KR20060005583A - Correction method for uniform velocity cam and pulseless diaphragm pump using it - Google Patents

Abstract

The present invention relates to a constant velocity cam correction method and a pulsation metering pump using a constant velocity cam, comprising a drive motor mounted to a housing, a worm gear operated by receiving a driving force of the drive motor, and a worm wheel fitted to the worm gear. The worm wheel shaft and the worm wheel shaft rotated by the transmission of the driving force of the drive motor, respectively formed on both ends of the worm wheel shaft of the elliptical cam shape is rotated and mounted so as to have a phase difference of 180 ° angle between each other, the outer shape of the elliptical shape is not formed in the target shape The first / second constant speed cam mounted on the worm wheel shaft through rework correction by operation of the correction device using a three-dimensional processing device, the bearing that is rotationally pressurized by the operation of the first / second constant speed cam, A slider mounted to be slidable under pressure, and a diaphragm interlocked with the slider to suck and discharge fluid.

Cam, pulsation free, metering pump, calibration, chamber

Description

Non-pulsation metering pump using constant velocity cam correction method and constant velocity cam {CORRECTION METHOD FOR UNIFORM VELOCITY CAM AND PULSELESS DIAPHRAGM PUMP USING IT}

1 schematically shows a drive of a metering pump according to the prior art;

FIG. 2 is a graph showing the pulsation waveform of the flow rate discharged from the metering pump of FIG. 1. FIG.

Figure 3 schematically shows a metering pump to which a constant velocity cam is applied.

4 shows the pulsation waveform of FIG.

Figure 5 is a perspective view schematically showing a pulsation-free metering pump according to a preferred embodiment of the present invention.

6 is an exploded perspective view of FIG. 5;

7 is a side cross-sectional view of FIG.

8 shows a graph output according to a contact position of a constant velocity cam and a bearing.

9 shows a constant velocity graph.

10 is a diagram showing a constant velocity graph before correction.

Fig. 11 shows a constant velocity graph after correction.

12 is a flow chart schematically showing a constant speed cam correction method of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 ... drive motor 11 ... housing

20.Worm Gear 21.Worm Wheel

30.Worm wheel shaft 40 ... First constant speed cam

50 ... 2nd constant speed cam 60 ... Compensation device

70 ... Bearing 80 ... Slider

90 diaphragm

The present invention relates to a constant velocity cam correction method and a pulsation metering pump using a constant velocity cam. More specifically, when the output pulsation waveform of the constant velocity cam is not a desired pulsation waveform, the constant velocity cam using a machining center The present invention relates to a constant velocity cam correction method for calibrating a constant velocity cam by recalibration and a pulsation-free quantitative pump using the constant velocity cam.

In general, the metering pump refers to a pump capable of producing a high pressure at a low speed and accurately discharging a flow rate per unit time by reciprocating a piston, a diaphragm, or the like through a cam shaft.

These metering pumps must be supplied quantitatively and reliably, with the desired amount of the user being not significantly affected by pressure.

Since the metering pump repeats suction and discharge by the reciprocating motion of the piston, it is always accompanied by a pulsation on the discharge side.

1 is a view schematically showing a driving unit of a metering pump according to the prior art, and FIG. 2 is a graph showing a pulsation waveform of a flow rate discharged from the metering pump of FIG. 1.

1 and 2, the metering pump 1 according to the prior art is mounted so that the eccentric cam 3 and the eccentric cam 3, which are rotationally operated by the driving of the drive motor, are embedded therein and the eccentric cam ( 3) and a plunger 7 which is rotated and driven by rotation of 3) and a plunger 7 which is pressed and slid by rotational pressure of the bearing 5 and sucks and discharges a flow rate.

The metering pump 1 according to the prior art having such a configuration, by the operation of the eccentric cam 3 by the drive of the drive motor, to convert the power of the drive motor to a reciprocating motion to discharge the flow rate.

The pulsation waveform by the eccentric cam 3 is shown as a sine wave as shown in FIG. The sine wave of the pulsating waveform is formed by the eccentric cam 3 consisting of a circular body having an eccentric amount to form a sine wave, which causes pulsation in the discharge flow rate.

Due to the occurrence of pulsation, the conventional metering pump 1 has a problem in that the instantaneous flow rate continuously changes, and an inertia resistance is generated in the discharge pipe due to the inertia of the pulsation. In addition, the discharge amount is increased due to the inertia due to the pulsation, there is a problem that the quantitative transfer of the flow rate increases.

