JP3022333B2 - Manufacturing method of fuel supply electromagnetic pump for oil combustor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump which is used for supplying a predetermined amount of liquid fuel such as white kerosene to a small-sized petroleum combustor for consumer use such as a heater. Particularly, the present invention relates to a manufacturing method including a step of adjusting a discharge flow rate during mass production to a predetermined value.

[0002]

2. Description of the Related Art Electromagnetic pumps have been used for a long time as oil feed pumps for supplying a fixed amount of liquid fuel to mainly small oil combustors for combustion. Rather, the development of electromagnetic pumps has exploded the market for heaters, boilers or driers equipped with these small commercial oil fired appliances.

That is, in the 1960s, the discharge pressure and flow rate were relatively large as electromagnetic pumps for gun type oil burners.
An electromagnetic pump having a complicated configuration including a pressure adjusting mechanism and the like was first introduced to the market by the present applicant. Then rice,
Electromagnetic pumps equipped with a moisture content control circuit for drying cereals such as wheat, tobacco, foods, etc., and in the early 1970's, forced supply / exhaust heaters, and combustion of oil stoves (so-called oil fan heaters) For the first time as a fuel pump to a vessel.

[0004] The fan heater has been greatly welcomed in the market because of its low price, and the demand has increased greatly up to now. However, due to the current economic situation, there is intense competition in sales prices, and sales prices are decreasing. On the other hand, there is a tendency that the price of electromagnetic pumps incorporated therein is also drastically reduced. In addition, the requirements for the discharge flow rate characteristics are extremely strict as described later, and there are also severe demands for guarantees for its durability and reliability.

[0005] Accordingly, the present invention aims at assembling the electromagnetic pump and its combustor, streamlining an adjustment process for maintaining the discharge flow rate of fuel oil within a predetermined value range, reducing production costs by saving labor, and Its quality assurance. Therefore, first, the small-sized combustor, that is, a rotary, in which fuel oil is atomized, heated and vaporized and burned, or a combustor such as an air-jet system or a Bunsen system in which fuel oil is heated by a heater and vaporized and ignited and burned, is used. The most compact electromagnetic pump for supplying fuel has been known in the art.

Although the structure is not particularly explained, as an example of the electromagnetic pump used in the present invention, it will be briefly described with reference to FIG. In FIG. 2, a return spring 23 is provided between the inside of a tube cylinder 21 inserted in the axial through hole of the electromagnetic coil 20 of the electromagnetic pump 1 and a return spring seat 34 provided on the discharge joint 40 side.
And an auxiliary spring 24 between the other end and the suction joint 37 side. The auxiliary spring 24 is supported by the two springs and has a valve spring 25, a suction valve 26, and a suction valve seat 27. A free-piston electromagnetic plunger 22 having a built-in valve mechanism is provided with a magnetic attraction force generated by the application of a pulsed intermittent current to the electromagnetic coil 20 surrounding the tube cylinder 21 and the like, and a repulsion of the return spring 23. A valve spring 28 and a discharge valve are provided in a discharge joint 40 provided with a discharge orifice 41 for slidingly reciprocating in the tube cylinder 21 by using force alternately and connecting the suction valve mechanism and a tube cylinder end portion. Body 2
9 and a discharge valve mechanism constituted by a discharge valve seat 30 to perform a pumping operation in combination with an opening / closing operation, and a filter 39 covering a suction port 38 of a suction joint 37 in FIG.
The filtered fuel oil passes through the suction port 38 and the inside of the tube cylinder 21, is discharged from the discharge orifice 41 of the discharge joint 40, and is vaporized by the combustor facing the connection pipe via a connection pipe to a combustor (not shown). It is discharged to the vaporization chamber of the vessel or the furnace, and is configured to vaporize and burn.

In general, in the case of a fuel oil supply electromagnetic pump for a small-sized commercial petroleum combustor, the pulsed intermittent current to the electromagnetic coil 20 rectifies a commercial AC power supply and includes a voltage stabilizing circuit including a zener diode. Through a pulse oscillation cycle and a circuit for adjusting the conduction period during the cycle, that is, the duty ratio, and a drive circuit of the electromagnetic pump for adjusting the current peak value by interposing a resistor in the circuit to adjust the discharge flow rate to a predetermined value. It is controlled to maintain.

The pulse-shaped intermittent current applied to the electromagnetic coil 20 has a frequency substantially in proportion to the frequency and the duty ratio within a certain range of the frequency, and varies per unit time of the electromagnetic pump according to the peak value of the current. Increasing the discharge flow rate is already disclosed and well known in prior art documents. That is, in the old days, Japanese Patent Publication No. 41-17264,
JP-B-41-18883, JP-B-56-387
No. 96, Japanese Patent Publication No. 57-12865, Japanese Utility Model Publication No. 59-41377, Japanese Utility Model Publication No. 63-39
No. 430 discloses a discharge flow control circuit for an electromagnetic pump that has no spare time.

However, these discharge flow control circuits are individually assembled to the electromagnetic pump until at least 10 years ago, adjusted to the required discharge flow, and further assembled into an oil combustor, and then further burned. It was common to re-adjust according to. Immediately thereafter, work to reduce the production cost and space of the oil combustor including the electromagnetic pump and to save space, and to adjust the discharge flow rate of the pump in the maintenance service for troubles and failures after selling the combustor to the user according to the combustor. In order to achieve compatibility and economics that minimize component replacement and minimize the need for parts replacement, a system in which the discharge flow rate control circuit is integrated with the control circuit of the combustor as a whole has been adopted, and this has become the mainstream. became. This type of circuit is hereinafter simply referred to as a combustion control circuit.

By the way, the producer of the combustion control circuit, the combustor and the electromagnetic pump are often different from each other. Therefore, as will be described in detail later, the voltage, cycle, duty ratio, and the like of the pulse current for controlling the discharge flow rate in this combustion control circuit can be regulated most strictly, but there is still a certain range of tolerance, and the electromagnetic pump is The magnetic force is affected by the change in magnetizing force and magnetic flux density depending on the wire diameter of the so-called enameled copper wire of the electromagnetic coil, the thickness of the insulating coating, the specific resistance, the number of turns, and the magnetic permeability of the magnetic circuit of the electromagnetic pump. Dimensional accuracy, surface roughness of finished surface, roundness, frictional resistance during electromagnetic plunger operation due to straightness, fluctuation of Reynolds number related to fuel oil viscosity with temperature change added to it, and spring constant Even if there is a slight difference within the allowable range, the collection of these variations will significantly affect the discharge performance of the pump, and furthermore, the inner diameter of the pipes and nozzles connected to the combustor, the roughness of the inner surface, The differential refinement and conditions of pressure changes air flow in the furnace of the combustor itself in length tolerance Les, the discharge flow rate control of the electromagnetic pump, i.e. a combustor of the combustion amount of settings are those different slightly.

[0011] Consumer petroleum combustors, for example, forced-ventilated open petroleum stoves specified in Japanese Industrial Standards, that is, petroleum fan heaters, maintain the room temperature at a desired temperature in response to an increase or decrease in outside air temperature. The discharge of fuel oil to be burned is controlled so that it can be burned proportionally in a stepless or several steps in a range of about 1 to 10 milliliters per minute, and the tolerance of the predetermined combustion amount is specified within ± 10%. ing.

