JP4766445B2 - Liquid discharge valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve for discharging a liquid material, in which the liquid material is prevented from infiltrating into the outside of a cylindrical body to control the discharge amount of the liquid material with high precision and shorten the time to pack the liquid material. <P>SOLUTION: The outside diameter of a diameter-reduced part 22B of a plunger 22 constituting the shut valve 20 for discharging the liquid material is made slightly smaller than the inside diameter of a diameter-reduced part 21C of the cylindrical body 21, so that the diameter-reduced part of the plunger can slide in a through-hole internal space 21b to be formed by the inner peripheral surface of the diameter-reduced part 21C. When the diameter-reduced part 22B of the plunger 22 reaches the position that the liquid material is discharged, the plunger 22 is opposed to a liquid material inflow through-hole 21d and closes the liquid material inflow through-hole 21d and the tip of the plunger 22 is projected from one open end 21A of the cylindrical body 21. The bottom end surface 22C of the plunger 22 is formed to have a hemispherically curved surface, namely, a recessed shape opened downward to the vertical direction. An acute angle is formed by the bottom end surface 22C of the plunger 22 and the diameter-reduced part 22B of the plunger 22. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a liquid material discharge valve, and more particularly to a liquid material discharge valve capable of discharging a predetermined amount of a highly viscous liquid material with high accuracy.

  2. Description of the Related Art Conventionally, an automatic filling machine that injects a predetermined amount of a highly viscous liquid material stored in a tank into a small pod has been used. The automatic filling machine has a tank, a pod, and a pipe member having one end communicating with the inside of the tank and defining a highly viscous liquid material passage. A valve having a plunger is provided at the other end of the tube member. A high-viscosity liquid is stored in the tank, and the high-viscosity liquid is filled into the valve through the high-viscosity liquid passage and discharged from the valve. When the plunger is driven, the discharge from the valve ends. It is configured as follows.

  Japanese Patent Laying-Open No. 2003-212214 (Patent Document 1) describes a filling valve that is a liquid discharge valve. The filling valve includes a valve body as a plunger and a tubular body, and the valve body is movable in the axial direction of the tubular body in a space defined by the inner peripheral surface of the tubular body. The valve body can be pressed against a valve seat defining an opening formed at one end of the cylindrical body, and the filling valve is closed when the valve body is in pressure contact. Further, the filling valve is opened when the valve body is separated from the valve seat.

  Further, a liquid material inflow hole is formed in the cylindrical body, and a liquid material supply pipe is connected to the liquid material inflow hole. The liquid supply pipe is configured to be able to supply a hot melt adhesive.

The hot melt adhesive supplied to the liquid supply pipe flows into the cylindrical body and fills the cylindrical body. The hot-melt adhesive filled in the cylindrical body by separating the valve body from the valve seat is discharged from an opening defined by the valve seat. Thereafter, when the valve body is pressed against the valve seat and the focus valve is closed, the discharge of the hot melt adhesive from the opening defined by the valve seat is completed.
JP 2003-212214 A

  However, in the above-described filling valve that is a liquid material discharge valve, when the filling valve is closed after the liquid material is discharged, the high-viscosity liquid material goes around to the outside of the end of the cylindrical body provided with the valve seat. In some cases, it may adhere. When the liquid material wraps around and adheres to the outside of the cylindrical body in this way, the amount of the liquid material discharged is reduced by the amount attached, and the amount of the liquid material discharged cannot be managed with high accuracy. .

  In particular, when a paste made of a conductive material used for manufacturing an electronic component is discharged as a liquid, the size of one electronic component is extremely small, and the amount of the liquid used for manufacturing the electronic component is very small. Therefore, for example, it is necessary to manage the discharge amount with extremely high accuracy of 2 kg ± 1 g. In such a case, if the liquid material goes around the outside of the cylindrical body and adheres to the outside, it becomes very difficult to manage the discharge amount.

