CN213039379U - Novel nozzle and spraying unit thereof - Google Patents

Abstract

A novel nozzle and an injection unit thereof comprise an injection part cavity, an oil inlet, an injection valve and at least one spray hole, wherein high-pressure fuel enters the injection cavity from the oil inlet, and the injection valve is opened by pressure and comprises an injection valve spring, an injection valve seat and an injection valve member. The injection valve further comprises a valve stem, the injection valve member being located at one end of the valve stem, the other end of the valve stem being in contact with the injection valve spring, and a sealing element which is movably deformable relative to the injection part chamber and which divides the injection part chamber into an injection chamber and a spring chamber, the valve stem and the injection valve member being designed in one piece, the injection valve spring being arranged in the spring chamber, the spring force of the injection valve spring acting on the valve stem so that the injection valve member abuts against the injection valve seat, the injection valve being closed when not in operation.

Description

Novel nozzle and spraying unit thereof

Technical Field

The invention belongs to the field of engines, and particularly relates to an electronic fuel injection gasoline engine, in particular to an electronic fuel injection device applied to the fields of motorcycles and general use.

Background

Electronically controlled fuel injection systems are widely used to improve fuel economy of engines, reduce exhaust gas pollutants, and improve power performance. The integrated electronic control fuel injection unit is popular in the electronic injection market due to the characteristics of simplified and miniaturized structure, especially in small fuel injection systems such as motorcycles and general gasoline engines.

For the integrated fuel injection unit, the structural design of the nozzle end is very important for controlling the fuel injection flow rate and the precision. The invention patent of China (a half ball valve nozzle and an injection unit thereof) (patent number ZL201310133703.7) discloses a half ball valve type nozzle which is opened and closed by means of fuel pressure, the design of the nozzle needs to comprise a spring chamber positioned outside the injection unit so as to meet the working requirement of a valve element, however, in the working process of the fuel injection unit, high-pressure fuel at the nozzle end inevitably extends the valve element into the spring chamber along with the opening and closing of the half ball valve element, so that fuel droplets with larger particle sizes are caused, and the fuel injection precision is influenced.

In addition, the opening state of the nozzle end of the fuel injection unit is generally obtained by means of initial design values and machining, and the opening pressure and the opening stroke of the valve element are fixed values, which has extremely high requirements on machining precision, thereby increasing the production cost.

Disclosure of Invention

The present invention is directed to the above-mentioned problems, and aims to provide a novel nozzle and a spraying unit thereof, which are reliable in performance, high in accuracy, adjustable and interchangeable.

In order to achieve the purpose, the invention adopts the following technical scheme that the novel nozzle comprises a spraying part cavity, an oil inlet, a spraying valve and at least one spraying hole.

The injection valve comprises an injection valve spring, an injection valve seat, an injection valve member and an injection valve stem, the injection valve member being located at one end of the valve stem, the other end of the valve stem being in contact with the injection valve spring. And a sealing element which is movably deformable relative to the injection chamber and divides the injection chamber into an injection chamber and a spring chamber, wherein the valve stem and the injection valve member are designed as one piece, the injection valve is opened by pressure, the injection valve spring is arranged in the spring chamber, the spring force of the injection valve spring acts on the valve stem to make the injection valve member abut against the injection valve seat, and the injection valve is in a closed state when not in operation. The jet holes can be arranged along the radial direction or the axial direction so as to meet different installation requirements.

The injection valve comprises a filter, the oil inlet is arranged on the oil injection cavity, and the filter is arranged at the oil inlet. High-pressure fuel enters from the oil inlet, is filtered by the filter and then fills the oil injection cavity, the pressure of the oil injection cavity acts on the valve rod, when the pressure of the fuel is higher than the spring force of the injection valve spring, the valve rod drives the valve piece to move towards the direction of the compression spring, the injection valve is opened, the filtered high-pressure fuel is sprayed out from the spray hole, and the volumes of the oil injection cavity and the spring cavity are changed along with the movement of the valve rod.

