Dual-fuel needle valve body matching part

Abstract

The utility model relates to the technical field of fuel injection of heat engines, and provides a dual-fuel needle valve body matching part which comprises a valve body and a needle valve rod, and the needle valve rod is arranged in the valve body; the valve body is provided with a gas-phase fuel flow channel, the needle valve rod is internally provided with a liquid-phase fuel flow channel, and the liquid-phase fuel flow channel and the gas-phase fuel flow channel are arranged in the height direction of the valve body and used for circulation of fuel; the needle valve rod is provided with a pressure balance hole, and the pressure balance hole penetrates through the liquid phase fuel flow channel and the gas phase fuel flow channel. The utility model has the effect of reducing the possibility of blockage in the matching part.

Description

Technical Field

[0001] The present application relates to the technical field of fuel injection of thermal engines, and in particular to a dual-fuel needle valve body pair. Background Art

[0002] The fuel nozzle is an important part of the heat engine. Its function is to inject fuel into the engine cylinder for mixed combustion, and drive the engine through the energy released by combustion. The atomization quality of the liquid fuel in the cylinder and the degree of mixing with the air in the cylinder are the main factors affecting the engine efficiency. The atomization effect of the liquid fuel in the cylinder and the degree of mixing with the air mainly depend on the nozzle body structure. Most of the existing nozzle structures are dual-fuel nozzles. Dual-fuel nozzles are nozzles with two fuel flow channels, liquid and gas, which can spray fuel into the combustion chamber in parallel or separately.

[0003] Patent No. 202220717751.5 discloses a single-valve-stem dual-fuel nozzle pair, including a needle valve body and a needle valve. The needle valve body is provided with a first fuel inlet channel, a second fuel inlet channel, and a cooling oil inlet / return channel. The tail of the needle valve body is provided with a positioning pin hole for installation. The needle valve is hollow in design and is installed in the valve cavity of the needle valve body. The head of the needle valve body and the head of the needle valve are both provided with fuel spray holes. By optimizing the layout of the fuel flow channel, dual-fuel injection of the single-valve-stem nozzle pair is realized, and the lubricity of the precision matching section of the nozzle pair is improved.

[0004] Regarding the above-mentioned related technologies, due to the long-term use of the pair, it is easy to cause a pressure difference between the two fuels, which may cause blockage inside the pair and affect the normal use of the nozzle, so there is room for improvement. Utility Model Content

[0005] In order to reduce the possibility of blockage inside the pair, the present application provides a dual-fuel needle valve body pair.

[0006] The dual-fuel needle valve body assembly provided in this application adopts the following technical solution:

[0007] A dual-fuel needle valve body pair, comprising a valve body and a needle valve stem, wherein the needle valve stem is arranged in the valve body; a gas phase fuel flow channel is opened on the valve body, and a liquid phase fuel flow channel is arranged in the needle valve stem, wherein the liquid phase fuel flow channel and the gas phase fuel flow channel are both arranged along the height direction of the valve body, and are used for the circulation of fuel respectively;

[0008] Wherein, a pressure balance hole is opened on the needle valve stem, and the pressure balance hole runs through the liquid-phase fuel flow channel and the gas-phase fuel flow channel.

[0009] By adopting the above technical solution, the liquid phase fuel flow channel is used for the circulation of liquid fuel, and the gas phase fuel flow channel is used for the circulation of gas fuel. By setting a pressure balance hole penetrating the liquid phase fuel flow channel and the gas phase fuel flow channel on the valve body, the pressure between the two is adjusted so that the gas pressure between the two is balanced, thereby reducing the probability of blockage.

[0010] Preferably, a buffer oil groove is further provided in the needle valve stem, the buffer oil groove is communicated with the liquid fuel flow channel, and is used for storing liquid fuel.

[0011] By adopting the above technical solution, the buffer oil tank can accommodate a certain amount of diesel, avoiding clogging of the entire nozzle pair due to excessive oil, and further reducing the possibility of clogging.

