JP2019001472A - Fitting sealing structure for beverage container - Google Patents

Abstract

To prevent damages of a seal ring 10 and maintain stable sealability in the fitting sealing structure for a beverage container.SOLUTION: The seal ring 10 is provided between a cap 102 of a beverage container and a mounting component 103. The seal ring 10 includes seal body parts 11 and 12 which are in close contact with a flange face 102a formed on the inner peripheral surface of the cap 102 and a flange face 103b formed on the outer peripheral surface of the mounting component 103, and a base part 13 extending from the seal body parts 11 and 12 radially inwardly from the flange face 102a of the cap 102 and loosely fitted to the outer peripheral surface of the mounting component 103. An interference avoiding part 14 lifted from the inner diameter end of the flange face 102a of the cap 102 is formed in the radial position corresponding to the inner diameter end of the flange face 102a of the cap 102.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sealing structure that seals between a base for fitting a beverage container such as a beer barrel and an attachment member for attaching a dispense head to the base.

  FIG. 5 shows a sealing structure of a beer barrel fitting according to the prior art. In the beer barrel fitting shown in FIG. 5, a cylindrical mounting member 103 is screwed into the inner periphery of the base 102 formed at the top of the beer barrel 101, and the gap between the base 102 and the mounting member 103 is The gap is sealed by a seal ring (square ring) 104 made of a rubber-like elastic material having a quadrangular cross-sectional shape to prevent leakage of carbon dioxide gas and draft beer from the beer barrel 101.

  The upper part of the down tube 105 is inserted in the inner periphery of the attachment member 103 so as to be movable up and down, and an annular gas valve 106 is attached to the upper end of the down tube 105. The gas valve 106 normally has an outer peripheral seal surface 106a formed by a biasing force of a first coil spring 107 interposed in a compressed state between the lower end portion of the mounting member 103 and the upper end flange portion 105a of the down tube 105. It is in close contact with a valve seat 103 a formed on the inner periphery of the upper portion of the mounting member 103.

  A beer valve 108 is inserted into the upper end of the down tube 105 so as to be movable up and down. Normally, the biasing force of the second coil spring 109 inserted in the down tube 105 in a compressed state causes the gas valve 106 to It is in close contact with a valve seat 106b formed on the lower inner periphery.

  A dispense head (not shown) can be attached to the base 102 and the attachment member 103. By operating the dispensing head, the gas valve 106 is pushed down against the biasing force of the first coil spring 107 to open the valve, and the beer valve 108 is lifted against the biasing force of the second coil spring 109. A valve operation is performed by pushing down, whereby pressurized carbon dioxide gas is supplied into the beer barrel 101 and draft beer in the beer barrel 101 is poured out through the down tube 105 (for example, Patent Document 1). 2).

JP 2010-173710 A JP 2004-269000 A

  Further, as shown in FIG. 6, the seal ring 104 has an axial direction between an upward flange surface 102 a formed on the inner peripheral surface of the base 102 and a downward flange surface 103 b formed on the outer peripheral surface of the mounting member 103 ( When the seal ring holding groove 103c is formed on the outer peripheral surface of the mounting member 103, the gap between the upward flange surface 102a on the base 102 side and the holding groove 103c on the mounting member 103 side is compressed. Since a large radial clearance C is formed in the seal ring 104, a part 104a on the inner diameter side of the seal ring 104 subjected to compression is greatly bulged and deformed into the clearance C, and the radial direction corresponding to the inner diameter end of the upward flange surface 102a Since the position strongly interferes with the corner 102b at the inner diameter end of the upward flange surface 102a, there is a concern that damage due to stress concentration may occur in this portion.

  The present invention has been made in view of the above points, and its technical problem is to prevent damage to the seal ring and maintain stable sealing performance in the sealing structure of a beverage container fitting. It is in.

