JPH0953516A - METHOD FOR PRODUCING FLUID FLOW CONTROL JET AND APPARATUS FOR PRODUCING THE SAME - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a control flow rate that is close to each other and that has a small variation in flow rate tolerance. [Structure] The flow rate control jet J has a control hole 3 in the longitudinal direction XX of the control jet body 1. The first step is a flow rate measuring step, in which the flow rate of each of the flow rate control jet J and the reference flow rate control jet M is measured, and an electric signal corresponding to the flow rate is output to the ECU 21. The second process is a process for adjusting the control hole 3 of the flow rate control jet J. The flow rate signal value of the flow rate control jet J in the first process is compared with the flow rate signal value of the reference flow rate control jet M, and the ECU 21
Outputs a drive signal to the motor 14. The punch 16 is moved by this motor 14 and is pressed and deformed in a direction to reduce the effective area of the control hole 3 of the flow rate control jet J.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control jet (in other words, a metering o
In the vaporizer that controls the amount and concentration of the air-fuel mixture supplied to the engine, it is used as a fuel jet or an air jet that regulates the fuel amount and the air amount.

[0002]

2. Description of the Prior Art A flow control jet conventionally used in a vaporizer is shown in FIG. Reference numeral 20 is a control jet main body, and along the longitudinal direction X-X thereof, the inlet side flow passage 20A,
The control hole 20B and the outlet side flow passage 20C are continuously formed. In this inlet side flow passage 20A, a conical hole 20D formed at the rear end portion is continuously provided toward the control hole 20B, and in the outlet side flow passage 20C, a conical hole 20E formed at the front end portion is directed toward the control hole 20B. Will be serialized. Then, the control hole 2
OB is formed as a straight hole having a constant diameter A, and this control hole 20B is processed and formed by a straight drill. Generally, the fuel or air flowing through the vaporizer flows in from the inlet side flow passage 20A, the amount thereof is regulated by the control hole 20B, and the regulated fluid flows out from the outlet side flow passage 20C. That is, a large amount of fluid is regulated by increasing the diameter of the control hole 20B, and a small amount of fluid is regulated by decreasing the diameter of the control hole 20B.

[0003]

As described above, the amount of fuel and the amount of air flowing in the carburetor are regulated by the control hole 20B of the flow rate control jet consisting of the fuel jet and the air jet. . Here, in the conventional flow rate control jet, since the control hole 20B is formed by the straight hole, it is difficult to obtain a flow rate control jet in which the control flow rate controlled by the control hole 20B is close. It was This is because the diameter of the drill for processing the control hole 20B is 0.
This is because it is difficult to prepare every 01 mm. In particular, this problem remarkably occurs in the minute diameter region where the diameter of the control hole 20B is about 0.35 mm. The control flow rate of the flow rate control jet during mass production needs to be kept within a certain flow rate tolerance (for example, within ± 1%) from the viewpoint of reducing harmful exhaust gas components and reducing fuel consumption. Since the control hole 20B is formed by the straight hole, the control hole 20B is completely dependent on the diameter of the straight drill, and the variation of the diameter of the straight drill directly affects the control flow rate of the control hole 20B. give. And it has no means for correcting this variation. From the above, it is necessary to manage the diameter of the straight drill very carefully, which increases the purchase cost of the specially selected straight drill and the management cost of the drill, which increases the manufacturing cost of the flow control jet. Is not preferable.

The present invention has been made in view of the above-mentioned problems, and it is possible to obtain a control flow rate that is close to each other very easily, and to obtain a flow rate control jet having an extremely small variation in flow rate tolerance. It is an object of the present invention to provide a control jet manufacturing method and a manufacturing apparatus thereof.

[0005]

In order to achieve the above-mentioned object, a flow control jet according to the present invention is a flow control jet having a control hole which is smaller than other flow passages in the longitudinal direction of a control jet body. The first step of measuring the flow rate in the initial state of the control hole of the flow rate control jet and the flow rate of the reference flow rate control jet, the flow rate signal value of the control hole of the flow rate control jet in the first step, and the reference flow rate control jet The outer peripheral portion 1 of the control hole of the flow rate control jet is compared with the reference signal value and according to the signal output from the ECU.
The first feature is a method of manufacturing a fluid flow rate control jet, which comprises a second step of pressing and deforming A with a punch, and a second step.

