Natural gas engine injection electromagnetic valve

Abstract

The natural gas engine injection solenoid valve comprises a shell (1), a valve seat (3), a valve element assembly (4), a coil assembly (7) and a rear cover (8), the valve seat (3), the valve element assembly (4), the coil assembly (7) and the rear cover (8) are located in the shell (1), the rear cover (8) is arranged on the shell (1) in a rotating mode, the coil assembly (7) is pressed to the valve element assembly (4) through the rear cover (8), and a valve element (4-1) forming the valve element assembly (4) is pressed on the valve seat (3) under the action of a spring (4-4). The injection solenoid valve of the natural gas engine has the advantages of being high in control precision and response speed.

Description

Technical Field

[0001] The utility model relates to an injection solenoid valve, in particular to a solenoid valve applied to a natural gas engine for jet control, belonging to the application of the solenoid valve on the engine. Background Technique

[0002] With the country's efforts to achieve the carbon neutrality goal, traditional engines have seen the application and development of various clean fuels. As a clean fuel, natural gas significantly reduces the emissions of carbon-containing exhaust gases such as CO2 after engine combustion, and has a low gas consumption cost, especially popular in the medium and heavy truck fields. However, the requirements for the injection system of natural gas engines are completely different from those of traditional diesel or gasoline engines, requiring higher sealing performance, lubricity, safety, corrosion resistance, etc. Therefore, the demand for injection systems suitable for multi-medium applications is increasing, and the injection solenoid valves applicable to the above injection systems have also been widely used. For example, the "Fuel Injection Valve for Natural Gas Engine" disclosed in Chinese Patent CN201420786305.5; it is controlled by a mechanical valve method, and the accuracy is barely satisfactory, but the response speed cannot meet the needs of high-end models. Therefore, there is an urgent need for an injection solenoid valve for natural gas engines to solve the above problems. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the above deficiencies and provide an injection solenoid valve for natural gas engines with high control accuracy and fast response speed.

[0004] The purpose of the utility model is achieved as follows:

[0005] An injection solenoid valve for natural gas engines includes a housing, and a valve seat, a valve core assembly, a coil assembly and a rear cover located inside the housing. The rear cover is screwed onto the housing, and the rear cover presses the coil assembly against the valve core assembly, and the valve core constituting the valve core assembly is pressed against the valve seat under the action of a spring.

[0006] Preferably, the valve core of the valve core assembly is driven by an armature, and the elastic force of the spring acts on the valve core.

[0007] Preferably, a sheath is sleeved outside the armature, and the spring sleeved on the armature is located between the armature and the sheath.

[0008] Preferably, the valve core and the armature are slidably inserted and matched.

[0009] Preferably, a fifth sealing ring and a friction ring are embedded in the annular sealing groove on the outer wall of the valve core, and the outer wall of the friction ring is in sliding contact with the inner wall of the housing.

[0010] Preferably, the static iron core of the coil assembly is sleeved inside the skeleton, and a coil winding is wound around the skeleton. The pin connected to the coil winding is connected to the wire harness, and the wire harness passes through the rear cover and extends out.

[0011] Preferably, a guide sleeve is sleeved outside the skeleton, and a magnetic isolation ring is sleeved at the front end of the static iron core, and the magnetic isolation ring is located between the static iron core and the guide sleeve.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The present utility model realizes the adjustment of the stroke through the rear cover, and then can accurately control the effective stroke of the solenoid valve, improving the stability of the solenoid valve; at the same time, the valve core assembly adopts an integrated structure, which not only improves the assembly accuracy, is beneficial to improving the performance of the solenoid valve, but also improves the production efficiency; in addition, the valve core assembly is designed with a friction ring structure, reducing the friction between the valve core and the housing, which is beneficial to improving its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of a natural gas engine injection solenoid valve of the present utility model.

[0015] Figure 2 is a schematic structural diagram of the valve seat in the present utility model.

[0016] Figure 3 is a schematic structural diagram of the valve seat in the present utility model (from another perspective).

[0017] Figure 4 is a schematic structural diagram of the valve core assembly in the present utility model.

[0018] Figure 5 is a schematic structural diagram of the coil assembly in the present utility model.

