Liquid filling device

Abstract

To provide a liquid filling device capable of securing sealability by a synthetic resin sealing member even when a high-temperature liquid is supplied to a liquid supply passage.SOLUTION: A liquid filling device 1 for filling a liquid 3 in a body 2 to be filled comprises: a liquid supply part 13; a nozzle 20 having a supply port 21 and a sealing face 22; a drive rod 31 arranged inside a liquid supply passage 11 so as to be vertically movable; and a sealing member 32 fixed on the drive rod 31. A space 60 is provided between a support face 31b of the drive rod 31 and an opposing face 32b of the sealing member 32.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a liquid filling device for filling a liquid into an object to be filled. [Background technology]

[0002] In a liquid blow molding apparatus for manufacturing synthetic resin containers by liquid blow molding, in which a liquid is used as a pressurized medium, a liquid filling device is used to fill (supply) pressurized liquid into a preform, which is the object to be filled.

[0003] For example, Patent Document 1 describes a liquid filling device that includes a liquid supply section that supplies liquid to a liquid supply path, a nozzle that has a supply port connected to the liquid supply path and a sealing surface provided upstream of the supply port, a drive rod that is arranged inside the liquid supply path so that it can move freely in vertical directions, and a sealing member that has an abutment surface facing the sealing surface and is fixed to the drive rod, wherein the abutment surface of the sealing member abuts against the sealing surface to close the supply port, and when liquid blow molding is performed, the drive rod moves upward and the abutment surface of the sealing member moves away from the sealing surface, opening the supply port and supplying pressurized liquid to the preform. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-130799 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional liquid filling device described above, the liquid is filled under pressure, so the inside of the liquid supply passage is always filled with liquid, and therefore the supply passage needs to be sealed with a seal member. Therefore, in order to improve the sealing performance of the seal member at the supply port, it is preferable to use a seal member made of synthetic resin.

[0006] However, in a configuration using a synthetic resin sealing member, when hot water is supplied to the liquid supply path for cleaning or when a high-temperature liquid is filled into a filling object, the contact surface of the sealing member is affected by the heat, reducing the sealing ability, and there is a risk of the liquid leaking from the supply port. If the liquid leaks from the supply port, the mold or the container, which is the product, will be contaminated by the leaked liquid.

[0007] To address this issue, it is possible to use a metal seal member instead of a synthetic resin seal member, but using a metal seal member makes it difficult to ensure sealing performance and also raises the risk of metal powder being mixed into the liquid.

[0008] The present invention has been made in consideration of such problems, and its purpose is to provide a liquid filling device that can ensure sealing performance using a sealing member made of synthetic resin even when high-temperature liquid is supplied to the liquid supply path. [Means for solving the problem]

[0010] The liquid filling device of the present invention is a seal member made of synthetic resin that moves together with the drive rod between a closed position where the abutment surface abuts against the seal surface to close the supply port and an open position where the abutment surface moves away from the seal surface to open the supply port; a liquid supply section that supplies liquid to a liquid supply channel; a nozzle that includes a supply port connected to the liquid supply channel and a sealing surface provided upstream of the supply port; a support surface facing the nozzle and an engaged portion provided on the support surface, the drive rod being arranged to be free to move up and down inside the liquid supply channel; and a seal member made of synthetic resin that includes a contact surface facing against the sealing surface, an opposing surface facing against the support surface, and an engaging portion provided on the opposing surface, the engaging portion engaging with the engaged portion to be fixed to the drive rod, the seal member moving together with the drive rod between a closed position where the abutment surface abuts against the seal surface to close the supply port and an open position where the abutment surface moves away from the seal surface to open the supply port; and a gap is provided between the support surface and the opposing surface. The engaging portion is a male threaded portion protruding from the opposing surface, the engaged portion is a screw hole, and the axial dimension of the engaging portion is set larger than the axial dimension of the engaged portion. Characterized by .