Further, the flow control jet manufacturing apparatus includes a flow measuring device for measuring the flow rate of the flow control jet, and a press deformer for pressing the outer peripheral portion of the control hole of the flow control jet to deform the control hole in the contracting direction. And a ECU that outputs a drive signal to the press deformer, and the flow rate measuring device measures the flow rate of the reference flow rate control jet and the first flow rate measuring device that measures the flow rate of the flow rate control jet. A second flow rate measuring device, and the first flow rate measuring device comprises a pressure source, a first pressure path for applying the pressure of the pressure source to the flow rate control jet, and a first pressure path arranged in the first pressure path. And a flow meter, wherein the second flow rate measuring device is branched from a first pressure path between the pressure source and the first flow meter, and a second pressure path for applying the pressure of the pressure source to the reference flow control jet. And the second
A second flow meter disposed in the pressure path, and a flow rate jet manufacturing apparatus for a fluid, which outputs the flow rate measured by the first flow meter and the second flow meter to the ECU as an electric signal. Is the second feature.

According to the first feature, the flow rate of the flow rate control jet is deformed in the shrinking direction by pressing the outer peripheral portion of the control hole of the flow rate control jet with a punch based on the flow rate of the reference flow rate control jet. Let it be processed. Therefore, the effective area of the control hole can be extremely minutely and continuously reduced, and a control flow rate close to the control hole can be obtained.
Further, it is possible to provide a flow rate control jet which has a high measurement accuracy with a small variation width of flow rate crossings, because a measurement error caused by a change in the environment in which the flow rate control jet is arranged is eliminated.
Further, according to the second feature, the operation by the first feature,
In addition to the effect, it is not affected by the flow rate measurement error due to the pressure fluctuation of the pressure source necessary for measuring the flow rate of the flow rate control jet.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a method of manufacturing a fluid flow control jet and a manufacturing apparatus thereof according to the present invention will be described below. J is
It is a flow control jet and is shown in FIGS. The flow rate control jet J is the longitudinal direction X- of the control jet body 1.
The inlet side flow passage 2, the control hole 3, and the outlet side flow passage 4 are continuously formed along the X line. In this inlet side flow passage 2, a conical hole 2A formed at the rear end portion is continuously provided toward the control hole 3,
A conical hole 4A formed at the tip of the outlet-side flow path 4 is continuously provided toward the control hole 3. The outer peripheral portion 1A of the control jet body 1 corresponding to the control hole 3 is provided with guide holes 1B, 1B facing the center direction from the outer peripheral portion 1A and facing each other. The guide holes 1B, 1B must not penetrate the control hole 3. Then, the fluid flowing in the control jet body 1 flows down to the inlet side flow passage 2-control hole 3-outlet side flow passage 4. In each flow path and hole in the control jet body 1, the control hole 3 has the smallest diameter A.

The flow rate of the control hole 3 in the flow rate control jet J is adjusted as follows. Figures 3 and 4
This will be described below. 10 is a motor slide device,
Frame 10B from the side of base 10A upwards
The column 10C laterally from the upper end of the frame 10B.
Extends. Reference numeral 11 denotes a slide base attached to the frame 10B, and a slide table 12 that can move only in the vertical direction is movably arranged on the slide base 11. The slide table 12 is the upper column 12A.
And a lower column 12B, and the nut member 13 is fixedly arranged on the upper column 12A. Reference numeral 14 denotes a motor arranged in the column 10C. A male screw 14B is engraved on the outer periphery of the output shaft 14A of the motor 14, and the male screw 14B is screwed to the nut member 13. According to the above, for example, when the output shaft 14A rotates normally when the motor 14 rotates normally, the normal rotation of the output shaft 14A is transmitted to the nut member 13 via the male screw 14B, thereby moving the slide table 12 downward. Let On the other hand, when the output shaft 14A rotates in reverse when the motor 14 rotates in reverse, the output shaft 1
The reverse rotation of 4A is transmitted to the nut member 13 via the male screw 14B, thereby moving the slide table 12 upward. A mounting jig 15 is arranged on the base 10A, and the flow rate control jet J is fixedly arranged in the mounting hole 15A. At this time, at least the outer peripheral portion 1A of the control jet body 1 corresponding to the control hole 3 has the mounting hole 1
Located outside 5A. In this example, the control jet J is inserted and arranged from the opening on the left side of the mounting hole 15A, and the outer peripheral portion 1A corresponding to the control hole 3 is arranged so as to escape from the mounting hole 15A. Reference numeral 16 denotes a punch that presses the control hole 3 from the outer periphery to reduce and deform the control hole 3, and an upper punch 16A.
Is fixedly arranged on the lower column 12B of the slide table 12, and its tip end faces the upper guide hole 1B. On the other hand, the lower punch 16B is fixedly arranged on the mounting jig 15, and its tip end faces the lower guide hole 1B. This punch 16 and the guide hole 1 of the control jet body 1
The state with B is particularly shown in FIG.

