JPH03282117A - Method for controlling combustion amount varying device - Google Patents

Abstract

PURPOSE:To adjust a spray amount through a nozzle to a proper value by a method wherein, when fuel oil is pressurized and fed to a return type pressure spray nozzle with the aid of a pump and a flow rate of a part thereof is controlled by a flow rate regulating valve to return the fuel oil, through detection of the temper ature of fuel in an outbound oil pipe, a current value to the flow rate regulating valve is controlled. CONSTITUTION:Kerosene is pressurized and fed from an oil storage tank to a return type pressure spray nozzle with the aid of a pump, a part thereof is atomized, the rest passes through a return oil pipe, a return oil amount is regulated by a flow rate regulating valve, and returned to the upper stream side of the pump. A temperature sensor is located in the portion, on the downstream side of the pump, of an outbound oil pipe to detect a kerosene temperature Tx. A spray amount - kerosene temperature characteristic curve U changed according to a current value Ix to the flow rate regulating valve is predetermined, and from the kerosene temperature Tx and a spray amount Qn based on a demand load, the current value Ix to the flow rate regulating valve is calculated, and control is made such that an actual current value Ir is caused to coincide with the current value Ix. A spray amount Qn based on a demand heat load can be set from a preset reference temperature Tb and the current value Ir to the flow rate regulating valve based on a demand heat load at the temperature Tb.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method of controlling a variable combustion amount device used in a domestic oil water heater.

(B) Conventional Technology Conventionally, as one form of this type of oil combustion device, as shown in FIG.
Pressurize the kerosene guided by the pump (172),
The kerosene is supplied to a return type pressure spray nozzle (173) and sprayed from the tip of the nozzle (173), and a part of the kerosene passes through a return oil pipe (174), passes through a flow rate adjustment valve (175), and is sent to an outgoing oil pipe ( There is a configuration in which the pump (171) is returned to the upstream side of the pump (172).

In addition, in Fig. 13, (176) is the return oil pipe (17
4) This is a check valve installed halfway.

With this configuration, this oil combustion device has a return oil pipe (
By changing the valve opening degree of the flow rate regulating valve (175) provided at 174) and adjusting the amount of return oil, the amount of spray can be controlled over a wide range and the amount of combustion can be changed.

That is, the amount of kerosene supplied (Qt) from the pump (172) to the return type pressure spray nozzle (173) is determined by the amount of spray (Qn) from the return type pressure spray nozzle (173) and the return oil pipe (174). Since the flow is divided into the return oil amount (Q') which returns to the upstream side of the outgoing oil pipe (171), the spray amount (Q
n) is the amount obtained by subtracting the return oil amount (Qr) from the kerosene supply amount (Qt), and by changing the return oil amount (Qr), the spray amount (Qn) can be adjusted.

Furthermore, conventionally, the above-described flow rate regulating valve (175)
The valve casing (1,80
), a flow rate adjustment channel (181) is formed in which the - side opening is connected to the upstream side of the return oil pipe (174) and the other side opening is connected to the downstream side of the return oil pipe (174). A valve seat (182) is provided in the middle of the flow rate adjustment flow path (181), and a needle-shaped valve body (183) is brought into contact with the valve seat (182) so as to be able to freely approach and separate, thereby freely opening and closing the flow rate adjustment flow path (181). By disposing a valve body advancing/retracting rod (185) driven by a solenoid (1g4) behind the needle-shaped valve body (183) and making the applied current to the solenoid (184) variable. , is characterized in that the amount of movement of the valve body movement rod (185) can be finely adjusted.

Then, by changing the applied current to the solenoid (1g4), the valve body advancing/retracting rod (185) and the needle-like valve body (1, 83) attached to the tip thereof are moved forward and backward toward the valve seat (182), and the valve body is moved back and forth toward the valve seat (182). Adjust the opening of the valve seat (182) and open the valve seat (182).
) by changing the pressure (P2) on the inflow side of
The spray amount (Qn) can be adjusted by changing the

(c) Problem to be solved by the invention However, when the temperature of kerosene is high, the viscosity decreases, but when the temperature is low, the viscosity increases, and when the viscosity is high, the spray from the return type pressure spray nozzle (73) Because of the large amount of hot water, there was a problem in that it was not possible to obtain an appropriate amount of combustion, and it was not possible to ensure good hot water output performance of home oil water heaters and the like.