  In addition, in the automatic filling machine, the discharge amount is set to a desired value when the liquid material attached to the outside finishes dripping on the pod. It is necessary to wait until the attached liquid has finished dripping, and for this reason, the time required for filling the pod by the automatic filling machine has been increased.

  Accordingly, the present invention provides a liquid material discharge valve that can prevent the liquid material from wrapping around the outside of the cylindrical body, manage the discharge amount with high accuracy, and shorten the filling time. With the goal.

In order to achieve the above object, according to the present invention, a liquid material inflow hole communicating with a through hole is formed, and at least a part of the space in the through hole, and an opening end side of one end of the through hole is a liquid material receiving space. A cylindrical body acting as a liquid body, a liquid body receiving position that communicates the liquid body inflow hole with the liquid body receiving space and defines the liquid body receiving space by cooperation of a tip portion and the through-hole, An outer shape that is slidable with respect to the through-hole between the liquid material inflow hole and the liquid material discharge position for discharging the liquid material in the liquid material receiving space to the outside and orthogonal to the sliding direction A plunger whose cross-sectional shape substantially matches the cross-sectional shape of the through hole, and a liquid material supply portion connected to the liquid material inflow hole, and at the liquid material discharge position of the plunger, the plunger tip is the cylinder Projecting from the open end of the rod-shaped body and the tip of the plunger Parts are angle between the plunger outer peripheral surface and the front end face at an acute angle of the concave shape, it consists curved forming a semi-spherical shape, in the inside of the plunger, to open the gas supply device to the distal end surface of the plunger A liquid discharge valve is provided in which a connectable gas ejection passage is formed .

  Since the cross-sectional shape of the outer shape of the plunger orthogonal to the sliding direction is substantially the same as the cross-sectional shape of the through-hole, the liquid material inflow hole is closed when the plunger is at the liquid material discharge position. Can be prevented from being clogged due to drying and solidification by contact with outside air.

  Further, at the liquid material discharge position of the plunger, the plunger tip protrudes beyond the cylindrical body opening end, and the plunger tip has a concave shape with an acute angle formed between the plunger outer peripheral surface and the tip surface. For this reason, it is possible to suppress the liquid material from wrapping around the outside of the cylindrical body opening end. For this reason, the amount of the liquid material adhering to the outside of the opening end of the cylindrical body can be reduced as much as possible, and the time taken for the adhering liquid material to finish dripping onto the pod or the like as the discharge destination is reduced as much as possible. be able to. Further, since the amount of the liquid material around which the liquid material wraps around can be suppressed, the amount of the discharged liquid material can be managed with high accuracy.

Moreover, since the front end surface of the plunger is formed of a curved surface, it is possible to more effectively prevent the liquid material from turning not only to the outside of the plunger but also to the outside of the cylindrical body opening end.

In addition, since a gas jet passage that is open at the front end surface of the plunger and can be connected to the gas supply device is formed inside the plunger, the liquid attached to the front end surface of the plunger can be blown off by the gas. Furthermore, when the tip end surface of the plunger is a curved surface, it is possible to prevent the liquid material from being blown away in a direction away from the virtual extension line of the sliding shaft of the plunger as much as possible.

  As described above, it is possible to provide a liquid discharge valve that can prevent the liquid from wrapping around the outside of the cylindrical body, manage the discharge amount with high accuracy, and reduce the filling time.

  A liquid material discharge valve according to an embodiment of the present invention will be described with reference to FIGS. First, a liquid automatic filling apparatus provided with a liquid discharge valve will be described. As shown in FIG. 1, the liquid automatic filling device 1 includes a supply valve 11, a pressure vessel 12, an outlet valve 13, a throttle valve 14, and a shut valve 20 that is a liquid discharge valve, and these are connected to each other. A pipe member 15 to be connected, a pod 16, a measuring instrument 17, a material tank 18 constituting a liquid supply device, and a vacuum valve 12A are provided. Further, the control device is connected to the supply valve 11, the vacuum valve 12A, the pressurizing valve 12B, the outlet valve 13, the throttle valve 14, the shut valve 20 as the liquid material discharge valve, and the meter 17 and controls them. 19 is provided.

