JP2023037212A - Seal structure - Google Patents

Abstract

To provide a compact seal structure which can secure sealability in a connection portion between a pipe body and an attachment part connected through a joint tool and absorb longitudinal displacement of the pipe body.SOLUTION: An insertion part 6A of a joint tool 6 penetrates through a pair of cylindrical seal bodies 1 formed of an elastic material and a cylindrical sleeve 5 in a state that the cylindrical sleeve 5 is sandwiched between the pair of seal bodies 1. A gap is formed between an inner peripheral surface of the sleeve 5 and an outer peripheral surface of the insertion part 6A. One end of a pipe body 4 is fixed to a fitting part 5b which penetrates through a peripheral wall of the sleeve 5. At each seal body 1, multiple annular hard bodies 2 arranged coaxially with the seal body 1 are embodied at intervals in a cylinder axis direction. Each seal body 1 is compressed in the cylinder axis direction between an end surface 7b of the attachment part 7 and a flange part 6b of the joint tool 6. Each passage 4a, 6a, 7a communicate through a passage 5a of the sleeve 5. Longitudinal displacement of the pipe body 4 is absorbed by elastic deformation of the seal bodies 1 caused by radial shearing deformation of each annular elastic part 3 between the annular hard bodies 2.SELECTED DRAWING: Figure 8

Description

TECHNICAL FIELD The present invention relates to a seal structure, and more particularly, to prevent displacement in the longitudinal direction of a tubular body while ensuring sealing performance at a connecting portion between a tubular body and a mounting portion that are connected via a joint tool. It relates to a compact seal structure that can absorb.

Piping is used in connection with various objects. 2. Description of the Related Art Various seal structures have been proposed for connecting a pipe to an object while securing sealing performance at a connecting portion between the pipe and the object (see, for example, Patent Document 1). In the seal structure described in FIG. 10 of Patent Literature 1, pipes are inserted through a penetrating sleeve penetrating the wall of the building. A seal device for fixing the pipe to the wall is protruded from the outdoor side of the wall while covering the outer peripheral side of the pipe. This sealing device has a laminated rubber flange consisting of a cylindrical elastic ring coaxial with the pipe and a cylindrical reinforcing ring.

In this sealing device, each cylindrical elastic ring undergoes shear deformation and the laminated rubber flange elastically deforms, thereby absorbing displacement in the longitudinal direction of the pipe. This sealing device is premised on pipes that extend straight through the wall of the building, so it can be used when there is not enough space outside the building for this pipe to extend as it is. Can not. Therefore, there is room for improvement in absorbing the longitudinal displacement of the piping in a compact space.

JP 2014-92214 A

An object of the present invention is to provide a compact seal structure that can absorb displacement in the longitudinal direction of the tubular body while ensuring sealing performance at the connection portion between the tubular body and the mounting portion that are connected via a joint tool. is to provide

In order to achieve the above object, the seal structure of the present invention has a joint device for connecting a tubular body to a mounting portion, and the flow paths of the tubular body and the joint device are communicated with one end of the tubular body. is connected to the joint device, and the passages of the joint device and the mounting portion are communicated with each other so that the insertion portion of the joint device is inserted into the mounting portion and connected, wherein the cylindrical sleeve and and a pair of cylindrical seal bodies made of an elastic material, wherein the sleeve and the respective seal bodies are arranged on the same cylinder axis, and the seal bodies are arranged between the respective seal bodies. The insertion portion penetrates through the respective seal bodies and the sleeve in a state in which the sleeve is sandwiched, and a gap is formed between the inner peripheral surface of the sleeve and the outer peripheral surface of the insertion portion. The one end portion is fixed to a fitting portion formed by penetrating the peripheral wall of the sleeve, and a plurality of annular hard bodies coaxial with the respective seal bodies are attached to the respective seal bodies in the cylinder axis direction. and the insertion portion is inserted into and connected to the mounting portion so that each of the seal bodies sandwiching the sleeve is positioned between the end face of the mounting portion and the joint It is characterized in that it is in a state of being compressed in the cylinder axis direction between itself and the flange portion of the fitting, and the passages of the tubular body, the joint fitting, and the mounting portion communicate with each other through the sleeve. .

