Durable side gas inlet fuel gas ejector structure

Abstract

The utility model discloses a durable side air inlet fuel gas ejector structure which comprises an injection molding shell, a containing cavity is formed in the injection molding shell, an installation column is arranged in the containing cavity, and the installation column and the injection molding shell are fixedly installed. The air inlet shell is fixedly connected to the lower end of the injection molding shell, a valve seat is arranged in the air inlet shell, the valve seat is fixedly connected with the inner wall of the air inlet shell, a sliding stroke is formed between the valve seat and the mounting column, a movable iron core is arranged in the sliding stroke in a sliding mode, a wear-resisting ring is arranged on the circumferential face of the movable iron core, and a wear-resisting piece is arranged at the top of the wear-resisting ring; the electromagnetic force in the ejector is enhanced, the abrasion-resistant high polymer material abrasion-resistant ring is arranged on the circumferential face of the vertical moving stroke of the movable iron core, and the abrasion-resistant piece is arranged at the top of the vertical moving stroke of the movable iron core. The composite material has excellent comprehensive properties such as high temperature resistance, self-lubrication, corrosion resistance, flame retardance, hydrolysis resistance, wear resistance and fatigue resistance, and is relatively high in wear resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas injection, and in particular relates to a durable side-intake gas injector structure. Background Art

[0002] The gas injector is a key component for realizing quantitative injection of gas fuel in gas engines. Its working characteristic is to inject a corresponding volume of gas fuel into the intake duct or cylinder within milliseconds according to the fuel supply requirements of different engine working conditions. The vehicle gas (natural gas, liquefied petroleum gas, hydrogen, etc.) injector controls the switch of the valve through the PWM signal, and the opening and closing of the valve is controlled by the high-frequency up and down movement of the moving iron core. When the signal is at a high level, the current causes the coil in the gas injector to generate a magnetic field to absorb the moving iron core, allowing the valve to open and the gas to be ejected from the injector outlet joint. When the electrical signal disappears (low level), the electromagnetic force also disappears. At this time, the reset spring pushes the moving iron core to close the nozzle. The moving iron core reciprocates at a high frequency (<100Hz) in such a state.

[0003] Compared with conventional fuel injectors, since the moving iron core of the gas injector is completely free of oil lubrication during actual operation, the moving iron core will produce dry friction with the cavity, and the wear of the moving iron core is very large. If the surface of the moving iron core is not treated with wear resistance or structural adjustment, the entire service life of the injector will be shortened. At present, the service life of mainstream gas injectors will be much shorter than that of mainstream fuel injectors. In the actual use of vehicles, gas injectors are even treated as wearing parts. The friction parts of existing mainstream gas injectors are all made of metal parts with wear-resistant coatings, with a nominal life of more than 400 million working cycles. The actual service life on the vehicle is about 15 months before the injector needs to be replaced. The reason for replacement is mostly due to the wear of metal parts, which leads to an increase in the movement stroke of the moving iron core (the moving iron core stroke increases, and the injector flow coefficient increases), which ultimately leads to an abnormal increase in the injector flow and requires replacement. The existing gas injectors have low wear resistance, resulting in a shortened service life. In addition, the thickness of the wear-resistant coating applied on the friction parts is relatively thin (generally between 0.001 and 0.03), and the risk factor is high when used. Quality problems such as coating damage or shedding caused by the processing process may cause engine abnormalities. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model aims to provide a durable side-intake gas injector structure.

[0005] The technical solution adopted by the utility model includes:

[0006] An injection molded shell, wherein a cavity is formed inside the shell, and a mounting column is arranged in the cavity, and the mounting column is fixedly mounted to the injection molded shell;

[0007] An air inlet housing is fixedly connected to the lower end of the injection molded shell, and a valve seat is arranged inside the housing. The valve seat is fixedly connected to the inner wall of the air inlet housing, and a sliding stroke is formed between the valve seat and the mounting column. A moving iron core is slidably arranged in the sliding stroke, and a wear-resistant ring is arranged on the circumference of the moving iron core. A wear-resistant sheet is arranged on the top of the wear-resistant ring, and the wear-resistant sheet is sleeved on the mounting column;

[0008] A static iron core is installed in the installation column. A spring is fixedly provided at one end of the static iron core close to the moving iron core, and the other end of the spring is fixedly connected to the moving iron core.

[0009] As a preferred embodiment of the utility model, an electrode sheet is provided in the injection molded shell, and the electrode sheet is embedded and installed in the injection molded shell. An electromagnetic coil is provided between the circumference of the mounting column and the injection molded shell, and the electromagnetic coil is electrically connected to the electrode sheet and the static iron core.

