JP3282088B2 - Method and apparatus for manufacturing fluid flow control jet - Google Patents

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 for regulating a flow rate of a fluid (in other words, a metering jet).
and is used as a fuel jet or an air jet in a carburetor for controlling the amount and concentration of an air-fuel mixture supplied to an engine.

[0002]

2. Description of the Related Art A flow control jet conventionally used in a vaporizer is shown in FIG. 20 is a control jet main body, along the longitudinal direction XX thereof, an inlet side flow path 20A,
The control hole 20B and the outlet side flow path 20C are continuously formed. In the inlet side flow path 20A, a conical hole 20D formed in the rear end portion is continuously provided toward the control hole 20B, and the outlet side flow path 20C has a conical hole 20E formed in the front end portion facing the control hole 20B. It is installed continuously. And the control hole 2
0B is formed by a straight hole having a constant diameter A, and the control hole 20B is formed by a straight drill. Generally, fuel or air flowing through the carburetor flows in from the inlet-side flow path 20A, the amount of which is regulated by the control hole 20B, and the regulated fluid flows out from the outlet-side flow path 20C. That is, the larger the diameter of the control hole 20B, the more the amount of the large fluid is regulated, and the smaller the diameter of the control hole 20B, the smaller the amount of the fluid.

[0003]

As described above, the amount of fuel and the amount of air flowing through the carburetor are regulated by the control hole 20B of the flow control jet composed of the fuel jet and the air jet. . Here, in the conventional flow control jet, since the control hole 20B is formed by a straight hole, it is difficult to obtain a flow control jet in which the control flow controlled by the control hole 20B is close. Was. This means that the diameter of the drill for machining the control hole 20B can be set to 0.1 without variation.
This is because it is difficult to prepare every 01 mm. In particular, this problem remarkably occurs in a small diameter region where the diameter of the control hole 20B is about 0.35 mm. The control flow rate of the flow control jet during mass production needs to be within a certain flow rate tolerance (for example, within ± 1%) from the viewpoint of reducing harmful exhaust gas components and reducing fuel consumption. According to the fact that the control hole 20B is formed by a straight hole, the control hole 20B completely depends on the diameter of the straight drill, and the variation in the diameter of the straight drill directly affects the control flow rate of the control hole 20B. give. And there is no means for correcting this variation. In view of the above, the management of straight drill diameters must be performed very carefully, which increases the cost of purchasing specially selected straight drills and the cost of managing drills, thereby increasing the production cost of flow control jets. Is not preferred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a flow rate of a fluid capable of obtaining an adjacent control flow rate extremely easily and obtaining a flow rate control jet having a very small variation width of flow rate tolerance. An object of the present invention is to provide a control jet manufacturing method and a manufacturing apparatus thereof.

[0005]

In order to achieve the above object, a flow control jet according to the present invention is a flow control jet having a control hole smaller than other flow passages in a longitudinal direction of a control jet body. A first step of introducing the pressure of the control hole 3 of the flow control jet J in the initial state and the pressure of the reference flow control jet into a differential pressure gauge and outputting a differential pressure signal value from the differential pressure gauge; 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 in accordance with a signal output from the ECU such that the differential pressure becomes zero or a predetermined value based on the pressure signal value. When;
A first feature of the present invention is a method for manufacturing a fluid flow rate control jet.

A flow control jet manufacturing apparatus includes a differential pressure measuring device for measuring a differential pressure between a flow control jet and a reference flow control jet, and an outer peripheral portion of a control hole of the flow control jet pressed by a punch. A press deformer for deforming the control hole in the reduction direction, and a drive signal E for outputting a drive signal to the press deformer.
A first pressure path for applying the pressure of the pressure source to the flow control jet, a second pressure path for applying the pressure of the pressure source to the reference flow control jet, and a flow control. A differential pressure gauge that introduces a pressure generated in the jet and a pressure generated in the reference flow control jet, and outputs the pressure difference as an electric signal to the ECU, and the pressure difference of the differential pressure gauge from the ECU is zero. Alternatively, a second feature is that a drive signal is output to the pressing and deforming machine so as to have a predetermined value, and the control hole is deformed in a reduction direction by a punch.

