JP2019074142A - Joint seal - Google Patents

Abstract

To provide a joint seal 11 which is attached between an engagement member 61 engaged with a step-like engagement part 52 provided on an inner peripheral surface 51a of an outer peripheral side member 51 in a joint structure and a screw member 71 screwed with a screw 53 provided on the inner peripheral surface 51a of the outer peripheral side member 51, and which can be easily set in a suitable leaned state during screwing and is excellent in attachment performance and sealing performance.SOLUTION: A joint seal 11 includes a reinforcement ring 21, and a rubber-like elastic body 31 attached to the reinforcement ring 21. The reinforcement ring 21 has a flange 23 fastened between an engagement member 61 and a screw member 71. The rubber-like elastic body 31 includes a protrusion-like centering part 41 which is brought into contact with an inner peripheral surface 51a of an outer peripheral side member 51, a bead-like seal 42 which is brought into contact with an end surface 71a of the screw member 71, and a lip-like seal 43 which is brought into contact with an end surface 61a of the engagement member 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seal for a joint that is assembled to a joint structure to provide a sealing function.

  For example, a washer-like rubber-only type seal is used for a joint structure between a washing machine and a water supply hose.

  FIG. 3 shows the prior art of this kind of seal for joints, in which the engaging member 61 engaged with the step-like engaging portion 52 provided on the inner peripheral surface 51a of the outer peripheral side member 51 in the joint structure; A seal 81 is attached between a screw member 71 provided on the inner peripheral surface 51a of the member 51 and a screw member 71 engaged with the screw portion 71. The seal 81 is a washer-like packing having a rectangular cross section.

JP, 2011-252577, A

  However, the above prior art is required to be further improved in the following points.

  That is, at the time of assembly of the joint structure, the seal 81 is gradually tightened by rotating the outer peripheral side member 51 and screwing the screw member 71 into the outer peripheral side member 51, but in the above prior art, the seal 81 is a rubber only type. Therefore, it is difficult for the user to feel if the seal 81 is assembled in a properly crushed state. Therefore, if the crush condition is too small, the sealability will be impaired, and if the crush condition is too much, over-compression of the rubber, rubber cracking and the like will occur.

  Further, since the seal 81 made of an annular packing is in contact with the inner peripheral surface 51a of the outer peripheral side member 51 over the entire outer peripheral surface, positioning in the radial direction with respect to the outer peripheral side member 51 is performed on the entire outer peripheral surface. It will be Therefore, at the time of assembly, there is no escape space for rubber and the insertion load is large, so the seal 81 is difficult to be assembled.

  SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a seal for a joint which is easy to set the seal in a properly crushed state at the time of screwing, and is also excellent in terms of assemblability and sealability.

  In order to solve the above-mentioned subject, the seal for joints of the present invention comprises: an engaging member engaged with a step-like engaging portion provided on an inner peripheral surface of an outer peripheral side member in a joint structure; and an inner periphery of the outer peripheral side member A seal for a joint mounted between a screw member screwed to a screw provided on a surface, comprising a reinforcing ring and a rubber-like elastic body attached to the reinforcing ring, the reinforcing ring Has a flange portion sandwiched between the engagement member and the screw member, and the rubber elastic body is provided with a projecting centering portion in contact with the inner peripheral surface of the outer peripheral member; It has a bead-like seal part which contacts an end face part, and a lip-like seal part which contacts an end face part of the engaging member.

  As an embodiment, in the seal for a joint described above, the joint seal is used in a joint structure for connecting a pipe to a valve body via a union nut and a joint member, and the outer peripheral side member is the union It is characterized in that it is used as a nut, the engaging member is used as the joint member, and the screw member is used as the valve body.

  In the present invention, the joint seal has a reinforcing ring and a rubber-like elastic body, and the reinforcing ring has a flange portion, and the flange portion is sandwiched between the engaging member and the screw member. The flange portion is clamped in the process of screwing the screw member into the member. Therefore, since the screw tightening limit can be easily understood by hand, it is possible to prevent the occurrence of over-compression and rubber over-compression and rubber cracking.

  In addition, since the joint seal contacts the inner peripheral surface of the outer peripheral side member with the protruding centering portion, the assemblability can be improved, and a bead-shaped sealing portion and a lip-shaped sealing portion are provided. Therefore, the sealability can be improved.

