Special high-pressure sheath for natural gas engine of commercial vehicle

Abstract

A high-pressure sheath special for a natural gas engine of a commercial vehicle comprises a high-pressure connecting rod made of plastic materials, a high-pressure sheath body made of Teflon materials and a cylinder head cover sealing cover made of silicone rubber materials, the high-pressure sheath body is connected to the lower end of the high-pressure connecting rod in a sleeved mode, and the cylinder head cover sealing cover is connected to the upper end of the high-pressure connecting rod in a sleeved mode. A high-pressure spring is installed in the high-pressure connecting rod and the high-pressure sheath in the longitudinal direction, the top end of the high-pressure spring is fixed to the upper end of the high-pressure connecting rod through a high-pressure connecting bolt, and a sheath sealing ring is installed in the high-pressure sheath and surrounds the periphery of the lower end of the high-pressure spring. The cylinder head cover sealing cover is provided with a labyrinth type exhaust path so that ionized gas in the spark plug well can be exhausted under the sealed condition. Product surface corrosion caused by corona discharge is effectively reduced, a labyrinth type exhaust route is adopted, it is guaranteed that ozone in a spark plug well can be discharged smoothly, relative sealing performance can be guaranteed, external moisture is prevented from immersing, and corrosion and insulation are prevented.

Description

Technical Field

[0001] The invention relates to a special high-pressure sheath for a natural gas engine of a commercial vehicle. Background Art

[0002] In the automobile engine ignition system, the ignition coil is an actuator that provides ignition energy for igniting the air and fuel mixture in the engine cylinder. It is a special pulse booster based on the principle of electromagnetic induction. It switches the low voltage of 8-32V at a set frequency to generate a 20-45KV voltage at the secondary side to generate electric sparks through the spark plug. The ignition coil based on natural gas engines has some differences in structure compared to traditional ignition coils. For example, the invention patent with publication number CN217008906 U discloses a natural gas ignition coil, including a coil head and a connecting rod part, the coil head includes a shell, a coil winding is arranged in the shell, the coil winding includes a primary coil, a secondary coil and an iron core, and the secondary coil surrounds the outside of the primary coil; a plug connector is arranged on one side of the shell, the plug connector is connected to the incoming end of the primary coil, an extension interface is arranged on a side of the shell perpendicular to the plug connector, and the connecting rod part is connected to the extension interface; a connecting terminal is arranged in the extension interface, an elastic component is arranged on the side of the connecting terminal close to the coil winding, and an inwardly bent spring sheet is relatively arranged on the base of the elastic component, an output pin is arranged on the secondary coil, and the output pin is inserted between the spring sheets; a spark plug is arranged at one end of the connecting rod part away from the coil head, and a high-voltage terminal connected to the connecting terminal and the spark plug is arranged in the connecting rod part.

[0003] Although the structure of this ignition coil is simple and easy to install, it cannot solve some problems caused by high energy density. For natural gas engines used in heavy trucks, it is necessary to ensure insulation between the spring and the spark plug well. The breakdown voltage of conventional gasoline engine spark plugs is between 15 and 30 kV, but the breakdown voltage of heavy truck natural gas engines is between 25 and 38 kV. In addition, the total length of the high-voltage sheath used in natural gas engines exceeds 180 mm. If only silicone rubber is used as the whole, it is very easy to bend and inconvenient to install. If the length of silicone rubber is shortened and the middle plastic connecting rod is connected, the plastic connecting rod has poor anti-corona ability. Long-term exposure to high temperature and high voltage environment will cause surface whitening, corrosion, and reduced voltage resistance. The most important thing is how to ensure the sealing of the exhaust process to prevent external moisture from penetrating. Summary of the invention

[0004] The purpose of the present invention is to provide a special high-pressure jacket for a commercial vehicle natural gas engine with a stable structure and good exhaust effect.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a high-pressure sheath specially used for a commercial vehicle natural gas engine, which is used to be installed between the high-pressure head of an ignition coil and a spark plug well, and comprises a high-pressure connecting rod made of a plastic material, a high-pressure sheath made of a Teflon material, and a cylinder head cover sealing cover made of a silicone rubber material, wherein the high-pressure sheath is sleeved on the lower end of the high-pressure connecting rod, and the cylinder head cover sealing cover is sleeved on the upper end of the high-pressure connecting rod, and a high-pressure spring is longitudinally installed in the high-pressure connecting rod and the high-pressure sheath, and the top end of the high-pressure spring is fixed to the upper end of the high-pressure connecting rod by a high-pressure connecting bolt, and a sheath sealing ring is installed in the high-pressure sheath, and the sheath sealing ring surrounds the lower end of the high-pressure spring, and a labyrinth exhaust route is arranged on the cylinder head cover sealing cover to discharge the ionized gas in the spark plug well under a sealed condition.

