JP6467179B2 - Liquid filling nozzle - Google Patents

Description

  The present invention relates to an automatic liquid filling apparatus that fills a required container with various liquids such as fluid food, and a liquid filling nozzle provided in the automatic liquid filling apparatus.

  Conventionally, in a liquid-filled nozzle comprising a nozzle body and a valve mounted inside the nozzle body, a cylindrical valve seat in which the valve is fixed to the nozzle body, and an inner peripheral surface of the valve seat A liquid filling nozzle having a valve body slidably provided and a valve spring that biases the valve body is known (see Patent Document 1). However, when this liquid filling nozzle is used, the liquid discharged from the gap between the valve body and the valve seat at the start of filling wraps around the valve body, so that there is a part with a high flow velocity in the nozzle, especially When a rubber nozzle is used, it becomes an icicle and the liquid is not well organized, the roll-up at the bottom of the container increases, and the liquid may adhere to the nozzle. Even in the case of forced opening where the valve body is forcibly lowered and the check valve is opened, only the valve body moves, so only the liquid in the center of the nozzle is pushed out, creating a part with a high flow velocity, which may cause winding. . Also, to prevent dripping from the nozzle tip at the end of filling, the filling discharge valve needs to suck up a little amount of liquid and make the inside of the filling nozzle have a negative pressure. The valve body is lifted up while blocking the flow, and the liquid is sucked up. Since the outer diameter of the valve body is smaller than the inner diameter of the nozzle, a long suction stroke is required. As the stroke becomes longer, the suction time takes longer, and the amount of liquid leakage from between the valve body and the valve seat increases. As a result, the amount of suction becomes unstable, causing variations in liquid runout and dripping. Furthermore, since the amount of sucking up is reduced by the amount of the leaked liquid, a longer valve body sucking stroke to compensate for this is required. Further, since only the valve body portion is sucked up, the flow velocity in the nozzle is not uniform, and the liquid breakage becomes unstable. Furthermore, in the case of natural opening and closing, since the valve body does not begin to open unless the spring that has lifted the valve body excessively by hydraulic pressure is compressed by hydraulic pressure at the start of filling, the internal pressure of the piston rises and the check valve There was a problem that the liquid flowed out explosively at the moment of opening, bounced at the bottom of the container, and foamed.

  Further, as a discharge valve structure of a liquid filling nozzle, a valve structure in which a valve body and a valve seat move up and down has been known (see Patent Document 2), but the valve seat is not lifted by a spring and is free. When the pressure fluctuates during filling, the valve body and the valve seat move up and down together, causing dripping. In addition, since a large negative pressure is required in the piston, the upper check valve cannot be opened early as a countermeasure against cavitation. Further, the liquid stays in a slight gap on the sliding surface, and the cleaning property is poor, and clogging of the mesh due to cherning has been a problem when filling milk.

In addition, a vertical cylindrical nozzle body having a liquid inlet at the side with a lower end serving as a discharge port, a valve rod disposed concentrically in the nozzle body, and a lifting drive means for moving the valve rod up and down ,
An annular valve seat is formed in the inner peripheral portion between the discharge port and the liquid introduction port of the nozzle body, and a valve portion that can be tightly fitted to the annular valve seat from above at the lower portion of the valve rod, A throttle tube portion that protrudes concentrically downward from the valve portion and that is fitted with a small gap in the discharge pipe portion lower than the annular valve seat of the nozzle body when the valve is closed is provided. A concentric flow path with the lower end facing the discharge port and having a liquid passage hole communicating with the throttle passage at a plurality of locations on the outer peripheral surface, and an outer periphery lower than these liquid passage holes A seal ring that is in sliding contact with the inner peripheral surface of the discharge pipe portion of the nozzle body is fitted on the surface, the nozzle cylinder is released from the discharge pipe portion of the nozzle body, and the valve portion is the annular valve seat. Between the closed state of the nozzle closely fitted to the nozzle, the throttle tube portion is fitted into the discharge pipe portion of the nozzle body, and the valve portion There is known a liquid filling nozzle configured to reveal a nozzle throttle state in which liquid flowing out from between the annular valve seats is discharged through the flow passage hole of the throttle cylinder part and the throttle cylinder part (patent) Reference 3).

Japanese Utility Model Publication No. 2-28402 No. 6-3762 JP 2007-69928 A

  The problem of the present invention is that the liquid in the filling nozzle body is uniformly pushed out, and it is possible to reduce splashing and foaming at the bottom of the container at the start of filling, and stable liquid filling without causing dripping It is to provide a nozzle.