According to the present invention, each of the seal bodies sandwiching the sleeve is compressed in the cylinder axis direction between the end face of the mounting portion and the flange portion of the joint, Sufficient sealing performance can be ensured by the respective seal bodies at the connecting portions of the mounting portion, the joint tool, and the sleeve. When the tubular body is displaced in the longitudinal direction, the elastic material (annular elastic portion) present between the annular hard bodies embedded in the respective seal bodies shears and deforms. Since the seal body is elastically deformed, this displacement can be absorbed. Moreover, by using the joint tool, the extending direction of the tubular body becomes a direction substantially orthogonal to the flow path of the attachment portion. Therefore, this seal structure can be used even if there is not enough space outside the mounting portion in the extending direction of the flow path of the mounting portion.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which illustrates the seal structure of this invention by a longitudinal cross-sectional view. FIG. 2 is an explanatory diagram illustrating the seal structure of FIG. 1 in plan view; FIG. 2 is an explanatory view exemplifying a half of the seal body in FIG. 1 in a perspective view; FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; The sleeve of FIG. 1 is illustrated independently, FIG. 5 (a) is a longitudinal cross-sectional view, and FIG. 5 (b) is a side view. 1 alone, FIG. 6(a) is a vertical sectional view, and FIG. 6(b) is a BB sectional view of FIG. 6(a). FIG. 2 is an explanatory diagram illustrating a state in which a fluid is flowing in each channel of FIG. 1; FIG. 8 is an explanatory diagram illustrating a state in which the seal body in FIG. 7 is elastically deformed;

Hereinafter, the seal structure of the present invention will be described based on the embodiments shown in the drawings.

As illustrated in FIGS. 1-2, the embodiment of the seal structure includes a joint 6 that connects the tube 4 to a mounting portion 7 of various devices, such as hydraulic machines. One end of the tubular body 4 is connected to the joint tool 6 by connecting the flow paths 4a and 6a of the tubular body 4 and the joint tool 6, and the flow paths 6a and 7a of the joint tool 6 and the mounting portion 7 are connected to each other. The insertion portion 6A of the joint tool 6 is inserted into and connected to the attachment portion 7 so as to communicate with each other. Thereby, the respective flow paths 4a, 6a, 7a are communicated with each other. The fluid F flowing through the flow paths 4a, 6a, 7a may be liquid (various oils, chemicals, water, etc.) or gas (various gases, air, etc.).

This seal structure has a joint member 6, a tubular sleeve 5, and a pair of tubular seal bodies 1 made of an elastic material. The sleeve 5 and each seal body 1 are arranged on the same cylinder axis, and the sleeve 5 is sandwiched between each seal body 1 . An insertion portion 6A of a joint tool 6 penetrates through each of the seal body 1 and the sleeve 5. As shown in FIG.

The tubular body 4 may be a poorly flexible pipe made of metal, hard resin having extremely high flexural rigidity, or a composite material of these materials, or may be a highly flexible rubber hose. A dashed-dotted line CL in the drawing indicates an axis extending through the center of the cross section of the tubular body 4 . The extending direction of the dashed-dotted line CL is the longitudinal direction (axial direction) of the tubular body 4 . A dashed-dotted line Cx indicates the axial center of the flow path 7a. The dashed-dotted line Cx also indicates a cylinder axis (axial center) extending through the cross-sectional centers of the cylindrical seal body 1, the cylindrical sleeve 5, and the cylindrical insertion portion 6A. The extending direction of the dashed-dotted line Cx is the cylinder axis direction (axial direction) of the seal body 1, the sleeve 5, and the insertion portion 6A.

The seal body 1 is made of an elastic material. Various known vulcanized rubbers and elastomers can be used as the elastic material. In this embodiment, the inner peripheral surface of the seal body 1 is formed with a protruding portion 3a protruding radially inward. That is, the cylindrical seal body 1 has a projecting portion 3a made of an elastic material on its inner peripheral surface. The projecting portion 3a may have a ring shape that is continuous in the circumferential direction, or may be intermittently arranged in the circumferential direction. This projecting portion 3a can be arbitrarily provided as required.

As illustrated in FIGS. 1, 3, and 4, a plurality of annular hard bodies 2 coaxial with the seal body 1 are embedded in the seal body 1 at predetermined intervals g in the cylinder axis direction. Each annular hard body 2 is embedded in the seal body 1 so as not to be exposed to the outside of the seal body 1 . Therefore, the surface of the seal body 1 is an elastic material. The annular hard body 2 is harder and has higher rigidity (modulus) than the elastic material forming the seal body 1, and is made of various metals, hard resins, or the like. In this embodiment, all annular rigid bodies 2 are simple toric bodies and have the same thickness (wall thickness).

