JP2019074107A - Encapsulation structure for male screw member and female screw member, and encapsulation member - Google Patents

Abstract

To provide an encapsulation structure for a male screw member and a female screw member capable of obtaining a desired encapsulation function and preventing damage of an encapsulation member by appropriately setting a threading amount between a male screw of the male screw member and a female screw of the female screw member, and the encapsulation member.SOLUTION: The present invention relates to an encapsulation structure for a male screw member and a female screw member comprising: a male screw member 10 with which a male screw 12 is formed; a female screw member 20 with which a female screw 22 is formed; and an encapsulation member 30 for encapsulating connection parts of the male screw member and the female screw member when both the screw members are connected by threading the male screw and the female screw. The encapsulation structure for the male screw member and the female screw member is characterized in that the encapsulation member includes a large-diameter loop part 40 consisting of a relatively highly elastic material and a small-diameter loop part 50 consisting of a relatively lowly elastic material, and the small-diameter loop part is embedded in an inner peripheral surface of the large-diameter loop part.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a sealing structure and a sealing member for male and female screw members.

  Patent Document 1 discloses a seal member which is sandwiched between opposing end faces of two flow path pipes and seals a joint portion of the two flow path pipes. The seal member is made of a doughnut-shaped elastic material. The outer periphery of the seal member is provided with at least two protrusions that contact the inside of a cap nut which is a fastening member.

  Further, for example, at the connection portion between the washing machine and the water supply hose, a sealing structure for eliminating a water leak failure is provided. In this sealing structure, an external thread member having an external thread and an internal thread member having an internal thread are provided on one side and the other of the washing machine and the water supply hose, and the external thread and the internal thread are screwed together. A sealing member is provided to seal the connecting portion of the male screw member and the female screw member when the male screw member and the female screw member are connected. The sealing member is an integrally molded product (so-called rubber packing) having an annular portion made of a rubber material. The sealing member is housed in the housing portion communicating with the female screw of the female screw member, and when the male screw and the female screw are screwed to couple the male screw member and the female screw member, the tip of the male screw It exerts a sealing function by being pressed and crushed in contact with the

Japanese Patent Application Laid-Open No. 2004-60793

  However, in the above-described conventional sealing structure, when the screwing amount of the male screw and the female screw is too small, the compression amount of the sealing member is insufficient, and the desired sealing function can not be obtained. When the screwing amount of the screw and the female screw is too large, there is a problem that the amount of compression of the sealing member becomes excessive and the sealing member is broken. Especially in the latter case, the sealing member is permanently deformed by the force received from the tip of the male screw, and as a result, the amount of deformation of the sealing member exceeds a critical value and cracks occur. In addition, when a force in a bending direction or a twisting direction is repeatedly applied to the male screw member and the female screw member, local stress concentration may occur in the sealing member to cause breakage.

  The present invention has been made based on the above-mentioned awareness of the problem, and appropriately sets the screwing amount of the male screw of the male screw member and the female screw of the female screw member to obtain a desired sealing function and sealing An object of the present invention is to provide a sealing structure and a sealing member of an externally threaded member and an internally threaded member capable of preventing breakage of a locking member.

  In the sealing structure of the male screw member and the female screw member of the present embodiment, the male screw member having the male screw formed, the female screw member having the female screw formed, and the male screw and the female screw are screwed together And a sealing member for sealing a connecting portion of the male screw member and the female screw member when the male screw member and the female screw member are connected, and the sealing member is a sealing structure of the male screw member and the female screw member. A large diameter loop portion made of a relatively high elastic material and a small diameter loop portion made of a relatively low elastic material, and the small diameter loop portion is formed on the inner circumferential surface of the large diameter loop portion It is characterized by being buried.

  The large diameter loop portion may be made of a rubber material and / or a resin material, and the small diameter loop portion may be made of a metal material and / or a resin material.

  The small diameter loop portion may protrude inward from an inner circumferential surface of the large diameter loop portion.

