JPS58185972A - Intermittent type swirl injection valve - Google Patents

Abstract

PURPOSE:To set the angle of spray to a desired angle and to prevent foreign matters from entering into an injection port, by projectingly providing, at the front end part of a vale needle in an intermittent type swirl injection valve, a predetermined shaft- diameter pin adapted to be inserted in the injection port, in such a length that the pin is not immersed below the front opening surface of the injection port even upon the valve opening. CONSTITUTION:An intermittent type swirl injection valve comprises a valve needle 4 fitted in a valve hole 2 formed in the base end face of a valve body 1 and an injection port 7 which is opened to the front end face of the valve body 1 from a conical valve seat 3 formed in the front end part of the valve hole 2. Further, when fuel pressure which is fed into a swirl pressure chamber 8 from a supply passage 9 through a communication passage 10 in the tengential direction, is raised and therefore, the valve needle 4 is raised, overcoming a spring 6, fuel is injected from the fuel injection port 7. In this arrangement, a pin 11 is projectingly provided to the front end of the valve needle 4, in such a length that the needle 4 may be projected from the front end opening surface of the injection port 7 upon the valve opening. Estimating that the shaft diameter of the pin 11 is (d) and the bore diameter is D, the following expressions should be satisfied: 0.4mm.<=D<=2.0mm. and 0.5D<=d<=0.95D.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermittent spiral injection valve used in a fuel injection internal combustion engine such as a diesel engine, which atomizes fuel and intermittently injects it in a spiral shape.

This type of intermittent spiral injection valve has good atomization of fuel, and sprays the fuel particles in a substantially conical tube shape while swirling the fuel particles in a spiral or spiral shape. Therefore, since the spray angle is large, fuel particles may adhere to the walls of the combustion chamber or intake pipe of the internal combustion engine.
In order to prevent fuel particles from adhering to the wall surface, it is necessary to set the spray angle to an angle appropriate to the shape or size of the combustion chamber or intake pipe.

However, with conventional intermittent spiral injection valves, it is not possible to easily adjust the spray angle to a desired angle.

In addition, since the spray of fuel particles becomes a conical cylinder and a cavity is formed in the middle part, foreign substances such as carbon may enter the injection hole through this cavity and clog the injection hole. must be prevented from entering the injection hole. However, conventional intermittent spiral injection valves cannot prevent foreign matter from entering the injection hole.

In view of the conventional situation as described above, an object of the present invention is to provide an intermittent swirl injection system that can easily adjust the spray angle to a desired angle and that can prevent foreign matter from entering the injection hole. It's important to offer something.

1. In an intermittent spiral injection valve, the fuel flow passing through the injection hole flows in a cylindrical shape while swirling or spiraling along the inner peripheral surface of the injection hole. He came up with the idea of inserting a bottle through the tube. In this way, the fuel flow passing through the injection hole flows along the inner peripheral surface of the injection hole and also along the outer circumference of the bottle, resulting in a smaller spray angle than in conventional products without pins. The shaft diameter′? i: If you change it, the spray angle will change.

Furthermore, by inserting the bottle into the injection hole, the hollow portion of the cylindrical fuel flow passing through the injection hole is filled, thereby making it possible to prevent foreign matter from entering the injection hole.

In addition, the inventor of the present invention has found that when a pin is inserted into the injection hole in an intermittent type swirl injection valve, it functions satisfactorily as a swirl injection valve, and the spray angle becomes small due to the insertion of the bottle.
In order for the fuel flow to flow in a cylindrical shape while swirling or spiraling along the inner peripheral surface of the injection hole and the outer periphery of the pin, certain limits must be placed on the hole diameter of the injection hole and the axial diameter d of the bottle. (I noticed that from various experiments, taking into account the specifications of intermittent swirl injection valves used in internal combustion engines, the following is true: o, 4tm≦D≦20, sD≦d≦C51) I found the limit.

That is, in the present invention, a valve needle is slidably fitted into a valve hole provided in a valve body, and an injection hole is connected to a valve seat portion of the valve hole that the tip of the valve needle comes into contact with.
In an intermittent spiral injection valve that has a passage that supplies fuel to the injection hole in a spiral or spiral manner when the valve needle leaves the valve seat of the valve hole and opens the valve, a hole diameter is formed at the tip of the valve needle. A pin with a shaft diameter d that communicates with the injection hole is provided so as to protrude to a length that does not sink in from the tip opening surface of the injection hole even when the valve is opened.
The present invention is an intermittent spiral injection valve characterized by satisfying the relationship: s D≦d≦0.75D.

