JP4781057B2 - Liquid filling device - Google Patents

Description

The present invention relates to a liquid filling apparatus that fills a container or the like with a liquid .

2. Description of the Related Art Conventionally, there is, for example, the one disclosed in Patent Document 1 as a filling device that prevents liquid dripping by sucking liquid from a nozzle port after filling with liquid. In this filling device, a diaphragm mounted on a valve body of an on-off valve is arranged so as to face a filling passage, and when the filling body is fully closed by protruding the valve body, air is supplied to the back side to bulge the diaphragm. Then, after fully closing, the air is discharged and the diaphragm is restored to its original state by its elasticity, so that the filling passage is negative pressure and the liquid is sucked from the nozzle port.
JP-A-9-86595

However, when rapidly filling a large volume of liquid in a short time, there is a problem that if the nozzle diameter becomes large or the viscosity of the liquid decreases, the liquid tends to drip, increasing the liquid suction amount. It was necessary to let them.
The present invention solves the above-mentioned problems, and does not increase the suction amount, and even when the nozzle diameter is large or when a liquid with a low viscosity is filled, liquid filling can reliably prevent dripping An object is to provide an apparatus .

According to the first aspect of the present invention, an opening / closing device provided in the filling passage for opening and closing the filling passage, a nozzle cylinder having a nozzle opening formed at the outlet of the filling passage, and liquid in the nozzle opening can be sucked into the filling passage. A suction mechanism, a guide member arranged in the filling passage in the nozzle cylinder, and a gap that forms a minute space between the guide member and the nozzle port by moving the guide member through the operating rod. Forming mechanism,
The minute space is formed by the guide member being brought into contact with the seat receiving surface of the nozzle port by a seat receiving surface of the nozzle port or a plurality of suction grooves formed in the flow direction of the liquid on the guide member. Formed and configured to prevent dripping by the surface tension of the liquid,
The suction mechanism is provided on at least one of the opening / closing device and the nozzle cylinder,
At the same time as or after stopping the filling by the opening / closing device, the gap forming mechanism forms the minute space, and the suction mechanism sucks the liquid in the nozzle port into the filling passage through the minute space. It is a thing.

The invention according to claim 2 is the configuration according to claim 1,
The suction mechanism is provided in the nozzle cylinder, and sucks and discharges air to a suction diaphragm connected to the periphery of the operating rod so as to face the filling passage of the nozzle cylinder and an air chamber on the opposite side of the suction diaphragm to the filling passage. It has an airport and is configured integrally with the gap forming mechanism.

The invention according to claim 3 is the configuration according to claim 1,
The opening / closing device is composed of a diaphragm type opening / closing valve that supplies air to the second diaphragm chamber to drive the valve shaft to open and close, thereby opening and closing the valve port by the valve body,
A suction mechanism is provided in the opening / closing device, and in a first diaphragm chamber having a first diaphragm connected to the valve body, air is supplied to and discharged from a pressurizing chamber opposite to the valve port to discharge the liquid in the filling passage. It is configured to suck .

According to a fourth aspect of the present invention, in the configuration of the first aspect,
A suction mechanism is provided in each of the opening / closing device and the nozzle cylinder,
The suction mechanism provided in the nozzle cylinder sucks air into a suction diaphragm connected to the periphery of the operating rod so as to face the filling passage of the nozzle cylinder, and an air chamber on the opposite side of the suction passage of the suction diaphragm. An exhaust air port, and is configured integrally with the gap forming mechanism,
The opening / closing device is composed of a diaphragm type opening / closing valve that supplies air to the second diaphragm chamber to drive the valve shaft to open and close, thereby opening and closing the valve port by the valve body,
The suction mechanism provided in the opening / closing device supplies and discharges air to and from the pressurizing chamber on the side opposite to the valve port in the first diaphragm chamber having the first diaphragm connected to the valve body. It is configured to suck .

According to the first aspect of the present invention, the guide member is brought into contact with the seat portion of the nozzle opening to form a minute space composed of a plurality of suction grooves , and the suction port sucks the liquid in the nozzle mouth from the minute space into the filling passage. By doing so, the liquid in the vicinity of the nozzle opening can be effectively sucked into the nozzle cylinder with a small suction amount, and furthermore, dripping from the minute space can be reliably prevented by utilizing the surface tension of the liquid. . Therefore, even if it is a large-diameter nozzle port for a large flow rate and high-speed filling, or a liquid having a low viscosity, the dripping can be reliably prevented. Furthermore, since the minute space can be formed simply by bringing the guide member into contact with the seating portion of the nozzle opening, it is unnecessary to adjust the gap of the minute space between the guide member and the nozzle cylinder, and the setting becomes easy.