  The large diameter loop portion and the small diameter loop portion may define an inner circumferential surface having the same diameter.

  The sealing member is housed in a housing portion communicating with the female screw of the female screw member, and when the male screw and the female screw are screwed to couple the male screw member and the female screw member. Alternatively, the large diameter loop portion may abut against the tip end portion of the male screw and be crushed inside the storage portion.

  The outer diameter of the large diameter loop portion is set to be larger than the inner diameter of the female screw, and the outer peripheral surface of the large diameter loop portion inserts the sealing member into the storage portion through the female screw. A tapered guide portion may be formed which is reduced in diameter toward the insertion direction of time.

  The outer peripheral surface of the large diameter loop portion is made continuous with the tapered guide portion to promote elastic deformation of the tapered guide portion when the sealing member is inserted into the storage portion through the female screw. A lightening portion may be formed as a relief for the thread of the female screw.

  The large diameter loop portion may be configured of a large diameter annular portion, and the small diameter loop portion may be configured of a small diameter annular portion.

  The large diameter loop portion may have a polygonal outer diameter portion and a circular inner diameter portion, and the small diameter loop portion may be formed of a small diameter annular portion.

  The sealing member of the present embodiment is a sealing member that seals the connecting portion of the male screw and the female screw when the male screw and the female screw are connected by connecting the male screw and the female screw. A large diameter loop portion made of an elastic material and a small diameter loop portion made of a relatively low elastic material are provided, and the small diameter loop portion is embedded in the inner circumferential surface of the large diameter loop portion. It is characterized by

  According to the present invention, it is possible to appropriately set the screwing amount of the male screw of the male screw member and the female screw of the female screw member to obtain a desired sealing function and to prevent breakage of the sealing member. The sealing structure and sealing member of a screw member and an internal thread member can be provided.

It is a perspective view which shows the disassembled state of a male screw member, a female screw member, and a sealing member. It is sectional drawing corresponding to FIG. 1 which shows the disassembled state of a male screw member, a female screw member, and a sealing member. It is a front view which shows the disassembled state of a male screw member, a female screw member, and a sealing member. It is sectional drawing corresponding to FIG. 3 which shows the disassembled state of a male screw member, a female screw member, and a sealing member. It is sectional drawing which shows the single-piece | unit structure of a sealing member. It is an enlarged view which shows the VI-VI part of FIG. It is a 1st process drawing when assembling a male screw member, a female screw member, and a sealing member. It is a 2nd process drawing when assembling a male screw member, a female screw member, and a sealing member. It is a 3rd process drawing when assembling a male screw member, a female screw member, and a sealing member. It is a figure which shows the modification of a large diameter loop part.

  The sealing structure and the sealing member 30 of the male screw member 10 and the female screw member 20 of the present embodiment will be described in detail with reference to FIGS. Hereinafter, the case where the sealing structure of this embodiment is applied to the connection part of a washing machine and the hose for water supply is illustrated and demonstrated.

  The male screw member 10 is attached to, for example, a washing machine (not shown). The male screw member 10 has a cylindrical main body 11 and a male screw 12 formed on the outer peripheral surface of the main body 11.

  The female screw member 20 is attached to, for example, a water supply hose (not shown). The female screw member 20 has a cylindrical main body 21, a female screw 22 formed on the inner peripheral surface of the main body 21, and a storage portion 23 communicating with the female screw 22 formed on the inner peripheral surface of the main body 21. doing.

  The male screw member 10 and the female screw member 20 are connected to each other by screwing the male screw 12 and the female screw 22. Thus, the washing machine and the water supply hose are connected, and water supply from the water supply hose to the washing machine becomes possible.

  The sealing member 30 seals the connection between the male screw 12 and the female screw 22 when the male screw 12 and the female screw 20 are connected to each other. Thereby, the water leak failure between the washing machine and the water supply hose is prevented.