Further, the deformable sealing member is an elastic membrane, so that the oil injection chamber and the spring chamber are two mutually independent spaces and cannot be in liquid communication, and the valve rod can move by changing the deformation of the sealing member.

An alternative form of the above described deformable seal is: the sealing element is a large end of a valve rod, and the side wall of the large end of the valve rod and the inner surface of the injection cavity form a sliding coupling part, so that liquid communication between the oil injection cavity and the spring chamber is cut off.

The novel nozzle is further improved by comprising a limiting seat and an adjusting ring, wherein the limiting seat is arranged on the opening stroke of the injection valve in the spring chamber and used for limiting the opening stroke of the injection valve rod, so that the opening height of the injection valve is controlled, and the fuel injection amount and precision are ensured. The limiting seat can be designed to be adjustable, and the flow of the nozzle can be adjusted according to the flow demand. The adjusting ring is arranged at one end of the injection valve spring, and the injection valve changes the opening pressure through adjusting the height of the adjusting ring.

An injection unit comprises an electromagnetic force device and a plunger assembly. The electromagnetic force device comprises a coil, an armature, a magnetizer, an inner magnetizer and a magnetism isolating ring. The magnetizer and the armature are made of magnetic conductive materials, such as pure iron and the like, and the magnetism isolating ring is made of non-magnetic conductive materials, such as nonferrous metals or plastics and the like. The plunger assembly includes a plunger, a sleeve, an input valve, and an output valve. The sleeve includes an axial central bore and the plunger is mounted within the central bore of the sleeve. One of the plunger and the sleeve is a moving part, and the outer surface of the plunger is in sliding fit with the central hole of the sleeve. The residual volume among the plunger, the sleeve, the input valve and the output valve forms a pressure-feeding volume, and the residual volume between the electromagnetic force device and the plunger assembly forms a low-pressure oil chamber.

The above spraying unit, an alternative is: the injection unit and the novel injection are integrally designed, an oil inlet of the novel nozzle is communicated with an output end of a pressure feeding volume, specifically, the novel nozzle comprises a low-pressure oil port, an oil injection cavity is connected with the pressure feeding volume through the oil inlet, and a spring chamber is connected with the low-pressure oil cavity through the low-pressure oil port.

The electromagnetic power device, the plunger assembly and the injection part are connected and combined by an outer shell. The outer shell can be composed of one or a plurality of plastic or other high polymer material parts, and can also be formed by one-time die pressing or injection molding. The outer shell comprises an oil inlet nozzle and an oil return nozzle. The fuel enters the low-pressure oil cavity from the oil inlet nozzle and enters the pressure-feeding volume through the oil inlet valve, and one of the plunger or the sleeve reciprocates relative to the static part under the driving of the electromagnetic force device, so that the pressure-feeding volume is alternately changed, and high-pressure fuel is generated and is conveyed to the injection cavity of the injection part.

The spraying unit can be selected from the following alternatives: the injection unit comprises a high-pressure oil pipe, and two ends of the high-pressure oil pipe comprise quick-connection joints. The oil inlet is connected with the output end of the pressure feeding volume through a high-pressure oil pipe, specifically, the oil inlet of the nozzle comprises an oil inlet nozzle, the high-pressure oil pipe is connected to the oil inlet nozzle of the nozzle in a quick connection mode, and the other end of the high-pressure oil pipe is connected with the output end of the pressure feeding volume

The invention is described in further detail below with reference to the figures and specific embodiments.

Drawings

FIG. 1 is a schematic structural diagram of a spraying unit using a novel nozzle according to the present invention.

FIG. 2 is a second schematic structural diagram of a spraying unit using the novel nozzle provided in the present invention.

FIG. 3 is a third schematic structural diagram of an injection unit using the novel nozzle of the present invention.

Fig. 4 is a schematic view of a novel nozzle structure provided by the present invention.

Fig. 5 is a second schematic view of the novel nozzle structure provided by the present invention.