In the one-phase volute injection valve of the present invention, as is clear from the above description of the process leading up to the present invention, the spray angle can be set to a desired angle by changing the shaft diameter of the pin. Since the shaft diameter can be easily machined to a desired diameter, the spray angle can be simply set to the desired angle. The twisted pin can prevent foreign matter from entering the injection hole.

Next, examples of the present invention will be described.

First Embodiment (See Figures 7 to 1) The intermittent spiral injection valve of this example has a valve needle (4)' connected to a valve hole (2) formed in the base end surface of a valve body (1). i: Sliding fit, valve needle (4
) is in elastic contact with the proximal end surface of the helical spring (6), and a conical valve seat (3) on which the conical tip (5) of the valve needle comes into contact is provided at the tip of the valve hole (2). An injection hole (7) is provided that opens from the valve seat (3) to the distal end surface of the valve body (1), and an injection hole (7) is provided that opens from the valve seat (3) to the distal end surface of the valve body (1). An annular spiral pressure chamber (8) is formed in the valve body (1) located at the bottom of the valve body (1), and a spiral pressure chamber (8) is formed from the tip of a valley supply passage (9) bored in the base end surface of the valve body (1). ) is provided with a connection passage (1 (I) along the connection direction, and when the pressure of the fuel supplied to the swirl pressure chamber (8) via each supply passage (9) and each connection passage Oq rises, , the valve needle (4) separates from the valve seat (3) of the valve hole against the helical spring (6), and the tip of the valve needle (5
) and the valve seat part (3) of the valve hole, the spiral pressure chamber (8) communicates with the injection hole (7) through the perforation 5-1 to open the valve, and the supply passage (9), Connection passage 00. Fuel is supplied to the injection hole (7) in a spiral or helical manner when the valve is opened by the swirl pressure chamber (8) and the perforation between the tip (5) of the valve needle and the valve seat (3) of the valve hole. It constitutes a 1M road.

Furthermore, the tip (5) of the valve needle has a pin (Ql)e that extends concentrically through the injection hole (7) and protrudes from the opening surface of the tip of the injection hole (7) even when the valve is opened. Set the diameter of the injection hole (7) to 071 or more and 20 or less, and set the bottle 0υ
The shaft diameter d of the injection hole is set to be sO% or more and 9S% or less of the diameter of the injection hole.

In the intermittent spiral injection valve of this example, the spray angle is smaller than that of the conventional product without a bottle, and when the shaft diameter is larger or smaller, the spray angle becomes smaller or larger. Since it is very easy to machine the shaft diameter to the desired size, the spray angle can be easily adjusted to the desired angle.

Historically, the bottle prevents foreign matter from entering the injection hole.

Second embodiment (see Figures 5 and 6) 6- The intermittent spiral injection valve of this example is different from the injection hole (7) of the previous example.
The boat type uses a connection passage (II) provided in the valve body (1) to apply swirling force to the fuel supplied to the injection hole (7), while This is a screw type that uses a spiral groove αG provided on the valve needle (4) for the purpose of learning.Other points are the same or almost the same as those of the previous example, so Figures 5 and 6 are shown in Figures 5 and 6. The same reference numerals as in FIG. 1 are used to omit the explanation.

[Brief explanation of the drawing]

7 is a longitudinal cross-sectional view of an intermittent spiral injection valve according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line T in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line 11-1 in FIG. , FIG. 7 is a vertical cross-sectional view of the rotating intermittent type volute injection valve when the valve is opened, FIG. FIG. 2 is a longitudinal cross-sectional view of the rotating intermittent spiral injection valve when the valve is open. 1: Valve body 2: Valve hole 3: Valve seat 4: Valve needle 5: Tip 7: Injection hole 8: Swirl pressure chamber, pressure chamber 9: Supply passage 10: Connection passage, spiral groove 11: Bottle I) : Nozzle hole diameter d: Pin shaft diameter ■ N O Figure 5 Figure 6 Figure 5 11 7 3

Claims (1)

[Scope of Claims] A valve needle is slidably fitted into a valve hole provided in a valve body, an injection hole is connected to a valve seat portion of the valve hole which the tip of the valve needle comes into contact with, and the valve needle is inserted into the valve hole of the valve hole. In an intermittent spiral injection valve, which has a passage that supplies fuel in a spiral or threaded manner to the injection hole when the valve is opened by separating from the seat, the fuel is passed to the injection hole with a hole diameter at the tip of the valve needle. A pin with shaft diameter d is provided to a length that does not sink in from the tip opening surface of the injection hole even when the valve is opened, and Q, 4t sn≦D≦, 20 yxmO, S D≦d
An intermittent swirl injection valve characterized by satisfying the relationship: ≦095D.