JP2007069928A - Liquid filling nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid filling nozzle with a valve built therein which can reliably prevents liquid scattering when stopping the discharge by closing the valve, is simple in structure, can be manufactured at low cost, and is superior in cleaning property by communication of a cleaning liquid, working reliability, durability, etc. <P>SOLUTION: In the liquid filling nozzle, a lower end of a throttling cylindrical part 22 faces a discharging port 1a and has an opening 23a with its inner side as a throttling flow passage 23. The nozzle has a plurality of liquid passing holes 24 communicated with the throttling flow passage 23 in a plurality of positions of an outer circumferential surface. A seal ring 7 slidably brought into contact with an inner circumferential surface of a discharge pipe part 12b is fitted to an outer circumferential surface below the liquid passing holes 24. The throttling cylindrical part 22 is fitted in the discharging pipe part 12b between the nozzle opening state in which the throttling cylindrical part 22 is detached from the discharging pipe part 12b and the nozzle closing state in which a valve part 6 is tightly fitted to an annular valve seat 5 through the nozzle throttled state in which the liquid L flowing between the valve part 6 and the annular valve seat 5 is discharged through the liquid passing holes 24 of the throttling cylindrical part 22 and the throttling flow passage 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a valve-filled type liquid filling nozzle used in an automatic liquid filling apparatus or the like for filling various liquids in a required container, and more particularly to the liquid filling nozzle that discharges by a liquid pressure applied to an introduced liquid from a supply source. .

  In an automatic liquid filling apparatus, when a liquid with a substantially constant pressure is introduced from a liquid tank or a pressurized tank installed at a high place and the liquid is filled into a required container using the liquid pressure, A liquid-filled nozzle with a built-in valve that switches between discharge and stop by opening and closing a valve provided therein is generally used. Thus, the valve-filled type liquid-filling nozzle has a valve rod concentrically arranged in a vertical cylindrical nozzle body having a discharge port at the lower end, and the valve opening / closing cylinder mounted on the nozzle body causes the valve to open. By raising and lowering the rod, the valve portion of the valve rod opens and closes by contacting and disconnecting the annular valve seat on the inner periphery of the nozzle body.

  However, in such a liquid filling nozzle, a substantially constant liquid pressure is always applied to the internal liquid, so that when the discharge is stopped by closing the valve, the flow gap of the valve portion is rapidly narrowed. Along with this, the flow velocity of the liquid passing through the flow gap is remarkably increased, and the liquid ejected vigorously from the narrow gap is scattered so as to interfere with each other and spread from the discharge port to the periphery. In addition to being contaminated, there is a problem that the liquid filled in the container is bubbled to cause air entrainment.

Therefore, various liquid filling nozzles having a throttle valve upstream of the original on-off valve responsible for discharging / stopping the nozzle have been proposed as means for preventing the scattering when the discharge is stopped as described above (Patent Document 1). ~ 4). However, the liquid filling nozzles according to these proposals all have a complicated structure due to the provision of the throttle valve mechanism, and the manufacturing cost is high, and the cleaning performance by the flow of the cleaning liquid, the operation reliability of the throttle valve mechanism, There were difficulties in terms of durability.
Japanese Patent Laid-Open No. 4-201801 No. 7-2479 Japanese Patent No. 291202 Japanese Patent Publication No. 2003-237895

  In view of the above-mentioned situation, the present invention can reliably prevent liquid scattering at the time of discharge stop due to valve closing as a liquid-filled nozzle with a built-in valve, and can be manufactured at low cost because it is structurally simple. It aims at providing what is excellent also in terms of detergency, operational reliability, durability, and the like due to circulation of the cleaning liquid.