  The supply valve 11 is connected to the material tank 18 and the outlet valve 13 by a pipe member 15. The pipe member 15 connecting the supply valve 11 and the outlet valve 13 is branched in the middle, and the pressure vessel 12 is connected to the branched pipe member 15. The vacuum valve 12A is connected to the pressure vessel 12, and a vacuum device (not shown) is connected to the vacuum valve 12A. By opening the supply valve 11 and the vacuum valve 12A while the outlet valve 13 is closed, the liquid material can be supplied from the material tank 18 to the pressure vessel 12 with a negative pressure in the pressure vessel 12.

  A pressure valve 12B is connected to the pressure vessel 12, and a pressure device (not shown) is connected to the pressure valve 12B. The liquid in the pressure vessel 12 can be pressurized by opening the pressure valve 12B. By pressurizing the liquid in the pressure vessel 12 by opening the pressure valve 12B with the supply valve 11 and the vacuum valve 12A closed and the outlet valve 13 and the throttle valve 14 open, the pressure vessel 12 The liquid material inside is configured to be supplied to the shut valve 20.

  A pod 16 is disposed vertically below the shut valve 20, and a liquid material can be discharged from the shut valve 20 to the pod 16. The pod 16 is placed on the measuring instrument 17, and the amount of the liquid material discharged from the shut valve 20 into the pod 16 can be measured by the measuring instrument 17. The liquid used is a highly viscous nickel paste containing Ni powder, barium titanate and terpineol, the temperature is maintained at 25 ° C., the specific gravity is 2, and the viscosity is 10 PaS.

  Next, the shut valve 20 which is a liquid material discharge valve will be described. As shown in FIGS. 2 and 3, the shut valve 20 includes a substantially cylindrical tubular body 21, a plunger 22, and a liquid supply pipe 23. At the one end and the other end of the cylindrical body 21, spaces defined by the inner peripheral surface of the cylindrical body 21 are opened to form one end opening end 21A and the other end opening end 21B, The direction connecting the one end opening end 21A and the other end opening end 21B coincides with the vertical direction, and the one end opening end 21A is positioned vertically below the other end opening end 21B.

  A portion near the opening end 21A of the cylindrical body 21 forms a reduced diameter portion 21C having a smaller inner diameter and outer diameter, and a portion closer to the opening end 21B of the other end portion has an inner diameter and an outer diameter than the reduced diameter portion 21C. An enlarged diameter portion 21D having a large diameter is formed. An air cylinder 24 having a piston (not shown) is fixedly provided at the other end opening end 21B of the cylindrical body 21, and is in a space defined by the inner peripheral surface of the enlarged diameter portion 21D from the air cylinder 24. A piston shaft 24A connected to a piston (not shown) extends toward the end. The piston shaft 24A is connected to the plunger 22 via the connecting member 25 in the enlarged diameter portion 21D. An air supply device (not shown) is connected to the air cylinder 24 so that air can be supplied into the air cylinder 24. To seal the inner peripheral surface of the portion of the cylindrical body 21 to which the reduced diameter portion 21 </ b> C and the enlarged diameter portion 21 </ b> D of the cylindrical body 21 are connected between the plunger 22 and the cylindrical body 21 described later. The sealing member 26 is provided.

  A pair of elongated holes 21a and 21a are formed at predetermined positions of the enlarged diameter portion 21D. The pair of long holes 21 a and 21 a are formed at positions in the diameter direction of the cylindrical body 21, and the longitudinal direction thereof is directed in the vertical direction, and is expanded from the vicinity of the other end opening end 21 </ b> B of the cylindrical body 21. It is formed up to the vicinity of the connection position between the diameter portion 21D and the reduced diameter portion 21C.