Although the number of annular hard bodies 2 is four in this embodiment, the number is determined appropriately within the range of 3 to 10, for example. The thickness (wall thickness) of the annular hard body 2 is, for example, about 0.1 mm to 1.0 mm. A predetermined distance g, which is the distance between the annular hard bodies 2 adjacent to each other in the axial direction, is, for example, 0.3 mm to 1.0 mm. Although the predetermined interval g is basically set to the same size at all positions, the size of the predetermined interval g can be varied depending on the position.

A cylindrical annular elastic portion 3 made of an elastic material forming the sealing member 1 is provided between the annular hard bodies 2 adjacent to each other in the cylinder axis direction. That is, the annular hard bodies 2 and the annular elastic parts 3 are alternately arranged in the axial direction of the seal body 1 . The thickness (wall thickness) of the annular elastic portion 3 is the size of the predetermined interval g. The pair of seal bodies 1 may have the same specifications or different specifications.

In order to manufacture this seal body 1, for example, a member corresponding to the seal body 1 is molded from unvulcanized rubber, and a molded body in which each annular hard body 2 is embedded in this member is molded. Then, this molded body is vulcanized by a known method. By vulcanizing the unvulcanized rubber, it becomes a vulcanized rubber which is an elastic material, and each annular hard body 2 is integrated with the elastic material (annular elastic portion 3) by vulcanization adhesion to form the seal body 1. is manufactured.

The sleeve 5 is made of various metals, hard resins, or the like. As exemplified in FIGS. 1 and 5, a cavity is formed inside the sleeve 5 and penetrates in the direction of the cylinder axis, and this cavity functions as a flow path 5a. A fitting portion 5 b extending radially through the peripheral wall of the sleeve 5 is formed at one location on the peripheral wall of the sleeve 5 . More specifically, a through hole communicating with a cavity (flow path 5a) inside the sleeve 5 is formed in the bottom surface of the fitting portion 5b of the circular recess. One end of the tubular body 4 is inserted into and fixed to the fitting portion 5b (strongly integrated in an airtight or watertight manner).

As illustrated in FIGS. 1 and 6, the joint tool 6 includes a cylindrical insertion portion 6A extending in the axial direction Cx and a flange portion 6b arranged at one end of the insertion portion 6A and having a larger diameter. and Inside the insertion portion 6A, a flow path 6a is formed that extends to the middle position of the joint tool 6 in the axial direction Cx. Further, a channel 6a is formed extending through the insertion portion 6A in the axial direction CL (a direction orthogonal to the axial direction Cx). Therefore, in the insertion portion 6A, the flow paths 6a intersect at right angles. The insertion portion 6A side of the flange portion 6b is an end face orthogonal to the insertion portion 6A.

Although the joint fitting 6 is a metal joint fitting in this embodiment, it is not limited to this and can be made of hard resin, for example. The joint member 6 is fixed to the flow path 7a of the mounting portion 7 by screwing.

In this seal structure, as illustrated in FIG. 1, the sleeve 5 and the respective seal bodies 1 are arranged on the same cylinder axis, and the sleeve 5 is sandwiched between the respective seal bodies 1. It's becoming The insert portion 6A penetrates through the seal body 1 and the sleeve 5, respectively. By inserting and connecting the insertion portion 6A into the flow path 7a of the attachment portion 7, the respective seal bodies 1 sandwiching the sleeve 5 are separated from the end face 7b of the attachment portion 7 and the flange portion 6b. It is in a state of being compressed in the cylinder axial direction (the axial direction Cx in FIG. 1) with the end face.

More specifically, in each of the compressed seal bodies 1, the respective annular elastic portions 3 are compressed in the direction of the cylinder axis, and one seal body 1 is in close contact with the end surface 7b of the mounting portion 7 and one side surface of the sleeve 5. . The other seal body 1 is in close contact with the end surface of the flange portion 6b and the other side surface of the sleeve 5. As shown in FIG. In addition, the inner peripheral surface (protruding portion 3a) of each seal body 1 is in close contact with the outer peripheral surface of the insertion portion 6a. A gap (filling space 6c) is formed between the inner peripheral surface of the sleeve 5 and the outer peripheral surface of the insertion portion 6A, and the sleeve 5 and the joint 6 are not in direct contact.

