Conversion adapter

Abstract

To provide a conversion adapter easily coping with a pipe joint having a different configuration.SOLUTION: A conversion adapter 1 includes a cylindrical part 2 to be inserted into a joint part 11 provided in a pipe joint 10C, and a body part 3 connected to the cylindrical part 2 and configured differently from the joint part. The peripheral surface of the cylindrical part 2 is annularly provided with a first engaging groove 4a engaged due to insertion of a pipe slip-off prevention lock ring 12 provided in the joint part, and a seal surface 5 contacted with a pipe sealing seal ring 13 provided in the joint part. The conversion adapter includes a spacer 6A separated from the cylindrical part and the body part. The spacer is interposed between the pipe joint, and contacts and regulates an insertion position of the cylindrical part into the joint part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a conversion adapter used for converting the structure of a pipe joint. [Background technology]

[0002] Patent Document 1 discloses a joint for converting a pipe from an outer surface seal structure to an inner surface seal structure. Another such joint is the conversion adapter shown in Non-Patent Document 1 (e.g., "HJS type conversion adapter"). This conversion adapter can be used with the first pipe joint in Non-Patent Document 2 (e.g., "WH type double lock header") and the second pipe joint in Non-Patent Document 3 (e.g., "AE type header").

[0003] 4 shows the state in which the conversion adapter 101 of Non-Patent Document 1 is used with the first pipe joint 10A of Non-Patent Document 2. The first pipe joint 10A has a joint part 11 at its end for connecting a resin pipe (not shown). The joint part 11 has a known one-touch joint structure and has a lock ring 12 and a seal ring 13.

[0004] The metal lock ring 12 bites into the outer circumferential surface of the resin pipe inserted into the joint portion 11 to prevent the resin pipe from coming loose. The seal ring 13 abuts against the outer circumferential surface of the resin pipe to ensure watertightness between the first pipe joint 10A and the resin pipe, and two seal rings 13 are provided along the insertion direction of the resin pipe (left-right direction on the paper). The two seal rings 13 are disposed on the inner side of the joint portion 11 relative to the lock rings 12. The inner circumferential surface of the first pipe joint 10A is reduced in diameter on the inner side of the joint portion 11 relative to the seal rings 13, and an abutment surface 14 is formed to abut and regulate the insertion position of the resin pipe.

[0005] The conversion adapter 101 includes a cylindrical portion 2 for insertion into a joint portion 11 of the first pipe joint 10A, and a main body portion 3 connected to the cylindrical portion 2 and having a joint structure different from that of the joint portion 11. The cylindrical portion 2 and the main body portion 3 are made of metal such as brass or bronze. The main body portion 3 has an outer diameter larger than that of the cylindrical portion 2, and is provided with a seal surface 3b on its inner circumferential surface. A plug 20 having a seal ring 20b on its outer circumferential surface is inserted and connected to the main body portion 3. The plug 20 is prevented from coming off the conversion adapter 101 by clamping a flange 20a of the plug 20 and a flange 3a of the main body portion 3 with a quick fastener 21.

[0006] The conversion adapter 101 is inserted into the first pipe fitting 10A to a position where the main body 3 abuts against the open end face 15 of the fitting part 11. The tip 2a of the tubular part 2 has tapered surfaces formed on the outer and inner peripheral surfaces, and becomes thinner toward the tip. In the insertion direction of the tubular part 2, the tip of the tubular part 2 is located between the seal ring 13 on the far side of the first pipe fitting 10A and the abutment surface 14.

[0007] A first engagement groove 4a, a second engagement groove 4b, and a seal surface 5 are each provided annularly in the circumferential direction on the outer peripheral surface of the cylindrical portion 2. The first engagement groove 4a, the second engagement groove 4b, and the seal surface 5 are positioned in this order from the main body 3 side toward the tip of the cylindrical portion 2. A lock ring 12 of the first pipe fitting 10A is engaged with the second engagement groove 4b to prevent the conversion adapter 101 from coming off. Two seal rings 13 of the first pipe fitting 10A come into contact with the seal surface 5 to ensure watertightness between the pipe fitting 10A and the conversion adapter 101.

