A permanent magnet rail pressure control valve for common rail system

Abstract

The present invention discloses a permanent magnet rail pressure control valve for a common rail system. The permanent magnet rail pressure control valve mainly consists of an electromagnetic control chamber and a mechanical sealing chamber. Two permanent magnet material rings with an appropriate distance are arranged in the structure. Through the attraction of the two permanent magnet material rings, the mechanical sealing chamber is subjected to a corresponding force and is in a sealed state. The rail pressure control valve can maintain a certain initial pressure, which not only increases the maximum sealing capacity of the rail pressure control valve, but also enables the common rail system to have a limp home function. At the same time, the permanent magnet rail pressure control valve can reduce the volume of current products of this type on the market, reduce material costs, effectively reduce power consumption, and increase the service life of the rail pressure control valve. The invention has broad development prospects.

Description

Technical Field

[0001] The present invention relates to a rail pressure control valve in a high-pressure common rail system of a diesel engine, and in particular to a permanent magnet rail pressure control valve for the common rail system. Background Art

[0002] The use of high-pressure common rail fuel injection systems in diesel engines has become one of the major development trends in diesel engine technology worldwide and an important means of reducing pollutant emissions from diesel engines. High-pressure common rail fuel injection systems enable stable, high-pressure injection and a comprehensive combustion process. They also independently control injection characteristics, significantly improving diesel engine power, economy, and emissions. High-pressure common rail systems require more stable rail pressure, so the rail pressure control valve has a significant impact on the performance of the common rail pump and is a key component in improving its performance.

[0003] In the prior art, in order to maintain a high pressure during operation of the common rail system, the rail pressure control valve armature requires a large electromagnetic force to ensure the sealing ability of the sealing surface. The rail pressure control valve is subject to restrictions such as the number of coil turns, valve volume, installation space, and the magnetic properties of the soft magnetic material, resulting in certain limitations in its sealing ability. Furthermore, the rail pressure control valve is exposed to high current and high temperature environments for extended periods, significantly reducing its service life. The present invention utilizes permanent magnet materials to design a new solenoid valve structure that can increase the electromagnetic force of the armature while reducing the number of coil turns required, reducing the volume of the solenoid valve, significantly reducing the operating power consumption of the solenoid valve, and increasing the service life of the solenoid valve. This present invention has broad development prospects. Summary of the Invention

[0004] The present invention aims to provide a permanent magnet rail pressure control valve for a common rail system, so as to reduce the volume of the rail pressure control valve, reduce the power consumption of the rail pressure control valve, and increase the service life of the rail pressure control valve.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a permanent magnet rail pressure control valve for a common rail system, comprising: an electromagnetic control chamber and a mechanical sealing chamber;

[0006] The electromagnetic control chamber includes: a shell, a coil component, a front yoke sleeve, a rear yoke sleeve, a guide sleeve, a cover plate and an armature component; the coil component is freely placed and seated downward along the inner wall of the shell, and the cover plate is placed vertically along the inner wall of the shell and fits with the coil component; the rear yoke sleeve and the guide sleeve are arranged in the shell, and the rear yoke sleeve is placed above the guide sleeve, and is fixed after being interference pressed into the guide sleeve; the armature component is arranged in the rear yoke sleeve and the guide sleeve, and is located above the front yoke sleeve. The armature component is built with an armature permanent magnetic material ring, and the front yoke sleeve is built with a front yoke sleeve permanent magnetic material ring. The long end of the armature component is inserted into the center hole of the front yoke sleeve along the center hole and extends into the mechanical control chamber, and is seated after the armature permanent magnetic material ring and the front yoke sleeve permanent magnetic material ring are freely attracted. The front yoke sleeve is locked by interference fit and is vertically pressed into the guide sleeve and fixed. The armature component moves under the combined action of electromagnetic force and permanent magnet attraction, thereby forming different openings to achieve the purpose of controlling flow.

[0007] Furthermore, the armature permanent magnet material ring is pressed into the groove of the armature component by interference until it is flush with the lower surface of the armature component.

[0008] Furthermore, the permanent magnetic material ring of the front yoke sleeve is vertically pressed into the groove of the front yoke sleeve by interference fit until it is flush with the upper surface of the front yoke sleeve.

[0009] Furthermore, the distance between the permanent magnetic material ring of the armature and the permanent magnetic material ring of the front yoke sleeve can ensure that when the rail pressure control valve is powered off, the armature component and the front yoke sleeve still have appropriate attraction, so that the mechanical sealing chamber is sealed.

[0010] Furthermore, the distance between the armature permanent magnetic material ring and the front yoke sleeve permanent magnetic material ring is 0.5 to 30 wires.

