JP2009154064A - Droplet dispenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus capable of always ejecting droplets of a certain size in a droplet application dispenser that ejects droplets by reciprocating movement of a plunger.
A dispenser main body having a hollow portion, a nozzle provided in the dispenser main body, a liquid material supply path for supplying a liquid material into the nozzle, and a piston accommodated and arranged in a movable state in the hollow portion. A plunger provided in the piston that extends and is disposed in the nozzle and opens and closes the liquid material outlet of the nozzle; an elastic means that is accommodated and disposed in the hollow portion and biases the piston and the plunger in one direction; and a working fluid in the hollow portion Fluid supply / discharge means for selectively moving the piston and plunger against the urging force of the elastic means in the other direction, and the liquid material outlet is closed by the plunger inserted in the liquid material supply path. And a check valve for preventing back flow of the liquid material when being used.
[Selection] Figure 1

Description

  The present invention relates to a droplet application dispenser, and in particular, a check valve for restricting the backflow (return) of a liquid material is provided in a liquid material supply path, thereby keeping the size of a discharged droplet constant at all times. It relates to things devised so that

  A conventional droplet application dispenser has a configuration as shown in FIGS. 3 and 4, for example. First, there is a dispenser main body 101. The dispenser main body 101 includes a hollow cylindrical body 101a, and an upper end plug 101b and a lower end plug 101c fixed to the upper and lower sides of the hollow cylindrical body 101a. A hollow portion 103 is formed in the dispenser body 101. The upper end plug 101b and the lower end plug 101c of the dispenser main body 101 have through holes 102a and 102b, respectively. Further, an air supply port 114 connected to the hollow portion 103 is perforated at a lower portion of the side surface of the dispenser main body 101. In addition, a liquid material supply port 118 connected to the through hole 102 is formed in the lower end plug 101c of the dispenser body 1 in the horizontal direction. A packing 108 is installed at the connecting portion between the through hole 102 and the hollow portion 103.

A nozzle 111 is connected to the lower end plug 101 c of the dispenser body 101. The nozzle 111 is connected so that the hollow portion 106 of the nozzle 111 and the hollow portion 103 of the dispenser body 101 communicate with each other through the hole 102. The nozzle 111 is formed with a liquid material outlet 120. A piston 105 is accommodated and arranged in the hollow portion 103 of the dispenser main body 101. A plunger 107 is integrally provided on the bottom surface side of the piston 105. A shaft 104 is integrally provided on the upper surface side of the piston 105.
The plunger 107 and the shaft 104 may be provided separately and connected to the piston 105.

The plunger 107 is extended and arranged so as to reach the inside of the nozzle 111 while passing through the packing 108 and the through hole 102. A support body 116 is installed on the upper surface of the piston 105, and a support body 116 is also installed inside the upper end plug 101b already described. A coil spring 109 is installed between the two supports 116. The shaft 104 is disposed at the center of the coil spring 109. The hollow portion 103 is partitioned by the piston 105 into a spring chamber 103a and an air chamber 103b.

An adjustment knob 110 is screwed and joined to the upper end plug 101b of the dispenser body 101. The shaft portion 110 a of the adjustment knob 110 is a male screw portion and is screwed to the upper end plug 101 b of the main body 1. And it is comprised so that the stroke of the said piston 105 can be adjusted by adjusting the screwing amount. An air supply pipe 113 is connected to the air supply port 114, and the air supply pipe 113 is connected to an air supply device 117. An electromagnetic switching valve 115 is inserted in the air supply pipe 113. A liquid material supply device 121 is connected to the liquid material supply port 118 via a liquid material supply pipe 119.

The electromagnetic switching valve 115 includes an air supply side switching position 115a and an atmosphere release side switching position 115b, and is configured to be switched appropriately based on an electric signal input separately. That is, the solenoid 115d is excited by the input of the electric signal, and thereby, the solenoid 115d is switched to the air supply side switching position 115a against the urging force of the coil spring 115c. On the other hand, when the excitation of the solenoid 115d is released, it is switched to the atmospheric release side switching position 115b by the spring force of the coil spring 115c.

The operation will be described based on the above configuration.
First, the liquid material is supplied from the liquid material supply device 121 to the hollow portion 106 in the nozzle 111 through the liquid material supply pipe 119 under a certain pressure. At this time, the electromagnetic switching valve 115 is switched to the air supply side switching position 115a, and the air chamber 103b and the air supply source 117 are in communication with each other. Then, air flows into the air chamber 103b, and the piston 105 is pushed upward by the air pressure. At the same time, since the plunger 107 connected to the piston 105 is also moved upward, the liquid material outlet 120 of the nozzle 111 is opened, and the liquid material flows out from the tip of the nozzle 111. This is shown in FIG.