[0008] As described above, by inserting the conversion adapter 101 into the first pipe fitting 10A and abutting the main body 3 against the opening end face 15 of the fitting portion 11, the lock ring type fitting portion 11 is converted into a quick fastener type fitting structure using the main body portion 3.

[0009] 5 shows the state in which the conversion adapter 101 of Non-Patent Document 1 is used with the second pipe fitting 10B of Non-Patent Document 3. Like the first pipe fitting 10A, the second pipe fitting 10B is a one-touch type pipe fitting equipped with a lock ring 12 and a seal ring 13, and has a substantially cylindrical outer tube portion 16 and an inner tube portion 17 formed inside the outer tube portion 16, between which a resin pipe is inserted.

[0010] An insertion guide 18 is disposed between the outer tube portion 16 and the inner tube portion 17, and is pressed against the tip of the resin pipe to guide the insertion of the resin pipe. On the inner side of the joint portion 11, the outer tube portion 16 and the inner tube portion 17 are connected to form an abutment surface 14 for abutting and regulating the insertion position of the insertion guide 18. The insertion guide 18, pressed against the tip of the resin pipe, abuts against the abutment surface 14, thereby defining the insertion position of the resin pipe into the second pipe joint 10B.

[0011] The second pipe fitting 10B has a different configuration from the first pipe fitting 10A, and the distance from the opening end face 15 of the fitting part 11 to the lock ring 12 is shorter than the distance in the first pipe fitting 10A. Therefore, when the conversion adapter 101 is inserted into the second pipe fitting 10B and the main body part 3 is abutted against the opening end face 15 of the fitting part 11, the lock ring 12 is engaged with the first engagement groove 4a of the conversion adapter 101.

[0012] In other words, the conversion adapter 101 is provided with the first engagement groove 4a and the second engagement groove 4b, and is therefore compatible with the first pipe joint 10A and the second pipe joint 10B which are configured differently from each other. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] JP 2007-51699 A [Non-patent literature]

[0014] [Non-Patent Document 1] Internet (Onda Manufacturing's digital catalogue)<URL:https: / / www.catalabo.org / iportal / cv.do?c=53355740000&pg=73&v=CATALABO&d=link> [Non-Patent Document 2] Internet (Onda Manufacturing's digital catalogue)<URL:https: / / www.catalabo.org / iportal / cv.do?c=53355740000&pg=62&v=CATALABO&d=link> [Non-Patent Document 3] Internet (Onda Manufacturing's digital catalogue)<URL:https: / / www.catalabo.org / iportal / cv.do?c=53355740000&pg=65&v=CATALABO&d=link> [Non-Patent Document 4] Internet (Onda Manufacturing's digital catalogue)<URL:https: / / www.catalabo.org / iportal / cv.do?c=53355740000&pg=120&v=CATALABO&d=link> Summary of the Invention [Problem to be solved by the invention]

[0015] However, when the conversion adapter 101 is used with another pipe fitting having a fitting portion with a different configuration from the first pipe fitting 10A and the second pipe fitting 10B, the positional relationship between the lock ring of the fitting portion and the first engagement groove 4a and the second engagement groove 4b of the tubular portion 2 and / or the positional relationship between the seal ring of the fitting portion and the seal surface 5 of the tubular portion 2 may be significantly misaligned in the axial direction of the tubular portion 2. Therefore, it may not be possible to achieve a suitable engagement relationship between the lock ring and the first engagement groove 4a or the second engagement groove 4b, or a suitable contact relationship between the seal ring and the seal surface 5.

[0016] For example, FIG. 6 shows a state in which the conversion adapter 101 of Non-Patent Document 1 is used with the one-touch type third pipe joint 10C (e.g., "socket") of Non-Patent Document 4. When the conversion adapter 101 is used with the third pipe joint 10C, which has a different configuration from the first pipe joint 10A and the second pipe joint 10B, the lock ring 12 is engaged with the first engagement groove 4a, while the second engagement groove 4b is disposed at the position of the seal ring 13 on the lock ring 12 side out of the two seal rings 13, and the pipe seal function is impaired. Therefore, for the third pipe joint 10C, it was necessary to separately prepare another conversion adapter from which, for example, the engagement groove 4b is deleted.