  The present inventors have intensively studied to solve the above problems, and have a structure in which the valve body and the valve seat for filling and discharging in the liquid filling nozzle move, and when the filling piston pushes out the liquid, the valve body and the valve seat are Liquid filling nozzle that can solve the above problems by lowering a certain amount, then only the valve body descends, the valve body rises at the end of filling, and then the valve body and the valve seat rise together As a result, the present invention was completed.

That is, this invention relates to what is specified by the invention specific matter shown below.
(1) a vertical cylindrical filling nozzle body 2 which is composed of a plurality of cylindrical members and which has a liquid discharge port (nozzle inlet port) 13 on the side with the lower end serving as a nozzle discharge port 8; A check valve 5 provided in an inner peripheral portion between the discharge port 8 and the liquid introduction port 13; and a valve opening / closing means for the check valve 5. The check valve 5 includes a valve body 35, The valve rod 30 extends upward from the central portion of the upper surface of the valve body 35, and the valve seat 34 disposed on the outer periphery of the upper portion of the valve body 35. The valve seat 34 projects inward from the cylindrical portion and its upper end portion. And the valve seat 34 is configured to have a cylindrical outer periphery sandwiched between the cylindrical members (22, 23). A cylindrical member (22, 23) in the ring 36 or below or above one of the cylindrical members (22, 23). Within a cylindrical outer peripheral ring provided together (22 _{36, 23} ³⁶⁾ and, vertically slidably provided in the check valve construction the valve element 35 and the valve seat 34 moves up and down 5 The valve opening / closing means of the check valve 5 is composed of a lowering means and a raising means for the valve body 35 and the valve seat 34. When the liquid is introduced from the liquid inlet 13 into the filling nozzle body 2, the valve body 35 And the valve seat 34 is lowered by a predetermined distance, after which only the valve body 35 is lowered and the check valve 5 is opened. At the end of filling, the valve body 35 is raised, and then the valve body 35 and the valve seat 34 are joined together. A liquid filling nozzle 2 characterized by having a structure that rises and closes the check valve 5.
(2) The lowering means of the valve body 35 is composed of the fluid pressure cylinder 7 provided with the piston rod 18 provided at the upper portion of the filling nozzle body 2, and the piston rod 18 provided in the fluid pressure cylinder 7 is moved forward. The liquid filling nozzle 2 according to the above (1), wherein the valve body 35 is lowered.
(3) The liquid filling nozzle 2 according to the above (1) or (2), wherein the raising means of the valve body 35 is a compression spring 20 that constantly biases the check valve 5 in a closing direction.
(4) The inner peripheral upper end portion of the cylindrical member 23 is in contact with the lower end portion of the valve seat 34 and serves as a lower stopper 38 for positioning the lower limit position, and the outer peripheral rings ( ₃₆ , 22 ₃₆ , 23 ³⁶ ). The above, wherein the lower surface of the inwardly projecting hook-shaped portion provided at the upper portion is in contact with the outer upper end portion of the valve seat 34 and serves as an upper stopper 37 for positioning the upper limit position ( The liquid filling nozzle 2 according to any one of 1) to (3).
(5) any tubular member (22, 23) to each other, above, wherein it is connected by a nut 25 via a peripheral ring _(36,22 36, ^{23 36)} (1) to (4) A liquid filling nozzle 2 according to claim 1.
(6) Any of (1) to (5) above, wherein a flow path forming groove through which a liquid flows is formed in a gap between the valve seat 34 and the outer ring ( ₃₆ , 22 ₃₆ , 23 ³⁶ ). A liquid filling nozzle 2 according to claim 1.
(7) The filling nozzle body 2 is formed by three first to third cylindrical members 21, 22, 23 from the upper side to the lower side, and the fluid pressure cylinder 7 is provided at the upper end of the first cylindrical member 21. The liquid inlet 13 is provided at the upper part of the second cylindrical member 22, and the nozzle outlet 8 is provided at the lower end of the third cylindrical member 23. The liquid filling nozzle 2 according to any one of the above.