However, the range of the natural maximum flow rate of the individual pumps before adjustment by the discharge flow rate control circuit in the electromagnetic pump itself varies up and down by about 20 to 30%. When the discharge flow rate is adjusted by the control circuit, the pump itself is much more severely regulated to achieve a predetermined (reference) combustion amount ± 10%. For example, the combustor producer requires the discharge flow rate at the time of receiving the electromagnetic pump to be ± 6 to 7% of a predetermined combustion quantity, and the electromagnetic pump producer requires that the discharge flow rate adjustment in the manufacturing process be ± 2 of the predetermined discharge flow rate. At present, inspections at the time of shipment often require regulations of ± 4 to 5%.

The finished dimensions of the electromagnetic coil and the components of the electromagnetic pump are controlled and produced with considerably tight tolerances. For example, even if a single electromagnetic plunger is used, its outside diameter is several microns after machining and coating with an anti-friction agent, and the same applies to the roundness and straightness. If the outer diameter and the like are restricted to a micron or less, the production cost of this electromagnetic plunger alone will probably be about 10 times the price of one electromagnetic pump. Therefore, to regulate the above-mentioned tolerance of each component constituting the electromagnetic pump more severely than at present,
This is contrary to the required cost reduction and cannot be implemented at present.

An electromagnetic pump and a combustor incorporating the same are mass-produced in respective predetermined models, and any combination thereof is within the allowable range of the predetermined combustion amount.
The efficiency of adjustment work to regulate the variation of the discharge flow rate of the electromagnetic pump in advance is improved to improve production efficiency and reduce costs. In order to avoid accidents with problems, it has become common to not install a discharge flow rate adjusting mechanism such as a variable resistor outside the electromagnetic pump.

For example, Japanese Patent Publication No.
The one disclosed in the publication of No. 1001033 is known. This prior art, as described in the claims, discloses an electromagnetic coil provided on the outer periphery of a cylinder containing a free-piston plunger and a second coil terminal fixed from the electromagnetic coil. A third terminal in which a fixed resistor is connected between the first terminal, the second terminal, and the first terminal;
And a drive pulse supplied from a drive circuit in the oil combustor in a state of being incorporated in the oil combustor, is supplied between the second and third terminals to discharge fuel at a predetermined discharge rate. In the fuel supply electromagnetic pump of a petroleum fuel device that discharges, in a state where the fixed resistor is not provided, the drive pulse supplied from the drive circuit of the petroleum combustor has a predetermined discharge amount or more. An electromagnetic pump is manufactured in advance, and a drive pulse from a drive circuit for discharge amount inspection is supplied to the first and second terminals to measure a discharge amount of the electromagnetic pump. According to the deviation, a fixed resistance value having a resistance value falling within an allowable range for the predetermined discharge amount in a state of being incorporated in the oil combustor with respect to the discharge amount of the electromagnetic pump is selected, and the selected fixed resistor is selected. Between the first and third terminals. Petroleum combustor fuel supplying solenoid pumps ", characterized in that to connect.

[0016]

Problems to be Solved by the Invention
In the prior art disclosed in Japanese Patent Publication No. 033, a predetermined intermittent pulse current having a duty ratio during an oscillating cycle is applied to an electromagnetic coil provided on the outer periphery of a cylinder containing a free-piston plunger to perform a pump action. Conventionally, a method of obtaining a predetermined discharge amount by adding a series resistor to the pulse current to reduce the current value and adjust the discharge amount of the pump in a decreasing direction is known.

That is, a current value is reduced by applying a series resistance to the current energized to the electromagnetic coil as described above, or a relief valve, a pressure reducing valve, etc. are provided in the pump to reduce the discharge pressure and flow rate thereof. It is well known and practiced to manufacture an electromagnetic pump in advance so that the discharge capacity of the pump is equal to or higher than a predetermined discharge force in order to enable the above.

In this regard, it is natural that all devices are used with an output adjusted to a predetermined value below its maximum output. Next, in this conventional example, in the column of the claims, "a drive pulse is supplied from the discharge amount inspection drive circuit to the first and second terminals to measure the discharge amount of the electromagnetic pump, However, even if there is a third terminal to which a fixed resistor is connected between the first terminal and the third terminal, regardless of the presence or absence of “without the fixed resistor”, the first terminal When the current flows between the second terminals, the fixed resistor is short-circuited and useless.

On the other hand, in the publication of the prior art, column 7, lines 32 to 35, "Or, the discharge rate of the pump is measured with a resistor having a specific resistance value interposed, and the measured flow rate is measured. From above, a predetermined fixed resistor is selected as described above. " In this description, it is unknown because there is no description of where a resistor having a predetermined resistance value is interposed.

Further, the description in the claims of this conventional example states that "the discharge amount of the electromagnetic pump is measured, and the discharge amount at this time, the reference flow rate, and the deviation thereof". No explanation is given for deviations, and their definitions are not clear. Then, "a fixed resistance value having a resistance value falling within an allowable range for the predetermined discharge amount in a state of being incorporated in the petroleum combustor for the discharge amount of the electromagnetic pump is selected." The method may be based on the method of selecting a predetermined fixed resistor described in column 6 lines 4 to 7 and column 7 lines 24 to 35 of the specification of the Japanese Patent Publication, however, the pump discharge in the above state It is only necessary to measure the amount and to select a fixed resistor determined from the relationship between the flow rate and the resistance value obtained in advance from experimental data according to the deviation of the measured flow rate from the reference flow rate. Since there is no description about the means, it lacks specificity.

Further, Japanese Utility Model Application Laid-Open No. 53-31, which is described in the specification of the above-mentioned prior art patent publication as a prior art.
No. 303, a variable resistor is connected in series to the coil, and the flow rate of the electromagnetic pump is adjusted to a predetermined flow rate by adjusting the resistance value of the variable resistor. The so-called cut-and-try method for selecting a fixed resistor will not be adopted because it is denied in the specification of the patent publication of the prior art at column 7, lines 36 to 39.

It is also possible to connect the fixed resistors having different resistance values to the terminals of the respective contacts and switch them to the respective electromagnetic coils by turning a rotary switch to select the discharge flow rate of the pump. This method is also excluded from the prior art range of the conventional example (see Japanese Patent Publication No. 7-66294). Further, when the discharge amount is expected to be approximately determined by the resistance value added in series to the electromagnetic coil in advance in the same production lot, the selection of the fixed resistor is often performed in order to adjust the discharge flow rate to a predetermined value. A small degree of skill is required, and it is possible by the so-called intuition of the discharge flow rate adjuster. However, this is not limited to the technical range of the conventional example as well as manual selection of the resistor for each pump and Adjustment increases costs.

As described above, in the conventional example described in Japanese Patent Publication No. Hei 7-110103, the means for selecting a fixed resistor having a resistance value falling within an allowable range with respect to the predetermined discharge amount is not clear. There is no. It is considered impossible. However, the technique of the conventional example is described in the specification of the patent publication at column 6, lines 40-42, and at column 7, lines 36-3.
In line 9 and in column 9 lines 9 to 10 of the same statement, "selection of a fixed resistor and connection and fixing of the fixed resistor are performed by one discharge amount measurement for each electromagnetic pump." There is a description.

