JPS6312874A - Two kind fluid injection valve - Google Patents

Abstract

PURPOSE:To improve the atomizing performance of fuel and the combustion performance, by arranging two sump sections for storing one of fuel oil and atomizing fluid between a valve rod and the inner face of a guide tube for sliding and guiding said valve rod, and between the outer face of the guide tube and a valve box. CONSTITUTION:Atomizing fluid (air, steam, hot water, etc.) is fed by a pump through a path 9 to a fluid sump section 10 at the outer circumference of a guide tube 3, while fuel oil is fed by a pump through a feed path 17, a supply hole 16 and a path 7 to a fuel sump section 8 at the inner circumference of the guide tube 3. When the pressure of fuel oil rises above a predetermined level at a specific rotary angle of engine so as to push up a valve body 5, the oil sump section 8 and a groove 12 are opened simultaneously to a conical hole 14. Consequently, the fuel oil flows out in the axial direction and guided through the groove 12 so as to collide against the atomizing fluid flowing in the radial direction in the conical hole 14 and mixed therewith, thereafter injected through an injection hole 15 into a fuel chamber 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dual fluid injection valve that simultaneously sprays fuel oil and an atomizing fluid such as steam or high-pressure hot water into the combustion chamber of a diesel engine.

[Prior Art] Diesel engines are known in which an atomizing fluid is injected from an injection valve into a combustion chamber together with fuel oil in order to promote atomization of fuel oil and improve combustion performance.

Conventionally, high-pressure air has been used as the atomizing fluid, and the two-type fluid injection valve will be explained based on FIG. 6.

That is, 50 is a valve box of an injection valve, and is attached to a cylinder cover 51 of a diesel engine.

Reference numeral 52 denotes a guide cylinder fitted into the valve box 50, which slidably guides the valve stem 53. A conical valve body 5 is provided at the tip of the valve stem 53.
4 is formed.

An atomizing device 55 is provided between the outer surface of the guide tube 52 and the valve box 5o, and this atomizing device 55 is connected to the small hole 56.
It is suitable to form disks 57 formed by overlapping each other with a gap in the axial direction.

58 is a fuel oil passage formed in the valve box 50, 59 is a compressed air passage formed between the outer surface of the f-id cylinder 52 and the valve box 50, and these passages 58 and 59 are connected to the atomizer 5.
5 are gathered at the upstream end.

The downstream end of the atomizer 55 communicates with a conical hole 61 of a valve seat 60, and the valve body 54 is removably seated in this conical hole 61. The conical hole 61 communicates with an injection hole 62, which opens into a combustion chamber 63 of the diesel engine.

Note that 64 is a check valve that allows fuel oil to pass only in the direction of the atomization device 55.

In the injection valve having such a configuration, fuel oil is supplied from a fuel pump (not shown) through the check valve 64 and the oil passage 58 at a predetermined time of each rotation of the engine, and this fuel oil is supplied to the downstream end of the air passage 59. It is placed on the upstream end of a certain atomizer 55.

On the other hand, compressed air pressurized to a pressure higher than at least the maximum pressure of the combustion chamber 63 is supplied to the air passage 59 from a compressor (not shown).

When the valve stem 53 is lifted by the action of a cam (not shown) that operates in synchronization with the rotating shaft of the engine, the valve body 54 separates from the valve seat 60, and at this time the compressed air flows through the atomizer 55 and It passes through the conical hole 61 and flows out into the combustion chamber 63 through the injection hole 62 . At this time, the compressed air pushes out the fuel oil on the atomizer 55 at high speed, and the small holes 56 of each disc 57...
The fuel oil is made fine by repeatedly expanding and contracting during the process of passing through the fuel oil, and the fine fuel is injected from the injection hole 62 into the combustion chamber 63.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional two-type fluid injection valve,
When air and fuel oil are mixed, the fuel oil is stationary at the upstream end of the atomizer 55, so the overall kinetic energy is low and the atomization performance is low.

Furthermore, if high-temperature steam that promotes vaporization through heating is used as the atomizing fluid, the fuel oil that is stationary at the upstream end of the atomizer 55 will be exposed to the steam, resulting in deterioration of the quality of the fuel oil. There is also a risk that the steam will liquefy and accumulate in the atomizer 55 as drain.

Furthermore, the structure of the atomizing device 55 is complicated and expensive.