M is a reference flow rate control jet provided with a control hole 3M for controlling a flow rate to be a reference of the flow rate control jet to be manufactured, and this reference flow rate control jet M is a mounting jig similar to the mounting jig. It is attached to the tool 15B in a similar state. This reference flow control jet M is preferably arranged under substantially the same environmental conditions as the flow control jet J to be processed. Environmental conditions refer to conditions such as temperature and pressure.

Reference numeral 17 denotes a first measuring adapter for measuring the flow rate of the flow rate control jet J. The first measuring adapter 17 is connected with a first flow meter 18 and a pressure source 19 via a first pressure passage 30. To be done. These first measurement adapter 1
7, the 1st pressure path 30, the 1st flowmeter 18, and the pressure source 19 comprise the 1st flow measuring device S1. Also, 31 is
The second measurement adapter 31 is a second measurement adapter for measuring the flow rate of the reference flow rate control jet M.
A second pressure passage 32 is branched from a first pressure passage 30 between the first flow meter 18 and the pressure source 19. Furthermore, a second flow meter 33 is arranged in this second pressure path 32. The second flow rate measuring device S2 is configured by the second measurement adapter 31, the second pressure passage 32, and the second flow meter 33.

The flow rate of the flow control jet J measured by the first flow meter 18 and the flow rate of the reference control jet M measured by the second flow meter 33 are converted into analog signals and input to the ADC converter 20. It Then, the flow rate signal value is output from the ADC converter 20 to the ECU 21. In the ECU 21, the flow rate signal value based on the first flow meter 18 from the ADC converter 20 is compared with the flow rate signal value based on the second flow meter 33, and a signal is output from the ECU 21 to the motor drive circuit 23. . Then, the drive signal corresponding to the output signal of the ECU 21 is output from the motor drive circuit 23 to the motor 14.

That is, the manufacturing apparatus of the flow rate control jet is a flow rate measurement apparatus for measuring the flow rate of the flow rate control jet J, which comprises a first flow rate measurement apparatus S1 and a second flow rate measurement apparatus S2; A press deforming machine including a motor slide device 10, a slide base 11, a slide table 12, a motor 14, and a punch 16 for pressing the outer peripheral portion of the J control hole to deform the control hole 3 in the contracting direction; The ECU 21 includes a motor drive circuit 23 that outputs a drive signal to the pressure deforming machine based on a signal from the measuring device.

The flow rate control jet J is manufactured by the following. The first step is a flow rate measurement step of measuring the flow rate of the prepared flow rate control jet J in the initial state and measuring the flow rate of the reference flow rate control jet M. The diameter A of the control hole 3 of the flow rate control jet J in this initial state is set to a diameter larger than the diameter at which the finally required flow rate is obtained. The size of this diameter is obtained in advance by a test. The flow rate control jet J is inserted and arranged in the mounting hole 15A of the mounting jig 15, and the first measurement adapter 17 is engaged with the flow rate control jet J. In this state, for example, a negative pressure is applied to the flow rate control jet J from the pressure source 19 via the first pressure passage 30 and the first measurement adapter 17. On the other hand, the first flow meter 18 measures the flow rate flowing through the control hole 3 of the flow rate control jet J, and this measurement value is AD.
It is introduced into the C converter 20, converted into a flow rate signal value, and EC
It is input to U21. The reference flow rate control jet M is inserted and arranged in the mounting hole 15C of the mounting jig 15B, and the second measurement adapter 31 is engaged with the reference flow rate control jet M. In this state, the reference flow rate control jet M from the pressure source 19 via the second pressure path 32 and the second measurement adapter 31.
For example, a negative pressure is applied in the same manner as described above. And the second
The flow meter 33 measures the flow rate flowing through the control hole 3M of the reference flow rate control jet M, and this measurement value is introduced into the ADC converter 20, converted into a flow rate signal value, and input to the ECU 21.

