KR20210041701A - Dispenser for delivering micro-fixed quantity - Google Patents

Abstract

The present invention provides a dispenser for dispensing a micro-fixed quantity of liquid that is filled in a syringe by using a gas supplied from a compressed gas source. The dispenser for dispensing a micro-fixed quantity includes a first proportional control valve connected to a compressed gas source through a first pipe; a first solenoid valve having one side that is connected to the first proportional control valve through a second pipe, and an opposite side that is connected to a syringe through a third pipe, wherein the first solenoid valve determines whether the gas having a pressure adjusted through the first proportional control valve is supplied to the syringe; and a control unit for controlling operations of the first proportional control valve and the first solenoid valve. The dispenser for dispensing a micro-fixed quantity further includes a main air tank that has a predetermined surge capacity and is disposed on the first pipe, thereby supplying the gas stabilized and discharged through the main air tank to the first proportional control valve.

Description

Dispenser for fine quantitative dispensing {DISPENSER FOR DELIVERING MICRO-FIXED QUANTITY}

The present invention relates to a dispenser capable of discharging a more precise amount of fine quantity by enhancing the level of stabilization of a gas supply pressure required for discharging a liquid.

The pneumatic dispenser used in the manufacturing process of various electronic devices including semiconductors is an ultra-precision dispensing device that discharges a very small amount of liquid in a quantitative manner.

As the structure of the substrate, which is the object of discharging through such a dispenser, is gradually integrated and refined according to technological advances, the volume of liquid required for discharging is gradually becoming finer, and at the same time, a very small amount of liquid at a finer level is repeatedly performed. How accurately it can be delivered will determine the performance of the dispenser.

Accordingly, in recent years, a lot of research and technology development have been underway to enable precise control of fine quantitative discharge in response to the liquid discharge demand which has been further reduced to a very small amount.

Here, the precise control of the fine quantitative discharge performance of the dispenser is to minimize the pressure loss through stabilization of the compressible gas used as a pressure supply source for discharging the liquid in the syringe. It means that a close level can be applied to the discharge of the liquid.

Therefore, the fact that the level of the liquid discharge required amount is gradually miniaturized is that there is a considerable difficulty in controlling the quantitative discharge through the dispenser, and more advanced technology is required.

In this regard, as a prior document on the prior art prepared for precise control of the quantitative liquid discharge, there is a “liquid material discharging device” (hereinafter referred to as “prior art”) of Korean Laid-Open Patent Publication No. 10-2018-0034394.

However, in the case of conventional dispensers for quantitative dispensing including the prior art, the diameter or length of the piping structure, which is the movement path of the compressible gas used as a pressure supply source for discharging liquid, is adjusted, or separate An attempt was made to enable precise control of the quantitative discharge of liquid reduced to a very small amount by additionally installing an apparatus on the pipe or by installing a separate buffer member in consideration of the volume in the moving space of the compressible gas, but the level of precise control was insignificant.

In addition, in the case of conventional dispensers for quantitative dispensing including the prior art, the amount of liquid filled in the syringe gradually decreases due to the repetitive dispensing operation compared to the beginning of the discharging operation, resulting in a decrease in the precision control performance for fine dispensing There was a problem to become.

The present invention was created to solve the above problem, and an object of the present invention is to provide a technology that enables more precise control of fine quantitative discharge in response to the liquid discharge request amount reduced to a very small amount through a dispenser.

In addition, another object of the present invention is to significantly reduce the problem of deteriorating the level of the function of precisely controlling the fine-quantity discharge even if the amount of liquid filled in the syringe gradually decreases due to the repeated progress of the fine quantitative discharge through the dispenser. It is in providing technology.

