阅读说明：本技术 喷射器 (Ejector ) 是由 远藤嵩之 村上努 于 2019-05-13 设计创作，主要内容包括：提供一种喷射器,用物理方式抑制阀体位移时的倾斜,另外,通过使工作稳定化来防止挡止橡胶或阀体橡胶的不均匀磨损,从而消除阀体的位移量的增加以减小作用于板簧上的应力,进而不损害阀体的响应性且能够长期确保闭阀时的密封性。通过盘簧(7)和多个板簧(6、6)的配合在闭阀方向上对开闭阀(2)的阀体(21)施加力,从而在未通电时维持闭阀状态,盘簧沿所述阀体(21)的行程方向配置,多个板簧相对于阀体(21)的行程方向成直角设置且以支撑所述阀体(21)的方式配置。(Provided is an injector which can physically suppress the inclination of a valve body when the valve body is displaced, and can prevent uneven wear of stopper rubber or valve body rubber by stabilizing the operation, thereby eliminating the increase of the displacement amount of the valve body to reduce the stress acting on a plate spring, and further can ensure the sealing performance when the valve is closed for a long time without damaging the responsiveness of the valve body. A coil spring (7) is disposed along the stroke direction of the valve body (21) and a plurality of leaf springs (6, 6) are disposed at right angles to the stroke direction of the valve body (21) and are disposed in a manner of supporting the valve body (21) by applying force to the valve body (21) of the opening and closing valve (2) in the valve closing direction so as to maintain the valve closing state when not energized.)

1. An injector which maintains a valve-closed state when not energized by utilizing electromagnetic drive and applying a force in a valve-closing direction to a valve body of an opening and closing valve by engagement of a coil spring arranged along a stroke direction of the valve body and a plate spring arranged so as to support the valve body and provided at right angles to the stroke direction of the valve body,

The leaf spring is formed of a plurality of leaf springs arranged in a stroke direction of the valve body.

2. The injector according to claim 1, wherein the plurality of leaf springs are arranged with a predetermined interval therebetween in a stroke direction of the valve body.

3. The injector of claim 1 or 2, wherein the plurality of leaf springs is 2.

Technical Field

The present invention relates to an electromagnetic drive type injector for injecting fuel at a flow rate required by an engine, and more particularly to a normally closed type injector in which a valve body of an on-off valve (fuel regulating valve) is pressed against a valve seat by a spring load generated by an elastic repulsive force of a valve spring to ensure sealability when the valve is closed.

Background

In the conventionally used electromagnetic drive type injector, an electromagnetic coil is energized to excite the electromagnetic coil and thereby attract a movable iron core to open an on-off valve, however, in order to achieve the purpose of setting an electric signal for operating the on-off valve to an operation signal of about 0.001 to 0.02 seconds and accurately controlling fuel by repeating such an extremely short operation time, the fuel injection valve itself is required to have high responsiveness, and in recent years, the user is required to have extremely high durability due to a demand for high quality.

As a valve spring for closing the valve body of the injector, there are known: a structure using a coil spring incorporated between a fixed iron core and a movable iron core, and a structure using a thin plate-like plate spring in which an outer peripheral edge portion is fixed, a movable iron core and a valve body are fixed at a center capable of displacement, and fuel can pass through, are advantageous in durability and responsiveness because a plate spring which has no sliding portion and can support a floating state and perform linear motion is not used in an injector for injecting gas fuel such as natural gas (CNG) as disclosed in japanese laid-open patent publication No. 61-105756, for example.

However, in the injector having the structure in which the plate spring applies a force to the valve body, although the sealing performance at the time of closing the valve can be ensured by the spring load generated by the elastic repulsive force of the plate spring, the deterioration of the material constituting the plate spring causes the elastic repulsive force of the plate spring to be lowered and the spring load to be reduced, so that the sealing performance of the opening and closing valve becomes insufficient, and the problem of fuel leakage at the time of closing the valve is likely to occur.

