TW202115336A - Seal member and seal mechanism - Google Patents

Abstract

The present invention is a seal member 3 which ensures sealing performance while reducing the occurrence of dirt and dust, and which is made up of an elastic material that is fitted onto a male threaded portion 2 that screws together with a female threaded portion 11 in a connection-receiving member 10 and that, due to the movement of a nut member 4 provided on the male threaded portion 2, undergoes elastic deformation between the connection-receiving member 10 and the nut member 4 and provides a seal therebetween. This seal member has an annular main body 31, and lip sections 32, which are provided on the inner circumferential surface 31a of the main body 31 and protrude radially inward. The lip portions 32 are provided at portions of the inner circumferential surface of the main body in the circumferential direction, and have a substantially triangular shape in a cross section along the axial direction.

Description

Sealing component and sealing mechanism

The present invention relates to a sealing member and a sealing mechanism.

Conventionally, a sealing structure as shown in Patent Document 1 is used to liquid-tightly seal between connected members such as various fluid equipment and manifolds and pipe joints connected to the connected members in a liquid-tight manner.

The elastic ring (seal member) used in this sealing structure is an annular ring with a predetermined thickness dimension, and has an annular inner diameter small lip with a triangular cross section on a flat inner peripheral surface. In addition, the ring-shaped inner diameter small lip is in a closed ring shape, and the shape of the elastic ring is formed vertically symmetrical.

However, in the above-mentioned elastic ring, since the annular inner diameter small lip is provided on the entire circumference of the inner peripheral surface, the contact resistance with the male screw portion becomes larger. In addition, in the state where the elastic ring is installed on the male thread portion, the annular inner diameter small lip contacts the crest and expands outward, resulting in a larger outer diameter, which makes it difficult to smoothly accommodate the end face of the nut. Storage space. As such, the above-mentioned elastic ring has a problem that it is difficult to handle. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 3010407

[The problem to be solved by the invention]

Therefore, the present invention aims to solve the above-mentioned problems, and its main problem is to ensure the sealing performance and make it easy to handle. [Means to solve the problem]

That is, the sealing member requested by the present invention is composed of an elastic material, and the sealing member is fitted into a male thread portion screwed to the female thread portion of the connected member, and is provided by the male thread portion The nut member moves so that the sealing member is elastically deformed between the connected member and the nut member to seal between the connected member and the nut member, and the sealing member has: a body portion that is round Ring; and a lip-shaped portion, which is provided on the inner peripheral surface of the main body portion and protrudes toward the radially inner side; the lip-shaped portion is partially provided in the circumferential direction on the inner peripheral surface of the main body portion, and the lip The cross-section of the shape part along the axial direction is roughly triangular.

According to the sealing member configured in this way, since the lip portion is partially provided in the circumferential direction on the inner peripheral surface of the main body portion, the contact resistance with the male screw portion can be reduced. In addition, since it is not necessary to span the crest of the male thread portion, the sealing member can be prevented from expanding radially outward, and the outer diameter can be prevented from increasing. As a result, the handling of the sealing member can be made easy. In addition, since the lip portion has a roughly triangular cross-section along the axial direction, it is easy to enter the root of the male thread portion, and sealing performance can be ensured.

In order for the lip portion to easily enter the root of the male thread portion, the lip portion has a straight front end side in a plan view, and both ends of the front end side are preferably connected to the inner peripheral surface of the main body.

The sealing member of the present invention may have a plurality of lips. In this case, the plurality of lips should be arranged at equal intervals in the circumferential direction.

In order to make the manufacture of the sealing member easy and improve the quality of the sealing member, the lip portion is preferably provided to deviate from the center position of the main body in the axial direction.

In addition, the sealing mechanism of the present invention includes: a male threaded portion screwed to a female threaded portion formed on a connected member and connected to the connected member; the sealing member is fitted into the male threaded portion; and a nut member , Located in the male threaded portion; by locking the nut member, the sealing member is elastically deformed between the connected member and the nut member to be sealed.

The inner corner of the nut member facing the front end surface of the sealing member is formed with a ring-shaped recess for accommodating the sealing member, and the inner surface of the recess is preferably pushed and pulled with a larger diameter toward the front end surface. [Effects of the invention]

According to the above-mentioned present invention, the sealing property can be ensured and the handling can be facilitated.

Hereinafter, with reference to the drawings, an embodiment of the sealing mechanism using the sealing member of the present invention will be described.

＜1. Composition of sealing mechanism＞ As shown in FIG. 1, the sealing mechanism 100 of this embodiment is liquid-tight or air-tight between a connected member 10 such as various fluid devices or manifolds and a piping joint 20 connected to the connected member 10 Way to be sealed.