[0010] As a preferred embodiment of the present invention, a ball valve is fixedly provided on the valve seat, and the diameter of the ball valve is equal to the inner diameter opened in the moving iron core.

[0011] As a preferred embodiment of the utility model, an air outlet pipe is provided in the air inlet shell, the air outlet pipe is fixedly connected to the inner wall of the air inlet shell, one end of the air outlet pipe forms an air outlet, and the air outlet is connected to the inside of the mounting column through the sliding stroke.

[0012] As a preferred embodiment of the utility model, a sealing ring is provided on the air outlet pipe, and the sealing ring is sleeved on the air outlet pipe.

[0013] As a preferred embodiment of the utility model, an air inlet is formed on the air inlet housing, the air inlet is communicated with the interior of the mounting column, a filter is provided on the air inlet, and the filter is fixedly connected to the air inlet housing.

[0014] As a preferred embodiment of the utility model, a tail cover is provided on the top of the injection molded shell, and the tail cover is connected to the top of the injection molded shell.

[0015] The beneficial effects of the utility model are:

[0016] As a durable side-intake gas injector structure, the utility model enhances the electromagnetic force inside the injector, and is provided with a friction-resistant polymer wear-resistant ring on the circumference of the moving iron core's up and down movement stroke, and a wear-resistant sheet is provided on the top of the moving iron core's up and down movement stroke. The wear-resistant ring and the wear-resistant sheet have excellent comprehensive properties such as high temperature resistance (long-term use temperature>200°C), self-lubrication (the friction pair matched with the metal material moving iron core does not require any lubricating medium to achieve an extremely low friction coefficient), corrosion resistance (almost resistant to all acids and alkalis and lubricating oils, fuel oils), flame retardancy, hydrolysis resistance, wear resistance (having strength and creep resistance similar to metal and elasticity and toughness similar to rubber) and fatigue resistance (no cracks or fractures will occur under high-frequency impact). The friction coefficient of the friction pair structure matched with the wear-resistant ring, the wear-resistant sheet and the metal parts (soft magnetic materials) is extremely stable, and the injector flow rate will not change due to the change of the friction coefficient due to the increase of the working cycle, thereby improving the service life and the accuracy of the gas injection amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0019] Figure 2 This utility model Figure 1 A schematic diagram of the enlarged structure at point A;

[0020] Figure 3 It is a schematic diagram of the overall structure of the utility model.

[0021] In the figure: 1. Injection molded shell; 2. Electrode sheet; 3. Static iron core; 4. Electromagnetic coil; 5. Air inlet shell; 6. Valve seat; 7. Air inlet; 8. Air outlet pipe; 9. Air outlet; 10. Sealing ring; 11. Filter screen; 12. Moving iron core; 13. Wear-resistant ring; 14. Wear-resistant sheet; 15. Tail cover; 16. Spring; 17. Mounting column; 18. Ball valve; 19. Sliding stroke. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0024] Combine the following Figure 1-3 The specific implementation of the utility model is described, a durable side intake gas injector structure, comprising:

[0025] The injection molded housing 1 has a cavity formed inside thereof, and a mounting post 17 is provided in the cavity. The mounting post 17 is fixedly mounted to the injection molded housing 1. The interior of the injection molded housing 1 is a hollow structure, which provides an installation space for the installation connection of the mounting post 17. The mounting post 17 is limitedly embedded in the injection molded housing 1;

[0026] The air intake housing 5 is fixedly connected to the lower end of the injection molded housing 1. The air intake housing 5 and the injection molded housing 1 are fixedly connected to each other and form an integrated structure. As the external structure of the injector, a valve seat 6 is provided inside the injector. The valve seat 6 is fixedly connected to the inner wall of the air intake housing 5. A sliding stroke 19 is formed between the valve seat 6 and the mounting column 17. A moving iron core 12 is provided to slide inside the sliding stroke 19. The moving iron core 12 slides up and down in the sliding stroke 19 formed between the valve seat 6 and the mounting column 17. By moving the moving iron core 12 upward, the oil passage in the valve seat 6 and the inside of the mounting column 17 are connected to each other, so that the fuel gas is injected into the combustion chamber. The moving iron core 12 moves down to the valve seat 6, and the oil passage in the valve seat 6 and the inside of the mounting column 17 are not connected to each other, so that the fuel gas injection into the combustion chamber cannot be realized. In the injection of fuel gas, a wear-resistant ring 13 is provided on the circumference of the movable iron core 12, and a wear-resistant sheet 14 is provided on the top of the wear-resistant ring 13. The wear-resistant sheet 14 is sleeved on the mounting column 17. The wear-resistant ring 13 is located on the circumference of the movable iron core 12, and serves as a medium for friction with the circumferential wall of the movable iron core 12. The wear-resistant sheet 14 is located at the top of the sliding stroke 19 of the movable iron core 12, and serves as a friction medium when the movable iron core 12 slides to the top contact point. The wear-resistant ring 13 and the wear-resistant sheet 14 are arranged to reduce the wear caused by the metal parts that limit the movable iron core 12 during its up and down movement. Since the wear-resistant ring 13 and the wear-resistant sheet 14 have greater wear resistance, the long-term high-frequency operation of the movable iron core 12 has a lower loss on the wear resistance and the wear-resistant sheet 14, thereby improving the service life of the fuel gas injector;