Next, the electromagnetic switching valve 15 is switched to the atmosphere release side switching position 115b side. And it will be in the state which connects the air chamber 103b and air | atmosphere. Thereby, the air in the air chamber 103b flows out into the atmosphere, and the air pressure in the air chamber 103b decreases. As a result, the piston 105 pushed upward is pushed down by the repulsive force of the coil spring 109. In conjunction with this, the plunger 107 also moves downward, and the liquid material outlet 120 of the nozzle 111 is closed by the tip of the plunger 107. The liquid material is pushed out from the nozzle 111 by the downward movement of the plunger 107. Further, the liquid material outlet 120 is completely closed by the plunger 107, whereby the outflow of the liquid material to the outside is stopped. This is shown in FIG.
By repeating the above two states alternately at high speed, droplets are ejected from the nozzle 11.

For example, Patent Literature 1, Patent Literature 2, Patent Literature 3, Patent Literature 4, Patent Literature 5 and the like disclose configurations of the same kind of droplet application dispenser.
Japanese Patent Laid-Open No. 11-197571 JP 2002-282740 A Japanese Patent No. 3506716 Japanese Patent No. 3762384 Japanese Patent No. 3616105

The conventional configuration has the following problems.
When closing the liquid material outlet 120 of the inner nozzle 111 in the reciprocating movement of the plunger 107, the plunger 107 pushes out the liquid material. At this time, a part of the liquid material flows backward to the supply device 121 side. May end up. Therefore, a constant amount of liquid material is not always discharged, and there is a problem that the discharge amount of each droplet is not constant.

The present invention has been made based on such points, and the object is to prevent a part of the liquid material from flowing backward to the liquid material supply device side when the plunger closes the valve seat, and is always constant. An object of the present invention is to provide a droplet application dispenser capable of ejecting an amount of droplets.

In order to achieve the above object, a droplet application dispenser according to claim 1 of the present invention includes a dispenser body having a hollow portion, a nozzle provided integrally or separately in the dispenser body, and a liquid material supply in the nozzle. A liquid material supply path for supplying a liquid material from the apparatus, a piston accommodated and disposed in a state of being movable in the hollow portion, and an integral or separate body provided on the piston and extended and disposed in the nozzle. A plunger that opens and closes a liquid material outlet provided in the nozzle; an elastic means that is accommodated and arranged in the hollow portion and biases the piston and the plunger in one direction; and a working fluid that is connected to the hollow portion and is placed in the hollow portion. Working fluid supply / discharge means for selectively moving the piston and plunger in the other direction against the urging force of the elastic means by supplying / discharging; It is characterized in that anda check valve for preventing backflow of the liquid material when the liquid material outlet port is closed by the plunger inserted in the liquid material supply passage.
According to a second aspect of the present invention, there is provided the liquid droplet application dispenser according to the first aspect, wherein the liquid material supply path is a liquid material supply pipe disposed between the liquid material supply device and the dispenser body. The check valve is interposed in the liquid material supply pipe.
A droplet application dispenser according to claim 3 is the droplet application dispenser according to claim 1 or 2, wherein the check valve is a ball type check valve.