[0017] Furthermore, if the conversion adapter 101 (cylindrical portion 2) is made of a soft resin, the lock ring 12 can be inserted into the cylindrical portion 2, and the conversion adapter 101 can be prevented from slipping out of the pipe fitting even without providing the first engagement groove 4a or the second engagement groove 4b.

[0018] However, it is difficult to make the lock ring 12 bite into the conversion adapter 101 (cylindrical portion 2) made of metal or hard resin. Therefore, it is necessary to adopt a configuration in which the engagement grooves 4a, 4b are provided in the cylindrical portion 2 and the lock ring 12 is inserted into the engagement grooves 4a, 4b.

[0019] An object of the present invention is to provide a conversion adapter that can be easily adapted to other pipe joints. [Means for solving the problem]

[0020] In order to achieve the above-mentioned object, the invention of claim 1 is a conversion adapter comprising a tubular portion for insertion into a joint portion of a pipe fitting, and a main body portion connected to the tubular portion and having a configuration different from that of the joint portion, wherein the tubular portion has on its peripheral surface an engagement groove into which a lock ring for preventing the pipe from slipping out of the joint portion enters and engages, and a seal surface with which a seal ring for sealing the pipe of the joint portion comes into contact, each of which is provided in an annular shape in the circumferential direction, and the conversion adapter further comprises a spacer separate from the tubular portion and the main body portion, and the spacer is interposed between the pipe fitting and abuts and determines the insertion position of the tubular portion relative to the joint portion.

[0021] The invention of claim 2 is the same as claim 1, in which an abutment surface for abutting and determining the insertion position of the pipe is formed on the inner surface of the pipe fitting, and the spacer has a small diameter portion inserted into the cylindrical portion and a large diameter portion interposed between the tip of the cylindrical portion and the abutment surface.

[0022] The invention of claim 3 is related to claim 1, wherein the spacer is interposed between the main body and the open end face of the pipe joint. The invention of claim 4 is related to claim 3, wherein the spacer has an annular shape into which the tubular portion is inserted, and two corners located on the inner peripheral side of the spacer are chamfered so that the chamfer is longer in the radial direction than in the axial direction. Effect of the Invention

[0023] The conversion adapter of the present invention includes a spacer that is separate from the tubular portion and the main body. Therefore, even if the positional relationship between the lock ring of the joint portion and the engagement groove of the tubular portion and / or the positional relationship between the seal ring of the joint portion and the seal surface of the tubular portion is significantly shifted in the axial direction of the tubular portion, the insertion position of the tubular portion relative to the pipe joint can be changed to a suitable position by interposing the spacer. In other words, the conversion adapter can be easily adapted to another pipe joint by attaching and detaching the spacer. [Brief description of the drawings]

[0024] [Figure 1]FIG. 4 is a vertical cross-sectional view showing a state in which the conversion adapter of the first embodiment is connected to a third pipe joint. [Diagram 2] FIG. 11 is a longitudinal cross-sectional view showing a state in which the conversion adapter of the second embodiment is connected to a third pipe joint. [Diagram 3] FIG. 11 is a longitudinal cross-sectional view showing a state in which the conversion adapter of the third embodiment is connected to a third pipe joint. [Figure 4] FIG. 11 is a vertical cross-sectional view showing a state in which a conventional conversion adapter is inserted into a first pipe joint. [Diagram 5] FIG. 11 is a vertical cross-sectional view showing a state in which a conventional conversion adapter is inserted into a second pipe joint. [Figure 6] FIG. 11 is a vertical cross-sectional view showing a state in which a conventional conversion adapter is inserted into a third pipe joint. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, first to third embodiments of the present invention will be described. (First embodiment) As shown in Fig. 1, a conversion adaptor 1 has the same configuration as a conventional conversion adaptor 101, except that it is provided with a spacer 6A. The spacer 6A is provided separately from the cylindrical portion 2 and the main body portion 3, has an annular shape, and is interposed between the tip portion 2a of the cylindrical portion 2 and the contact surface 14 of the pipe joint 10C.