(d) Means for Solving the Problems Therefore, in the present invention, an oil storage tank and a return type pressure spray nozzle are connected to each other by an outgoing oil pipe provided with a pump midway, and the nozzle and the outgoing oil pipe are connected upstream of the pump. The combustion amount variable device is capable of changing the combustion amount by increasing or decreasing the amount of spray from the nozzle by controlling the flow rate adjustment valve by connecting the side with the oil return pipe having a flow rate adjustment valve in the middle. The control method is characterized in that a temperature sensor is provided in the outgoing oil pipe, the temperature sensor detects the fuel temperature in the outgoing oil pipe, and the control unit controls the current value to the flow rate regulating valve based on the detected fuel temperature. The present invention aims to provide a control method for a variable combustion amount device.

(e) Action/effect According to the present invention, the following effects are produced.

That is, in the present invention, the controller calculates an appropriate current value for the flow rate adjustment valve based on the fuel temperature in the outgoing oil pipe detected by the temperature sensor, and controls the control unit to apply the calculated current value to the flow rate adjustment valve. In order to do this, the amount of spray from the return type pressure spray nozzle can be adjusted appropriately to obtain an appropriate amount of combustion, and it is possible to ensure good hot water dispensing performance of domestic oil water heaters and the like.

(f) Examples The present invention will be explained in detail below based on examples shown in the accompanying drawings.

FIG. 1 conceptually shows the overall configuration of an oil-powered water heater (B) incorporating a variable combustion amount device (A) according to the present invention.

First, to explain the configuration of the variable combustion amount device (A), in FIG. The kerosene that has flowed into and fallen into (S) is pressurized by an electromagnetic pump (P), and the return type pressure spray nozzle (N
).

As shown in Figure 2, the return type pressure spray nozzle (N) is
A jet flow path (10) and a return flow path (11) are formed inside the kerosene, and a part of the kerosene supplied to the return type pressure spray nozzle (N) through the outgoing oil pipe (S) is atomized. The remaining kerosene is ejected from the tip nozzle opening (12), and the remainder of the kerosene is returned to the return oil pipe (R), which will be described later, through the return flow path (11).

That is, in FIG. 1, the return oil pipe (R) is connected to the outgoing oil pipe (S).
) are installed in parallel.

The return oil pipe (R) has one end connected to the return passage (11) of the return type pressure spray nozzle (N), and the other end connected upstream of the pump (P) of the outgoing oil pipe (S). The circulation channel (C
) is formed.

In addition, a flow rate adjustment valve (FC) is installed at the end of the return oil pipe (R).
is installed.

Then, by controlling the flow rate adjustment valve (PC) by the control unit (M), the return oil amount is adjusted, and the amount of spray from the return type pressure spray nozzle (N) is increased or decreased, thereby changing the combustion amount. I'm trying to do that.

In addition, in this embodiment, a shutoff valve (101) is provided in the pump (P).
In addition to the built-in solenoid valve (
■) is installed, and the opening and closing operation of the solenoid valve (■) is controlled by a pump (P
) is linked to the drive/stop operation of the

Then, the solenoid valve (■) that closes in conjunction with the stop operation of the pump (P) prevents kerosene from flowing back through the return oil pipe (R) to the pressure spray nostle (N). It is possible to reliably prevent kerosene from leaking from the burner (N), and to prevent the generation of soot and sound when extinguishing a gun type burner (20) to be described later.

In addition, in Fig. 1, (Qt) is the amount of kerosene supplied from the pump (P) to the return type pressure spray nozzle (N), (
Qn) is the amount of spray from the return pressure spray nostle (N), and (Qr) is the amount of return oil passing through the return oil pipe (R).