According to the second aspect of the present invention, since the suction mechanism is provided integrally with the gap forming mechanism, the whole can be made compact.

According to the fourth aspect of the present invention, the amount of suction from the minute space can be increased by simultaneously sucking the two suction mechanisms provided in the gap forming mechanism of the nozzle cylinder and the opening / closing device. Even in the case of a caliber nozzle opening or a liquid with low viscosity, dripping can be prevented.

The filling device according to the present invention is intended to reliably prevent liquid dripping from the nozzle port after being fully closed. After the filling passage is fully closed, a minute space is formed in the nozzle port to suck back ( Suction. As a result, the liquid around the nozzle opening is sucked from the minute space into the filling passage, the attached liquid around the nozzle opening is effectively sucked with a small amount of suction, and dripping is reliably prevented by the minute space. It is suitable for high-speed filling using a large nozzle, filling with a large flow rate and filling liquid with low viscosity.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the filling device includes an opening / closing device 2 provided in an inlet channel 1 i of the filling passage 1 to open and close the filling passage 1, and an outlet of the filling passage 1 on the outlet side of the filling passage 1. The nozzle cylinder 51 forming the flow path 1o, the suction mechanisms 5 and 50 capable of sucking the liquid in the filling passage 1, the guide member 6 disposed in the nozzle cylinder 51, the guide member 6 and the nozzle cylinder 51 A gap forming cylinder (gap forming mechanism) 53 that forms an annular minute gap (minute space) α between the nozzle port 4 and the nozzle port 4. The nozzle cylinder 51 is fixed, and the guide member 6 is driven up and down. A minute gap α is formed. Here, the minute gap α means an interval at which the liquid after suction does not drip again from the minute gap α due to its viscosity or surface tension.

  In the nozzle cylinder 51, a nozzle port 4 having a funnel-shaped seat receiving surface 4 a and an opening 4 b is formed at the lower end of the outlet channel 1 o, and a valve mounting pipe 8 having an opening / closing device 2 is connected via an elbow pipe 9. The nozzle cylinder 51 is connected to the upper part of the outlet channel 1o in the tangential direction. As shown in FIGS. 2 and 3, the guide member 6 includes a cylindrical body portion 6a and an inverted conical gap forming portion 6b at the lower end of the body portion 6a, and a plurality of rectifying blades on the outer periphery of the body portion 6a. 17 are provided in a staggered manner in a plurality of stages along the liquid flow direction at predetermined intervals in the circumferential direction. The flow straightening blades are arranged in a staggered manner to improve the flow straightening effect of the liquid that has flowed in through the elbow tube 9, and the length of the flow straightening portion along the outlet channel 1o is shortened to reduce the size. Is planned.

  The gap forming cylinder 53 is provided above the nozzle cylinder 51 to raise and lower the guide member 6 to form a minute gap α between the gap forming portion 6 b and the seat receiving surface 4 a of the nozzle port 4. The gap forming cylinder 53 is integrally provided with the suction diaphragm 11 constituting the suction mechanism 50.

  The gap forming cylinder 53 is formed with a diaphragm chamber 55, a working chamber 56, and a cylinder chamber 57 facing the upper surface of the outlet channel 1 o upward from the lower surface of the cylinder case 54. A piston 58 slidably disposed in the cylinder chamber 57, a drive rod 59 suspended downward from the piston 58, and an adjustment member 61 projecting upward from the piston 58 and capable of adjusting the protruding position. An adjustment rod 60 having an operating rod 62 that is connected to the guide member 6 and disposed between the diaphragm chamber 55 and the operating chamber 56; and a sealing diaphragm that is attached to the drive rod 59 and separates the operating chamber 56 and the cylinder chamber 57 from each other. 65, and the actuating rod 62 is pressed and driven only by the drive rod 59 in the protruding direction, and is urged by the spring in the backward direction via the flange 62a. The cylinder chamber 57 is provided with an air port 63A for supplying / discharging air A6 to / from the progress chamber 57a above the piston 58, and an air port 63B for supplying / discharging air A7 to / from the contraction chamber 57b below the piston 58. ing.