Therefore, japanese patent application laid-open No. 2009-91998 discloses an injector in which a coil spring is provided along the stroke direction of the valve body, and a closed valve state is maintained by a double spring load by engaging 2 springs, that is, a leaf spring and the coil spring, when the valve is closed, whereby the closed valve state of the valve body can be ensured for a long period of time by the spring load of the valve spring.

In general, in an injector for injecting a gaseous fuel, in order to obtain the same engine output as that obtained when a liquid fuel is used, it is necessary to have a larger fuel passage cross-sectional area than that obtained when a liquid fuel is used, and therefore the displacement amount of the valve body increases. Therefore, although the injector body is inevitably enlarged due to the stress acting on the leaf spring when the leaf spring structure is used, it is known that the size increase can be prevented without impairing the advantages of the leaf spring structure by using the coil spring as the return spring while supporting the valve body in the middle of the on-off valve in a floating state, as disclosed in japanese patent laid-open No. 2008-144693.

However, since the conventional plate spring structure is composed of 1 spring body, the Valve body is supported only by the center portion, and the operation tends to be unstable due to various disturbances, and if a local force is applied to a Stopper rubber (Stopper rubber) provided on the movable iron core or a Valve body rubber (Valve rubber) provided on the Valve body at the time of opening and closing the Valve, the Stopper rubber or the Valve body rubber is unevenly worn, and thus the displacement amount of the Valve body is increased, and the stress acting on the plate spring is increased, and thus there is a problem that the function of the injector is impaired.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a normally closed type injector which can physically suppress inclination when a valve body is displaced, and which can prevent uneven wear of stopper rubber, valve body rubber, or the like by stabilizing operation, thereby eliminating an increase in displacement amount of the valve body to reduce stress acting on a leaf spring, and further can secure sealing performance when the valve is closed for a long period of time without impairing responsiveness of the valve body.

Means for solving the problems

An injector according to the present invention for solving the above-described problems is an injector that maintains a valve-closed state when not energized by using electromagnetic drive and applying a force in a valve-closing direction to a valve body of an opening/closing valve by engagement of a coil spring arranged along a stroke direction of the valve body and a plate spring arranged so as to support the valve body and arranged at right angles to the stroke direction of the valve body, characterized in that the plate spring is formed of a plurality of plate springs arranged along the stroke direction of the valve body.

In the present invention, the plurality of leaf springs are arranged so as to have a predetermined interval therebetween in the stroke direction of the valve body, whereby the stress generated in each leaf spring when the valve body is opened and closed can be reliably and uniformly dispersed and reduced.

Further, in the present invention, when the number of the plurality of leaf springs is 2, the effects can be exhibited by a small number of components and a simple structure.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a normally closed type injector which can physically suppress inclination when a valve body is displaced, and which can prevent uneven wear of stopper rubber, valve body rubber, or the like by stabilizing operation, thereby eliminating an increase in displacement amount of the valve body, reducing stress acting on a plate spring, and preventing damage, and which can ensure sealing performance when the valve is closed for a long period of time without impairing responsiveness of the valve body.

Drawings

Fig. 1 is a longitudinal sectional partial view showing a closed valve state of an injector according to an embodiment of the present invention.

Description of the reference numerals

Injector 1, opening/closing valve 2, electromagnetic coil 3, lower plate 4, movable iron core 5, plate spring 6, coil spring 7, inner ring 8, main body 9, outer ring 10, fixed iron core 11, valve body 21, valve seat 22, stopper rubber 51, inner periphery of 61, outer periphery of 62, nozzle 91, valve body rubber 211, sealing surface 221

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic view of a part of a vertical cross section of an electromagnetic injector 1 for implementing a preferred embodiment of the present invention, the injector 1 supplying fuel to a gas engine, the electromagnetic injector 1 including an on-off valve 2, the on-off valve 2 including a valve body 21 and a valve seat 22; the injector 1 includes an electromagnetic coil 3, a lower plate 4, and a movable core 5, a valve body 21 having a valve body rubber 211 at the tip is disposed below (downstream of) the movable core 5, and the movable core 5 and the valve body 21 are supported in a floating state by a pair of plate spring 6, 6 in the shape of a thin plate disk, and the pair of plate spring 6, 6 is disposed at a right angle to the valve stroke direction.