According to the first feature, the flow rate of the flow control jet is reduced by pressing the outer periphery of the control hole of the flow control jet with a punch so that the pressure difference from the reference flow control jet becomes zero. Processed by deforming in the direction. or,
According to the second feature, in addition to the action and effect of the first feature, the flow rate due to the pressure fluctuation of the pressure source required for measuring the flow rate of the flow control jet and the fluctuation of the environmental conditions where the flow control jet is arranged It is not affected by measurement errors.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a method of manufacturing a fluid flow control jet according to the present invention and an example of an apparatus for manufacturing the same will be described. J is
This is a flow control jet to be processed and is shown in FIGS. In the flow control jet J, an inlet-side flow path 2, a control hole 3, and an outlet-side flow path 4 are continuously formed along the longitudinal direction XX of the control jet main body 1. The inlet-side flow path 2 has a conical hole 2A formed at the rear end thereof connected to the control hole 3, and the outlet-side flow path 4 has a conical hole 4 formed at the front end.
A is connected to the control hole 3. And control hole 3
In the outer peripheral portion 1A of the control jet main body 1 corresponding to the above, guide holes 1 facing each other from the outer peripheral portion 1A toward the center.
B and 1B are drilled. The guide holes 1B, 1B must not pass through the control hole 3. Then, the fluid flowing in the control jet body 1 flows down to the inlet side flow path 2-the control hole 3-the outlet side flow path 4. In each of the flow paths and holes in the control jet body 1, the diameter A of the control hole 3 is the smallest.

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,
The frame 10B is directed upward from the side of the base 10A.
The column 10C extends laterally from the upper end of the frame 10B.
Grows. 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 disposed on the slide base 11. The slide table 12 has an upper column 12A
And a lower column 12B. A nut member 13 is fixedly disposed on the upper column 12A. Reference numeral 14 denotes a motor disposed on 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, at the time of forward rotation of the output shaft 14A at the time of forward rotation of the motor 14, the forward 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 it. On the other hand, when the output shaft 14A rotates in the reverse direction when the motor 14 rotates in the reverse direction,
The reverse rotation of 4A is transmitted to the nut member 13 via the male screw 14B, thereby moving the slide table 12 upward. Reference numeral 15 denotes a mounting jig disposed on the base 10A, and the flow control jet J is fixedly disposed in the mounting hole 15A. At this time, at least the outer peripheral portion 1A of the control jet main body 1 corresponding to the control hole 3 is attached to the mounting hole 1
Located outside 5A. In this example, the control jet J is inserted and arranged from the left opening of the mounting hole 15A, and the outer peripheral portion 1A corresponding to the control hole 3 is arranged to escape from the mounting hole 15A. Reference numeral 16 denotes a punch which 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 the tip thereof faces the upper guide hole 1B. On the other hand, the lower punch 16B is fixedly arranged on the mounting jig 15, and the front end thereof faces the inside of the lower guide hole 1B. The 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 control jet provided with a control hole 3M for controlling a flow to be a reference of the flow control jet J to be manufactured. The reference flow control jet M is the same as the mounting jig 15. It is attached to the attachment jig 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 are temperature,
Refers to conditions such as pressure.

Reference numeral 17 denotes a first measuring adapter for measuring the flow rate of the flow control jet J. The first measuring adapter 17 is connected to a pressure source 19 via a first pressure path 30. Note that measuring the flow rate means measuring the pressure. Reference numeral 31 denotes a second measurement adapter for measuring the flow rate (pressure) of the reference flow rate control jet M. The second measurement adapter 31 has a second pressure path 32 branched from the first pressure path 30. Connected. Reference numeral 33 denotes a known differential pressure gauge, into which pressures in the first pressure path 30 and the second pressure path 32 are introduced, converts the differential pressure into an analog signal, and outputs the analog signal to the ADC converter 20. Then, a differential pressure signal value is output from the ADC converter 20 to the ECU 21. The ECU 21 outputs a signal to the motor drive circuit 23 according to the differential pressure signal value. Then, from the motor drive circuit 23 toward the motor 14, the ECU 2
A drive signal corresponding to the output signal of No. 1 is output.