[0026] The spacer 6A has a small diameter portion 6a formed at an end portion thereof that contacts the cylindrical portion 2, and a large diameter portion 6b formed at an end portion thereof that contacts the contact surface 14. The outer peripheral surface of the small diameter portion 6a has a shape that follows the inner peripheral surface of the tip portion 2a of the cylindrical portion 2. The large diameter portion 6b has an outer diameter that is larger than the inner diameter of the cylindrical portion 2 and smaller than the outer diameter of the cylindrical portion 2.

[0027] The spacer 6A has a small diameter portion 6a press-fitted into the inside of the tip 2a of the cylindrical portion 2, and a large diameter portion 6b interposed between the tip 2a of the cylindrical portion 2 and the abutment surface 14. When the cylindrical portion 2 is inserted into the joint portion 11, the tip of the cylindrical portion 2 abuts against the large diameter portion 6b, so that the insertion position into the joint portion 11 is determined by the abutment. As a result, the lock ring 12 is shifted toward the opening end surface 15 compared to when the spacer 6A is not present, and is suitably engaged with the first engagement groove 4a, and both of the two seal rings 13 are suitably contacted with the seal surface 5. do.

[0028] The above-described first embodiment has the following effects. (1) The conversion adapter 1 includes a spacer 6A separate from the cylindrical portion 2 and the main body 3. Therefore, even if the positional relationship between the lock ring 12 of the joint portion 11 and the engagement grooves 4a, 4b of the cylindrical portion 2 and / or the positional relationship between the seal ring 13 of the joint portion 11 and the seal surface 5 of the cylindrical portion 2 in the third pipe joint 10C is significantly shifted in the axial direction of the cylindrical portion 2 with respect to the first pipe joint 10A and the second pipe joint 10B (FIGS. 4 and 5), the insertion position of the cylindrical portion 2 relative to the third pipe joint 10C can be changed to a suitable position by interposing the spacer 6A. In other words, the conversion adapter 1 can be adapted to pipe joints of various configurations by attaching and detaching the spacer 6A.

[0029] (2) The spacer 6A is formed with a small diameter portion 6a that can be inserted into the cylindrical portion 2. Therefore, when inserting the conversion adapter 1 into the pipe fitting 10C, the spacer 6A can be inserted into the cylindrical portion 2 as a single unit. This makes it easy to interpose the spacer 6A between the pipe fitting 10C and the conversion adapter 1.

[0030] (3) The spacer 6A is inserted inside the third pipe fitting 10C and is therefore not visible after it is attached to the third pipe fitting 10C. Therefore, after the conversion adapter 1 is attached to the pipe fittings 10A to 10C, it is possible to prevent the conversion adapter 1 from being forcibly pulled out of the pipe fittings 10A to 10C on the assumption that the spacer 6A is not attached. Furthermore, it is possible to prevent the conversion adapter 1 from being reinserted into the pipe fittings 10A to 10C in a state in which the lock ring 12 has been deformed by pulling out the conversion adapter 1 and the anti-detachment function has been lost.

[0031] Second Embodiment In this embodiment, the configuration (shape and mounting position) of the spacer 6A is changed to form a spacer 6B, as shown in Fig. 2. Note that a description of the same configuration as in the first embodiment will be omitted.

[0032] 2, the spacer 6B has an annular shape and a rectangular cross section, and is interposed between the main body 3 of the conversion adapter 1 and the open end surface 15 of the pipe fitting 10C. The cylindrical portion 2 is inserted into the pipe fitting 10C through the spacer 6B.

[0033] In the above-described second embodiment, in addition to providing the same effect as that of (1) of the first embodiment, the spacer 6B is disposed outside the pipe fitting 10C, and therefore, the presence of the spacer 6B can be visually confirmed even after attachment to the pipe fitting 10C.

