JP2019143735A - Piping connecting device - Google Patents

Abstract

To provide a piping connecting device which makes piping hardly rotate by, for example, screw fastening.SOLUTION: A piping connecting device comprises: piping having a housing which is opened at, for example, an outside opening, in which a recess formed of an inner face including an internal peripheral face and a bottom face surrounding an inside opening is formed, and which has a first screw, a flange accommodated in the recess, and hanging out to the outside of a radial direction, and a contact end face located at an end part in a longitudinal direction, and contacting with the bottom face; and a pressing member having an interposition component accommodated in the recess, surrounding the piping, and contacting with the flange at a side opposite to the bottom face, a second screw which is screwed with the first screw, and a pressing part which is insertable into the recess while surrounding the piping, rotating around the piping accompanied by the rotation of the second screw which is screwed with the first screw, and contacting with the interposition component at a side opposite to the flange. When the pressing part presses the interposition component while rotating, first friction torque between the pressing part and the interposition component is smaller than second friction torque between the interposition component and the flange.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a pipe connection device.

  2. Description of the Related Art Conventionally, there has been known a pipe connection device that attaches a pipe to a housing in a state where the end face of the pipe is pressed against the end face of the housing and is sealed by tightening a nut (for example, Patent Document 1).

JP 2002-130075 A

  In the pipe connection device of Patent Literature 1, when the pipe rotates with the rotation of the nut, there is a possibility that an inconvenient event may occur such that the pipe is twisted or a part away from the pipe housing interferes with other parts. There is.

  Therefore, one of the problems of the present invention is to obtain a pipe connection device in which the pipe is difficult to rotate by tightening screws, for example.

  The pipe connection device according to the present disclosure includes, for example, a recess that is formed by an inner surface including an inner peripheral surface and a bottom surface that surrounds the inner opening and opens at the outer opening, and includes a housing having a first screw and the recess. A pipe having a flange which is accommodated and projecting radially outward; a contact end face located at an end in a longitudinal direction and in contact with the bottom face; and is accommodated in the recess and surrounds the pipe. An intervening part that is in contact with the flange on the opposite side of the bottom surface, a second screw that meshes with the first screw, and a circumference of the pipe as the second screw surrounds and meshes with the first screw. A pressing member configured to be inserted into the recess while rotating and having a pressing portion in contact with the interposed component on the side opposite to the flange, and the interposed component is rotated while the pressing portion rotates. Press In case, the first friction torque between the pressing portion and the intervening part is smaller than the second frictional torque between the intervening part and the flange.

  According to such a configuration, for example, when the pressing member is tightened, it is possible to prevent the tightening torque from being transmitted to the piping by slipping between the pressing portion and the intervening component. Therefore, it is suppressed that piping rotates with rotation of a press member.

  In the pipe connection device, for example, the first friction coefficient in the circumferential direction of the rotation center of the pressing portion between the pressing portion and the interposed component is the circumferential direction between the interposed component and the flange. Less than the second coefficient of friction. According to such a configuration, the first friction torque can be made smaller than the second friction torque due to the difference in the friction coefficient. Therefore, for example, a structure that suppresses transmission of torque from the pressing member to the pipe can be realized with a relatively simple configuration.

  In the pipe connection device, for example, the second contact portion between the intermediate component and the flange is radially outward of the rotation center of the press portion than the first contact portion between the press portion and the intermediate component. It has the site | part located in. According to such a configuration, since the moment arm in the second contact portion is larger than the moment arm in the first contact portion, the second friction torque can be made larger than the first friction torque. Therefore, for example, a structure that suppresses transmission of torque from the pressing member to the pipe can be realized with a relatively simple configuration.

  In the pipe connection device, for example, the first contact portion between the pressing portion and the interposed component is conical around the rotation center of the pressing portion, and the second contact between the interposed component and the flange. The portion has a conical shape or a planar shape having a larger apex angle than the first contact portion centered on the rotation center. According to such a configuration, for example, since the vertical drag of the axial force at the second contact portion is larger than the vertical drag of the axial force at the first contact portion, the second friction torque is made larger than the first friction torque. be able to. Therefore, for example, a structure that suppresses transmission of torque from the pressing member to the pipe can be realized with a relatively simple configuration.

FIG. 1 is an exemplary schematic cross-sectional view of a pipe connection device according to an embodiment. FIG. 2 is an exemplary and schematic cross-sectional view of a pipe connection device according to a first modification. FIG. 3 is an exemplary and schematic cross-sectional view of a pipe connection device according to a second modification.