In order to achieve the above object, the dispenser for discharging a fine quantitative quantity of the present invention is a dispenser for discharging a liquid filled in a syringe (Syringe) using a gas supplied from a compressed gas source, wherein the compressed gas source and the agent A first proportional control valve connected through one pipe; One side is connected through the first proportional control valve and a second pipe, and the other side is connected through the syringe and a third pipe, and supply of gas having a pressure adjusted through the first proportional control valve to the syringe A first solenoid valve to determine whether or not; And a control unit for controlling the operation of the first proportional control valve and the first solenoid valve, wherein the dispenser for fine quantitative discharge has a predetermined surge capacity and is a main air tank disposed on the first pipe. Including a further so that the gas stabilized and discharged through the main air tank is supplied to the first proportional control valve.

Here, the dispenser for discharging the fine quantitative quantity is disposed at one side between the main air tank and the compressed gas source on the first pipe, and includes a first auxiliary air tank having a smaller surge capacity than the main air tank; It is connected to one side between the main air tank and the first auxiliary air tank on the first pipe, and determines whether to supply the gas filled in the first auxiliary air tank through the compressed gas source to the main air tank And a fourth solenoid valve, wherein the controller may control an operation of the fourth solenoid valve.

In addition, the dispenser for fine quantitative discharge is connected to one side of a seventh pipe connecting one side between the main air tank and the first proportional control valve on the first pipe and one side of the third pipe, and the inside of the main air tank A pressure sensor for sensing a pressure according to the amount of gas charged, wherein the controller further comprises, when the pressure level inside the main air tank detected by the pressure sensor falls below a preset minimum reference value, the fourth solenoid valve By opening, it is possible to control so that the gas filled in the first auxiliary air tank can be supplied to the main air tank.

In addition, when the pressure level inside the main air tank detected by the pressure sensor rises above a preset maximum reference value, the control unit closes the fourth solenoid valve so that the gas filled in the first auxiliary air tank is converted into the main air. It can be controlled to cut off the supply to the tank.

In addition, when controlling liquid discharge through the syringe, the control unit opens the first solenoid valve while the fourth solenoid valve is closed to stabilize the gas filled in the main air tank and discharge, and then the first proportional control. It is possible to control so that the pressure adjusted through the valve is provided and transmitted to the syringe by passing through the second pipe and the third pipe.

In addition, the dispenser for discharging the fine quantitative quantity further comprises a second solenoid valve branched from the third pipe and connected to one side of the fourth pipe provided for rapid exhaust, and configured to determine whether to exhaust through the fourth pipe; and , The controller may control the operation of the second solenoid valve.

In addition, the dispenser for discharging the fine quantitative amount may include a second proportional control valve branched from the first pipe and connected to a vacuum ejector to be connected to one side of the fifth pipe provided for evacuating the vacuum; And connected to one side of the sixth pipe branching from the third pipe and connecting one side between the second proportional control valve and the vacuum ejector on the fifth pipe, and whether or not vacuum is maintained through the fifth pipe and the sixth pipe. A third solenoid valve for determining the; further comprising, the control unit may control the operation of the third solenoid valve,

In addition, the dispenser for fine quantitative discharge, is disposed on one side before the connection position of the second proportional control valve on the fifth pipe, a second auxiliary air tank having a smaller surge capacity than the main air tank; further includes can do.

According to the present invention, there are the following effects.

First, through the arrangement structure in which the main air tank is located in front of the first proportional control valve, it is possible to more precisely control the fine quantitative discharge by responding to the required amount of liquid discharge reduced to a very small amount.

Second, the gas required for the discharge operation is used in the main air tank, and the first auxiliary at the moment when the discharge operation is not performed, only when the amount of gas stored in the main air tank decreases below a certain level according to the repeated discharge operation. By allowing the pre-filled gas in the air tank to move into the main air tank and fill it, the level of the function to precisely control the fine-quantity discharge is lowered even though the amount of liquid filled in the syringe gradually decreases due to repeated micro-quantity discharge. The problem can be significantly reduced.

Third, through the arrangement structure in which the second auxiliary air tank is located in front of the second proportional control valve provided for vacuum exhaust, the gas used for vacuum exhaust is also moved to a more stabilized state, and the control of the vacuum maintenance state is also more precisely controlled. can do.