As described above, the droplet application dispenser according to the first aspect of the present invention includes a dispenser main body having a hollow portion, a nozzle provided integrally or separately in the dispenser main body, and a liquid material supply device in the nozzle. A liquid material supply path for supplying the liquid material from the liquid, a piston accommodated and arranged in a movable state in the hollow portion, and a nozzle provided integrally with the piston or separately and extended and arranged in the nozzle A plunger that opens and closes the liquid material outlet provided in the housing, elastic means that is accommodated and arranged in the hollow portion and biases the piston and plunger in one direction, and is connected to the hollow portion to supply a working fluid into the hollow portion. A working fluid supply / discharge means for selectively moving the piston and plunger in the other direction against the urging force of the elastic means by discharging; And a check valve that prevents back flow of the liquid material when the liquid material outlet is closed by the plunger and is inserted into the liquid material supply path. When moving the liquid material outlet in the closing direction, the liquid material is pushed by the plunger and tries to flow back to the liquid material supply device side, but this can be reliably prevented by the check valve, The size of the ejected droplets can always be kept constant. In addition, since it has a very simple configuration in which a check valve is inserted, for example, it can be easily applied to an existing apparatus.
According to a second aspect of the present invention, there is provided the liquid droplet application dispenser according to the first aspect, wherein the liquid material supply path is a liquid material supply pipe disposed between the liquid material supply device and the dispenser body. In addition, since the check valve is inserted into the liquid material supply pipe, a desired effect can be easily obtained with a very simple configuration.
In addition, the droplet application dispenser according to claim 3 is the droplet application dispenser according to claim 1 or 2, wherein the check valve is a ball type check valve, so that the above effect can be obtained with a very simple configuration. It is something that can be done.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The droplet application dispenser according to the present embodiment is configured as shown in FIGS. First, there is a dispenser main body 1. The dispenser main body 1 is composed of a hollow cylindrical body 1a, and an upper end plug 1b and a lower end plug 1c fixed to the upper and lower sides of the hollow cylindrical body 1a. A hollow portion 3 is formed in the dispenser body 1. Further, the upper end plug 1b and the lower end plug 1c of the dispenser body 1 are provided with through holes 2a and 2b, respectively. Further, an air supply port 14 connected to the hollow portion 3 is perforated at a lower portion of the side surface of the dispenser body 1. Further, a liquid material supply port 18 connected to the through hole 2 is formed in the horizontal direction in the lower end plug 1 c of the dispenser body 1. A packing 8 is installed at the connecting portion between the through hole 2 and the hollow portion 3.

A nozzle 11 is connected to the lower end plug 1 c of the dispenser body 1. The nozzle 11 is connected so that the hollow portion 6 of the nozzle 11 and the hollow portion 3 of the dispenser body 1 communicate with each other through the hole 2. The nozzle 11 is formed with a liquid material outlet 20. A piston 5 is accommodated and disposed in the hollow portion 3 of the dispenser body 1. A plunger 7 is integrally provided on the bottom surface side of the piston 5. A shaft 4 is integrally provided on the upper surface side of the piston 5.
The plunger 7 and the shaft 4 may be provided separately and connected to the piston 5.

The plunger 7 is extended and arranged so as to reach the inside of the nozzle 11 while passing through the packing 8 and the through hole 2. The support body 16 is installed on the upper surface of the piston 5 and the support body 16 is also installed inside the upper end plug 1b described above. A coil spring 9 is installed between these supports 16 and 16. The shaft 4 is disposed at the center of the coil spring 9. The hollow portion 3 is partitioned by the piston 5 into a spring chamber 3a and an air chamber 3b.

An adjustment knob member 10 is screwed and joined to the upper end plug 1b of the dispenser body 1. The shaft portion 10 a of the adjustment knob member 10 is a male screw portion and is screwed into the upper end plug 1 b of the dispenser body 1. And it is comprised so that the stroke of the said piston 5 can be adjusted by adjusting the screwing amount. An air supply pipe 13 is connected to the air supply port 14, and the air supply pipe 13 is connected to an air supply device 17. An electromagnetic switching valve 15 is inserted in the air supply pipe 13. A liquid material supply device 21 is connected to the liquid material supply port 18 via a liquid material supply pipe 19.

The electromagnetic switching valve 15 is provided with an air supply side switching position 15a and an atmosphere release side switching position 15b, and can be appropriately switched based on an electric signal inputted separately. That is, the solenoid 15d is excited by the input of the electric signal, and thereby, the solenoid 15d is switched to the air supply side switching position 15a against the urging force of the coil spring 15c. On the other hand, when the excitation of the solenoid 15d is released, the solenoid spring 15c is switched to the atmospheric release side switching position 15b by the spring force of the coil spring 15c.

A check valve 23 is inserted in the liquid material supply pipe 19. The check valve 23 is a ball type. By inserting such a check valve 23, when the plunger 7 moves downward, the liquid material present in the hollow portion 6 in the nozzle 11 is pushed by the plunger 7 toward the material supply device 21. It is intended to prevent backflow.

The operation will be described based on the above configuration.
First, the liquid material is supplied from the liquid material supply device 21 through the liquid material supply pipe 19 to the hollow portion 6 in the nozzle 11 under a constant pressure. At this time, the electromagnetic switching valve 15 is switched to the air supply side switching position 15a side, and the air chamber 3b and the air supply source 17 are in communication with each other. Then, air flows into the air chamber 3b, and the piston 5 is pushed upward by the air pressure. At the same time, since the plunger 7 connected to the piston 5 is also moved upward, the liquid material outlet 20 of the nozzle 11 is opened, and the liquid material flows out from the tip of the nozzle 11. This is shown in FIG.