[0011] Furthermore, the housing, the coil component, and the cover plate are formed into an integral component through a riveting process.

[0012] Furthermore, the front yoke sleeve and the guide sleeve are fixed by laser welding.

[0013] Furthermore, the rear yoke sleeve and the guide sleeve are fixed by laser welding.

[0014] Furthermore, the armature permanent magnetic material ring and the front yoke sleeve permanent magnetic material ring are both annular structures.

[0015] Furthermore, the front yoke sleeve, the rear yoke sleeve and the armature component are made of easy-to-cut soft magnetic metal material, and cobalt and nickel elements are added to the material.

[0016] The permanent magnet rail pressure control valve for the common rail system of the present invention has the following advantages:

[0017] 1. Due to the attraction of the two permanent magnetic rings, the mechanical seal chamber is subjected to the corresponding force and is in a sealed state. The rail pressure control valve can maintain a certain initial pressure, so that the common rail system has a limp function.

[0018] 2. When the solenoid valve coil is energized, the permanent magnetic material ring as the iron core can increase the magnetic field strength generated by the coil. The armature is subjected to a greater electromagnetic force, which in turn causes the mechanical sealing chamber to be subjected to a greater electromagnetic force, thereby increasing the maximum sealing capacity of the rail pressure control valve. This increases the sealing pressure of this type of product currently on the market while reducing the volume and material cost.

[0019] 3. When the rail pressure control valve reaches the target control rail pressure, the number of turns of the coil component required is reduced, the volume is reduced, and the current required by the coil can be reduced at the same time, which can effectively reduce power consumption and increase the service life of the rail pressure control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the permanent magnet rail pressure control valve used in the common rail system.

[0021] Among them: 1-electromagnetic control chamber; 2-mechanical seal chamber; 3-coil component; 4-armature; 5-rear yoke sleeve; 6-cover plate; 7-housing; 8-front yoke sleeve; 9-armature permanent magnetic material ring; 10-front yoke sleeve permanent magnetic material ring; 11-guide sleeve.

[0022] Figure 2 This is a schematic diagram of the permanent magnet material ring assembly structure of the front yoke sleeve of the permanent magnet rail pressure control valve

[0023] Among them: 8-front yoke sleeve; 10-front yoke sleeve permanent magnetic material ring;

[0024] Figure 3 This is a schematic diagram of the permanent magnet material ring assembly structure of the permanent magnet rail pressure control valve armature component

[0025] Among them: 4-armature component; 9-armature permanent magnetic material ring; DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0027] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0028] A permanent magnet rail pressure control valve for a common rail system, such as Figure 1 As shown, it includes: an electromagnetic control chamber 1 and a mechanical seal chamber 2; wherein the electromagnetic control chamber includes: a shell 7, a coil component 3, a front yoke sleeve 8, a rear yoke sleeve 5, a guide sleeve 11, a cover plate 6 and an armature component 4. The front yoke sleeve 8 is vertically pressed into the guide sleeve 11 by interference fit locking and is fixed by laser welding. The groove of the front yoke sleeve 8 is vertically pressed into the front yoke sleeve permanent magnetic material ring 10 by interference fit until the surface is flush. The armature permanent magnetic material ring 9 is interference fit pressed into the groove of the armature component 4 until the surface is flush. The long end of the armature component 4 is inserted into the center hole of the front yoke sleeve 8 along the center hole, and the armature permanent magnetic material ring 9 and the front yoke sleeve permanent magnetic material ring 10 are freely attracted and then seated.

[0029] The distance between the armature permanent magnet ring and the front yoke permanent magnet ring ensures that the armature assembly and the front yoke retain a suitable attractive force when the rail pressure control valve is powered off, sealing the mechanical seal chamber. The required initial sealing pressure can be calculated using the formula: F = μ0 / [4S(H / δ)^2], where F is the required initial sealing pressure, μ0 is the vacuum magnetic permeability, H is the permanent magnet magnetomotive force, S is the permanent magnet surface area, and δ is the distance between the armature permanent magnet ring and the front yoke permanent magnet ring. The distance between the permanent magnet rings can be calculated based on the required initial sealing pressure for each system. In rail pressure control valves, this distance is generally controlled between 0.5 and 30 mm.