  In order to achieve the above object, a liquid filling nozzle according to claim 1 of the present invention is a vertical cylinder type having a lower end as a discharge port 1a and a liquid introduction port 1b on the side as shown by the reference numerals in the drawings. Nozzle body 1, a valve rod 2 disposed concentrically in the nozzle body 1, and a lift drive means (two-stage air cylinder 3) for moving the valve rod 2 up and down. An annular valve seat 5 is formed in the inner peripheral portion between the discharge port 1a and the liquid introduction port 1b, and a valve portion 6 that can be tightly fitted to the lower portion of the valve stem 2 with respect to the annular valve seat 5 from above. And a throttle tube portion 22 that protrudes concentrically below the valve portion 6 and fits into the discharge pipe portion 12b below the annular valve seat 5 of the nozzle body 1 with a small gap t when the valve is closed. The throttle tube portion 22 is concentrically arranged with the throttle channel 23 on the inside and the lower end facing the discharge port 1a. The opening 23a has liquid passage holes 24 communicating with the throttle channel 23 at a plurality of locations on the outer peripheral surface, and the discharge pipe portion 12b of the nozzle body 1 is formed on the outer peripheral surface lower than the liquid passage holes 24. A seal ring 7 slidably in contact with the inner peripheral surface is fitted, the nozzle cylinder 22 is detached from the discharge pipe portion 12b of the nozzle body 1, and the valve portion 6 is closely fitted to the annular valve seat 5. Between the nozzle closed state, the throttle tube portion 22 is fitted into the discharge pipe portion 12 b of the nozzle body 1, and the liquid L flowing out between the valve portion 6 and the annular valve seat 5 passes through the throttle tube portion 22. The nozzle throttle state discharged through the liquid hole 24 and the throttle channel 23 is revealed.

  According to a second aspect of the present invention, in the liquid filling nozzle according to the first aspect, the elevating drive means is composed of a two-stage fluid pressure cylinder (two-stage air cylinder 3) attached on the nozzle body 1.

  According to a third aspect of the present invention, in the liquid filling nozzle of the first or second aspect, the liquid introduction port 1b is connected to a liquid tank T or a pressurized tank installed at a high place, and the introduced liquid L is subjected to potential energy or application. It is set as the structure which the hydraulic pressure by pressure adds.

  According to a fourth aspect of the present invention, in the liquid filling nozzle according to any one of the first to third aspects, the throttle tube portion 22 includes an independent member that is screwed onto the rod 21 of the valve rod 2, and the throttle tube portion 22 and the The elastic ring material 25 having the valve portion 6 is sandwiched between the rod 21 and the rod 21.

  According to the liquid filling nozzle of the first aspect of the invention, the throttle tube part is detached from the discharge pipe part of the nozzle body when the nozzle is open, and the liquid flowing in from the liquid inlet is opened by the supply liquid pressure. It flows into the discharge pipe part from between the valve part and the annular valve seat, and is discharged downward with a full flow from the discharge port at the lower end, but part of the flow to the discharge pipe part is a liquid passage hole in the throttle tube part And passing through the throttle channel. In the process of closing the valve to stop the discharge, first, the distance between the valve seat and the throttle cylinder part is reduced as the valve rod descends, but the inlet side of the throttle channel of the throttle cylinder part does not change. Therefore, the ratio of the flow passing through the throttle channel in the flow to the discharge pipe portion increases, and the discharge from the discharge port weakens in the peripheral portion and becomes stronger and stronger in the central portion. Next, when the throttle tube portion is fitted into the discharge pipe portion and the seal ring on the outer peripheral surface is slidably contacted with the inner peripheral surface of the discharge pipe portion, the flow toward the discharge port along the inner peripheral surface of the discharge pipe portion is interrupted. However, only the central flow that passes through the throttle channel of the throttle cylinder part is discharged, and the thin liquid flow that exits from the lower end opening is discharged as it is without being disturbed, and this discharge liquid flow is discharged to the annular valve seat of the valve part. It stops finely in the process of contact and closing from approach. Therefore, in this liquid filling nozzle, the liquid does not scatter from the discharge port to the periphery when the valve is closed, so that contamination of the container and peripheral devices due to the splatter can be avoided, and air entrainment due to the foaming of the liquid in the container can also be prevented. Furthermore, this liquid filling nozzle is cleaned by flowing the cleaning liquid into the valve opening state when the line is cleaned, so that all the wetted parts are touched and cleaned without leaving all of the liquid contact parts. There is an advantage that the structure is simple and can be manufactured at low cost, and the operation reliability and durability are excellent.

