JPH10141502A - gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of permanent set in fatigue and prevent infiltration of liquid by vertically extending a part in contact with the outer periphery of a cylinder of circular cross section of a gasket for filling a clearance of a part in contact with liquid, and forming such shape that an angle formed at the time of drawing a tangent from the tip of the vertically extended part to circular cross section is an acute angle. SOLUTION: A gasket 6c is so formed at an inner circumferential part in contact with the outer periphery of a cylinder is vertically extended and that an angle θformed by drawing a tangent from the tip (i) of an extended part to circular cross section is an acute angle. The outer diameter K1 and inner diameter K2 of the gasket 6c are determined according to the size of an applied object, and the vertically extended length of the inner circumferential part in contact with the outer periphery of the cylinder is suitably determined according to the shape of the applied object. In the state of a flange coming in contact with the external wall of a container, the acute angle part of the gasket 6c enters a clearance, formed by the tip of a conductivity meter and the container, so as to prevent infiltration of a fluid and fills a space of a part in contact with the fluid while sealing in the state of maintaining elasticity. As a result, breeding of bacteria and the possibility of corrosion can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket, and more particularly, to a gasket suitable for sealing a food fluid.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a general sealing structure using a gasket. In the figure, reference numeral 1 denotes a container or a tube in which a fluid is stored, and the container 1 has a circular hole 1a. Reference numeral 2 denotes a sensor unit such as a conductivity meter, which has an electrode 2a at the tip. The diameter of the sensor unit is slightly smaller than the diameter of a circular hole 1a formed in the container 1. Reference numeral 2b denotes a flange provided on the outer periphery of the conductivity meter, which regulates the depth of the sensor unit inserted when the flange comes into contact with the outer wall 1b of the container 1. Reference numeral 3 denotes a groove having a rectangular cross section provided on the outer periphery near the distal end of the conductivity meter 2, and an O-ring 4 is fitted in this groove. The size of the groove and the size of the O-ring are specified by standards.

[0003] In the above-mentioned sealing method, since the diameter of the hole 1a and the diameter of the sensor section 2 are different, there is a slight gap t.
Further, an engagement portion S is required to prevent the O-ring from falling off. In such a configuration, fluid enters from the gap A between the hole 1a and the sensor portion to the depth S. Therefore, when such a sealing method is used for a food fluid, the food fluid enters the gap A and stays there, which may cause bacterial growth or corrosion.

FIGS. 4 (a), 4 (b) and 4 (c) show a conventional example generally used as a food seal structure, in which the shape of the hole of the container, the shape of the sensor tip and the shape of the gasket are devised. It is. In FIG. 4 (a), the bottom of the hole 1a of the container 1 is machined to an inner diameter D up to a depth H, and the opening has a diameter d smaller than the inner diameter D, and the angle of the cross section connecting the inner diameter portion and the opening. Are formed, for example, so as to have an inclination of 45 °.

The large diameter portion D of the sensor 2₁Is the inner diameter D of the container 1
Slightly smaller, small diameter part d at the tip₁Is the opening of the hole 1a.
The flange 2b is formed slightly smaller than the diameter d.
When the abutment comes into contact with the outer wall 1b of the container 1, the tip e of the small diameter portion
Is located at the same position as the lower end f (opening) of the inclined portion of the hole 1a.
So that 90 °, 45 °, 45 °
A triangular space g having a corner is formed. The hole
1a and outer diameter D of sensor 2 ₁And the diameter d of the opening and the small diameter part
The diameter d of₁Is about 0.01 to 0.1 mm
Has been processed.

FIG. 4B is a sectional view of the space g shown in FIG.
It is a gasket to be stored in. This gasket 6a has a similar shape to the space g shown in FIG. 4a and is formed so as to have a slightly larger volume as a whole. As shown in FIG. 4 (c), the flange 2b is attached to the outer wall 1b of the container 1. Is held in a compressed state as a whole.

