CN201092904Y - Seal structure for valve seat and armature iron of compressed natural gas injector - Google Patents

Abstract

The utility model relates to a sealed structure between a valve seat and an armature of a compressed natural gas ejector, which comprises the valve seat and the armature, wherein the upper end surface of the valve seat is opposite to the lower end surface of the armature, a rubber packing pad is vulcanized on the upper end surface of the valve seat, the rubber packing pad is composed of a ring plate bottom whose cross section is rectangular shape, a ring-shaped top whose cross section is a semi-circle shape and four reinforced ribs which are distributed along the circumferential direction in a cruciform shape and connect the ring plate bottom and the ring-shaped top. Air currents blow or press to the rubber packing pad when the sealed structure works, the rubber packing pad can not be blow away, the sealed structure is firm, and the service life is long.

Description

Sealing structure between valve seat and armature of compressed natural gas injector

technical field

The utility model belongs to the field of fuel timing and quantitative supply devices for compressed natural gas gas engines, in particular to a sealing structure between a valve seat and an armature of a compressed natural gas injector.

Background technique

Using natural gas instead of oil as fuel is an ideal and feasible way to improve energy structure, reduce pollution and save costs. The injector is an important part of the engine, and its function is to supply the gas fuel to the engine in a regular and quantitative manner. The existing compressed natural gas injector (as shown in Figure 3) includes: injector body 1, valve seat 2, armature 3, spring 4, coil 5, coil casing 6, stop iron 7 and electrical plug 8; The body 1 and the stop iron 7 are inserted into the inner hole of the coil 5, and the coil casing 6 is set on the outside of the coil 5, and the two ends of the coil casing 6 are closed to make the four into one; the injector body 1 is provided with valves in sequence from bottom to top. Seat 2, armature 3 and spring 4, valve seat 2 and injector body 1 are screwed, armature 3 can move up and down in injector body 1, spring 4 bears on armature 3 to make its lower end surface and the upper end surface of valve seat 2 tight close together; the lower end surface of the armature 3 of this injector is vulcanized with a rubber gasket 13, and the rubber gasket 13 acts as a seal between the valve seat 2 and the armature 3, and the armature 7 is provided with an axial through hole 12, and the armature The upper end of 3 is provided with an axial blind hole 9, the lower end of armature 3 is provided with a side hole 10 communicating with the axial blind hole 9, and the valve seat 2 is provided with an axial through hole 11. When the compressed natural gas injector is working, air is fed from the upper end of the axial through hole 12 of the stop iron 7, and the coil 5 is energized to generate electromagnetic suction, and the armature 3 moves upward against the spring force, so that the armature 3 and the valve seat 2 leave a gap, and the gas The channel is opened, the gas passes through the gap, and is sprayed out from the lower end of the axial through hole 11 of the valve seat 2 to realize gas supply. The above-mentioned rubber gasket 13 is easier to be blown away by the air flow during work, and the service life is short, which affects the sealing effect.

Utility model content

The purpose of the utility model is to provide a sealing structure between the valve seat and the armature of a compressed natural gas injector with long service life and good sealing effect.

In order to achieve the above object, the utility model takes the following design scheme:

A sealing structure between a valve seat and an armature of a compressed natural gas injector, comprising: a valve seat and an armature, the upper end surface of the valve seat is opposite to the lower end surface of the armature, and the feature is that a rubber sealing gasket is vulcanized on the upper end surface of the valve seat.

The rubber sealing gasket is composed of a rectangular ring bottom, a semicircular ring top and four cross-shaped reinforcing ribs connecting the ring bottom and the ring top along the circumferential direction.

The utility model has the advantages of:

In the sealing structure between the valve seat and the armature of the compressed natural gas injector of the utility model, since the upper end surface of the valve seat is vulcanized with a rubber gasket, when the coil is powered off, the lower end surface of the armature is tightly connected to the rubber gasket under the action of the spring force. Close together, the sealing performance is better, and the vibration is absorbed, and the airflow blows or presses against the rubber gasket during work, the rubber gasket will not be blown away by the gas, the sealing structure is firm, and the service life is long.