  In order to solve the technical problem described above, a sealing structure for a beverage container fitting according to the invention of claim 1 includes a seal ring between a mouthpiece of the beverage container and an attachment member screwed to the inner periphery of the mouthpiece. The seal ring includes a flange surface formed on the inner peripheral surface of the base and a seal body portion in close contact with the flange surface formed on the outer peripheral surface of the mounting member. A base portion extending from the flange surface of the base to the inner diameter side and loosely fitted to the outer peripheral surface of the mounting member, and having an inner diameter of the flange surface of the base at a radial position corresponding to an inner diameter end of the flange surface of the base It is characterized in that an interference avoiding portion that is lifted from the end is formed.

  The sealing structure of the beverage container fitting according to the invention of claim 2 is the structure according to claim 1, wherein the width of the seal ring in the height direction decreases toward the inner diameter side, and the seal body portion is formed of a seal lip. It is characterized by this.

  A beverage container fitting sealing structure according to a third aspect of the invention is characterized in that, in the configuration of the first aspect, the interference avoiding portion is formed of a constricted portion continuous in the circumferential direction.

  According to the sealing structure of the beverage container fitting according to the present invention, the seal ring is compressed between the upward flange surface formed on the inner peripheral surface of the base and the downward flange surface formed on the outer peripheral surface of the mounting member. However, since the radial position corresponding to the inner diameter end of the flange surface of the base does not interfere strongly with the corner of the inner diameter end of the upward flange surface, damage to the seal ring can be prevented and stable sealing performance can be maintained. it can.

It is sectional drawing which shows 1st embodiment of the sealing structure of the fitting for drink containers which concerns on this invention with the internal structure of the nozzle | cap | die part of a beer barrel. It is principal part sectional drawing which shows 1st embodiment of the sealing structure of the fitting for drink containers which concerns on this invention. It is sectional drawing which shows 2nd embodiment of the sealing structure of the fitting for drink containers which concerns on this invention with the internal structure of the nozzle | cap | die part of a beer barrel. It is principal part sectional drawing which shows 2nd embodiment of the sealing structure of the fitting for drink containers which concerns on this invention. It is sectional drawing which shows an example of the sealing structure of the fitting for drink containers which concerns on a prior art with the internal structure of the nozzle | cap | die part of a beer barrel. It is a fragmentary sectional view which shows an example of the sealing structure of the fitting for drink containers which concerns on a prior art.

  Hereinafter, a preferred embodiment in which a sealing structure for a beverage container fitting according to the present invention is applied to beer barrel fitting will be described with reference to the drawings. 1 and 2 show a first embodiment of the present invention.

  In FIG. 1, reference numeral 101 denotes a beer barrel, and a base 102 is formed on the upper portion of the beer barrel 101. A female screw 1021 is formed on the inner peripheral surface of the base 102, and a male screw 1031 formed on a cylindrical mounting member 103 disposed on the inner periphery of the base 102 is screwed into the female screw 1021. ing. The beer barrel 101 corresponds to the beverage container described in claim 1.

  An upper part of the down tube 105 is inserted in the inner periphery of the attachment member 103 so as to be movable up and down, and a gas valve 106 is attached to the upper end of the down tube 105. The gas valve 106 is formed in a ring shape from a rubber material or a synthetic resin material having rubber-like elasticity, and a lower outer peripheral surface thereof is fixedly attached to the inner periphery of the upper end of the down tube 105 by press fitting, and is made of metal. The reinforcing ring 1061 is embedded integrally.

  A first coil spring 107 is interposed between the lower end flange 103d of the mounting member 103 and the upper end flange 105a of the down tube 105 in a compressed state as appropriate. 106 is always urged upward together with the down tube 105. A valve seat 103a having a conical surface with a smaller diameter toward the upper side is formed on the upper inner peripheral surface of the mounting member 103, and the gas valve 106 has a seal surface 106a formed on the outer periphery of the upper end thereof. The valve seat 103a is in close contact with the urging force of the first coil spring 107.

  A beer valve 108 is inserted into the upper end of the down tube 105 so as to be movable up and down. This beer valve 108 is normally attached to a valve seat 106b formed on the lower inner periphery of the gas valve 106 by the urging force of the second coil spring 109 supported by a step 105b formed on the down tube 105 at the lower end. Have been closely.