  The sealing member 30 has a large diameter annular portion (large diameter loop portion) 40 made of a relatively high elastic material and a small diameter annular portion (small diameter loop portion) 50 made of a relatively low elastic material. ing. That is, the sealing member 30 is made of a dissimilar material packing (hybrid packing having a hybrid structure) in which different materials having different elasticity such as the large diameter annular portion 40 and the small diameter annular portion 50 are combined.

  The terms "high elasticity" and "low elasticity" are not intended to define the degree of elasticity of the large diameter annular portion 40 and the small diameter annular portion 50 by an absolute index, but the large diameter annular portion 40 and the small diameter annular ring It is used to indicate a relative index that the former's degree of elasticity is higher than the latter's degree of elasticity when comparing the degree of elasticity of the part 50.

  The large diameter annular portion 40 is made of, for example, a rubber material and / or a resin material (thermoplastic elastomer) (a single rubber material, a single resin material, or a combination of a rubber material and a resin material). As the rubber material, preferably, nitrile rubber (NBR), hydrogenated nitrile rubber (NBM / HNBR), fluororubber (FKM), perfluoropolyether rubber (FO), fluorosilicone rubber (FVMQ), silicone rubber ( Q) Epichlorohydrin rubber (CO), acrylic rubber (ACM), ethylene-propylene rubber (EPM), chloroprene rubber (CR), styrene-butadiene rubber (SBR), butyl rubber (IIR), natural rubber (NR), urethane rubber It is possible to select (U) or the like. As a resin material (thermoplastic elastomer), preferably, styrene-based TPE (SBC, TPS), olefin-based TPE (TPO), polyvinyl chloride-based TPE (TPVC), polyurethane-based TPE (TPU), polyester-based TPE (TPEE) , TPC), polyamide-based TPE (TPA, TPAE), polybutadiene-based TPE, and the like.

  The small diameter annular portion 50 is made of, for example, a metal material and / or a resin material (thermoplastic elastomer) (a single metal material, a single resin material, or a combination of a metal material and a resin material). As the metal material, in addition to stainless steel, it is possible to select a conventionally known metal that has been subjected to an anticorrosion treatment. As the resin material (thermoplastic elastomer), preferably, as a thermoplastic elastomer, for example, styrene TPE (SBC, TPS), olefin TPE (TPO), polyvinyl chloride TPE (TPVC), polyurethane TPE (TPEC) It is possible to select TPU), polyester TPE (TPEE, TPC), polyamide TPE (TPA, TPAE), polybutadiene TPE, and the like.

  The inner diameter of the small diameter annular portion 50 is set smaller than the inner diameter of the large diameter annular portion 40. The outer diameter of the small diameter annular portion 50 is set larger than the inner diameter of the large diameter annular portion 40 and smaller than the outer diameter of the large diameter annular portion 40. The small diameter annular portion 50 is embedded in the inner circumferential surface of the large diameter annular portion 40, and the small diameter annular portion 50 protrudes inward from the inner circumferential surface of the large diameter annular portion 40.

  The sealing member 30 is housed in the housing portion 23 communicating with the female screw 22 of the female screw member 20. The housing portion 23 has an annular groove 23A corresponding to the size of the sealing member 30 (large diameter annular portion 40) and a stopper wall 23B formed on the side of the female screw 22 of the annular groove 23A. In the free state, the outer diameter of the sealing member 30 (large diameter annular portion 40) is set to be slightly smaller than the inner diameter of the annular groove 23A. Therefore, in a state where the sealing member 30 is housed in the housing portion 23, the sealing member 30 (large diameter) is provided between the outer peripheral surface of the sealing member 30 (large diameter annular portion 40) and the inner peripheral surface of the annular groove 23A. A minute clearance is formed to secure the compression allowance of the annular portion 40) (FIG. 7, FIG. 8). Further, in the state where the sealing member 30 is stored in the storage portion 23, the stopper wall 23B is positioned directly on the upper surface of the outer peripheral side of the sealing member 30 (large diameter annular portion 40). It does not fall off from 23 (Figures 7 and 8).