  Hereinafter, exemplary embodiments and modifications of the present invention will be disclosed. The configurations of the embodiments and modified examples shown below, and the operations and results (effects) brought about by the configurations are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments and modifications. According to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by the configuration.

  The following embodiments and modifications include similar components. Therefore, in the following, the same reference numerals are given to the same components, and redundant description may be omitted. Moreover, in this specification, the ordinal number is given for convenience in order to distinguish parts, parts, and the like, and does not indicate priority or order.

  Moreover, in each figure, the direction is shown by the arrow. The arrow X is the direction in which the center line Ax of the pipe 20, the recess 10b, the passage 10a, and the screw mechanism 50 extends.

[Embodiment]
FIG. 1 is a cross-sectional view of the pipe connection device 100. As shown in FIG. 1, the pipe connection device 100 includes a housing 10, a pipe 20, an interposed part 30, and a pressing member 40. In the fluid device, the pipe connection device 100 is configured so that a series of fluid passages in which the passage 10a in the housing 10 and the passage 20a in the pipe 20 are connected to each other are configured in a state where no fluid leaks. The pipe 20 is connected. The housing 10, the pipe 20, the interposed component 30, and the pressing member 40 are made of, for example, a metal material, but at least one of them is made of a material different from a metal material such as a synthetic resin material, for example. Also good. The fluid may be, for example, a liquid such as oil or water, or a gas such as air.

  The housing 10 is provided with a recess 10b. The recess 10b opens to the outside of the housing 10 at an outer opening 10d (opening edge) provided on the outer surface 10c.

  The recess 10b is constituted by an inner surface 10e. The inner surface 10e includes an inner peripheral surface 10e1 and a bottom surface 10e2. The inner peripheral surface 10e1 is a cylindrical inner surface. The bottom surface 10e2 is annular and has a conical outer surface. An inner opening 10f is provided in the ring of the bottom surface 10e2. The passage 10a opens to the recess 10b at the inner opening 10f (opening edge). The inner peripheral surface 10e1, the bottom surface 10e2, and the center line Ax of the passage 10a coincide.

  The end of the pipe 20 is accommodated in the recess 10b. The pipe 20 has a tubular shape, and has a pipe wall 20d having a substantially constant thickness between the outer surface 20b and the inner surface 20c constituting the passage 20a.

  A flange 20e is provided at the distal end of the pipe 20 so as to project outward in the radial direction. The flange 20e is configured in a skirt shape whose diameter increases as it approaches the tip, in other words, in the direction X in FIG. The flange 20e has an outer surface 20e1 and an inner surface 20e2. The outer surface 20e1 is a conical outer surface whose outer diameter increases as it approaches the tip. The inner surface 20e2 is a conical inner surface whose outer diameter decreases as it returns from the tip, in other words, in the direction opposite to the direction X in FIG. The diameter of the inner edge of the inner surface 20e2 is the same as or larger than the diameter of the passages 10a and 20a. The inner surface 20e2 is configured to overlap the bottom surface 10e2 of the recess 10b in the axial direction of the center line Ax. In the assembled state, the inner surface 20e2 is in contact with the bottom surface 10e2. The inner surface 20e2 is an example of a contact end surface. The outer surface 20e1 can also be referred to as a pressure receiving surface, and the inner surface 20e2 can also be referred to as a pressing surface or a tip surface.

  The interposition part 30 is accommodated in the recess 10b. The intervening part 30 has a ring shape and surrounds the periphery of the pipe 20.

  The intervening component 30 has an end surface 30a close to the bottom surface 10e2 and an end surface 30b far from the bottom surface 10e2. The end surface 30 a is a conical inner surface whose outer diameter increases as it approaches the tip of the pipe 20. The end surface 30a is configured to overlap the outer surface 20e1 of the flange 20e in the axial direction of the center line Ax. In the assembled state, the end surface 30a is in contact with the outer surface 20e1 of the flange 20e. The end face 30b is an annular plane. The end surface 30a and the outer surface 20e1 may also be referred to as a second contact surface. The end surface 30a can also be referred to as a pressing surface or a tip surface, and the end surface 30b can also be referred to as a pressure receiving surface.

  The pressing member 40 is fixed to the housing 10 in a state where at least a part of the pressing member 40 is accommodated in the recess 10b. The pressing member 40 has a cylindrical shape and surrounds the periphery of the pipe 20.