[0011] The liquid filling device of the present invention is a seal member made of synthetic resin that moves together with the drive rod between a closed position where the abutment surface abuts against the seal surface to close the supply port and an open position where the abutment surface moves away from the seal surface to open the supply port; a liquid supply section that supplies liquid to a liquid supply channel; a nozzle that includes a supply port connected to the liquid supply channel and a sealing surface provided upstream of the supply port; a support surface facing the nozzle and an engaged portion provided on the support surface, the drive rod being arranged to be free to move up and down inside the liquid supply channel; and a seal member made of synthetic resin that includes a contact surface facing against the sealing surface, an opposing surface facing against the support surface, and an engaging portion provided on the opposing surface, the engaging portion engaging with the engaged portion to be fixed to the drive rod, the seal member moving together with the drive rod between a closed position where the abutment surface abuts against the seal surface to close the supply port and an open position where the abutment surface moves away from the seal surface to open the supply port; and a gap is provided between the support surface and the opposing surface. The engaging portion is a male screw portion protruding from the opposing surface, the engaged portion is a screw hole, the axial dimension of the engaging portion is set to be the same as the axial dimension of the engaged portion, and a spacer member is disposed between the tip surface of the engaging portion and the bottom surface of the engaged portion. Characterized by .

[0012] In the liquid filling device of the present invention having the above configuration, it is preferable that the supply port is configured in a cylindrical shape extending downward from the inner peripheral edge of the sealing surface.

[0013] In the above configuration, the liquid filling device of the present invention preferably further comprises an extension portion integrally formed on the lower end of the sealing member and positioned inside the supply port when the sealing member is in the closed position; a suction hole formed on the extension portion and having one end opening at the lower end of the extension portion and the other end opening on the outer peripheral surface of the extension portion; a suction path formed on the nozzle and communicating with the other end of the suction hole when the sealing member is in the closed position; and a negative pressure supply source connected to the suction path. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a liquid filling device that can ensure sealing performance using a sealing member made of synthetic resin even when a high-temperature liquid is supplied to a liquid supply passage. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an enlarged cross-sectional view showing a main part of a liquid filling device according to an embodiment of the present invention. [Figure 2] 2 is an enlarged cross-sectional view showing a main part of the seal member and the drive rod shown in FIG. 1. FIG. [Figure 3] FIG. 3 is a bottom view of the sealing member shown in FIG. 2. [Figure 4] 2 is a cross-sectional view of the liquid filling device shown in FIG. 1 in a state where the sealing member is in an open position and the object to be filled is being filled with liquid. FIG. [Figure 5] 2 is a cross-sectional view of the liquid filling device shown in FIG. 1 in a state where the sealing member is in a closed position after the object to be filled has been filled with liquid. [Figure 6] FIG. 10 is an enlarged cross-sectional view showing a main part of a seal member and a drive rod according to a modified example. [Figure 7] FIG. 10 is an enlarged cross-sectional view showing a main part of a seal member and a drive rod according to another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a liquid filling device according to an embodiment of the present invention will be described in more detail with reference to the drawings.

[0017] The liquid filling device 1 according to one embodiment of the present invention shown in Figure 1 constitutes a liquid blow molding device that fills (supplies) a pressurized liquid 3 into a filled object 2, which is a preform made of synthetic resin, and liquid blow molds the filled object 2 into a container of a predetermined shape.

[0018] In this embodiment, the object to be filled 2 is a preform made of a synthetic resin material such as polypropylene (PP) or polyethylene terephthalate (PET) and formed in a roughly test-tube shape with a mouth 2a and a cylindrical body 2b with a bottom. The object to be filled 2 is heated to a predetermined temperature and placed in a blow molding mold 4 located below the liquid filling device 1 with the mouth 2a open upward.

[0019] The filling body 2 may be a preform made of other materials and in other shapes.

[0020] Liquid filling device 1 has a main body block 10. In this embodiment, main body block 10 is provided with a liquid supply passage 11 extending vertically inside. Liquid supply passage 11 is connected to liquid supply unit 13 via piping 12. Liquid supply unit 13 is formed, for example, by a plunger pump, and can supply liquid 3 pressurized to a predetermined pressure to liquid supply passage 11 via piping 12. Liquid supply unit 13 can also supply liquid (hot water, etc.) heated to a predetermined temperature to liquid supply passage 11 via piping 12 when cleaning liquid supply passage 11.

[0021] A nozzle 20 is attached to the lower end of the main body block 10. The nozzle 20 has a supply port 21 that is connected to the liquid supply path 11 and opens downward, and a sealing surface 22 that is provided upstream of the supply port 21 (upper side in FIG. 1).