This is because, when the same type of electromagnetic pump takes the relationship between the additional resistance value and the discharge flow rate which are interposed in series in the electromagnetic coil, and the horizontal axis represents the additional resistance value and the vertical axis represents the discharge flow rate, the relationship is obtained. The diagram is assumed to be premised on the assumption that the diagram is substantially linear and the inclination with respect to the horizontal axis is also substantially constant. When shown in figure 6, is a straight line which has a slope of Q ₀ and the street abscissa theta. In the figure, the additional resistance value RΩ is plotted on the horizontal X axis, and the discharge flow rate value milliliters per minute is plotted on the vertical Y axis. The X axis R ₀ is the fixed resistance value of the electromagnetic coil, the point o is the actual flow rate measurement value when the additional resistance value to the electromagnetic coil is increased, and Q ₀ is the flow rate value when there is no additional resistance to the electromagnetic coil. R-Q regression by the method of least squares the sum of the squares of the Y-axis direction distance is determined as a minimum by regression analysis from the average value of n straight line at an angle of the Q ₀ street X-axis and θ
It is a straight line.

The selected additional resistance value corresponding to the predetermined flow rate Q _X is R ′ _X , which is the value to be obtained. Now, assuming that the additional resistance values R _{1 to} R _N ; explanatory variables x, and the corresponding flow rate values Q _{1 to} Q _N ;

[0026]

[Outside 1]

From the above equations, y, a, and b are respectively obtained. However, due to various factors that cause a change in magnetic force and dimensional accuracy of the tolerance range of the components of the electromagnetic pump, surface roughness, frictional resistance, changes in the Reynolds number, changes in the spring constant, etc. The accumulation of the variation strengthens or weakens each other and affects the discharge amount of the pump, and the so-called one-point measurement value Q ₀ ′ or Q ₀ ″ by “one measurement” of the RQ straight line fluctuates, In addition, the straight lines passing through these Q ₀ ′ and Q ₀ ″ and connected to obtain the additional resistance value corresponding to the predetermined flow rate Q _{X also} have the inclination angles θ ′ and θ ″ with respect to the X axis as shown by the dashed line and the dotted line. Each one is different,
It is not necessarily parallel to the regression line.

This means that the values of a, b, and y in the above three equations of the regression analysis are different from each other, and that a single flow rate measurement has a resistance value within a permissible range for a predetermined discharge amount. It is not possible to "select a fixed resistor" and the probability is low. Therefore, first, when considering the magnetic force that affects the discharge performance of the electromagnetic pump, the magnetizing force is based on the product of the number of turns of the electromagnetic coil and the current value flowing therethrough, that is, based on the ampere turn, the magnetic flux density generated by this ampere turn is calculated. The quotient divided by the magnetizing force is the magnetic permeability. Therefore, the strength of the magnetic force is set by these factors, and the dimensional accuracy of the components of the pump, the coefficient of friction, the fluctuation of the Reynolds number of the fluid, and other factors are taken into consideration, and variations in the discharge performance are generated for each pump. .

Now, assuming that the specific resistance value of the electromagnetic coil is R ₀ , the additional resistance values are R _{1 to} R _N , the applied voltage is E, the current value to be energized is A, and the number of turns of the coil is T, E = (R ₀ + R _{1 to} R _N ) A The magnetizing force F is

[0030]

[Outside 2]

## EQU1 ## Here, a diagram of a value obtained by using the example of the electromagnetic pump to which the present invention is applied to determine the value of the magnetizing force A × T when the additional resistance value is sequentially increased to the specific resistance value R ₀ of the electromagnetic coil. This will be described with reference to FIG. FIG.
Takes the additional resistance R ₁ to R _N in the horizontal axis, is obtained taking the magnetizing force ampere turns on the vertical axis. The voltage from the drive power supply to this electromagnetic coil is DC 23.5 volts ± 0.05
The bolt and coil wire diameter are 0.25 ± 0.005 mm, the number of turns is 1600 + 0% to −1%, and the specific resistance of the coil is 31 ohm ± 3% at 20 ° C. In the case of FIG. 4, the voltage, the resistance value, and the number of windings are calculated based on the reference value. As shown in the drawing, the relationship between the additional resistance value and the ampere turn is a curve.

The same type of electromagnetic pump should have such a diagram, but the production lot and the individual pumps therein do not always have a similar diagram. The reason is that the drive power supply voltage, cycle, and duty ratio also have extremely small tolerances, and the enamel-covered electric wire of the electromagnetic coil and the reduction in cross-sectional area due to the extension of the tension during winding, and the tolerance within the tolerance due to the thickness of the coating. Due to a change in the specific resistance of the coil due to a change in the total winding length due to an increase or decrease in the outer diameter, and a change in the temperature due to the ambient temperature or the radiant heat from the combustor, if the resistance increases from 20 ° C to 32 ° C, for example. In the case of this example, the resistance increases by about 5%. In this manner, the current value for energizing the coil fluctuates, and the number of turns thereof has a tolerance. Therefore, in the ampere turn, the inclination angle and the curve with respect to the X axis also change as compared with the case of FIG.

The magnetic material constituting the magnetic path such as the electromagnetic plunger described above can be cut even if it has been magnetically annealed in advance.
The structure may change due to plastic working such as grinding, polishing, or press fitting of the valve seat, and the magnetic permeability may decrease by several tens of percent as an example. There is a risk that it is impossible to maintain the straightness within the tolerance due to thermal deformation and the like, and this cannot be performed, and in addition to this, the dimensional accuracy of the parts constituting the pump described above The accumulation of the variation within the tolerance set with the economical efficiency, and more particularly, the overlap of the tolerance of the vertical dimension, is caused by the cylinder 2 shown in FIGS.
1 and the electromagnetic coil 20, each of which is fitted at both ends thereof, and which is externally fitted to the discharge joint 40.
An annular magnetic pole 32 sandwiched together with the electromagnetic coil 20 by screwing the outer frame yoke 31 and the mounting screw 42 through
And the annular magnetic path seat plate 33, the variation of the magnetic gap g between the lower end surface of the annular magnetic pole 32 and the upper end portion of the electromagnetic plunger 22 and the longitudinal direction of the electromagnetic coil 20. Variations occur in the distance f between the magnetic neutral point and the magnetic center point of the electromagnetic plunger 22, which greatly affects the discharge performance of the pump.

That is, the above-mentioned accumulation of the vertical dimension tolerances of the pump components and the respective free heights of the return spring 23 and the auxiliary spring 24 for supporting the electromagnetic plunger 22 and different values within the tolerances of the spring constants. The magnetic gap g and the distance f change. Since the magnetic attraction to the electromagnetic plunger 22 is inversely proportional to the square of the magnetic gap, it has a significant relationship with the output of the pump for this magnetic gap g.

The relationship between the magnetic gap g and the force of the two springs pressing the electromagnetic plunger is disclosed in detail in Japanese Patent Publication No. 57-12863 proposed by the present inventor. Description is omitted. As described above, since the components that make up the pump include many factors that affect the discharge performance of the individual pumps, the diagram shown in FIG. The consequences are never uniform.