[0034] (Third embodiment) FIG. 3 shows a third embodiment. This embodiment is a modification of the spacer 6B of the second embodiment (referred to as "spacer 6C"). In the spacer 6C, all of the four corners 6c, 6d on the inner and outer circumferences of the spacer 6B are chamfered. The chamfered angle of the two corners 6c located on the outer circumference side is 45 degrees (so-called C chamfer). The chamfered angle of the two corners 6d located on the inner circumference side is less than 45 degrees (preferably 20 degrees to 40 degrees, more preferably 25 degrees to 35 degrees). Therefore, the chamfered angle of the two corners 6d located on the inner circumference side is longer in the radial direction (up-down direction in the drawing) than in the axial direction (left-right direction in the drawing). Therefore, the spacer 6C can appropriately avoid the curved surface located at the boundary between the cylindrical part 2 and the main body part 3 in the conversion adapter 1 by chamfering the corners 6d located on the inner circumference side while suppressing rattling on the cylindrical part 2 by reducing the inner diameter to near the outer diameter of the cylindrical part 2. In addition, since the spacer 6C has two corners 6d located on the inner circumference chamfered, it is possible to eliminate any directional consideration when inserting the tubular portion 2, and it is also possible to prevent the sealing surface 5 of the tubular portion 2 from being rubbed against the corners 6d and damaged when the tubular portion 2 is inserted.

[0035] (Other Examples) The above-described embodiment can be modified, for example, as follows. The spacer 6B in the second embodiment or the spacer 6C in the third embodiment can be a C-ring. In this case, the spacers 6B and 6C can be attached even when the cylindrical portion 2 is inserted into the pipe joint 10C.

[0036] The conversion adapter 1 has one engagement groove, and a spacer separate from the spacers 6A to 6C is used to accommodate the first pipe fitting 10A or the second pipe fitting 10B.

[0037] A plurality of spacers 6A to 6C may be used. By combining a plurality of spacers 6A to 6C, it is possible to accommodate other pipe joints. In this case, the spacers 6A to 6C may have different thicknesses.

[0038] Conversion adapter 1 must be made of hard resin.

[0039] The main body 3 of the conversion adapter 1 is configured as a sealing plug for watertightness.

[0040] The main body 3 of the conversion adapter 1 is configured for size conversion as a one-touch joint structure with a nominal diameter different from that of the joint 11.

[0041] The main body 3 of the conversion adapter 1 is configured as an elbow joint for changing the flow direction.

[0042] The main body 3 of the conversion adapter 1 is configured as a branch joint having multiple connection ports.

[0043] The main body 3 of the conversion adapter 1 is configured for screw connection.

[0044] The main body 3 of the conversion adapter 1 is configured for pipe type conversion by having a joint structure that is compatible with a pipe type different from the plastic pipe to be connected to the joint part 11.

[0045] The main body 3 of the conversion adapter 1 is configured to be equipped with a valve.

[0046] The main body 3 of the conversion adapter 1 is configured as an intake valve for draining water. [Explanation of symbols]

[0047] 1...conversion adapter 2...cylindrical portion 3...main body portion 4a...first engagement groove 4b...second engagement groove 5...seal surface 6A, 6B, 6C...spacer 6a...small diameter portion 6b...large diameter portion 6c, 6d...angle 10...pipe joint 11...joint portion 12...lock ring 13...seal ring 14...contact surface 15...opening end surface

Claims

[Claim 1] A conversion adapter having a tubular portion for insertion into a joint portion of a pipe joint, and a main body portion connected to the tubular portion and having a joint configuration or a sealing plug configuration different from the joint portion, wherein an engagement groove into which a lock ring for preventing a pipe from slipping out of the joint portion is inserted and a seal surface with which a seal ring for sealing a pipe of the joint portion comes into contact are each provided annularly in the circumferential direction on the peripheral surface of the tubular portion, a spacer separate from the cylindrical portion and the main body portion; the spacer is interposed between the pipe joint and the tubular portion to abut against and define an insertion position of the tubular portion relative to the joint portion, The spacer is interposed between the main body and an open end surface of the pipe joint, the spacer has an annular shape into which the cylindrical portion is inserted, and two corners located on the inner circumferential side of the spacer are chamfered at the same angle such that the chamfer is longer in the radial direction than in the axial direction; two corners located on the outer periphery side of the spacer are chamfered at the same angle and larger than the two corners located on the inner periphery side; The spacer has no directionality when the cylindrical portion is inserted. Conversion adapter.

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