Detailed Description

The structure of the injection unit 1 using the novel nozzle 2 of the present invention is schematically shown in fig. 1, and comprises an electromagnetic force device 3, a plunger assembly 4, a nozzle 2 and an outer casing 5.

The electromagnetic force device 3 comprises a coil 100, an armature 103, a magnetizer 104, an inner magnetizer 102 and a magnetism isolating ring 101. The magnets (104, 102) and the armature 103 are made of a magnetically conductive material, such as pure iron, and the magnetism isolating ring 101 is made of a non-magnetic conductive material, such as nonferrous metal or plastic.

The plunger 106 assembly 4 includes a plunger 106, a sleeve 105, an inlet valve 7, an outlet valve 6, and a return spring 107 that maintains the plunger 106 in an initial position. The plunger 106 is of a cylindrical structure, the sleeve 105 comprises an axial central hole 105a, the body of the plunger 106 is mounted in the axial central hole 105a and can move axially relative to the sleeve 105, and the plunger 106 is positioned at the stroke end position and is tightly attached to the armature 103 due to the action of a return spring 107. The input valve 7 is a slide valve structure including a side hole 109 arranged in a radial direction of the sleeve 105, and the slide valve is composed of the side hole 109, a cylinder wall surface 106a of the plunger 106, and a hole wall of the axial center hole 105 a. The output valve 6 is a ball valve structure, and includes an output valve element 110, an output valve seat 118 and an output valve spring 111, and the output valve 6 is disposed at one end of the sleeve 105. The residual volume among the plunger 106, the sleeve 105, the input valve 7 and the output valve 6 forms a pumping volume 112, and the residual volume between the electromagnetic force device 3 and the plunger 106 assembly 4 forms a low-pressure oil chamber 113.

The structure of the nozzle 2 is schematically shown in fig. 4, and includes a spraying cavity 8, an oil inlet 400, a spraying valve 9 and at least one spraying hole 401. The injection valve 9 comprises an injection valve spring 408, an injection valve seat 402, an injection valve member 403 and a valve stem 406. The injection valve member 403 is located at one end of the valve stem 406, and the valve stem 406 and the injection valve member 403 may be integrally designed by welding or machining. The valve rod 406 includes a large end 411, the side wall of the large end 411 and the inner surface of the injection part cavity 8 form a slide coupling member, the injection part cavity 8 is divided into an injection cavity 404 and a spring chamber 409, the injection valve spring 408 is arranged in the spring chamber 409, the other end of the valve rod 406 contacts with the injection valve spring 408, the spring force of the injection valve spring 408 acts on the valve rod 406, so that the injection valve 403 abuts against the injection valve seat 402, and the injection valve 9 is in a closed state when not in operation. The spray holes 401 may be arranged along the radial direction or the axial direction, so as to meet different installation requirements.

Further, the nozzle 2 further comprises a limiting seat 410 and an adjusting ring 407, wherein the limiting seat 410 is disposed on an opening stroke of the injection valve 9 and used for limiting an opening height of the injection valve 9 so as to control a fuel injection amount. The adjusting ring 407 is provided at one end of the injection valve spring 408, and the injection valve 9 changes the opening pressure by adjusting the height of the adjusting ring 407.

The electromagnetic force device 3, the plunger assembly 4 and the nozzle 2 are connected and combined by an outer shell 5. The outer housing 5 may be made of one or several plastic or other polymer material parts, or may be formed by one-step molding or injection molding. The outer shell 5 comprises an oil inlet nozzle 115, an oil return nozzle 114, a low-pressure flow channel 117 and a high-pressure flow channel 116, the sleeve 105 further comprises a bypass flow channel 108 connecting the oil inlet nozzle 115 and the low-pressure oil chamber 113, and the nozzle 2 comprises an oil inlet 400 and a spring chamber flow channel 413. The oil injection chamber 404 is connected to the pumping volume 112 through the high pressure flow passage 116 and the oil inlet 400, and the spring chamber 409 is communicated with the low pressure oil chamber 113 through the low pressure flow passage 117 and the spring chamber flow passage 413.