Therefore, when one flow rate measurement, that is, the additional resistance value-flow rate measurement is to be adjusted and controlled by a so-called one-point measurement of the flow rate for one of the resistance values,
There is an inaccuracy, the probability of setting the flow rate within the allowable range of the predetermined flow rate is low, and the cost is low. As described in detail above, the present invention corrects the deficiencies of the prior art, and in a process of mass-producing an electromagnetic pump, in a method of manufacturing by adjusting the discharge flow rate to a measured value, the above-mentioned components of the pump are described above. Avoid strict tolerances such as dimensional accuracy, etc. as much as possible, without increasing the cost of pump production and maintenance, and further increase the number of methods of adjusting the discharge flow rate and increase the cost due to the increase The aim is to solve the above trade-off problem by saving labor, stabilize the discharge performance and other quality characteristics of the pump, improve the reliability and make quality assurance, and achieve the production cost reduction together. ,
That is the subject.

[0037]

According to the present invention, there is provided, in particular, a method for manufacturing a fuel supply electromagnetic pump for an oil combustor, wherein the method includes the steps of: And a terminal A for connecting and fixing both ends of the winding of the electromagnetic coil, respectively.
B, and a terminal C connected from the one terminal A via a fixed resistor, and a drive pulse-shaped current incorporated in the oil combustor and supplied from a drive circuit provided in the combustor. An electromagnetic pump that is connected and urged between the terminal C and the remaining terminal B that is not connected to the terminal C to maintain a predetermined fuel discharge amount, wherein the drive is performed between the terminals A and B without passing through the fixed resistor. At the time of energizing the pulse, in a fuel supply electromagnetic pump for an oil combustor designed and manufactured in advance to exceed the predetermined fuel discharge amount, adjustment is performed by measuring a correlation equivalent to or a correlation in advance with a drive circuit to be provided in the oil combustor. When supplying a drive pulse from the drive circuit for discharge flow rate inspection between the terminals A and B, it is necessary to add an additional fixed resistor to the terminal A in order to adjust the discharge flow rate of the pump. The resistance value of the fixed resistor group having a different resistance value is larger and smaller than the resistance value expected as the additional fixed resistor, that is, the two attached fixed resistors closer to the lower limit and the upper limit can be switched. Two measurement points of the discharge flow rate of the electromagnetic pump corresponding to each of the switched attached fixed resistors are measured by the interposed resistance circuit, and two measurement points are set on the additional resistance-flow rate diagram. The measurement points are connected by an arbitrary straight-line connecting line, and the additional resistance
A predetermined resistance value is obtained from an intersection of a line indicating a predetermined fuel discharge amount on the flow rate diagram and the connection line, and the fixed resistor group is selected from the fixed resistor group so as to fall within an allowable range of the predetermined fuel discharge amount. From the above, a resistor having a resistance value approximate to the predetermined resistance value is selected, the selected resistor is temporarily connected between the terminal A and the terminal C, and the discharge flow rate inspection drive circuit is switched from the resistance circuit, A drive pulse is supplied between the remaining terminals B and C, and the temporarily connected selected resistor is permanently connected as an additional fixed resistor only when it is confirmed that the predetermined fuel discharge amount falls within the allowable range. be able to.

[0038]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing an implementation system of the present invention, that is, one basic embodiment of a method of adjusting and setting a discharge flow rate to a predetermined value.
FIG. 1 is a vertical sectional view showing a partial cross section of an example of a fuel supply electromagnetic pump for petroleum combustors which is an object of the present invention, and a plan view showing a terminal portion thereof.

The structure and operation of the electromagnetic pump of FIG. 2 have already been described.
0 terminal B11 and terminal B11
2. The same terminal C13 is provided, one terminal 14 of the winding of the electromagnetic coil is connected and fixed to the terminal A11, and the other terminal 15 is connected and fixed to the terminal B12. A fixed resistor 16 is connected between the terminal A11 and the terminal C13. Can be connected.

FIG. 1 will be described. Input from a power supply circuit such as a commercial AC not shown in the figure,
A pulse current in which a predetermined voltage, a frequency, a conduction period during a cycle, that is, a duty ratio is set, is output from a drive circuit 2 for discharge amount inspection of an electromagnetic pump similar to that included in a combustion control circuit incorporated in an oil combustor. It is supposed to be.

The fuel oil discharged from the electromagnetic pump 1 is guided to a carburetor or a furnace of a combustor through a connection pipe nozzle (not shown). The length of the inner diameter of the pipe and the nozzle, the surface roughness of the inner diameter, and the fuel Changes in factors such as fluctuations in the Reynolds number due to the temperature between them, airflow in the furnace, and pressure fluctuations in the flame,
Since the discharge amount may fluctuate, the pulse may be readjusted and set every time even in the discharge flow rate inspection drive circuit 2 in which the correlation between these characteristics of the combustor is measured in advance and adjusted. There is. In other words, even with electromagnetic pumps of the same specification, the same model, and an oil combustor incorporating the same, there is a slight difference for each production lot, so that it is necessary to adjust the correlation each time.

As described above, this type of electromagnetic pump has a great number of factors affecting its discharge performance, is the least expensive, does not have a pressure and flow rate adjusting mechanism, is simple in structure, and is a small free piston pump. In addition, changes in the stroke length and hydraulic pressure of the electromagnetic plunger, which immediately change the discharge flow rate, due to ampere turns that generate a magnetomotive force, fluctuations in the Reynolds number of fuel oil, sliding resistance of the electromagnetic plunger, and flow loss when the valve is opened and closed. The transmission of the electromagnetic plunger and the driving force is not a rigid structure, but only the magnetic force and the repulsive force of the spring. The discharge amount is adjusted by adjusting the power of the electromagnetic pump designed and manufactured to a desired discharge flow rate or more. The method of reducing the current by adding a series resistance value to the voltage and decreasing the voltage to reduce the discharge flow rate to a predetermined value and hold the same is a method in front of the pump manufacturing parts. Is What the most inexpensive way configured to restrict the variations in the discharge flow rate caused by the accumulation of tolerances and the like.

However, on the other hand, it is necessary to simultaneously measure the above-mentioned additional resistance value selection and the work of confirming the predetermined flow rate of the pump in order to save labor and labor and to reduce the cost by improving the efficiency. Therefore, the description returns to FIG. One bus connecting the output terminal 6 of the ejection amount inspection drive circuit 2 to the terminal B12 for connecting and fixing the terminal 15 of the winding of the electromagnetic coil 20; One is terminal d and the other is terminal C
13 and a terminal c switched by the relay 4
The first fixed resistor R ₁ having a small resistance value near the lower limit and the second fixed resistor R ₂ having a large resistance value near the upper limit in a group of resistors described later are connected to terminals of the relay 3. There is a bus connected to a terminal A11 to which the other terminal 14 of the electromagnetic coil 20 is connected and fixed via a resistor circuit 7 in which a and b are switchably interposed. The terminal C13 and the terminal A1 are connected to each other.
1, an additional fixed resistor R16, which will also be described later, can be connected.