[0006] As a further improvement, the upper end of the high-voltage sheath forms an interconnection end, and the diameter of the lower portion of the high-voltage connecting rod is reduced so as to be integrally inserted into the interior of the interconnection end.

[0007] As a further improvement, the cylinder head cover sealing cover extends downward and wraps around the outside of the interconnected end of the high-voltage connecting rod and the high-voltage sheath.

[0008] As a further improvement, the cylinder head cover sealing cover includes an end cover, multiple concentric sealing rings formed below the end cover, and multiple concentric sealing rings formed on the upper surface of the end cover, a seal is formed between the concentric sealing rings and the spark plug well, and a seal is formed between the concentric sealing rings and the high-voltage head of the ignition coil.

[0009] As a further improvement, each of the sealing rings is provided with an overflow hole, and the overflow hole is configured to drive the ionized gas in the spark plug well to overflow layer by layer to the lower surface of the end cover.

[0010] As a further improvement, the intervals between adjacent overflow holes are large.

[0011] As a further improvement, the end cover is provided with a gas guide hole, and the gas guide hole is configured to drive the ionized gas on the lower surface of the end cover to be discharged into the sealing ring.

[0012] As a further improvement, the concentric sealing ring is provided with an exhaust hole, and the exhaust hole is configured to discharge the ionized gas in the sealing ring.

[0013] As a further improvement, the exhaust hole extends outward along the upper surface of the end cover.

[0014] As a further improvement, a gap is reserved between the lower end of the high-voltage sheath and the lower end of the sheath sealing ring.

[0015] Due to the adoption of the above technical scheme, the present invention has an outer (fully covered) silicone rubber and an internal supporting plastic connecting rod. The outer silicone rubber can effectively reduce the corona corrosion resistance, and the plastic connecting rod plays a supporting role in the overall strength of the sheath, effectively reducing the surface corrosion of the product caused by corona discharge, and can be used for a long time in a high temperature environment of 220°C; in addition, a labyrinth exhaust route is adopted to ensure that ozone in the spark plug well can be discharged smoothly and to ensure relative sealing, thereby preventing external moisture from penetrating and preventing corrosion and insulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 A cross-sectional view of a high-pressure jacket dedicated to a natural gas engine for a commercial vehicle according to the present invention; Attached Figure 2 An exploded view of a high-pressure jacket dedicated to a natural gas engine for a commercial vehicle according to the present invention; Attached Figure 3 The working principle of the high-pressure jacket dedicated to the natural gas engine of a commercial vehicle according to the present invention is shown in FIG. Figure 1 ; Attached Figure 4 The working principle of the high-pressure jacket dedicated to the natural gas engine of a commercial vehicle according to the present invention is shown in FIG. Figure 2 ; Attached Figure 5 This is a partial enlarged view of a high-pressure jacket dedicated to a natural gas engine for commercial vehicles according to the present invention. DETAILED DESCRIPTION

[0017] Hereinafter, the terms used in the specification will be briefly described, and the embodiments will be described in detail. All terms including descriptive terms or technical terms used herein should be interpreted as having meanings understood by those of ordinary skill in the art. However, these terms may have different meanings according to the intentions of those of ordinary skill in the art, precedents, or the emergence of new technologies.

[0018] In addition, some terms can be selected by the applicant, and in this case, the meaning of the selected terms will be described in detail in the detailed description of the embodiment. Therefore, the terms used herein must be defined based on the meaning of the terms together with the description in the entire specification. In addition, when a component "includes" or "contains" an element, unless there is a specific description to the contrary, the component may also include other elements without excluding other elements. In the following description, terms such as "component" and "module" indicate a unit for processing at least one function or operation, wherein the unit and module can be implemented as hardware or software or by combining hardware and software and implemented.

[0019] Embodiments will now be described more fully with reference to the accompanying drawings. However, embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the embodiments to those of ordinary skill in the art. In the following description, well-known functions or structures are not described in detail because they will obscure the embodiments with unnecessary details, and throughout the specification, the same reference numerals in the drawings represent the same or similar elements.