In addition, in the present invention, as shown in FIG.
) A temperature sensor (1) is provided downstream of the pump (P),
The temperature sensor (1) detects the kerosene temperature (Tx) in the outgoing oil pipe (S), and based on the detected kerosene temperature (Tx), the control unit ( M
) can be controlled.

That is, as shown in Fig. 3, the spray amount-kerosene temperature characteristic curve (
U), and based on the same characteristic curve (U), calculate the kerosene temperature (Tx) in the outgoing oil pipe (S) detected by the temperature sensor (1) and the spray amount (Qn) based on the required load. ), calculate the appropriate current value (Ix) to the flow rate adjustment valve (FC), and match the calculated current value (Ix) with the actual current value (l'') to the flow rate adjustment valve (FC). The control unit (M
).

FIG. 3 shows the above-mentioned spray amount-kerosene temperature characteristic curve (U
) is an explanatory diagram of the spray amount-kerosene temperature characteristic curve (Ul).
~ (U5), the vertical axis shows the spray amount (Qn) from the return type pressure spray nozzle (N), and the horizontal axis shows the kerosene temperature (Ta) when the circulation flow path (C) is a closed circuit. , flow rate adjustment valve (
The change curve of the amount of spray and the temperature of kerosene that changes according to the current value (+1) to (+5) applied to pc) is obtained empirically.

In addition, the spray amount (Qn) based on the required heat load is determined based on the spray amount-kerosene temperature characteristic curve (U) and the reference kerosene temperature (Tb) set in advance.
) can be set from the current value (I'') to the flow rate regulating valve (pc) based on the required heat load.

For example, assuming that the standard kerosene temperature (Tb) is 10°C, the current value (1'') to the flow rate regulating valve (FC) based on the required heat load at the same standard kerosene temperature (Tb) is (13 ), the spray amount (Qn) based on the required heat load is 3.Oi)/h from the spray amount-kerosene temperature characteristic curve (U3).

In addition, the kerosene temperature (T
x) is 30℃, the spray amount based on the required heat load (
Qn) or 3.01)/h, it can be seen from the spray amount-kerosene temperature characteristic curve (Ul) that the appropriate current value (lx) is (I2).

Therefore, the control unit (M) controls the current value (+3) actually applied to the flow rate regulating valve (pc) to match the calculated current value (I2).

In this way, the amount of spray (Qn) from the return type pressure spray nozzle (N) can be made appropriate, and an appropriate amount of combustion can be obtained, ensuring good hot water output performance of the petroleum water heater (B). be able to.

Moreover, a thermistor can also be used as the temperature sensor (1).

In addition, a solenoid valve (■), a pump (P), and a flow rate adjustment valve (
The structure and operation of FC) will be explained in detail later.

Next, the configuration of the petroleum water heater (B) will be explained with reference to FIG. 1. (20) is a gun type burner in which the above-mentioned return type pressure spray nozzle (N) is disposed inside; The burner (20) has its rear connected to a fan (22) via a duct (21).

Furthermore, a damper (23) is provided within the duct (21) to adjust the amount of combustion air supplied.

(34) is an igniter.

A heat exchanger (24) is located below the gun type burner (20).
) is installed, and the water supply piping (
25), and the same water supply pipe (25) is connected to the water supply pipe (25).
A water amount sensor (2B) and a water temperature sensor (27) are attached.

On the other hand, the hot water supply pipe (
28) includes a flow rate adjustment valve (29) and a hot water temperature sensor (30).
is installed.

It is also possible to branch a bath pipe (31) from the hot water supply pipe (28), and in this case, the bath water flow sensor (3
2) and a shutoff valve (33) will be installed.

The control unit (M) also includes a microprocessor (MPU) and an input/output interface (a), as shown in FIG.
)(b) and memory (n+) consisting of ROM and RAM
and a timer (1).

The input interface (a) includes an operation switch (35), a temperature setting switch (3B), and a water flow sensor (
26), a water temperature sensor (27), a hot water temperature sensor (30), and a bath water amount sensor (32).