  According to the second aspect of the present invention, since the lifting / lowering operation of the valve rod can be set in two stages by the two-stage fluid pressure cylinder, the nozzle throttle state is changed to the nozzle closed state according to the filling conditions such as the liquid properties and the filling speed. The speed to reach can be adjusted, and the filling amount can be set with higher accuracy.

  According to the third aspect of the present invention, although the hydraulic pressure is applied to the introduced liquid and the scattering is likely to occur when the valve is closed, the scattering can be reliably prevented.

  According to the invention of claim 4, since the valve rod has a structure in which the elastic ring material having the valve portion is sandwiched between the rod, which is an independent member, and the throttle tube portion, the assembly of the valve rod is easy. In addition, replacement work due to wear of the elastic ring material of the valve portion is facilitated.

  Hereinafter, an embodiment of a liquid filling nozzle according to the present invention will be specifically described with reference to FIGS.

  As shown in FIG. 1, the liquid filling nozzle includes a vertical cylindrical nozzle body 1 having a lower end as a discharge port 1a and a liquid introduction port 1b on the side, and a valve rod disposed concentrically in the nozzle body 1. 2 and a two-stage air cylinder 3 mounted on the nozzle body 1. The telescopic rod 3a projecting downward from the air cylinder 3 and the upper end 2a projecting upward from the nozzle body 1 of the valve rod 2 are connected, and the valve rod 2 moves up and down by driving the air cylinder 3. It is supposed to work.

  The nozzle body 1 includes a cheese pipe 10 in which a straight pipe portion 10a is arranged vertically, and a stepped pipe 11 concentrically connected to the lower end of the straight pipe portion 10a via a clamp band 4. The cheese pipe 10 has a branch pipe portion 10 b protruding sideways as a liquid inlet 1 b, and a liquid inlet pipe P from a liquid tank T provided at a high place in the branch pipe portion 10 b communicates via a clamp band 4. Also connected to the upper end of the straight pipe portion 10a is an end plate member 12 through which the rod 21 of the valve rod 2 penetrates in a fluid-tight manner so as to be slidable. In addition, the connection part by the clamp band 4 of these three places is flange joining which pinched | interposed the gasket (illustration omitted).

  The stepped tube 11 has an upper valve stem guide tube portion 11a having the same inner diameter as the straight tube portion 10a of the cheese tube 10, and a lower discharge tube portion 11b having a small inner diameter and having a lower end as the discharge port 1a. The inner peripheral portion that transitions from the large inner diameter valve rod guide tube portion 11a to the smaller inner diameter discharge pipe portion 11b forms an annular tapered surface, and the lower side of the annular tapered surface constitutes the annular valve seat 5. . Further, as shown in FIG. 2, guide protrusions 13 are formed on the inner periphery of the valve rod guide tube portion 11a along the vertical direction at a plurality of circumferential locations (four locations in the figure).

  The valve rod 2 is provided with a valve portion 6 having an annular tapered surface that is reduced in diameter downward, and a throttle tube portion 22 that protrudes concentrically downward from the valve portion 6 at the lower end portion of a round rod 21. The valve portion 6 is tightly fitted to the annular valve seat 5 from above and is closed, and the throttle tube portion 22 is fitted into the discharge pipe portion 11b of the nozzle body 1 with a small gap t when the valve is closed. Is configured to do. Thus, the throttle tube portion 22 has a throttle channel 23 on the inside and a lower end facing the discharge port 1a of the nozzle body 1 to open concentrically, and as shown in FIG. The discharge pipe portion 11b of the nozzle body 1 is provided on the outer peripheral surface at a lower position than the liquid passage holes 24. A seal ring 7 made of fluororubber is slidably in contact with the inner peripheral surface.

