Valve element assembly, fuel oil electromagnetic valve and method

Abstract

The invention relates to the technical field of fuel oil electromagnetic valves, and particularly discloses a valve element assembly, a fuel oil electromagnetic valve and a method, the valve element assembly comprises a shell, the shell comprises a guide pipe and a static iron core, and the upper portion of the guide pipe is 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 oil electromagnetic valve comprises a driving shell assembly. The valve element assembly serves as an independent part and is fixedly connected with the driving shell assembly. The valve element assembly machining method comprises the steps that flow adjustment is conducted, and the flow adjustment comprises dynamic flow adjustment and static flow adjustment; the fuel oil electromagnetic valve machining method comprises the steps that the valve element assembly is assembled, after flow adjustment is completed, a valve element assembly part finished product is obtained, and then the valve element assembly part finished product and the driving shell assembly are assembled and fixed. The method has the advantages of being good in product production controllability, low in defective rate, high in product metering precision, good in product metering quality and the like.

Description

Technical Field

[0001] The invention relates to the technical field of fuel solenoid valves, and in particular to a valve core component, a fuel solenoid valve and a method. Background Art

[0002] The fuel solenoid valve is a device that uses electromagnetic force to control the opening and closing of the valve. By controlling the on and 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 existing fuel solenoid valve is to first assemble the main components into a complete fuel solenoid valve, and then perform relevant debugging and testing on the fuel solenoid valve. The following problems were found in the production process using the traditional scheme mentioned above: 1. The debugging accuracy is difficult to control accurately, and the defective rate is high. For example, in the lift debugging section (the lift is the extremely small distance between the static iron core and the moving iron core), the limit tube is easily pushed over the stroke of the push rod because the torque cannot be accurately controlled. The current process relies on the interference fit between the limit tube and the static iron core, which directly causes the product to be scrapped; 2. The flow control value after the product leaves the warehouse is different from the There will be differences in the test values ​​of the product flow debugging section, because the traditional process is to assemble the filter only after the dynamic flow and static flow are adjusted (the limit tube and the static iron core adopt an interference fit, and the push rod required is larger to prevent damage to the filter), that is, the test value of the product flow debugging section is the debugging value without the filter, while the actual working condition after use includes the filter, which will affect the application performance of the product (such as precise measurement, etc.); at the same time, debugging without the filter is also prone to foreign matter flowing into the valve flow channel, resulting in product scrapping; 3. After the relevant debugging section is determined, entering the welding section is also prone to deformation due to the high temperature of welding, which in turn leads to changes in the lift value, etc. Summary of the invention

[0003] In view of the above shortcomings, the present invention provides a valve core assembly, a fuel solenoid valve and a method, which adopt technologies and process routes different from traditional ones to comprehensively solve the above technical problems.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] The valve core assembly includes a shell, the shell includes a guide tube and a static iron core, the upper part of the guide tube is connected to the static iron core; a limit tube is arranged in the static iron core, and the limit tube and the static iron core are clearance-matched; a moving iron core and a valve seat are arranged in the guide tube; the valve seat is arranged in the lower part of the guide tube, and a spring is arranged between the moving iron core and the limit tube; a valve is arranged at the lower end of the moving iron core.

[0006] Optionally, the shell further includes a connecting rod; the connecting rod is in a circular tube shape, and a lower end of the connecting rod is coupled to an upper portion of the static iron core.

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

[0008] Optionally, the filter screen and the limiting tube are integrally formed or form an integrated structure.

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

[0010] The fuel solenoid valve includes the valve core assembly as described above, and also includes a drive housing assembly, wherein the drive housing assembly is provided with an electromagnetic drive module, wherein a prefabricated jack for the valve core assembly is provided in the middle, and the valve core assembly is connected and fixed to the drive housing assembly as an independent component.

[0011] A valve core component processing method, a method for processing the valve core component as described above, comprising flow adjustment, wherein the flow adjustment comprises dynamic flow adjustment,

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

[0013] S2: During the adjustment process, the dynamic flow of the valve core assembly is tested while the spring force of the spring is adjusted to adjust the dynamic flow. If the dynamic flow test value is insufficient, the extension of the adjustment push rod is increased; if the dynamic flow is over-adjusted, the retraction of the adjustment push rod is controlled until the test value reaches the target flow, and the adjustment push rod is controlled to remain stationary.

[0014] S3: Fixing the limiting tube.

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

[0016] Optionally, the flow adjustment further includes static flow adjustment.

[0017] After testing the static flow of the product, compare it with the target flow, adjust the step amount of the pushing electrode according to the difference, and adjust the lift by pushing the valve seat through the push rod. When the test value reaches the target flow, the adjustment electrode stops working, and a rivet needle is used to rivet the valve seat at the static flow riveting point. Then, weld or glue the joint between the valve seat and the guide tube. This riveting process can avoid the technical problem of lift change caused by thermal stress deformation of the guide tube after the valve seat and the guide tube are welded.

