JPH0722246U - Combustion amount control device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to widen the adjustable range of the combustion amount in a combustion amount adjusting device such as a water heater. A combustion amount adjusting device in which fuel oil is supplied to a spray nozzle 10 by a delivery pump, excess fuel oil is returned by a return pipe 14, and the amount of return is controlled by a flow rate adjusting valve 20. In the above, a pressure variable pump 18 that can change the discharge pressure is used as the delivery pump.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a combustion amount adjusting device used in a combustion device such as a home water heater.

[0002]

[Prior art]

 A combustion amount adjusting device for adjusting the amount of combustion is installed in the combustion device of a petroleum water heater at home. FIG. 5 systematically shows a conventional example of the combustion amount adjusting device. In the figure, 100 is a spray nozzle, and 102 and 104 are a supply pipe and a return pipe connected to this spray nozzle 100, and a delivery pump 106, a check valve 108 and a flow rate control valve 110 are provided in each.

In this combustion amount adjusting device, the fuel oil 114 in the tank 112 is pressure-fed to the spray nozzle 100 by the delivery pump 106 via the strainer 116, and the surplus fuel oil 114 is returned through the return pipe 104. Then, the return amount of the fuel oil 114 through the return pipe 104 is controlled by the flow rate control valve 110.

In the case of this combustion amount adjusting device, the difference between the amount of fuel oil 114 supplied to the spray nozzle 100 and the amount of fuel oil 114 returned through the return pipe 104 is the amount of atomization from the spray nozzle 100.

[0005]

[Problems to be solved by the device]

 By the way, in this combustion amount adjusting device, the range in which the combustion amount can be adjusted based on the flow rate control of the flow rate adjusting valve 110 is limited to a relatively narrow range, and it is difficult to set the combustion amount to a certain level or lower. There was a problem.

Therefore, when it is desired to perform combustion in a range lower than the control range of the combustion amount by the operation of the flow rate control valve 110, that is, when the generated heat amount is to be lowered, the switch is repeatedly turned on and off to generate or extinguish a flame. However, this causes problems such as clicking noise and odor.

In this case, it is possible to deal with this by using a small size nozzle as the spray nozzle 100, but as described above, the control range of the combustion amount by the flow rate control valve 110 is limited to a certain value. Therefore, if the lower limit of the combustion amount adjusting range is lowered by such means, it becomes impossible to increase the combustion amount, that is, the heat generation amount.

[0008]

[Means for Solving the Problems]

 The present invention has been made to solve such a problem, and its gist is to connect a fuel oil supply pipe and a return pipe to a spray nozzle for spraying fuel oil, and to deliver the fuel oil onto the supply pipe. A pump is provided with a flow rate control valve on the return pipe, and the delivery pump pumps the fuel oil to the spray nozzle and the flow rate control valve regulates the flow rate of the fuel oil in the return pipe. In the combustion amount adjusting device according to the second aspect, a pressure variable pump capable of changing the discharge pressure is used as the delivery pump.

[0009]

[Action and effect of the device]

 As described above, the present invention uses a pump whose discharge pressure is variable as the delivery pump. According to the present invention, the flow rate of the fuel oil in the return pipe is adjusted by the flow control valve and the delivery pressure of the fuel oil by the delivery pump is adjusted. The combustion amount can be adjusted by both the adjustment and the combustion amount can be adjusted over a wider range than before. This makes it possible to deal with the case where the amount of heat generated is to be lowered and vice versa.

[0010]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes a spray nozzle, to which a fuel oil (kerosene) supply pipe 12 and a return pipe 14 are connected. A strainer 16 and a pressure variable pump 18 having a variable discharge pressure are provided on the supply pipe 12, and a flow control valve 20 and a check valve 22 are provided on the return pipe 14.

The other end of the return pipe 14 is connected to the upstream side of the pressure variable pump 18 in the supply pipe 12. Reference numeral 24 is a tank for containing fuel oil.

In the apparatus of this example, the fuel oil in the tank 24 is pressure-fed to the spray nozzle 10 by the pressure variable pump 18, and the surplus fuel oil is returned through the return pipe 14 and supplied from the supply pipe 12. The difference between the amount and the amount returned through the return pipe 14 is sprayed from the spray nozzle 10.

In this example, the combustion amount can be controlled by both the flow rate adjustment by the flow rate control valve 20 and the change in the discharge pressure by the pressure variable pump 18. Specifically, for example, in the low combustion region, the discharge pressure of the pressure variable pump 18 is kept constant, and the combustion amount can be changed by controlling the opening of the flow rate control valve 20, and in the high combustion region, the flow rate can be changed. The amount of combustion can be changed by fully closing the control valve 20 and changing the discharge pressure of the variable pressure pump 18.