  As shown in FIG. 4, the throttle tube portion 22 of the valve rod 2 is configured by an independent member separate from the rod 21, and the bolt portion 22 a protruding from the center of the upper surface is connected to the center of the lower end surface of the rod 21. The rod 21 is concentrically connected to the rod 21 by being screwed into the screw hole 21a. The valve portion 6 is provided on the outer peripheral portion of the lower edge of the elastic ring material 25 made of fluoro rubber. The elastic ring material 25 is externally fitted to the small diameter lower portion 21 b of the rod 21, and the annular step of the rod 21 is performed. It is configured to be sandwiched between the portion 21c and the outer peripheral portion of the upper end surface of the aperture cylinder portion 22. Further, the seal ring 7 is fitted to the male screw portion 22c on the outer periphery of the lower portion of the throttle cylinder portion 22 in a state where the seal ring 7 is fitted to the annular step portion 22b on the lower side of the formation portion of the liquid passage holes 24 of the throttle cylinder portion 22 from below. It is tightened by the screwed nut 26 and is wound around the throttle cylinder portion 22 so as not to be detached. Therefore, the valve rod 2 arranged in the nozzle body 1 is dimensioned so that it always slides in contact with the guide protrusions 13 of the nozzle body 1 on the outer peripheral surface of the elastic ring member 25 in its lifting and lowering operation.

  In this liquid filling nozzle, each member constituting the other liquid contact portion is made of stainless steel except for the seal ring 7 and the elastic ring material 25 made of fluororubber.

  In the liquid filling nozzle having the above-described configuration, the liquid L in the liquid tank T installed at a high place is introduced from the liquid introduction port 1b at a constant liquid pressure due to potential energy. Thus, in the nozzle open state in which the valve rod 2 is in the raised position, as shown in FIG. 5 (A), the throttle tube portion 22 is detached upward from the discharge pipe portion 11b of the nozzle body 1, and the liquid inlet port. The liquid L supplied from 1b flows into the discharge pipe portion 11b from between the opened valve portion 6 and the annular valve seat 5, and is discharged from the discharge port 1a at the lower end thereof as a full liquid flow F1 having a caliber and disposed below. The required container (not shown) is filled. During this time, a part of the flow to the discharge pipe portion 11b passes through the liquid passage holes 24 and the throttle passage 23 of the throttle tube portion 22, flows out into the discharge pipe portion 11b from the lower end opening 23a, and is on the peripheral side. It merges with the flow of

  In the process of closing the container to stop the discharge when the container is almost full, the interval between the annular valve seat 5 and the throttle cylinder portion 22 is first reduced as the valve rod 2 is lowered. 22 does not change, the ratio of the flow passing through the throttle channel 22 in the flow to the discharge pipe portion 11b increases. The discharge from the outlet 1a is weakened in the peripheral part, and becomes faster and stronger in the central part. Next, when the throttle tube portion 22 is fitted into the discharge tube portion 11b and the seal ring 7 on the outer peripheral surface is slidably contacted with the inner peripheral surface of the discharge tube portion 11b, as shown in FIG. The flow in the peripheral portion along the inner peripheral surface of the discharge pipe portion 11b is interrupted and becomes only the flow in the center passing through the throttle channel 23 of the throttle tube portion 22, and the thin liquid flow F2 exiting from the lower end opening 23a is discharged as it is. The discharge liquid is discharged from the outlet 1a, and the discharge liquid flow comes into contact with the valve unit 6 approaching the annular valve seat 5 and closes in the process of closing, and the nozzle is closed as shown in FIG.

  As described above, the transition from the nozzle open state to the nozzle throttle state is performed in such a manner that the liquid flow passing through the discharge pipe portion 11b is gradually reduced toward the center side, and the thin liquid flow F2 in the nozzle throttle state is shown in FIG. As shown in B), the liquid L is discharged without any disturbance without coming into contact with the inner peripheral surface of the discharge pipe portion 11b, so that the liquid L does not scatter from the discharge port 1a to the periphery while the discharge is stopped by the valve closing. Therefore, the contamination of the container and peripheral devices due to the splash of liquid when the valve is closed, such as the conventional valve-filled liquid filling nozzle, is reliably avoided, and the entrainment of air due to the foaming of the liquid in the container is also prevented. This is suitable when the entry of air into the container is hated to prevent oxidative deterioration.

  Also, in this liquid filling nozzle, since the cleaning liquid is structurally spread over all wetted parts by flowing the cleaning liquid in the valve open state during line cleaning, it is troublesome like disassembly cleaning. Therefore, the entire wetted part is thoroughly cleaned. Moreover, since this liquid filling nozzle is structurally simple, it is excellent in operation reliability and durability and can be manufactured at low cost.