The operation of the above-mentioned injection unit 1 is as follows:

in the initial state, the plunger 106 is at rest at the end of the return stroke against the armature 103 by the spring force of the return spring 107, the intake valve is opened, and the fuel introduced from the intake nozzle 115 fills the pumping volume 112, the low-pressure oil chamber 113, and the spring chamber 409 communicating with the low-pressure oil chamber 113 through the bypass flow passage 108 and the side hole 109. The electromagnetic force device 3 is driven by a pulse signal, under the condition of voltage application, a regular magnetic field is formed by the magnetizer 104 and the magnetism isolating ring 101, the armature 103 drives the plunger 106 to move towards the compression stroke direction under the action of the magnetic field, when the wall surface 106a of the plunger covers the side hole 109, the pressure-feeding volume 112 forms a sealed cavity, when the cavity of the pressure-feeding volume 112 is continuously compressed, the internal oil pressure is increased to be larger than the preset opening pressure of the output valve spring 111, the output valve 6 is opened, high-pressure fuel enters the injection cavity 404 after being filtered by a filter, the plunger 106 continuously moves, the fuel pressure generates reverse thrust to the injection valve 9, and when the fuel pressure overcomes the spring force of the injection valve spring 408, the injection valve 9 is opened, and fuel is injected. In the process, part of the fuel is allowed to leak from the valve rod 406 into the spring chamber 409, and the spring chamber 409 is communicated with the low-pressure oil chamber 113, and the pressure is constant.

During this process, the return spring 107 is continuously compressed, potential energy is stored, and when the applied voltage disappears, the plunger 106 stops the compression stroke, the pressure in the oil injection chamber 404 is reduced, and the injection valve 9 is closed. At the same time, the plunger 106 drives the armature 103 to start the return stroke under the spring force of the return spring 107, the output valve 6 is closed, when the wall surface 106a of the plunger gradually leaves the side hole 109, the input valve 7 is opened, and the fuel rapidly enters the pumping volume 112 to be replenished under the negative pressure. The end of the stroke is reached when the plunger 106 returns to the initial position, waiting for the next cycle.

As shown in fig. 2, a second structural schematic diagram of the spraying unit 1 provided by the present invention is different from the first structural schematic diagram of the spraying unit 1 provided by the present invention in that: the moving part of the plunger assembly 4 is a sleeve 105, the sleeve 105 makes axial reciprocating motion relative to the plunger 106, the input valve 7 is a ball valve and comprises an input valve ball 201, an input valve spring 200, an input valve seat 202 and an input valve limiting part 203 acting on the input valve ball 201, the input valve 7 is arranged at one end of the sleeve 105, and the output valve 6 is a ball valve and arranged at one end of the plunger 106. The sleeve 105 is designed as one piece with the armature 103 and is integrally machined from a magnetically conductive material. The structure shown in this embodiment is different from the structure shown in fig. 1 in that: the nozzle 2, as shown in fig. 5, comprises a deformable sealing member 501 arranged on the valve stem 406, a front seat 502 and a rear seat 500, wherein the sealing member 501 is externally encircled between the front seat 502 and the rear seat 500, the oil injection cavity 404 and the spring cavity 409 form two mutually independent spaces, the liquid communication between the two cavities is cut off, and the deformable part of the sealing member 501 deforms along with the movement of the valve stem 406.