Next, the electromagnetic switching valve 15 is switched to the atmosphere release side switching position 15b side. And it will be in the state which connects the air chamber 3b and air | atmosphere. If it does so, the air in the air chamber 3b will flow out into air | atmosphere, and the air pressure in the air chamber 3b will fall. As a result, the piston 5 pushed upward is pushed down by the repulsive force of the coil spring 9. In conjunction with this, the plunger 7 also moves downward, and the liquid material outlet 20 of the nozzle 11 is closed by the tip of the plunger 7. The liquid material is pushed out from the nozzle 11 by the downward movement of the plunger 7. Further, the liquid material outlet 20 is completely closed by the plunger 7, whereby the outflow of the liquid material to the outside is stopped. This is shown in FIG.

In the above series of operations, when the plunger 7 moves downward, the liquid material present in the hollow portion 6 in the nozzle 11 is pushed by the plunger 7 and tends to flow back to the material supply device 21 side. However, the back flow of the liquid material is surely prevented by the check valve 23.

As described above, according to the present embodiment, the following effects can be obtained.
That is, when the plunger 7 moves downward in a series of operations, the liquid material existing in the hollow portion 6 in the nozzle 11 is pushed by the plunger 7 and tries to flow back to the material supply device 21 side. Is reliably prevented by the check valve 23. Therefore, the size of the droplets discharged from the nozzle 11 can be kept constant at all times.
In addition, since the check valve 23 is inserted into the liquid supply pipe 19, it is possible to easily cope with, for example, an existing apparatus.

The present invention is not limited to the one embodiment.
1 and 2, the check valve 23 installed in the liquid material supply pipe 19 is a ball check valve, but is not limited to this.
Moreover, although the switching valve installed in the air supply pipe 13 is an electromagnetic switching valve, it is not limited to this.
The elastic means for pushing back the piston 5 is the coil spring 9, but the invention is not limited to this.
In addition, the structure of each part shown in figure is an example to the last, and various deformation | transformation can be considered.

  The present invention relates to a droplet application dispenser, and in particular, a check valve for restricting the return of a liquid material is provided in a liquid material supply path so that the size of a discharged droplet can always be kept constant. For example, the device is suitable for a droplet application dispenser for applying various liquids on an electronic substrate.

It is a figure which shows one embodiment of this invention, and is a cross-sectional view which shows the state which sent air into the air chamber, pushed up the piston and the plunger, and opened the nozzle. It is a figure which shows one embodiment of this invention, and is the cross-sectional view which shows the state which open | released the air of the air chamber in air | atmosphere, lowered | hung the piston and the plunger, and closed the nozzle. It is a figure which shows the conventional embodiment, It is a cross-sectional view which shows the state which sent air into the air chamber, pushed up the piston and the plunger, and opened the nozzle. It is a figure which shows the conventional embodiment, It is a cross-sectional view which shows the state which open | released the air of the air chamber in air | atmosphere, lowered the piston and the plunger, and closed the nozzle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dispenser main body 2 Hole 3 Hollow part 3a Spring chamber 3b Air chamber 4 Shaft 5 Piston 6 Hollow part 7 Plunger 8 Packing 9 Coil spring 10 Adjustment knob 11 Nozzle 12 Adjustment screw 13 Air supply pipe 14 Air supply port 15 Switch valve 16 Support body 17 Air supply device 18 Liquid material supply port 19 Liquid material supply pipe 20 Liquid material outlet 21 Liquid material supply device 23 Check valve

Claims (3)

A dispenser body having a hollow portion;
A nozzle provided integrally or separately in the dispenser body;
A liquid material supply path for supplying the liquid material from the liquid material supply device into the nozzle;
A piston housed and arranged in a movable state in the hollow portion;
A plunger that is provided integrally with or separately from the piston and that extends and is disposed in the nozzle and opens and closes the liquid material outlet provided in the nozzle;
Elastic means accommodated and arranged in the hollow portion to urge the piston and plunger in one direction;
Working fluid supply / discharge means for selectively moving the piston and the plunger in the other direction against the urging force of the elastic means by supplying / discharging the working fluid in the hollow part connected to the hollow part;
A check valve that is inserted into the liquid material supply path and prevents a back flow of the liquid material when the liquid material outlet is closed by the plunger;
A droplet application dispenser comprising: The droplet application dispenser according to claim 1.
The liquid material supply path is a liquid material supply pipe disposed between the liquid material supply device and the dispenser body, and the check valve is inserted in the liquid material supply pipe. Drop application dispenser. In the droplet application dispenser according to claim 1 or 2,
The droplet application dispenser, wherein the check valve is a ball check valve.

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