  The space defined by the inner peripheral surface of the reduced diameter portion 21C forms a through-hole inner space 21b, and is a part of the through-hole inner space 21b and opens at one end of the cylindrical body 21 as shown in FIG. The portion on the end 21A side forms a liquid material receiving space 21c into which the liquid material flows. As shown in FIG. 2, the portion defining the liquid material receiving space 21c of the reduced diameter portion 21C includes the side surface 21E of the reduced diameter portion 21C and the inner periphery of the reduced diameter portion 21C defining the liquid material receiving space 21c. A liquid material inflow through hole 21d is formed in each of the surfaces. Further, the liquid supply pipe 23 is provided to extend in the horizontal direction from the side surface 21E of the reduced diameter portion 21C where the liquid inflow through hole 21d is formed. For this reason, the liquid inflow through hole 21d is An opening is made in a space defined by the inner peripheral surface of the liquid supply pipe 23.

  As shown in FIGS. 2 and 3, the extended end of the liquid supply pipe 23 is connected to the other end of the pipe member 15 of the liquid automatic filling apparatus 1 whose one end is connected to the throttle valve 14 (FIG. 1). It is connected. The liquid material supply pipe 23 corresponds to a liquid material supply portion, and the liquid material inflow through hole 21d corresponds to a liquid material inflow hole.

  The plunger 22 has a substantially cylindrical shape, and the axial direction is oriented in the vertical direction as shown in FIGS. The upper end portion of the plunger 22 is an enlarged diameter portion 22A, and the other portion is a reduced diameter portion 22B having an outer diameter substantially the same as the inner diameter of the reduced diameter portion 21C of the cylindrical body 21. More precisely, the outer diameter of the reduced diameter portion 22B of the plunger 22 is slightly smaller than the inner diameter of the reduced diameter portion 21C of the cylindrical body 21, and the through hole internal space defined by the inner circumferential surface of the reduced diameter portion 21C. It can slide in 21b.

  Since the liquid has a high viscosity, it can be prevented from entering between the inner peripheral surface of the reduced diameter portion 21C and the peripheral surface of the reduced diameter portion 22B of the plunger 22. When the liquid material enters, it comes into contact with the outside air, and clogging occurs due to the liquid material touching the outside air and drying and solidifying in the liquid material receiving space 21c. Occurrence can be prevented.

  The diameter-reduced portion 22B of the plunger 22 is driven by the air cylinder 24, so that the liquid material receiving position that is a relatively vertically upward position and the liquid material discharging position that is a relatively vertically downward position are located in the through-hole space 21b. It can slide between positions. When the reduced diameter portion 22B of the plunger 22 is in the liquid material receiving position, as shown in FIG. 2, since the plunger 22 does not face the liquid material inflow through hole 21d, the liquid is passed through the liquid material inflow through hole 21d. The body receiving space 21c and the space defined by the inner peripheral surface of the liquid supply pipe 23 communicate with each other. The liquid material receiving space 21 c is defined by a lower end surface 22 </ b> C that is a distal end surface of the distal end portion that is the lower end portion of the plunger 22 and an inner peripheral surface of the reduced diameter portion 21 </ b> C of the cylindrical body 21.

  When the reduced diameter portion 22B of the plunger 22 is in the liquid material discharge position, as shown in FIG. 3, the plunger 22 faces the liquid material inflow through hole 21d, and the liquid material inflow through hole 21d is closed. The plunger 22 protrudes from the one end opening end 21 </ b> A of the cylindrical body 21, and the liquid material in the liquid material receiving space 21 c is discharged by the plunger 22 to the outside of the cylindrical body 21. Yes. Thus, since the lower end part which is the front-end | tip part of the plunger 22 protrudes from 21 A of one end opening ends of the cylindrical body 21, it suppresses that a liquid body wraps around the outer side of the one end opening end 21A of the cylindrical body 21. it can.