  On the other hand, when the male screw 12 and the female screw 22 are screwed together to couple the male screw member 10 and the female screw member 20, the large diameter annular portion 40 abuts on the tip of the male screw 12 and is pushed inside the storage portion 23. It is crushed. Then, the crushed large diameter annular portion 40 enters a slight scratch, unevenness or pin hole of the storage portion 23 to connect the male screw member 10 and the female screw member 20 (connection between the washing machine and the water supply hose) Section is sealed.

  The outer diameter of the large diameter annular portion 40 is set to be larger than the inner diameter of the female screw 22 of the female screw member 20. Therefore, in order to insert the sealing member 30 into the housing 23 through the female screw 22, it is necessary to allow the female screw 22 to go over while elastically deforming the outer peripheral side portion of the large diameter annular portion 40. Therefore, in the present embodiment, the large diameter annular portion 40 is provided with a device for causing the female screw 22 to go over while elastically deforming the outer peripheral side portion of the large diameter annular portion 40.

  A tapered guide portion 41 is formed on the outer peripheral surface of the large diameter annular portion 40 so as to decrease in diameter in the insertion direction when the sealing member 30 is inserted into the storage portion 23 through the female screw 22. A pair of tapered guide portions 41 are provided on both sides in the axial direction of the large diameter annular portion 40 in order to be usable regardless of the direction of the large diameter annular portion 40 in the vertical direction (front and back direction). . Furthermore, on the outer peripheral surface of the large diameter annular portion 40, a continuous thin portion 42 is formed so as to be sandwiched between the pair of tapered guide portions 41 at the axial center of the large diameter annular portion 40. The lightening portion 42 promotes elastic deformation of the taper guide portion 41 when the sealing member 30 is inserted into the storage portion 23 through the female screw 22. Moreover, whenever the lightening part 42 gets over the thread of the internal thread 22 by the elastic deformation of the taper guide part 41, it becomes an escape place of the said thread.

  The male screw member 10, the female screw member 20, and the sealing member 30 are assembled as follows.

  First, the sealing member 30 is inserted into the housing 23 through the female screw 22. As shown in FIG. 7, the pressing jig 60 is held against the upper surface of the small diameter annular portion 50 projecting inward from the inner peripheral surface of the large diameter annular portion 40, and I will push it towards. Then, the tapered guide portion 41 of the large diameter annular portion 40 abuts on the female screw 22 and elastically deforms, thereby overcoming one of the screw threads of the female screw 22 and the screw thread which has run over escapes into the lightening portion 42. By repeating this operation, the tapered guide portion 41 and the thin portion 42 of the large diameter annular portion 40 cooperate with each other to ride over the thread of the female screw 22 one by one, and eventually, as shown in FIG. The stop member 30 is stored in the storage portion 23 of the female screw member 20. In this stored state, a compression margin of sealing member 30 (large diameter annular portion 40) is secured between the outer peripheral surface of sealing member 30 (large diameter annular portion 40) and the inner peripheral surface of annular groove 23A. A minute clearance is formed. Further, since the stopper wall 23B is positioned directly on the upper surface on the outer peripheral side of the sealing member 30 (large diameter annular portion 40), the sealing member 30 does not fall off from the storage portion 23.

  Then, as shown in FIG. 9, the male screw 12 and the female screw 22 are screwed together to couple the male screw member 10 and the female screw member 20. Then, the large diameter annular portion 40 abuts on the tip of the male screw 12 and is crushed inside the storage portion 23. Then, the crushed large diameter annular portion 40 enters a slight scratch, unevenness or pin hole of the storage portion 23, whereby the connection portion between the male screw member 10 and the female screw member 20 (connection of washing machine and water supply hose) Section is sealed.