[0020] Attached Figure 1 2 is a cross-sectional view of a special high-pressure jacket for a commercial vehicle natural gas engine according to the present invention; Figure 2 : is an exploded view of a special high-pressure jacket for a commercial vehicle natural gas engine according to the present invention; the special high-pressure jacket for a commercial vehicle natural gas engine in this embodiment is used to be installed between the high-pressure head of the ignition coil and the spark plug well, and includes a high-pressure connecting rod 1 made of plastic material, a high-pressure jacket 2 made of Teflon material and a cylinder head cover sealing cover 3 made of silicone rubber material, the high-pressure jacket 2 is sleeved on the lower end of the high-pressure connecting rod 1, and the cylinder head cover sealing cover 3 is sleeved on the upper end of the high-pressure connecting rod 1. A high-pressure spring 4 is installed in the high-pressure connecting rod 1 and the high-pressure jacket 2 along the longitudinal direction. The top end of the compression spring 4 is fixed to the upper end of the high-voltage connecting rod 1 by a high-voltage connecting bolt 5. A sheath sealing ring 6 is installed in the high-voltage sheath 2. The sheath sealing ring 6 surrounds the lower end of the high-voltage spring 4. Since corona discharge can cause air ionization to produce ozone and nitrogen oxides (N0, N02) and other corrosive insulation, a labyrinth exhaust route is arranged on the cylinder head cover sealing cover 3 to discharge the ionized gas in the spark plug well under a sealed condition, thereby ensuring that the ozone in the spark plug well can be discharged smoothly and can ensure relative sealing to prevent external moisture from infiltrating.

[0021] The high-voltage sheath 2 is close to the spark plug components, so it is necessary to use a high-temperature resistant Teflon material that can be used for a long time in a high-temperature environment of 240°C. The upper end of the high-voltage sheath 2 forms an interconnection end 21, and the lower part of the high-voltage connecting rod 1 is reduced in diameter to be inserted into the interior of the interconnection end 21 as a whole.

[0022] The cylinder head cover sealing cover 3 extends downward and wraps around the outside of the interconnection end 21 of the high-voltage connecting rod 1 and the high-voltage sheath 2. This structure, which is fully covered with silicone rubber on the outside and has a built-in supporting plastic connecting rod, can effectively reduce the corona corrosion resistance. The plastic connecting rod supports the overall strength of the sheath and effectively reduces the surface corrosion of the product caused by corona discharge.

[0023] Attached Figure 3 The working principle of the high-pressure jacket dedicated to the natural gas engine of a commercial vehicle according to the present invention is shown in FIG. Figure 1 ; Attachment Figure 4 The working principle of the high-pressure jacket dedicated to the natural gas engine of a commercial vehicle according to the present invention is shown in FIG. Figure 2 The cylinder head cover sealing cover 3 includes an end cover 31, a plurality of concentric sealing rings 32 formed below the end cover 31, and a plurality of concentric sealing rings 33 formed on the upper surface of the end cover 31. When the high-pressure jacket dedicated to the commercial vehicle natural gas engine is inserted as a whole into the spark plug well shown in the figure, a seal is formed between the concentric sealing ring 32 and the spark plug well, and a seal is formed between the concentric sealing ring 33 and the high-pressure head of the ignition coil (not shown, located above the cylinder head cover sealing cover 3).

[0024] Each sealing ring 32 is provided with an overflow hole 34, and the intervals between adjacent overflow holes 34 are 180 degrees. The overflow holes 34 are configured to drive the ionized gas in the spark plug well to overflow to the lower surface of the end cover 31 layer by layer. The end cover 31 is provided with a gas guide hole 35, and the gas guide hole 35 is configured to drive the ionized gas on the lower surface of the end cover 31 to be discharged into the sealing ring 33. The gas guide hole 35 is located near the center of the end cover 31 and is an internal passage inclined outward. The concentric sealing ring 33 is provided with an exhaust hole 36, and the exhaust hole 36 extends outward along the upper surface of the end cover 31. The exhaust hole 36 is configured to discharge the ionized gas in the sealing ring 33. When ionized gas is generated in the spark plug well due to the high voltage used for spark plug ignition transmitted by the high-pressure spring, the high-temperature ionized gas will move upward, and thus will be discharged according to the attached Figure 3 As shown by the arrows in the figure, the water overflows layer by layer to the lower surface of the end cover 31, and then is guided into the sealing ring 33 through the air guide hole 35, and finally is discharged to the outside along the upper surface of the end cover 31 through the exhaust hole 36. The entire exhaust process is sealed, and external water vapor cannot enter in the reverse direction.