[0019] Figure 6 is a schematic diagram of the closed state of a natural gas engine injection solenoid valve of the present utility model.

[0020] Figure 7 is a schematic diagram of the open state of a natural gas engine injection solenoid valve of the present utility model.

[0021] Wherein:

[0022] housing 1, first sealing ring 2, valve seat 3, valve core assembly 4, second sealing ring 5, corrugated gasket 6, coil assembly 7, rear cover 8, third sealing ring 9, wire harness 10, fourth sealing ring 11;

[0023] air inlet 1-1, air outlet 1-2;

[0024] first outlet channel 3-1, second outlet channel 3-2;

[0025] Spool 4-1, fifth sealing ring 4-2, friction ring 4-3, spring 4-4, sheath 4-5, armature 4-6;

[0026] Counterbore 4-7, air passage 4-8, limit post 4-9, limit counterbore 4-10, shoulder one 4-11, shoulder two 4-12;

[0027] Magnetic isolation ring 7-1, guide sleeve 7-2, coil winding 7-3, skeleton 7-4, pin 7-5, pressure plate 7-6, static iron core 7-7;

[0028] Adjusting air gap δ, maximum air gap X0, spool opening stroke X1, minimum air gap x2. Specific implementation manner

[0029] See Figures 1 - 7 , a natural gas engine injection solenoid valve related to the present utility model includes a housing 1, a plurality of air inlets 1-1 are provided at the front end of the housing 1, and a first sealing ring 2 and a second sealing ring 5 are respectively sleeved on the outer part of the front end and the outer part of the middle end of the housing 1, so as to ensure the seal between the installation and external equipment;

[0030] A valve seat 3 is embedded on the step surface of the air outlet 1-2 at the front end of the housing 1, and a fourth sealing ring 11 is provided between the valve seat 3 and the step surface of the air outlet 1-2. A plurality of second outlet channels 3-2 provided on the outer end surface of the valve seat 3 and a plurality of first outlet channels 3-1 provided on the inner end surface correspond to each other one by one and are communicated, so that the gas enters through the first outlet channel 3-1 at the small opening end and expands at the second outlet channel 3-2 at the large opening end and is ejected from the air outlet 1-2 at the front end of the housing 1.

[0031] A spool assembly 4, a coil assembly 7 and a rear cover 8 are sequentially installed in the housing 1. The spool assembly 4 includes a spool 4-1. A ring-shaped fifth sealing ring 4-2 is embedded in the sealing groove with a ring-shaped structure on the outer wall of the spool 4-1, and a friction ring 4-3 is embedded in the sealing groove to block the fifth sealing ring 4-2. The outer wall of the friction ring 4-3 is in sliding fit with the inner wall of the housing 1, so as to reduce the friction between the housing 1 and the spool 4-1 while ensuring the seal;

[0032] The front end face of the valve core 4-1 faces the first outlet passage 3-1 of the valve seat 3. A counterbore 4-7 is formed by concave inward at the center of the front end face of the valve core 4-1. The valve core 4-1 is provided with a plurality of air passages 4-8 arranged radially and communicating with the counterbore 4-7. A limiting post 4-9 is protrudingly arranged on the rear end face of the valve core 4-1. The limiting post 4-9 is inserted into the limiting counterbore 4-10 of the armature 4-6. At the same time, a sheath 4-5 is sleeved outside the armature 4-6. An annular shoulder 4-11 is arranged inside the sheath 4-5. The shoulder 4-11 abuts against the shoulder 4-12 of the armature 4-6. The spring 4-4 sleeved outside the armature 4-6 is located in the gap between the armature 4-6 and the sheath 4-5. One end of the spring 4-4 abuts against the valve core 4-1 and the other end abuts against the shoulder 4-11.

[0033] The coil assembly 7 includes a coil winding 7-3 mounted on a bobbin 7-4. The coil winding 7-3 mounted on the bobbin 7-4 is sleeved on a static iron core 7-7. The coil winding 7-3 mounted on the bobbin 7-4 is sleeved with a guide sleeve 7-2 outside. A corrugated gasket 6 is arranged between the outer wall of the guide sleeve 7-2 and the inner wall of the housing 1. A magnetic isolation ring 7-1 is sleeved on the front end of the static iron core 7-7. The magnetic isolation ring 7-1 is located between the static iron core 7-7 and the guide sleeve 7-2. A pressing plate 7-6 is pressed on the rear end of the static iron core 7-7. The pins 7-5 of the coil winding 7-3 are led out through a wire harness 10.