When a drive pulse is supplied from a drive circuit for discharge pressure inspection (hereinafter simply referred to as drive circuit) 2, first, terminal c of relay 4 is closed, and terminals a and b of relay 3 of resistance circuit 7 are switched. When the electromagnetic coil 20 is energized by alternately switching the first fixed resistor R ₁ and the second fixed resistor R ₂ , the first and second discharge flow rates Q ₁ , Q ₂ is measured, and the first and second discharge flow rates Q ₁ and Q ₂ and the resistance values of the first and second fixed resistors R ₁ and R ₂ are used as additional resistances shown in FIG. value - the diagram flow line, the secondary set the measurement points P _1, P _2, tie the bond line to be described later explained between the second measurement points P _1, P _2, this additional resistance - flow value line between the the resistance value R _X to be added by the intersection P _x of the a predetermined line indicating a discharge flow rate Q _X and the bond line in In order to keep the predetermined discharge flow rate within the allowable range of, for example, ± 2 to 2.5%, the resistance is selected from among the fixed resistor group mainly composed of those defined in Japanese Industrial Standards. A resistor having an approximate value of the value R _X is selected as one fixed resistor, and the selected fixed resistor R is connected to the terminals A11 and C13.
And the terminal c of the relay 4 is opened.
The terminal d is switched to be closed, and the selected resistor R is permanently connected as an additional fixed resistor only when the electromagnetic coil 20 satisfies a predetermined allowable range of the discharge flow rate.

FIG. 7 is a flowchart showing one embodiment of the method of adjusting the discharge flow rate and selecting the additional fixed resistor. When the discharge flow rate of the pump adjusted by the temporarily connected fixed resistor R is out of the predetermined allowable range of the fuel discharge amount, the additional resistance value of the pump is re-determined.
The discharge flow characteristics are reviewed, and processing is performed according to the procedure shown in the flowchart of FIG. Further, when the drive pulse is supplied from the drive circuit 2 for discharging flow rate inspection, the switching relay 4 and the resistor circuit 7 are omitted, and the terminals A, 11 and the terminals B, 12 are directly connected to one bus. wherein the different R ₁ or by interposed resistor to R ₂ resistance value, measured two measurement points of the discharge amount of the electromagnetic pump according to each of these two attached fixed resistor, the additional resistance - Two measurement points are set on the flow rate diagram, and an additional fixed resistor corresponding to a predetermined fuel discharge amount is selected by the same procedure as described above, and can be used as means for solving the above problem. FIG. 5 shows an additional resistance value ohm on the horizontal axis and a flow rate value milliliter / liter on the vertical axis in order to determine the additional resistance value of the electromagnetic coil 20 with respect to the predetermined fuel discharge amount.
This is an example of the connection lines obtained by taking a part, and these connection lines will be described later in detail when describing the attached Tables 1 to 12.

Therefore, a method for adjusting the flow rate to a predetermined value by adding an additional resistance value to the electromagnetic coil 20 by the electromagnetic pump 1 having the configuration shown in FIG. Comparative description will be made with reference to Tables 1 to 12. In this case, n20 units randomly selected from the population N assembled and selected as close as possible to dimensional accuracy of all parts including the electromagnetic coil 20 constituting the electromagnetic pump 1 and other specified reference values. The respective flow rates were adjusted by the electromagnetic pumps described above. This depends on the purpose of making the flow characteristics uniform. The reason why n20 is set is that the number of samples n in the quality control and the sampling inspection, regardless of the size, is 20, and the number of acceptance / rejection determinations C is a minimum constant value, for example, O, and the horizontal axis represents the lot number of the lot. The defect rate is taken, and the OC axis curve established on the vertical axis when this lot passes is almost similar. The larger the lot size N is, the smaller the relative sample n size is. The value of n is set to 20 with reference to the point of success.

The twenty electromagnetic pumps were used in all experiments of the flow rate adjusting method described below. However,
The discharge orifice 41 and the pipe are formed by extremely fine dust such as the electromagnetic pump passing through a fibrous or other filter 39 included in the fuel oil, or foreign matter such as metal chips or ultra-fine pieces such as plastic in the pump. In order to prevent the fuel oil from adhering to the inside of the nozzle and obstructing the flow of the fuel oil, adhering to the valve body and impairing its function, and obstructing the sliding reciprocating operation of the electromagnetic plunger 22 to prevent the flow from fluctuating. The experiment was conducted with careful attention to cleaning the inside of the pump.

In addition, the inside of the pump including the suction joint 37 is discharged due to discharge pulsation such as so-called initial suction which is empty when the pump is started and turbulence of the electromagnetic plunger 22 generated by separation of dissolved gas in fuel oil. In this experiment, the so-called running-in operation was performed in advance when the pump was operated, and experiments were performed on the flow rate measurement and the flow rate measurement at the time of adjusting the predetermined flow rate. (1) Then, with respect to the electromagnetic pumps of 20 samples n, the resistance values of the flow rate adjusting additional resistors are 0.0, 2.0, 4.3,
Additional resistance value when each flow rate at each measurement point is measured with 6.2, 8.0, 10.0 Ω as each measurement point-
Table 1 shows the discharge flow rates and their variations. O ohm is a case where only the specific resistance value of the electromagnetic coil 20 without an additional resistance value is given.

In the table, x _m is the average value, HENSA is the standard deviation, MAX is the maximum value, MIN is the minimum value, and R is Nehaba, which are common to the following tables. The regression coefficient is a value obtained by performing a regression analysis by the least square method described above, and a represents the additional resistance values R _{1 to} R _n on the horizontal axis, and the corresponding flow rates Q _{1 to} Q _{n on the} vertical axis. Where b is the slope of the added resistance value-discharge flow rate diagram, and b represents the intercept of the diagram, and the reason why a negative sign is attached to the numerical value is that the diagram is falling to the right. is there. γ is a correlation coefficient. That is, when R is represented by x and Q is represented by y,

[0050]

[Outside 3]

Is as follows. Table 2 shows the average value in the regression equation converted flow rate. In this way, as described above, even if the dimensional accuracy and other tolerances of the components of the electromagnetic pump are selected and incorporated as close as possible to their standard values, each pump has
There are variations of this delivery rate, 100 minutes rate of the 3 [sigma] (standard deviation) / x _m is about ± 12%.

Calculation of these numerical values will be described later. Table 3 shows the rate of change of the measured flow rate with respect to the converted flow rate by regression analysis, which corresponds to the added resistance value. (2) Next, the additional resistance value-discharge flow rate diagram (hereinafter simply referred to as a diagram) will be described with reference to FIG.

In FIG. 5, two measurement points, one larger than the expected value and the other smaller than the expected value, are selected as measurement points, and the first and second fixed resistors R at that time are selected.
_1, the discharge flow rate of the pump when adding R ₂ taken as Q ₁ and Q ₂ on Figure 5, R ₁ -Q _1, the point of attachment of R ₂ -Q ₂ P _1, P ₂ (measurement points P ₁ (2.0Ω), P
₂ (8.0Ω is selected), and these are taken as two measurement points. The conversion formula of a straight line passing through these measurement points P ₁ and P ₂ is The flow rate values Q ₁ and Q for the additional resistance values R ₁ and R _2
When the values of a and b are obtained from ₂ ,

[0054]

[Outside 4]

[0055]

[Outside 5]

The flow variables a and b obtained from these two equations
The values are substituted into the conversion equation to obtain the flow rate Q ₁ to Q _n for additional resistance R ₁ to R _N, to obtain a predetermined flow rate Q _x additional resistance R _x to obtain a by diagram depicting it can.