As described above, the flow control jet manufacturing apparatus detects each pressure generated by the flow control jet J and the reference flow control jet M as a pressure difference, and outputs an analog signal to the ADC converter 20. And a motor slide for pressing the outer peripheral portion of the control hole 3 of the flow rate control jet J in accordance with the output signal of the ECU 21 to deform the control hole 3 in the reducing direction. A press deformer P including a device 10, a slide base 11, a slide table 12, a motor 14, and a punch 16; and a motor drive for outputting a drive signal to the press deformer P based on a signal from the differential pressure measuring device S. And an ECU 21 including a circuit 23.

The flow control jet J is manufactured as follows. Flow control jet J in initial state
The diameter A of the control hole 3 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. Flow control jet J
Is inserted into the mounting hole 15A of the mounting jig 15, and the first measuring adapter 17 is engaged with the flow control jet J. In this state, the first pressure passage 30,
For example, a negative pressure is applied to the flow control jet J via the first measuring adapter 17. On the other hand, the reference flow 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 control jet M. In this state, for example, a negative pressure is applied to the reference flow control jet M from the pressure source 19 via the second pressure path 32 and the second measurement adapter 31 in the same manner as described above.
Then, in the first pressure passage 30, a pressure corresponding to the flow rate of the control hole 3 of the flow control jet J is generated, while in the second pressure passage 32, the control hole 3 of the reference flow control jet M is generated.
A pressure corresponding to the flow rate of M is generated. The respective pressures generated in the first pressure path 30 and the second pressure path 32 are introduced into the differential pressure gauge 33, and the differential pressure gauge 33
An analog signal corresponding to the differential pressure is output to the C converter 20. This corresponds to the first step.

The ECU 21 receives a differential pressure signal value corresponding to the differential pressure of the differential pressure gauge 33 from the ADC converter 20.
The ECU outputs a signal to the motor drive circuit 23 so that the differential pressure becomes zero or a predetermined value, and further outputs a drive signal from the motor drive circuit 23 to the motor 14. As described above, since the diameter of the control hole 3 of the flow control jet J in the initial state is formed to be larger than the finally required diameter, the ECU 21 and the motor drive circuit 23 move toward the motor 14 from the motor 21. 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 in a certain direction in accordance with a 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,
This rotation is transmitted to the nut member 13 from the male screw 14B of the output shaft 14A. According to the above, slide table 1
Numeral 2 moves downward according to the rotation of the motor 14, and the upper punch 16A moves downward corresponding to the downward movement of the slide table 12. Accordingly, the control hole 3 presses the bottom of the guide hole 1B toward the center of the control hole 3 in accordance with the downward movement of the upper punch 16A and the lower punch 16B in accordance with the downward movement of the upper punch 16A. The inner surface of the is deformed in the reducing direction, so that a desired flow rate can be obtained.

The change in the flow rate of the flow 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 control jet J was 0.45 mm. The flow rate of the flow control jet with respect to the pressing movement (from 0 to 0.25 mm) of the punch 16 is shown in Table 1 based on FIG.

[0016]

[Table 1]

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

[0018]

[Table 2]

On the other hand, the punch 16 can be attached to a numerical control press having a motor or the like, and the position of the punch 16 is commanded by numerical information corresponding to a signal output from a motor drive circuit. Can be controlled. According to this, the pressing position of the punch 6 is 0.001 mm
It is controlled precisely until. (Axial feed resolution is 0.00
According to the above, the pressing position of the punch 6 can be maintained very accurately at a desired position. That is, according to the results of FIG. 5, a flow rate of 0.1847 (gr / sec) is obtained at the punch pressing position of 0.2 mm, and when the punch 6 is further pressed and changed by 0.005 mm (punch pressing position of 0.205 mm). ), Flow rate is 0.1829
(Gr / sec) and the flow rate change is only 0.001
8 (gr / sec). The shape of the guide hole formed in the flow control jet is not limited to the embodiment, but may be any shape that can be pressed and deformed by the punch, and the punch and the device for driving the punch are also limited to the embodiment. Not done.