Since each seal body 1 is in airtight or watertight contact with the mounting portion 7, the joint device 6 and the sleeve 5, each seal body 1 Sufficient sealing performance (airtightness or watertightness) can be secured by In this state, the channels 4a, 6a and 7a communicate with each other through the sleeve 5 (channel 5a).

The seal body 1 has a laminated structure in which annular hard bodies 2 and annular elastic parts 3 are alternately arranged in the cylinder axis direction. Therefore, compared to the case where the annular hard body 2 is not embedded, the seal body 1 is pressed more strongly by the end face 7b of the mounting portion 7, the end face of the flange portion 6b, and both side faces of the sleeve 5 to be firmly attached. , which is advantageous for improving the sealing performance at the connecting portion.

In this embodiment, since the sealing body 1 is formed with the projecting portion 3a, a filling space 6c is formed between the inner peripheral surface of the sealing body 1 and the outer peripheral surface of the insertion portion 6A. Since this filling space 6c communicates with the channels 5a, 6a, all the channels 4a, 5a, 6a, 7a and the filling space 6c communicate with each other.

As illustrated in FIG. 7, in this seal structure, the fluid F flows through the respective flow paths 4a, 5a, 6a, and 7a, and the filling space 6c is filled with the fluid F. As shown in FIG. Therefore, in the radial direction, the seal body 1 is balanced by being pressed by the pressure of the fluid F on the inner peripheral surface and by the external air pressure on the outer peripheral surface.

As illustrated in FIG. 8, depending on the site of use, an external force that pulls the tubular body 4 in the longitudinal direction (axial direction) may act. When such an external force acts, an excessive load is applied to the tubular body 4, and the tubular body 4 is likely to come off, which is disadvantageous in maintaining the connection between the tubular body 4 and the joint member 6. However, in this seal structure, when such an external force acts on the tubular body 4, the sleeve 5 is pulled together with the tubular body 4, and the annular elastic portion 3 of each seal body 1 slightly moves in the radial direction. Shear deformation. Each seal body 1 elastically deformed by accumulating the shear deformation of each annular elastic portion 3 absorbs displacement of the tubular body 4 in the longitudinal direction.

As a result, the risk of excessive load being applied to the tubular body 4 can be reduced. In addition, at the connecting portion of the attachment portion 7, the joint tool 6 and the sleeve 5, the connection between the tubular body 4 and the attachment portion 7 via the joint tool 6 is maintained while ensuring sufficient sealing performance by the respective seal bodies 1. can do. When a metal pipe should be used as the tubular body 4, there is no need to change to a rubber hose to absorb the displacement of the tubular body 4, so there is an advantage that the metal pipe can be easily used.

In this embodiment, the fluid F is filled in the filling space 6c. Accordingly, as described above, in the radial direction, the inner peripheral surface of the seal body 1 is pressed toward the outer peripheral surface side, the outer peripheral surface is pressed toward the inner peripheral surface side, and the seal body 1 is pressed in both radial directions. Balanced. In the seal structure without the filling space 6c, the seal body 1 is only pressed toward the inner peripheral surface in the radial direction by the external air pressure acting on the outer peripheral surface. Therefore, the specification with the filling space 6c makes it easier to elastically deform the seal body 1 in the radial direction than the specification without the filling space 6c. Therefore, it is advantageous for the seal body 1 to absorb the displacement of the tubular body 4 pulled in the longitudinal direction.

As the number of annular elastic portions 3 is increased, the amount of elastic deformation of the seal body 1 can be increased. Therefore, when the displacement of the tubular body 4 in the longitudinal direction is large, the number of the annular elastic portions 3 should be increased (in other words, the number of the annular hard bodies 2 should be increased). That is, when the longitudinal displacement of the tubular body 4 is large, it is preferable to use a seal body 1 having a large number of annular elastic portions 3 (annular hard bodies 2).