(8) A liquid filling apparatus 1 comprising the liquid filling nozzle 2 according to any one of the above (1) to (7) and a metering cylinder 3 having a check valve 4.
(9) When the piston 9 in the metering cylinder 3 is advanced with the check valve 4 provided above the metering cylinder 3 closed, and a predetermined amount of filling liquid is introduced from the metering cylinder 3 into the filling nozzle body 2. At the same time, when the fluid pressure cylinder 7 is activated and the piston rod 18 is advanced, the valve body 35 is lowered from the standby position to the filling position via the valve rod 30, and the lowering operation of the valve rod 30 and the metering cylinder 3 The liquid filling apparatus 1 described in (8) above, wherein the valve seat 34 is also lowered from the upper limit position to the lower limit position by the liquid pressure of the supplied filling liquid.
(10) When the valve seat 34 is lowered from the upper limit position, between the upper surface of the valve seat 34 and the upper stopper 37, between the outer peripheral surface of the valve seat 34 and the flow path forming groove 39 of the outer peripheral rings ( ₃₆ , 22 ₃₆ , 23 ³⁶ ), In addition, a passage for the filling liquid is formed between the flow path forming recess 42 of the valve seat 34 and the lower stopper 38, and the liquid passes between the valve body 35 and the valve seat 34 when the container is filled with the liquid. In addition, the liquid filling apparatus 1 according to (9), wherein the passage is also configured to allow liquid to pass therethrough.
(11) The piston rod 18 of the fluid pressure cylinder 7 is retracted simultaneously with the advancement of the piston 9, and the valve rod 30 and the valve body 35 are raised from the filling position to the standby position by the urging force of the compression spring 20. At this time, the valve body 35 is configured to be lifted so as to contact the valve seat 34 and rise to a position where the check valve 5 is closed, and then continuously lift the valve seat 34 from the lower limit position to the upper limit position. The liquid filling apparatus 1 according to any one of the above (8) to (10), wherein
(12) The check valve 4 provided above the metering cylinder 3 has the same structure as the check valve 5 in the liquid filling nozzle 2 according to any one of the above (1) to (5). The liquid filling apparatus 1 according to any one of (8) to (10) above.
(13) A method for producing a filled packaging container, wherein the container is filled with a liquid using the liquid filling apparatus 1 according to any one of (8) to (12).

By using the liquid filling nozzle and the liquid filling apparatus of the present invention, the following effects are exhibited.
(1) At the start of filling, the valve body and the valve seat are lowered integrally, so that the liquid in the nozzle is uniformly pushed out and does not cause winding up at the bottom of the container.
(2) During the subsequent filling, even if the liquid flow rate is increased, the liquid initially accumulated at the bottom of the container serves as a cushion to reduce winding.
(3) Since the diameter of the valve seat is large at the time of liquid suction, the suction stroke can be reduced. As a result, the internal pressure of the piston is lowered, and the bounce at the bottom of the container at the start of filling is reduced and foaming is reduced.
(4) Since the suction stroke is small, the flow path is widened even if the valve descending distance is the same, the liquid flow rate is suppressed, and winding and foaming at the container bottom are reduced.
(5) Since the suction stroke is small, the suction time is shortened, the leakage between the valve body and the valve seat at the time of suction and the gap between the valve seat and the outer ring is reduced, and the liquid breakage is stabilized.
(6) Since the valve seat moves and sucks up the liquid in the entire nozzle, the sucking up is stable and the liquid breakage is stable.
(7) When the back is filled, the valve seat is fixed by the valve body pulled up by the spring, so that no dripping occurs even if the piston internal pressure fluctuates.

Moreover, the following effects are produced by the presence of a groove through which the liquid flows in the gap between the valve seat and the outer ring in order to improve cleaning performance and to prevent churning.
(8) The amount of liquid between the valve seat and the outer ring increases, and the sliding surface is washed away.
(9) Charging does not occur because the filling does not stay between the valve seat and the outer ring.
In addition, when the cylindrical outer ring is sandwiched between the cylindrical members, compared to the case where the cylindrical outer ring is integrally provided below or above one of the cylindrical members. In addition, it is easy to bake the elastic material at the portion where the upper end of the valve seat contacts the upper stopper, and the cylindrical member and the outer ring are independent of each other, so that it is easy to process and accurate. There are advantages such as.

In addition, the following effects are achieved by adopting a structure in which the movement of the valve body and the valve seat is controlled by an air cylinder or the like.
(10) By forcibly increasing the opening timing of the valve body, the hydraulic pressure and flow velocity at the start of filling are lowered, and splashing at the bottom of the container and foaming are reduced.
(11) Since the check valve opening can be made large by forcibly opening, the liquid flow rate during filling is suppressed, and there is little winding up and bubbling at the bottom of the container.
(12) At the end of filling, running out of liquid is stabilized by adjusting the check valve closing timing in accordance with the change in hydraulic pressure in the nozzle.

