Valve element of oil sprayer

Abstract

The utility model relates to a valve element of an oil sprayer. The valve element comprises a connecting section and a transition section fixedly connected with the connecting section. A conical sealing groove coaxial with the fixing hole is formed in the connecting section and located between the fixing hole and the oil passing hole. A spherical containing hole is formed in the end of the transition section, and the containing hole and the oil passing hole are coaxially formed. An inclined surface is arranged on the outer surface of the end part of the transition section and is adjacent to the accommodating hole. A conical sealing ring is mounted in the conical sealing groove; compared with a flat sealing ring, the conical sealing ring is higher in pressure bearing capacity and better in sealing effect. And meanwhile, the cutting inclined surface is arranged on the outer surface of the transition section, so that the connection between a welding seam generated in the welding process of laser beam welding and the transition section is smoother. Therefore, in the using process, the phenomenon that fuel oil is mixed and disordered when flowing through the step between the steel ball and the transition section is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injectors, in particular to a valve core of a fuel injector. Background Art

[0002] The function of the fuel injector is to change a certain amount of fuel from liquid to mist, and then mix it with air. The electronically controlled fuel injector includes axle needle type electromagnetic fuel injector, ball valve type electromagnetic fuel injector, plate valve type electromagnetic fuel injector, etc. The ball valve type electromagnetic fuel injector usually includes a valve body, a coil, a spring, a needle valve, a valve seat, a spray hole plate, etc. The needle valve is welded into a whole by a steel ball, a valve core and an armature with a laser beam (such as Figure 3 As shown). When the coil is energized, magnetic force is generated. The needle valve moves under the action of the magnetic force, and the steel ball on the needle valve separates from the valve seat, so that the high-pressure fuel is sprayed out through the spray hole plate on the valve seat. When the coil is de-energized, the magnetic force disappears, and the needle valve moves under the action of the spring, so that the steel ball on the needle valve abuts against the valve seat. The high-pressure fuel cannot be sprayed out through the spray hole plate on the valve seat. In order to achieve the connection between the valve core and the external oil source, an oil pipe is inserted into the valve core, and the oil pipe passes through the armature to connect with the external oil source. The oil pipe and the valve core are sealed by a flat sealing ring. A sealing groove that matches the flat sealing ring is machined inside the valve core. At the same time, after the steel ball is welded to the end face of the valve core, a step will be formed between the steel ball and the valve core. When the fuel passes through the step, it will be mixed and turbulent, thereby reducing the flow rate of the fuel. Utility Model Content

[0003] The utility model aims to provide a valve core of a fuel injector, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a valve core of an injector, comprising a connecting section and a transition section fixedly connected to the connecting section; a conical sealing groove coaxially arranged with a fixing hole is arranged in the connecting section, and the sealing groove is located between the fixing hole and the oil passage hole; a spherical accommodating hole is arranged at the end of the transition section, and the accommodating hole is coaxially arranged with the oil passage hole; an inclined surface is arranged on the outer surface of the end of the transition section, and the inclined surface is adjacent to the accommodating hole.

[0005] Compared with the prior art, a conical sealing ring is installed in the conical sealing groove; the conical sealing ring has a higher pressure bearing capacity and a better sealing effect than a flat sealing ring. At the same time, a bevel is provided on the outer surface of the transition section, so that the connection between the weld produced during the laser beam welding and the transition section is smoother. Therefore, during use, the fuel (gasoline / diesel) is prevented from being mixed and disordered when flowing through the step between the steel ball and the transition section.

[0006] As an improvement to the valve core of the fuel injector of the utility model, the connection between the accommodating hole and the oil passing hole is transitionally connected via an arc segment.

[0007] As an improvement of the valve core of the fuel injector of the utility model, the diameter of the transition section is smaller than the diameter of the connecting section.

[0008] As an improvement of the valve core of the fuel injector of the utility model, the diameter of the oil passage hole is smaller than the diameter of the fixed hole.

[0009] As an improvement of the valve core of the fuel injector of the utility model, two connecting holes which are connected to the oil through hole are fixedly arranged on the transition section; the two connecting holes are symmetrically arranged on the transition section.

[0010] As an improvement to the valve core of the fuel injector of the utility model, the axis of the connecting hole and the axis of the oil passage hole are arranged perpendicular to each other.

[0011] As an improvement to the valve core of the fuel injector of the utility model, the connection between the accommodating hole and the oil passing hole is transitionally connected via an arc segment.

[0012] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the advantages brought by the technical features of the technical solution described above, other technical problems that can be solved by the present invention, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the utility model.

[0014] Figure 2 It is an enlarged view of point A of the present utility model.

[0015] Figure 3 It is an assembly diagram of the utility model.

[0016] Explanation of the accompanying figures: 01. Connecting section, 02. Transition section, 03. Fixing hole, 04. Oil hole, 05. Conical sealing groove, 06. Connecting hole, 07. Accommodating hole, 08. Arc section, 09. Inclined surface. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] like Figure 1-3As shown, a valve core of a fuel injector of the utility model is connected to a steel ball at one end and to an armature at the other end. The steel ball, the valve core and the armature are welded into a whole by laser beam, and include a connecting section 01 and a transition section 02 integrally formed with the connecting section 01. The diameter of the transition section 02 is smaller than the diameter of the connecting section 01, so that a chamber for containing fuel (gasoline / diesel) is formed between the outer circumferential surface of the transition section 02 and the fuel injector housing. A fixing hole 03 is arranged inside the connecting section 01, and an oil-passing hole 04 coaxially arranged with the fixing hole 03 is arranged on the transition section 02, and the diameter of the oil-passing hole 04 is smaller than the diameter of the fixing hole 03. At the same time, a conical sealing groove 05 coaxially arranged with the fixing hole 03 is arranged inside the connecting section 01, and the sealing groove is located between the fixing hole 03 and the oil-passing hole 04.