[0018] Optionally, when the flow rate is adjusted, the valve core assembly is assembled with a filter. A fuel solenoid valve processing method comprises assembling the valve core assembly as described above and completing the flow rate adjustment to obtain a finished valve core assembly component, and then assembling and fixing the finished valve core assembly component with a drive housing assembly. Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention proposes to assemble the valve core assembly as an independent component, and at the same time combines the scheme of gap fitting the limit tube and the static iron core, so that during the dynamic flow adjustment section, the limit tube can be adjusted back and forth up and down relative to the static iron core based on the flow test value, thereby solving the technical problems such as the traditional interference fit, which makes it impossible to adjust the static iron core once the adjustment amount is too much, resulting in product scrapping; at the same time, based on the design of independent components, the limit tube can be riveted and fixed (in the traditional process, the limit tube is first integrated into the drive housing assembly, and the above-mentioned related schemes cannot be implemented).

[0020] 2. In the traditional process, the valve seat and guide tube components are first assembled with the drive housing components to form a preliminary assembly, and then enter the relevant flow adjustment section (so it is impossible to first implement the riveting section and then weld and fix). In the traditional process, after completing the adjustment section, the valve seat and the guide tube are welded, which will cause problems such as lift changes after welding, resulting in quality problems such as product flow accuracy. In this application, the valve seat can be riveted first, and then welded, which effectively prevents problems such as lift changes due to high temperature after subsequent welding, and significantly improves the metering accuracy of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0022] Figure 1 It is a structural schematic diagram of the valve core assembly of the present invention;

[0023] Figure 2 Yes Figure 1 Schematic diagram of the riveting structure;

[0024] Figure 3 is a schematic structural diagram of a drive housing assembly of the present invention;

[0025] Figure 4 It is a schematic diagram of the assembly structure of the valve core assembly and the drive housing assembly of the present invention. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Valve core components, such as Figure 1 As shown, it includes a shell, the shell includes a guide tube 8 and a static iron core 2, the upper part of the guide tube 8 is connected to the static iron core 2; a limit tube 7 is arranged in the static iron core 2, and the limit tube 7 and the static iron core 2 are clearance-matched, that is, in the subsequent flow adjustment, it is conducive to controlling the upper and lower displacement adjustment of the limit tube 7 relative to the static iron core 2; a moving iron core 4 and a valve seat 5 are arranged in the guide tube 8; the valve seat 5 is arranged in the lower part of the guide tube 8, and a spring 3 is arranged between the moving iron core 4 and the limit tube 7; a valve is arranged at the lower end of the moving iron core, and the valve is usually a ball valve. In this embodiment, a perforated sheet 9 is arranged below the valve seat 5; optionally, the shell also 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 iron core 2. It also includes a filter screen 6, which is combined with the upper end of the limit tube 7. In this embodiment, the filter screen 6 and the limit tube 7 are integrally formed or formed into an integrated structure. The effect of such a design is that it can reduce the number of assembly process steps. By combining the filter 6 and the limit tube 7 into one, it can prevent foreign matter from entering the flow channel during the debugging of the relevant flow. The traditional method is to press the filter after the dynamic flow and static flow are adjusted. This solution will result in the relevant flow test before leaving the factory unable to fully simulate the actual application environment of the product (the actual application environment is with a filter). In this embodiment, in order to facilitate the riveting operation of the limit tube 7 in the subsequent relevant work sections, a sink groove or sink hole can also be set on the static iron core 2.

[0030] Optionally, the valve seat 5 and the guide tube 8 are in interference fit.

[0031] Fuel solenoid valve, such as Figures 3-4As shown, it includes the valve core assembly as described above, and also includes a drive housing assembly 10, wherein the drive housing assembly 10 is provided with an electromagnetic drive module 12, and the electromagnetic drive module 12 is provided with a magnetic conductive sleeve 13, wherein a prefabricated socket for the valve core assembly is provided in the middle thereof, and the valve core assembly is connected and fixed to the drive housing assembly as an independent component.

[0032] A valve core component processing method, a method for processing the valve core component as described above, comprising flow adjustment, wherein the flow adjustment comprises dynamic flow adjustment,

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

[0034] S2: During the adjustment process, the dynamic flow of the valve core assembly is tested while adjusting the spring force of the spring to adjust the dynamic flow (the specific operation is: the spring force of the spring 3 is adjusted by adjusting the push rod to push the limit tube 7). If the dynamic flow test value is insufficient, the extension of the push rod is increased; if the dynamic flow is adjusted too much, the retraction of the push rod is controlled (in some embodiments, the spring force of the spring 3 can be used to reverse the limit tube 7 to achieve the callback of the limit tube 7; and in some embodiments, the limit tube 7 can also be actively lifted by the clamping component, that is, because the limit tube 7 is a clearance fit, as long as the retraction of the limit tube 7 can be controlled, it belongs to the protection scope of the present application), until the test value reaches the target flow, the push rod is controlled to remain stationary; the advantages of this solution are: it can adjust the elastic force of the spring 3 in both directions (i.e., it can be adjusted to a large or small size) based on the dynamic flow test process, and it has more flexible adjustment and significantly improved control accuracy compared to the existing process; it can prevent the problem that the traditional limit tube 7 is directly scrapped once it is adjusted too much because it is an interference fit.