It is a longitudinal cross-sectional view of one Embodiment of the liquid filling apparatus of this invention. It is a longitudinal cross-sectional view of one Embodiment of the liquid filling nozzle of this invention by which a cylindrical outer periphery ring is clamped between cylindrical members. FIG. 3 is an enlarged view of a main part near a check valve (when closed) in FIG. 2. FIG. 3 is an enlarged view of a main part near a check valve (when opened) in FIG. 2. It is a cross-sectional view in the AA line in FIG. It is a principal part enlarged view of the non-return valve (at the time of closure) vicinity of the liquid filling nozzle of this invention by which the cylindrical outer periphery ring is integrally provided under the cylindrical member. It is a principal part enlarged view of the non-return valve (at the time of closure) vicinity of the liquid filling nozzle of this invention in which the cylindrical outer periphery ring is integrally provided above the cylindrical member.

  The liquid filling nozzle of the present invention is composed of a plurality of cylindrical members, a vertical cylindrical filling nozzle body having a liquid inlet (nozzle inlet port) on the side with the lower end as a nozzle discharge port; and the filling nozzle body A check valve provided in an inner peripheral portion between the nozzle discharge port and the liquid introduction port; and a valve opening / closing means for the check valve, the check valve comprising: a valve body; Consists of a valve stem extending upward from the center of the upper surface and a valve seat disposed on the upper outer periphery of the valve body. The valve seat is composed of a cylindrical part and a hook-like part projecting inwardly from the upper end thereof, and has a bowl shape The lower surface of the portion is configured to be in close contact with the upper surface of the valve body, and the valve seat is in a cylindrical outer ring sandwiched between the cylindrical members, or below or above one of the cylindrical members In a cylindrical outer ring which is provided integrally with the cylindrical member. A check valve having a structure in which the valve body and the valve seat move up and down, and the valve opening and closing means of the check valve comprises a valve body and a lowering means and a raising means for the valve seat, When the liquid is introduced into the valve body, the valve body and the valve seat are lowered by a predetermined distance, after that, only the valve body is lowered and the check valve is opened. Are not particularly limited as long as the nozzles have a structure that rises together and closes the check valve, and the liquid filling apparatus of the present invention includes a metering cylinder having the liquid filling nozzle of the present invention and the check valve. If it is an apparatus, it will not restrict | limit in particular, If it is a method of filling a container with a liquid using the liquid filling apparatus of this invention, it will not restrict | limit especially as a manufacturing method of the filling packaging container of this invention.

  Examples of the means for lowering the valve body include a fluid pressure cylinder provided with a piston rod provided at the upper portion of the filling nozzle main body, and the valve body is moved forward and backward by the piston rod provided in the fluid pressure cylinder. Can be lowered or raised. This type of descending means is suitable for the case of a rubber nozzle specification in which the shape of the nozzle outlet is a cross-shaped slit. In the case where the shape of the nozzle discharge port is a mesh nozzle specification, the fluid flow pressure flowing from the liquid inlet (nozzle inlet port) can be used as the valve body lowering means. Further, as a means for lowering the valve seat, the fluid pressure of the liquid flowing in from the liquid inlet (nozzle inlet port) can be used.

  As a means for raising the valve body, a piston rod provided at the upper part of the filling nozzle body is provided in addition to a compression spring which is usually disposed above the check valve and constantly biases the check valve in a closing direction. A fluid pressure cylinder can be mentioned, and the valve body can be forcibly pulled up by a retreating operation of a piston rod provided in the fluid pressure cylinder. The valve seat lifting means may include the valve body lifting means, and the valve seat is lifted by the valve body rising.

  Moreover, the inner peripheral upper end part of the said cylindrical member contact | abuts with the lower end part of a valve seat, it is a lower stopper which positions the lower limit position, and the collar protruded inward provided in the outer peripheral ring upper part The bottom surface of the cylindrical part abuts the outer upper end of the valve seat and serves as an upper stopper for positioning the upper limit position. The two cylindrical members are connected by a nut via the outer ring. The liquid filling nozzle, the liquid filling nozzle in which a flow passage forming groove for flowing a liquid is formed in the gap between the valve seat and the outer ring, and the filling nozzle main body have three first to It is formed by three cylindrical members, a fluid pressure cylinder is provided at the upper end of the first cylindrical member, a liquid inlet is provided at the upper portion of the second cylindrical member, and a lower end of the third cylindrical member is provided at the lower end. Liquid filling nozzle with nozzle outlet It can be preferably exemplified Le.

