Valve core assembly, fuel solenoid valve and method

Abstract

The present application relates to the technical field of fuel solenoid valve, and discloses a valve core assembly, a fuel solenoid valve and a method, the valve core assembly comprising a shell, the shell comprising a guide pipe and a static iron core, the upper part of the guide pipe being connected with the static iron core; a limiting pipe is arranged in the static iron core, and the limiting pipe is in clearance fit with the static iron core. The fuel solenoid valve comprises a driving shell assembly; the valve core assembly is connected and fixed with the driving shell assembly as an independent component. The valve core assembly processing method comprises flow adjustment, and the flow adjustment comprises dynamic flow adjustment and static flow adjustment; the fuel solenoid valve processing method comprises the following steps: after the valve core assembly is assembled and the flow adjustment is completed, a valve core assembly component finished product is obtained, and then the valve core assembly component finished product is assembled and fixed with the driving shell assembly. The present application has the advantages of good controllability of product production, low rate of defective products, high product measurement precision, good quality and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel solenoid valves, in particular to a valve core assembly, a fuel solenoid valve and a method. BACKGROUND

[0002] The fuel solenoid valve is a device for controlling the opening and closing of the valve by using electromagnetic force. By controlling the on-off and size of the current, the flow rate and injection time of the fuel can be accurately controlled. The current process route of the fuel solenoid valve is to first assemble the main parts into a complete fuel solenoid valve, and then perform related debugging and detection and other related operations on the fuel solenoid valve. In the production process using the traditional scheme, the following problems are found: 1. It is difficult to accurately control the debugging accuracy, and the scrap rate is high. For example, in the lift debugging section (the extremely small gap between the static core and the moving core), during the stroke process of the top rod pushing the limiting tube, because the torque cannot be accurately controlled, the limiting tube is easily pushed out of position. The current process relies on the interference fit between the limiting tube and the static core, so the product is directly discarded; 2. There will be differences between the flow control value after the product is delivered and the test value in the product flow debugging section. Because the traditional process is to adjust the dynamic flow and the static flow before assembling the filter screen (the limiting tube and the static core adopt interference fit, and a larger top rod is needed to prevent damage to the filter screen), the test value in the product flow debugging section is the debugging value without the filter screen, while the actual working condition after use includes the filter screen, which will affect the application performance (such as accurate metering) of the product. At the same time, without the filter screen, foreign matter is easily flowed into the valve flow channel, resulting in product scrap; 3. After the related debugging section is determined, the welding section is entered, and deformation is easily caused by high temperature welding, which will cause changes in the lift value, etc. SUMMARY

[0003] In view of the above problems, the present application provides a valve core assembly, a fuel solenoid valve and a method, which are different from the traditional technology and process route to comprehensively solve the above technical problems.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] The valve core assembly comprises a shell, the shell comprises a guide pipe and a static core, the upper part of the guide pipe is connected with the static core; a limiting tube is arranged in the static core, and the limiting tube and the static core are in clearance fit; a moving core and a valve seat are arranged in the guide pipe; the valve seat is arranged at the lower part of the guide pipe, a spring is arranged between the moving core and the limiting tube; and a valve is arranged at the lower end of the moving core.

[0006] Optionally, the shell further comprises a connecting rod; the connecting rod is in the shape of a circular tube, and the lower end of the connecting rod is combined with the upper part of the static core.

[0007] Optionally, a filter screen is combined with the upper end of the limiting tube.

[0008] Optionally, the filter screen is integrally formed with the limiting tube or formed as an integral structure.

[0009] Optionally, the valve seat and the guide tube are in interference fit.

[0010] The fuel solenoid valve comprises the valve core assembly as described above, and further comprises a driving shell assembly provided with an electromagnetic driving module, wherein a valve core assembly prefabricated insertion hole is arranged in the middle part, and the valve core assembly is connected and fixed with the driving shell assembly as an independent part.

[0011] The valve core assembly processing method is a method for processing the valve core assembly as described above, and comprises flow adjustment, wherein the flow adjustment comprises dynamic flow adjustment,

[0012] S1: fixing the valve core assembly on a lift adjustment device;

[0013] S2: during the adjustment process, the spring force of the spring is adjusted to adjust the dynamic flow while testing the dynamic flow of the valve core assembly, if the dynamic flow test value is insufficient, the extension amount of the adjustment top rod is increased, if the dynamic flow is adjusted too much, the retraction amount of the adjustment top rod is controlled until the test value reaches the target flow, and then the adjustment top rod is controlled to be stationary;

[0014] S3: fixing the limiting tube.

[0015] Optionally, in S3, a rivet needle is used to rivet and fix the limiting tube at the dynamic flow riveting point.

[0016] Optionally, the flow adjustment further comprises static flow adjustment,

[0017] After testing the static flow of the product, the target flow is compared, the step amount of the push electrode is adjusted according to the difference, the lift is adjusted by the top rod pushing the valve seat, the electrode stops working when the test value reaches the target flow, a rivet needle is used to rivet and fix the valve seat at the static flow riveting point, and then the valve seat and the guide tube are welded or glued at the joint, and the riveting process can avoid the technical problem that the lift changes due to the thermal stress deformation of the guide tube after the valve seat and the guide tube are welded.