[0022] In this embodiment, the supply port 21 is cylindrical and extends downward from the inner circumferential edge of the sealing surface 22 so as to be insertable into the inside of the mouth portion 2a of the object 2 to be filled.

[0023] A clamping portion 23 having a larger diameter than the supply port 21 is integrally provided above the supply port 21. The nozzle 20 is fixed to the main body block 10 by clamping the clamping portion 23 between a stepped surface 14 provided on the inner peripheral surface of the main body block 10 and a support block 15 fixed to the lower end of the main body block 10.

[0024] The sealing surface 22 is provided as the upper surface of the clamping portion 23, and is a tapered surface whose diameter gradually decreases from the top to the bottom. Note that the sealing surface 22 is not limited to a tapered surface.

[0025] The liquid filling device 1 is provided with a seal body 30 that opens and closes the supply port 21 of the nozzle 20. The seal body 30 has a drive rod 31 and a seal member 32.

[0026] Drive rod 31 is disposed inside liquid supply channel 11 and extends vertically along axis O of liquid supply channel 11. Driven by a drive source (not shown), drive rod 31 is movable vertically toward and away from nozzle 20. A connecting portion 31a having a larger diameter than the upper portion is integrally formed at the lower end of drive rod 31. As shown in Figures 1 and 2, the lower surface of connecting portion 31a facing nozzle 20 forms flat support surface 31b perpendicular to axis O. Support surface 31b is provided with a screw hole 31c as an engaged portion that is recessed to a predetermined depth coaxially with axis O.

[0027] The seal member 32 is made of synthetic resin and includes an abutment surface 32a facing the seal surface 22, an opposing surface 32b facing the support surface 31b of the drive rod 31, and a male thread portion 32c serving as an engagement portion that protrudes from the opposing surface 32b at a predetermined height coaxially with the axis O. In this embodiment, the abutment surface 32a is provided as the lower surface of the seal member 32 and is a tapered surface shaped to correspond to the seal surface 22.

[0028] The sealing member 32 is fixed to the connecting portion 31a of the driving rod 31 by threading the male thread portion 32c into a screw hole 31c provided in the connecting portion 31a of the driving rod 31. This allows the sealing member 32 to move freely together with the driving rod 31 between a closed position (position shown in FIG. 1) where the abutment surface 32a abuts against the sealing surface 22 to close the supply port 21, and an open position (position shown in FIG. 6) where the abutment surface 32a is separated from the sealing surface 22 to open the supply port 21.

[0029] The seal member 32 may also be configured such that an extension 33 is integrally provided at the lower end thereof.

[0030] 2, extension portion 33 is cylindrical and has approximately the same diameter and axis as the inner peripheral surface of supply port 21, and extends downward from the inner peripheral edge of contact surface 32a. When seal member 32 is in the closed position, extension portion 33 is disposed inside supply port 21. At this time, the outer peripheral surface of extension portion 33 is in sliding contact with or close to the inner peripheral surface of supply port 21, and the tip surface on the downstream side (the lower side in FIG. 1) of extension portion 33 is disposed flush with the tip surface on the downstream side of supply port 21.

[0031] The extension 33 is provided with a suction hole 33a. The suction hole 33a is an L-shaped flow path with one end opening at the lower end of the extension 33 and the other end opening on the outer peripheral surface of the extension 33. In this embodiment, the extension 33 is provided with a plurality of suction holes 33a arranged at equal intervals in the circumferential direction around the axis O. As a result, as shown in FIG. 3, one ends of the plurality of suction holes 33a are arranged at equal intervals in the circumferential direction and open on the lower end surface of the extension 33. Note that, for convenience, only one suction hole 33a is indicated in FIG. 3.

[0032] 1, when suction holes 33a are provided in extension portion 33, suction paths 24 are provided in nozzle 20. Suction paths 24 are provided as annular grooves centered on axis O on the inner circumferential surface of clamping portion 23 of nozzle 20, and are configured to communicate with the other ends of the respective suction holes 33a when seal member 32 is in the closed position.

[0033] A negative pressure supply source 41 is connected to the suction path 24 via a pipe 40. The negative pressure supply source 41 is, for example, a vacuum pump. An on-off valve 42 is also provided in the pipe 40. The on-off valve 42 is, for example, an electromagnetic valve, and is controlled to open and close by control means (not shown). When the on-off valve 42 is opened, the negative pressure supply source 41 communicates with each suction hole 33a via the pipe 40 and the suction path 24, and negative pressure is supplied to the suction holes 33a.