Sectional drawing which shows the assembly state of the seal for joints which concerns on embodiment of this invention Half cut sectional view showing the seal for the joint in a single item Sectional drawing which shows the assembly state of the seal for joints which concerns on a prior art

  As shown in FIG. 1, the joint seal 11 according to the embodiment is engaged with a step-like engaging portion 52 provided on the inner peripheral surface 51 a of the outer peripheral side member 51 in the joint structure, and the outer peripheral side member 51 is An engaging member 61 positioned in the axial direction, and a screw member 71 screwed on a screw portion 53 provided on the inner peripheral surface 51 a of the outer peripheral side member 51 to make an axial distance between the engaging member 61 variable. Between the two.

  The joint seal 11 according to the embodiment is assembled in a joint structure in which a water supply hose from a water supply pipe is connected to a valve body of a water supply valve in a washing machine via a union nut and a joint member. The union nut, the joint member and the valve body in the structure correspond to the outer peripheral side member 51, the engagement member 61 and the screw member 71, respectively. The outer peripheral side member 51, the engagement member 61 and the screw member 71 are respectively molded of a predetermined resin material. Only a part of the screw member 71 is illustrated.

  As shown in FIG. 2, the joint seal 11 is configured by a combination of a metal reinforcing ring 21 and a rubber-like elastic body 31 attached (vulcanized and bonded) to the reinforcing ring 21.

  The reinforcing ring 21 has a cylindrical portion 22 disposed on the inner peripheral side of the screw member 71, and a flange extending radially outward from an end portion on one axial direction (upper side in the drawing) of the cylindrical portion 22. The part 23 is integrally formed. The cylindrical portion 22 is disposed on the inner peripheral side of the screw member 71 together with the rubber-like elastic body 31 attached thereto. The flange portion 23 is sandwiched between the engaging member 61 and the screw member 71 together with the rubber-like elastic body 31 attached thereto.

  The rubber-like elastic body 31 has a portion 32 attached to the outer peripheral surface of the cylindrical portion 22 of the reinforcing ring 21, a portion 33 attached to the distal end surface of the cylindrical portion 22, and an inner periphery of the cylindrical portion 22. The portion 34 attached to the surface, the portion 35 attached to one axial end face of the flange portion 23, the portion 36 attached to the outer peripheral surface of the flange portion 23, and the other of the flange portion 23 in the axial direction And a portion 37 attached to the end face (lower side in the figure).

  A protruding centering portion 41 protrudes radially outward at a portion 36 attached to the outer peripheral surface of the flange portion 23 and contacts the inner peripheral surface 51 a of the outer peripheral side member 51 with a predetermined interference amount. A plurality of circumferentially arranged equidistant configurations (for example, 5 equal distribution). Further, the protruding centering portion 41 is formed in a tapered surface in a direction in which the end surface 41a on the front side (one axial direction) in the assembling direction is tapered with the centering portion 41 directed radially outward. The end surface 41b on the rear side (the other in the axial direction) in the assembling direction is formed in a plane perpendicular to the axis.

  A bead-shaped seal portion 42 is provided on a portion 37 attached to the other axial end face of the flange portion 23 so as to project in the other axial direction and contact the end face 71a of the screw member 71 with a predetermined interference. ing.

  Further, a portion 35 attached to one end face in the axial direction of the flange portion 23 protrudes obliquely inward in the axial direction and inward in the radial direction, and is tightened to a predetermined end face portion 61 a of the engagement member 61 A lip-like seal portion 43 is provided which comes into contact with one another.

  In the joint seal 11 having the above configuration, the seal 11 is formed of a combination of a metal reinforcing ring 21 and a rubber-like elastic body 31 attached to the reinforcing ring 21. The flange portion 23 having a right-angled flat shape is provided, and the flange portion 23 is configured to be sandwiched between the end surface portion 61 a of the engagement member 61 and the end surface portion 71 a of the screw member 71. In the process of screwing in the member 71, the metal flange portion 23 is gradually pinched between the end surface portion 61 a of the engaging member 61 and the end surface portion 71 a of the screw member 71. Therefore, since the screw tightening limit can be easily understood by hand, it is possible to prevent the occurrence of over-compression and rubber cracking of the rubber-like elastic body 31 due to excessive tightening.