  The diaphragm chamber 55 is connected to the operating rod 62 and is provided with a suction diaphragm 11 facing the outlet channel 1o. An air port 63C for supplying and discharging air A8 is provided in the air chamber on the back surface of the suction diaphragm 11. The suction diaphragm 11, the diaphragm chamber 55, and the air port 63 </ b> C form a (sub) suction mechanism 50, and the suction mechanism 50 is configured integrally with the gap forming cylinder 53.

  Accordingly, the air A6 is supplied from the air port 63A to the progress chamber 57a, and the air A7 in the contraction chamber 57b is discharged from the air port 63B. The drive rod 59 and the operating rod 62 are advanced via the piston 58 and the guide member 6 is lowered. Then, the gap forming portion 6b is brought close to the seat receiving surface 4a of the nozzle port 4 to form an annular minute gap α. At this time, air A8 is supplied from the air port 63C to the diaphragm chamber 55, and the suction diaphragm 11 is bulged toward the outlet channel 1o. Then, after the minute gap α is formed, the air A8 in the diaphragm chamber 55 is discharged from the air port 63C, whereby the suction diaphragm 11 is returned to its original state by its elasticity, and the outlet channel 1o is set to a negative pressure so that the minute amount of the nozzle port 4 is reduced. The liquid can be sucked back (sucked) from the gap α.

  The opening / closing device 2 uses a diaphragm type opening / closing valve equipped with a (main) suction mechanism 5. That is, as shown in FIGS. 1 and 4, an inlet portion 1a, a valve port 1b, and an outlet portion 1c are formed in the inlet channel 1i of the filling passage 1 formed in the valve mounting pipe 8, and the valve port 1b Correspondingly, a valve case 21 is mounted on the valve mounting pipe 8. A first diaphragm chamber 22 is formed in the valve case 21 so as to face the valve port 1b, and the first diaphragm chamber 22 is withdrawn / retracted through a first valve shaft 23 so that a valve seat around the valve port 1b is provided. A valve body 24 that contacts and closes the valve port 1b is disposed. Also, a first diaphragm 25 connected to the valve body 24 is provided, and the first diaphragm 25 causes the first diaphragm chamber 22 to be a suction chamber 22a on the valve body 24 side and a pressurizing chamber 22b on the first valve shaft 23 side. The suction mechanism 5 includes a first diaphragm chamber 22 having a suction chamber 22a and a pressurizing chamber 22b, and a first diaphragm 25, and the suction mechanism 50 is integrated with the opening / closing device 2. It is configured.

  The valve case 21 is provided with a working chamber 27 having an annular single-acting backup cylinder 26, a second diaphragm chamber 29 having a second diaphragm 28, and a third diaphragm 30 on the back side from the first diaphragm chamber 22. A third diaphragm chamber 31 is formed sequentially. The first valve shaft 23 is slidably inserted between the first diaphragm chamber 22 and the working chamber 27 through the valve shaft hole, and the second valve shaft 32 is further connected to the second and second chambers from the working chamber 27 through the valve shaft hole. The valve case 21 is slidably inserted through the third diaphragm chambers 29 and 31, and the first valve shaft 23 and the second valve shaft 32 are detachably fitted. Further, a stopper 33 capable of adjusting the position of the valve body 24 is attached to the second valve shaft 32 protruding from the rear portion of the valve case 21.

  Further, a passive plate 34 is attached to the first valve shaft 23 in the working chamber 27. The passive plate 34 is slidably fitted into a cylinder chamber 26a of a backup cylinder 26 by the annular piston 26b. The backward movement of the passive plate 34 is restricted and is urged rearward by the spring 26c. By supplying air A1 to the cylinder chamber 26a, the passive plate 34 is retracted by the spring 26c as the piston 26b is retracted, the first valve shaft 23 is retracted, and the valve port 1b can be opened.

  In the configuration of the opening / closing device 2, as shown in FIG. 4A, air A1 is supplied to the cylinder chamber 26a, the piston 26b is retracted, and the passive plate 33 is pushed back by the spring 26c. 1 The valve shaft 23 and the valve body 24 are retracted, the valve port 1b is fully opened, and a large flow rate is filled.