  In addition, the liquid filling nozzle of the present invention can use an air cylinder or a hydraulic cylinder other than the illustrated two-stage air cylinder 3 as an elevating drive means for elevating the valve rod 2, and various other elevating drive mechanisms are also available. It can be adopted. However, according to the two-stage fluid pressure cylinder such as the two-stage air cylinder 3 of this embodiment, the raising / lowering operation of the valve rod 2 can be set in two stages, so the filling conditions such as the properties of the liquid L and the filling speed Accordingly, there is an advantage that the speed from the nozzle throttle state to the nozzle closed state can be adjusted, and the final filling amount can be set with higher accuracy by adjusting the filling amount in the throttle state.

  Moreover, in the liquid filling nozzle of the present invention, various design changes can be made in addition to the embodiment with respect to the detailed configuration such as the member configuration and assembly structure of the nozzle body 1 and the valve rod 2, but like the valve rod 2 of the above embodiment. If the elastic ring material 25 having the valve portion 6 is sandwiched between the rod 21 and the throttle cylinder portion 22 which are independent members, the assembly and manufacture thereof are easy and the elastic ring material of the valve portion 6 Replacement work due to wear of 25 is also facilitated.

  Furthermore, in the above-described embodiment, the liquid tank T is installed at a high place and the liquid pressure is applied to the supplied liquid by the potential energy. However, the liquid pressure may be applied using a pressurized tank.

It is a longitudinal cross-sectional view of the liquid filling nozzle which concerns on one Embodiment of this invention. It is a cross-sectional arrow view of the AA line of FIG. It is a cross-sectional arrow view of the BB line of FIG. It is a half vertical side view which shows the principal part of the valve rod of the same liquid filling nozzle in an exploded state. The operation of the same liquid filling nozzle is shown, (A) is a nozzle open state, (B) is a nozzle throttle state, (C) is a longitudinal side view of the nozzle closed state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle body 1a Discharge port 1b Liquid introduction port 12b Discharge pipe part 2 Valve rod 21 Rod 22 Restriction cylinder part 23 Restriction flow path 23a Opening 24 Liquid passage hole 25 Elastic ring material 3 Two-stage air cylinder (lifting drive means)
5 Annular valve seat 6 Valve part T Liquid tank

Claims (4)

A vertical cylinder type nozzle body having a liquid inlet at the side with a lower end as a discharge port, a valve rod disposed concentrically in the nozzle body, and a lift drive means for moving the valve rod up and down,
An annular valve seat is formed on the inner periphery between the discharge port and the liquid inlet of the nozzle body,
A valve portion that can be tightly fitted to the annular valve seat from above at the lower portion of the valve stem, and projects concentrically downward from the valve portion, and is lower than the annular valve seat of the nozzle body when the valve is closed. A throttle tube part fitted into the discharge pipe part with a small gap is provided,
The throttle cylinder portion has a throttle channel inside and a lower end concentrically facing the discharge port, and has a fluid passage hole communicating with the throttle channel at a plurality of locations on the outer peripheral surface. A seal ring that is in sliding contact with the inner peripheral surface of the discharge pipe portion of the nozzle body is fitted to the lower outer peripheral surface,
Between the nozzle open state in which the throttle cylinder part is detached from the discharge pipe part of the nozzle body and the nozzle closed state in which the valve part is closely fitted to the annular valve seat, the throttle cylinder part is connected to the discharge pipe part of the nozzle body. A liquid-filled nozzle that is configured to appear in a nozzle throttling state in which the liquid that is inserted and flows out from between the valve portion and the annular valve seat is discharged through the liquid passage hole and the throttle tube portion of the throttle tube portion. .   2. A liquid filling nozzle according to claim 1, wherein said elevating drive means comprises a two-stage hydraulic cylinder mounted on the nozzle body.   The liquid filling nozzle according to claim 1, wherein the liquid introduction port is connected to a liquid tank or a pressurized tank installed at a high place, and a liquid pressure by positional energy or pressurization is applied to the introduced liquid. The said throttle cylinder part consists of an independent member screwed to the rod of a valve rod, and is comprised so that the elastic ring material which has the said valve part may be clamped between this throttle cylinder part and the said rod. Liquid filling nozzle in any one of -3.

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