  Also, as a part of the rubber-like elastic body 31, a plurality of projecting centering portions 41 protruding radially outward and contacting the inner peripheral surface 51a of the outer peripheral side member 51 are arranged in a plurality on the circumference, equally distributed. Since the seal 11 is provided, when the seal 11 is assembled to the inner peripheral surface 51a of the outer peripheral side member 51, the seal 11 can be assembled coaxially with the outer peripheral side member 51, and furthermore, the protruding centering portion 41 Since a rubber relief space exists in the periphery (a space between the centering portions 41 adjacent to each other on the circumference, etc.), it is easily elastically deformed, and the insertion load is reduced accordingly. Therefore, the assemblability with respect to the outer peripheral side member 51 of the said seal 11 can be improved.

  Further, since the end surface 41a on the front side in the assembling direction of the centering portion 41 is formed into a tapered surface and the end surface 41b on the rear side in the assembling direction is formed into a plane perpendicular to the axis, the centering portion 41 is It is easy to fall to the side, and it is difficult to fall to the front side in the assembly direction. Therefore, also from this point, the assemblability of the seal 11 with respect to the outer peripheral side member 51 can be improved, and furthermore, the centering portion 41 engages with the screw portion 53 after assembly, so that assembly is easy (insertion is easy ) And it is possible to exert the effect that it is difficult to come off.

  Further, since a bead-like seal portion 42 which protrudes similarly to the other side in the axial direction and is in contact with the end face portion 71 a of the screw member 71 is also provided similarly as a part of the rubber elastic body 31, this bead-like seal portion As a result of the contact 42 with the end face 71a of the screw member 71, the seal surface pressure at this part is increased in comparison with the prior art. Therefore, the sealability between the seal 11 and the screw member 71 can be improved.

  Similarly, as a part of the rubber-like elastic body 31, there is provided a lip-like seal portion 43 which protrudes in one axial direction and radially inward and which is in contact with the end face portion 61a of the engagement member 61. Since the lip-like seal portion 43 comes into contact with the end face portion 61a of the engagement member 61, the self-sealing function peculiar to the lip seal is exerted when the pressure is applied. Therefore, the sealability between the seal 11 and the screw member 71 can be improved.

  Further, when pressure is applied to the lip-like seal part 43 from the inner peripheral side, the lip-like seal part 43 receives pressure and stands up, so that the seal 11 as a whole is displaced to the other in the axial direction. Is pressed strongly against the end face 71 a of the screw member 71. Therefore, since the self-sealing function exerted by the lip-like seal part 43 extends to the bead-like seal part 42 on the opposite side in the axial direction, further improvement of the sealability can be expected. In addition, according to the self-sealing function by the lip-like seal part 43, the bead-like seal part 42 is deformed and the contact surface pressure (seal surface pressure) of the bead-like seal part 42 against the screw member 71 is lowered. Even when the contact surface pressure (seal surface pressure) of the bead-like seal portion 42 against the screw member 71 is insufficient due to insufficient tightening of the outer peripheral side member 51 or the contact surface pressure (seal surface pressure) being lowered or insufficient Therefore, even from these points, further improvement in sealing performance can be expected.

DESCRIPTION OF SYMBOLS 11 Seal for joints 21 Reinforcing ring 22 Tubular part 23 Flange part 31 Rubber-like elastic body 32-37 Attached part 41 Protrusion-like centering part 41a, 41b End face 42 Bead-like seal part 43 Lip-like seal part 51 Outer periphery Side member (Union nut)
51a inner circumferential surface 52 engagement portion 53 thread portion 61 engagement member (joint member)
61a, 71a end face portion 71 screw member (valve body)

Claims (2)

Between the engaging member engaged with the step-like engaging portion provided on the inner peripheral surface of the outer peripheral side member in the joint structure and the screw member screwed with the screw portion provided on the inner peripheral surface of the outer peripheral side member A seal for a fitting attached to the
A reinforcing ring, and a rubber-like elastic body attached to the reinforcing ring,
The reinforcing ring has a flange portion sandwiched between the engagement member and the screw member,
The rubber-like elastic body includes a protruding centering portion in contact with the inner peripheral surface of the outer peripheral member, a bead-like seal portion in contact with the end surface portion of the screw member, and an end surface portion of the engaging member. A seal for a joint characterized by having a lip-like seal portion in contact therewith. In the joint seal according to claim 1,
The joint seal is used in a joint structure for connecting a pipe to a valve body via a union nut and a joint member.
The outer circumferential side member is used as the union nut.
The engagement member is used as the joint member.
The seal for a joint, wherein the screw member is used as the valve body.

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