However, the application of these conversion equations is specific to two measurement points, and the same result cannot be obtained even if the measurement points are regarded as the same. That is, when two measurement points are obtained, the average regression line of n = 20 units cannot be used, and the two measurement points are individually connected by a connection line of an arbitrary straight line, and this connection line is connected to the additional resistance − There is no choice but to use a virtual line of the additional resistance-flow rate line on the flow rate diagram. The actual measurement values of n = 20 units in Table 4 were measured at two measurement points P ₁ (2.0Ω) and P ₂ (8.
0 Ω), each of the two measurement points is connected by a connection line formed by an arbitrary straight line, and the flow rate of each measurement point by the connection line is imagined in Table 5. Table 6 shows a comparison between the measured values in Table 4 and the virtual values in Table 5. In Table 6, since 2.0Ω and 8.0Ω among the measurement points in Table 4 are used as the measurement points in Table 5, the difference is shown as 0.00. In the electromagnetic pump, comprising a coupling line by any of a straight line connecting the two measurement points, and the resistance value corresponding to the intersection P _x and a predetermined flow rate Q _x to be obtained. Such a measurement method is
Since two measurement points are used, this method is called a so-called two-point measurement method and is effective when mass-producing an electromagnetic pump. (3) Next, Examples curve connecting line connecting the measuring points P ₁ and P _2, additional resistor approximates the further measured values - virtually the flow chart, the additional resistance is adjusted to a predetermined discharge flow rate - flow line A method of selecting an additional resistor for adjusting the discharge flow rate to a predetermined discharge flow rate will be described with reference to FIGS. 4 and 5 and Tables 7, 8, and 9 below.

Incidentally, the fixed resistance value R _O of the electromagnetic coil described in the description of FIG. 4 is not only a mere DC resistance value, but also becomes an impedance when an intermittent pulse current is energized. The value increases. This value is is c, the additional resistance value _{r 1 ~r n, R 1 ~R} n, the R _x such as X, multiplied by the electrical and efficiency of the mechanical pump as a motor in ampere-turns A × T described above When the calculated value is a and the correction coefficient is b, the flow rate Q with respect to the additional resistance value is obtained from the following conversion formula.

[0059]

[Outside 6]

On the contrary, the additional resistance value x for obtaining the predetermined flow rate can also be selected from this equation, and this is a conversion equation for calculating the converted flow rate in the two-point measurement method. From the diagram of the additional resistance value versus the actually measured value of the discharge flow rate shown in FIG.
a and b are also required. That is,

[0061]

[Outside 7]

Therefore, the respective coefficients are obtained from the following equations based on the data of the actually measured flow rates which are different from each other in the electromagnetic pump.

[0063]

[Outside 8]

[0064]

[Outside 9]

Next, the above equations (2) and (3)
By substituting the values of c, a, and b obtained in (4), the relationship between the discharge flow rate and the additional resistance value of each pump becomes the reduced flow rate.

Table 7 shows the measured and recorded variation of the discharge flow rate with respect to the additional resistance value for the sample n = 20 randomly extracted from the population N for each production rod of the electromagnetic pump. 2.0, 4.3, 6.
The measured values at 2, 8.0 and 10.0 Ω are the same as Tables 1 and 4. FIG. 5 shows a curve obtained by substituting the average value x of a, b, and c in Table 7 into the equation (1). The three measurement points p ₁ (0.0Ω), p ₂ (6.2Ω),
When p ₃ (10.0Ω) is selected, as shown in FIG. 5, the added resistance values r _1, r ₂ , and r ₃ are plotted on the horizontal axis, and the fixed resistance value R of the electromagnetic coil is plotted on the horizontal axis.
_o (average values q ₁ , q ₂ , q ₃ ) of the respective flow rates when added to (described above in the description of FIG. 6), the combined line of the lines passing through the points on both axes is the measurement value The point p ₁ ,
p ₂ and p ₃ . Of these three measurement points, the intersection of the perpendiculars rising from the respective midpoints of the sides connecting p ₁ and p ₂ and p ₂ and p ₃ respectively becomes the center of curvature, and this curvature center and the three measurement points When the connecting line has a radius of curvature ρ and the three measurement points are connected by an arc having the radius of curvature ρ, the connecting line approximates to a curve obtained by substituting the equation (1).

When supplying a drive pulse from the drive circuit (2) shown in FIG. 1 to each of the electromagnetic pumps of the production lot population N, the first and second fixed resistors R ₁ , R The discharge flow rate of the pump when ₂ is added is shown as Q ₁ and Q ₂ in FIG. 5, and R ₁ −Q ₁ , R ₂ −
The connection points P ₁ and P ₂ of Q ₂ are obtained. The connection points P ₁ and P ₂
Is selected from two measurement points, 2.0Ω and 8.0Ω,
These are the two measurement points. There are two ways to select the resistor, one that is larger than the expected resistance value of the additional resistor to be sought and one that is smaller. When these two measurement points P ₁ and P ₂ are connected by a connecting line of an arc having the radius of curvature ρ, this connecting line can be a virtual line of the additional resistance-flow rate line on the additional resistance-flow rate diagram. . Using this virtual line, the sample n = 20
Table 8 shows the flow rate of each of the measurement points applied to the measurement.
Table 9 shows a comparison between the measured values in Table 7 and the virtual values in Table 8. In Table 9, since 2.0Ω and 8.0Ω among the measurement points in Table 7 are used as the measurement points in Table 8,
The difference is shown as 0.00. The additional resistance to be added the theoretical resistance R _x may correspond to the intersection P _x and a predetermined flow rate Q _X of obtaining this coupling line is determined. Then, the (1) a table 7, b, the flow rate value Q of the curve obtained by substituting the average value of c is corresponding to the Q _X in formula, added to the resistance value x corresponds to the R _x It will be.

Then, as described above, from the fixed resistor group, a resistor having a resistance value approximate to the resistance value R _X is selected as one fixed resistor R to be added, and this is selected as FIG.
Is temporarily connected between terminals A11 and C13 shown in FIG.
13, a pulse current is energized from the drive circuit 2 to the electromagnetic coil 20 during the period B12, and the electromagnetic pump 1 receives a predetermined flow rate (for example, 6.63 milliliters per minute ± 7%, and a permissible error between manufacturing processes ± 2 to 2.5%). , 23.5 ± 0.05 V DC, 20 ° C.) only when the fixed resistor R is fully connected. Electromagnetic pumps outside this predetermined flow rate tolerance, 5, 8, measure the flow rate Q ₃ corresponding to the newly added resistance R _3, a coupling point P ₃ on the diagram lines of both , Said P
Repeat the procedure to determine the curvature of a circle passing through the _1, P ₂ again,
Select the fixed resistor to be added. In turn, measure the flow rate Q ₃ corresponding to the newly added resistance R ₃ in the middle out of the two measurement points P ₁ and P _2, these three points P
_If an arc is assumed using ₁ , P ₂ and P ₃ and this arc is used as a connecting line between the measurement points P ₁ and P ₂ , there is no need to find the arc from the curve shown in FIG. By measuring and using the arc, it is possible to easily select a fixed resistor to be added as a modification of the two-point method. (4) Tables 10 to 12 show data obtained by the so-called one-point measurement method.