  Here, the sealing member 30 is made of a relatively large elastic portion (a rubber material and / or a resin material) and a relatively low elasticity material (a metal material and / or a resin material). The small diameter annular portion 50 is embedded in the inner peripheral surface of the large diameter annular portion 40. Therefore, the volume of the large diameter annular portion 40 occupied in the sealing member 30 is reduced, and the embedding boundary surface between the large diameter annular portion 40 and the small diameter annular portion 50 acts to suppress the deformable amount of the large diameter annular portion 40 be able to. As a result, before the screwing amount of the male screw 12 and the female screw 22 becomes too large, the reaction force of the sealing member 30 rapidly increases and the further screwing of the male screw 12 and the female screw 22 is hindered Thus, it is possible to prevent the sealing member 30 from being broken (cracked) due to an excessive amount of compression (deformation amount) of the sealing member 30. In addition, even when a force in the bending direction or a twisting direction is repeatedly applied to the male screw member 10 and the female screw member 20, local stress concentration occurs in the sealing member 30 to cause breakage (cracks occur) ) Can be prevented.

  Although the case where the large diameter loop part was made into the large diameter annular part 40 was illustrated in the above embodiment, the large diameter loop part may have a shape having a polygonal outer diameter part and a circular inner diameter part. FIG. 10 shows a modified example in which the large diameter loop portion is configured as a modified loop portion 70 having a regular hexagonal outer diameter portion 71 and a circular inner diameter portion 72. The outer peripheral surface side of the small diameter annular portion 50 is embedded in the inner peripheral surface (inner diameter portion 72) of the deformed loop portion 70, and the inner peripheral surface side thereof is from the inner peripheral surface (inner diameter portion 72) of the deformed loop portion 70. It protrudes inward. When each apex (indicated by a black circle) of the regular hexagon of the outer diameter portion 71 of the deformed loop portion 70 is inserted into the storage portion 23 through the female screw 22, the deformed loop portion 70 (a combination of the small diameter annular portion 50) is inserted. , And abut against the female screw 22. On the other hand, each side of the regular hexagon of the outer diameter portion 71 of the deformed loop portion 70 is concerned when inserting the deformed loop portion 70 (a combination of the small diameter annular portion 50) into the storage portion 23 through the female screw 22. It does not abut on the female screw 22. In other words, using the gap between each side of the regular hexagon of the outer diameter portion 71 of the deformed loop portion 70 and the female screw 22, the deformed loop portion 70 (a combination of the small diameter annular portion 50) runs over the female screw 22. Is stored in the storage unit 23.

  Although the case where the sealing structure of an external thread member and an internal thread member was applied to the connection part of a washing machine and a water supply hose was illustrated and explained by the above embodiment, the external thread member and internal thread member of this embodiment The sealing structure of the present invention is applicable to any connection where a sealing structure is required to prevent water leak and gas leak.

  In the above embodiments, the inner diameter of the small diameter annular portion 50 is set smaller than the inner diameter of the large diameter annular portion 40, and the small diameter annular portion 50 is projected inwardly from the inner peripheral surface of the large diameter annular portion 40. Explained. However, the inner diameter of the large diameter annular portion 40 and the inner diameter of the small diameter annular portion 50 may be set to the same diameter, and the large diameter annular portion 40 and the small diameter annular portion 50 may form an inner circumferential surface having the same diameter. In this case, when the sealing member 30 is assembled to the female screw member 20, the pressing jig 60 pushes in the upper surface on the inner peripheral side of the large diameter annular portion 40. However, even if some cracks occur in the pressed portion of the large diameter annular portion 40, the sealing function of the sealing member 30 is guaranteed. This is because the upper surface on the inner peripheral side of the large-diameter annular portion 40 which is a pressing portion by the pressing jig 60 does not affect the sealing function of the sealing member 30.