Specifically, the sealing mechanism 100 includes: a male threaded portion 2 which is screwed to a female threaded portion 11 formed on the inner surface of the flow path opening of the connected member 10 and connected to the connected member 10; and the sealing member 3 is fitted in The male threaded portion 2; and the nut member 4 are screwed on the male threaded portion 2. In addition, the male screw portion 2, the sealing member 3, and the nut member 4 constitute a pipe joint 20, and in this embodiment constitute an elbow.

Next, after screwing the male threaded portion 2 to the female threaded portion 11 so that the piping joint 20 has a desired position with respect to the connected member 10, the nut member 4 is moved toward the connected member 10 and locked , The sealing member 3 is elastically deformed between the connected member 10 and the nut member 4 to be sealed.

Here, in the nut member 4, an annular recess 41 for accommodating the sealing member 3 is formed at the inner corner of the front end surface facing the sealing member 3 side. This recess 41 is used to accommodate the sealing member 3 when the sealing member 3 is elastically deformed between the connected member 10 and the nut member 4. In addition, the inward facing surface 41a of the recessed portion 41 is a push-out surface whose diameter increases toward the tip. Thereby, when the nut member 4 is locked, the locking force becomes an inward force through the push-out surface, so that the sealing member 3 can easily and quickly enter the root (valley portion) of the male screw portion 2.

<2. Specific structure of sealing member 3> The sealing function of the sealing member 3 of this embodiment is to use the roots of at least one of the male threaded portions 2 covered by the sealing member 3 to seal fluid, and use the teeth of the male threaded portion 2 covered by the sealing member 3 Seal the fluid all around the peak.

Specifically, as shown in FIGS. 2 to 4, the sealing member 3 is a one-piece molded product made of an elastic material as a whole, and has: a body portion 31, which is in an annular shape; and a plurality of lip-shaped portions 32, which are provided on the body The inner peripheral surface 31a of the portion 31 protrudes toward the radially inner side. In addition, as the elastic material, it can be nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluoro rubber (FKM), ethylene propylene diene rubber (EPDM) and other rubbers. It can also be silicone resin, polyacetal ( Flexible resins such as POM) and polytetrafluoroethylene (PTFE) can also be soft metals such as aluminum, brass, copper, cold rolled steel plate (SPCC), and other elastomers can also be used.

As shown in FIG. 5, the main body portion 31 has an axial length of 1 pitch or more of the male thread portion 2. With this configuration, the main body portion 31 is in contact with the crest of the male screw portion 2 for more than one turn.

In FIG. 5, the axial length of the main body 31 is L, the part covered by the main body 31 is the L zone, the right side (high pressure side) of the main body 31 is U zone, and the left side (low pressure side) Set as D zone. Here, there are two types of fluid leakage in the outer peripheral surface of the male threaded portion 2: leakage that moves over the crest of the male threaded portion 2 and leakage that moves along the root of the male threaded portion 2.

In Fig. 5, the fluid on the outer peripheral surface of the male threaded portion 2 crosses the crest 2a-1 of the U zone and flows into the root 2b of the L zone. The fluid that moves along the roots 2a-2 of the U zone also flows into the roots 2b of the L zone. At this time, as indicated by the thick arrow, the fluid moving to the root 2b in the L zone is blocked by the lip 32 from moving to the D zone.

Here, if the L zone (the axial length L of the main body portion 31) does not reach 1 pitch of the male thread portion 2, depending on the arrangement of the lip portion 32 in the circumferential direction, the prevention of the lip portion 32 may not be insufficient. Therefore, the L zone should be at least 1 pitch of the male threaded portion 2, preferably 1.5 pitches or more.

In particular, as shown in FIG. 3, a plurality of lip-shaped portions 32 are provided separately from each other in the circumferential direction. The plural lip-shaped portions 32 enter the root of the male thread portion 2 and seal the root (refer to FIG. 5). In this embodiment, the plural lip-shaped portions 32 are provided in three at equal intervals (radially) in the circumferential direction. In this way, there are an odd number of lip-shaped portions 32, and since there is no lip-shaped portion on the opposing surface of one lip-shaped portion 32, contact resistance can be reduced. In addition, when there are an even number of lip-shaped portions 32, since one lip-shaped portion 32 is located on the opposing surface of the other lip-shaped portion 32, there is a concern that the contact resistance may increase.

In addition, the plural lip-shaped portions 32 have the same shape as each other, and as shown in FIG. 4, the cross-section along the axial direction is roughly triangular. The lip portion 32 of the present embodiment has a shape in which the bottom surface 32a is substantially vertical with respect to the axial direction and the inner side surface 32b is inclined with respect to the axial direction. With this structure, in the molding described later, the rubber easily enters the lower mold, making it easy to manufacture by molding.