In order to improve the problems of the conventional metering pump, a metering pump to which the constant velocity cam is applied has been proposed.

3 is a view schematically showing a metering pump to which a constant velocity cam is applied, and FIG. 4 is a view showing the pulsation waveform of FIG. 3.

As shown in FIGS. 3 and 4, the metering pump 2 to which the constant velocity cam according to the prior art is applied includes a constant velocity cam 4 and a constant velocity cam 4 which are rotated by driving of a driving motor not shown. And a plunger 8 that sucks and discharges the flow rate by the driving force transmitted through the bearing 6 and the bearing 6 pressurized by the rotation of 4).

With this configuration, the metering pump 2 to which the conventional constant velocity cam is applied causes the constant velocity cam 4 to drive the plunger 8 at a constant speed so that the discharge flow rate is discharged at constant speed.

However, as shown in FIG. 4, the fixed flow pump 2 is applied with the constant velocity cam, so that the discharge flow rate also flows at the constant velocity because the constant velocity cam 4 drives the plunger 8 at a constant velocity. If the discharge section is present in the nature of the suction section is present, there is a problem that can be obtained without continuous pulsation.

The present invention has been made to solve the above problems, and when the output pulsation waveform of the constant velocity cam is not the desired pulsation waveform, the constant velocity cam is recalibrated through the recalibration of the constant velocity cam using the machining center. It is an object of the present invention to provide a constant velocity cam correction method and a pulsation metering pump using the constant velocity cam.

Pulsation-free pulsation metering pump using the constant velocity cam of the present invention for achieving the above object, a drive motor mounted to the housing; A worm gear that is operated by receiving a driving force of the driving motor; A worm wheel shaft mounted to the worm gear and rotatably operated by transmission of a driving force of the driving motor; Each end of the worm wheel shaft is formed in an elliptical cam shape and rotated to have a phase difference of 180 ° with each other. When the elliptical shape is not formed as a target shape, it is reworked by operation of a compensator using a three-dimensional processing device. A first / second constant speed cam mounted to the worm wheel shaft through the rim; A bearing pressurized by operation of the first / second constant speed cam; A slider mounted to slide under pressure of the bearing; And discharging means interlocked with the slider to suck and discharge the fluid.

In the present invention, the correcting apparatus receives a graph of a target pulsation waveform to obtain the discharge fluid, receives a graph of the output pulsation waveform obtained through the operation of the first / second constant speed cam, A correction unit for correcting and programming when a target pulsation waveform graph and the output pulsation waveform graph are different; And a three-dimensional processing apparatus for receiving the correction data of the correction unit and reprocessing the elliptical shape of the first / second constant speed cam.

In the present invention, the three-dimensional processing apparatus is characterized in that the machining center.

In the present invention, the three-dimensional processing apparatus is characterized in that the wire cutting machine.

The constant speed cam correction method of the present invention comprises the steps of: (a) preparing a target pulsation graph to correspond to the desired pulsation amount of the metering pump; (b) manufacturing a first / second constant speed cam mounted on a worm wheel shaft that is interlocked by operation of the drive motor of the metering pump and pressurizing a bearing mounted to have a phase difference for pulsation reduction; (c) outputting an output pulsation graph of the first / second constant velocity cam of step (b); (d) comparing the target pulsation graph of step (a) with the output pulsation graph output from the first / second constant velocity cam of step (c); (e) If the target pulsation graph of step (d) is different from the output pulsation graph output from the first / second constant velocity cam, the output pulse value of the first / second constant velocity cam is converted into the target pulsation. Correcting with a graph value; And (f) inputting the output graph value of the corrected first / second constant speed cam of step (e) to a three-dimensional processing apparatus to correct the elliptical appearance of the first / second constant speed cam. It characterized in that it comprises a.

In the present invention, the step (d) may include: (d1) measuring an angle difference between the target pulsation graph and the pulsation graph output from the first / second constant velocity cam; (d2) calculating a correction angle between the target pulsation graph of step (d1) and the pulsation graph of the manufactured first / second constant velocity cam; And (d3) correcting a program input to the three-dimensional processing apparatus through the calculated angle of correction of step (d2) to correct the elliptical shape of the first / second constant speed cam. It is done.