[0034] The liquid filling apparatus 1 can also be configured to include a stretch rod 50. In this case, the stretch rod 50 is disposed at the axis of the drive rod 31 and the sealing member 32, i.e., the sealing body 30, and is movable back and forth relative to the sealing member 32. When liquid blow molding is performed by supplying pressurized liquid 3 to the object to be filled 2, the stretch rod 50 is moved so as to protrude downward from the sealing member 32, and the object to be filled 2 is stretched in the vertical direction by the stretch rod 50, thereby enabling the object to be filled 2 to be biaxially stretch-blow molded.

[0035] Next, a procedure for filling the object 2 with pressurized liquid 3 using the liquid filling device 1 to perform liquid blow molding will be described.

[0036] As shown in Figure 1, with the sealing member 32 in the closed position to close the supply port 21 and the on-off valve 42 closed, the object to be filled 2, which is the object to be filled with liquid 3, is placed in the mold 4 so that its mouth 2a is coaxial with the supply port 21.

[0037] 4, the main body block 10 is moved downward to fit the supply port 21 of the nozzle 20 into the mouth 2a of the object 2 to be filled. Next, with the on-off valve 42 closed, the drive rod 31 is operated to move the seal body 30 upward and the seal member 32 from the closed position to the open position. As a result, the abutment surface 32a separates from the seal surface 22, opening the supply port 21. The pressurized liquid 3 supplied to the nozzle 20 from the liquid supply unit 13 via the piping 12 and the liquid supply path 11 is then supplied from the supply port 21 through the mouth 2a and into the object 2 to be filled, thereby stretching the body 2b of the object 2 to be filled. If a stretching rod 50 is provided, the body 2b of the object 2 to be filled is stretched vertically by the stretching rod 50 as the stretching rod 50 moves downward. When the object to be filled 2 is filled with a predetermined amount of pressurized liquid 3, the object to be filled 2 is formed into a container of a predetermined shape, and filling of the object to be filled 2 with the liquid 3 is completed.

[0038] When filling of the object 2 with the liquid 3 is completed, as shown in FIG. 5, the negative pressure supply source 41 is activated and the on-off valve 42 is opened, and the drive rod 31 is operated to move the seal body 30 downward, moving the seal member 32 from the open position to the closed position. When the seal member 32 reaches the closed position, the abutment surface 32a abuts against the seal surface 22 over the entire circumference, closing the supply port 21 and stopping the filling of the object 2 with the pressurized liquid 3. The main body block 10 is then moved upward to separate the supply port 21 of the nozzle 20 from the mouth 2a of the object 2. Note that the negative pressure supply source 41 may be kept in operation at all times as long as it is activated when the on-off valve 42 is opened, or it may be set to start operating when the on-off valve 42 is opened.

[0039] After the seal member 32 is placed in the closed position and the supply port 21 is closed, there is a risk that the liquid 3 adhering to the tip surface of the supply port 21 or the tip surface of the extension 33 may drip, but because the on-off valve 42 is opened and negative pressure is supplied from the negative pressure supply source 41 to the multiple suction holes 33a opening in the tip surface of the extension 33, the liquid 3 adhering to the tip surface of the supply port 21 or the tip surface of the extension 33 is sucked through the multiple suction holes 33a. This prevents the liquid from dripping from the tip surface of the supply port 21 or the tip surface of the extension 33.

[0040] In the liquid filling device 1 of this embodiment, the sealing member 32 is made of synthetic resin. Therefore, when hot water is supplied to the liquid supply path 11 for cleaning or when a high-temperature liquid is filled into the object to be filled 2, if a high-temperature liquid 3 is supplied to the liquid supply path 11, the contact surface 32a of the sealing member 32 may be affected by the heat, and the sealing performance may be reduced.

[0041] In contrast to this, in the liquid filling device 1 of this embodiment, a gap 60 is provided between the support surface 31b of the drive rod 31 and the opposing surface 32b of the seal member 32, as shown in FIG.