  The housing 10 and the pressing member 40 are coupled by a screw mechanism 50 including a female screw 51 and a male screw 52. The female screw 51 is provided on the inner peripheral surface 10 e 1 of the recess 10 b of the housing 10, and the male screw 52 is provided on the outer peripheral surface 41 a of the pressing member 40. The male screw 52 can move in the axial direction of the center line Ax while rotating around the center line Ax in a state of being engaged with the female screw 51. The female screw 51 is an example of a first screw, and the male screw 52 is an example of a second screw. The center line Ax is an example of a rotation center.

  The pressing member 40 has an insertion part 41 inserted into the recess 10b and an exposed part 42 exposed from the recess 10b. The insertion portion 41 is cylindrical, surrounds the pipe 20, and is accommodated in the recess 10b. The end surface 41b of the insertion part 41 is configured to overlap with the end surface 30b of the interposed component 30 in the axial direction of the center line Ax. In the assembled state, the end surface 41b is in contact with the end surface 30b. The end surface 41b is an annular plane. The insertion part 41 is an example of a pressing part. The end surface 41b and the end surface 30b can also be referred to as a first contact surface. The pressing member 40 can also be referred to as a fastening bolt.

  On the outer periphery of the exposed portion 42, for example, two parallel surfaces and six outer surfaces of hexagonal columns are provided, and are configured to fit into a tool such as a spanner or a wrench. The pressing member 40 may have a fitting portion that fits with the special tool.

  In such a configuration, when the exposed portion 42, that is, the pressing member 40 rotates around the center line Ax according to the rotation operation of the tool by an operator, a robot, or the like, the insertion portion 41 rotates due to the engagement between the male screw 52 and the female screw 51. However, it enters into the recess 10b (in the direction X). Then, while the end surface 41b of the insertion part 41 rotates, the end surface 30b of the interposed component 30 is pressed, the end surface 30a of the interposed component 30 presses the outer surface 20e1 of the flange 20e of the pipe 20, and the inner surface 20e2 of the flange 20e is the recessed portion 10b. The bottom surface 10e2 is pressed. By tightening the pressing member 40 with a required tightening torque, the pressing member 40 is fixed to the housing 10 by the frictional resistance between the female screw 51 and the male screw 52 in the screw mechanism 50. At this time, the passage 10a in the housing 10 in a state in which the fluid contact between the inner surface 20e2 and the bottom surface 10e2 is suppressed by the surface contact between the inner surface 20e2 of the flange 20e of the pipe 20 and the bottom surface 10e2 of the recess 10b. And the passage 20a in the pipe 20 are connected. The inner surface 20e2 and the bottom surface 10e2 can also be referred to as sealing surfaces.

  In such a configuration, when the piping 20 rotates by being dragged by the rotation of the pressing member 40 according to the tightening of the pressing member 40, the piping 20 is twisted or the part of the piping 20 away from the housing 10 is different from other parts. There may be inconveniences such as interference. Therefore, in the present embodiment, the interposition component 30 is interposed between the pressing member 40 and the flange 20e, and the transmission of torque from the rotating pressing member 40 to the pipe 20 is suppressed, thereby suppressing the twist of the pipe 20. ing. The interposition component 30 can also be referred to as a slip promoting member.

  Specifically, the pipe connecting device 100 has a first friction torque between the insertion portion 41 and the interposed component 30, in other words, a first friction torque (first friction resistance torque) between the end surface 41b and the end surface 30b. It is comprised so that it may become smaller than the 2nd friction torque between the interposed component 30 and the flange 20e, in other words, the 2nd friction torque (2nd friction resistance torque) between the end surface 30a and the outer surface 20e1.

  In order to achieve such a torque difference, in the present embodiment, the first friction coefficient in the circumferential direction around the center line Ax between the end surface 41b and the end surface 30b is the center line Ax between the end surface 30a and the outer surface 20e1. It is comprised so that it may become smaller than the 2nd friction coefficient of the circumference of the circumference.

Specifically, for example,
(1) Surface properties such as surface roughness are made different between at least one of the end surface 41b and the end surface 30b and at least one of the end surface 30a and the outer surface 20e1.
(2) A hook structure that is caught in the circumferential direction between the end surface 30a and the outer surface 20e1, such as a groove or a protrusion that extends along the radial direction or the axial direction of the rotation center Ax on at least one of the end surface 30a and the outer surface 20e1. A drag structure that drags in the circumferential direction is provided. On the other hand, the end surface 41b and the end surface 30b are not provided with such a hooking structure or a sliding structure. The hook structure and the drag structure are examples of structures that increase the coefficient of friction.
(3) A lubricant such as grease or oil is interposed between the end face 41b and the end face 30b, and a structure for holding a lubricant such as dimples or grooves is provided on at least one of the end face 41b and the end face 30b. The structure in which the lubricant is interposed or the structure that holds the lubricant is an example of a structure that reduces the friction coefficient.
(4) At least one of the end face 41b and the end face 30b is subjected to surface treatment or coating capable of reducing the friction coefficient. Surface treated surfaces and coated layers are examples of structures that reduce the coefficient of friction.

