JPS5916649Y2 - Combustor nozzle device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a nozzle device for a combustor that injects combustion gas into a burner.

As a type of combustor used in combustion-type hot air heaters, etc., there is a type of combustor that vaporizes liquid fuel such as kerosene and leads the vaporized gas from a nozzle device to a burner to burn it. To explain more specifically with reference, 1 is a flat carburetor integrally molded by aluminum die-casting, for example, a heater 2 and a vaporization pipe 3 are buried in parallel in this vaporizer 1, and this vaporizer A nozzle device 4 is installed near one end of the front surface of the container 1.

The nozzle device 4 includes a bulging protrusion 1 integrally formed with the vaporizer 1.
A cylindrical holder 5 is fitted into the holder 5, a needle valve 6 is slidably housed in the holder 5, a nozzle 7 is attached to the tip of the holder 5, and the nozzle 7 is attached to the end face of the bulging protrusion 1a. It will be exposed.

The needle valve 6 can be slidably operated from the outside via an interlocking mechanism 8 consisting of a rack and a pinion, and the ejection hole 7a of the nozzle 7 can be opened and closed by this operation.

The vaporizing pipe 3 communicates with the holder 5 of the nozzle device 4 at one end via the communication pipe 9, and the other end of the vaporizing pipe 3 is led out from the end face of the carburetor 1, and the oil supply pipe 10 is connected to the leading part. has been done.

One end of the fuel supply pipe 10 is immersed in the fuel in the fuel tank 11, and an electromagnetic pump 12 is provided in the middle, and a return pipe runs from between the pump 12 and the vaporizing pipe 3 toward the fuel tank 11. 13 have been derived.

At the front of the carburetor 1, there is a burner 14, which is formed into a flat shape by bonding and fixing a pair of symmetrical press-formed products to each other.
Attached via 5.15.

This burner 14 includes a cylindrical mixing tube 16 and a cylindrical mixing tube 16.
A wide diffusion section 17 that extends from one end at a right angle and expands into a wide shape, and a gas blowout section 19 that is configured by drilling a large number of slits in the upper end surface of this diffusion section 17. Become.

The opening end surface of the mixing tube 16 faces the nozzle 7, and the gas blowing part 19 is arranged along the longitudinal direction of the upper edge of the vaporizer 1.

Although not shown, the vaporizer 1 includes a thermostat that controls the heater 2 to keep the temperature of the vaporizer 1 constant, and an electromagnetic pump 12 that detects when the temperature of the vaporizer 1 reaches a constant level. Temperature sensing elements are respectively provided to energize the temperature sensing elements.

Further, 22 is a filter inserted into the vaporizing pipe 3.

In the combustor configured as described above, the heater 2 is energized by turning the operation dial, the reheater 2 generates heat, and the carburetor 1 is gradually preheated.

When the temperature reaches the fuel vaporization temperature of 250 to 280 degrees Celsius, it is detected by the temperature detection element, and in response, the electromagnetic pump 12 is started and the pressurizing force is applied to the fuel tank 1.
1 is sequentially supplied into the vaporization pipe 3 from the fuel supply pipe 10.

Since the vaporization pipe 3 has already reached the vaporization temperature of the fuel, the fuel is sequentially vaporized in this pipe 3 and becomes vaporized gas.

This vaporized gas then reaches the inside of the holder 5 through the communication pipe 9, and flows through the mixing pipe 16 of the burner 14 from the ejection hole 7a of the nozzle 7, which has been opened in advance by the operation dial.
Squirt inside.

Due to the jet effect accompanying this ejection, primary air for combustion is sucked into the mixing tube 16 along with the vaporized gas, and both of them are mixed while flowing in the mixing tube 16 to form a mixed gas, and this mixed gas is mixed into the diffusion section 17. The gas diffuses into the air, blows out from the gas blowing section 19, and is ignited and burned.

By the way, in this type of combustor used in hot air heaters and the like, it is desired that the combustion power can be adjusted to be strong or weak.

There are two ways to adjust this: one is to control the pressurizing force of an electromagnetic pump, and the other is to change the passage area of the nozzle.
In the former case, accurate control is difficult, and various control parts and complicated electric circuits are required, resulting in high costs.

On the other hand, the latter method has the advantage that the adjustment can be achieved relatively easily and at low cost, and for this reason, this latter method is most often adopted.

This latter adjustment means, as shown in FIG. The flow rate of vaporized gas is controlled by changing the open area of the combustion chamber, and the combustion state is switched between strong and weak states through this control.

According to such an adjustment means, as shown by the curve A in FIG. 6, the extinguishing mode changes from strong to weak at certain stages depending on the amount of rotation of the operating dial.

However, there is often a misalignment between the operation dial and the needle valve 6 due to variations in assembly or the like.

Therefore, in the case where the combustion state constantly changes depending on the amount of movement of the needle valve 6 as described above, even if the operating dial is operated within a certain range, the combustion state will differ for each individual.

In other words, even if the operation dial was set to low combustion according to the value indicated on the nameplate, the low combustion power would not be as specified, resulting in a lack of reliability.

This idea was made with attention to these points, and its purpose is to maintain a weak combustion state according to specifications even if there are errors due to assembly variations between the operation dial and the needle valve. An object of the present invention is to provide a combustor nozzle device that can be set.