[0012] Preferably, an oil return groove and an oil return hole are respectively opened in the valve body, one end of the oil return groove is connected to the liquid fuel flow channel, and the other end is connected to the oil return hole, and the oil return hole is located above the liquid fuel flow channel.

[0013] By adopting the above technical solution, when there is too much oil in the liquid fuel flow channel, the staff can draw the oil into the oil return hole through the oil return groove, so that the staff can recycle the excess oil and reduce waste.

[0014] Preferably, an overflow hole is further provided on the valve body, the overflow hole is connected to the liquid fuel flow channel, and one end of the overflow hole connected to the liquid fuel flow channel is higher than one end of the oil return hole connected to the liquid fuel flow channel.

[0015] By adopting the above technical solution, when the oil is injected into the liquid fuel flow channel, when the oil is full, the oil will fill up the overflow hole, which is convenient for the staff to make judgments.

[0016] Preferably, a plurality of mounting holes are provided on the valve body, and the mounting holes are used for connection with external fasteners.

[0017] By adopting the above technical solution, the external fastener can be connected in the mounting hole to complete the fixation of the valve body.

[0018] Preferably, an oil inlet hole and an oil inlet channel are respectively provided on the valve body, two ends of the oil inlet channel are respectively connected to the oil inlet hole and the liquid-phase fuel flow channel, and the oil inlet hole is located above the liquid-phase fuel flow channel.

[0019] By adopting the above technical solution, the staff can inject liquid fuel into the oil inlet hole, and the liquid fuel flows along the oil inlet channel into the liquid-phase fuel flow channel.

[0020] Preferably, an air inlet hole and an air inlet channel are respectively provided on the valve body, two ends of the air inlet channel are respectively connected with the air inlet hole and the gas-phase fuel flow channel, and the air inlet hole is located above the gas-phase fuel flow channel.

[0021] By adopting the above technical solution, the staff can inject gas fuel into the air inlet hole, and the gas fuel flows along the air inlet channel into the gas phase fuel flow channel.

[0022] Preferably, a plurality of the air inlet channels are provided, each of the air inlet channels corresponds to one of the air inlet holes, and the air inlet channels are spaced apart along the circumference of the valve body.

[0023] By adopting the above technical solution, multiple intake channels can realize multi-point intake, improve the efficiency of intake, and at the same time improve the uniformity of gas distribution in the gas-phase fuel flow channel.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] (1) By setting a pressure balance hole, the pressure balance hole can adjust the pressure between the liquid fuel flow channel and the gas fuel flow channel so that the gas pressure between the two is balanced, thereby reducing the probability of blockage.

[0026] (2) By setting up a buffer oil tank, the buffer oil tank can hold a certain amount of diesel, avoiding the blockage of the entire nozzle assembly caused by excessive oil, thereby reducing the possibility of blockage.

[0027] (3) By setting up the oil return groove and the oil return hole, the staff can draw the oil into the oil return hole through the oil return groove so that the staff can recover the excess oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the needle valve body pair in the embodiment of the present application;

[0029] Figure 2 Schematic diagram of an explosion of a needle valve body assembly in an embodiment of the present application;

[0030] Figure 3 is a cross-sectional schematic diagram of the needle valve body assembly AA in the embodiment of the present application;

[0031] Figure 4 It is a cross-sectional schematic diagram of the needle valve body assembly BB in the embodiment of the present application.

[0032] Figure numerals: 1. Valve body; 2. Needle valve stem; 3. Gaseous fuel flow channel; 4. Liquid fuel flow channel; 5. Oil inlet hole; 6. Oil inlet channel; 7. Air inlet hole; 8. Air inlet channel; 9. Pressure balance hole; 10. Buffer oil tank; 11. Oil return tank; 12. Oil return hole; 13. Overflow hole; 14. Mounting hole. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The present application can be embodied in many different forms and is not limited to the embodiments described here.

[0034] In the description of the present application, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics represented can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection; it can also be a detachable connection; or integrated; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples shown in the present application.

