve stem under the action of the solenoid valve spring 53, the high-pressure oil ring belt 58 is turned off, the low-pressure oil ring belt 60 is opened, and the gas needle valve control chamber 38 The high-pressure oil flows through the oil passage through the groove chamber 59 and the electromagnetic valve chamber 62 in turn, and then flows from the oil passage 51 to the first low-pressure oil drain port 3, the oil pressure in the gas needle valve control chamber 38 decreases, and the gas needle valve 81 is in the position of the gas needle valve. The valve spring 80 is pressed down on the needle valve base 77 to close the gas injection hole 84, and the gas nozzle 75 stops spraying. When the fuel piezoelectric control valve 44 is powered off, the control valve stem 69 is pressed against the control valve seat 70 under the action of the control valve spring 71, and the low-pressure oil ring belt 73 is shut off. Filled with high-pressure fuel, the upper and lower oil pressures of the needle valve are equal, the fuel needle valve 88 is pressed on the needle valve base 77 to close the fuel injection hole 90 under the action of the fuel needle valve spring 87, and the fuel nozzle 76 does not inject fuel; the piezoelectric control valve 44 is energized , the piezoelectric element 64 stretches, the control valve rod 69 overcomes the spring force of the control valve spring 71 and the hydraulic pressure of the fuel in the control valve oil chamber 72 and moves downward, the low-pressure oil ring belt 73 opens, and the fuel needle valve control chamber 39 The high-pressure oil flows through the oil passage through the control valve oil chamber 72 and the low-pressure oil ring belt 73, and then flows from the oil passage to the second low-pressure oil drain port 5. The oil pressure in the fuel needle valve control chamber 39 drops, and the fuel needle valve 88 is in the oil tank. Under the effect of high-pressure oil in 89, lift up rapidly and open fuel injection hole 90, and fuel injection nozzle 76 starts fuel injection. By changing the power-on time of the piezoelectric control valve 44, the deformation length of the piezoelectric element 64 can be flexibly adjusted, thereby changing the lift of the control valve 69, and because the control valve 69 determines the built-in pressure and pressure relief of the fuel needle valve control chamber 39 , the maximum lift of the fuel needle valve 88 is also adjustable with the change of the electrification time length, therefore, the fuel injection rate of the fuel nozzle 76 is adjustable. According to the working conditions of the engine, the working state and working order of the boost solenoid valve 8, the control gas solenoid valve 33 and the fuel piezoelectric control valve 44 can be selected to realize various oil and gas injection modes.

It can be seen from the above working process that the combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device uses double needle valve nozzles to inject fuel, which saves space and simplifies the engine structure. In the fuel injection process of each nozzle, only when the solenoid valve or piezoelectric control valve is working, the injection device only injects fuel or gas, and the maximum lift of the needle valve controlled by the piezoelectric element is adjustable, which can meet the variability requirements of the system's fuel injection rate; When the valve and the piezoelectric control valve work at the same time, the device injects gas and fuel at the same time; when the piezoelectric control valve and the solenoid valve operate successively, the two fuels are injected sequentially. The gas injection process can be switched between supercharged and non-supercharged modes, the injection pressure is adjustable, and the fuel injection rule is flexible. Oil and gas mixing requirements under working conditions. The nozzle part uses fuel oil to seal the gas, which can effectively prevent gas leakage, and the control oil and sealing oil use the same oil, which can effectively prevent the static leakage of fuel in the control chamber and the sealing ring. Therefore, the utility model can make the engine meet the requirements of increasingly strict emission regulations, and effectively improve its power, economy and reliability.

The combined piezoelectric fuel injection-supercharged electromagnetic jet mixed fuel injection device includes a gas booster part, a piezoelectric-electromagnetic control part, a double-needle valve nozzle part and an injection device housing. There is a high-pressure fuel inlet and two low-pressure oil drain ports on the injection device housing, and the gas inlet is designed in the pressurized part. The supercharging part mainly includes controlling the supercharging solenoid valve, supercharging piston, supercharging piston sleeve, piston return spring, intake valve, etc. The piezoelectric-electromagnetic control part mainly includes the control gas solenoid valve, the fuel control piezoelectric control valve, the control valve sleeve, the injection device inner cylinder, the gas needle valve limit rod, the gas needle valve control chamber, the fuel needle valve control chamber, etc. The control valve sleeve and the injection device inner cylinder are installed in the injection device body, and the control gas solenoid valve and the fuel oil piezoelectric control valve are positioned and installed in the control valve sleeve and the injection device inner cylinder. The double needle valve nozzle part mainly includes gas needle valve, gas needle valve spring, fuel needle valve, fuel needle valve spring, needle valve base, sealing ring, nozzle cover, etc. The gas needle valve and fuel needle valve share a needle valve base.