[0035] S3: Fix the position limiting tube. During specific processing, it is preferred to use a rivet needle to rivet and fix the position limiting tube at the dynamic flow riveting point, such as Figure 2 As shown, riveting can be performed at the countersunk groove or countersunk hole of the static iron core 2. In some embodiments, the fixing of the position limiting tube can also be fixed by gluing, welding, etc., such as using gluing or resistance welding alone, or combining gluing or welding with other methods for reinforcement after riveting. In this step, the position of fixing the position limiting tube is not limited to between the position limiting tube 7 and the static iron core 2, but can also be between the position 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 includes static flow adjustment.

[0037] After testing the static flow of the product, compare it with the target flow, adjust the step amount of the pushing electrode according to the difference, and adjust the lift by pushing the valve seat through the push rod. When the test value reaches the target flow, the adjustment electrode stops working, and a rivet needle is used to rivet the valve seat at the static flow riveting point. Then, weld or glue the joint between the valve seat and the guide tube. This riveting process can avoid the technical problem of lift change caused by thermal stress deformation of the guide tube after the valve seat and the guide tube are welded.

[0038] Optionally, when performing the flow adjustment, the valve core assembly is installed with a filter screen. In this way, it can ensure that the process can achieve a true simulation of the actual application environment of the product in the flow adjustment section, thereby significantly improving the product metering accuracy.

[0039] Fuel solenoid valve processing method, such as Figure 4 As shown, the valve core assembly as described above is assembled and the flow adjustment is completed to obtain a finished valve core assembly component, and then the finished valve core assembly component is assembled and fixed with the drive housing assembly. During operation, the finished valve core assembly component is pressed into the prefabricated plug hole of the valve core assembly of the drive housing assembly through a relevant device, and then the connection and fixing method can be gluing, such as gluing Figure 4 The J area shown can also be welded. The welding position can be Figure 4 The welding points 11 are shown in a circle.

Claims

1. A valve core assembly, characterized in that: It comprises a shell, which comprises a guide tube and a static iron core, the upper part of the guide tube is connected to the static iron core; a limiting tube is arranged inside the static iron core, and the limiting tube and the static iron core are clearance-matched; a moving iron core and a valve seat are arranged inside the guide tube; the valve seat is arranged at the lower part of the guide tube, and a spring is arranged between the moving iron core and the limiting tube; a valve is arranged at the lower end of the moving iron core.

2. The valve core assembly according to claim 1, characterized in that: The shell also includes a connecting rod and a filter screen; the connecting rod is in a round tube shape, and its lower end is combined with the upper part of the static iron core; the filter screen is combined with the upper end of the limit tube.

3. The valve core assembly according to claim 2, characterized in that: The filter screen and the limiting tube are integrally formed or form an integrated structure.

4. The valve core assembly according to claim 1, characterized in that: The valve seat and the guide tube are in interference fit.

5. Fuel solenoid valve, characterized in that: It comprises a valve core assembly as described in any one of claims 1 to 4, and also comprises a drive housing assembly; the drive housing assembly is provided with an electromagnetic drive module, a prefabricated valve core assembly socket is provided in the middle thereof, and the valve core assembly is connected and fixed to the drive housing assembly as an independent component.

6. A valve core assembly processing method, characterized in that: A method for processing a valve core assembly as claimed in any one of claims 1 to 4, comprising flow adjustment, wherein the flow adjustment comprises dynamic flow adjustment, S1: Fixing the valve core assembly on the lift adjustment device; S2: During the adjustment process, the dynamic flow of the valve core assembly is tested while the spring force of the spring is adjusted to adjust the dynamic flow. If the dynamic flow test value is insufficient, the extension of the adjustment push rod is increased; if the dynamic flow is over-adjusted, the retraction of the adjustment push rod is controlled until the test value reaches the target flow, and the adjustment push rod is controlled to remain stationary. S3: Fixing the limiting tube.

7. The valve core assembly processing method according to claim 6, characterized in that: In S3, a rivet needle is used to rivet and fix the limit tube at the dynamic flow riveting point.

8. The valve core assembly processing method according to claim 6, characterized in that: The flow adjustment also includes static flow adjustment. After testing the static flow of the product, compare it with the target flow, adjust the step amount of the pushing electrode according to the difference, and adjust the lift by pushing the valve seat through the push rod. When the test value reaches the target flow, the adjustment electrode stops working, and use a rivet needle to rivet the valve seat at the static flow riveting point, and then weld or glue the valve seat and the guide tube at the joint.

9. The valve core assembly processing method according to claim 6, characterized in that: When the flow rate is adjusted, the valve core assembly is operated with the filter screen installed.

10. A fuel solenoid valve processing method, characterized in that: After assembling the valve core assembly as claimed in any one of claims 1 to 4 and completing flow adjustment, a finished valve core assembly component is obtained, and then the finished valve core assembly component is assembled and fixed with the drive housing assembly.

Images