[0038] The present application embodiment discloses a dual fuel needle valve body assembly. Figure 1 and Figure 2The needle valve body assembly includes a valve body 1 and a needle valve stem 2. The upper end of the valve body 1 is provided with a mounting hole 14. There are two mounting holes 14. The two mounting holes 14 are used for connecting external fasteners (such as fastening bolts) to achieve the fixation of the valve body 1. The needle valve stem 2 is fixedly installed in the valve body 1 and is connected to the valve body 1. Figure 3 The valve body 1 is provided with a gaseous fuel flow channel 3 for the circulation of gaseous fuel; the needle valve stem 2 is provided with a liquid fuel flow channel 4 for the circulation of liquid fuel (such as diesel). The liquid fuel flow channel 4 and the gaseous fuel flow channel 3 are both arranged along the height direction of the valve body 1, that is, the flow directions of the liquid fuel flow channel 4 and the gaseous fuel flow channel 3 are both from top to bottom. During use, the gaseous fuel assists the liquid fuel spray to break up, thereby improving the atomization quality of the liquid fuel in the engine cylinder, accelerating the mixing of the dual fuel and the air in the cylinder, and improving the combustion efficiency.

[0039] Specifically, the valve body 1 is provided with an oil inlet hole 5 and an oil inlet channel 6, respectively. The oil inlet hole 5 is located at the upper end of the valve body 1 and above the liquid fuel flow channel 4, and the two ends of the oil inlet channel 6 are connected to the oil inlet hole 5 and the liquid fuel flow channel 4 respectively. The staff can inject liquid fuel into the oil inlet hole 5, and the liquid fuel flows into the liquid fuel flow channel 4 along the oil inlet channel 6. In this embodiment, the number of the oil inlet hole 5 and the oil inlet channel 6 is two, one oil inlet hole 5 corresponds to one oil inlet channel 6, and the two oil inlet holes 5 are symmetrically distributed on the valve body 1. The two oil inlet holes 5 are used together for oil inlet, which improves the efficiency of oil inlet.

[0040] The valve body 1 is also provided with an air inlet hole 7 and an air inlet channel 8, respectively. The air inlet hole 7 is located at the upper end of the valve body 1 and is in the same plane as the oil inlet hole 5. The air inlet hole 7 is located above the gas-phase fuel flow channel 3, and the two ends of the air inlet channel 8 are connected to the air inlet hole 7 and the gas-phase fuel flow channel 3 respectively. Similarly, the staff can inject gas fuel into the air inlet hole 7, and the gas fuel flows into the gas-phase fuel flow channel 3 along the air inlet channel 8. In this embodiment, the number of air inlet holes 7 and air inlet channels 8 are both four, and each air inlet hole 7 corresponds to an air inlet channel 8, and the four air inlet holes 7 are distributed at intervals along the circumference of the valve body 1. Multiple air inlet channels 8 can realize multi-point air intake, thereby improving the efficiency of air intake.

[0041] Combination Figure 2 and Figure 4, wherein a pressure balance hole 9 is provided through the needle valve stem 2, and the pressure balance hole 9 connects the liquid fuel flow channel 4 and the gas fuel flow channel 3. The pressure balance hole 9 can adjust the pressure between the liquid fuel flow channel 4 and the gas fuel flow channel 3, so that the air pressure between the two is balanced, thereby reducing the probability of blockage. In addition, a cache oil tank 10 is also provided in the needle valve stem 2, and the cache oil tank 10 is connected to the liquid fuel flow channel 4 and is used to store liquid fuel. The cache oil tank 10 can accommodate a certain amount of diesel to avoid blockage of the entire nozzle pair when there is too much oil, further reducing the possibility of blockage.

