JPS643961Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an oil burner used in hot air blowers, etc., and in particular, the invention relates to a pump that supplies fuel under pressure and an air supply fan that supplies combustion air under pressure. Regarding the oil burner provided.

(Conventional technology) Conventionally, as this type of oil burner,
The one disclosed in Japanese Patent No. 77212 is already known. In this system, an air chamber communicating with the atmosphere is defined facing the intake port of the fan case, and the air sucked from this air chamber is pressurized by an air supply fan and sent to the combustion section.

(Problem that the invention aims to solve) As mentioned above, for example, when indoor air is sucked in and supplied under pressure, depending on the usage environment, floating dust in the air may enter the combustion section along with the air. This may cause abnormal combustion, such as yellow combustion. In addition, dust sometimes adhered to the air supply fan and solidified, degrading its performance.

In order to solve these problems, it is recommended to introduce combustion air through an intake air filter, for example. However, in this case, if the supply air filter becomes clogged, or if the filter is accidentally blocked by a curtain or the like, serious malfunctions such as the generation of black smoke may occur.
In other words, since fuel is supplied under pressure at the same time as the combustion air, if there is a shortage of air supply, the fuel will immediately become excessive and an abnormal combustion state will occur.

The present invention solves the above-mentioned problems.Firstly, it is possible to always supply clean fuel air with the intake air filter, and even if an abnormality occurs in the intake air filter, To secure the air necessary for combustion and to prevent abnormal combustion due to insufficient air supply. Second, when the intake air filter is normal, it is possible to prevent air from flowing in from the air intake path that functions when the filter is abnormal, thereby ensuring stable combustion.

(Means for Solving the Problems) Therefore, the present invention is designed to prevent air from flowing toward the outlet 37 of the intake air filter 32 in order to secure the air necessary for combustion when the intake air filter 32 falls into an abnormal state. An air reservoir 40 is recessed in the bottom wall 23a of the chamber 22, and an auxiliary air supply port 41 communicating with the atmosphere is opened in this recess. Further, the inner edge of the air supply port 41 is surrounded by a blocking wall 42 rising upward.

(Function) Due to this, in the present invention, the auxiliary air supply port 41
is in communication with the atmosphere, so the supply air filter 32
If clogging or the like occurs, air is immediately sucked in from the auxiliary air supply port 41 side by the suction action of the air supply fan 5, and the amount of air necessary for combustion is secured. on the other hand,
When the function of the air supply filter 32 is normal, the interaction between the air pocket 40 and the blocking wall 42 prevents inflow from the auxiliary air supply port 41. In other words, the air chamber 22
Since the part facing the outlet 37 of the air supply filter 32 inside the air chamber 22 is recessed to form an air pocket 40, the passage cross-sectional area here is larger than the passage cross-sectional area of other parts in the air chamber 22, and the intake air is reduced by that much. The air flow rate decreases,
Suction pressure decreases (pressure approaches atmospheric pressure). Also,
Since the intake air is sucked diagonally across the inside of the air chamber 22, the effect of the suction pressure of the intake air flow is difficult to reach by recessing the air pocket 40, and in addition to the cross-sectional area effect, the air pocket By increasing the pressure at 40, it is possible to prevent air from flowing in from the auxiliary air supply port 41. At this time, the blocking wall 42 prevents the internal and external pressures of the air pocket 40 from changing suddenly, and reliably prevents outside air from flowing in.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In Figure 3, the oil burner is located at the base 1 of the machine.
A tank-shaped oil pan 3 fixed on top via a base frame 2
is used as a basic structure, and a combustion section 4, an air supply fan 5, and a motor 6 are arranged in order from the top on the upper part, and a fuel supply pump 7 is arranged near the inner bottom.
The fan 5 is configured to be driven simultaneously by a drive shaft 8 protruding from both upper and lower sides of the motor 6. A float switch 9 for detecting the liquid level of fuel and an oil filter 10 that also serves as a mouthpiece holder are attached to the oil pan 3. A cartridge type oil tank 11 is placed in an inverted position on this oil filter 10.
is installed.

