Magnetic isolation composite locking block structure

Abstract

The utility model provides a magnetic isolation composite locking block structure which ensures the magnetic isolation performance and the strength of the whole structure at the same time, so that a high-pressure common-rail electric oil injection system can stably and reliably work for a long time. The shell is made of high-carbon alloy steel and comprises a sleeve, external threads are arranged on the periphery of the sleeve, an inner concave ring cavity is formed in the top of the sleeve, and a through center guide hole is formed in the radial center position of the sleeve; the non-magnetic block is made of non-magnetic stainless steel, the non-magnetic block is profiled in the inner concave ring cavity to be of a ring structure, and a penetrating guide hole is formed in the center of the ring structure; and powdered copper; the non-magnetic block is plugged in the inner concave ring cavity, gaps between the bottom and the periphery of the non-magnetic block and the inner concave ring cavity are filled with the powder copper, then the non-magnetic block and the shell are welded into an integral structure through powder brazing, and the center guide hole and the penetrating guide hole form a communicating integral hole.

Description

Technical Field

[0001] This utility model relates to the technical field of electric fuel injector structure, specifically a magnetically shielded composite locking block structure. Background Technology

[0002] The high-pressure common rail electric fuel injection system uses an electric injector driven by electricity. Solenoid valve 1, through current circulation, controls the up-and-down sliding of armature 3. Armature 3 is linked to the lower hemispherical valve, thereby controlling the opening and closing of the oil passage inside the corresponding cavity of the injector body 2. The composite locking block 4 adjacent to armature 3 guides the movement of armature 3 and clamps the lower throttle valve 5 (see...). Figure 1 Meanwhile, the composite locking block 4 near the armature 3 needs to have non-magnetic properties to eliminate the influence on the reciprocating motion of the armature 3. However, the existing composite locking blocks 4 are all formed by fastening non-metallic parts and metal parts. In actual use, due to the presence of non-metallic parts, their strength is insufficient during long-term operation, which can easily lead to wear or damage. Therefore, it is urgent to develop a composite locking block with sufficient strength. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a magnetically shielded composite locking block structure, which ensures both magnetic shielding performance and overall structural strength, enabling the high-pressure common rail electric fuel injection system to operate stably and reliably for extended periods.

[0004] A magnetically shielded composite locking block structure, characterized in that it comprises:

[0005] The outer shell is made of high carbon alloy steel and includes a sleeve. The outer periphery of the sleeve is provided with external threads, the top of the sleeve is provided with an inner concave annular cavity, and a through central guide hole is opened at the radial center position of the sleeve.

[0006] The non-magnetic block is made of non-magnetic stainless steel and is made into a ring structure in the shape of the concave annular cavity. A through guide hole is provided at the center of the ring structure.

[0007] And powdered copper;

[0008] The non-magnetic block is inserted into the concave annular cavity. The gap between the bottom and outer periphery of the non-magnetic block and the concave annular cavity is filled with the powdered copper. Then, the non-magnetic block and the outer shell are welded into an integral structure by powder brazing. The central guide hole and the through guide hole form a connected integral hole.

[0009] Its further features are:

[0010] After the non-magnetic block and the outer shell are integrated by powder brazing, their upper surface is ground into a plane. The central guide hole and the through guide hole are ground again to remove residual powder copper.

[0011] The upper part of the through guide hole is provided with a guide cone surface, which makes the upper stop cone surface of the central column to which the armature is fixed reliably aligned with the guide cone surface, thereby reducing the wear of the armature and the non-magnetic block.

[0012] The upper circular surface of the integral mechanism formed by the non-magnetic block and the outer shell is provided with at least three auxiliary holes, which are through holes. The bottom of the outer shell is provided with an oblique hole, which connects to the middle section of the height direction of one of the auxiliary holes and the bottom of the central guide hole.

[0013] The combination of auxiliary holes allows the external thread of the overall mechanism to be threadedly connected to the injector body by driving the auxiliary holes to rotate during assembly. The combination of auxiliary holes and oblique holes also allows excess oil to be returned.

[0014] With this invention, the surface area of ​​the non-magnetic block covers the surface area of ​​the armature located on the upper layer, so the non-magnetic block will not affect the reciprocating motion of the armature due to magnetic conduction. The central post of the magnet is inserted into the integrated hole to guide the linear reciprocating motion of the armature. Since the outer shell is connected to the injector body through external thread, and then the bottom of the outer shell is pressed into the throttle valve block of the throttle valve, the entire composite locking block is a metal structure. The non-magnetic block and the outer shell are welded into an integral structure by powder brazing, which ensures the magnetic shielding performance and the strength of the entire structure, so that the high-pressure common rail electric fuel injection system can work stably and reliably for a long time. Attached Figure Description

[0015] Figure 1 A cross-sectional view of the assembly of the solenoid valve, armature, and composite locking block of an existing electric fuel injector;

[0016] Figure 2 The three-dimensional representation of this utility model Figure 1 ;

[0017] Figure 3 The three-dimensional representation of this utility model Figure 2 ;

[0018] Figure 4 This is a top view structural diagram of the present invention;

[0019] Figure 5 This is a cross-sectional view of the present invention.