[0007]

By the way, in the conventional example shown in FIG. 4, the gasket 6a is sealed in the space section g. For this reason, the entire gasket is compressed, and the only place where the gasket escapes is the above-described dimensional difference. As a result, once used, there is a problem that "set (loss of elasticity)" occurs and repeated use cannot be performed. Since the O-ring seal shown in FIG. 2 has a circular cross section with respect to a rectangular cross section, there is room for volume at the corners and the problem of "set" does not occur.

FIG. 5 shows a conventional example in which the aforementioned "set" is improved. The depth H of the hole 1a shown in FIG. the length of the section d ₁ by lengthening is obtained by increasing the volume of the gasket 6b. However, this conventional example is similar to the conventional example shown in FIG. 4 in that the entire gasket is hermetically sealed and compressed, and is not a fundamental solution to "set".

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art.
While retaining the advantage of the ring, it is a shape that fills the gap between the parts that come in contact with the liquid to prevent intrusion of liquid,
Extend the part in contact with the outer periphery of the cylinder with a circular cross section in the vertical direction,
It is characterized in that the angle formed when a tangent is drawn from the tip of the extended portion to the circular cross section becomes an acute angle.

[0010]

FIG. 1 is a sectional view showing an example of an embodiment of the present invention. 6c is a gasket of the present invention In the figure, the gasket outer diameter K _1, the inner diameter K ₂ is assumed to be formed in the same manner as the O-ring shown in FIG. The gasket 6c is formed such that the portion of the inner periphery thereof in contact with the outer periphery of the cylinder is extended in the vertical direction, and the angle obtained by drawing a tangent to the circular cross section from the tip (the portion indicated by i) of the extended portion becomes an acute angle. Have been. Note that the outer diameter K ₁ and inner diameter K ₂ of the gasket are determined by the size of the target to be applied.
The length of the vertical extension of the inner peripheral portion in contact with the outer periphery of the cylinder is appropriately determined according to the shape of the target to be applied.

FIG. 2 shows a state in which the gasket of the present invention is applied to the container and the seal of the conductivity meter shown in FIG. 4, and the same elements as those in FIG. 4 are denoted by the same reference numerals. According to FIG. 2, the acute angle portion of the gasket 6c enters the gap A 'formed between the container 1 and the tip (small diameter portion) of the conductivity meter 2 while the flange 2 is in contact with the outer wall 1b of the container 1, and the fluid flows therethrough. Prevent intrusion. In addition, the circular portion of the gasket has a space in the space f formed in a triangular shape, and sealing can be performed while maintaining elasticity.

[0012]

As described in detail above, according to the present invention, basically, the shape of the O-ring is formed so as to fill the space in contact with the liquid while leaving the advantage of the O-ring (seal while maintaining elasticity). To prevent liquid intrusion. As a result, a gasket free from the risk of bacterial growth and corrosion was realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gasket showing an example of an embodiment of the present invention.

FIG. 2 is a sectional view showing an application example of the gasket of the present invention.

FIG. 3 is a cross-sectional view showing an application example of a conventional gasket.

FIG. 4 is a cross-sectional view showing an application example of another conventional gasket.

FIG. 5 is a sectional view showing an application example of another conventional gasket.

[Explanation of symbols]

 Reference Signs List 1 container 2 sensor (conductivity meter) 2a electrode 2b flange 6 gasket

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shinichi Urushihata 2-9-132 Nakamachi, Musashino City, Tokyo Inside Yokogawa Electric Corporation

Claims (1)

[Claims] 1. A ring gasket wound around the outer periphery of a cylindrical portion to seal a liquid, wherein a portion of the circular cross-section in contact with the outer periphery of the cylinder is extended in a vertical direction, and a circular shape is formed from the tip of the extended portion. A gasket characterized in that an angle when a tangent line is drawn with respect to a cross section is an acute angle.