  As the liquid filling device of the present invention, the piston in the metering cylinder is advanced with the check valve provided above the metering cylinder closed, and at the same time a predetermined amount of filling liquid is introduced from the metering cylinder into the filling nozzle body. When the fluid pressure cylinder is activated and the piston rod advances, the valve body is lowered from the standby position to the filling position via the valve rod, and the valve rod is lowered and the filling liquid sent from the metering cylinder is Liquid filling device configured to lower the valve seat from the upper limit position to the lower limit position due to hydraulic pressure, or between the valve seat upper surface and the upper stopper, the valve seat outer peripheral surface and the outer periphery when the valve seat descends from the upper limit position A passage for the filling liquid is formed between the flow path forming groove of the ring and between the flow path forming recess of the valve seat and the lower stopper, and when the liquid is filled into the container, the liquid flows between the valve body and the valve seat. In addition to passing through, the passage is also liquid There can be preferably exemplified a liquid filling apparatus is configured to pass.

  Furthermore, the piston rod of the fluid pressure cylinder is retracted at the same time as the advancement of the piston is stopped, and the valve rod and the valve body are raised from the filling position to the standby position by the urging force of the compression spring. Above the liquid filling device or the metering cylinder, which is configured to rise so as to raise the valve seat continuously from the lower limit position to the upper limit position. A liquid filling apparatus in which the check valve provided has the same structure as the check valve in the liquid filling nozzle can also be suitably exemplified.

Hereinafter, the aspect by which the cylindrical outer periphery ring of the liquid filling nozzle of this invention or a liquid filling apparatus is clamped between cylindrical members is demonstrated along FIGS.
The liquid filling apparatus 1 includes a filling nozzle body 2 that fills a container (not shown) with a liquid, and a metering cylinder 3 that sends the liquid to the filling nozzle body 2.

  An elastomer nozzle discharge port 8 is provided in the lower portion of the filling nozzle body 2. The nozzle discharge port 8 is provided with a cross-shaped slit at the lower end thereof, and the slit is opened and closed by the hydraulic pressure inside the filling nozzle body 2. A liquid inlet (nozzle inlet port) 13 is provided in the middle of the height of the filling nozzle body 2. A lower check valve 5 is provided between the nozzle inlet port 13 and the nozzle discharge port 8 of the filling nozzle body 2. A lower fluid pressure cylinder 7 having a lower piston rod 18 is provided on the upper portion of the filling nozzle body 2. A lower compression spring 20 is provided above the nozzle inlet port 13 of the filling nozzle body 2, and the lower check valve 5 is always urged in the closing direction (upward) by the lower compression spring 20. The lower check valve 5 can be opened and closed against the urging force of the lower compression spring 20 by the forward and backward movement of the lower piston rod 18 provided in the lower fluid pressure cylinder 7.

  A piston 9 is provided inside the metering cylinder 3. The piston 9 reciprocates left and right by driving means (not shown). By using, for example, a servo motor as the driving means, it is possible to arbitrarily set the operation speed and the operation amount of the piston 9. The metering cylinder 3 is provided with a cylinder inlet port 14 at the top and a cylinder outlet port 15 at the bottom. The cylinder outlet port 15 is connected to the nozzle inlet port 13 by the lower connecting pipe 11.

  An upper connecting pipe 10 is connected above the cylinder inlet port 14. An upper connection pipe inlet port 16 is provided in the middle of the height of the upper connection pipe 10. An upper check valve 4 is provided near the cylinder inlet port 14 of the upper connecting pipe 10. An upper fluid pressure cylinder 6 having an upper piston rod 17 is provided at the upper part of the upper connection pipe 10. An upper compression spring 19 is provided above the upper connection pipe inlet port 16 of the upper connection pipe 10, and the upper check valve 4 is always urged in the closing direction by the upper compression spring 19. The upper check valve 4 can be opened and closed against the urging force of the upper compression spring 19 by the forward and backward movement of the upper piston rod 17 provided in the upper fluid pressure cylinder 6. The upper connection pipe inlet port 16 is connected by a supply pipe 12 to a filling liquid tank (not shown).