[0030] The rear yoke sleeve 5 is placed above the guide sleeve 11, and is fixed by laser welding after being interference pressed into the guide sleeve 11. The coil component 3 is freely placed and seated downward along the inner wall of the shell 7, and the cover plate 6 is placed vertically along the inner wall of the shell and fits with the coil component 3. The coil component 3, the cover plate 6, the rear yoke sleeve 5 and the guide sleeve 11 are arranged in the shell, and the shell 7, the coil component 3 and the cover plate 6 are formed into an integral component through a riveting process. The armature component 4 is arranged in the rear yoke sleeve 5 and the guide sleeve 11, and moves axially under the action of the closed magnetic circuit. One end (lower end) of the armature component 4 extends into the mechanical control room through the center hole of the front yoke sleeve, and moves under the combined action of the electromagnetic force and the attraction of the permanent magnet, thereby forming different openings to achieve the purpose of controlling the flow rate.

[0031] In particular, the front yoke sleeve, rear yoke sleeve, and armature component are made of a soft magnetic material that is easy to process and easy to cut. In order to improve the magnetic permeability of the material and reduce the coercive force, appropriate amounts of cobalt and nickel elements are added to the material to enhance its electromagnetic properties, thereby enabling the rail pressure control valve to achieve a higher sealing pressure.

[0032] In particular, the armature component 4 has an armature permanent magnetic material ring 9 built in. The permanent magnetic material ring is annular in structure and is embedded into the electromagnetic control chamber from the lower surface of the armature component 4 .

[0033] In particular, the front yoke sleeve 8 has a built-in front yoke sleeve permanent magnetic material ring 10. The permanent magnetic material ring is annular and is embedded into the electromagnetic control chamber from the upper surface of the front yoke sleeve 8. Figure 2 As shown,.

[0034] Specifically, the armature permanent magnet ring 9 and the front yoke permanent magnet ring 10 are set at a specific distance to achieve an appropriate electromagnetic force, ensuring that even when the rail pressure control valve is powered off, the armature component 4 and the front yoke 8 maintain an attractive force. When the rail pressure control valve is powered off, the armature 4 is subjected to a vertical downward electromagnetic force due to the attraction between the opposite poles of the permanent magnet rings, maintaining a certain initial pressure. This initial sealing pressure can be adjusted according to system requirements by controlling the distance between the armature permanent magnet ring 9 and the front yoke permanent magnet ring 10.

[0035] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A permanent magnet rail pressure control valve for a common rail system, characterized in that include: Electromagnetic control room and mechanical seal room; The electromagnetic control chamber comprises: a housing, a coil component, a front yoke sleeve, a rear yoke sleeve, a guide sleeve, a cover plate and an armature component; The coil component is freely placed and seated downward along the inner wall of the shell, and the cover plate is placed vertically along the inner wall of the shell and fits with the coil component; the rear yoke sleeve and the guide sleeve are arranged in the shell, and the rear yoke sleeve is placed above the guide sleeve, and is fixed after being interference pressed into the guide sleeve; the armature component is arranged in the rear yoke sleeve and the guide sleeve, and is located above the front yoke sleeve, and the armature component is built-in with an armature permanent magnetic material ring, and the front yoke sleeve is built-in with a front yoke sleeve permanent magnetic material ring. The long end of the armature component is inserted into the center hole of the front yoke sleeve along the center hole and extends into the mechanical control room, and is seated after the armature permanent magnetic material ring and the front yoke sleeve permanent magnetic material ring are freely attracted, and the front yoke sleeve is locked by interference fit and vertically pressed into the guide sleeve and fixed, and the armature component moves under the combined action of electromagnetic force and permanent magnet attraction, thereby forming different openings to achieve the purpose of controlling flow.

2. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The armature permanent magnetic material ring is pressed into the groove of the armature component by interference fit until it is flush with the lower surface of the armature component.

3. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The permanent magnetic material ring of the front yoke sleeve is vertically pressed into the groove of the front yoke sleeve by interference fit until it is flush with the upper surface of the front yoke sleeve.

4. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The distance between the armature permanent magnetic material ring and the front yoke sleeve permanent magnetic material ring can ensure that when the rail pressure control valve is powered off, the armature component and the front yoke sleeve still have appropriate attraction force to seal the mechanical sealing chamber.

5. The permanent magnet rail pressure control valve for a common rail system according to claim 4, characterized in that: The distance between the armature permanent magnetic material ring and the front yoke sleeve permanent magnetic material ring is 0.5 to 30 wires.

6. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The shell, coil component and cover plate are formed into an integral component through a riveting process.

7. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The front yoke sleeve and the guide sleeve are fixed by laser welding.

8. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The rear yoke sleeve and the guide sleeve are fixed by laser welding.

9. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The armature permanent magnetic material ring and the front yoke sleeve permanent magnetic material ring are both annular structures.

10. The permanent magnet rail pressure control valve for a common rail system according to claim 1, characterized in that: The front yoke sleeve, the rear yoke sleeve and the armature component are made of easy-to-cut soft magnetic metal material, to which cobalt and nickel elements are added.

Images