  A dispense head (not shown) is attached to the base 102 and the attachment member 103. The dispensing head pushes down the gas valve 106 together with the down tube 105 against the urging force of the first coil spring 107, thereby opening the sealing surface 106a of the gas valve 106 away from the valve seat 103a and opening the beer valve 108. The beer valve 108 is separated from the valve seat 106b of the gas valve 106, and the upper end opening of the down tube 105 is opened by pushing down the second coil spring 109 against the urging force of the second coil spring 109. Carbon gas is supplied into the beer barrel 101, and draft beer in the beer barrel 101 is poured out through the down tube 105.

  As a sealing structure for preventing carbon dioxide gas and draft beer in the beer barrel 101 from leaking from the gap between the base 102 and the attachment member 103, the female screw 1021 of the base 102 and the male screw 1031 of the attachment member 103 are A seal ring 10 is interposed at a position below the threaded portion.

  Specifically, an upward flange surface 102a shown in FIG. 2 is formed on the lower inner peripheral surface of the female screw 1021 in the base 102, and a lower outer peripheral surface of the male screw 1031 in the mounting member 103 is illustrated in FIG. 2 is formed, and the downward flange surface 103b, which is the upper end surface of the seal ring holding groove 103c, faces the upward flange surface 102a of the base 102 vertically.

  The seal ring 10 is formed of a rubber material or a synthetic resin material having rubber-like elasticity such as HNBR (hydrogenated nitrile rubber) or EPDM (ethylene propylene rubber), and has an upward flange surface 102a and a base 102. A pair of seal lips 11, 12 that are in close contact with the downward flange surface 103b of the attachment member 103 and face the outer diameter side, and extend from the seal lips 11, 12 to the inner diameter side of the upward flange surface 102a to hold the seal ring of the attachment member 103 And a base 13 loosely fitted to the outer peripheral surface of the groove 103c. The seal lips 11 and 12 correspond to the seal main body described in claim 1.

  That is, the seal ring 10 has a substantially V-shaped cross section, and has a tapered surface whose lower surface (the lower surface of the seal lip 11 and the base portion 13) becomes higher toward the inner diameter side, and the upper surface (the seal lip 12 and the base portion 13). The upper surface has a tapered surface that becomes lower toward the inner diameter side. For this reason, the width in the height direction decreases toward the inner diameter side, and is between the seal lip 11 and the base portion 13 (the base of the seal lip 11). The radial position corresponding to the inner diameter end of the upward flange surface 102a is the interference avoiding portion 14 that is lifted from the corner portion 102b of the inner diameter end of the upward flange surface 102a.

  The seal ring 10 is concentric with the base 102 and the attachment member 103 by loosely fitting the inner peripheral surface of the base portion 13 into the seal ring holding groove 103 c, and the male screw 1021 of the base 102 is connected to the male screw 1021 of the attachment member 103. By screwing in the screw 1031, the seal lips 11 and 12 are deformed up and down to come into close contact with the upward flange surface 102 a and the downward flange surface 103 b, and leakage of carbon dioxide gas and draft beer in the beer barrel 101 shown in FIG. In addition to preventing intrusion of foreign matter and the like from the outside.

  And according to the said structure, since the seal ring holding groove 103c is formed in the outer peripheral surface of the attachment member 103, it is large between the upward flange surface 102a on the nozzle | cap | die 102 side, and the holding groove 103c on the attachment member 103 side. Although the seal ring 10 has a radial clearance C, the seal body in close contact with the upward flange surface 102a and the downward flange surface 103b is composed of the seal lips 11 and 12, and the width of the seal ring 10 in the height direction is the inner diameter side. Therefore, the filling rate between the flange surfaces 102a and 103b is small, so that the base 13 on the inner diameter side does not bulge and deform into the clearance C, and the root of the seal lip 11 is upward. The radial position corresponding to the inner diameter end of the flange surface 102a is the position of the inner diameter end of the upward flange surface 102a. Since that is the interference avoiding portion 14 lifted from the part 102b, it without interfering strongly with the corners 102b, thus to effectively prevent damage can maintain stable sealability.