[0020] The names corresponding to the serial numbers in the diagram are as follows:

[0021] 1. Solenoid valve; 2. Injector body; 3. Armature; 4. Composite locking block; 5. Throttle valve;

[0022] 10. Outer shell, 11. External thread, 12. Concave annular cavity, 13. Central guide hole, 20. Non-magnetic block, 21. Through guide hole, 22. Secondary guide cone surface, 30. Powdered copper, 40. Auxiliary hole, 50. Detailed Implementation

[0023] A magnetically shielded composite locking block structure, see Figures 2-5 It includes a shell 10, a non-magnetic block 20, and powdered copper 30;

[0024] The outer casing 10 is a sleeve made of high carbon alloy steel. The outer periphery of the sleeve is provided with external threads 11, the top of the sleeve is provided with an inner concave annular cavity 12, and a through central guide hole 13 is opened at the radial center of the sleeve.

[0025] The non-magnetic block 20 is a ring structure made of non-magnetic stainless steel, which is shaped like an inner concave ring cavity. A through guide hole 21 is provided in the center of the ring structure.

[0026] The non-magnetic block 20 is inserted into the concave annular cavity 12. The gap between the bottom, outer periphery and concave annular cavity 12 of the non-magnetic block 20 is filled with powdered copper 30. Then, the non-magnetic block 20 and the outer shell 10 are welded into an integral structure by powder brazing. The central guide hole 13 and the through guide hole 21 form a connected integral hole.

[0027] In practice, the non-magnetic block 20 is made of high-nickel alloy. Since the melting point of copper is much lower than that of steel, powdered copper 30 is used as a medium to braze the non-magnetic block 20 and the outer shell 10.

[0028] After the non-magnetic block 20 and the outer shell 10 are integrated by powder brazing, their upper surface is ground into a plane, and the central guide hole 13 and the through guide hole 21 are ground again to remove residual powder copper.

[0029] The outer periphery of the through guide hole 21 is machined to form a secondary guide cone surface 22, which ensures that the upper stop cone surface of the central column to which the armature 3 is fixed is reliably aligned with the secondary guide cone surface 22, thereby reducing the wear of the armature 3 and the non-magnetic block 20.

[0030] The upper circular surface of the integral mechanism formed by the non-magnetic block 20 and the outer shell 10 is provided with three auxiliary holes 40. The auxiliary holes 40 are through holes. The bottom of the outer shell 10 is provided with an oblique hole 50, which connects to the middle section of the height direction of one of the auxiliary holes 40 and the bottom of the central guide hole 13.

[0031] The combination of auxiliary holes 40 allows the auxiliary holes to rotate during assembly by the lower protrusion of the mounting plate, which drives the external thread 11 of the overall mechanism and the injector body 2 to form a threaded connection. The combination of auxiliary holes 40 and oblique holes 50 allows excess oil to return to the system.

[0032] Its working principle is as follows: The surface area of ​​the non-magnetic block covers the surface area of ​​the armature located on the upper layer, so the non-magnetic block will not affect the reciprocating motion of the armature due to magnetic conduction. The central post of the magnet is inserted into the integrated hole to guide the linear reciprocating motion of the armature. Since the outer shell is connected to the injector body through external thread, and then the bottom of the outer shell is pressed into the throttle valve block of the throttle valve, the entire composite locking block is a metal structure. The non-magnetic block and the outer shell are welded into an integral structure by powder brazing, which ensures the magnetic shielding performance and the strength of the entire structure, so that the high-pressure common rail electric fuel injection system can work stably and reliably for a long time.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetically shielded composite locking block structure, characterized in that, It includes: The outer shell is made of high carbon alloy steel and includes a sleeve. The outer periphery of the sleeve is provided with external threads, the top of the sleeve is provided with an inner concave annular cavity, and a through central guide hole is opened at the radial center position of the sleeve. The non-magnetic block is made of non-magnetic stainless steel and is made into a circular structure in the shape of the concave annular cavity. A through guide hole is provided in the center of the circular structure. And powdered copper; The non-magnetic block is inserted into the concave annular cavity. The gap between the bottom and outer periphery of the non-magnetic block and the concave annular cavity is filled with the powdered copper. Then, the non-magnetic block and the outer shell are welded into an integral structure by powder brazing. The central guide hole and the through guide hole form a connected integral hole.

2. The magnetically shielded composite locking block structure according to claim 1, characterized in that: After the non-magnetic block and the outer shell are integrated by powder brazing, their upper surface is ground into a plane. The central guide hole and the through guide hole are ground again to remove residual powder copper.

3. The magnetically shielded composite locking block structure according to claim 1, characterized in that: A guide cone surface is provided at the upper part of the through guide hole.

4. The magnetically shielded composite locking block structure according to claim 1, characterized in that: The upper circular surface of the integral mechanism formed by the non-magnetic block and the outer shell is provided with at least three auxiliary holes, which are through holes. The bottom of the outer shell is provided with an oblique hole, which connects to the middle section of the height direction of one of the auxiliary holes and the bottom of the central guide hole.

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