  By moving the piston 9 to the left and opening the upper check valve 4 and closing the lower check valve 5, the liquid in the filling liquid tank is fed into the metering cylinder 3, and then the piston 9 is moved to the right. By closing the upper check valve 4 and opening the lower check valve 5, the liquid in the metering cylinder 3 is fed into the filling nozzle body 2 and the container is filled with the liquid.

  The filling nozzle body 2 is formed by three first to third cylindrical members 21, 22, 23 from the upper side to the lower side. A lower fluid pressure cylinder 7 is provided at the upper end of the first cylindrical member 21, a nozzle inlet port 13 is provided at the upper portion of the second cylindrical member 22, and a nozzle discharge port is provided at the lower end of the third cylindrical member 23. 8 is provided.

  A lower check valve 5 is provided at a connection portion between the second cylindrical member 22 and the third cylindrical member 23. The lower check valve 5 includes a substantially downward conical valve body 35, a valve rod 30 extending upward from the center of the upper surface of the valve body 35, and a valve seat 34 disposed on the upper outer periphery of the valve body 35. Yes. The valve seat 34 includes a cylindrical portion and a hook-like portion protruding inward from the upper end portion thereof, and the lower surface of the hook-like portion is in close contact with the upper surface of the valve body 35. The valve seat 34 is provided with arms 32 extending upward and inward from a plurality of positions on the upper surface of the bowl-shaped portion, and a cylindrical valve rod guide 31 for guiding the valve rod 30 is provided at the center of the arm. The second cylindrical member 22 and the third cylindrical member 23 are connected by a second nut 25 via a cylindrical outer ring 36. The valve seat 34 of the lower check valve 5 is provided in the outer ring 36 so as to be slidable up and down.

  The first tubular member 21 and the second tubular member 22 are connected by a first nut 24 via a bottomed tubular spring receiver 27. The upper end of the valve rod 30 is connected to the lower end of the connecting rod 29 so that the connection can be released. The connecting rod 29 extends from the middle of the height of the second cylindrical member 22 to the top of the first cylindrical member 21, and the upper end surface of the connecting rod 29 has a predetermined distance from the lower end surface of the lower piston rod 18 of the lower fluid pressure cylinder 7. It is made to be relative. A cylindrical connecting rod guide 33 extending upward is provided at the center of the bottom of the spring receiver 27. A hook-shaped spring retainer 26 is fixed to the upper portion of the connecting rod 29. A lower compression spring 20 is provided between the spring retainer 26 and the spring receiver 27, whereby the connecting rod 29 is always urged upward. A bellows 28 is provided between the lower surface of the spring receiver 27 and the lower portion of the connecting rod 29, and the first cylindrical member 21 and the second cylindrical member 22 are blocked from passing liquid.

  The inner peripheral upper end of the third cylindrical member 23 is in contact with the lower end of the valve seat 34 and serves as a lower stopper 38 for positioning the lower limit position. A hook-like portion protruding inward is provided on the outer peripheral ring 36. An elastic material is baked on the outer surface of the bowl-shaped portion of the outer ring 36. The lower surface of the bowl-shaped portion of the outer peripheral ring 36 on which the elastic material is baked is in contact with the outer upper end portion of the valve seat 34 and serves as an upper stopper 37 for positioning the upper limit position. The valve seat 34 is disposed so as to be movable up and down by a distance C between the upper stopper 37 and the lower stopper 38. The lower end on the inner side of the second cylindrical member 22 and the upper end of the outer ring 36 are in liquid-tight contact with an elastic material that has been baked. An elastic seal member is provided between the upper end portion of the third cylindrical member 23 and the lower end portion of the outer peripheral ring 36, and the space between the upper end portion of the third cylindrical member 23 and the lower end portion of the outer peripheral ring 36 is held in a liquid-tight manner. Yes.

  On the inner peripheral surface of the outer peripheral ring 36, flow path forming grooves 39 and guide protrusions 40 are formed at six locations from the middle to the lower end of the height. The inner circumferential surface of the guide protrusion 40 is in contact with the outer circumferential surface of the valve seat 34 and can guide the vertical movement thereof. At the lower end of the valve seat 34, six positioning convex portions 41 are provided for positioning the valve seat 34 at the lower limit position by contacting the lower stopper 38. Between the adjacent positioning convex portions 41 at the lower end of the valve seat 34, a flow path forming concave portion 42 is provided. The positioning convex portion 41 is provided at a position facing the guide protrusion 40.

