JPH03282118A - Trial operation control method for combustion amount varying device - Google Patents

Abstract

PURPOSE:To rapidly evacuate a flow passage by a method wherein, during trial operation of a device which pressurizes and feeds fuel oil to a return type pressure spray nozzle with the aid of a pump and regulates an oil amount of a part thereof by means of a flow rate regulating valve to return the oil amount, the oil fed through the flow rate regulating valve alternately and repeatedly with high and low flow rate. CONSTITUTION:Kerosene flows in an outbound oil pipe from an oil storage tank and is pressurized and fed to a return type pressure spray nozzle with the aid of a pump. A part thereof is atomized, the rest enters a return oil pipe, and a return oil amount is regulated by a flow rate regulating valve to return the rest to the upper stream side of the pump. During trial operation, an operation switch is turned ON, and a faucet is opened after a lapse of a specified time t1 to effect slow ignition of a burner. A kerosene feed amount is maximized after a lapse of a specified time t2, and thereafter, it is minimized within a specified time t3, and it is maximized within a specified time t4. Drive of the flow rate regulating valve is controlled so that repetition of above operation is effected a few times. When an oil amount is a maximum, air flowing to the return oil pipe side is caused to flow to the outbound oil pipe side, and when a return oil amount is a minimum, a spray amount is maximized. Air on the outbound oil pipe side is bled through a nozzle, and accurate regulation of flow amount can be carried out through following continuous operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a test run control method for a variable combustion amount device used in a domestic oil water heater or the like.

(b) Prior Art Conventionally, as one form of this type of oil combustion equipment, as shown in FIG.
A pump with a built-in shutoff valve (172)
The kerosene is pressurized by the kerosene, supplied to the return type pressure spray nozzle (173), and sprayed from the tip of the nozzle (173). A portion of the kerosene passes through the return oil pipe (174) and is then supplied to the solenoid valve (17B).
, strainer (177), and flow rate adjustment valve (17
5), the outgoing oil pipe (171) is returned to the upstream side of the pump (172).

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.

As shown in FIG. 13, trial run control of such an oil combustion device is performed by inserting a plug into an outlet, turning on the operation switch, and opening the faucet after a certain period of time to slowly ignite the burner. Afterwards, the forward oil flow rate is maximized and the same state is maintained.

(c) Problems to be Solved by the Invention However, when the kerosene tank (170) is empty, air is sucked into the outgoing oil pipe (171), and the air is sucked into the return oil pipe (174) side, that is, when the kerosene tank (170) is empty, Return oil pipe (174)
It flows into the solenoid valve (17B), the strainer (177), and the flow rate adjustment valve (175), but the return oil pipe (
Because the amount of return oil flowing through the side (174) is small, the air cannot be removed quickly, especially when the flow rate adjustment valve (174)
75) If air enters the combustion chamber, the flow rate adjustment valve (175) will not be able to accurately adjust the flow rate, and the amount of spray from the return force spray nozzle will also become inaccurate, making it impossible to ensure stable combustion. There was a problem.

(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 test run control method includes, during the test run, controlling the drive of a flow rate regulating valve to repeatedly change the amount of return oil flowing through the flow rate regulating valve between a large flow rate and a small flow rate. It is an object of the present invention to provide a trial run control method for a quantity variable device.

Another feature is that the amount of return oil flowing through the flow rate regulating valve is alternately and repeatedly changed between a maximum flow rate and a minimum flow rate.

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

That is, in the present invention, during a test run, the return oil is controlled to control the drive of the flow rate adjustment valve to repeatedly change the amount of return oil flowing through the flow rate adjustment valve between a large flow rate and a small flow rate. When the amount of oil is set to a large flow rate, the air flowing into the return oil pipe side can quickly flow into the oil pipe side, and when the amount of return oil is set to a small flow rate, the air flowing into the return oil pipe side can be quickly flowed into the oil pipe side. The amount of spray becomes large, the air on the outgoing oil pipe side is expelled from the return type pressure spray nozzle, and the air on the outgoing oil pipe side and the return oil pipe side can be quickly extracted.

At this time, the outgoing oil pipe and the return oil pipe form a circulation flow path, and when the return oil amount is large, the amount of spray from the return type pressure spray nozzle is small, and vice versa. When the flow rate is small, the amount of spray from the same spray nozzle becomes a large flow, and the amount of either the return oil or the amount of spray from the spray nozzle is changed so that it becomes larger alternately. There is.

In particular, by repeatedly changing the return oil amount between the maximum flow rate and the minimum flow rate, the air from the outgoing oil pipe side and the return oil pipe side can be removed more quickly.