A pump support cylinder 13 is fixed to the lower surface of the motor 6, and a pump case 14 is formed by this and a cap fixed to the lower end thereof, and a centrifugal rotor 15 is housed inside the pump case 14, so that the pump 7 can be operated. It is configured. 16 is a suction port, and 17 is a leak hole. The outer surfaces of the pump 7 and the pump support tube 13 are covered with a filter 18, and the filtered fuel is sucked into the pump 7 through a window hole and a suction port 16 opened on the inner surface of the pump support tube 13. After being pressurized by the rotor 15, the fuel is sent to the carburetor 20 via a fuel passage 19 that runs longitudinally through the drive shaft 8.

Above the motor 6 are an air supply case 23 that partitions the air chamber 22, a fan case 24 that accommodates the fan 5, and an upper case 25 that accommodates the carburetor 20.
and are fixed one on top of the other in order. Further, a flame port 27 is provided at the upper part of the vaporizer 20 via a buttful 26.
However, combustion tubes 28 are fixed to the upper part of the upper case 25 so as to surround the flame port 27. An air supply port 29 communicating with the inside of the fan case 24 is formed in the upper center of the air chamber 22 . The air sucked in from the air supply port 29 is pressurized by the fan 5 and sent into the vaporizer 20, where it is blown out from the spray nozzle 30 at the upper end of the fuel path 19 and mixed with the vaporized fuel. This air-fuel mixture burns while passing through the flame port 27.

This invention is characterized in that, in the oil burner as described above, the air supply system path from the air supply filter 32 attached to one side of the circumferential surface of the air supply case 23 to the intake port 29 is configured as follows. There is.

In FIG. 1, an air supply port 33 is opened in the peripheral wall of the air supply case 23. As shown in FIG. And this air supply port 3
3 is equipped with an air supply filter 32. The air supply filter 32 consists of a filter case 34, a cap 35 that removably closes the outer opening of the filter case 34, and a mesh-shaped filter member 36 attached to the opening at the tip of the cap 35. Filter case 3
4 is fixed to the air supply case 23 with screws 38 inserted through both ends of the outlet 37. In this fixed state,
The lower edge of the outlet 37 is the bottom wall 23a of the air supply case 23.
The relative dimensions of the filter case 34 and the air supply case 23 are determined so that the filter case 34 and the air supply case 23 are located lower.

An air pocket 40 is formed by recessing the bottom wall 23a of the air supply case 23 facing the outlet 37 of the air supply filter 32 downward. Furthermore, elongated hole-shaped auxiliary air supply ports 41 are formed at two locations on the front and back of the bottom wall 40a of the air reservoir 40. The auxiliary air supply port 41 is formed by burring, and its inner edge side, that is, the side of the air pocket 40, is formed by a blocking wall 42 that rises upward.
surrounded by. The height of the upper end of the shielding wall 42 is determined to be equal to or lower than the lower edge of the air supply port 33.

In FIG. 3, reference numeral 1a denotes a main body case, and an air supply filter 32 is attached to the case 1a with a cap 35 exposed to the outside of the machine body. Reference numeral 40b in FIGS. 1 and 2
is the inner wall.

With the above configuration, clean combustion air that is normally filtered by the air supply filter 32 can be fed to the combustion section 4, and abnormal combustion caused by dust contained in the air can be prevented. During this steady operation, intake air flows diagonally from the outlet 37 toward the intake port 29. At this time, in the air pocket 40 that is recessed one step from the bottom wall 23a of the air supply case 23, the passage cross-sectional area is larger than other parts of the air chamber 22, so the part facing the air pocket 40 has a larger passage area. The flow rate of suction air decreases, and the suction pressure decreases. Furthermore, the effect of negative pressure is alleviated by the distance that the air pocket 40 is recessed. Further, a part of the suction air flowing in from the outlet 37 hits the inner wall 40b of the air pocket 40 due to its own kinetic inertia, is guided by the wall 40b, reverses, and swirls in the air pocket 40 to become uniform. This creates a high-pressure zone that is stratified from the suction airflow of the current. At this time, the blocking wall 42 surrounding the auxiliary air supply port 41 prevents the reversed flow from flowing out. At the same time, the blocking wall 4
2 prevents the pressure difference between the inside and outside of the air reservoir 40 from changing suddenly and prevents external air from flowing in.