The solenoid valve of the gas booster part includes a solenoid valve body, an electromagnet, a coil, a solenoid valve stem, a solenoid valve seat, an armature, a stop ring, a solenoid valve spring, a baffle, and the like. The coil and the electromagnet are installed in the solenoid valve body, the armature is located on the right side of the electromagnet, one end of the valve stem of the solenoid valve is stuck on the armature through the stop ring, and the other end is pressed against the baffle under the action of the spring force. The solenoid valve seat is designed with a servo oil inlet and drain port, and the solenoid valve stem is designed with an annular oil belt. When the solenoid valve is energized, the valve stem moves to the left, and the annular oil belt connects the servo oil inlet and the servo oil chamber. Enter the servo oil chamber; when the solenoid valve is powered off, the solenoid valve stem is pushed against the right baffle, the annular oil belt is connected to the servo oil chamber and the oil drain port, and the servo oil flows to the low-pressure oil drain port.

Control gas solenoid valve mainly includes solenoid valve body, electromagnet, coil, armature, solenoid valve stem, stem upper sealing base, valve stem lower sealing base, solenoid valve spring, stop ring, etc. An electromagnetic valve cavity is formed between the electromagnetic valve body and the upper sealing base of the valve stem, and a groove cavity is formed between the upper sealing base of the valve stem and the lower sealing base of the valve stem. The electromagnet is installed in the electromagnetic valve cavity, the armature is located below the electromagnet, one end of which is stuck on the armature through the stop ring, and the other end passes through the upper sealing base of the valve stem below the armature, and is pressed on the lower sealing base of the valve stem. The sealing base on the valve stem is designed with two oil passages, one oil passage connects the groove chamber and the solenoid valve chamber, and the other oil passage connects the solenoid valve chamber and the first low-pressure oil drain port, and the drain oil passage flows through the solenoid valve body. The sealing base under the valve stem is designed with two oil passages, one oil passage connects the high-pressure oil ring belt and the gas needle valve control chamber, and the other oil passage connects the oil chamber under the valve stem of the solenoid valve and the second low-pressure oil drain port.

There are two annular oil bands designed on the valve stem of the control gas solenoid valve. The lower annular oil band is connected to the high-pressure oil inlet through the oil passage, and the upper annular oil band is connected to the low-pressure oil drain port through the oil passage.

The control gas solenoid valve stem is designed with two sealing cones, the upper sealing cone seals the low-pressure oil ring, and the lower sealing cone seals the high-pressure oil ring. The solenoid valve stem is seated, the high-pressure oil circuit is shut off, and the gas needle valve control chamber is connected to the low-pressure oil circuit; the solenoid valve stem is lifted, the low-pressure oil circuit is shut off, and the gas needle valve control chamber is connected to the high-pressure oil circuit.

The piezoelectric control valve for controlling fuel mainly includes piezoelectric elements, elastic gaskets, changing pistons, changing piston spring seats, changing piston springs, control valve stems, control valve seats, control valve springs, sealing rings, etc. The changing piston spring is installed outside the changing piston spring seat, its upper end is stuck on the changing piston spring seat, and the lower end is connected with the control valve seat. The change piston and the control valve stem below it are installed inside the spring seat of the change piston and the control valve seat, and the upper end of the change piston is stuck on the elastic gasket. A control valve oil chamber is formed between the control valve seat and the injector body, and the oil chamber of the control valve communicates with the control chamber of the fuel needle valve through an oil passage. A low-pressure oil ring is designed on the control valve stem, and the low-pressure oil ring communicates with the second low-pressure oil drain port through an oil passage. The lower end of the control valve spring is supported in the oil chamber of the control valve, and the lower end of the control valve stem is stuck on the control valve spring, and pressed against the control valve seat under the action of spring preload to close the low-pressure oil ring.