[0027] The static iron core 3 is installed in the installation column 17. A spring 16 is fixedly provided at one end of the static iron core 3 close to the moving iron core 12. The other end of the spring 16 is fixedly connected to the moving iron core 12. The static iron core 3 and the spring 16 are used for the upward movement of the moving iron core 12 and the resetting after the upward movement, so as to control the injection of the fuel gas and the precise control of the injection amount.

[0028] Please refer to Figure 1-2 As shown, an electrode sheet 2 is provided in the injection molded shell 1, and the electrode sheet 2 is embedded and installed in the injection molded shell. An electromagnetic coil 4 is provided between the circumference of the installation column 17 and the injection molded shell 1, and the electromagnetic coil 4 is electrically connected to the electrode sheet 2 and the static iron core 3. The electromagnetic coil 4 is plugged into the power connection interface on the car through the electrode sheet 2. By supplying power to the electromagnetic coil 4, the magnetic attraction of the static iron core 3 is increased to drive the moving iron core 12 to overcome the spring 16 and move upward, so as to achieve the closure of the oil channel by the moving iron core 12, and finally realize the injection of gas into the cylinder. After the electromagnetic coil 4 stops being supplied with power, the moving iron core 12 is reset under the action of the spring 16, so as to achieve the closure of the oil channel and wait for the next gas injection.

[0029] Please refer to Figure 2 As shown, a ball valve 18 is fixedly provided on the valve seat 6, and the diameter of the ball valve 18 is equal to the inner diameter opened in the moving iron core 12. The valve ball is located on the valve seat 6 and is aligned with the through hole inside the moving iron core 12. When the moving iron core 12 is located on the valve seat 6, the valve ball prevents the interior of the mounting column 17 from being connected to the oil outlet.

[0030] Please refer to Figure 1-2 As shown, the wear-resistant ring 13 and the wear-resistant sheet 14 are made of polymer materials and are made of one or more of polyimide (PI), polyamide (PA), polyoxymethylene (POM), polyetheretherketone (PEEK), polybenzimidazole (PBI), polytetrafluoroethylene (PTFE), and polyurethane (PU). The wear-resistant ring 13 and the wear-resistant sheet 14 have high temperature resistance (long-term use temperature> 200°C), self-lubrication (friction pairs with metal moving iron core 12 can achieve extremely low friction coefficient without any lubricating medium), corrosion resistance (almost resistant to All acids and alkalis and lubricating oils, fuel oils), flame retardancy, hydrolysis resistance, wear resistance (similar to metal strength and creep resistance with rubber-like elasticity and toughness) and fatigue resistance (no cracks or breakage under high-frequency impact) and other excellent comprehensive properties reduce the wear caused by the moving iron core 12 when it slides within the sliding stroke, avoid excessive wear of the moving iron core 12 due to long-term high-frequency operation, and increase the sliding stroke 19 of the moving iron core 12, which improves the accuracy of the gas injection amount in the combustion chamber to a certain extent and increases the service life of the injector.

[0031] Please refer to Figure 2 As shown, an air outlet pipe 8 is provided in the air inlet shell 5, and the air outlet pipe 8 is fixedly connected to the inner wall of the air inlet shell 5. An air outlet port 9 is formed at one end of the air outlet pipe 8, and the air outlet port 9 is connected to the inside of the mounting column 17 through the sliding stroke 19. The air outlet port 9 is used for exhaust after the moving iron core 12 is reset, and the exhausted gas is directly discharged through the air outlet pipe 8.

[0032] Please refer to Figure 1 As shown, a sealing ring 10 is provided on the air outlet pipe 8, and the sealing ring 10 is sleeved on the air outlet pipe 8. The sealing ring 10 is used for sealing after the injector is installed.

