JPS6227328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improving the fire extinguishing performance of a pressure spray burner.

[Conventional technology]

Conventional pressure spray burners are supplied with fuel at a set pressure from the start of combustion, so they often make abnormal combustion noises when ignited or cause backfire. Some have improved the above problem by installing a pressure damper to gradually increase the fuel pressure applied to the spray nozzle.

However, with this configuration, when the fuel pressure pump is stopped when extinguishing a fire, fuel is supplied from the pressure damper to the spray nozzle instead of the fuel pressure pump, resulting in extremely poor firefighting performance, and even after the fire is extinguished, fuel continues to flow from the spray nozzle. There were many problems, such as dripping, fuel accumulating in the combustion chamber and abnormal combustion during the next combustion, and fuel adhering to the spray nozzle turning into tar and clogging the nozzle.

In order to solve this problem, Japanese Patent Application Laid-Open No. 51533/1983 proposes using a switching type solenoid valve to prevent the fuel in the pressure damper from flowing into the pipe during extinguishing.

[Problem that the invention seeks to solve]

The above proposal installs a pressure damper in the pipeline between the fuel pressurization pump and the spray nozzle, and also installs a switching type solenoid valve in the pipeline from the connection part of the pressure damper to the spray nozzle. The solenoid valve opens the line to the spray nozzle for normal combustion, while when the burner stops, the switching type solenoid valve closes the line to the spray nozzle and opens the return line instead, opening the pressure damper. The purpose is to send the fuel pushed out during return to the return path to prevent dripping from the spray nozzle.

However, switching type solenoid valves are larger in size and are extremely expensive parts than open/close type solenoid valves, and even with the use of these expensive parts, it has not been possible to completely prevent dripping from the spray nozzle.

In other words, when the fuel pressure pump is stopped, the fuel pressure (normally 7 kg/cm ² ) is high in the entire pipe leading to the spray nozzle, and even if a switching type solenoid valve is installed, the pipe leading from the valve part of the solenoid valve to the spray nozzle is heated. The combustion pressure cannot be released, and the fuel compressed in this pipe is sent out from the spray nozzle into the combustion chamber, causing dripping. Furthermore, the spray nozzle, which had been cooled by the air flow and fuel flow and kept at a low temperature, is heated by the still high combustion chamber temperature after combustion has stopped, while the pipe is filled with fuel up to the spray nozzle. As the temperature rises, the fuel increases in volume, and this increased fuel is forced out of the spray nozzle and turns into tar at the tip of the spray nozzle due to the high temperature in the combustion chamber, causing nozzle clogging. The problem was that the spray angle changed.

[Means for solving problems]

As mentioned above, in order to improve the fire extinguishing performance of a pressure spray burner, simply closing the pipeline with a solenoid valve is not the fundamental solution. It is necessary to This invention uses a pressure damper mechanism to ensure stable combustion when ignited, and when extinguishing, creates negative pressure in the pipe leading to the spray nozzle and sucks air from the spray nozzle to prevent fuel from dripping from the spray nozzle. It is.

To explain the specific structure using a diagram, 1 is a fuel pressure pump, 2 is a spray nozzle, and 3 is a pipe line, and the fuel pressurized by the pressure pump 1 is sent to the spray nozzle via the pipe line 3. 2 is supplied to the combustion chamber 8 in the form of mist, and is ignited and burned by the spark from the ignition electrode 9. 5 is a pressure damper installed through the connecting pipe 5' of the pipe 3, and 4 is a check valve installed on the connecting pipe 5'.The check valve 4 is opened by the flow of fuel in the pipe 3 to reduce the pressure. Damper 5 operates. 6 is a damper piston of the pressure damper 5, 6' is a compression spring, 7 is a cylinder that opens to the pipe line 3, 10 is a piston provided in the cylinder 7, and the piston 10 is driven by the damper piston 6 of the pressure damper 5. Ru. Therefore, when the volume of the pressure damper 5 becomes large, the piston 1
0 is pressed to reduce the volume of the cylinder 7, and when the pressure damper 5 returns to reduce the volume, the piston 10
The cylinder 7 volume is expanded.

12 is an outflow pipe attached to the pressure damper 5, which has the function of releasing the pressure of the pressure damper 5 and the pressure of the compression spring 6 housing part of the pressure damper 5, and is connected to the suction side of the fuel pressurizing pump 1. . Reference numeral 11 denotes an orifice attached to the outflow pipe 12 of the pressure damper 5, and a variable mechanism is attached as necessary. 13
1 is a blower for supplying combustion air, 14 is a heat exchange chamber connected to the combustion chamber 8, and 15 is an exhaust stack. Since the pressure in the combustion chamber 8 escapes to the exhaust stack 15 via the heat exchange chamber 14, there is a sudden increase in ignition. It tends to cause pressure increase.