  As shown in FIG. 4, the lower end surface 22C constituting the lower end portion of the plunger 22 is formed of a curved surface. The lower end surface 22C is configured by a hemispherical curved surface, and the diameter position of the hemisphere coincides with the lower end of the plunger 22 and is connected to the side surface 22D which is the outer peripheral surface of the reduced diameter portion 22B of the plunger 22. Therefore, the lower end surface 22C of the plunger 22 and the side surface 22D of the reduced diameter portion 22B of the plunger 22 form an acute angle as shown in FIG. A lower end surface 22C configured by a curved surface forming a concave shape that opens vertically downward. The radius of the lower end face 22C of the hemispherical plunger 22 is 5 mm, and the diameter of the opening at the lower end of the recessed portion defined by the lower end face 22C at the lower end of the plunger 22 is 10 mm.

  Since the lower end portion of the plunger 22 is configured in this way, it is possible to prevent the liquid material from flowing outside the one end opening end 21 </ b> A of the cylindrical body 21. For this reason, the amount of the liquid material adhering to the outside of the one end opening end 21A of the cylindrical body 21 can be reduced as much as possible, and the time taken for all of the adhering liquid material to finish dripping onto the pod 16 as the discharge destination. Can be shortened as much as possible. Further, since the amount of the liquid material that wraps around and adheres can be suppressed, the amount of the liquid material discharged from the shut valve 20 can be managed with high accuracy. Further, since the lower end surface 22C of the plunger 22 is formed of a curved surface, the liquid material can be more effectively prevented not only from the outside of the plunger 22 but also from the outside of the one end opening end 21A of the cylindrical body 21. .

  A gas ejection passage 22 a is formed inside the plunger 22. As shown in FIGS. 2 and 3, the gas ejection passage 22 a opens at the lower end surface 22 </ b> C of the plunger 22, and expands the diameter 22 </ b> A of the plunger 22 from the lower end surface 22 </ b> C of the plunger 22 along the axial center position of the plunger 22. It is formed to extend to a predetermined position, is bent vertically, and is open at the side surface 22E of the enlarged diameter portion 22A. The diameter of the gas ejection passage 22a in the reduced diameter portion 22B of the plunger 22 is 2 mm.

  As shown in FIG. 2 and FIG. 3, a gas supply pipe 27 is connected to the opening of the gas ejection passage 22a opened on the side surface 22E of the enlarged diameter portion 22A. The gas supply pipe 27 extends to the outside of the cylindrical body 21 through the elongated hole 21a of the cylindrical body 21, and is connected to a gas supply device (not shown). A gas supply device (not shown) is configured to supply gas at a high pressure so that the gas can be discharged from an opening in the lower end surface 22C of the plunger 22 via the gas ejection passage 22a. By discharging the gas, the liquid material attached to the lower end surface 22C of the plunger 22 can be blown off. At this time, since the lower end surface 22C of the plunger 22 is formed of a curved surface, it is possible to prevent the liquid material from being blown away in a direction away from the virtual extension line of the axis of the plunger 22 as much as possible.

  The operation of the liquid automatic filling device 1 provided with the shut valve 20 as a liquid discharge valve is as follows. First, the control device 19 closes the outlet valve 13 and opens the supply valve 11 and the vacuum valve 12 </ b> A to inject the liquid material from the material tank 18 into the pressure vessel 12. Next, the control device 19 closes the supply valve 11 and the vacuum valve 12A, pressurizes the liquid in the pressure vessel 12 by opening the pressurization valve 12B, opens the outlet valve 13 and the throttle valve 14, As shown in FIG. 2, the plunger 22 of the shut valve 20 is moved to the liquid material receiving position. As a result, the liquid material is injected into the liquid material receiving space 21 c of the shut valve 20 through the outlet member 13, the throttle valve 14, and the liquid material inflow through hole 21 d via the pipe member 15. The pod 16 is discharged from one end opening end 21A.

  While the liquid material is being discharged to the pod 16, the amount of the liquid material is continuously measured by the meter 17, and it is measured that a predetermined amount less than the fixed amount to be discharged to the pod 16 has been discharged to the pod 16. When this is done, a pre-quantitative signal is output from the meter 17 to the control device 19, and the control device 19 closes the throttle valve 14 based on the pre-quantitative signal. Next, when a fixed amount to be discharged to the pod 16 is weighed, a fixed amount signal is output from the meter 17 to the control device 19, and based on the fixed amount signal, the control device 19, as shown in FIG. The 20 plungers 22 are slid to the liquid material discharge position, and the shut valve 20 is closed. Here, the fixed amount is a highly accurate amount of 2 kg ± 1 g.