In the present invention, the atomization performance is improved by giving a large amount of kinetic energy to the fluid, and even when steam or high-pressure hot water is used as the atomization fluid, the quality of the fuel oil is not changed. The present invention aims to provide a two-type fluid injection valve with a simple structure.

[Means for Solving the Problems] In the present invention, there is provided a first tube in which either fuel oil or atomizing fluid is stored between the inner surface of the guide cylinder that slidably guides the valve stem and the valve stem. A second reservoir is provided between the outer surface of the guide cylinder and the valve box in which the other of the fuel oil or the atomizing fluid is stored, and the second reservoir is formed on the distal end surface of the guide cylinder. A groove is formed that communicates with the reservoir and extends from the outer periphery toward the center, and when the valve body connected to the valve stem is seated on the valve seat, both the groove and the first reservoir are closed, and the valve body is lifted. The present invention is characterized in that when the fuel oil and the atomizing fluid are mixed, these grooves and the second reservoir are simultaneously opened and the fuel oil and the atomizing fluid are injected through the injection hole.

[Function] According to the present invention, fuel oil and atomizing fluid are stored separately in the first reservoir section and the second reservoir section, respectively, and under a pressure higher than the maximum pressure of the cylinder. When the valve body at the tip of the valve stem lifts from the valve seat, the fuel oil and atomizing fluid are mixed at the valve seat and injected through the injection hole.
A large amount of kinetic energy can be obtained by being able to utilize the kinetic energy of both fluids.

In addition, since the groove formed at the tip of the guide cylinder goes from the outer periphery to the center, it is possible to generate a swirling flow or a stirring flow by selecting the direction and flow path area of one of the fluids flowing through the groove. Therefore, mixing performance can be improved and atomization can be promoted.

Moreover, it is simpler than the conventional structure.

[Embodiments of the Invention] The present invention will be described below based on a first embodiment shown in FIGS. 1 to 3.

In FIG. 1, l is a valve box, 2 is a cylinder cover, 3 is a guide cylinder, 4 is a valve stem, 5 is a conical valve body, and 6 is a combustion chamber of the engine.

A fuel oil passage 7 is formed between the outer surface of the valve stem 4 and the inner surface of the guide cylinder 3 by providing an axial slit in the valve stem 4. The lower end forms a fuel reservoir 8 (first reservoir).

A passage 9 for atomizing fluid, such as air, steam, or hot water, is formed between the outer surface of the guide tube 3 and the inner surface of the valve box 1. The lower end of this passage 9 is a fluid reservoir ro (second (reservoir).

Fuel oil and atomizing fluid each having a pressure higher than the maximum pressure of the cylinder are separately stored in each of the fuel reservoir 8 and the fluid reservoir IO.

The valve body 5 is automatically pushed up by this pressure when the fuel pressure in the fuel reservoir 8 exceeds a predetermined pressure, which is higher than the maximum pressure of the cylinder. The upper end of 4 is in contact with a pressing rod 11, and this pressing rod 11 is urged downward by a spring (not shown).

As shown in FIGS. 2 and 3, a plurality of @12 are formed on the lower end surface of the guide tube 3, extending from the outer periphery toward the center. In this embodiment, the grooves 12 are formed to be inclined in the tangential direction. The outer ends of these grooves 12 communicate with the atomizing fluid reservoir 10, and the inner ends thereof open into the conical seat surface I3.

When the valve body 5 is seated on the conical seat surface I3, the inner ends of these 812 are closed by the valve body 5. When the valve body 5 is seated N on the conical seat surface 13, the fuel reservoir 8 closes the conical hole 14 and the conical hole 14 closes the injection hole 1.
5... is familiar.

Note that the fuel oil passage 7 is provided through a supply hole I formed in the guide cylinder 3.
6 to a fuel oil supply passage 17 formed in the valve box 2.

The operation of the embodiment with such a configuration will be explained.

A pump (not shown) supplies atomizing fluid to the fluid reservoir 10 through the passage 9. When the valve body 5 is seated, the inner ends of the grooves 12 are closed, so the fluid in the fluid reservoir 10 is maintained at a pressure (pump pressure) higher than the maximum pressure of the cylinder.

On the other hand, the fuel oil pumped by the fuel pump is supplied to the supply passage 1.
7. The fuel is supplied from the passage 7 to the fuel reservoir 8 via the supply hole 16. The fuel oil is compressed to a high pressure at a specific rotation angle of the engine, and when this reaches the valve opening pressure of the valve body 5 or higher, the valve body 5
is pushed up.