[Explanation of action]

Combustion in the pressure spray burner with the above configuration is the same as in conventional products; during ignition operation, the blower 13 is first rotated to create an air flow from the combustion chamber 8 to the exhaust stack 15, and then,
The fuel pressurizing pump 1 is activated, and a spark from the ignition electrode 9 installed in front of the spray nozzle 2 ignites the sprayed fuel to start combustion, and the extinguishing operation is performed by stopping the fuel pump 1. It can be done.

In this invention, when the fuel pressurizing pump 1 is activated, the fuel in the pipe 3 pushes open the check valve 4, pushes the damper piston 6 of the pressure damper 5, compresses the compression spring 6', and increases the volume of the pressure damper 5. increase,
The pressure slowly rises to the set pressure of the fuel pressurizing pump 1, and stable ignition can be expected.

At this time, when the volume of the pressure damper 5 is large, the volume of the cylinder 7 is reduced by the piston 10 driven by the damper piston 6, so when the fire extinguishing operation is performed and the fuel pressurizing pump 1 is stopped, the pressure damper 5 is The volume of the cylinder 7 is reduced by the force of the compression spring 6', and the volume of the cylinder 7 is increased. Since a check valve 4 is attached to the connecting pipe 5', the fuel contained in the pressure damper 5 does not flow into the pipe line 3 but flows out through the orifice 11 into the outflow pipe line 12.
On the other hand, when the damper piston 6 of the pressure damper moves, the interlocking piston 10 expands the volume of the cylinder 7 that opens into the pipe line 3, so the pressure in the pipe line 3 is immediately reduced in the cylinder 7 after the fuel pressure pump 1 stops. At the same time, the fuel in the spray nozzle 2 and the pipe line 3 is also accommodated in the cylinder 7, and air is sucked in from the spray nozzle 2 instead.

In the embodiment, the damper piston 6 and the piston 10 are directly connected, and in this case, the pressure damper 5
If the cylinder 7 volume is made smaller than the cylinder 7 volume, the moving distance will be the same, so the pressure receiving area of the damper piston 6 will be larger than the pressure receiving area of the piston 10 of the cylinder 7, and the damper piston 6 will be larger than the pressure receiving area of the piston 10 of the cylinder 7.
This makes it possible to easily realize a structure in which the volume of the cylinder 7 is reduced when the volume of the pressure damper 5 is increased.

Furthermore, as a result of combining the check valve 4 and the orifice 11 without using an expensive electromagnetic on-off valve, after the damper piston 6 moves, the check valve 4 is pushed open and the pressure applied to the damper 5 is released through the orifice 11. However, the fuel pressurizing pump 1 used in the pressure spray burner has sufficient capacity, and even if the pressure drops a little, it will maintain the set pressure of 7 kg/cm ² and will not adversely affect the combustion performance of the burner.

[Explanation of effects]

As described above, in this invention, after the fuel pressure pump 1 is stopped, when the cylinder 7 volume increases, there is no fuel near the spray nozzle 2, so no fuel flows out from the spray nozzle 2, and the combustion chamber 8
The sore throat caused by the heat could be completely prevented. Further, since fuel does not accumulate in the combustion chamber 1, the shape of the combustion chamber 1 can be designed to improve combustion efficiency, and the degree of freedom in mounting the spray nozzle 2 is increased.

On the other hand, when the fuel pressure pump 1 operates during ignition operation, the fuel in the pipe 3 rises to the set pressure of the fuel pressure pump 1, but this rising speed is slowed down by the damper 5, so a heat exchanger 14 is installed. When used in the combustion chamber 8 where combustion pressure is difficult to escape, it also has the effect of reducing ignition noise.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a water heater equipped with this invention. FIG. 2 is a sectional view of this invention. 1...Fuel pressure pump, 2...Spray nozzle, 3
... Pipe line, 4 ... Check valve, 5 ... Pressure damper,
5'... Connection pipe, 6... Damper piston, 6'...
... Compression spring, 7 ... Cylinder, 10 ... Cylinder piston, 11 ... Orifice, 12 ... Outflow channel.

Claims (1)

[Claims] 1. A pressure damper 5 having a damper piston 6 and a compression spring 6' is attached to the pipe line 3 between the fuel pressurizing pump 1 and the spray nozzle 2, and when the fuel pressurizing pump 1 is started, the pipe line 3 In a pressure spray burner for controlling the pressure of A check valve 4 that allows inflow from the pipe line 3 to the pressure damper 5 is attached to the connecting pipe 5' to the damper 5, an outflow line 12 is attached to the pressure damper 5, and an orifice 11 is provided in the outflow line 12. A pressure spray burner characterized by: 2. The pressure spray burner according to claim 1, wherein the damper piston 6 and the piston 10 are connected, and the volume of the pressure damper 5 is larger than the volume of the cylinder 7. 3. The pressure spray burner according to claim 1, wherein the outflow pipe 12 attached to the damper 5 is connected to the suction side of the fuel pressurizing pump 1.