  As shown in FIG. 4B, when air A2 is supplied to the pressurizing chamber of the third diaphragm chamber 31 in the large flow rate filling state, the second valve shaft 32, the first The valve shaft 23 is protruded, and the valve body 24 is brought close to the valve port 1b by a predetermined amount so that the valve port 1b is squeezed and filled down slowly.

  Further, as shown in FIG. 4C, when the air A3 is supplied to the pressurizing chamber of the second diaphragm chamber 29, the valve body 24 contacts the valve seat via the second valve shaft 32 and the first valve shaft 23. The valve port 1b is fully closed. At this time, air A4 is supplied to the pressurizing chamber 22b of the first diaphragm chamber 22, and the first diaphragm 25 is expanded toward the suction chamber 22a.

  In the fully closed state, as shown in FIG. 4 (d), the air A4 in the pressurizing chamber 22b is discharged, whereby the first diaphragm 25 is restored to its original state due to its elasticity, and the suction chamber 22a is expanded. Thus, the liquid on the outflow portion 1c side is sucked and sucked back.

  In the above-described configuration, the opening / closing device 2 is fully opened to fill the container with a large volume of liquid from the filling passage 1 through the nozzle port 4 at high speed. Next, when approaching a specified filling amount, the flow rate is reduced by setting the switching device 2 in a slow-down state. When the specified filling amount is reached, the opening / closing device 2 is fully closed, and at the same time, air A6 is supplied by the gap forming mechanism 7 and the piston 58 is driven to lower the guide member 6 so that a minute gap is formed between the nozzle opening 52 and the nozzle member 52. α is formed. At the same time, air A4 is supplied to the pressurizing chamber 22b of the first diaphragm chamber 22 of the opening / closing device 2, and the first diaphragm 25 is expanded.

  Then, in the fully closed state, the air A4 from the pressurizing chamber 22b is discharged, and the first diaphragm 25 is returned to the original state to perform suck back.

  In addition, the (sub) suction mechanism 50 integrated with the gap forming cylinder 53 is also operated simultaneously with the (main) suction mechanism 5 of the opening / closing device 2, and the air A8 in the suction chamber 55A is discharged and sucked back by the suction diaphragm 62. The suction amount of the suck back can be doubled. Of course, in the case of an opening / closing device that does not have the suction mechanism 5, the suck back may be performed only by the suction mechanism 50 integrated with the gap forming cylinder 53.

Thereby, all the liquid adhering to the vicinity of the nozzle port 4 is sucked into the outlet channel 1o of the nozzle cylinder 51 from the minute gap α. Therefore, even if it is the large-diameter nozzle opening 4 or a liquid with low viscosity , the liquid can be reliably sucked and held in the minute gap α to prevent dripping. Further, since the liquid is sucked from the minute gap α, a sufficient effect can be obtained even if the suction amount is small. Further, by simultaneously operating the suction mechanism 5 integrated with the opening / closing device 2 and the suction mechanism 50 integrated with the gap forming cylinder 53, the suction amount of the suck back can be doubled, the large-diameter nozzle port 4 and the low viscosity. Even in the case of liquids, dripping can be reliably prevented.

  The opening / closing device 2 may be an opening / closing valve that does not have a suction function. Further, in place of a diaphragm type opening / closing valve with a suction function, the elastic tube is pressed and closed at at least two locations to release the pressure on the nozzle port side. Thus, a pinch valve type opening / closing device capable of sucking the liquid by returning the elastic tube to its original state may be used.

  Furthermore, the suction mechanism can be installed independently of the opening / closing device 2 and the gap forming cylinder 53 instead of being integrated.

  In the above embodiment, the minute space is an annular minute gap α, but as shown in FIG. 5, a plurality of suction grooves 81 are formed in the gap forming portion 6b of the guide member 6 along the liquid flow direction. Thus, these suction grooves 81 can be made into a minute space β. In this case, the gap forming portion 6b of the guide member 6 is brought into contact with the seat receiving surface 4a of the nozzle cylinder 51, and the opening 4b and the outlet portion 1o are communicated with the suction groove 81 only by the minute space β.

  Further, as shown in FIG. 6, a suction groove 82 can be formed in the seat receiving surface 4a of the nozzle cylinder 51 along the liquid flow direction to form a minute space β.

