Oil nozzle

Abstract

The utility model belongs to the technical field of oil nozzles, and particularly discloses an oil nozzle which comprises a valve body and a needle valve installed in the valve body, a conical oil nozzle is arranged at the end of the valve body, the needle valve comprises a conical head used for being inserted into the oil nozzle, and the side wall of one end of the conical head abuts against the inner wall of the oil nozzle to form a sealing face. A pressure cavity used for storing oil is formed between the other end of the conical head and the inner wall of the oil spraying head, a plurality of oil spraying holes are formed in the side wall of the pressure cavity in the circumferential direction, included angles are formed between the axes of the oil spraying holes and the axis of the oil spraying head, and the included angles between the axes of the oil spraying holes and the axis of the oil spraying head are different; the conical head is detachably connected with a plurality of blocking pieces used for blocking the oil spraying holes. By the adoption of the scheme, the problems that after the fuel injection hole is opened, fuel needs to pass through the end of the needle valve and then move to the fuel injection hole, a certain time is needed in the process, and the fuel injection efficiency is affected can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel injection nozzles, and particularly relates to a fuel injection nozzle. Background Art

[0002] The fuel injector itself is a normally closed valve, controlled by the axial movement of a needle valve within the valve body. Once the needle valve opens the injection hole, fuel flows to the needle valve head and is ejected from the hole at high speed, forming a mist that promotes complete combustion. However, in actual operation, the needle valve movement takes time to open the injection hole. Once the injection hole is opened, the fuel needs to pass through the needle valve end and then move to the injection hole, a process that also takes time, affecting the efficiency of fuel injection. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention provides a fuel injector to solve the problem that after the fuel injection hole is opened, the fuel needs to pass through the end of the needle valve and then move to the fuel injection hole. This process also takes a certain amount of time, affecting the efficiency of fuel injection.

[0004] According to the embodiment of the present invention, the present invention adopts the following technical solutions:

[0005] The fuel injector includes a valve body and a needle valve installed in the valve body. A conical fuel injection head is provided at the end of the valve body. The needle valve includes a conical head for inserting into the fuel injection head. The side wall of one end of the conical head and the inner wall of the fuel injection head abut against each other to form a sealing surface. A pressure chamber for storing oil is formed between the other end of the conical head and the inner wall of the fuel injection head. A plurality of fuel injection holes are opened on the side wall of the pressure chamber along its circumference. The axis of the fuel injection hole and the axis of the fuel injection head have an angle, and the angles between the axes of the plurality of fuel injection holes and the axis of the fuel injection head are different. A plurality of baffles for blocking the fuel injection holes are detachably connected to the conical head.

[0006] Compared with the prior art, the present invention has the following beneficial effects:

[0007] 1. In this solution, a pressure chamber for storing fuel is provided between the conical head and the fuel injector. After fuel is sprayed once, some fuel remains in the pressure chamber. When the conical head no longer abuts against the inner wall of the fuel injector, the sealing surface is opened, and new fuel can enter the pressure chamber through the conical head. Since the pressure chamber contains residual fuel, the remaining fuel can be directly sprayed out by simply opening the fuel injection hole. Subsequent replenishment of fuel into the pressure chamber continues to be sprayed, thereby improving the efficiency of fuel spraying.

[0008] 2. The baffle design allows the cone to move with it, opening the fuel injection hole. This blocking action reduces the amount of residual fuel in the pressure chamber that drips directly through the nozzle, reducing fuel waste. Furthermore, as the baffle follows the cone's movement, fuel entering the pressure chamber and discharging will collide with the baffle, breaking it into smaller droplets and achieving better fuel atomization.

[0009] 3. Design multiple fuel injection holes with different angles between their axes and the axis of the injector head to increase the spray range. This is especially true during actual assembly, where the injector nozzles are often tilted at varying angles depending on the installation situation. By designing the fuel injection holes at multiple angles, the required fuel spray angles can be met in various installation environments (e.g., different nozzle assembly angles).

[0010] Furthermore, a sealing member for sealing the fuel injection hole is provided on the outer wall of the fuel injection head.

[0011] Furthermore, a first mounting cavity and a second mounting cavity are provided in the valve body, and the second mounting cavity is connected between the first mounting cavity and the oil injection head; an elastic member is installed in the first mounting cavity, and the elastic member is connected between the end of the needle valve and the inner wall of the first mounting cavity; the outer wall of the needle valve and the inner wall of the second mounting cavity do not contact and form an oil passage, and an oil inlet channel connected to the oil passage is also provided on the valve body.

[0012] Furthermore, a shaft shoulder is provided on the needle valve, and a pressure storage chamber is formed between the shaft shoulder and the inner wall of the second installation chamber, and the oil inlet channel is connected to the pressure storage chamber.

[0013] Furthermore, the oil injection hole includes a first section and a second section, the cross sections of the first section and the second section are both trapezoidal, and the small diameter ends of the first section and the second section are connected.

[0014] Furthermore, at least two fuel injection holes are provided along the busbar of the fuel injection head.