Hereinafter, a constant velocity cam correction method and a non-pulsation metering pump using a constant velocity cam according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

Figure 5 is a perspective view schematically showing a pulsation-free metering pump according to a preferred embodiment of the present invention, Figure 6 is an exploded perspective view of Figure 5, Figure 7 is a side cross-sectional view of FIG.

5 to 7, the pulsation-free pulsation metering pump 100 using the constant velocity cam according to the present invention includes a driving motor 10 mounted on the housing 11 and a driving force of the driving motor 10. The worm wheel 20 and the worm wheel 21 engaged with the worm gear 20 are mounted to receive the worm wheel shaft 30 and the worm wheel shaft 30 is rotated by the transmission of the driving force of the drive motor 10 and the worm wheel shaft 30. Each end is formed as an oval cam shape and is rotated to have a phase difference of 180 ° between each other. When the oval shape is not formed as a target shape, it is mounted on the worm wheel shaft through rework compensation by operation of a compensator using a machining center. The first and second constant speed cams 40 and 50, the first and second constant speed cams 40 and 50 are rotated and pressurized by the operation of the first and second constant speed cams 40 and 50, Slider 80 is mounted to be slidable, the slider 80 is interlocked It includes a discharging unit 90 for discharging the suction body.

The drive motor 10 is mounted to the housing 11 to transfer the driving force. The driving force of the drive motor 10 is transmitted to the worm gear 20. Reference numeral 13 denotes an inverter and 14 denotes a bracket.

The worm gear 20 is rotated by receiving the driving force of the drive motor 10, the worm wheel shaft 30 is engaged.

The worm wheel shaft 30 is driven by being mounted with a worm wheel 21 engaged with the worm gear 20, the first / second constant speed cam 40, 50 is mounted at both ends thereof. The first and second constant speed cams 40 and 50 are mounted at both ends of the worm wheel shaft 20 and rotated to have a phase difference of 180 ° with each other. The mounting of the first and second constant speed cams 40 and 50 determines whether the oval shape is formed into a target shape, and if it is not formed into a target shape, three-dimensional machining such as a machining center or a wire cutter. The operation of the correction device 60 using the device to be mounted again through the rework correction.

The bearing 70 is rotationally pressurized by the operation of the first / second constant velocity cams 40 and 50.

The slider 80 is mounted to be slidable under pressure of the bearing 70.

In addition, the discharge means 90 is mounted to the slider 80 to be interlocked to operate to suck and discharge the fluid. The discharge means 90 may be configured of any one of a diaphragm, a plunger or a piston.

The correction device 60 receives a graph of a target pulsation waveform to obtain the discharge fluid, and receives a graph of the output pulsation waveform obtained through the operation of the first and second constant velocity cams 40 and 50. A correction unit 61 for correcting and programming the target pulsation waveform graph and the output pulsation waveform graph, and the first / second constant velocity cams 40 and 50 received from the correction data of the correction unit 61. It is provided with a three-dimensional processing apparatus 63 for reworking the oval shape of the. The correction unit 60 is preferably composed of a predetermined computer that can compare the graph data with each other. The three-dimensional processing apparatus 63 is preferably provided with a machining center or a wire cutter to correct the appearance of the first and second constant speed cams 40 and 50. That is, the correction unit 61 transmits correction data to the three-dimensional processing apparatus 63, and in such a transmission, the correction unit 61 is transmitted in a data state capable of driving the three-dimensional processing apparatus 63 such as a machining center or a wire cutter. .

That is, the correction unit 61 of the correction device 60 first receives the data value of the graph of the target pulsation waveform to be obtained. This target pulsation waveform refers to a graph in a state where the pulsation of the discharge flow rate of the constant velocity cam is reduced, and is input as an input value by direct preparation by an operator. The data of the graph of the output pulsation waveform output by the direct operation of the first / second constant speed cams 40 and 50 is input to the correcting unit 61. Accordingly, the correcting unit 61 is operated by an operator. The graph data value of the created target pulsation waveform is compared with the graph data value of the output pulsation waveform output by actual operation of the first / second constant velocity cams 40 and 50. When the graph data value of the target pulsation waveform and the graph data value of the output pulsation waveform are different from each other through the comparison of the correction unit 61, the graph of the output pulsation waveform is corrected to correspond to the graph of the target pulsation waveform. Then, the corrected output pulsation waveform graph is converted into data usable by the three-dimensional processing apparatus 63, and reprocessed to correct the appearance of the first and second constant speed cams 40 and 50 through the machining center. To be installed. The correction of this correction device 61 can be repeated until the discharge flow rate by the actual operation of the first / second constant velocity cams 40 and 50 obtains the desired pulsation waveform. That is, after the first / second constant velocity cams 40 and 50 are reworked to have a desired pulsation waveform, the first / second constant velocity input to the machining center is not performed by the machining center. Repetitive mass production is possible through the processing data of FIG. 40 and 50.