  According to the embodiment of FIGS. 5 and 6, in addition to the effects of the previous embodiment, the guide member 6 may be brought into contact with the nozzle cylinder 51, and the clearance adjustment of the minute space β is unnecessary. Can be set easily.

  Note that the same annular minute gap α as in the previous embodiment may be formed to allow the opening 4b and the outlet portion 1o to communicate with the minute space β.

It is a whole longitudinal cross-sectional view which shows embodiment of the filling apparatus which concerns on this invention. It is an enlarged vertical sectional view showing a nozzle cylinder and a gap forming cylinder of the filling device. It is AA sectional drawing shown in FIG. It is a longitudinal cross-sectional view explaining operation | movement of the switchgear, (a) At the time of large flow volume filling, (b) At the time of slow down filling, (c) At the time of full closure, (d) At the time of suck back. FIG. 5 is an enlarged vertical sectional view of a nozzle port showing a micro space according to another embodiment of the filling device according to the present invention. FIG. 6 is a longitudinal sectional view of a nozzle port in which a minute space is formed, showing still another embodiment of the filling device according to the present invention.

α Fine gap β Fine space 1 Filling passage 1o Outlet flow path 2 Opening / closing device 4 Nozzle port 5,50 Suction mechanism 6 Guide member 6b Gap forming portion 11 Suction diaphragm 21 Valve case 22 First diaphragm chamber 22a Suction chamber 24 Valve body 25 First 1 Diaphragm 51 Nozzle cylinder 53 Clearance forming cylinder 55 Diaphragm chamber 57 Cylinder chamber 58 Piston 62 Actuating rod 81, 82 Suction groove

Claims (4)

An opening / closing device provided in the filling passage for opening and closing the filling passage, a nozzle cylinder having a nozzle opening formed at the outlet of the filling passage, a suction mechanism capable of sucking the liquid in the nozzle opening into the filling passage, and the inside of the nozzle cylinder in comprising a guide member disposed within the filling passage, and a gap forming mechanism for forming a minute space between the guide member and the nozzle opening by projecting and retracting the guide member via the actuating rod,
The minute space is formed by the guide member being brought into contact with the seat receiving surface of the nozzle port by a seat receiving surface of the nozzle port or a plurality of suction grooves formed in the flow direction of the liquid on the guide member. Formed and configured to prevent dripping by the surface tension of the liquid,
The suction mechanism is provided on at least one of the opening / closing device and the nozzle cylinder,
At the same time as or after stopping the filling by the opening / closing device, the gap forming mechanism forms the minute space, and the suction mechanism sucks the liquid in the nozzle port into the filling passage through the minute space. Liquid filling device. The suction mechanism is provided in the nozzle cylinder, and sucks and discharges air to a suction diaphragm connected to the periphery of the operating rod so as to face the filling passage of the nozzle cylinder and an air chamber on the opposite side of the suction diaphragm to the filling passage. The liquid filling apparatus according to claim 1 , further comprising an airport and integrally formed with the gap forming mechanism . The opening / closing device is composed of a diaphragm type opening / closing valve that supplies air to the second diaphragm chamber to drive the valve shaft to open and close, thereby opening and closing the valve port by the valve body,
A suction mechanism is provided in the opening / closing device, and in a first diaphragm chamber having a first diaphragm connected to the valve body, air is supplied to and discharged from a pressurizing chamber opposite to the valve port to discharge the liquid in the filling passage. The liquid filling apparatus according to claim 1, wherein the liquid filling apparatus is configured to suck . Each opening and closing device and nozzle cylinder are provided with a suction mechanism,
The suction mechanism provided in the nozzle cylinder sucks air into a suction diaphragm connected to the periphery of the operating rod facing the filling passage of the nozzle cylinder, and an air chamber on the opposite side of the suction passage of the suction diaphragm. An air port for discharging, and is configured integrally with the gap forming mechanism,
The opening / closing device is constituted by a diaphragm type opening / closing valve that supplies air to the second diaphragm chamber to drive the valve shaft to open and close to open / close the valve port.
The suction mechanism provided in the opening / closing device supplies and discharges air to and from the pressurizing chamber on the side opposite to the valve port in the first diaphragm chamber having the first diaphragm connected to the valve body. The liquid filling apparatus according to claim 1, wherein the liquid filling apparatus is configured to suck .

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