As shown in fig. 3, a third structural schematic diagram of the spraying unit 1 provided by the present invention is different from the third structural schematic diagram of the spraying unit 1 provided by the present invention in that: the injection unit 1 comprises a high-pressure oil pipe 300, and the high-pressure oil pipe 300 can be a flexible thin pipe with the inner diameter not larger than 5 mm. The two ends of the high-pressure oil pipe 300 comprise quick joints 301, and the quick joints 301 comprise inversed buckles 302 and are connected with the high-pressure oil pipe 300 into a whole in an injection molding mode. The difference between this embodiment and the schematic structural diagram of the injection unit shown in fig. 1 provided by the present invention is: the output end of the pressure feeding volume 112 comprises an oil outlet nozzle 303, the oil outlet nozzle 303 comprises a locking boss 304, the reverse buckle 302 is elastically deformed to be unfolded under the influence of the size of the pump locking boss 304 due to the axial thrust of the quick connector 301, when the quick connector 301 moves forwards continuously to a certain position, the reverse buckle 302 rebounds to be fastened with the pump locking boss 304 to ensure connection, and the quick connector 301 is sealed with the oil outlet nozzle 303 through an elastic sealing material 305. The oil inlet 400 of the nozzle 2 is provided with an oil inlet joint 306, and the oil inlet joint 306 is connected to the other end of the high-pressure oil pipe 300 in the same quick connection manner.

The above examples are only for illustrating the essence of the present invention, but not for limiting the present invention. Any modifications, simplifications, or other alternatives made without departing from the principles of the invention are intended to be included within the scope of the invention.

The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.

Claims (9)

1. A novel nozzle comprises a spraying part cavity, an oil inlet, a spraying valve and at least one spraying hole, wherein high-pressure fuel oil enters the spraying cavity from the oil inlet, the injection valve opens by pressure and comprises an injection valve spring, an injection valve seat and an injection valve member, characterized in that the injection valve comprises a valve stem, the injection valve member is located at one end of the valve stem, the other end of the valve stem is in contact with the injection valve spring, and a sealing member movably deformable with respect to the spouting portion chamber is provided on the valve stem, the sealing element divides the injection part cavity into an injection cavity and a spring chamber, the valve stem and the injection valve member are designed as one body, the injection valve spring is arranged in the spring chamber, the spring force of the injection valve spring acts on the valve rod, so that the injection valve member abuts against the injection valve seat, and the injection valve is in a closed state when not in operation.

2. The novel nozzle of claim 1 wherein said movably deformable sealing member is an elastomeric membrane such that the chamber and the spring chamber are two separate spaces, and said valve stem is movable by changing the deformation of the sealing member.

3. The novel nozzle of claim 1 wherein said movably deformable sealing member is a large end of a valve stem, the side walls of said large end of said valve stem forming a slip fit with the interior surface of said injection chamber thereby cutting off fluid communication between the injection chamber and the spring chamber.

4. A novel spray nozzle as claimed in claim 2 or claim 3 including a limiting seat mounted in the spring chamber for limiting the travel of the valve stem to control the opening height of the spray valve to ensure spray flow accuracy.

5. The novel nozzle as claimed in claim 4, including an adjustment ring disposed at one end of the injection valve spring, said injection valve varying the opening pressure by adjusting the height of the adjustment ring.

6. The novel nozzle as claimed in claim 5, including a filter disposed in said inlet opening leading to said spray chamber, said high pressure fuel being filtered through said filter and sprayed from said spray orifice.

7. An injection unit comprising a novel nozzle as claimed in any one of claims 1 to 5, including an electromagnetic force device, a plunger assembly including a plunger, a sleeve, an input valve and an output valve, the remaining volume between the plunger, the sleeve, the input valve and the output valve forming a pumping volume, the remaining volume between the electromagnetic force device and the plunger assembly forming a low pressure oil chamber, one of the plunger or the sleeve reciprocating relative to a stationary portion under the drive of the electromagnetic force device causing the pumping volume to change alternately in size to produce high pressure fuel, the oil inlet of the novel nozzle communicating with the output end of the pumping volume.

8. The spray unit of claim 7 wherein said novel spray nozzle includes a spring chamber flow passage communicating between the spring chamber and the low pressure oil chamber.

9. The spray unit of claim 7 including a high pressure oil line, said inlet port being connected to the output end of the pumping volume by the high pressure oil line.

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