The output of the graph in the actual operation of the first / second constant speed cams 40 and 50 of the correction device 60 will be described in more detail. As shown in FIG. 8, the first / second constant velocity cams 40, 50 and the bearing 70 contact at the A position and B is the position of the first / second constant velocity cams 40, 50. It is a predetermined position of the outer peripheral surface, and C is a predetermined position of the bearing outer peripheral surface. The distance between the rotation center axis P of the first / second constant velocity cams 40 and 50 at this A position and the rotation center axis D of the bearing 70 is X = XC + XB. The B and C positions are X '= XC' + XB '. Here, the maximum value of X between -90 ° and 90 ° is based on the rotation center axis P of the first / second constant speed cam 40 and 50, and the first / second constant speed cam 40 and 50 ) And the bearing 70. Since the first and second constant velocity cams 40 and 50 and the bearing 70 can be represented by equations, X values can be found by sequentially substituting the Y axis values of the contact positions. The change of the X value for each rotation angle means the change of the flow velocity, so that the actual constant velocity graph can be drawn. It is possible to convert the values input to the machining center through the equation for each section through the implementation of the integration for each section of the graph.

FIG. 9 is a diagram showing a graph during actual operation of the first / second constant speed cams 40 and 50 described above. As shown in FIG. 9, the graph derived by the operation of the first / second constant speed cams 40 and 50 changes the values of d1, d2, d4, and d5 when the target pulsation waveform and the output pulsation waveform are different. To the optimum value. When this correction is completed, the complete data value is input to the machining center to correct the first / second constant velocity cams 40 and 50. By the correction by this correction apparatus 60, the precorrection graph shown in FIG. 10 is corrected by the after correction graph of FIG. As shown in Figs. 10 and 11, the pre-correction synthesized waveform 41 in Fig. 10 is corrected in a state where the pulsation is reduced to the synthesized waveform 43 after the correction in Fig. 11.

12 is a flowchart schematically showing a constant speed cam correction method of the present invention.

As shown in Fig. 12, the constant speed cam correction method of the present invention will be described.

First, a target pulsation graph is created. (S11) This target pulsation graph is prepared so as to correspond to the pulsation amount of the discharge fluid to be obtained of the metering pump. Such creation can be made by a worker. The preparation of such a target pulsation graph includes a step of preparing a target pulsation graph by an operator, and programming the data of the target pulsation graph of the above step into data input to the three-dimensional processing apparatus. Such programming can be derived with a sectionwise equation derived according to the sectionwise integration of the created target pulsation graph.

Next, the first and second constant speed cams are mounted on the worm wheel shaft 30 which is interlocked by the operation of the drive motor 10 of the metering pump and pressurizes the bearing 70 mounted to have a phase difference for pulsation reduction. 40 and 50 are manufactured. (S12) The production of the first and second constant speed cams 40 and 50 is provided as a test step product rather than a real product.

Subsequently, the output pulsation graph of the first / second constant velocity cams 40 and 50 in step S12 is output. (S13) The output of the first / second constant velocity cams 40 and 50 is output. As described above, the pulsation graph expresses a contact point between the first and second constant velocity cams 40 and 50 and the bearing 70 as a formula to determine the first and second constant velocity cams 40 and 50. Create an output pulsation graph.

Next, the target pulsation graph of step S11 and the output pulsation graph output from the first / second constant velocity cams 40 and 50 of step S13 are compared with each other (S14).