[0042] In some embodiments, reference Figure 4 , an oil return groove 11 and an oil return hole 12 are respectively provided in the valve body 1, and the oil return groove 11 is used to connect the oil return hole 12 and the liquid fuel flow channel 4. The oil return hole 12 is located at the upper end of the valve body 1 and is located in the same plane as the oil inlet hole 5. When there is too much oil in the liquid fuel flow channel 4, the staff can draw the oil into the oil return hole 12 through the oil return groove 11, so that the staff can recycle the excess oil and reduce waste. In addition, an overflow hole 13 is also provided on the valve body 1. The overflow hole 13 and the oil return hole 12 are located in the same plane. The overflow hole 13 is connected to the liquid fuel flow channel 4, and the end of the overflow hole 13 connected to the liquid fuel flow channel 4 is higher than the end of the oil return hole 12 connected to the liquid fuel flow channel 4. When the staff injects oil into the liquid fuel flow channel 4, when the oil is full, the oil will fill the overflow hole 13, which is convenient for the staff to judge.

[0043] The implementation principle of a dual-fuel needle valve body pair in an embodiment of the present application is: by setting a pressure balance hole 9 that passes through the liquid fuel flow channel 4 and the gas fuel flow channel 3 on the valve body 1, the pressure between the two is adjusted to balance the air pressure between the two, thereby reducing the probability of blockage.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dual fuel needle valve body assembly, characterized in that: The valve body comprises a valve body (1) and a needle valve stem (2), wherein the needle valve stem (2) is arranged in the valve body (1); a gas phase fuel flow channel (3) is provided on the valve body (1), and a liquid phase fuel flow channel (4) is provided in the needle valve stem (2); the liquid phase fuel flow channel (4) and the gas phase fuel flow channel (3) are both arranged along the height direction of the valve body (1), and are respectively used for the circulation of fuel; A pressure balancing hole (9) is provided on the needle valve stem (2), and the pressure balancing hole (9) penetrates the liquid-phase fuel flow channel (4) and the gas-phase fuel flow channel (3).

2. A dual fuel needle valve body assembly according to claim 1, characterized in that: A buffer oil groove (10) is also provided in the needle valve stem (2); the buffer oil groove (10) is in communication with the liquid fuel flow channel (4) and is used to store liquid fuel.

3. A dual fuel needle valve body assembly according to claim 1, characterized in that: An oil return groove (11) and an oil return hole (12) are respectively provided in the valve body (1); one end of the oil return groove (11) is connected to the liquid-phase fuel flow channel (4), and the other end is connected to the oil return hole (12); the oil return hole (12) is located above the liquid-phase fuel flow channel (4).

4. A dual fuel needle valve body assembly according to claim 3, characterized in that: The valve body (1) is also provided with an overflow hole (13), the overflow hole (13) being in communication with the liquid-phase fuel flow channel (4), and one end of the overflow hole (13) connected to the liquid-phase fuel flow channel (4) being higher than one end of the oil return hole (12) connected to the liquid-phase fuel flow channel (4).

5. A dual fuel needle valve body assembly according to claim 1, characterized in that: The valve body (1) is provided with a plurality of mounting holes (14), and the mounting holes (14) are used for connection with external fasteners.

6. A dual fuel needle valve assembly according to claim 1, characterized in that: The valve body (1) is provided with an oil inlet hole (5) and an oil inlet channel (6), and two ends of the oil inlet channel (6) are respectively connected to the oil inlet hole (5) and the liquid-phase fuel flow channel (4), and the oil inlet hole (5) is located above the liquid-phase fuel flow channel (4).

7. A dual fuel needle valve body assembly according to claim 1, characterized in that: The valve body (1) is provided with an air inlet hole (7) and an air inlet channel (8), respectively; two ends of the air inlet channel (8) are connected to the air inlet hole (7) and the gas phase fuel flow channel (3), respectively; and the air inlet hole (7) is located above the gas phase fuel flow channel (3).

8. A dual fuel needle valve assembly according to claim 7, characterized in that: A plurality of the air inlet channels (8) are provided, each of the air inlet channels (8) corresponds to one of the air inlet holes (7), and the air inlet channels (8) are distributed at intervals along the circumference of the valve body (1).

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