1 is a view showing a pipe and a valve connection structure of the dispenser for dispensing a fine quantitative amount of the present invention.
2 is a graph showing the results of a pressure increase test during liquid discharging performed on the dispenser for dispensing fine quantitative dispensing according to the first embodiment of the present invention.
3 is a graph showing a result of a pressure increase test when discharging a liquid performed on a dispenser for dispensing fine quantitative dispensing according to a second embodiment of the present invention.
4 is a graph showing a result of a pressure increase test when discharging a liquid performed on a dispenser according to a third embodiment of the related art.
5 is a graph showing the results of a pressure increase test when discharging a liquid performed on a dispenser according to a fourth embodiment of the related art.
6 is a graph summarizing the results of a pressure increase test when discharging a liquid performed on a dispenser according to the first to fourth embodiments.

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, but technical parts that are already well known will be omitted or compressed for conciseness of description.

1. Description of the components and structure of the dispenser for fine quantitative dispensing

Referring to Fig. 1, the dispenser 100 for discharging fine quantitative quantity of the present invention is for a plurality of buffers in order to discharge the liquid filled in the syringe (Syringe, S) using the gas supplied from the compressed gas source (A). Air tanks (110, 165, 170), a plurality of piping structures (120a to 120g), a plurality of proportional control valves (130, 160), a plurality of solenoid valves (140, 145, 150, 180) and a control unit 190 Includes.

First, the compressed gas source A is an external device connected to the dispenser 100 for fine quantitative discharge, and generates a compressible gas and supplies the gas to a pipe connected to the dispenser 100 for fine quantitative discharge.

The main air tank 110 is a buffer tank that has a predetermined surge capacity so that the gas generated from the compressed gas source (A) can be filled inside, and is controlled in a first proportion with the compressed gas source (A). It is disposed on the first pipe 120a connecting the valve 130.

Here, the surge capacity inside the main air tank 110 is preferably 600ml to 900ml (most preferably about 750ml), but is not limited thereto.

The first proportional control valve 130 is connected through a compressed gas source (A) and a first pipe (120a), stabilized and discharged through the main air tank 110, and discharged by controlling the moved gas to a preset pressure. It is a regulator to let you know.

Here, the first proportional control valve 130 is connected through the compressed gas source (A) and the first pipe (120a), stabilized through the main air tank 110, and controls the discharged and moved gas to reduce the pressure to reduce the set pressure. Customization is desirable.

The arrangement of the main air tank 110 and the first proportional control valve 130 based on the first pipe 120a is the order of the buffer tank-proportional control valve, unlike the conventional arrangement in the order of proportional control valve-buffer tank. This is because, rather than stabilizing the gas controlled by the set pressure through the buffer configuration, first stabilizing the gas and then controlling the gas at the set pressure shows excellent performance in precise control of the fine quantitative discharge.

One side of the first solenoid valve 140 is connected through a first proportional control valve 130 and a second pipe 120b, and the other side is connected through a syringe S and a third pipe 120c.

In other words, the first solenoid valve 140 is installed and connected to one side of a pipe comprising the second pipe 120b and the third pipe 120c connecting the first proportional control valve 130 and the syringe S. It controls the flow state of gas through.

Accordingly, the first solenoid valve 140 is a configuration of a valve that determines whether or not a gas having a pressure adjusted through the first proportional control valve 130 is supplied to the syringe S through opening and closing.

And, according to implementation, a first auxiliary air tank 170 and a fourth solenoid valve 180 may be additionally installed at one side between the main air tank 110 and the compressed gas source A on the first pipe 120a. have.

Here, the first auxiliary air tank 170 is disposed at one side between the main air tank 110 and the compressed gas source A on the first pipe 120a so that the amount of gas filled in the main air tank 110 is It is an auxiliary buffer to provide it when it falls below a certain level, and has a smaller surge capacity than the main air tank.