The second step is a final flow rate adjusting step of the control hole 3 of the flow rate control jet J. In the ECU 21,
The flow rate signal value of the flow rate control jet J input from the DC converter 20 and the reference flow rate signal value of the reference flow rate control jet M are compared and processed, and a signal is output to the motor drive circuit 23. A drive signal is output from the circuit 23 to the motor 14. As described above, since the diameter of the control hole 3 of the flow rate control jet J in the initial state is formed to be larger than the diameter finally required, the ECU 21 and the motor drive circuit 23 are directed toward the motor 14. The output drive signal is a signal for determining and instructing the amount by which the punch 16A is moved downward to press the control hole 3 to deform it in the contraction direction and reduce the effective area of the control hole 3. The motor 14 rotates by a predetermined amount in one direction in response to the drive signal from the motor drive circuit 23. According to this, the output shaft 14A rotates in synchronization with the rotation of the motor 14, and this rotation is Output shaft 14A
Is transmitted from the male screw 14B to the nut member 13. According to the above, the slide table 12 moves downward in accordance with the rotation of the motor 14, and the punch 16A on the upper side.
Corresponds to the downward movement of the slide table 12 and moves downward. Therefore, the control hole 3 presses the bottom of the guide hole 1B toward the center of the control hole 3 by the upper punch 16A and the lower punch 16B according to the downward movement of the upper punch 16A. The inner surface of the is deformed in the contraction direction, and thereby a desired flow rate can be obtained. In other words, the flow rate of the control hole 3 of the flow rate control jet J prepared in the first step is measured, the flow rate of the reference flow rate control jet M is measured, and the target is calculated based on the flow rate measurement in the second step. The punch is corrected to move to obtain the flow rate, and the control hole 3 of the flow rate control jet J is moved.
The effective area is reduced.

The change in the flow rate of the flow rate control jet with respect to the pressing movement of the punch will be described more specifically with reference to FIG. In this test, the diameter of the control hole 3 of the flow rate control jet J was 0.45 mm. The flow rate of the flow rate control jet with respect to the pressing movement of the punch 16 (up to 0 to 0.25 mm) is shown in Table 1 based on FIG.

[0017]

[Table 1]

Table 2 shows the decrease in the flow rate at intervals of 0.05 mm during the pressing movement from 0 to 0.25 mm.

[0019]

[Table 2]

On the other hand, the punch 16 can be attached to a numerical control press equipped with a motor, etc., and the position of the punch 16 is commanded by numerical information corresponding to the signal output from the motor drive circuit. Can be controlled. According to this, the pressing position of the punch 6 is 0.001 mm
It is controlled accurately up to. (Axial feed resolution is 0.00
According to the above, the pressing position of the punch 6 can be maintained extremely accurately at a desired position. That is, according to the result of FIG. 5, a flow rate of 0.1847 (gr / sec) was obtained at the punch pressing position 0.2 mm position, and when the punch 6 was further pressed and changed (punch pressing position 0.205 mm). ), The flow rate is 0.1829
(Gr / sec), and the flow rate change is only 0.001
It can be kept at 8 (gr / sec). The shape of the guide hole formed in the flow rate control jet is not limited to the embodiment, and may be any shape as long as it is pressed and deformed by the punch, and the punch and the device for driving the punch are also limited to the embodiment. Not done.