  In the above embodiment, the stopper wall 23B is formed by setting the inner diameter of the annular groove 23A to be larger than the inner diameter of the female screw 22, and the stopper wall 23B functions to prevent falling off of the sealing member 30 stored in the storage portion 23. Was responsible for However, the stopper wall 23B may be omitted by setting the inner diameter of the annular groove 23A equal to or slightly larger than the inner diameter of the female screw 22. Even in this case, since the outer diameter of the large diameter annular portion 40 is set larger than the inner diameter of the female screw 22 of the female screw member 20, the sealing member 30 stored in the storage portion 23 You will not fall through.

DESCRIPTION OF SYMBOLS 10 male screw member 11 main body 12 male screw 20 female screw member 21 main body 22 female screw 23 accommodation part 23A annular groove 23B stopper wall 30 sealing member (hybrid packing)
40 Large diameter annular part (large diameter loop part)
41 taper guide portion 42 lightening portion 50 small diameter annular portion (small diameter loop portion)
60 Push-in jig 70 Uneven loop (large diameter loop)
71 regular hexagonal outer diameter 72 circular inner diameter

Claims (10)

An external thread member formed with an external thread;
A female screw member formed with a female screw;
A sealing member for sealing a connecting portion of the male screw and the female screw when the male screw and the female screw are connected by screwing the male screw and the female screw;
A sealing structure for male and female screw members having
The sealing member has a large diameter loop portion made of a relatively high elastic material and a small diameter loop portion made of a relatively low elastic material, and the inner circumferential surface of the large diameter loop portion The small diameter loop portion is embedded,
Sealing structure of an external thread member and an internal thread member characterized by things. The large diameter loop portion is made of a rubber material and / or a resin material, and the small diameter loop portion is made of a metal material and / or a resin material.
The sealing structure of the male screw member and female screw member according to claim 1. The small diameter loop portion projects inward from the inner circumferential surface of the large diameter loop portion.
A sealing structure of the externally threaded member and the internally threaded member according to claim 1 or 2. The large diameter loop portion and the small diameter loop portion define an inner circumferential surface having the same diameter,
A sealing structure of the externally threaded member and the internally threaded member according to claim 1 or 2. The sealing member is housed in a housing portion communicating with the female screw of the female screw member, and when the male screw and the female screw are screwed to couple the male screw member and the female screw member. And the large diameter loop portion abuts on the tip end portion of the male screw and is crushed inside the storage portion.
A sealing structure of the male screw member and the female screw member according to any one of claims 1 to 4, characterized in that: The outer diameter of the large diameter loop portion is set to be larger than the inner diameter of the female screw, and the outer peripheral surface of the large diameter loop portion inserts the sealing member into the storage portion through the female screw. A tapered guide portion is formed which is reduced in diameter toward the time of insertion direction,
A sealing structure of the male screw member and the female screw member according to claim 5. The outer peripheral surface of the large diameter loop portion is made continuous with the tapered guide portion to promote elastic deformation of the tapered guide portion when the sealing member is inserted into the storage portion through the female screw. A lightening portion is formed as a relief for the thread of the female screw.
A sealing structure of the male screw member and the female screw member according to claim 6. The large diameter loop portion is composed of a large diameter annular portion, and the small diameter loop portion is composed of a small diameter annular portion.
A sealing structure of the male screw member and the female screw member according to any one of claims 1 to 7, characterized in that: The large diameter loop portion has a polygonal outer diameter portion and a circular inner diameter portion, and the small diameter loop portion is formed of a small diameter annular portion.
A sealing structure of the male screw member and the female screw member according to any one of claims 1 to 7, characterized in that: A sealing member for sealing a connecting portion of an external thread and a female thread when the external thread and the internal thread are connected by screwing the external thread and the internal thread,
A large diameter loop portion made of a relatively high elastic material and a small diameter loop portion made of a relatively low elastic material, and the small diameter loop portion being embedded in the inner circumferential surface of the large diameter loop portion Being
A sealing member characterized by

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