[0019] During use, the connecting section 01 needs to be fixedly connected with the hollow armature by laser beam welding, and the oil pipe is passed through the fixed hole 03, and then the electromagnetic coil in the injector cooperates with the armature. The entire valve core is driven to move back and forth in the injector, so a conical sealing groove 05 is set at the bottom of the fixed hole 03. At the same time, a conical sealing ring is set in the conical sealing groove 05. The conical sealing ring is sleeved on the oil pipe. Since the diameter of the oil hole 04 is smaller than the diameter of the fixed hole 03, a mounting surface is formed at the connection between the oil hole 04 and the fixed hole 03. After the conical sealing ring is installed in the conical sealing groove 05, the conical sealing ring is abutted against the mounting surface, so that the conical sealing ring is clamped in the conical sealing groove 05. The setting of the conical sealing ring prevents fuel (gasoline / diesel) from entering the armature from the gap between the oil pipe and the fixed hole 03 to cause damage to it. Thereby improving the service life of the armature. At the same time, a conical sealing ring is installed in the conical sealing groove 05. Compared with the flat sealing ring, the conical sealing ring has a higher pressure bearing capacity and a better sealing effect. From the perspective of the processing tool, the tool (inner groove tool) used to process the flat sealing groove in the fixed hole 03 and the tool (inner boring tool) used to process the conical sealing groove 05 in the fixed hole 03 are more expensive. From the perspective of the processing path, the route of the inner boring tool when processing the conical sealing groove 05 is an oblique line. When processing the flat sealing groove, the route of the inner groove tool is a reciprocating straight line. Therefore, the route of the inner boring tool and the time required for processing the conical sealing groove 05 are shorter.

[0020] Two connecting holes 06 are fixedly provided on the transition section 02 and are connected to the oil hole 04. The two connecting holes 06 are symmetrically arranged on the transition section 02. The design of the connecting holes 06 facilitates the fuel (gasoline / diesel) to flow out of the oil hole 04 or allows the fuel (gasoline / diesel) outside the transition section 02 to enter the oil hole 04 through the connecting holes 06. The axis of the connecting hole 06 and the axis of the oil hole 04 are arranged perpendicular to each other. A spherical receiving hole 07 is provided at the end of the transition section 02, and the receiving hole 07 is coaxially arranged with the oil hole 04. The connection between the receiving hole 07 and the oil hole 04 is transitionally connected by a circular arc section 08. An inclined surface 09 is provided on the outer surface of the end of the transition section 02, and the inclined surface 09 is adjacent to the receiving hole 07. The design of the inclined surface 09 reduces the thickness from the outer edge of the transition section 02 to the receiving hole 07.

[0021] During use, it is necessary to place a steel ball in the receiving hole 07, and fix the steel ball and the transition section 02 as a whole by laser beam welding. Since the receiving hole 07 is spherical. Placing the steel ball in the receiving hole 07 makes the steel ball fit more closely with the receiving hole 07, and it is convenient to place the steel ball. A bevel is provided on the outer surface of the transition section 02, and the connection between the weld produced during the laser beam welding and the transition section 02 is smoother. Therefore, during use, it is avoided that the fuel (gasoline / diesel) flows through the step between the steel ball and the transition section 02 and becomes mixed and disordered. Thereby increasing the flow rate of the fuel. When adding the inclined surface 09, the receiving hole 07 is first processed, and then the size of the weld at the welding point between the steel ball and the end face of the transition section 02 is determined. The inclination angle of the bevel 09 and the length of the inclined surface 09 along the axis direction of the transition section 02 are determined.

[0022] At the same time, the arc segment 08 is passed through the connection between the receiving hole 07 and the oil hole 04. The design of the arc segment 08 and the design of the inclined surface 09 are used to avoid the mixing and disorder of the fuel (gasoline / diesel) in the oil hole 04.

[0023] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A valve core of a fuel injector, comprising a connecting section and a transition section fixedly connected to the connecting section; characterized in that: A conical sealing groove coaxially arranged with the fixing hole is arranged in the connecting section, and the sealing groove is located between the fixing hole and the oil hole; a spherical accommodating hole is arranged at the end of the transition section, and the accommodating hole is coaxially arranged with the oil hole; an inclined surface is arranged on the outer surface of the end of the transition section, and the inclined surface is adjacent to the accommodating hole.

2. The valve core of the fuel injector according to claim 1, characterized in that: The connection between the receiving hole and the oil passage hole is connected by a transition of a circular arc segment.

3. The valve core of the fuel injector according to claim 1, characterized in that: The diameter of the transition section is smaller than the diameter of the connecting section.

4. The valve core of the fuel injector according to claim 1, characterized in that: The diameter of the oil hole is smaller than the diameter of the fixing hole.

5. The valve core of the fuel injector according to claim 1, characterized in that: Two connecting holes which are connected to the oil-passing holes are fixedly arranged on the transition section; the two connecting holes are symmetrically arranged on the transition section.

6. The valve core of the fuel injector according to claim 5, characterized in that: The axis of the connecting hole and the axis of the oil passage hole are arranged perpendicular to each other.

7. The valve core of the fuel injector according to claim 1, characterized in that: The connection between the receiving hole and the oil passage hole is connected by a transition of a circular arc segment.

Images