As a result, as shown in FIG. 2, the adjustable range of the combustion amount is the adjustable range (A) by the flow rate control valve 20 (0.9 l / hour to 2.9 l / in this example). Time) and the control range (B) (2.9 l / hour to 5.0 l / hour) of the pressure variable pump 18 are added to the range (A + B), and the combustion amount can be adjusted over a wide range. Become. However, the numerical values in the table are merely examples.

FIG. 3 shows an example of the flow rate control valve 20. In the figure, 26 is a stator coil, 28 is a rotor, 30 is a screw shaft that rotates integrally with the rotor 28, and 32 is a female screw member. A ball 34 is held at the lower end of the screw shaft 30 in the figure, and the ball 34 is in contact with the needle 36.

The needle 36 controls the opening of the valve portion, and is biased upward by the spring 38, that is, in the direction of closing the valve portion. The lower end of the spring 38 is in contact with the spring receiver 40.

In the case of this flow rate control valve, the screw shaft 30 is rotated by rotating the rotor 28 by exciting the stator coil 26 by energizing the stator coil 26, thereby moving the position of the ball 34 up and down, and moving the needle 36 up and down. Move the position. As a result, the opening degree of the valve portion is changed, and the flow rate of the fuel oil flowing through the pipe line 42 is adjusted.

FIG. 4 shows an example of the pressure variable pump 18. In the figure, 44 is a coil, 46 is a fixed rod for fixing the position made of a magnetic material, 48 is a movable rod also made of a magnetic material, and these are elastically bulged in the opposite directions by a spring 50. A pressure plunger 52 is fixed to the movable rod 48 in a state of integrally moving.

The pressurizing plunger 52 has a function of directly delivering the fuel oil by the vertical movement in the figure. Specifically, a negative pressure is generated in the pressurizing chamber 54 due to the upward movement of the pressurizing plunger 52, and the fuel oil from the inflow port 56 pushes open the suction side check valve body 58 based on this negative pressure. It is sucked into the pressurizing chamber 54.

Further, due to the downward movement of the pressurizing plunger 52, the fuel oil in the pressurizing chamber 54 pushes open the discharge side check valve body 60 and flows out, and is further discharged from the discharge port 62.

In this pressure variable pump, when the coil 44 is energized, a magnetic circuit passing through the coil 44, the fixed rod 46, and the movable rod 48 is formed, and the movable rod 48 is sucked upward in the drawing, thereby pressurizing. The plunger 52 is lifted up. When the power supply is stopped, the movable rod 48 and the pressure plunger 52 are pushed downward by the elastic force of the spring 50.

The lower end of the fixed rod 46 is a tapered portion 64 that can be expanded and reduced in diameter. The lower end of the screw shaft 66 screwed into the fixed rod 46 with respect to the tapered surface of the tapered portion 64. Are brought into contact with each other via balls 68.

Therefore, in this pressure variable pump, when the downward screwing amount of the screw shaft 66 is increased, the tapered portion 64 is expanded outward in the radial direction and the outer peripheral surface thereof and the upper end of the movable rod 48 are expanded. The gap with the peripheral surface is narrowed, and the suction force of the movable rod 48 when the coil 44 is energized is increased.

As a result, the lifting stroke of the pressure plunger 52 is increased, and the discharge pressure for the fuel oil is increased. On the other hand, when the screwing amount of the screw shaft 66 is reduced, the stroke of the pressure plunger 52 is reduced and the discharge pressure is reduced. Therefore, the discharge pressure can be freely changed by changing the screwing amount of the screw shaft 66. The rotation operation of the screw shaft 66 may be performed manually, or may be driven by the motor 74 based on the meshing of the gears 70 and 72.

The embodiment of the present invention has been described in detail above, but this is merely an example. For example, the flow rate control valve and the pressure variable pump in the above example are merely examples of the present invention, and the flow rate control valve and the pressure variable pump of various other structures and configurations can be used in the present invention. Others The present invention can be configured in a form in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram systematically showing a combustion amount adjusting device according to an embodiment of the present invention.

2 is an illustration of the advantages of FIG. 1. FIG.

FIG. 3 is a diagram showing an example of a flow rate control valve in FIG.

4 is a diagram showing an example of a pressure variable pump in FIG.

FIG. 5 is a diagram systematically showing an example of a conventional combustion amount adjusting device.

[Explanation of symbols]

 10 Spray Nozzle 12 Supply Pipe 14 Return Pipe 18 Delivery Pump 20 Flow Control Valve

Claims (1)

[Scope of utility model registration request] 1. A spray nozzle for spraying fuel oil is connected to a fuel oil supply pipe and a return pipe, a delivery pump is provided on the supply pipe, and a flow rate control valve is provided on the return pipe.
In the combustion amount adjusting device configured to pressure-feed the fuel oil to the spray nozzle by the delivery pump and adjust the flow rate of the fuel oil in the return pipe by the flow rate control valve, the discharge pressure is changed as the delivery pump. A combustion amount adjusting device characterized by using a variable pressure pump.