Furthermore, as shown in FIG. 3, the plural lip-shaped portions 32 have a front end side 32 c that is linear in a plan view, and both ends of the front end side 32 c are connected to the inner peripheral surface 31 a of the main body portion 31.

In addition, the plural lip-shaped portions 32 are provided to deviate from the center position of the main body portion 31 in the axial direction. In the present embodiment, the main body portion 31 is provided to deviate from the center position to the lower side. That is, the lip portion 32 is provided to be offset from the main body portion 31 toward the bottom surface 32a side. With this configuration, the manufacturing by molding described later becomes easy.

By using the sealing member 3 constructed in this way, as shown in FIG. 5, the body portion 31 of the sealing member 3 contacts the crest of the male thread portion 2 for more than one week and seals it, and the plural lip portions 32 are in one or more places. Enter the root of the male thread 2 and seal it. Thereby, the sealing member 3 seals between the connected member 10 and the nut member 4.

Next, the manufacturing method of the sealing member 3 of this embodiment is briefly demonstrated with reference to FIG. 6(A). In addition, FIG. 6(B) shows a manufacturing method of the sealing member 3 in which the lip portion 32 is provided at the center position in the axial direction of the main body portion 31 as in the prior art.

In this embodiment, the sealing member 3 is manufactured using the upper mold Z1 and the lower mold Z2. Here, the parting line PL1 inside the sealing member 3 in the upper mold Z1 and the lower mold Z2 is set on the same plane as the bottom surface 32a of the lip portion 32. In addition, the parting line PL2 outside the sealing member 3 in the upper mold Z1 and the lower mold Z2 is set higher than the center position of the main body portion 31 in the axial direction. By setting the parting lines PL1 and PL2 in this way, air can be surely extracted during molding, and the quality of the sealing member 3 can be improved.

On the other hand, in order to extract air during molding, the conventional sealing member 3 is manufactured using an upper mold Z1, a lower mold Z2, and an intermediate mold Z3 (refer to FIG. 6(B)). Here, the parting line PL3 inside the sealing member 3 in the upper mold Z1 and the lower mold Z2 is set at the apex of the lip portion 32. In addition, the parting lines PL4 and PL5 of the upper mold Z1 and the intermediate mold Z3 are set above and below the central position of the main body 31 in the axial direction. As such, in the conventional sealing member 3, three molding dies are necessary, and the moving means or sequence of each molding dies becomes complicated.

<3. Effects of this embodiment> In this way, in the sealing mechanism 100 of the present embodiment, the lip portion 32 is partially provided on the inner peripheral surface 31a of the main body portion 31 along the circumferential direction, so that the contact resistance with the male screw portion 2 can be reduced. In addition, since it is not necessarily required to span the crest of the male thread portion 2, it is possible to prevent the sealing member 3 from swelling outward in the radial direction, thereby preventing the outer diameter from increasing. As a result, the handling of the sealing member 3 can be made easy. In addition, since the lip portion 32 has a roughly triangular cross-section along the axial direction, it is easy to enter the root of the male thread portion 2, and sealing performance can be ensured.

<4. Other implementation modes> In addition, the present invention is not limited to this embodiment.

For example, in this embodiment, the case where the sealing mechanism 100 is applied to an elbow is described, but it may be applied to other piping joints.

FIG. 7 shows an example of an adjustable length connecting pipe 30 applied to the connection between the two pipes H1 and H2. This connecting pipe 30 includes: a first pipe element 5 connected to the pipe H1 on one side; and a second pipe element 6 connected to the pipe H2 on the other side, and a female thread portion 51 is formed on the inner surface of the first pipe element 5 , A male screw portion 61 is formed on the outer surface of the second pipe element 6. Furthermore, by adjusting the locking amount of the second tube element 6 to the first tube element 5, the length of the connecting pipe 30 is adjustable. In addition, the sealing member 3 of the aforementioned embodiment is fitted into the male screw portion 61 of the second pipe element 6, and the nut member 4 of the aforementioned embodiment is screwed. Next, after adjusting the locking amount of the second pipe element 6 to the first pipe element 5, the nut member 4 is moved toward the first pipe element 5, so that the sealing member 3 is placed on the first pipe element 5 and the screw The cap members 4 are elastically deformed to seal the gap between the first pipe element 5 and the nut member 4.

In addition, FIG. 8 shows an example applied to a branch pipe 8 connected to a plurality of branch pipes 7. A plurality of female threaded portions 81 are formed in the branch pipe 8, and the plurality of female threaded portions 81 are locked in and connected with the male threaded portions 71 of the branch pipes 7. In addition, the male screw portion 71 of the branch pipe 7 is fitted with the sealing member 3 of the aforementioned embodiment, and the nut member 4 of the aforementioned embodiment is screwed. Next, after locking and connecting the branch pipe 7 to the branch pipe 8, by moving the nut member 4 toward the branch pipe 8, the sealing member 3 is elastically deformed between the branch pipe 8 and the nut member 4. The branch pipe 8 and the nut member 4 are sealed.