[0018] Optionally, the flow adjustment is performed under the condition that the valve core assembly is assembled with a filter screen.

[0019] 1、The valve core assembly is assembled as an independent component, and the limit tube is combined with the static iron core in a clearance fit, so that the limit tube can be adjusted up and down relative to the static iron core based on the flow test value during dynamic flow regulation, solving the problem of product scrap caused by excessive adjustment of the static iron core due to interference fit in traditional technology; at the same time, based on the design of independent components, the limit tube can be riveted and fixed (in traditional technology, the limit tube is first integrated into the drive shell assembly, and the above-mentioned related scheme cannot be realized).

[0020] 2、In traditional technology, the valve seat and the guide pipe component are first assembled and processed with the drive shell assembly to form a preliminary assembly, and then enter the related flow adjustment section, (so it cannot be riveted first and then welded), in traditional technology, after completing the adjustment section, the valve seat and the guide pipe are welded, which will cause problems such as lift change after welding, resulting in problems such as decline in product flow accuracy. In this application, the valve seat can be riveted first and then welded, effectively preventing problems such as lift change due to high temperature after subsequent welding, and significantly improving the measurement accuracy of the final product. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description.

[0022] Figure 1 is a structural schematic view of the valve core assembly of the present application;

[0023] Figure 2 is a structural schematic view of the riveting of Figure 1 ;

[0024] Figure 3 is a structural schematic view of the drive shell assembly of the present application;

[0025] Figure 4 is a structural schematic view of the assembly of the valve core assembly and the drive shell assembly of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in combination 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the terms "inner", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arrangement", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The valve core assembly, as shown in Figure 1 includes a housing, the housing includes a guide pipe 8 and a static core 2, the upper part of the guide pipe 8 is connected with the static core 2; a limiting pipe 7 is arranged in the static core 2, the limiting pipe 7 is gap-fitted with the static core 2, that is, it is conducive to controlling the up-down displacement adjustment of the limiting pipe 7 relative to the static core 2 in subsequent flow adjustment; a dynamic core 4 and a valve seat 5 are arranged in the guide pipe 8; the valve seat 5 is arranged at the lower part of the guide pipe 8, and a spring 3 is arranged between the dynamic core 4 and the limiting pipe 7; the lower end of the dynamic core is provided with a valve, which is usually a ball valve. In this embodiment, a hole sheet 9 is arranged below the valve seat 5; optionally, the housing further includes a connecting rod 1; the connecting rod 1 is in the shape of a circular tube, and its lower end is combined with the upper part of the static core 2. It further includes a filter screen 6, which is combined with the upper end of the limiting pipe 7. In this embodiment, the filter screen 6 is integrally formed with the limiting pipe 7 or formed as an integral structure. The design has the effect of reducing the assembly process steps. By integrating the filter screen 6 with the limiting pipe 7, it can avoid foreign matter from entering the flow channel during the related flow adjustment process. The traditional way is to press-fit the filter screen after the dynamic flow and static flow adjustment, which cannot simulate the actual application environment of the product (the actual application environment is with a filter screen). In this embodiment, in order to facilitate the riveting operation of the limiting pipe 7 in the subsequent related work section, a counterbore or a counterbore can also be arranged on the static core 2.

[0030] Optionally, the valve seat 5 and the guide pipe 8 are interference-fitted.

[0031] The fuel solenoid valve, as shown in Figures 3-4As shown, the valve core assembly as described above further comprises a driving housing assembly 10, which is provided with an electromagnetic driving module 12, and the electromagnetic driving module 12 is provided with a magnetic conducting sleeve 13, wherein a valve core assembly prefabricated insertion hole is arranged, and the valve core assembly is connected and fixed with the driving housing assembly as an independent component.

[0032] The valve core assembly processing method is used for processing the valve core assembly as described above, and the method comprises flow adjustment, and the flow adjustment comprises dynamic flow adjustment,

[0033] S1: fixing the valve core assembly on a lift adjustment device;

[0034] S2: adjusting the spring force of the spring while testing the dynamic flow of the valve core assembly to adjust the dynamic flow (the specific operation is: adjusting the spring force of the spring 3 by adjusting the extension amount of the adjusting rod pushing the limiting tube 7), if the dynamic flow test value is insufficient, the extension amount of the adjusting rod is increased, if the dynamic flow is adjusted too much, the retraction amount of the adjusting rod is controlled (in some embodiments, the retraction of the limiting tube 7 can be realized by relying on the spring force of the spring 3 acting on the limiting tube 7 in the opposite direction; and in some embodiments, the limiting tube 7 can also be actively lifted by the clamping component, that is, because the limiting tube 7 is a clearance fit, as long as the retraction of the limiting tube 7 can be controlled, this also belongs to the protection scope of the present application), and the adjusting rod is controlled to be stationary until the test value reaches the target flow. The advantage of this scheme is that it can simultaneously adjust the spring force of the spring 3 in both directions (i.e., it can be adjusted to be large or small) based on the test process of the dynamic flow, which has more flexible adjustment and significantly improves the adjustment accuracy compared with the existing process. It can prevent problems such as direct scrap due to the interference fit of the traditional limiting tube 7 once the adjustment is too much.