The upper end of the gas needle valve is designed with a circular step. The gas needle valve control chamber is formed between the needle valve and the injection device body under the circular step. The lower end of the gas needle valve limit rod is sleeved inside the circular step of the gas needle valve. The gas needle valve limit rod and the gas needle valve are provided with a central oil passage along the axis, and the gas needle valve control cavity communicates with the electromagnetic valve groove cavity through the oil passage.

The gas nozzle and the fuel nozzle share a high-pressure fuel inlet, and an annular oil groove is designed between the injection device body and the inner cylinder of the injection device to communicate with the fuel oil, the oil channel of the gas nozzle and the high-pressure oil inlet. The high-pressure oil enters the annular oil groove and is divided into two paths. One path of high-pressure oil flows into the fuel needle valve control chamber and the oil tank of the fuel nozzle through the oil passage; the other path of high-pressure oil flows into the high-pressure oil ring belt of the gas solenoid valve and the sealing ring of the gas nozzle through the oil passage. bring.

Above the gas chamber of the gas nozzle, an annular sealing belt is designed between the gas needle valve and the needle valve base, and an annular oil groove and an oil passage are opened on the needle valve base to introduce part of the control oil into the annular sealing belt.

Claims (3)

1. combination type piezoelectric fuel injection-supercharging electromagnetism jet hybrid fuel jet device, is characterized in that: include combustion gas compression portion, Injection apparatus body, control valve pocket, injection apparatus inner core, needle-valve base, fuel oil spout part, fuel gas injection part, control valve pocket Being arranged on from top to bottom in injection apparatus body with injection apparatus inner core, needle-valve base is arranged under injection apparatus body by nozzle cage Side, needle-valve base includes fuel oil base and combustion gas base；

Described compression portion includes boost electromagnetic valve, charged piston, charged piston set, intake valve, and charged piston set is arranged on spray Above injection device body, boost electromagnetic valve includes boost electromagnetic valve seat, supercharging electric magnet, supercharging armature, boost electromagnetic valve bar, supercharging Arranging servo oil oil-in and servo oil drain tap in solenoid valve seat, boost electromagnetic valve bar one end is fixed on by supercharging locating snap ring On supercharging armature, the other end runs through boost electromagnetic valve seat and under being placed on the effect of pretightning force of boost electromagnetic valve spring thereon Being pressed on baffle plate, supercharging armature position forms supercharging armature chamber, and boost electromagnetic valve spring position forms supercharging electromagnetism Valve spring chamber, boost electromagnetic valve bar arranges annular oil band, and annular oil band realizes servo oil by the movement of boost electromagnetic valve bar The connection of oil-in and supercharging armature chamber or disconnect and the connection of servo oil drain tap and boost electromagnetic valve spring cavity or disconnection； Charged piston be arranged on charged piston set in, charged piston set is arranged on below boost electromagnetic valve seat, charged piston upper end with Form servo oil pocket between charged piston set and boost electromagnetic valve seat, formed between charged piston bottom and charged piston set Pumping chamber, charged piston is cased with charged piston spring；Intake valve is check valve, is arranged in charged piston set, charged piston Put and fuel gas inlet is set, fuel gas inlet connection intake valve, the outlet pumping chamber of intake valve；