First, Table 10 shows that the flow rate Q when adding the additional resistance value R to the flow rate Q _O when the one-point measurement, that is, the additional resistance value R _O and no additional resistance value is used as a reference.
The rate of change of ₁ , ie the slope a of the diagram, is

[0070]

[Outside 10]

Thus, the cut side b is the flow rate value when the additional resistance value is OΩ. The converted flow rate indicating the relationship between the flow rate value Q and the additional resistance value x (R) is as follows: Q = b-ax Table 10 shows the variation in the actually measured flow rate. These are averaged in Table 2, which is the regression equation converted flow rate. In Table 11, a straight line parallel to the straight line obtained from the regression equation converted flow rate is shifted so as to pass through each measurement point of 0Ω in Table 10, and the flow rate at each measurement point obtained by the straight line is shown as a converted flow rate. Therefore, in Table 12, the measurement point 0Ω
Is 0.00.

Table 12 shows changes in the measured flow rate with respect to the reduced flow rate. That is, the error between the converted flow rate value and the actually measured data value is indicated by%, which proves that this error is large. The data shown in Tables 1 to 12 relating to the respective flow rates of (1) to (4) described in detail above indicate that the electromagnetic pump used in this experiment has the dimensions, accuracy, and other numerical values of its component parts within the allowable range. However, there is still the above-mentioned variation in the flow rate, although it is configured with a value close to the reference value. It is costly and economically difficult to select and configure components that are close to the reference value of such an allowable range. In the assembled electromagnetic pump, the variation in the discharge flow rate characteristic, that is, the variation in the additional resistance value versus the flow rate change is further increased.

The data shown in Tables 1 to 12 of this experiment will be further described. (1) Table 1 as the variation in the discharge flow rate characteristics of the pump shown in Table 3 described above in, 3 [sigma] (sigma standard deviation, 3 [sigma] hereinafter referred Hensa) 100 parts per 3 [sigma] / x _m is ±
It is about 12%.

This is obtained from Tables 1 to 3, where n =
For 20 pumps, additional resistance values of 0.0, 2.0, 4.3,
The flow rate was measured for 6.2, 8.0, and 10.0Ω, and the variation was obtained. Sample (n = 20)
By dividing 3 times the standard deviation of the flow rate 3σ by the average value x _m of the flow rate, the maximum variation of the population can be obtained with a reliability of 99.7%.

In the actual calculation, the average value of the flow rate and the average value of the standard deviation for each additional resistance value are obtained, and the above 3σ / x
_It was determined by the formula of _m × 100. That is, the average value of x _m = 6.960 ml / _M, the average value of HENSAσ = 0.2774 ml / M, 3σ / x m × 100 = 11.96% (2) Next, a straight line view in the so-called two-point measurement method When considered, 3σ + x _m is about ± 2%.

That is, from the data in Table 4, a diagram was obtained by the two-point measurement method, and the flow rate at each resistance value was roughly calculated from the diagram, and the converted flow rate in Table 5 was obtained. Table 6 shows the rate of change of the actually measured flow rate, that is, the error rate. That is, the difference between the diagram (straight line) obtained by the two-point measurement method and the actual measured flow rate is the flow rate setting accuracy of the pump.

In the actual calculation, the average value of the flow rate and the average value of the standard deviation for each additional resistance value are obtained, and the variation of the population due to 3σ is estimated. Table 6, since data is represented by the calculated value and the error rate (%), the estimated maximum variation is obtained in the population at 3 [sigma] + x _m. the average value of x _m 0.0893 (%), therefore the average value of δ 0.6256 (%), the _{3σ + x m = ± 1.966%} (3) the two-point measuring method, Table 7 that the diagrams and curves
Table 9 is calculated by the method described in the above (2), and is obtained from Table 9 as follows.

3σ + x _m = ± 1.69% (4) In the so-called one-point measurement method shown in Tables 10 to 12, 3σ + x _m = about ± 4%. From the average value of the data in Table 10, the slope of the resistance-flow rate diagram was determined, and the slope at that time was assumed to be constant, and the approximate flow rate table 11 was calculated by calculating the flow rate at each additional resistance value. The difference from the measured flow rate in Table 10 is the setting accuracy of the pump.

In the actual calculation, the average value of the flow rate and the average value of the standard deviation at each additional resistance value are obtained, and the variation of the population due to 3σ is estimated. Assuming that the sample taken in this case is n, the standard deviation is obtained by σ _n-1 . Note that the standard deviation described in each table in the specification of the present application is σ _n , which means that the flow rate measurement corresponding to the additional resistance value was performed by regression analysis with the measured flow rate for the sample n = 20 or other application. In comparison with the converted flow rate value according to the method of the invention,
It is because it is analyzed and explained. It is well known that the value of σ _n-1 has a very small increase with respect to the standard deviation σ _n . Table 12 shows an error (%) between the approximate value of the flow rate shown in Table 11 and the actually measured value shown in Table 10. Therefore, the maximum variation is estimated at 3σ + x _m .

From Table 12, it can be seen that the average value of x _m -0.688 (%),
The average value of σ is 1.5574 (%). Therefore, 3σ + x _m = ± 3.98 (%). As described above, in the one-point measurement method (4), 3σ +
x _m ≒ ± 4 (%), and (2) of the present invention,
Compared with the two-point measurement method of (3), it is 2.0 times and 2.3 times, respectively.
The error is magnified 5 times.

Therefore, when the one-point measuring method (4), which is the prior art, is used, the defective rate becomes high, which requires time and labor for readjustment and the like, resulting in uneconomical effects. Rather, the fact that there are relatively many pumps with flow rates that exceed the allowable range between manufacturing processes
This means that the rejection rate will be high, and if the rejection rate is, for example, 100 PPM, even if the product of this production lot passes the shipping inspection and is brought to the market, the defective product will still have the same rate May occur, and there remains a problem in quality assurance, and there is a great concern that its reliability will be impaired.

When the flow rate is adjusted to a predetermined flow rate using the two-point measurement method (2) or (3) according to the present invention, the error of the converted flow rate with respect to the actually measured flow rate is 1.69 to 1.96%, which is the allowable flow rate. Since it falls within the range, there is almost no defect rate. As described above, the method for manufacturing a fuel supply electromagnetic pump for an oil combustor according to the present invention is highly reliable in securing the discharge flow rate to a predetermined value as described above, and thereby, readjustment and the generation of market complaints are caused. And provides a high economical advantage.

The flow rate adjustment measurement during the manufacturing process of such an electromagnetic pump is performed by at least 20 or more flow rate adjustment measurement / inspection devices (hereinafter simply referred to as inspection devices).
From the flow measurement described above, the calculation of various equations accompanying this, from the selection of an additional fixed resistor to be adjusted to an allowable range of a predetermined flow rate,
Everything from the confirmation of the flow rate after installation to the recording of the flow is accompanied by computer processing, saving labor and labor,
The processing time is very short and the working time is also reduced. It can be automated, including loading and unloading of the electromagnetic pump from the inspection device and connection and disconnection of the power supply.

Although the flow meter or the flow measuring device is a precision flow measuring device of an instantaneous reading type, the mounting space is large, very expensive, and in the case of the present application, the electromagnetic pump is small as described above. In some cases, the flow rate measurement device is not suitable for measuring the flow rate. As the flow rate measurement device used in the present invention, for example, a burette tube is used. Thus, the time required to fill a predetermined volume, for example, 5 to 10 milliliters, is measured by a solenoid valve, a photoelectric sensor, an hour meter, and the like.
A method of calculating the flow rate instantly by a computer is adopted.