[0035] S3: fixing the limiting tube, and during processing, a rivet needle can be preferably used to rivet and fix the limiting tube at the dynamic flow riveting point, such as Figure 2 As shown, riveting can be performed at the sink groove or sink hole of the static iron core 2. In some embodiments, the limiting tube can also be fixed by using methods such as gluing and welding, such as using gluing or resistance welding alone, or reinforcing by combining gluing or welding after riveting. In this step, the position of the fixed limiting tube is not limited to between the limiting tube 7 and the static iron core 2, but can also be between the limiting tube 7 and the connecting rod 1, or between the filter screen 6 and the static iron core 2, or between the filter screen 6 and the connecting rod 1.

[0036] Optionally, the flow adjustment further comprises static flow adjustment,

[0037] After testing the static flow of the product, the target flow is compared, the step amount of the push electrode is adjusted according to the difference, the lift is adjusted by pushing the valve seat with the top rod, the electrode stops working when the test value reaches the target flow, the valve seat is riveted and fixed at the static flow riveting point using a rivet needle, and then the valve seat and the guide pipe joint are welded or glued, which can avoid the technical problem that the lift changes due to the thermal stress deformation of the guide pipe after the valve seat and the guide pipe are welded.

[0038] Optionally, when the flow adjustment is performed, the valve core assembly is assembled with a filter screen, so that the process in the flow adjustment section can realize full simulation of the actual application environment of the product, and the product metering accuracy is significantly improved.

[0039] The fuel electromagnetic valve processing method, as shown in Figure 4 , assembles and completes the flow adjustment of the valve core assembly component product obtained after the valve core assembly component product is assembled and the flow adjustment is completed, and then assembles and fixes the valve core assembly component product and the drive shell assembly. When operating, the valve core assembly component product is pressed into the valve core assembly pre-insertion hole of the drive shell assembly through a related device, and then the connection and fixation mode can be gluing, and the gluing is a J zone as shown in Figure 4 , or welding can be performed, and the welding position can be a welding point 11 as shown in Figure 4 .

Claims

1. A valve core assembly, characterized in that: The device includes a housing, which comprises a guide tube and a stationary iron core. The upper part of the guide tube is connected to the stationary iron core. A limit tube is disposed inside the stationary iron core, and the limit tube is clearance-fitted to the stationary iron core. A moving iron core and a valve seat are disposed inside the guide tube. The valve seat is disposed at the lower part of the guide tube, and a spring is disposed between the moving iron core and the limit tube. A valve, which is a ball valve, is disposed at the lower end of the moving iron core. The housing also includes a connecting rod and a filter screen. The connecting rod is cylindrical, and its lower end is connected to the upper part of the stationary iron core. The filter screen is connected to the upper end of the limit tube. The valve seat and the guide tube are interference-fitted.

2. The valve core assembly according to claim 1, characterized in that: The filter screen and the limiting tube are integrally formed or formed into a single structure.

3. A fuel solenoid valve, characterized in that: The device includes the valve core assembly as described in any one of claims 1 to 2, and further includes a drive housing assembly; the drive housing assembly is provided with an electromagnetic drive module, and a pre-fabricated insertion hole for the valve core assembly is provided in its middle, and the valve core assembly is connected and fixed to the drive housing assembly as an independent component.

4. A method for processing valve core components, characterized in that: A method for processing a valve core assembly as described in any one of claims 1-2 includes flow adjustment, wherein the flow adjustment includes dynamic flow adjustment. S1: Fix the valve core assembly to the lift adjustment device; S2: During the adjustment process, while testing the dynamic flow rate of the valve core assembly, the spring force of the spring is adjusted to adjust the dynamic flow rate. If the dynamic flow rate test value is insufficient, the extension amount of the adjusting rod is increased; if the dynamic flow rate is over-adjusted, the retraction amount of the adjusting rod is controlled until the test value reaches the target flow rate, and then the adjusting rod is controlled to remain stationary. S3: Fix the limiting tube.

5. The valve core assembly processing method according to claim 4, characterized in that: In step S3, a rivet is used to rivet and fix the limiting tube at the dynamic flow rivet point.

6. The valve core assembly processing method according to claim 4, characterized in that: The flow adjustment also includes static flow adjustment. After testing the static flow rate of the product, compare it with the target flow rate. Adjust the step size of the push electrode according to the difference. Adjust the lift by pushing the valve seat with the push rod. When the target flow rate is reached, the adjustment electrode stops working. Use a rivet to rivet and fix the valve seat at the static flow rivet point. Then weld or glue the valve seat and guide tube at the joint.

7. The valve core assembly processing method according to claim 4, characterized in that: The valve core assembly is performed with the filter screen installed during the flow adjustment.

8. A method for processing a fuel solenoid valve, characterized in that: After assembling the valve core assembly as described in any one of claims 1 to 2 and completing the flow adjustment, a finished valve core assembly component is obtained. Then, the finished valve core assembly component is assembled and fixed with the drive housing assembly.

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