The feature of the present invention is that a single flow control jet J to be manufactured, a reference flow control jet M targeted by the flow control jet J, and a single pressure source 19 applied for flow measurement, The pressure generated in the pressure source 19 is applied to the flow rate control jet J via the first pressure path 30 and to the reference flow rate control jet M via the second pressure path 32 branched from the first pressure path 30. And the flow control jet J and the reference flow control jet M are arranged under the same measurement environment (temperature, pressure, etc.). Further, the pressure generated by the flow rate flowing through the flow rate control jet J and the pressure generated by the flow rate flowing through the reference flow rate control jet M are detected by the differential pressure gauge 33, and the differential pressure signals are detected as E.
Output to the CU21.

According to the above, the pressures (corresponding to the flow rates) of the flow control jet J and the reference flow control jet M are not affected by the pressure fluctuation of the pressure source 19 and the fluctuation of the measurement environment at all. Control jet J, M
Is accurately introduced into the differential pressure gauge 33, and an accurate differential pressure signal can be output to the ADC converter 20. Therefore, an accurate drive signal can be output from the ECU 21 to the motor 14 as a pressing and deforming machine, and the flow rate of the flow rate control jet J can be more accurately determined.
It can be manufactured according to. The second pressure path 32
May be directly connected to the pressure source 19 without branching from the first pressure path 30.

[0022]

As described above, according to the present invention, the control hole of the flow rate control jet is adjusted so that the pressure difference based on the flow rate flowing through the reference flow rate control jet becomes zero or a predetermined value. Is moved to finely adjust the effective area continuously and steplessly, so that it is possible to provide a flow control jet capable of controlling an adjacent flow rate and to suppress the flow rate jet to an extremely small flow tolerance. In addition, the flow control jet and the reference flow control jet were arranged in the same measurement environment, the pressure used for flow measurement was the pressure generated by the same pressure source, and a single differential pressure gauge was used. According to what was used, the flow rate of each flow control jet can be measured more accurately,
As a result, the control hole of the flow control jet can be adjusted (deformed) very accurately, and an accurate flow control jet can be obtained. By using such a flow jet for a vaporizer, a great effect of reducing harmful exhaust gas components and fuel consumption can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a flow control jet used in a method of manufacturing a flow control jet of the present invention.

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

FIG. 3 is a system diagram showing an example of an apparatus suitable for implementing the flow control jet manufacturing method 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 control jet.

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

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

[Explanation of symbols]

 J Flow control jet 3 Control hole M Reference flow control jet 16 Punch 19 Pressure source 21 ECU 30 First pressure path 32 Second pressure path 33 Differential pressure gauge P Press deformation machine

Claims (2)

(57) [Claims] 1. A flow control jet having a control hole reduced in size in a longitudinal direction of a control jet main body from other flow passages, wherein a pressure in a control hole 3 of a flow control jet J in an initial state and a reference flow control jet M Pressure and the differential pressure gauge 3
3 to output the differential pressure signal value from the differential pressure gauge 33.
The outer peripheral portion 1A of the control hole 3 of the flow control jet J is punched in accordance with a signal output from the ECU 21 so that the differential pressure becomes zero or a predetermined value based on the differential pressure signal value in the first step. And a second step of deforming by pressing; 2. An apparatus for manufacturing a flow control jet, comprising: a differential pressure measuring device for measuring a differential pressure between a flow control jet and a reference flow control jet; The differential pressure measuring device includes a pressing deformer P that presses and deforms the control hole 3 in the reducing direction, and an ECU 21 that outputs a drive signal to the pressing deformer P. To the flow control jet J, the second pressure path 32 to apply the pressure of the pressure source 19 to the reference flow control jet M, the pressure generated in the flow control jet J, and the reference flow control jet M. And a differential pressure gauge 33 that outputs the generated pressure as an electric signal to the ECU 21. The ECU 21 controls the pressure difference of the differential pressure gauge 33 to be zero or a predetermined value. An apparatus for producing a fluid flow jet, wherein a motion signal is output to a pressing and deforming machine P, and a control hole 3 is deformed in a reducing direction by a punch 16.