[0042] The gap 60 is provided on the outside of the male thread portion 32c in the shape of a ring having a constant thickness and centered on the axis O. The gap 60 is set to be equal to or greater than the amount of elastic displacement in the vertical direction that occurs in the seal member 32 when the seal member 32 is held in the closed position with a specified load. By providing the gap 60 between the support surface 31b and the opposing surface 32b, the seal member 32 or the abutment surface 32a can elastically deform in a direction that narrows the gap 60 by the amount of the gap 60 when the seal member 32 is held in the closed position with a specified load applied from the drive rod 31.

[0043] In this way, by providing the gap 60 between the support surface 31b of the drive rod 31 and the opposing surface 32b of the seal member 32, even if the abutment surface 32a of the seal member 32 is affected by heat, the seal member 32, when held in the closed position by the specified load applied from the drive rod 31, further elastically deforms in the direction narrowing the gap 60, thereby ensuring close contact of the abutment surface 32a with the seal surface 22 and preventing liquid leakage. For example, even if the abutment surface 32a is deformed or distorted by heat, the seal member 32, when held in the closed position by the specified load applied from the drive rod 31, further elastically deforms in the direction narrowing the gap 60, thereby absorbing the deformation or distortion and ensuring close contact with the seal surface 22.

[0044] In this embodiment, the axial dimension of the male threaded portion 32c is set larger than the axial dimension of the screw hole 31c, and a gap 60 having a thickness corresponding to the difference in dimensions is provided between the support surface 31b and the opposing surface 32b.

[0045] According to this configuration, by screwing the male threaded portion 32c into the screw hole 31c with a specified torque until the tip surface (upper end surface) of the male threaded portion 32c abuts the bottom surface of the screw hole 31c, a gap 60 of a specified thickness can be easily and reliably formed between the support surface 31b and the opposing surface 32b.

[0046] As shown in FIG. 6, the axial dimension of the male threaded portion 32c may be set to be the same as the axial dimension of the screw hole 31c, and a spacer 61 of a predetermined thickness made of, for example, stainless steel may be placed between the tip surface (upper end surface) of the male threaded portion 32c and the bottom surface of the screw hole 31c, thereby providing a gap 60 of a thickness corresponding to the thickness of the spacer 61 between the support surface 31b and the opposing surface 32b.

[0047] According to this configuration, in contrast to the sealing member 32 and drive rod 31 of a conventional liquid filling device in which a gap 60 is not provided between the support surface 31b and the opposing surface 32b, by placing a spacer 61 between the tip surface of the male threaded portion 32c and the bottom surface of the screw hole 31c, it is possible to easily and low-costly provide a gap 60 between the support surface 31b and the opposing surface 32b while utilizing the conventional sealing member 32 and drive rod 31.

[0048] 7, a stopper portion 31d may be integrally formed on the outer periphery of support surface 31b. Stopper portion 31d is annular and surrounds the outer periphery of seal member 32, and its lower surface is a tapered surface that is offset upward in a step relative to contact surface 32a. There may be a radial gap between the inner periphery of stopper portion 31d and the outer periphery of seal member 32, or the inner periphery of stopper portion 31d and the outer periphery of seal member 32 may abut against each other.

[0049] According to this configuration, even if an excessive load is suddenly applied from the drive rod 31 to the sealing member 32, the stopper portion 31d abuts against the sealing surface 22, thereby preventing the sealing member 32 from being excessively elastically deformed and damaged.

[0050] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

[0051] For example, in the above embodiment, the liquid filling device 1 is shown as constituting a liquid blow molding device used for liquid blow molding, but the liquid filling device 1 is not limited to cases where blow molding and filling are performed simultaneously, and can also be used for filling a liquid that will become the content liquid inside a container that has been formed into a predetermined shape in advance by blow molding, injection molding, etc.

[0052] Furthermore, in the above embodiment, the gap 60 has a constant thickness, but this is not limited to this, and the thickness may not be constant as long as the sealing member 32 can be elastically deformed by the desired displacement amount.

[0053] Furthermore, in the above embodiment, the supply port 21 is configured as a cylinder extending downward from the inner peripheral edge of the sealing surface 22, but this is not limited to this, and the inner peripheral edge of the sealing surface 22 may be the supply port 21 without providing the cylindrical portion.