Therefore, during subsequent continuous operation, since no air will flow into the flow rate adjustment valve, the flow rate can be adjusted accurately using the flow rate adjustment valve, and the amount of spray from the return force spray nozzle can also be adjusted accurately. This makes it possible to ensure a stable combustion amount.

(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 (2), and the remainder of the kerosene is returned to the return oil pipe (R), which will be described later, through the return channel (1).

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).
and a solenoid valve (■).

Then, by controlling the drive of the flow rate adjustment valve (FC) by the control unit (M), the amount of return oil is adjusted, and the amount of spray from the return pressure spray nozzle (N) is increased or decreased to increase or decrease the amount of combustion. I'm trying to make changes possible.

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 type pressure spray nozzle (N), and (Qr) is the amount of return oil passing through the return oil pipe (R).

Further, in the present invention, during a trial run, the drive of the flow rate regulating valve (FC) is controlled by the control unit (M).
C) The amount of return oil flowing therethrough is alternately and repeatedly changed between a large flow rate and a small flow rate.

That is, as shown in FIG. 3A, such test run control involves inserting the plug of the variable combustion device (A) into an outlet (not shown), turning on the operation switch (35), and turning on the faucet after a certain period of time (tl) has elapsed. When is opened, the gun type burner (20) can be ignited slowly, and after a certain period of time (t2) has passed, the kerosene supply amount (Qt), which is the outgoing oil flow rate, is set to the maximum flow rate (MAX), and then, after a certain period of time (t3) ), the kerosene supply amount (Qt) is set to the minimum flow rate (old N), and the kerosene supply amount (Qt) is set to the maximum flow rate (MAX) within a certain period of time (t4).
) several times (for example, 5
times).

Here, the above-mentioned fixed time can be, for example, (tl) 5 seconds, (t2) 2 seconds, (t3) 5 seconds, and (t4) 5 seconds.

Moreover, the above-mentioned trial run control is performed each time the plaque is inserted into the outlet (each time it is reset).

In this way, in the present invention, the flow rate adjustment valve (F
Control the drive of C) to adjust the amount of return oil flowing through the flow rate regulating valve (FC) between the maximum flow rate (MAX) and the minimum flow rate (formerly N).
When the return oil amount is set to the maximum flow rate (MAX) in order to repeatedly change the return oil amount to Also, when the return oil amount (R) is set to the minimum flow rate (old N), the spray amount from the return type pressure spray nozzle (N) becomes the maximum flow rate (MAX), and the same goes to the outgoing oil pipe (S) side. The air from the return pressure spray nozzle (N) can be expelled, and the air from the outgoing oil pipe (S) side and the return oil pipe (R) side can be quickly extracted.

Therefore, in the subsequent continuous operation, the flow rate adjustment valve (
In order to prevent air from flowing into the FC), the same flow rate adjustment valve (
FC), the amount of spray from the return type pressure spray nozzle (N) can also be adjusted accurately, and a stable combustion amount can be ensured.

Also, during the trial run, the maximum and minimum kerosene supply amount (Qt) is repeatedly changed and controlled in a short period of time to expel air, so that abnormal combustion does not occur in the gun type burner (20).

Also, if the oil storage tank (T) is empty, the outgoing oil pipe (S)
If air gets inside, the plug can be pulled out from the outlet and re-inserted to perform trial run control and expel the air as described above easily.

In addition, in this embodiment, the return oil amount is alternately and repeatedly changed between the maximum flow rate side ^X) and the minimum flow rate (old N), but the return oil amount is at least equal to N
) and the same nozzle (N).
It is also possible to repeatedly change between a small flow rate that is smaller than the amount of spray from the source.

At this time, since the outgoing oil pipe (S) and the return oil pipe (R) form a circulation flow path (C), if the return oil amount is set to a large flow rate, the return type pressure spray nozzle (N) will The amount of spray becomes a small flow rate.

In addition, the pattern of repeatedly changing the return oil amount is 3A.
The pattern is not limited to a sawtooth pattern as shown in the figure, but may also be a substantially rectangular wave pattern as shown in FIG. 3B.

Here, the above-mentioned fixed time, for example, (tl) is 5 seconds,
(t2) for 2 seconds, (t3) for 3 seconds, (t4) for 2 seconds, (
It is also possible to set t5) to 3 seconds and (t6) to 2 seconds.

In the case of such a substantially rectangular wave pattern, the maximum flow rate (M
AX) and the minimum flow rate (old N) for a certain period of time (t3) (t5
) to ensure that air is removed within the same time period.