An embodiment of this invention will be described below with reference to FIGS. 3 to 5.

In this embodiment, the same reference numerals are given to the same components as those described above, and detailed description thereof will be omitted.

In FIG. 3, reference numeral 21 denotes an operation dial, and by rotating the operation dial 21, the needle valve 6 in the holder 5 can be moved in its axial direction.

That is, a rack 8a is formed at the rear end of the needle valve 6, a pinion 8b meshes with the rack 8a, a main shaft 22 of the pinion 8b projects from the holder 5, and an operation dial 21 is attached to the projecting end. It is.

As shown in FIG. 4, the nozzle 7 provided at the tip of the holder 5 has a large-diameter inflow hole 7 located on the inner side of the holder 5.
b is located on the opposite side, that is, on the tip side, and an ejection hole 7a is formed, and these inflow holes 7b and ejection holes 7
A tapered hole 7C is formed between the hole 7C and the hole 7C, which constitute a series of passages.

Furthermore, a flat part 23 and a jet regulating part 24 are formed in the jet hole 7a with a step as a boundary.

The flat portion 23 is adjacent to the tapered hole 7C, has a constant length l, and has a uniform diameter over its entire length.

The jet regulating portion 24 is formed to be smaller in diameter than the flat portion 23.

The needle valve 6 has a shutoff portion 6 that is tapered toward the tip.
b, and an adjustment rod 25 is further provided protruding from the tip of this blocking portion 6b.

The adjustment rod 25 is sufficiently longer than the length l of the bracket portion 23 and has a diameter smaller than the diameter of the flat portion 23.

A tapered portion 25a having an angle corresponding to the tapered hole 7C is formed at the tip of the adjustment rod 25.

In addition, the base 6C of the needle valve 6 is as shown in FIG.
For example, it is formed to have a rectangular cross section, and each edge of the holder 5
The flat surfaces 6d... and the inner peripheral surface of the holder 5 form a flow path for vaporized gas.

When the needle valve 6 is moved rearward via the operation dial 21 and the flat part 23 is opened wide, a certain amount of vaporized gas is ejected from the nozzle 7 according to the hole diameter of the ejection regulating part 24. , a constant strong combustion continues.

When the needle valve 6 is moved forward from this state, the tapered part 25a of the adjustment rod 25 first enters into the opening of the flat part 23, and the opening area of the flat part 23 decreases in accordance with the entry, and the vaporized gas The amount of distribution will be gradually reduced.

After the tapered part 25a completely enters the flat part 23, the flat part 23 has a uniform diameter and a length l, so the vaporized gas is restricted to a constant amount regardless of the movement of the tapered part 25a. It spews out from the nozzle 7 while remaining
This allows weak combustion to continue at a constant rate.

Then, when the needle valve 6 is further operated to move, the taper portion 25a enters into the ejection regulating portion 24, and
The blocking portion 6b abuts against the opening of the inflow hole 7b, thereby blocking the ejection of vaporized gas, thereby stopping the combustion, that is, extinguishing the fire.

If such a process is represented in a diagram, it becomes a curved line in FIG.

As is clear from this figure, a section opening' is formed in which weak combustion with a constant heating power continues regardless of the operating operation of the operating dial 21.

Therefore, as long as the operation dial 21 is set within a range having a certain width, a weak combustion state with a constant firepower can always be obtained.

Therefore, even if there are errors due to variations in assembly between the operation dial 21 and the needle valve 6, it is possible to always set the weak combustion according to specifications.

In addition, in the above explanation, we have taken as an example the case where liquid fuel is vaporized and the vaporized gas is used as combustion gas, but it is not limited to such gas, but can also be used with natural gas, city gas, propane gas, etc. There is no problem.

Further, in the above embodiment, the ejection regulating part 24 that regulates the maximum ejection amount of gas was made smaller in diameter than the flat part 23, but it is made the same diameter as the flat part 23, and the gas is cut off by the cutoff part 6b of the needle valve 6. You may also do it by yourself.

As explained above, according to this invention, even if there is an error between the operation dial and the needle valve due to assembly variations, it is absorbed by the flat part of the nozzle and the result is always in accordance with specifications. It can be set to a weak combustion state.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view showing a general combustor, Figure 2
The figure is an enlarged sectional view of the nozzle device of the combustor, and FIG. 3 is a sectional view of the nozzle device according to an embodiment of the invention.
Fig. 4 is an enlarged sectional view of a part of the device, Fig. 5 is a sectional view taken along the line ■-■ in Fig. 3, and Fig. 6 shows the relationship between the amount of rotation of the operation dial and the amount of combustion. FIG. 5...Holder, 6...Needle valve, 7
...Nozzle, 7a...Blowout hole, 23.
...Flat part, 25...Adjustment rod.

Claims (1)

[Scope of utility model registration request] A nozzle having a gas ejection hole is provided at the tip of the holder into which combustion gas is introduced, and the ejection hole has a constant length and a flat portion with a uniform diameter is formed along its entire length,
A needle valve is slidably housed inside the holder, and an adjustment rod with a smaller diameter than the flat part and a tapered tip is protruded from the tip of the needle valve, and the adjustment rod is inserted into the flat part. A nozzle device for a combustor, characterized in that the amount of gas ejected is controlled by inserting the nozzle device through the nozzle device.