Specifically, the surge capacity inside the first auxiliary air tank 170 is preferably 80 ml to 100 ml (most preferably about 90 ml), but is not limited thereto.

Next, the fourth solenoid valve 180 is connected to one side between the main air tank 110 and the first auxiliary air tank 170 on the first pipe 120a, and is connected to the first pipe through the compressed gas source (A). This is a configuration of a valve that determines whether the gas filled in the auxiliary air tank 170 is supplied to the main air tank 110.

The main air tank 110 through the first auxiliary air tank 170 and the fourth solenoid valve 180 is not continuously supplied as gas through the compressed gas source (A) when performing the fine quantitative discharge operation. During the existing discharge operation, the problem of the method of continuously receiving gas from the compressed gas source (A) in order to refill the amount of gas discharged through the discharge operation is blocked in advance.

In the conventional case, even while the discharge operation is in progress, the gas supplied from the compressed gas source (A) and passed through the proportional control valve continues to fill the interior of the buffer structure such as the air tank, thereby stabilizing the gas discharged from the air tank. As a result, the pulsation is increased further, and as a result, an unstable state is caused, and if the pressure rise curve that analyzed the state of the supply gas pressure over time was checked, there was a problem that the overshoot was severe.

In contrast, the dispenser 100 for fine quantitative dispensing of the present invention not only differs in the arrangement of the main air tank 110 and the first proportional control valve 130, but furthermore, the main air tank 110 and the compression The first auxiliary air tank 170 and the fourth solenoid valve 180 are additionally installed between the gas sources (A), and when performing the fine quantitative discharge operation, the fourth solenoid valve 180 is closed to the compressed gas source (A). The gas supplied from is only filled in the first auxiliary air tank 170 and does not affect the main air tank 110.

Accordingly, the fourth solenoid valve 180, when the gas filled in the main air tank 110 falls below a certain level according to the repetitive discharge operation, during the remaining waiting time excluding the discharge operation and the vacuum state maintenance operation to be described later. The gas can be supplied to the main air tank 110 from the first auxiliary air tank 170 that has been opened and filled in advance.

To this end, the dispenser 100 for fine quantitative discharge of the present invention has one side between the main air tank 110 and the first proportional control valve 130 on the first pipe 120a and one side of the third pipe 120c (most preferred The gas filled in the main air tank 110 is connected to one side of the seventh pipe (120g) connecting the third pipe (120c), after the branch point of the fourth pipe (120d) and the sixth pipe (120f). It further includes a pressure sensor 115 for sensing the pressure according to the amount.

Here, the gas pressure value sensed through the pressure sensor 115 is transmitted to the control unit 190 to be described later, and the control unit 190 determines the amount of gas filled in the main air tank 110 based on this. Gas from the first auxiliary air tank 170 that was previously filled through the opening control for a certain time of the remaining waiting time except for the discharge operation of the solenoid valve 180 and the vacuum state maintenance operation to be described later, the main air tank 110 It controls whether or not to perform the work supplied to it.

Specifically, when the pressure level inside the main air tank 110 (the amount of gas filled) detected through the pressure sensor 115 falls below a preset minimum reference value, the fourth solenoid valve 180 Is controlled so that the gas filled in the first auxiliary air tank 170 can be supplied to the main air tank 110.

In addition, by opening the fourth solenoid valve 180, the gas filled in the first auxiliary air tank 170 continues to be supplied to the main air tank 110 and is detected through the pressure sensor 115. When the internal pressure level of the main air tank 110 (the amount of gas charged) rises above the preset maximum reference value, the control unit 190 closes the fourth solenoid valve 180 to fill the inside of the first auxiliary air tank 170 Controls to block the supply of the gas to the main air tank 110, and closes the fourth solenoid valve 180 during the micro-quantitative discharge operation and the vacuum state maintenance operation to be described later to be applied to the main air tank 110. Make sure that the gas stability is not affected by the incoming gas.