[0054] Furthermore, in the above embodiment, the support surface 31b of the drive rod 31 is provided with a threaded hole 31c as an engaged portion, the opposing surface 32b of the seal member 32 is provided with a male threaded portion 32c as an engaging portion, and the male threaded portion 32c is threadedly coupled to the threaded hole 31c to fix the seal member 32 to the drive rod 31, but this is not limiting, and a threaded hole as an engaging portion may be provided in the opposing surface 32b of the seal member 32, and a male threaded portion as an engaged portion that engages with the threaded hole may be provided in the support surface 31b of the drive rod 31. Furthermore, by using configurations other than the male threaded portion and the threaded hole as the engaging portion and the engaged portion, the seal member 32 may be fixed to the drive rod 31 by means other than threaded coupling. [Explanation of symbols]

[0055] 1 Liquid filling device 2 Filled object 2a Mouth 2b Torso 3 liquid 4. Mold 10 Body Block 11 Liquid supply path 12 Piping 13 Liquid supply section 14 Step surface 15 Support Block 20 nozzles 21 Supply port 22 sealing surface 23 Clamping part 24 Suction path 30 Seal body 31 Drive rod 31a Connection 31b Support surface 31c Screw hole (engaged part) 31d Stopper part 32 Sealing material 32a Contact surface 32b Opposite surface 32c Male thread (engagement part) 33 Extension 33a Suction hole 40 Piping 41 Negative pressure supply source 42 On-off valve 50 Extension Rod 60 Gap 61 Spacer O axis

Claims

1. A liquid filling device for filling a liquid into a filling object, a liquid supply unit that supplies liquid to the liquid supply channel; a nozzle including a supply port connected to the liquid supply channel and a sealing surface provided upstream of the supply port; a drive rod including a support surface facing the nozzle and an engaged portion provided on the support surface, the drive rod being disposed inside the liquid supply channel so as to be movable in a vertical direction; a sealing member made of synthetic resin, the sealing member having an abutment surface facing the sealing surface, an opposing surface facing the support surface, and an engaging portion provided on the opposing surface, the engaging portion engaging with the engaged portion and fixed to the drive rod, the sealing member moving together with the drive rod between a closed position where the abutment surface abuts against the sealing surface to close the supply port, and an open position where the abutment surface moves away from the sealing surface to open the supply port; A gap is provided between the support surface and the opposing surface, the engaging portion is a male thread portion protruding from the opposing surface, the engaged portion is a screw hole, A liquid filling device characterized in that the axial dimension of the engaging portion is set larger than the axial dimension of the engaged portion.

2. A liquid filling device for filling a liquid into a filling object, a liquid supply unit that supplies liquid to the liquid supply channel; a nozzle including a supply port connected to the liquid supply channel and a sealing surface provided upstream of the supply port; a drive rod including a support surface facing the nozzle and an engaged portion provided on the support surface, the drive rod being disposed inside the liquid supply channel so as to be movable in a vertical direction; a sealing member made of synthetic resin, the sealing member having an abutment surface facing the sealing surface, an opposing surface facing the support surface, and an engaging portion provided on the opposing surface, the engaging portion engaging with the engaged portion and fixed to the drive rod, the sealing member moving together with the drive rod between a closed position where the abutment surface abuts against the sealing surface to close the supply port, and an open position where the abutment surface moves away from the sealing surface to open the supply port; A gap is provided between the support surface and the opposing surface, the engaging portion is a male thread portion protruding from the opposing surface, the engaged portion is a screw hole, A liquid filling device characterized in that the axial dimension of the engaging portion is set to be the same as the axial dimension of the engaged portion, and a spacer member is arranged between the tip surface of the engaging portion and the bottom surface of the engaged portion.

3. 3. The liquid filling device according to claim 1, wherein the supply port is configured in a cylindrical shape extending downward from the inner circumferential edge of the sealing surface.

4. an extension portion integrally formed on a lower end of the seal member and disposed inside the supply opening when the seal member is in the closed position; a suction hole provided in the extension portion, the suction hole having one end opening at the lower end of the extension portion and the other end opening at the outer peripheral surface of the extension portion; a suction passage provided in the nozzle and communicating with the other end of the suction hole when the seal member is in the closed position; The liquid filling device according to claim 3 , further comprising: a negative pressure supply source connected to the suction path.

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