  As described above, in the present embodiment, the pipe connection device 100 has the first friction torque between the insertion portion 41 and the interposed component 30, in other words, the first friction torque between the end surface 41b and the end surface 30b. The second friction torque between the intervening component 30 and the flange 20e, in other words, the second friction torque between the end surface 30a and the outer surface 20e1, is configured to be smaller. According to such a configuration, when the pressing member 40 is tightened, it is possible to prevent the tightening torque from being transmitted to the pipe 20 by sliding between the end surface 41 b and the end surface 30 b. Therefore, for example, the rotation of the pipe 20 with the rotation of the insertion portion 41 (pressing portion) of the pressing member 40 is suppressed.

  In the present embodiment, the first friction coefficient in the circumferential direction around the center line Ax (rotation center) between the end surface 41b and the end surface 30b is the circumferential direction around the center line Ax between the end surface 30a and the outer surface 20e1. It is comprised so that it may become smaller than the 2nd friction coefficient. According to such a configuration, the first friction torque can be made smaller than the second friction torque due to the difference in the friction coefficient. Therefore, according to the present embodiment, for example, a structure that suppresses transmission of torque from the pressing member 40 to the pipe 20 can be realized with a relatively simple configuration.

[First Modification]
FIG. 2 is a cross-sectional view of the pipe connection device 100A of this modification. As shown in FIG. 2, in this modification, an annular protrusion 41 b 1 is provided at the radially inner end of the end surface 41 b of the insertion portion 41, and the end surface of the protrusion 41 b 1 is tightened when the pressing member 40 is tightened. 41b2 and the part which contact | connects end surface 41b2 among the end surfaces 30b of the interposed component 30 are comprised so that it may mutually slide. The portions of the end surface 41b2 and the end surface 30b that are in contact with each other are an example of the first contact portion A1. On the other hand, the second contact portion A2, which is a portion of the end surface 30a of the interposed component 30 and the outer surface 20e1 of the flange 20e that are in contact with each other, is the same as in the first embodiment.

  Moreover, in this modification, as FIG. 2 shows, 2nd contact part A2 has site | part A3 located in the radial direction outer side of centerline Ax (rotation center) rather than 1st contact part A1. doing. Therefore, due to the difference in radius (moment arm) from the center line Ax, the first friction torque due to sliding at the first contact portion A1 is smaller than the second friction torque due to sliding at the second contact portion A2. . Even with such a configuration, when the pressing member 40 is tightened, the sliding between the end surface 41b and the end surface 30b is suppressed, and transmission of the tightening torque to the pipe 20 is suppressed. As a result, the insertion portion 41 (the pressing portion of the pressing member 40) ), The rotation of the pipe 20 is suppressed. Therefore, also by this modification, the structure which suppresses transmission of the torque from the press member 40 to the piping 20 is realizable by a comparatively simple structure, for example.

  The configuration of the present modification is implemented in combination with the configuration for increasing the friction coefficient between the end surface 30a of the interposed component 30 and the outer surface 20e1 of the flange 20e (second contact portion A2) shown in the first embodiment. can do.

[Second Modification]
FIG. 3 is a cross-sectional view of the pipe connection device 100B of this modification. As shown in FIG. 3, in the present modification, the first contact portion A <b> 1 where the end surface 41 b of the insertion portion 41 and the end surface 30 b of the interposed component 30 are in contact is configured in a conical shape. The first contact portion A1 includes a conical inner surface 41b3 provided on the end surface 41b and a conical outer surface 30b1 provided on the end surface 30b. On the other hand, the second contact portion A2, which is a portion of the end surface 30a of the interposed component 30 and the outer surface 20e1 of the flange 20e that are in contact with each other, is the same as in the first embodiment and the first modification.