  Further, when the fitting shown in FIG. 1 is sterilized with high-temperature steam, the pressure inside the seal ring 10 becomes higher than the outside due to an increase in the internal pressure, but this pressure is the seal lip 11 of the seal ring 10. , 12 act in the direction of opening from the upward flange surface 102a and the downward flange surface 103b, the internal pressure is released when the internal pressure rises above a predetermined value. For this reason, the foreign material etc. which entered the outer side of the seal ring 10 are removed, and an excessive rise in internal pressure is prevented.

  Next, FIG.3 and FIG.4 shows 2nd embodiment of the sealing structure of the beer keg fitting which concerns on this invention.

  In this second embodiment, the seal ring 10 is formed in a substantially rectangular shape with a cross-sectional shape that is horizontally long, and has an outer diameter in close contact with the upward flange surface 102a of the base 102 and the downward flange surface 103b of the attachment member 103. Side seal main body 15 and a base portion 16 extending from the seal main body portion 15 toward the inner diameter side from the upward flange surface 102a and loosely fitted on the outer peripheral surface of the seal ring holding groove 103c of the mounting member 103.

  Further, in the circumferential direction between the seal main body 15 and the base 16 in the seal ring 10, that is, in the radial intermediate portion and on the upper and lower surfaces at the radial position corresponding to the inner diameter end of the upward flange surface 102 a of the base 102. Constricted portions 17 and 18 are formed, and the constricted portion 17 on the lower surface is an interference avoiding portion 14 that is lifted from the corner portion 102b at the inner diameter end of the upward flange surface 102a.

  The configuration of the other parts is the same as in FIGS.

  The seal ring 10 is concentric with the base 102 and the mounting member 103 by loosely fitting the inner peripheral surface of the base portion 16 into the seal ring holding groove 103 c, and the male screw 1021 of the base 102 is connected to the male thread 1021 of the mounting member 103. By screwing the screw 1031, the seal body 15 is compressed and brought into close contact with the upward flange surface 102 a and the downward flange surface 103 b, and a required sealing function against carbon dioxide gas and draft beer in the beer barrel 101 shown in FIG. It is something that demonstrates.

  And according to the said structure, since the seal ring holding groove 103c is formed in the outer peripheral surface of the attachment member 103, it is large between the upward flange surface 102a on the nozzle | cap | die 102 side, and the holding groove 103c on the attachment member 103 side. Although the seal ring 10 has the radial clearance C, the seal ring 10 is constricted in its bulging deformation to the inner diameter side due to the stress even when the seal body 15 is compressed between the upward flange surface 102a and the downward flange surface 103b. 17 and 18, the inner diameter side base portion 16 does not bulge and deform into the clearance C, and the constricted portion 17 on the lower surface is lifted from the corner portion 102 b at the inner diameter end of the upward flange surface 102 a. Since it becomes the interference avoidance part 14, the seal ring 10 does not interfere strongly with the corner part 102b. Therefore it is possible to maintain stable sealability to effectively prevent damage.

10 Seal ring 11, 12 Seal lip (Seal body)
13, 16 Base portion 14 Interference avoidance portion 15 Seal body portion 17, 18 Constriction portion 101 Beer barrel (beverage container)
102 Base 102a Upward flange surface 102b Corner portion 103 Mounting member 103b Downward flange surface 103c Seal ring retaining groove

Claims (3)

  A seal ring is interposed between the mouthpiece of the beverage container and an attachment member screwed to the inner periphery of the mouthpiece, and the seal ring includes a flange surface formed on the inner peripheral surface of the mouthpiece and the attachment member. A seal main body portion in close contact with the flange surface formed on the outer peripheral surface of the base, and a base portion extending from the seal main body portion toward the inner diameter side from the flange surface of the base and loosely fitted on the outer peripheral surface of the mounting member. A beverage container fitting sealing structure, characterized in that an interference avoiding portion is formed at a radial position corresponding to the inner diameter end of the flange face of the base, and is raised from the inner diameter end of the flange face of the base.   2. The beverage container fitting sealing structure according to claim 1, wherein a width of the seal ring in a height direction decreases toward an inner diameter side, and the seal main body portion includes a seal lip.   2. The sealing structure for a beverage container fitting according to claim 1, wherein the interference avoiding portion comprises a constricted portion continuous in the circumferential direction.

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