Therefore, when controlling the liquid discharge through the syringe (S), the controller 190 opens the first solenoid valve 140 with the fourth solenoid valve 180 closed to stabilize the gas filled in the main air tank 110. After being discharged, the pressure is adjusted to a preset pressure through the first proportional control valve 130 and moved through the second pipe 120b and the third pipe 120c. As a result, the liquid is delivered to the syringe S so that the liquid is discharged. Control is performed to make it happen.

The second solenoid valve 145 is a configuration of a valve that is branched from the third pipe 120c and connected to one side of the fourth pipe 120d provided for rapid exhaust, and determines whether to exhaust through the fourth pipe 120d. .

Here, the fourth pipe 120d passes through the first proportional control valve 130 using the gas filled in the main air tank 110 described above, and then the second pipe ( After the gas that has undergone adjustment and stabilization of the set pressure that moves the pipe consisting of 120b) and the third pipe 120c performs a task on discharging the liquid filled in the syringe S, the control unit 190 2 This is a pipe for instantaneously performing rapid exhaust through the instantaneous opening of the solenoid valve 145.

Therefore, the control unit 190 immediately opens the second solenoid valve 145 and closes the second solenoid valve 145 immediately after the operation for discharging the liquid filled in the syringe S is performed, through the fourth pipe 120d. Perform rapid exhaust.

The second proportional control valve 160 is a regulator connected to one side of the fifth pipe 120e provided for vacuum exhaust by branching from the first pipe 120a and connected to a vacuum ejector (not shown).

Through this, the second proportional control valve 160 indicates a branch point at which the gas supplied to the first pipe 120a through the compressed gas source A is connected to the first pipe 120a and the fifth pipe 120e. The gas, which has been branched to the fifth pipe 120e, is controlled and discharged at a preset pressure.

Through this, the gas evacuated to the vacuum ejector (not shown) through the second proportional control valve 160 on the fifth pipe 120e has a preset pressure.

Furthermore, one side before the connection position of the second proportional control valve 160 on the fifth pipe 120e (the second proportional control valve 160 on the fifth pipe 120e) and the first pipe 120a and the fifth pipe A second auxiliary air tank 165 having a smaller surge capacity than the main air tank 110 may be installed at one side between the branch points where the connection of (120e) is made.

In this case, the gas branched from the first pipe (120a) and moved to the fifth pipe (120e) with the compressed gas source (A) as a source passes through the second auxiliary air tank (165), and then first undergoes stabilization of the gas. , It passes through the second proportional control valve 160 and undergoes a process of adjusting to the set pressure.

Through this, the gas moved along the fifth pipe 120e for evacuation and evacuated by the vacuum ejector is maintained in a more stabilized state.

The third solenoid valve 150 is branched from the third pipe 120c and connected to one side of the sixth pipe 120f connecting one side between the second proportional control valve 160 on the fifth pipe 120e and the vacuum ejector. , It is a configuration of a valve that determines whether to maintain a vacuum through the fifth pipe 120e and the sixth pipe 120f.

Therefore, the control unit 190 maintains the vacuum state after the fine quantitative discharge operation so that the liquid inside the syringe S does not cause problems such as suction, spillage, or leakage, and the state can be maintained until the next fine quantitative discharge operation. The third solenoid valve 150 is opened so that it can be connected to the vacuum exhaust through a vacuum ejector connected to the outside.

In addition, the control unit 190 closes the third solenoid valve 150 when the fine quantitative discharge operation is in progress, so that the operation for maintaining the vacuum state through vacuum exhaust is terminated.

In this way, the time when the control unit 190 opens the third solenoid valve 150 to perform the vacuum state maintenance operation using vacuum exhaust is preferably rapid through the instantaneous opening of the second solenoid valve 145 after the fine quantitative discharge operation. It proceeds immediately after performing the exhaust operation.