[0015] Furthermore, the free ends of the multiple fuel injection holes along the busbar direction of the fuel injection head are all oriented toward the free end of the fuel injection head, and the acute angle formed between the axis of the fuel injection hole and the axis of the fuel injection head gradually becomes smaller in the direction away from the free end of the fuel injection head to the direction close to the free end of the fuel injection head.

[0016] Furthermore, a connecting ring is detachably connected to the conical head, and the blocking pieces are all arranged on the connecting ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0018] Figure 2 for Figure 1 Enlarged view of part A.

[0019] In the figure: 1. Valve body; 2. Oil inlet channel; 3. Needle valve; 4. Spring; 5. Pressure accumulation chamber; 6. Oil injection head; 7. First installation chamber; 8. Second installation chamber; 9. Conical head; 10. Oil injection hole; 11. First section; 12. Second section; 13. Baffle; 14. Partition; 15. Connecting block; 16. Pressure chamber. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings, and specific implementation methods will be given.

[0021] like Figure 1 、 Figure 2 As shown, the fuel injector includes a valve body 1 and a needle valve 3 installed in the valve body 1. The valve body 1 is provided with a first installation cavity 7, a second installation cavity 8 and a fuel injection head 6 in sequence along its axial direction. The fuel injection head 6 is conical, and the small diameter end of the fuel injection head 6 is the free end of the valve body 1.

[0022] An elastic member is installed in the first mounting cavity 7, and the elastic member is connected between the end of the needle valve 3 and the inner wall of the first mounting cavity 7. Specifically, the elastic member is a spring 4, one end of the spring 4 is fixed to the inner wall of the first mounting cavity 7, and the other end of the spring 4 is fixed to a connecting block 15, and the longitudinal section of the connecting block 15 is T-shaped. An annular partition 14 is fixed between the first mounting cavity 7 and the second mounting cavity 8. The end of the connecting block 15 passes through the annular partition 14 and is detachably connected to the needle valve 3. Specifically, a conventional detachable connection method in the prior art such as bolt connection or clamping can be selected. With this design, the movement of the needle valve 3 toward the injector head 6 is limited by the connecting block 15.

[0023] The outer wall of the needle valve 3 and the inner wall of the second installation cavity 8 do not contact and form an oil passage. The valve body 1 is also provided with an oil inlet channel 2 connected to the oil passage. The needle valve 3 is provided with a shaft shoulder, and a pressure storage chamber 5 is formed between the shaft shoulder and the inner wall of the second installation cavity 8. The oil inlet channel 2 and the pressure storage chamber 5 are connected.

[0024] The needle valve 3 includes a conical head 9 for insertion into the fuel injector 6. The side wall of one end of the conical head 9 abuts against the inner wall of the fuel injector 6 to form a sealing surface. A pressure chamber 16 for storing oil is formed between the other end of the conical head 9 and the inner wall of the fuel injector 6. Specifically, the inner wall of the fuel injector 6 is provided with a first conical section and a second conical section. The taper of the first conical section is consistent with the taper of the conical head 9, so that the side wall of the conical head 9 can abut against the inner wall of the first conical section, and a pressure chamber 16 is formed between the second conical section and the end of the conical head 9. Fuel is introduced through the oil inlet channel 2 and enters the pressure accumulator chamber 5. When the amount of fuel in the pressure accumulator chamber 5 is large, the hydraulic pressure pushes the needle valve 3 toward the first mounting chamber 7. The conical head 9 no longer abuts against the inner wall of the fuel injector 6, allowing fuel to enter the pressure chamber 16.

[0025] The side wall of the pressure cavity 16 is provided with a plurality of oil injection holes 10 along the circumference thereof, the axes of the oil injection holes 10 and the axis of the oil injection head 6 have an included angle, and the included angles between the axes of the plurality of oil injection holes 10 and the axis of the oil injection head 6 are different, so as to increase the injection range of the oil injection holes 10, in the embodiment, the oil injection holes 10 are designed as conventional cylindrical holes, as shown in Figure 2 the right middle oil injection hole 10.

[0026] A plurality of baffles 13 for blocking the oil injection holes 10 are detachably connected to the conical head 9, specifically, a connecting ring is detachably connected to the conical head 9, and the baffles 13 are fixed or clamped on the connecting ring, the connecting ring is connected to the conical head 9 by means of detachable connection such as bolt connection or clamping, and the baffles 13 are detachably connected to the conical head 9, so as to facilitate the assembly and disassembly of the baffles 13 and the separate cleaning or replacement of the baffles 13 after disassembly. Through the design of the baffles 13, when the conical head 9 moves towards the first mounting cavity 7, the baffles 13 move to open the oil injection holes 10, and when the baffles 13 block the oil injection holes 10, the amount of fuel in the pressure cavity 16 directly dripping through the oil injection holes 10 is reduced, and the waste is reduced. In the actual design process, in order to reduce the hindering effect of the baffles 13 on the fuel injection, the cross section of the baffle 13 can be designed in a V shape, and the tip is aligned with the axis direction of the oil injection head 6, which has a certain guiding effect on the movement of the fuel through the baffle 13.