The output interface (b) also includes a pump (P).
, a solenoid valve (■), a flow control valve (FC) (29), a shutoff valve (33), a fan (22), a damper (23), and an igniter (34) are connected.

In addition, as shown in Fig. 5, the solenoid valve (■) has a communication flow path (71) provided in the cylindrical valve casing (70), and a valve seat (71) is provided on the downstream side of the communication flow path (71). 72) is provided, and a cylindrical valve body advancing/retracting rod (73) is provided in the communication flow path (71) so as to be able to slide forward and backward, and the valve body advancing/retracting rod (73) is connected to a valve body driving mechanism (75). The valve body is moved forward and backward by the movement lever (73).
) is integrally molded at the tip of the valve body (74), which can be detached from the valve seat (72).

Further, (76) is a flow path provided in the valve body advancing/retracting rod (73), (77) is a valve spring that biases the valve body (74) toward the valve seat (72) in a suppressed state, (70a) (70b) is an upstream connecting portion that connects to the upstream side of the outgoing oil pipe (S), and (70b) represents a downstream connecting portion that connects to the downstream side of the outgoing oil pipe (S).

Further, the valve body drive mechanism (75) is connected to the valve casing (70).
A solenoid (78) is provided on the outer peripheral surface of the solenoid (78).
By applying a current to the valve body advancing/retracting rod (78)
3) can move forward and backward along the axis, and the valve body movement rod (73
) moves the valve body (74) at the tip to the valve seat (7).
2), so that the communication channel (71) can be opened and closed.

In addition, (78a) is a cylindrical bobbin, (78b) is a coil,
(78c) is a cap, and (78d) is a cord.

In addition, the pump (P), as shown in FIGS. 6 to 8,
A drive section (81) is provided on a pump body (80).

As shown in FIGS. 7 and 9, the pump body (80) is connected to the upstream side of the outgoing oil pipe (S) and the nipple (82).
The suction port (83) connected via the same suction port (83)
communicates with the valve mechanism (84) via the first communication path (84).
5) and a valve chamber (86) containing the same valve chamber (86).
) and an accumulator (88) that communicates with each other via a second communication path (87).

Further, the drive unit (81) includes a hollow magnetic rod (91) provided in a cylindrical bobbin (90) that also serves as a guide pipe, and a coil (92) provided on the outer periphery of the bobbin (90). It constitutes a solenoid (93).

A piston rod (94) is disposed directly below the magnetic rod (9I) so as to be vertically slidable.
3) By applying a current to the piston rod (
94) of the pump body (80).
84) Slide the inside forward and backward to pump kerosene into the pump body (80)
In addition, it can be inhaled into a communication channel (99) which will be described later. (95) (98) are upper and lower springs, (97)
is a magnetic ring.

At this time, when the piston rod (94) retreats upward,
The left valve (85a) of the valve mechanism (85) opens, and the right valve (85b) closes to draw kerosene into the valve chamber (86), and the piston rod (94)
When the fuel oil advances downward, the left valve (85a) closes, and the right valve (85b) opens, forcing kerosene into the accumulator (88).

In addition, a cylindrical discharge joint (98) connected to the downstream side of the outgoing oil pipe (S) is connected to the upper part of the bobbin (90), and a communication flow path (99) is provided within the discharge joint (98). A valve seat (100) is provided in the middle of the communication flow path (99), and a shutoff valve (101) is provided within the communication flow path (99).

The shutoff valve (101) has the valve seat (100);
A valve body (102) that is separated from the valve seat (101), a cylindrical electromagnetic movable piece (104) that supports the valve body (102) via a support piece (103), 102) and a valve spring (105) interposed between the magnetic rod (91) and the magnetic rod (91).

In such a shutoff valve (101), when a current is applied to the solenoid (93), the electromagnetic movable piece (104) moves against the valve spring (105).
), the valve body (102) is separated from the valve seat (100), the communication flow path (99) is brought into communication, and the current is applied to the solenoid (93). When released, the pressing force of the valve spring (105) causes the valve body (1
02) contacts the valve seat (100) in a pressed state and closes the communication flow path (99).