[0033] Please refer to Figure 1 As shown, an air inlet 7 is formed on the air inlet shell 5, and the air inlet 7 is connected to the interior of the mounting column 17. A filter screen 11 is provided on the air inlet 7, and the filter screen 11 is fixedly connected to the air inlet shell 5. The filter screen can filter the air passing through the air inlet 7 to prevent dust from entering the interior.

[0034] Please refer to Figure 1 As shown, a tail cover 15 is provided on the top of the injection molded housing 1 , and the tail cover 15 is connected to the top of the injection molded housing 1 to prevent dust from entering the top of the injection molded housing 1 and to protect the internal structure.

[0035] Working principle of this utility model:

[0036] Install the injector above the cylinder and connect the electrode sheet 2 to the power supply;

[0037] The vehicle electronic control system controls the operation of the electromagnetic coil 4. When the electromagnetic coil 4 is energized, the magnetic attraction of the static iron core 3 is increased. Under the action of the strong magnet, the static iron core 3 drives the moving iron core 12 to move upward. During the upward movement of the moving iron core 12, the upward movement distance can be controlled by the electronic control unit, thereby controlling the injection amount. Through the movement of the moving iron core 12, the through hole opened inside the moving iron core 12 is connected to the injection oil channel, thereby realizing the injection in the cylinder.

[0038] Among them, an up and down sliding stroke 19 of the moving iron core 12 is formed between the mounting column 17 and the valve seat 6. The moving iron core 12 slides up and down within the sliding stroke 19. A wear-resistant ring 13 is installed on the circumferential surface of the moving iron core 12. The inner wall of the wear-resistant ring 13 contacts the sliding of the moving iron core 12. At the same time, a wear-resistant sheet 14 is installed on the top of the sliding stroke 19 of the moving iron core 12. The wear-resistant ring 13 and the wear-resistant sheet 14 are used for contact when the moving iron core 12 slides and when it collides with the top when sliding. Since the wear-resistant ring 13 and the wear-resistant sheet 14 are polymer materials, they have excellent comprehensive properties such as high temperature resistance, self-lubrication, corrosion resistance, flame retardancy, hydrolysis resistance, wear resistance and fatigue resistance. They have strong wear resistance and will not cause changes in the injector flow rate due to changes in the friction coefficient due to an increase in the working cycle, thereby improving the service life of the injector and the accuracy of the injection amount.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A durable side-intake gas injector structure, characterized in that: include: An injection molded shell, wherein a cavity is formed inside the shell, and a mounting column is arranged in the cavity, and the mounting column is fixedly mounted to the injection molded shell; An air inlet housing is fixedly connected to the lower end of the injection molded shell, and a valve seat is arranged inside the housing. The valve seat is fixedly connected to the inner wall of the air inlet housing, and a sliding stroke is formed between the valve seat and the mounting column. A moving iron core is slidably arranged in the sliding stroke, and a wear-resistant ring is arranged on the circumference of the moving iron core. A wear-resistant sheet is arranged on the top of the wear-resistant ring, and the wear-resistant sheet is sleeved on the mounting column; A static iron core is installed in the installation column. A spring is fixedly provided at one end of the static iron core close to the moving iron core, and the other end of the spring is fixedly connected to the moving iron core.

2. A durable side-intake gas injector structure according to claim 1, characterized in that: An electrode sheet is arranged in the injection molded shell, and the electrode sheet is embedded and installed in the injection molded shell. An electromagnetic coil is arranged between the peripheral surface of the installation column and the injection molded shell, and the electromagnetic coil is electrically connected to the electrode sheet and the static iron core.

3. A durable side-intake gas injector structure according to claim 2, characterized in that: A ball valve is fixedly arranged on the valve seat, and the diameter of the ball valve is equal to the inner diameter opened in the moving iron core.

4. A durable side-intake gas injector structure according to claim 1, characterized in that: An air outlet pipe is arranged in the air inlet housing, and the air outlet pipe is fixedly connected to the inner wall of the air inlet housing. An air outlet is formed at one end of the air outlet pipe, and the air outlet is communicated with the interior of the mounting column through the sliding stroke.

5. A durable side-intake gas injector structure according to claim 4, characterized in that: The air outlet pipe is provided with a sealing ring, and the sealing ring is sleeved on the air outlet pipe.

6. A durable side-intake gas injector structure according to claim 1, characterized in that: An air inlet is formed on the air inlet housing, the air inlet is communicated with the interior of the mounting column, a filter is provided on the air inlet, and the filter is fixedly connected to the air inlet housing.

7. A durable side-intake gas injector structure according to claim 6, characterized in that: A tail cover is provided on the top of the injection molded shell, and the tail cover is connected to the top of the injection molded shell.

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