[0027] In another embodiment of the utility model, in the actual assembly process, the oil injection nozzle is assembled obliquely and the oblique angle is indefinite during installation, under different installation environments, that is, different assembly angles of the oil injection nozzle, in order to ensure that the fuel injection angle can meet the requirements, the multi-angle oil injection hole 10 is designed in the above embodiment, but in the actual use process, the fuel injection angle of part of the oil injection hole 10 is not suitable and will cause fuel waste, therefore, in the embodiment, the outer wall of the oil injection head 6 is provided with a closing piece for closing the oil injection hole 10, specifically, the closing piece can be a plug for directly plugging the oil injection hole 10, or the closing piece can be a welding material for directly filling the oil injection hole 10 on the outer wall of the oil injection head 6, as long as the unnecessary oil injection hole 10 is closed according to the use requirement, it is suitable for different installation environments, and the purpose of unified machining of the oil injection head 6 and then adjustment according to different installation environments can be realized, and the machining cost is reduced.

[0028] In another embodiment of the utility model, as shown in Figure 2 , as shown in Figure 2The fuel injection hole 10 on the middle left side includes a first section 11 and a second section 12. The cross-sections of the first section 11 and the second section 12 are both trapezoidal, and the small-diameter ends of the first section 11 and the second section 12 are connected. When the fuel flows through the first section 11 of the fuel injection hole 10, the inner diameter of the first section 11 gradually decreases, the fuel flow rate is accelerated, and the atomization effect is better. After the atomized fuel enters the second section 12 of the fuel injection hole 10, it can be sprayed outward in a wider range through the expansion of the second section 12, meeting the wide-range injection requirements.

[0029] In another embodiment of the present invention, at least two fuel injection holes 10 are provided along the generatrix of the fuel injector head 6. The free ends of the plurality of fuel injection holes 10 along the generatrix of the fuel injector head 6 all face the free end of the fuel injector head 6, and the acute angle formed between the axis of the fuel injection hole 10 and the axis of the fuel injector head 6 gradually decreases as it moves away from the free end of the fuel injector head 6 and toward the free end of the fuel injector head 6. By designing the number and angles of the fuel injection holes 10, the fuel injection range is expanded and overlap in the range of fuel sprayed by the plurality of adjacent fuel injection holes 10 along the generatrix of the fuel injector head 6 is reduced.

[0030] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Fuel injection nozzle, characterized by: The invention comprises a valve body and a needle valve installed in the valve body, a conical fuel injection head is provided at the end of the valve body, the needle valve comprises a conical head for inserting into the fuel injection head, the side wall of one end of the conical head and the inner wall of the fuel injection head abut against each other to form a sealing surface, a pressure chamber for storing oil is formed between the other end of the conical head and the inner wall of the fuel injection head, a plurality of fuel injection holes are provided on the side wall of the pressure chamber along its circumference, the axis of the fuel injection hole and the axis of the fuel injection head have an angle, and the angles between the axes of the plurality of fuel injection holes and the axis of the fuel injection head are different; a plurality of baffles for blocking the fuel injection holes are detachably connected to the conical head.

2. The fuel injector according to claim 1, characterized in that: The outer wall of the fuel injection head is provided with a sealing member for sealing the fuel injection hole.

3. The fuel injector according to claim 1, characterized in that: The valve body is provided with a first mounting cavity and a second mounting cavity, the second mounting cavity is connected between the first mounting cavity and the oil injection head; an elastic member is installed in the first mounting cavity, the elastic member is connected between the end of the needle valve and the inner wall of the first mounting cavity; the outer wall of the needle valve and the inner wall of the second mounting cavity do not contact and form an oil passage, and the valve body is also provided with an oil inlet channel connected to the oil passage.

4. The fuel injection nozzle according to claim 3, characterized in that: The needle valve is provided with a shaft shoulder, and a pressure storage chamber is formed between the shaft shoulder and the inner wall of the second installation chamber, and the oil inlet channel is communicated with the pressure storage chamber.

5. The fuel injection nozzle according to claim 1, characterized in that: The oil injection hole includes a first section and a second section. The cross sections of the first section and the second section are both trapezoidal, and the small-diameter ends of the first section and the second section are connected.

6. The fuel injection nozzle according to claim 1, characterized in that: At least two oil injection holes are provided along the busbar of the oil injection head.

7. The fuel injection nozzle according to claim 6, characterized in that: The free ends of the multiple fuel injection holes along the busbar direction of the fuel injection head are all oriented toward the free end of the fuel injection head, and the acute angle formed between the axis of the fuel injection hole and the axis of the fuel injection head gradually becomes smaller in the direction away from the free end of the fuel injection head to the direction close to the free end of the fuel injection head.

8. The fuel injection nozzle according to claim 1, characterized in that: The conical head is detachably connected to a connecting ring, and the baffles are all arranged on the connecting ring.

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