Therefore, when the drive of the pump (P) is stopped, the shutoff valve (l
O1,) prevents kerosene from flowing to the return pressure spray nostle (N).

Also, in Figure 7, (10B) is the upper plate, (107) is the lower plate, (108) is the cap, (109) and (110) are 0.
It's a ring.

Further, the flow rate regulating valve (pc) is configured as follows.

That is, in FIG. 9, the two-part body (40a) (40
The valve casing (40), which is composed of (b) and forms a long cylindrical body, is provided with a communication flow path (43a) horizontally penetrating the upper part of the negative side divided body (40a). ing.

And the - side opening (43b) of this communication channel (43a)
As shown in Fig. 1, is connected to the upstream side of the outgoing oil pipe (S), and the other side opening (43c) is connected to the outgoing oil pipe (S).
It is connected to the downstream side.

On the other hand, as shown in FIG. 9, a nipple (43d) is attached to the upper surface of the valve casing (40), and a return oil flow path (43e) provided in the nipple (43d) is
A flow rate adjustment flow path (43) formed of an L-shaped bent flow path is formed in the middle of the communication flow path (43a) through a valve seat (44), which will be described later.

The inflow side opening (4) of the flow rate adjustment channel (43) is
2) is connected to the upstream side of the return oil pipe (R), that is, to the return type pressure spray nozzle (N) side.

In addition, a valve seat (44) is located midway through the flow rate adjustment channel (43).
), and a spherical valve body (45) is provided on the negative side of the valve seat (44) so as to be separable from the valve seat (44).

In this way, as described above with reference to FIGS. 1 and 9, in this embodiment, a flow rate control valve is installed at a point where the end of the return oil pipe (R) is connected to the upstream side of the outgoing oil pipe (S). (FC) and inside the flow rate adjustment valve (FC).
), and a flow rate adjustment channel (43) that connects the end of the return oil pipe (R) to the middle of the communication channel (43a) is provided. There is.

It goes without saying that the mounting position and shape of the flow rate control valve (FC) are not limited to the above, and may be any position as long as it is in the return flow path.

In addition, in this embodiment, the valve seat (44) of the spherical valve body (45)
A valve body drive mechanism (K) is provided on the side facing the valve casing (40), that is, at the bottom of the valve casing (40), and the valve body drive mechanism (K) has the following configuration.

The spherical valve body (45) is fitted into a circular groove (48) provided at the tip of a valve body movement rod (47) that moves back and forth on the axis of the valve casing (40).

On the other hand, the base end of the valve body advancing/retracting rod (47) is attached to the valve casing (
40) A cylindrical sleeve (40) provided in the center of the solenoid (51) disposed within the other side divided body (40b) and configured by winding a coil (50) around a cylindrical bobbin (49). It is disposed in a long hole (52) formed in 46) so as to be movable forward and backward.

Then, by applying a current to the solenoid (51), the valve body advancing/retracting rod (47) is moved back and forth along the axis,
A spherical valve body (45) fitted into the tip of the valve body advancing/retracting rod (47)
can be separated toward the valve seat (44), and the amount of return oil flowing through the return oil pipe (R) can be adjusted.

Further, as shown in FIG. 9, the flow rate regulating valve (FC) is equipped with an advancing/retracting force adjustment mechanism (60) for adjusting the advancing/retracting force of the valve body advancing/retracting rod (47).

The advancing/retracting force adjustment mechanism (60) includes a valve casing (40).
) A cylindrical nut (61) is provided on the rear end face of the screwdriver (61), and a screwdriver (62) is screwed into the nut
) is inserted into the cylindrical sleeve (46) so that it can move forward and backward, and inside the cylindrical nut (61), the screw punch (6
2) The spring holder formed at the upper end of the plate (63) and the spring holder formed at the lower end of the valve body advancing/retracting rod (47) have a spring (65) interposed between them and the plug (64), and a cylindrical shape. Connect the rear end (61a) of the nut (61) to the valve casing (
40) It is fixedly connected to the bottom plate of the other side divided body (40b) by caulking.