Subsequently, when the target pulsation graph of step S14 and the output pulsation graph output from the first / second constant velocity cams 40 and 50 are different, the first / second constant velocity cams 40 and 50 are different. Is corrected to the target pulsation graph value. (S15) If this correction is described in more detail, first, the output is output from the target pulsation graph and the first / second constant velocity cams 40 and 50. FIG. Measure the angle difference between the pulsating graphs. Then, a correction angle between the target pulsation graph of the step and the pulsation graph of the manufactured first / second constant speed cam is calculated. Next, to correct the program input to the three-dimensional processing device, such as a machining center or a wire cutter through the calculated angle of correction to correct the elliptical appearance of the first / second constant speed cam 40, 50 do. That is, as shown in Figure 9, the correction angle is to be corrected by changing the values of d1, d2, d4, d5.

The correction data of the corrected output pulsation graph is input to the three-dimensional processing apparatus (S16).

Subsequently, the elliptical shape of the first / second constant speed cams 40 and 50 is corrected by correcting the program input to the three-dimensional processing apparatus through the calculated angle of correction in step S15. As shown in FIG. 10 through the correction of the first and second constant velocity cams 40 and 50, the synthesized waveform before correction is a synthesized waveform in a state where pulsation is reduced, as shown in FIG. Calibration is possible.

The constant velocity cam correction method and the constant pulsation metering pump using the constant velocity cam according to the present invention have the following effects.

If the output pulsation waveform of the constant velocity cam is not the target pulsation waveform, the constant velocity cam is corrected by re-calibrating the constant velocity cam using the machining center, so that a pulsation-reduced quantitative pump can be realized.

In addition, the pulsation is reduced by the correction of the appearance of the constant velocity cam without the installation of an additional device in the metering pump for pulsation reduction, it is possible to maximize the pulsation reduction effect with a small production cost.

The present invention has been described above with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments falling within the scope equivalent to the present invention are possible by those skilled in the art. Therefore, the true scope of protection of the present invention should be defined by the following claims.

Claims (6)

A drive motor mounted to the housing; A worm gear that is operated by receiving a driving force of the driving motor; A worm wheel shaft mounted to the worm gear and rotatably operated by transmission of a driving force of the driving motor; Each end of the worm wheel shaft is formed in an elliptical cam shape and rotated to have a phase difference of 180 ° with each other. When the elliptical shape is not formed as a target shape, it is reworked by operation of a compensator using a three-dimensional processing device. A first / second constant speed cam mounted to the worm wheel shaft through the rim; A bearing pressurized by operation of the first / second constant velocity cam; A slider mounted to slide under pressure of the bearing; And Non-pulsation metering pump using the constant-speed cam, characterized in that it; The method of claim 1, The correction device, Receiving a graph of a target pulsation waveform to obtain the discharge fluid, receiving a graph of an output pulsation waveform obtained through operation of the first / second constant velocity cam, and receiving the target pulsation waveform graph and the output pulsation waveform graph A correction unit for correcting and programming if different; And And a three-dimensional processing apparatus for reprocessing the elliptical shape of the first and second constant speed cams by receiving the correction data of the correcting unit. The method of claim 2, The three-dimensional processing apparatus is a pulsation metering pump using a constant velocity cam, characterized in that the machining center. The method of claim 2, The three-dimensional processing apparatus is a pulsation metering pump using a constant velocity cam, characterized in that the wire cutting machine. (a) creating a target pulsation graph to correspond to the desired pulsation amount of the metering pump; (b) manufacturing a first / second constant speed cam mounted on a worm wheel shaft that is interlocked by operation of the drive motor of the metering pump and pressurizing a bearing mounted to have a phase difference for pulsation reduction; (c) outputting an output pulsation graph of the first / second constant velocity cam of step (b); (d) comparing the target pulsation graph of step (a) with the output pulsation graph output from the first / second constant velocity cam of step (c); (e) If the target pulsation graph of step (d) is different from the output pulsation graph output from the first / second constant velocity cam, the output pulse value of the first / second constant velocity cam is converted into the target pulsation. Correcting with a graph value; And (f) correcting and manufacturing the elliptical shape of the first / second constant speed cam by inputting the corrected graph value of the first / second constant speed cam of step (e) to a machining center; Equal speed cam correction method comprising a. The method of claim 5, In step (d), (d1) measuring an angular difference between the target pulsation graph and the pulsation graph output from the first / second constant velocity cam; (d2) calculating a correction angle between the target pulsation graph of step (d1) and the pulsation graph of the manufactured first / second constant velocity cam; And (d3) correcting the program input to the machining center through the calculated correction angle of step (d2) to correct the elliptical shape of the first / second constant speed cam; Fig. Cam correction method.

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