[0034] The rear cover 8 rotates at the rear end of the housing 1 (i.e., the rear end hole of the housing 1 is a threaded hole, and the external thread on the outer wall of the rear cover 8 is screwed into the threaded hole at the rear end of the housing 1). The wire harness 10 is led out through the rear cover 8. At the same time, a third sealing ring 9 is arranged between the rear cover 8 and the inner wall of the inner body 1.

[0035] See Figure 6 , when the injection solenoid valve of a natural gas engine of the present utility model is closed, by adjusting the screwing depth of the thread on the rear cover 8, the entering depth of the coil assembly 7 is pushed by the rear cover 8. Then, the entering position of the sheath 4-5 of the valve core assembly 4 is pushed by the coil assembly 7, so as to precisely control the size of the adjustment air gap δ between the sheath 4-5 and the valve core 4-1. At the same time, the maximum air gap X0 between the armature 4-6 and the static iron core 7-7 is also adjusted.

[0036] See Figure 7, when the injection solenoid valve of a natural gas engine of the present utility model is opened, since the valve core opening stroke X1 between the valve core 4-1 and the valve seat 3 is determined by the regulating air gap δ adjusted when not energized, thus determining the opening flow rate of the solenoid valve; while the minimum air gap x2 between the armature 4-6 and the static iron core 7-7 is determined by the maximum air gap X0 and the regulating air gap δ adjusted when not energized, thereby determining the response speed of the solenoid valve. Therefore, by adjusting the rear cover 8, the valve core position of the solenoid valve can be precisely adjusted and controlled flexibly, thereby improving the response speed of the solenoid valve. [[ID=))

[0037] In addition: It should be noted that the above specific implementation manner is only an optimized solution of this patent, and any changes or improvements made by those skilled in the art based on the above conceptions are within the protection scope of this patent.

Claims

1. A natural gas engine injection solenoid valve, comprising a housing (1), and a valve seat (3), a spool assembly (4), a coil assembly (7) and a rear cover (8) located within the housing (1), characterized in that: The rear cover (8) is screwed onto the housing (1), and the rear cover (8) presses the coil assembly (7) towards the spool assembly (4), causing the spool (4-1) of the spool assembly (4) to be pressed against the valve seat (3) under the action of a spring (4-4).

2. The injection solenoid valve for a natural gas engine according to claim 1, wherein: The spool (4-1) of the spool assembly (4) is driven by an armature (4-6), and the elastic force of the spring (4-4) acts on the spool (4-1).

3. The injection solenoid valve for a natural gas engine according to claim 2, characterized in that: A sheath (4-5) is sleeved outside the armature (4-6), and the spring (4-4) sleeved on the armature (4-6) is located between the armature (4-6) and the sheath (4-5).

4. The injection solenoid valve for a natural gas engine according to claim 2, characterized in that: The spool (4-1) is in sliding plug-in fit with the armature (4-6).

5. The injection solenoid valve for a natural gas engine according to claim 2, wherein: A fifth sealing ring (4-2) and a friction ring (4-3) are embedded in an annular sealing groove on the outer wall of the spool (4-1), and the outer wall of the friction ring (4-3) is in sliding contact with the inner wall of the housing (1).

6. The injection solenoid valve for a natural gas engine according to claim 1, wherein: The static iron core (7-7) of the coil assembly (7) is sleeved within a skeleton (7-4), and a coil winding (7-3) is wound around the skeleton (7-4). The pin (7-5) connected to the coil winding (7-3) is connected to a wire harness (10), and the wire harness (10) passes through the rear cover (8) and is led out.

7. The injection solenoid valve for a natural gas engine according to claim 6, characterized in that: A guide sleeve (7-2) is sleeved outside the skeleton (7-4). A magnetic isolation ring (7-1) is sleeved on the front end of the static iron core (7-7), and the magnetic isolation ring (7-1) is located between the static iron core (7-7) and the guide sleeve (7-2).

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