Each plate spring 6 is fixed to the main body 9 side, the main body 9 has an opening portion of a predetermined shape for passing fuel, and a nozzle 91 is formed in a peripheral edge portion of the main body 9, each plate spring 6 supports the movable core 5 at an upper side (upstream side) and the valve body 21 at a lower side (downstream side), and a central portion of each plate spring 6 is returned in the vertical direction by elastic deformation, and each plate spring 6 is pressed downward by a load of the coil spring 7, so that the valve body rubber 211 of the valve body 21 is brought into close contact with the sealing surface 221 of the valve seat 22, thereby forming a valve-closed state.

In the present embodiment, the inner peripheral edges of the leaf springs 6, 6 are fixed to a hollow cylindrical inner ring 8, the inner ring 8 is disposed so as to be sandwiched between the movable iron core 5 and the valve body 21, the outer peripheral edges of the leaf springs 6, 6 are fixed to a hollow cylindrical outer ring 10, and the outer ring 10 is disposed so as to be sandwiched between the main body 9 and the lower plate 4, whereby the leaf springs 6, 6 are supported by being bridged between the main body 9 and the valve body 21 interlocked with the movable iron core 5, so that the leaf springs 6, 6 are disposed side by side at right angles to the valve stroke direction with a predetermined interval therebetween.

Further, as in the conventional example, a coil spring 7 is provided above the valve body 21 in the valve stroke direction, and the coil spring 7 is disposed in a compressed state in the vertical direction so as to apply a force to the valve body 21 of the opening/closing valve 2 in the valve closing direction.

In the drawing, reference numeral 51 denotes a stopper rubber which is disposed on the upstream side of the movable iron core 5 and absorbs an impact when the movable iron core 5 (the valve body 21) hits the bottom of the fixed iron core 11 when the movable iron core 5 is lifted when the valve is opened.

In the present embodiment having the above-described configuration, the electromagnetic coil 3 is energized to be excited and the movable iron core 5 is attracted, and the opening/closing valve 2 is opened against the biasing force of the coil spring 7 and the plate springs 6 and 6, as in the conventional injector of this type, but in the present embodiment, the valve body 21 is supported by a plurality of (2) plate springs 6 and 6 arranged at predetermined intervals.

Thus, unlike the conventional leaf spring structure described above in which one leaf spring supporting the valve body only at one point in the center portion is used, since the leaf springs are supported by the 2 leaf springs 6 and 6 arranged at predetermined intervals, the operation is not unstable due to various disturbances, and the valve body rubber 211 (or the stopper rubber 51) is not unevenly worn, the displacement amount of the valve body 21 is not increased, and the stress acting on the leaf springs 6 and 6 is not increased at the time of opening and closing the valve, so that the function of the injector 1 is not impaired.

In particular, in the present embodiment, since the inner peripheral edge 61 and the outer peripheral edge 62 of the leaf springs 6, 6 are fixed at predetermined positions by the inner ring 8 and the outer ring 10, the leaf springs 6, 6 are respectively and reliably supported at the predetermined positions at right angles to each other in the valve stroke direction with a predetermined interval therebetween, so that the springs can be reliably operated, and also can be easily and quickly manufactured at the time of assembly.

In the present embodiment, 2 leaf springs 6, 6 are used to reduce the number of components and simplify the structure, but a plurality of leaf springs may be used, and the leaf springs may be appropriately selected and used according to the capacity of the injector 1 to be used, the material and thickness of the leaf springs 6, and the like.