Described fuel oil part includes piezoelectric element, conversion piston, conversion piston spring seat, controls valve rod, control valve seat, fuel oil pin Valve, piezoelectric element is arranged in control valve pocket, and conversion piston spring seat and control valve seat are arranged in injection apparatus from top to bottom In Tong, conversion piston is positioned in conversion piston spring seat, is positioned at the control valve rod below conversion piston and is arranged in control valve seat, The upper end of conversion piston is stuck on elastomeric pad, and elastomeric pad is positioned at below piezoelectric element, is cased with outside conversion piston spring seat Conversion piston spring, the upper end of conversion piston spring is stuck on conversion piston spring seat, and its lower end withstands on control valve seat, controls Form control valve oil pocket between valve seat and injection apparatus body, form fuel pin between fuel oil base and injection apparatus body and control Chamber, fuel pin is arranged in fuel oil base, forms oil holding slot, control valve oil pocket and fuel oil between fuel pin and fuel oil base Needle control chamber is communicated by left oil duct and right oil duct, controls to arrange valve rod low pressure oil annulus on valve rod, injection apparatus body sets Put the second low pressure drain tap and high pressure fuel entrance, valve rod low pressure oil annulus and the second low pressure drain tap to communicate, control valve spring Being enclosed within the bottom controlling valve rod, the bottom of control valve spring is supported on injection apparatus body, and fuel pin spring is placed on fuel oil The upper end of needle-valve, the upper end of fuel pin spring is supported on injection apparatus body, and oil holding slot connects high pressure by fuel oil oil duct Fuel filler, fuel oil oil duct controls chamber with fuel pin and communicates；

Described fuel gas injection part includes controlling gas electromagnetic valve, combustion gas needle-valve gag lever post and combustion gas needle-valve, and described control is fired Pneumoelectric magnet valve includes sealed base on electromagnetic valve body, electric magnet, armature, valve rod, valve rod lower seal base, electromagnetic valve spring, electricity Magnet valve valve rod, electromagnetic valve body is arranged in control valve pocket, electromagnetic valve body, valve rod upper seal support, valve rod bottom sealing socket and combustion gas Needle-valve gag lever post is arranged from top to bottom, electromagnetic valve body and valve rod is formed between sealed base electromagnetism valve pocket, valve rod seals the end Forming groove cavity between seat and valve rod lower seal base, electric magnet is arranged in electromagnetism valve pocket, and armature is positioned at below electric magnet, electricity One end of magnet valve valve rod is stuck on armature by locating snap ring, and the other end runs through sealed base on the valve rod below armature, and and valve Bar lower seal base matches, electromagnetic valve valve rod is respectively provided with the upper sealing cone coordinated with sealed base on valve rod and with The lower seal conical surface of valve rod lower seal base engagement, the part that electromagnetic valve valve rod matches with sealed base on valve rod forms low pressure Oil ring band, the part that electromagnetic valve valve rod matches with valve rod lower seal base forms hydraulic oil annulus, on valve rod on sealed base First oil duct and the 4th oil duct are set, valve rod lower seal base arrange the second oil duct and the 3rd oil duct, in injection apparatus inner core 5th oil duct of connection high pressure fuel entrance is set, injection apparatus body arranges the first low pressure drain tap, the first oil duct connection electricity Magnet valve chamber and the first low pressure drain tap, the second oil duct connection hydraulic oil annulus and the 5th oil duct, arrange in combustion gas needle-valve gag lever post Central oil passage, the 3rd oil duct communication groove chamber and central oil passage, the 4th oil duct connection low pressure oil annulus electromagnetism valve pocket, combustion gas needle-valve It is positioned at below combustion gas needle-valve gag lever post, between combustion gas needle-valve and combustion gas base, forms seal band and fuel chamber, sealing ring respectively Band connection the 5th oil duct, fuel chamber is connected in charged piston set with the blast tube controlled in valve pocket by injection apparatus inner core Pumping chamber, combustion gas base end arranges gas jet orifice.

Combination type piezoelectric fuel injection the most according to claim 1-supercharging electromagnetism jet hybrid fuel jet device, its feature It is: when control gas electromagnetic valve is not powered on, electromagnetic valve valve rod is pressed on valve rod lower seal base under the effect of electromagnetic valve spring, Hydraulic oil annulus is closed, low pressure oil annulus is opened；Control gas electromagnetic valve energising time, electromagnetic valve valve rod lift be pressed on valve rod close On back cover seat, low pressure oil annulus is closed, hydraulic oil annulus is opened.

Combination type piezoelectric fuel injection the most according to claim 1 and 2-supercharging electromagnetism jet hybrid fuel jet device, it is special Levy and be: during piezoelectric element energising, control valve rod and overcome control valve spring active force, valve rod low pressure oil annulus to open；Piezoelectric element When being not powered on, controlling valve rod and be pressed on control valve seat under control valve spring effect, valve rod low pressure oil annulus is closed.