Adjustable metering valve

Abstract

The utility model relates to an adjustable metering valve which comprises a movable iron core (8) installed in an inner shell (1) in a sliding mode, a push rod (9) connected to the movable iron core (8) slides downwards to penetrate through the inner shell (1) and then pushes a valve element (6), and the adjustable metering valve is characterized in that the top face of the movable iron core (8) is sunken downwards to form a spring counter bore, and an adjusting spring (11) is located in the spring counter bore; and the top of an adjusting bolt (10) inserted into the spring counter bore is contacted with the top of the adjusting spring (11). The adjustable metering valve has the advantages of being high in detection and adjustment efficiency and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a metering valve, especially a metering valve which can be conveniently adjusted after assembly, and belongs to the technical field of valves. BACKGROUND

[0002] At present, fuel metering valves are commonly used devices on high-pressure fuel pumps of light trucks and non-road vehicles, such as the Chinese patents CN201220484783.1 "High-pressure common rail fuel metering valve" and CN202010729082.9 "Anti-interference adjustable metering valve" applied by the company. However, in recent years, it has been found in actual production that the metering valve is inconvenient to adjust after assembly, at which time the initial state can only be adjusted by adjusting the spring seat at the oil port, and then retesting on the machine is needed, which needs to be repeated several times to complete, thereby resulting in low efficiency of detection and adjustment. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned defects, and provides an adjustable metering valve with high detection and adjustment efficiency.

[0004] The utility model aims at overcoming the above-mentioned defects, and provides an adjustable metering valve with high detection and adjustment efficiency.

[0005] An adjustable metering valve comprises a moving iron core slidingly installed in an inner housing, a push rod connected to the moving iron core and sliding downward through the inner housing to push a valve core, a spring recess formed downward on the top surface of the moving iron core, an adjusting spring located in the spring recess, and a top portion of an adjusting bolt inserted into the spring recess in contact with the top portion of the adjusting spring.

[0006] Preferably, an end cover is embedded in the top portion of the inner housing, and the adjusting bolt is screwed into the end cover and in contact with the adjusting spring through the end cover.

[0007] Preferably, a valve seat is embedded in the bottom portion of the inner housing, the valve core is slidingly arranged in a valve cavity of the valve seat, a return spring is sleeved on the valve core, the bottom portion of the return spring is in contact with the top surface of the valve seat, and the top portion of the return spring is in contact with the outwardly turned edge of the top portion of the valve core.

[0008] Preferably, the end cover is press riveted to the top portion of the inner housing.

[0009] Preferably, the valve seat is press riveted to the bottom portion of the inner housing.

[0010] Preferably, an electromagnetic coil assembly is sleeved outside the inner housing, and an outer housing is wrapped outside the electromagnetic coil assembly.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model discloses a adjusting bolt is arranged at the top of the metering valve, so when the oil liquid in and out of the bottom is detected, the detection and adjustment can be carried out simultaneously, through the online mode, not only greatly improve the operation efficiency, and greatly detect and adjust more favorably improve its adjustment precision, favorably improve product performance. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure diagram of the adjustable metering valve.

[0014] Among them:

[0015] Inner shell 1, electromagnetic coil assembly 2, outer shell 3, end cap 4, valve seat 5, valve core 6, reset spring 7, moving iron core 8, push rod 9, adjusting bolt 10, adjusting spring 11, gasket 12. SPECIFIC EMBODIMENT

[0016] See Figure 1 The utility model relates to an adjustable metering valve, containing the moving iron core 8 of sliding installation in the inner shell 1, and the push rod 9 connected on the moving iron core 8 slides through the inner shell 1 downward, the electromagnetic coil assembly 2 is wrapped in the outer shell 3 in the inner shell 1, and the top of the inner shell 1 is embedded with one end cap 4 after pressure riveting connection, similarly, the bottom of the inner shell 1 is embedded with one valve seat 5 after pressure riveting connection.

[0017] The valve cavity of valve seat 5 is slidably provided with a valve core 6, the push rod 9 of the above-mentioned through the inner shell 1 is in contact with the top surface of the valve core 6, and the valve core 6 is sleeved with a reset spring 7, the bottom of the reset spring 7 is in contact with the top surface of the valve seat 5, the top of the reset spring 7 is in contact with the outer turning edge of the top of the valve core 6, the adjusting bolt 10 is screwed on the end cap 4, and the top surface of the moving iron core 8 is recessed downward to form a spring counterbore, the adjusting spring 11 is located in the spring counterbore, and the top of the adjusting bolt 10 is in contact with the top of the adjusting spring 11.

[0018] When the metering valve is detected, the metering valve is installed on the detection table, then the online detection and adjustment can be realized in real time by adjusting the adjusting bolt 10 according to the detection data, which greatly improves the work efficiency, and can be adjusted according to the real-time dynamic characteristic curve, further ensuring the quality of the metering valve.

[0019] In addition: it should be noted that the above-mentioned specific embodiment is only an optimization scheme of the patent, and any change or improvement made by the person skilled in the art according to the above-mentioned idea is within the protection scope of the patent.

Claims

1. An adjustable metering valve, comprising a movable iron core (8) slidably mounted in an inner housing (1), wherein a push rod (9) connected to the movable iron core (8) slides downward through the inner housing (1) and pushes a valve core (6), characterized in that: The top surface of the moving iron core (8) is concave downward to form a spring recess, the adjusting spring (11) is located in the spring recess, and the top of the adjusting bolt (10) inserted into the spring recess is in contact with the top of the adjusting spring (11).

2. An adjustable metering valve according to claim 1, wherein: The top of the inner shell (1) is embedded with an end cover (4), the adjusting bolt (10) is screwed into the end cover (4) and in contact with the adjusting spring (11) through the end cover (4).

3. The adjustable metering valve of claim 1, wherein: The bottom of the inner shell (1) is embedded with a valve seat (5), the valve core (6) is slidingly arranged in the valve cavity of the valve seat (5), the valve core (6) is sleeved with a return spring (7), the bottom of the return spring (7) is in contact with the top surface of the valve seat (5), and the top of the return spring (7) is in contact with the outwardly turned edge of the top of the valve core (6).

4. The adjustable metering valve of claim 2, wherein: The end cover (4) is press riveted to the top of the inner shell (1).

5. The adjustable metering valve of claim 3, wherein: The valve seat (5) is press riveted to the bottom of the inner shell (1).

6. The adjustable metering valve of claim 1, wherein: The electromagnetic coil assembly (2) is sleeved outside the inner shell (1), and the outer shell (3) is wrapped outside the electromagnetic coil assembly (2).

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