  When the piston 9 in the metering cylinder 3 is moved rightward with the upper check valve 4 closed, a predetermined amount of filling liquid is sent from the metering cylinder 3 into the filling nozzle body 2. At the same time, the lower fluid pressure cylinder 7 operates and the lower piston rod 18 advances, so that the valve body 35 is moved from the standby position (FIG. 3) to the filling position (FIG. 4) via the connecting rod 29 and the valve rod 30. Descend. At this time, the valve seat 34 is also lowered from the upper limit position (FIG. 3) to the lower limit position (FIG. 4) by the lowering operation of the valve rod 30 and the hydraulic pressure of the filling liquid sent from the metering cylinder 3. When the valve seat 34 is lowered from the upper limit position, between the upper surface of the valve seat 34 and the upper stopper 37, between the outer peripheral surface of the valve seat 34 and the flow path forming groove 39 of the outer peripheral ring 36, and the flow path forming recess 42 of the valve seat 34 A passage for filling liquid is formed between the lower stoppers 38. When filling the container with the liquid, in addition to the liquid passing between the valve body 35 and the valve seat 34, the liquid also passes through the passage.

  When the advancing operation (right movement) of the piston 9 is stopped, the filling liquid is not sent from the metering cylinder 3 into the filling nozzle body 2. At the same time, the lower piston rod 18 of the lower fluid pressure cylinder 7 is retracted, and the connecting rod 29, the valve rod 30, and the valve body 35 are moved from the filling position (FIG. 4) to the standby position (FIG. 4) by the urging force of the lower compression spring 20. Ascend to Fig. 3). At this time, after the valve body 35 is brought into contact with the valve seat 34 and rises to a position where the lower check valve 5 is closed, the valve seat 34 is further raised so as to raise the valve seat 34 from the lower limit position to the upper limit position.

  The other structure and operation of the upper fluid pressure cylinder 6 for opening and closing the upper check valve 4 can be the same as the other structure and operation of the lower fluid pressure cylinder 7 for opening and closing the lower check valve 5.

Next, in FIG. 6, the embodiment comprises an outer ring 22 ₃₆ cylindrical provided together below the tubular member 22, also in FIG. 7, integral to the upper tubular member 23 and is in embodiments having a cylindrical outer peripheral ring 23 ³⁶ which is provided, (when closed) check valve 5 of the liquid filling nozzle of the present invention is shown. In the check valve 5 of these modes, the upper stopper 37 is provided on the cylindrical member 22, and the lower stopper 38 is provided on the cylindrical member 23.

  The liquid filling nozzle and the liquid filling apparatus of the present invention are used in the field of filling and packaging.

DESCRIPTION OF SYMBOLS 1 Liquid filling apparatus 2 Filling nozzle main body 3 Metering cylinder 4 Upper check valve 5 Lower check valve 6 Upper fluid pressure cylinder 7 Lower fluid pressure cylinder 8 Filling nozzle 9 Piston 10 Upper connection pipe 11 Lower connection pipe 12 Supply pipe 13 Nozzle inlet Port 14 Cylinder inlet port 15 Cylinder outlet port 16 Upper connecting pipe inlet port 17 Upper piston rod 18 Lower piston rod 19 Upper compression spring 20 Lower compression spring 21 First cylindrical member 22 Second cylindrical member 22 ₃₆ Second cylindrical member The outer ring 23 provided integrally below the third cylindrical member 23 ³⁶ The outer ring 24 provided integrally above the third cylindrical member 24 First nut 25 Second nut 26 Spring retainer 27 Spring receiver 28 Bellows 29 Connecting rod 30 Valve rod 31 Valve rod guide 32 Arm 33 Connecting rod guide 34 Valve seat 35 Valve body 36 Same as tubular member Peripheral ring 37 on the stopper 38 below the stopper 39 the passage forming grooves is sandwiched 40 guide projecting 41 positioning protrusion 42 passage forming recess 43 an elastic sealing member

Claims (13)