Further, the feature of the present invention is that the flow rate control jet J to be produced and the reference flow rate control jet M targeted by the flow rate control jet J are provided with a single pressure source 19 for measuring the flow rate. And the pressure generated in the pressure source 19 is
The addition to the flow rate control jet J via the first pressure path 30 and the addition to the reference flow rate control jet M via the second pressure path 32 branched from the first pressure path 30. Also, the flow rate control jet J and the reference flow rate control jet M are arranged in the same measurement environment (temperature, pressure, etc.). It is. According to the above, the flow rate measurement of the flow rate control jet J measured by the first flow meter 18 and the flow rate measurement of the reference control jet M measured by the second flow meter 33 are performed by the pressure source 1
It is possible to measure the flow rates of the respective control jets J and M very accurately and output them to the ADC converter 20 without being affected by the pressure fluctuation of 9 and the fluctuation of the measurement environment. Therefore, an accurate drive signal can be output from the ECU 21 to the motor 14 as a press deformer, so that the flow rate of the flow rate control jet J can be manufactured more accurately in accordance with the reference flow rate control jet M. The second pressure passage 32 may be directly connected to the pressure source 19 without branching from the first pressure passage 30.

[0022]

As described above, according to the present invention, the control hole of the flow rate control jet is moved relative to the flow rate of the reference flow rate control jet by moving the pressing position of the punch to continuously and effectively reduce its effective area. Since it is finely adjusted in stages, it is possible to provide a flow rate control jet capable of controlling the flow rate in the vicinity, and it is possible to suppress the flow rate tolerance to an extremely small value. According to the fact that the flow rate control jet and the reference flow rate control jet are arranged under the same measurement environment, and the pressure used for flow rate measurement is generated by the same pressure source, It is possible to more accurately measure the flow rate of, and by this, extremely accurate adjustment processing (deformation) of the control hole of the flow control jet can be performed, and an accurate flow control jet can be obtained. By using such a flow rate jet in the carburetor, it is possible to achieve great effects of reducing harmful exhaust gas components and reducing fuel consumption.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a flow control jet used in a method of manufacturing a flow control jet of the present invention.

FIG. 2 is a vertical sectional view taken along the line YY of FIG.

FIG. 3 is a system diagram showing an example of an apparatus suitable for carrying out the method for manufacturing a flow rate control jet of the present invention.

FIG. 4 is a longitudinal sectional view of a main part of the punch of FIG. 3 and a control hole of a flow rate control jet.

FIG. 5 is a diagram showing the relationship between the push movement of the punch and the flow rate of the flow rate control jet.

FIG. 6 is a vertical sectional view showing a conventional flow control jet.

[Explanation of symbols]

 J Flow rate control jet 3 Control hole M Reference flow rate control jet S1 First flow rate measuring device S2 Second flow rate measuring device 16 Punch 18 First flow meter 19 Pressure source 21 ECU 30 First pressure path 32 Second pressure path 33 Second flow rate Total

Claims (2)

[Claims] 1. A flow control jet J having a control hole reduced in size from other flow passages in the longitudinal direction of the control jet main body, wherein the flow rate of the flow control jet J in the initial state of the control hole 3 is measured, and a reference flow rate is also measured. The first step of measuring the flow rate of the control jet M, the flow rate signal value of the control hole 3 of the flow rate control jet J in the first step, and the reference signal value of the reference flow rate control jet M are compared and output from the ECU 21. A second step of pressing and deforming the outer peripheral portion 1A of the control hole 3 of the flow rate control jet J with the punch 16 according to the signal;
A method of manufacturing a fluid flow control jet of a fluid. 2. The flow control jet manufacturing apparatus comprises a flow rate measuring apparatus for measuring the flow rate of the flow control jet, and the control hole 3 of the flow control jet J is pressed to deform the control hole 3 in the contracting direction. The flow rate measuring device includes a pressure deforming device and an ECU 21 that outputs a drive signal to the pressure deforming device. The flow rate measuring device includes a first flow rate measuring device S1 that measures the flow rate of the flow rate control jet J, and a reference flow rate control device. Jet M
And a second flow rate measuring device S2 for measuring the flow rate of
The first flow rate measuring device S1 includes a pressure source 19 and a pressure source 1.
First pressure passage 30 for applying the pressure of 9 to the flow control jet J
And a first flow meter 18 arranged in the first pressure path 30,
The second flow rate measuring device S2 is constituted by the pressure source 1
And a second pressure passage 32 branching from a first pressure passage 30 between the first flowmeter 18 and the first flowmeter 18 and applying the pressure of the pressure source 19 to the reference flow control jet M. And a second flow meter 33, and the flow rate measured by the first flow meter 18 and the second flow meter 33 is output to the ECU 21 as an electric signal. apparatus.