The control unit 190 includes a first proportional control valve 130, a second proportional control valve 160, a first solenoid valve 140, and a second solenoid for performing a fine quantitative discharge operation, a rapid exhaust operation, or a vacuum state maintenance operation. The operation of the valve 145, the third solenoid valve 150, and the fourth solenoid valve 180 is controlled.

For example, the control unit 190 may adjust the level of the set pressure to be adjusted through the first proportional control valve 130 and the second proportional control valve 160, or the first solenoid valve 140 and the second solenoid The valve 145, the third solenoid valve 150, and the fourth solenoid valve 180 may be controlled in a manner of adjusting the open/close state or degree of opening, but the present invention is not limited thereto.

In addition, the control unit 190 determines the internal pressure level or gas filling state of the main air tank 110 based on the received sensor value detected through signal communication with the pressure sensor 115 as described above. It can perform various functions up to functions.

2. Description of the supply pressure stabilization test of the dispenser for fine quantitative dispensing

The dispenser 100 for fine quantitative discharge according to the present invention has a detailed structure differentiated from the prior art so as to provide the above-described constitutive features and effects.

Stabilization of gas supply pressure due to the arrangement of the additional components of the present invention and the differentiation of arrangements between components, and advancement of the precision control performance of the fine quantitative discharge function through this It will be demonstrated through the supply stabilization test results for each example (X axis: time unit ms, Y axis: pressure unit mPA).

First, in the first embodiment, the dispenser 100 for fine quantitative discharge according to the present invention comprises a main air tank 110, a first auxiliary air tank 170, a second auxiliary air tank 165, and the first piping to the seventh. Pipes 120a to 120g, first proportional control valve 130, It includes a first solenoid valve 140, a second solenoid valve 145, a third solenoid valve 150, a second proportional control valve 160, a fourth solenoid valve 180, and a control unit 190, respectively. The characteristics of each configuration are as described above.

Therefore, in the first embodiment, as well as the configuration of the buffer such as the main air tank 110, the first auxiliary air tank 170, and the second auxiliary air tank 165 are provided, the installation form of the main air tank 110 is It is located at the front end of the first proportional control valve 130, and at one side of the first pipe 120a between the main air tank 110 and the compressed gas source A, the first auxiliary air tank 170 and the fourth solenoid valve (180) is installed.

In addition, Example 1 is used for discharging the liquid in the syringe (S) preferentially using only the gas filled in the main air tank 110 by closing the fourth solenoid valve 180 when performing the fine quantitative discharge operation, When the amount of gas filled in the main air tank 110 decreases to a certain level, the fourth solenoid valve 180 is opened and the gas in the first auxiliary air tank 170 previously filled through the compressed gas source (A) is The main air tank 110 can be filled to a certain level.

As a result of performing a gas supply pressure stabilization test, which measures the change over time of the gas supply pressure generated when performing the fine quantitative discharge operation of the fine quantitative discharge dispenser 100 of the present invention according to Example 1, FIG. 2 As shown in Fig. 1, a pressure rise curve that graphed the pressure change over time was derived.

Next, in the second embodiment, the dispenser 100 for fine quantitative discharge according to the present invention includes the main air tank 110, the first to seventh pipes 120a to 120g, the first proportional control valve 130, and the first 1 solenoid valve 140, the second solenoid valve 145, the third solenoid valve 150, the second proportional control valve 160, including the control unit 190, the characteristics of each configuration as described above. State.

Therefore, Example 2 is the configuration of the first auxiliary air tank 170 and the fourth solenoid valve 180 installed in front of the main air tank 110 in the detailed configuration of the dispenser 100 for discharging fine quantity according to the first embodiment. This is excluded, and furthermore, the configuration of the second auxiliary air tank 165 installed in front of the second proportional control valve 160 is also excluded.

As a result of performing a gas supply pressure stabilization test for measuring the change over time of the gas supply pressure generated when performing the fine quantitative dispensing operation of the fine quantitative dispensing dispenser 100 of the present invention according to Example 2, FIG. 3 As shown in Fig. 1, a pressure rise curve that graphed the pressure change over time was derived.