Even if the fluid pressure of the fluid F increases, since each annular elastic portion 3 is sandwiched between the annular hard bodies 2, the deformation thereof is slight. is in favor. Therefore, the seal body 1 can sufficiently withstand high internal pressure. The smaller the predetermined distance g (thickness of the annular elastic portion 3) between the annular hard bodies 2, the more difficult it is for the annular elastic portion 3 to undergo shear deformation. Therefore, reducing the predetermined gap g is advantageous in suppressing damage to the annular elastic portion 3 caused by the fluid pressure of the fluid F. That is, when the fluid pressure of the fluid F is very high, it is preferable to use the seal body 1 with a small predetermined gap g in order to prevent the annular elastic portion 3 from being damaged.

By using this joint tool 6 , the extending direction of the tubular body 4 becomes a direction substantially perpendicular to the flow path 7 a of the mounting portion 7 . Therefore, this seal structure can be used even if there is not enough space outside the mounting portion 7 in the extending direction of the flow path 7a. As a result, it is advantageous to make the seal structure compact, and the longitudinal displacement of the tubular body 4 can be absorbed in a compact space.

When each of the annular hard bodies 2 is made of metal, it is advantageous to make the seal body 1 more strongly adhere to the end surface 7b of the mounting portion 7 and the side surface of the sleeve 5, and the end surface of the flange portion 6b and the side surface of the sleeve 5. Become. If each ring-shaped hard body 2 is made of resin, it is possible to prevent the ring-shaped hard body 2 from corroding and deteriorating, which is advantageous for reducing the weight of the seal structure.

The elastic material forming the seal body 1 may be of the same specification (kind) throughout the seal body 1 . That is, the seal body 1 may be made of one specification (one type) of elastic material, but the surface of the seal body 1 in contact with the fluid F should be made of an elastic material that is highly resistant to the fluid F. good. Moreover, the surface of the seal body 1 that contacts the outside air is preferably made of an elastic material that is highly resistant to the outside air. Therefore, in the seal body 1, the specifications (types) of the elastic material may be changed between the surface in contact with the fluid F and the other portions, or the specifications (kind) of the elastic material may be changed between the surface in contact with the outside air and the other portions. You can change it.

In this seal structure, the sleeve 5 fixed to the tubular body 4 and the joint member 6 are not in direct contact with each other, but the seal body 1 (elastic material) is interposed between them. Therefore, the vibration transmitted between the tubular body 4 and the mounting portion 7 is attenuated by the seal body 1 . If the tubular body 4 is made of metal, vibrations in the tubular body 4 may be regarded as a problem, but this seal structure is useful for solving such a problem.

1 Seal body 2 Annular hard body 3 Annular elastic part 3a Protruding part 4 Tubular body 4a Channel 5 Sleeve 5a Channel 5b Fitting part 6 Joint tool 6a Channel 6b Flange part 6c Filling space 7 Mounting part 7a Channel 7b End face F fluid

Claims (4)

It has a joint tool that connects the tubular body to the mounting part, and one end of the tubular body is connected to the joint tool by communicating the flow paths of the tubular body and the joint tool, and the joint tool and the joint tool are connected to the joint tool. In the seal structure in which the insertion portion of the joint tool is inserted into and connected to the mounting portion by communicating the flow paths with the mounting portion,
It has a cylindrical sleeve and a pair of cylindrical seal bodies made of an elastic material, the sleeve and the respective seal bodies being arranged on the same cylinder axis, and the respective seal bodies A gap is formed between the inner peripheral surface of the sleeve and the outer peripheral surface of the insertion portion as the insertion portion penetrates through the respective seal bodies and the sleeve with the sleeve sandwiched between them. and the one end is fixed to a fitting portion formed by penetrating the peripheral wall of the sleeve,
A plurality of annular hard bodies coaxial with the respective seal bodies are embedded in the respective seal bodies at intervals in the cylinder axis direction,
By inserting and connecting the insertion portion to the mounting portion, each of the seal bodies sandwiching the sleeve is positioned between the end surface of the mounting portion and the flange portion of the joint device. The seal structure is compressed in a direction, and the passages of the tubular body, the joint member, and the mounting portion communicate with each other through the sleeve. A protruding portion that protrudes toward the outer peripheral surface of the insertion portion is formed on the inner peripheral surface of each of the seal bodies. 2. The seal structure according to claim 1, wherein a filling space is formed between said outer peripheral surface and communicates with each of said flow paths to be filled with fluid flowing through each of said flow paths. 3. The seal structure according to claim 1, wherein each of said annular hard bodies is made of metal. 3. The seal structure according to claim 1, wherein each of said annular hard bodies is made of resin.

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