With this configuration, by rotating the screw punch (62) by a desired means, it moves forward and backward in the axial direction of the valve casing (40), and by moving forward and backward, the forward and backward force of the valve body movement rod (47), that is, the valve seat ( The force separating the spherical valve body (45) from the valve body (44) can be adjusted.

In addition, in this embodiment, since a spherical valve body (45) is used as the valve body, as shown in FIG. 10, the applied current (1)
The correlation between this and the secondary pressure (P2) generated at the inflow side opening (42>) of the flow rate adjustment channel (43) can be changed approximately linearly.

On the other hand, through the secondary pressure (P2) and the return oil pipe (R),
Between the return oil amount (Q'') on the upstream side of the outgoing oil pipe (S) and the spray amount (Qn) from the return type pressure spray nozzle (N) (kerosene supply amount (Qt) - oil amount (Qr)) There is a linear correlation shown in FIG.

Therefore, in this embodiment, by finely adjusting the applied current (+), the return oil amount (Qr), that is, the spray amount (Qn)
can be changed linearly and accurately, allowing accurate combustion control.

In addition, as described above, in this embodiment, the valve body advancement/retraction rod (4
7) has an automatic adjustment core function, so the distance between the valve seat (44) and the spherical valve element (45), that is, the valve opening degree, can be accurately controlled. In conjunction with this effect, more accurate combustion control can be achieved.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram illustrating the configuration of an oil water heater equipped with a variable combustion amount device controlled by the control method according to the present invention, Fig. 2 is a cross-sectional side view of a return type pressure spray nozzle, and Fig. 3 is a spray An explanatory diagram of the quantity-kerosene temperature characteristic curve, Fig. 4 is a control block diagram, Fig. 5 is a sectional view of the solenoid valve, Fig. 6 is a side view of the pump, and Fig. 7 is a cross section taken along the I-1 line in Fig. 6. Figure 8 is a sectional view taken along the line ■■ in Figure 6, Figure 9 is a cross-sectional front view of the flow rate adjustment valve, Figure 10 is a graph showing the correlation between the applied current and the secondary pressure of the flow rate adjustment valve. Fig. 11 is a graph showing the correlation between the secondary side pressure of the flow rate regulating valve, the amount of return oil, and the amount of spray, Fig. 12 is a conceptual configuration diagram of a conventional flow rate regulating valve, and Fig. 13 is a graph of the conventional combustion It is a conceptual structure explanatory diagram of a quantity variable device. In the figure, (^) (B) (C) (FC) (G) (N) (S) (P) (R) (T) (40) (41) (42) (43) (43a) Amount of combustion Variable device Petroleum water heater Circulation flow path Flow rate adjustment valve Check valve Return pressure Spray nosle Outgoing oil pipe Pump Return oil pipe Oil storage tank Valve Casing One side open Other side flow rate adjustment flow path Two communication flow paths (44): (45) : (47): (51): (f19): Valve seat spherical valve body Valve body advancing/retracting rod 2-noid vertical groove for air outflow

Claims (1)

[Scope of Claims] 1) The oil storage tank (T) and the return type pressure spray nozzle (N) are connected to each other through an outgoing oil pipe (S) with a pump (P) installed midway, and the nozzle (N) and outward oil pipe (S
) and the upstream side of the pump (P), and a flow rate adjustment valve (F
The nozzle (N) is connected by a return oil pipe (R) provided with C) and controlled by a flow rate adjustment valve (FC).
In a control method for a combustion amount variable device that can change the combustion amount by increasing or decreasing the amount of spray of The combustion amount is characterized by detecting the fuel temperature (Tx) inside the engine and controlling the current value (Ix) to the flow rate regulating valve (FC) by the control unit (M) based on the detected fuel temperature (Tx). Control method for variable devices.