Furthermore, in FIG. 9, an example of the structure applied to connect the pipe 12 to the container 9 is shown. This container 9 has a side wall 91 that is flat. The side wall 91 of the container 9 is formed with a connecting hole for inserting the male screw portion 121 of the pipe 12, the male screw portion 121 of the pipe 12 is inserted into the connecting hole, and the nut members 4a, 4b are used from the inside and outside of the container, respectively. The side wall 91 is clamped and fixed. At this time, the sealing member 3 of this embodiment is fitted inside or outside of the container in the male screw portion 121 of the pipe 12, and the sealing member 3 is elastically deformed between the side wall 91 and the inner or outer nut members 4a, 4b , And seal between these components.

In addition, the lip 32 is not limited to three, and it may be an odd number such as one, five, or seven, or an even number.

Furthermore, the plural lip-shaped portions 32 of the foregoing embodiment may have the same shape or different shapes.

In addition, the plurality of lip-shaped portions 32 may also be provided at positions different from each other in the axial direction with respect to the main body portion 31.

In addition, the present invention is not limited to the foregoing embodiment, and of course various modifications can be made within the scope that does not deviate from the spirit of the present invention.

10: connected components 11: Female thread 12: Piping 121: Male thread 100: Sealing mechanism 2: Male thread 20: Fittings for piping 3: Sealing member 30: Connecting piping 31: Body part 31a: inner peripheral surface 32: Lips 32a: bottom surface 32b: medial side 32c: Front edge 4, 4a, 4b: Nut member 41: recess 41a: Inward-facing surface of the recess (push-pull surface) 5: The first pipe requirement 51: Female thread 6: The second pipe requirement 61: Male thread 7: branch 71: Male thread 8: Branch piping 81: Female thread 9: container 91: side wall H1, H2: Tube L: The axial length of the main body 31 PL1~PL5: Parting line Z1: Upper mold Z2: Lower mold Z3: Intermediate mold

[Fig. 1] A cross-sectional view schematically showing the sealing mechanism in an embodiment of the present invention. [Figure 2] A perspective view schematically showing the sealing member of the same embodiment. [Fig. 3] A plan view schematically showing the sealing member of the same embodiment. [Fig. 4] A cross-sectional view of the A-A section of the sealing member in Fig. 3 is schematically shown. [Figure 5] A schematic diagram showing the outline of the sealing mechanism performed by the sealing member of the same embodiment. [FIG. 6] (A) and (B) schematically show cross-sectional views of (A) the manufacturing method of this embodiment and (B) the manufacturing method of the conventional example. [Fig. 7] A partial cross-sectional view schematically showing the sealing mechanism in the modified embodiment. [Fig. 8] A cross-sectional view schematically showing the sealing mechanism in the modified embodiment. [Figure 9] A partial cross-sectional view showing the outline of the sealing mechanism in the modified embodiment.

3: Sealing member

31: Body part

31a: inner peripheral surface

32: Lips

32b: medial side

32c: Front edge

Claims (6)

A sealing member is composed of an elastic material. The sealing member is fitted into a male threaded portion screwed to a female thread of a connected member, and moved by a nut member provided on the male threaded portion, The sealing member is elastically deformed between the connected member and the nut member to seal the connected member and the nut member, and the sealing member has: The body part is annular; and The lip-shaped portion is provided on the inner peripheral surface of the body portion and protrudes toward the radially inner side; The lip-shaped portion is partially disposed along the circumferential direction on the inner peripheral surface of the main body portion, and the cross-section of the lip-shaped portion along the axial direction is roughly triangular. Such as the sealing member of claim 1, in which, The lip portion has a straight front end side in a plan view, and both ends of the front end side are connected to the inner peripheral surface of the main body. Such as the sealing member of claim 1 or 2, in which, The lip-shaped part is provided in plural, The plural lip-shaped parts are arranged at equal intervals in the circumferential direction. Such as the sealing member of claim 1 or 2, in which, The lip portion is provided to deviate from the center position in the axial direction of the main body portion. A sealing mechanism, including: The male threaded part is screwed to the female threaded part formed on the connected component and connected to the connected component; If the sealing member of any one of claims 1 to 4 is fitted into the male thread part; and The nut member is arranged on the male thread part; By locking the nut member, the sealing member is elastically deformed between the connected member and the nut member to seal. Such as the sealing mechanism of claim 5, in which, An inner corner portion of the nut member facing the front end surface on the sealing member side is formed with a ring-shaped recess for accommodating the sealing member, The inward-facing surface of the recess is a push-pull surface with a larger diameter toward the tip.

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