In addition, a solenoid valve (V), 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 force spray nozzle (N) is arranged; 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 (26) 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).
It is installed.

In addition, a bath pipe (31) can be branched from the hot water supply pipe (28), and in this case, a 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 (m) consisting of ROM and RAM
and a timer (1).

The input interface (a) includes an operation switch (35), a temperature setting switch (36), and a water flow sensor (
26), a water temperature sensor (27), a hot water temperature sensor (30), and a bath water amount sensor (32).

In addition, the output interface (b) 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).

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 urges the valve body (74) to be pressed against the valve seat (72), (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,
The drive unit (81) is provided on the pump body (80).

As shown in FIGS. 7 and 8, 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 vibe, 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 (91) so as to be vertically slidable.
3) By applying a current to the piston rod (
Connect the lower end of the pump body 94) to the first communication passage (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) (9B) are upper and lower springs, (97)
is a magnetic ring.

At this time, when the piston rod (94) retreats upward,
The left side valve (85a) of the valve mechanism (85) opens, and the right side 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, so that kerosene is forced into the accumulator tank 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 (100), a cylindrical electromagnetic movable piece (104) that supports the valve body (102) via a support piece (103), ) 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 (1
0.1), kerosene does not flow to the return type pressure spray nozzle (N).

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

Further, the flow rate control valve (FC) 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 divided body (40a). ing.

And the - side port (43b) of this communication flow path (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, a nipple (43d) is attached to the upper surface of the valve casing (40), as shown in FIG. 9, 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 inlet port (4) of the flow rate adjustment flow path (43) is
2) is connected to the upstream side of the return oil pipe (R), that is, to the return 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 solenoid (51) 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 the sleeve (46) so as to be able to move forward and backward.

Then, by applying a current to the solenoid (5I), 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).
) is provided on the rear end surface of the cylindrical nut (61), and a screw punch (62) is screwed into the nut (61).
Insert the tip into the cylindrical sleeve (46) so that it can move forward and backward,
Moreover, inside the cylindrical nut (61), a screw punch (62
The spring receiver formed at the upper end of the plate (63) and the spring receiver formed at the lower end of the valve body advancing/retracting rod (47) are the plug (
A spring (65) is interposed between the valve casing (4) and the rear end (61a) of the cylindrical nut (6I).
0) 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 ( 44> can be adjusted to separate the spherical valve body (45) from the spherical valve body (45).

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 (Qr) 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) - return oil amount (Qr)) is the 11th
There is a linear correlation shown in the figure.

Therefore, in this embodiment, by finely adjusting the applied current (1), 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 the drawing]

Fig. 1 is a conceptual configuration explanatory diagram of an oil-powered water heater equipped with a combustion rate variable device that performs a test run using the control method according to the present invention, Fig. 2 is a cross-sectional side view of a return force spray nozzle, and Fig. 3
Fig. A is a timing chart of test run control, Fig. 3B is a timing chart of test run control as another embodiment, Fig. 4 is a control block diagram, Fig. 5 is a sectional view of a solenoid valve, and Fig. 6 is a timing chart of test run control.
The figure is a side view of the pump, FIG. 7 is a sectional view taken along the IT line in FIG. 6, FIG. 8 is a sectional view taken along the Fig. 10 is a graph showing the correlation between the applied current and the pressure on the secondary side of the flow rate regulating valve, Fig. 11 is a graph showing the correlation between the secondary side pressure of the flow rate regulating valve and the amount of return oil and the amount of spray, and Fig. 12 The figure is a conceptual configuration explanatory diagram of a conventional combustion amount variable device, and FIG. 13 is a timing chart of conventional trial run control. In the figure: (^) (B) (C) (FC) (G) (N) (S) (P) (R) (T) (40) (41) Variable combustion amount device Petroleum water heater circulation flow path Flow rate adjustment valve Check valve Return type pressure spray nozzle Forward oil pipe Pump return oil pipe Oil storage tank valve Casing One side opening (42): Other side opening (43): Flow rate adjustment flow path (43a): Communication flow path (44): Valve Seat (45): Spherical valve body (47): Valve body advancement/retraction rod (51,): Solenoid (69): Air outflow vertical groove

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 trial run control method for a variable combustion rate device that can change the combustion rate by increasing or decreasing the amount of spray, the control method controls the drive of a flow rate regulating valve (FC) during the trial run to A test run control method for a variable combustion amount device, characterized by repeatedly changing the amount of returning oil flowing between a large flow rate and a small flow rate.