  Here, in the present modification, as shown in FIG. 3, the apex angle θ2 of the end surface 30a and the outer surface 20e1 is larger than the apex angle θ1 of the conical inner surface 41b3 and the conical outer surface 30b1. Here, the apex angles of the conical surfaces (the conical inner surface and the conical outer surface) are angles formed by the generatrixes in a cross section passing through the center line of the conical surface. When an axial force along the axial direction of the center line Ax acts on the two conical surfaces sliding on each other, the smaller the apex angle of the cone, the component forces N1, N2 (vertical forces in the normal direction of the surface with respect to the axial force F) Drag) becomes smaller (N1 <N2), and consequently the friction torque becomes smaller. Therefore, the first friction torque caused by the sliding at the first contact portion A1 is smaller than the second friction torque caused by the sliding at the second contact portion A2 because the vertex angle θ1 is smaller than the vertex angle θ2. Even with such a configuration, when the pressing member 40 is tightened, the sliding between the end surface 41b and the end surface 30b is suppressed, and transmission of the tightening torque to the pipe 20 is suppressed. As a result, the insertion portion 41 (the pressing portion of the pressing member 40) ), The rotation of the pipe 20 is suppressed. Therefore, also by this modification, the structure which suppresses transmission of the torque from the press member 40 to the piping 20 is realizable by a comparatively simple structure, for example. In addition, although the cone in 1st contact part A1 is sharpened toward the direction opposite to the direction X in FIG. 3, it is not limited to this, You may sharpen toward the direction X in FIG. In the present modification, the first contact portion A1 is provided at the radially inner end portions of the insertion portion 41 and the interposed component 30, but the radially outer end portions of the insertion portion 41 and the interposed component 30. May be provided. Further, the second contact portion A2, that is, the end surface 30a of the interposed component 30 and the outer surface 20e1 of the flange 20e may be an annular flat surface instead of a conical surface.

  Note that the configuration of the present modification can be implemented in combination with the configuration shown in the first embodiment.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example and is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. In addition, specifications (structure, type, direction, form, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration, shape, etc. are changed as appropriate. Can be implemented.

  For example, the housing may be provided with a male screw as a first screw, and the pressing member may be provided with a female screw as a second screw. Further, the pipe connecting device can be implemented after appropriately changing the shape and configuration of the flange of the pipe, the shape of the bottom surface of the concave portion of the housing, and the like.

  DESCRIPTION OF SYMBOLS 10 ... Housing, 10b ... Concave part, 10d ... Outer opening, 10e ... Inner surface, 10e1 ... Inner peripheral surface, 10e2 ... Bottom surface, 10f ... Inner opening, 20 ... Pipe, 20e ... Flange, 20e1 ... Outer surface, 20e2 ... Inner surface (contact end surface ), 30 ... interposed parts, 30a ... end face, 30b ... end face, 40 ... pressing member, 41 ... insertion part (pressing part), 41b ... end face, 51 ... female screw (first screw), 52 ... male screw (second screw) , 100, 100A, 100B ... pipe connection device, A1 ... first contact portion, A2 ... second contact portion, Ax ... center line (rotation center).

Claims (4)

A recess provided with an inner surface including an inner peripheral surface and a bottom surface surrounding the inner opening, the housing having a first screw;
A pipe having a flange housed in the recess and projecting radially outward, and a contact end surface located at an end in the longitudinal direction and in contact with the bottom surface;
An intervening part that is accommodated in the recess and surrounds the pipe, and that is in contact with the flange on the side opposite to the bottom surface;
A second screw meshing with the first screw; and a flange configured to be inserted into the recess while rotating around the piping in accordance with the rotation of the second screw surrounding the piping and meshing with the first screw; Is a pressing member having a pressing part in contact with the interposition part on the opposite side,
With
In the case where the intermediate part is pressed while the pressing part rotates, a first friction torque between the pressing part and the intermediate part is smaller than a second friction torque between the intermediate part and the flange. , Piping connection equipment.   The first friction coefficient in the circumferential direction of the rotation center of the pressing part between the pressing part and the interposed part is smaller than the second friction coefficient in the circumferential direction between the interposed part and the flange. Item 2. The pipe connection device according to item 1.   The second contact portion between the interposed component and the flange has a portion located radially outward of the rotation center of the pressing portion with respect to the first contact portion between the pressing portion and the interposed component. Item 3. The pipe connection device according to item 1 or 2.   The first contact part between the pressing part and the interposed part is conical around the rotation center of the pressing part, and the second contact part between the intermediate part and the flange is centered around the rotation center. The pipe connection device according to any one of claims 1 to 3, wherein the pipe connection device has a conical shape or a planar shape having a larger apex angle than the first contact portion.

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