Next, in the third embodiment, the detailed configuration of the dispenser 100 for fine quantitative dispensing according to the first embodiment is provided in the same manner, but the front end of the first proportional control valve 130 is the installation location of the main air tank 110 It is in a state that is changed between the first proportional control valve 130 and the first solenoid valve 140.

As a result of performing the gas supply pressure stabilization test, which measures the change over time of the gas supply pressure generated when performing the fine quantitative dispensing operation of the quantitative dispensing dispenser according to Example 3, as shown in FIG. A pressure rise curve that graphed the pressure change was derived.

Next, in the fourth embodiment, the detailed configuration of the dispenser 100 for fine quantitative dispensing according to the second embodiment is provided in the same manner, but the front end of the first proportional control valve 130 is the installation location of the main air tank 110 It is in a state that is changed between the first proportional control valve 130 and the first solenoid valve 140.

As a result of performing the gas supply pressure stabilization test, which measures the change over time of the gas supply pressure generated when performing the fine quantitative dispensing operation of the quantitative dispensing dispenser according to Example 4, as shown in FIG. A pressure rise curve that graphed the pressure change was derived.

As a result, in order to integrate and compare the shape of the pressure rise curve showing the change in pressure according to the time change resulting from the stabilization test of the gas supply pressure for each dispenser ranging from Examples 1 to 4, as shown in FIG. A comprehensive graph was created.

Accordingly, looking at the result graph of the gas supply pressure stabilization test showing the pressure rise curve for each example in FIGS. 2 to 5 and the result graph of the gas supply pressure stabilization test showing the pressure rise curve for each example in FIG. It can be seen that the results of Examples 1 and 2 are much more stable and improved than those of Examples 3 and 4, and the degree of overshoot on the graph curve is also much smaller.

Through this, the characteristic of the arrangement structure in which the main air tank 110 is located in front of the first proportional control valve 130 is more suitable to control the fine quantitative discharge more precisely as it responds to the liquid discharge demand reduced to a very small amount. Can be seen.

That is, when the compressible gas supplied to the first proportional control valve 130 is preferentially stabilized through the main air tank 110, it is controlled to a set pressure through the first proportional control valve 130 and discharged. It indicates that it will play a very large role in the stabilization of

In addition, when comparing the results of Example 1 and Example 2, Example 1 was more stable and improved than Example 2, as well as the degree of overshoot on the graph curve. It can be seen that there is little.

Although this does not seem to be a big difference on the graph, the level of high-precision control through the dispenser 100 for fine quantitative dispensing considering the situation that the amount of liquid required for quantitative dispensing is gradually miniaturized, and more precise technology is required to control it. Can have a great effect on

In addition, in performing the gas supply pressure stabilization test of Examples 1 to 4, when the test is performed using a compressor having a more fluctuating gas pressure than the air supply source (A) used, Example 1 and Not only does the pressure rise curve between Example 2 show a large difference, but also the difference between Examples 1 and 2 and Examples 3 and 4 is also more significant.

Therefore, most preferably, the gas required for the fine quantitative discharge operation is used in the main air tank 110, and only when the amount of gas stored in the main air tank 110 decreases below a certain level according to the repeated discharge operation. When the discharge operation or the vacuum state maintenance operation is not performed, the fourth solenoid valve 180 is opened so that the gas pre-filled in the first auxiliary air tank 170 moves into the main air tank 110 and is filled. It can be a major feature.

The embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: dispenser for dispensing fine quantity
110: main air tank 115: pressure sensor
120a: first pipe 120b: second pipe
120c: 3rd pipe 120d: 4th pipe
120e: 5th pipe 120f: 6th pipe
120g: 7th pipe
130: first proportional control valve 140: first solenoid valve
145: second solenoid valve 150: 3rd solenoid valve
160: second proportional control valve 165: second auxiliary air tank
170: first auxiliary air tank 180: fourth solenoid valve
190: control unit
A: Compressed gas source
S: syringe

Claims (8)

In the dispenser for dispensing a fine quantitative quantity to discharge a liquid filled in a syringe (Syringe) using a gas supplied from a compressed gas source,
A first proportional control valve connected to the compressed gas source through a first pipe;
One side is connected through the first proportional control valve and a second pipe, and the other side is connected through the syringe and a third pipe, and supply of gas having a pressure adjusted through the first proportional control valve to the syringe A first solenoid valve to determine whether or not; And
Includes; a controller for controlling the operation of the first proportional control valve and the first solenoid valve
The dispenser for fine quantitative discharge further includes a main air tank disposed on the first pipe with a predetermined surge capacity, so that the gas stabilized and discharged through the main air tank to the first proportional control valve Characterized in that to be supplied
Dispenser for fine quantity dispensing.
The method of claim 1,
The dispenser for dispensing the fine quantitative quantity,
A first auxiliary air tank disposed on one side between the main air tank and the compressed gas source on the first pipe and having a smaller surge capacity than the main air tank;
It is connected to one side between the main air tank and the first auxiliary air tank on the first pipe, and determines whether to supply the gas filled in the first auxiliary air tank through the compressed gas source to the main air tank The fourth solenoid valve further includes,
Wherein the control unit controls the operation of the fourth solenoid valve
Dispenser for fine quantity dispensing.
The method of claim 2,
The dispenser for dispensing the fine quantitative quantity,
It is connected to one side of the seventh pipe connecting one side between the main air tank and the first proportional control valve on the first pipe and one side of the third pipe to sense a pressure according to the amount of gas filled in the main air tank. It further includes a pressure sensor;
When the internal pressure level of the main air tank detected by the pressure sensor falls below a preset minimum reference value, the controller opens the fourth solenoid valve so that the gas filled in the first auxiliary air tank is converted into the main air Characterized in that it is controlled so that it can be supplied to the tank
Dispenser for fine quantity dispensing.
The method of claim 3,
When the pressure level inside the main air tank detected by the pressure sensor rises above a preset maximum reference value, the control unit closes the fourth solenoid valve so that the gas filled in the first auxiliary air tank is transferred to the main air tank. Characterized in that it controls so as to cut off the supply
Dispenser for fine quantity dispensing.
The method of claim 4,
When controlling liquid discharge through the syringe, the control unit opens the first solenoid valve while the fourth solenoid valve is closed to stabilize the gas filled in the main air tank and discharges the liquid, and then opens the first proportional control valve. It characterized in that the control so as to be delivered to the syringe by passing through the second pipe and the third pipe by equipping the pressure adjusted through
Dispenser for fine quantity dispensing.
The method of claim 1,
The dispenser for dispensing the fine quantitative quantity,
A second solenoid valve branched from the third pipe and connected to one side of the fourth pipe provided for rapid exhaust, and configured to determine whether to exhaust through the fourth pipe; and
Wherein the control unit controls the operation of the second solenoid valve
Dispenser for fine quantity dispensing.
The method of claim 1,
The dispenser for dispensing the fine quantitative quantity,
A second proportional control valve branched from the first pipe and connected to a vacuum ejector to be connected to one side of the fifth pipe provided for evacuating the vacuum; And
It is branched from the third pipe and connected to one side of the sixth pipe connecting one side between the second proportional control valve and the vacuum ejector on the fifth pipe, and whether or not vacuum is maintained through the fifth pipe and the sixth pipe The third solenoid valve to determine; further includes,
The control unit is characterized in that to control the operation of the third solenoid valve
Dispenser for fine quantity dispensing.
The method of claim 7,
The dispenser for dispensing the fine quantitative quantity,
And a second auxiliary air tank disposed on one side of the fifth pipe before the connection position of the second proportional control valve and having a smaller surge capacity than the main air tank.
Dispenser for fine quantity dispensing.

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