As described above, due to the interaction between the air pocket 40 and the blocking wall 42, a high-pressure zone approximately equal to atmospheric pressure is formed in the air pocket 40, so that the air supply filter 3
When combustion air is sucked in from the auxiliary air supply port 41, no external air flows in from the auxiliary air supply port 41.

On the other hand, if the air supply filter 32 becomes clogged,
For example, when a curtain closes the opening of the cap 35, the negative pressure within the air chamber 22 increases rapidly. On the other hand, the suction air flow from the outlet 37 is little or only limited. Therefore, no high-pressure zone is formed in the air pocket 40, and combustion air is sucked through the auxiliary air supply port 41. Therefore, abnormal combustion caused by insufficient air can be prevented.

Note that the air supply case 23 has a cyclone-type dust separation function, and it sucks out dust that adheres to the outlet 37 etc. when cleaning the filter member 36 and minute dust that cannot be separated by the filter member 36. It is possible to separate the dust by utilizing the kinetic inertia of the time, and to trap the separated dust mainly on the side of the half circumferential wall facing the air supply port 33.

(Another Embodiment) This invention may be implemented by changing a part of the above embodiment as follows.

B. The air supply case 23 and the fan case 24 are arranged at a distance, and both 23 and 24 are communicated with each other through an air supply passage.

(b) The auxiliary air supply port 41 is formed by two or more louver-shaped openings.

C. The shielding wall 42 is made separate from the air supply case 23.

D. An indicator is provided to indicate that the air supply filter 32 is clogged.

In addition to the above, this invention also assumes a case where the motor 6 is housed in the air supply case 23, and is not limited to the above embodiment.

(Effect of the invention) As explained above, according to this invention, the air supply filter 32 attached to the air supply port 33 of the air chamber 22
Although clean combustion air can always be supplied to the combustion section 4, if the air supply filter 32 becomes clogged or is blocked by a curtain, etc., the air supply case 23 Air is sucked in through an auxiliary air supply port 41 provided in the combustion chamber, thereby ensuring the air necessary for combustion. This allows Juan 5
Although the pump 7 is used to forcibly supply air and fuel, even if the air supply filter 32 falls into an abnormal state, abnormal combustion due to insufficient air supply is prevented and normal combustion is always maintained. It can be performed. Furthermore, when the function of the air supply filter 32 is normal, a high-pressure zone approximately equivalent to atmospheric pressure is formed in the air pocket 40 due to the interaction between the air pocket 40 and the blocking wall 42. , suction of air from the auxiliary air supply port 41 can be prevented, and stable combustion can be ensured.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with Fig. 1 being a cross-sectional view showing the main structure of the air supply system, and Fig. 2 being a cross-sectional view showing the main structure of the air supply system.
A line sectional view and FIG. 3 are longitudinal sectional views showing a schematic structure of the oil burner. 5...fan, 7...pump, 20...carburizer, 22...air chamber, 23...air supply case, 23
a...bottom wall, 27...flame port, 29...intake port, 3
2...Air supply filter, 37...Outlet, 40...Air reservoir, 40a...Bottom wall, 41...Auxiliary air supply port,
42...Closing wall.

Claims (1)

[Scope of utility model registration request] an air supply fan 5 that supplies combustion air under pressure;
The oil burner includes a pump chamber 7 that supplies fuel under pressure, mixes vaporized fuel and combustion air in a vaporizer 20, and burns the mixture in a flame port 27 provided at an outlet of the vaporizer 20. An air chamber 22 communicating with the intake port 29 of the air chamber 22 is defined below the air chamber 22, an air supply filter 32 is fixed to the peripheral wall of the air chamber 22, and a bottom wall 23a of the air chamber 22 facing the outlet 37 of the air supply filter 32 is fixed to the peripheral wall of the air chamber 22. A recessed air pocket 40 is formed, an auxiliary air supply port 41 is opened in the bottom wall 40a of the air pocket 40, and the inner edge of the auxiliary air supply port 41 is surrounded by a blocking wall 42 rising upward. Characteristic oil burner.