The time required for the flow rate measurement is represented by the additional resistance value R
₁ and R ₂ are 3 minutes including the flow rates Q ₁ and Q ₂ and the flow rate Q when the selected fixed resistor R is connected, and three times including the incidental time.
If this is divided by 0 units, it is 9 seconds per unit. If the measurement, adjustment, and confirmation of the flow rate are performed sequentially, there is ample time even if the electromagnetic pump is manually attached to and detached from the inspection device.

That is, 1/20 of the time required to process each unit manually is sufficient, and therefore, the two-times described in Tables 4 to 6 of the above (2) and Table 9 of the above (2) of the present invention are sufficient. In the point measurement method, although the flow rate measurement including the confirmation is performed three times as described above, Table 10 to Table 12 of the above (4) are used.
There is only a time difference of only a few seconds per pump as compared with the flow adjustment setting method of performing two flow measurements including one measurement and flow rate confirmation in the conventional one-point measurement method as described in the above section. . However, this two-point measurement method has the advantage that the flow rate adjustment error is extremely small as described above, and substantially falls within the allowable range of the predetermined flow rate, which is satisfied, and the reliability in quality assurance is extremely high. As described above, the time required for the work of measuring, adjusting, setting, and confirming the flow rate is almost a matter of a few seconds compared to the prior art, and requires little work such as readjustment setting. It is economical because tolerances for parts constituting the pump, dimensional accuracy, and other standard values are not stricter and cost is not increased.

[0087]

As described above, the method of manufacturing a fuel supply electromagnetic pump for an oil combustor using the so-called two-point measuring method according to the present invention has two measuring points larger than the resistance value expected as an additional resistor. By selecting and measuring a small resistor, that is, a resistor closer to the lower limit and closer to the upper limit, the two measurement points are connected by a straight connection line, and a predetermined resistance value is obtained by using the connection line. As described above, the flow rate adjustment error is extremely small, substantially falls within the allowable range of the predetermined flow rate, and has the advantage of satisfying this, and having extremely high quality assurance reliability, flow rate measurement, adjustment, setting,
The time required for the confirmation work is also determined by a resistance circuit having two resistors with two measurement points switchably interposed, and the confirmation of pass / fail of the temporarily connected resistor is also performed by switching from this resistance circuit. As compared with the prior art, the difference is almost no more than a few seconds, and it requires little trouble such as readjustment setting, and the tolerance of parts and dimensional accuracy and other standard values constituting the pump. It is economical because it does not increase the cost and increase the cost.

In the method of manufacturing the electromagnetic pump according to the present invention, the selection of the additional resistance value and the operation of confirming the predetermined flow rate of the pump in response to the selection all involve computer processing, which saves labor and labor and improves efficiency. Cost reduction can be measured at the same time.

[0089]

[Table 1]

[0090]

[Table 2]

[0091]

[Table 3]

[0092]

[Table 4]

[0093]

[Table 5]

[0094]

[Table 6]

[0095]

[Table 7]

[0096]

[Table 8]

[0097]

[Table 9]

[0098]

[Table 10]

[0099]

[Table 11]

[0100]

[Table 12]

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a method for adjusting and setting a discharge flow rate of an electromagnetic pump to a predetermined value according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a partial cross section of an example of a fuel supply electromagnetic pump for petroleum combustion equipment, which is an object of the present invention in FIG.

FIG. 3 is a plan view showing a terminal portion of the electromagnetic pump of FIG. 2;

FIG. 4 is a graph showing the relationship between the magnetic force generated by the electromagnetic coil of the electromagnetic pump in which the horizontal axis represents the additional resistance value and the vertical axis represents the ampere-turn.

FIG. 5 is a diagram showing the relationship between the two values in an electromagnetic pump, in which the horizontal axis indicates the additional resistance value and the vertical axis indicates the discharge flow rate.

FIG. 6 is a graph showing the relationship between the two values in an electromagnetic pump having an additional resistance value on the horizontal axis and a discharge flow rate on the vertical axis, obtained by a regression line by regression analysis.

FIG. 7 is a flowchart of a manufacturing method for adjusting a discharge amount of an electromagnetic pump and selecting an additional resistor according to the present invention.

FIG. 8 is a flowchart of a manufacturing method for adjusting a discharge amount of an electromagnetic pump and selecting an additional resistor according to the present invention.

[Explanation of symbols]

1 electromagnetic pump 2 discharge quantity inspection driving circuit 3 relays 4 relays 5, 6 terminal 7 resistor circuit a, b, c, d terminal R _1, R ₂ fixed resistor 11 terminals A 12 pin B 13 terminal C 16 Resistors R 20 electromagnetic coil

Continuing on the front page (72) Inventor Teruo Misono 5-23-13 Ikegami, Ota-ku, Tokyo Taisan Industry Co., Ltd. (72) Inventor Yasutane Chiba 5-23-13 Ikegami, Ota-ku, Tokyo Taisan Industry Inside (72) Inventor Kenji Igarashi 5-23-13 Ikegami, Ota-ku, Tokyo Taisan Industry Co., Ltd. (56) References JP-B7-101033 (JP, B2) (58) Fields surveyed (58) Int.Cl. ⁷ , DB name) F04B 1/00-23/14 F04B 49/00-51/00

Claims (1)

(57) [Claims] 1. An electromagnetic coil which surrounds an outer periphery of a tubular cylinder on which a free reciprocating sliding free piston is fitted;
Terminals A and B for connecting and fixing both ends of the winding of the electromagnetic coil, respectively, and a terminal C for connecting from the one terminal A with a fixed resistor interposed therebetween. A driving pulse-like current supplied from a driving circuit provided in the vessel is connected between the terminal B and the terminal C not connected to the terminal C, and is energized between the terminals C to maintain a predetermined fuel discharge amount; When the drive pulse is energized between the terminals A and B without passing through the fixed resistor, a fuel supply electromagnetic pump for an oil combustor designed and manufactured in advance so as to exceed the predetermined fuel discharge amount. When supplying a drive pulse from the discharge flow rate inspection drive circuit between the terminals A and B, which is equal to or preliminarily adjusted by a drive circuit to be provided in the terminal A, the discharge flow rate of the pump is supplied to the terminal A. In order to select and adjust and add an additional fixed resistor, the resistance value of the fixed resistor group having different resistance values is larger and smaller than the resistance value expected as the additional fixed resistor, that is, Two measurement points of the discharge flow rate of the electromagnetic pump corresponding to each of the switched attached fixed resistors are measured and added by a resistance circuit in which two attached fixed resistors closer to a lower limit and an upper limit are switchably interposed. Two measurement points are set on the resistance-flow rate diagram, and the two measurement points are connected by an arbitrary straight line.
A predetermined resistance value is obtained from an intersection of a line indicating a predetermined fuel discharge amount on the additional resistance-flow rate diagram and the connection line, and the fixed resistance is set so as to fall within an allowable range of the predetermined fuel discharge amount. A resistor having a resistance value approximate to the predetermined resistance value is selected from the group of devices, and the selected resistor is temporarily connected between the terminal A and the terminal C. From the remaining terminals B and C
Only when it is confirmed that the fuel discharge amount falls within the allowable range by supplying a drive pulse during the period, the temporarily connected selected resistor is permanently connected as an additional fixed resistor. A method of manufacturing a fuel supply electromagnetic pump for petroleum combustors, which is capable of maintaining a predetermined fuel discharge amount within an allowable range and being compatible when assembled into a fuel vessel.