[0025] Attached Figure 5 This is a partial enlarged view of the high-pressure jacket for commercial vehicle natural gas engines according to the present invention. The jacket seal is tightly matched with the spark plug, so a gap D is reserved between the lower end of the high-pressure jacket 2 and the lower end of the jacket seal 6 to ensure the extrusion deformation extension margin when matching with the spark plug. Since the maximum temperature of the spark plug ceramic body (i.e., the sealing match with the jacket) can reach 200°C in the application of natural gas engines, the seal is made of special silicone rubber material, which can be used for a long time in a high temperature environment of 220°C.

[0026] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for the purpose of limitation. The description of the features or aspects within each implementation side should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope defined by the appended claims.

Claims

1. A high-voltage jacket for commercial vehicle natural gas engines, used to be installed between the high-voltage head of the ignition coil and the spark plug well, characterized in that: The invention comprises a high-voltage connecting rod (1) made of a plastic material, a high-voltage protective sleeve (2) made of a Teflon material, and a cylinder head cover sealing cover (3) made of a silicone rubber material, wherein the high-voltage protective sleeve (2) is sleeved on the lower end of the high-voltage connecting rod (1), and the cylinder head cover sealing cover (3) is sleeved on the upper end of the high-voltage connecting rod (1). A high-voltage spring (4) is longitudinally installed in the high-voltage connecting rod (1) and the high-voltage protective sleeve (2), and the top end of the high-voltage spring (4) is fixed to the upper end of the high-voltage connecting rod (1) by a high-voltage connecting bolt (5). A protective sleeve sealing ring (6) is installed in the high-voltage protective sleeve (2), and the protective sleeve sealing ring (6) surrounds the lower end of the high-voltage spring (4). The cylinder head cover sealing cover (3) is provided with a labyrinth exhaust route to discharge the ionized gas in the spark plug well under a sealed condition.

2. The high-pressure jacket for commercial vehicle natural gas engines according to claim 1 is characterized in that: The upper end of the high-voltage sheath (2) forms an interconnection end (21), and the lower portion of the high-voltage connecting rod (1) has a reduced diameter so as to be integrally inserted into the interior of the interconnection end (21).

3. The high-pressure jacket for commercial vehicle natural gas engines according to claim 2 is characterized in that: The cylinder head cover sealing cover (3) extends downward and wraps around the outside of the interconnecting end (21) of the high-voltage connecting rod (1) and the high-voltage sheath (2).

4. The high-pressure jacket for commercial vehicle natural gas engines according to claim 3 is characterized in that: The cylinder head cover sealing cover (3) comprises an end cover (31), a plurality of concentric sealing rings (32) formed below the end cover (31), and a plurality of concentric sealing rings (33) formed on the upper surface of the end cover (31), wherein a seal is formed between the concentric sealing rings (32) and the spark plug well, and a seal is formed between the concentric sealing rings (33) and the high-voltage head of the ignition coil.

5. The high-pressure jacket for commercial vehicle natural gas engines according to claim 4 is characterized in that: Each of the sealing rings (32) is provided with an overflow hole (34), and the overflow hole (34) is configured to drive the ionized gas in the spark plug well to overflow layer by layer to the lower surface of the end cover (31).

6. The high-pressure jacket for commercial vehicle natural gas engines according to claim 5, characterized in that: Adjacent overflow holes (34) are spaced 180 degrees apart.

7. The high-pressure jacket for commercial vehicle natural gas engines according to claim 4, characterized in that: The end cover (31) is provided with a gas guide hole (35), and the gas guide hole (35) is configured to drive the ionized gas on the lower surface of the end cover (31) to be discharged into the sealing ring (33).

8. The high-pressure jacket for commercial vehicle natural gas engines according to claim 4 is characterized in that: The concentric sealing ring (33) is provided with an exhaust hole (36), and the exhaust hole (36) is configured to exhaust ionized gas in the sealing ring (33).

9. The high-pressure jacket for commercial vehicle natural gas engines according to claim 8, characterized in that: The exhaust hole (36) extends outward along the upper surface of the end cover (31).

10. The high-pressure jacket for commercial vehicle natural gas engines according to claim 1, characterized in that: A gap is reserved between the lower end of the high-voltage sheath (2) and the lower end of the sheath sealing ring (6).

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