A vertical cylindrical filling nozzle body comprising a plurality of cylindrical members and having a liquid inlet at the side with the lower end serving as a nozzle outlet; an inner circumference between the nozzle outlet and the liquid inlet of the filling nozzle body A check valve provided in the section; and valve opening and closing means of the check valve;
The check valve is composed of a valve body, a valve rod extending upward from the center of the upper surface of the valve body, and a valve seat disposed on the upper outer periphery of the valve body. The valve seat is formed from a cylindrical portion and an upper end portion thereof. It is composed of a hook-shaped part protruding inward, and is configured such that the lower surface of the hook-shaped part is in close contact with the upper surface of the valve body, and the valve seat is in a cylindrical outer ring held between the cylindrical members. Or in a cylindrical outer ring integrally provided with the cylindrical member below or above one of the cylindrical members, and is provided slidably up and down, and the valve body and the valve seat are vertically A check valve with a moving structure,
The valve opening and closing means of the check valve comprises a valve body and a valve seat lowering means and a lifting means, and when the liquid is introduced from the liquid introduction port into the filling nozzle body, the valve body and the valve seat are lowered by a predetermined distance. opens the check valve is lowered only valve body, at the filling end of the valve body is raised, after which valve body and the valve seat have a structure of closing the check valve to rise together,
A liquid filling nozzle, wherein a valve seat is fixed by a valve body pulled up at the time of back filling .   The lowering means of the valve body is composed of a fluid pressure cylinder provided with a piston rod provided at the upper part of the filling nozzle body, and the valve body is lowered by the advancing operation of the piston rod provided in the fluid pressure cylinder. The liquid filling nozzle according to claim 1.   The liquid filling nozzle according to claim 1 or 2, wherein the valve body raising means is a compression spring that constantly biases the check valve in a closing direction.   The upper end of the inner periphery of the cylindrical member is in contact with the lower end of the valve seat and serves as a lower stopper for positioning the lower limit position of the flange-shaped portion protruding inward provided on the upper portion of the outer ring. The liquid filling nozzle according to any one of claims 1 to 3, wherein the lower surface serves as an upper stopper that abuts the outer upper end of the valve seat and positions the upper limit position thereof.   The liquid filling nozzle according to claim 1, wherein the cylindrical members are connected to each other by a nut via an outer peripheral ring. When the valve seat is lowered from the upper limit position , the filling liquid is placed between the upper surface of the valve seat and the upper stopper, between the outer peripheral surface of the valve seat and the flow path forming groove of the outer ring , and between the flow path forming recess of the valve seat and the lower stopper. The liquid filling nozzle according to claim 1, wherein a passage is formed.   The filling nozzle body is formed by three first to third cylindrical members from the upper side to the lower side, a fluid pressure cylinder is provided at the upper end of the first cylindrical member, and an upper part of the second cylindrical member. The liquid filling nozzle according to claim 1, wherein a liquid introduction port is provided, and a nozzle discharge port is provided at a lower end of the third cylindrical member.   A liquid filling apparatus comprising the liquid filling nozzle according to claim 1 and a metering cylinder having a check valve.   With the check valve provided above the metering cylinder closed, the piston in the metering cylinder is advanced to introduce a predetermined amount of filling liquid from the metering cylinder into the filling nozzle body. When the piston rod advances, the valve body is lowered from the standby position to the filling position via the valve rod, and the valve seat is also set to the upper limit by the lowering operation of the valve rod and the liquid pressure of the filling liquid sent from the metering cylinder. The liquid filling apparatus according to claim 8, wherein the liquid filling apparatus is configured to descend from a position to a lower limit position.   When the valve seat is lowered from the upper limit position, the filling liquid is placed between the upper surface of the valve seat and the upper stopper, between the outer peripheral surface of the valve seat and the flow path forming groove of the outer ring, and between the flow path forming recess of the valve seat and the lower stopper. The passage is formed, and when the liquid is filled into the container, in addition to the liquid passing between the valve body and the valve seat, the passage is also configured to pass the liquid. The liquid filling apparatus according to 9.   The piston rod of the fluid pressure cylinder is retracted at the same time as the advancement of the piston stops, and the valve rod and the valve body are raised from the filling position to the standby position by the urging force of the compression spring. 11. The structure according to claim 8, wherein the valve seat is continuously lifted so as to be lifted from the lower limit position to the upper limit position after being raised to a position where the check valve is closed in contact. Or a liquid filling apparatus according to any one of the above.   The check valve provided above the metering cylinder has the same structure as the check valve in the liquid filling nozzle according to any one of claims 1 to 5. Liquid filling device.   A method for producing a filled packaging container, wherein the container is filled with a liquid using the liquid filling apparatus according to claim 8.