Description of drawings

Fig. 1 is a schematic structural view of a compressed natural gas injector with a structure of the present invention

Fig. 2 is a schematic diagram of the top view structure of the valve seat in the utility model

Figure 3 is a schematic diagram of the structure of the existing compressed natural gas injector

Detailed ways

As shown in Figure 1 and Figure 2, the utility model is a sealing structure between the valve seat and the armature of the compressed natural gas injector, which includes: the valve seat 2 and the armature 3, the upper end surface of the valve seat 2 and the lower end surface of the armature 3 On the contrary, it is characterized in that a rubber gasket 14 is vulcanized on the upper end surface of the valve seat 2 .

The rubber gasket 14 is composed of a ring bottom 15 with a rectangular cross section, an annular top 16 with a semicircular cross section, and four reinforcing ribs 17 distributed in a cross shape along the circumferential direction connecting the ring bottom 15 and the ring top 16 composition.

The compressed natural gas injector (as shown in Figure 1) using the structure of the utility model includes: injector body 1, valve seat 2, armature 3, spring 4, coil 5, coil casing 6, retaining iron 7 and electrical plug 8; The injector body 1 and the retaining iron 7 are inserted into the inner hole of the coil 5, the coil casing 6 is set on the outside of the coil 5, and the two ends of the coil casing 6 are closed to make the four into one; the injector body 1 is sequentially arranged from bottom to top. There are valve seat 2, armature 3 and spring 4. The valve seat 2 is screwed to the injector body 1. The armature 3 can move up and down in the injector body 1. The spring 4 bears on the armature 3 so that its lower end surface and the upper surface of the valve seat 2 The end faces are close together; the upper end face of the valve seat 2 is opposite to the lower end face of the armature 3, and the upper end face of the valve seat 2 is vulcanized with a rubber gasket 14, and the rubber gasket 14 consists of a rectangular ring bottom 15 with a semicircular cross section. Shaped annular top 16 and four reinforcing ribs 17 distributed in a cross shape along the circumferential direction connecting the bottom 15 of the ring piece and the annular top 16 are composed of an axial through hole 12 on the retaining iron 7, and a shaft is provided on the upper end of the armature 3. Facing the blind hole 9 , the lower end of the armature 3 is provided with a lateral hole 10 communicating with the axial blind hole 9 , and the valve seat 2 is provided with an axial through hole 11 .

When the compressed natural gas injector is working, air is fed from the upper end of the axial through hole 12 of the stop iron 7, and the coil 5 is energized to generate electromagnetic suction, and the armature 3 moves upward against the spring force, so that the armature 3 and the valve seat 2 leave a gap, and the gas The channel is opened, the gas passes through the gap, and is sprayed out from the lower end of the axial through hole 11 of the valve seat 2 to realize gas supply.

When the injector is not working, the coil 5 is powered off, and the armature 3 is pressed against the lower valve seat 2 under the action of the spring force to close the gas channel and stop the gas supply.

Claims (2)

1. A sealing structure between the valve seat and the armature of a compressed natural gas injector, which comprises: the valve seat (2) and the armature (3), the upper end surface of the valve seat (2) is opposite to the lower end surface of the armature (3), It is characterized in that a rubber sealing gasket (14) is vulcanized on the upper end surface of the valve seat (2). 2. The sealing structure between the valve seat and the armature of the compressed natural gas injector according to claim 1, characterized in that the rubber gasket (14) consists of a rectangular ring bottom (15) with a semicircular cross section. The ring-shaped top (16) and the four reinforcing ribs (17) that connect the bottom of the ring sheet (15) and the ring-shaped top (16) are formed in a cross shape along the circumferential direction.

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