Then, the valve body 5 separates from the valve seat surface 13, so that the fuel reservoir 8 and the groove 12 are simultaneously opened to the conical hole I4.

As a result, the fuel oil flows in the axial direction, but the atomizing fluid is guided by the groove I2 and flows toward the center so as to intersect with the axial direction, so that the fuel oil and the atomizing fluid flow through the conical hole. 14, which gives agitation to the fuel oil.

Since the grooves 12 in this embodiment are inclined in the tangential direction, a swirling flow is generated within the conical hole 14.

Therefore, the fuel oil and the atomizing fluid mix in the conical hole I4,
This mixed fluid is injected into the fuel chamber 6 from the injection hole 15.

When the pressure inside the fuel reservoir 8 drops below the valve opening pressure, the valve body 5
The fuel tank 8 is lowered and is seated, thereby closing the fuel reservoir portion 8 and the groove I2. This ends the injection.

According to this embodiment, the fuel oil and the atomizing fluid are stored at high pressure in the mutually independent reservoirs 8 and 10, and are mixed at the same time as the valve body 5 is lifted. Mixing and injection are performed using kinetic energy, improving mixing performance and atomization characteristics.

Moreover, the atomizing fluid passes through the conical holes 14 through the grooves 12...
Since it is discharged into the conical hole 14, a stirring flow and a swirling flow are generated, which, together with the above-mentioned kinetic energy, provides extremely good mixing properties.

Further, since the grooves 12 . . . only need to be formed by cutting slits on the bottom surface of the guide tube 3, the processing is easy and the shape selection is also easy. Therefore, the structure is simpler than conventional atomization devices.

Further, since the fuel reservoir 8 and the atomizing fluid reservoir 10 are independent from each other, even if steam is used as the atomizing fluid, it will not liquefy and there is no fear of deterioration of the fuel oil. Therefore, it becomes possible to promote atomization of fuel oil using the thermal energy of steam.

FIGS. 4 and 5 show a second embodiment of the present invention, which differs in that the grooves 20 formed on the lower surface of the guide cylinder 3 are in the radial direction.

In the above embodiment, the fuel oil reservoir 8 was formed inside the guide tube 3 and the atomization fluid reservoir 10 was formed outside. In addition to providing a reservoir for atomizing fluid, a reservoir for fuel oil may also be formed on the outside.

[Effects of the Invention] As explained above, according to the present invention, fuel oil and atomizing fluid are mixed and injected by the kinetic energy of both, so the kinetic energy is large and good atomization is possible. Moreover, since these two fluids are kept separate until they are mixed, there is no possibility of deterioration of the fuel oil. The groove formed at the lower end of the guide cylinder promotes agitation and swirling of the fluid passing through the groove, which improves mixing performance and provides advantages such as a simple configuration.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is an overall sectional view, FIG. 2 is a sectional view of the lower end of the guide cylinder, and FIG. 3 is a T [ 4 and 5 show the second embodiment of the present invention, FIG. 4 is a sectional view of the lower end of the guide tube, and FIG. FIG. 6, which is a view taken along the v-v line, is a sectional view showing a conventional structure. DESCRIPTION OF SYMBOLS 1... Valve box, 2... Cylinder head, 3... Guide tube, 4... Valve stem, 5... Valve body, 7... Passage, 8
... Fuel oil reservoir, 9... Passage, 10... Atomizing fluid reservoir, 12°20... Groove, 13... Valve seat, 1
4... Conical hole, 15... Injection hole. Applicant's agent Patent attorney Takehiko Suzue No. 1 Figure 1i2 Figure @ Figure 4 Figure 3rg Figure 5 1i6

Claims (1)

[Claims] In an injection valve that simultaneously injects fuel oil and atomizing fluid, a guide tube that slidably guides the valve stem is provided inside the valve box, and the fuel oil is inserted between the inner surface of the guide tube and the valve stem. Alternatively, a first reservoir is formed in which one of the atomizing fluids is stored, and a second reservoir is formed between the outer surface of the guide cylinder and the valve box in which the other of the fuel oil or the atomizing fluid is stored. A groove is formed in the tip surface of the guide cylinder that communicates with the second reservoir and extends from the outer periphery toward the center, and when the valve body connected to the valve stem is seated on the valve seat, the center of the groove is formed. A two-type fluid injection valve characterized in that both a side opening end and a first reservoir are closed, and when the valve body is lifted, both the first reservoir and the groove are opened.