  Next, gas is supplied at a high pressure from a gas supply device (not shown), gas is discharged from the opening in the lower end surface 22C of the plunger 22 through the gas ejection passage 22a, and the liquid material adhered to the lower end surface 22C of the plunger 22 is discharged. Blow away. Thus, the discharge of the fixed amount of liquid material to the pod 16 is completed. In practice, the above series of steps are repeated.

  The liquid material discharge valve according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the cylindrical body has a substantially cylindrical shape, but is not limited thereto. For example, the cylindrical body may have a prismatic cylindrical shape. Further, when the space defined by the inner peripheral surface of the cylindrical body has a prismatic shape, as shown in FIG. 5, the plunger 122 has a prismatic shape substantially the same as the prismatic shape as shown in FIG. . Even in this case, the lower end surface 122C of the plunger 122 is formed by a curved surface, and the lower end surface 122C and the side surface 122D of the plunger 122 form an acute angle.

  Moreover, the dimension of the plunger 22 or the cylindrical body 21 is not limited to the value of the above-mentioned Example. Further, the lower end surface 22C of the plunger 22 has a hemispherical shape, but is not limited to a hemispherical shape, and may be, for example, an elliptical shape. Moreover, the liquid used is not limited to the nickel paste described above. Any liquid material having high viscosity may be used. Moreover, in this Embodiment, although the plunger 22 was slid by the air cylinder 24, it is not limited to this. For example, a hydraulic cylinder or the like may be used.

  The liquid material discharge valve of the present invention is particularly useful in the field of valves that require high-precision discharge amount control by switching between discharge and stop of discharge of a liquid material such as highly viscous nickel paste. is there.

Schematic which shows a liquid filling apparatus provided with the valve for liquid discharge by embodiment of this invention. Sectional drawing which shows the state which the plunger of the valve | bulb for liquid discharge by embodiment of this invention exists in a liquid receiving position. Sectional drawing which shows the state which the plunger of the valve for liquid discharge by embodiment of this invention exists in a liquid discharge position. The principal part sectional drawing which shows the front-end | tip part surface of the plunger of the liquid discharge valve by embodiment of this invention, and its vicinity. The perspective view which shows the modification of the plunger of the liquid discharge valve by embodiment of this invention.

Explanation of symbols

20 Shut valve 21 Tubular body 21A One end opening end 21b Through hole inner space 21c Liquid material receiving space 21d Liquid material inflow through hole 22 Plunger 22C Lower end surface 22D Side surface 22a Gas ejection passage 23 Liquid material supply pipe

Claims (1)

A liquid body inflow hole communicating with the through hole is formed, and a cylindrical body that is at least a part of the space in the through hole and the opening end side of one end of the through hole acts as a liquid material receiving space;
The liquid material inflow hole is communicated with the liquid material receiving space, and the liquid material receiving position that defines the liquid material receiving space by the cooperation of the tip and the through hole is closed, and the liquid material inflow hole is closed. The liquid material in the liquid material receiving space can be slidably moved with respect to the through hole between the liquid material discharge position for discharging the liquid material to the outside, and the cross-sectional shape of the outer shape orthogonal to the sliding direction is A plunger that substantially matches the cross-sectional shape;
A liquid supply unit connected to the liquid inlet hole,
At the liquid material discharging position of the plunger, the plunger tip protrudes from the cylindrical body opening end,
The tip portion of the plunger has a concave shape with an acute angle formed between the outer peripheral surface of the plunger and the tip surface, and consists of a hemispherical curved surface,
A liquid discharge valve characterized in that a gas ejection passage is formed in the plunger and is open to the tip end surface of the plunger and connectable to a gas supply device .

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